Google Git
Sign in
android / platform / frameworks / base / f1e484acb594a726fb57ad0ae4cfe902c7f35858 / . / core / java / android / widget / AbsListView.java
blob: 19ec77d89a6077ee69f5bb5eb010f87e3b3bce5a [file] [log] [blame]
/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Debug;
import android.os.Handler;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.WindowManagerImpl;
import android.view.ContextMenu.ContextMenuInfo;
import com.android.internal.R;
import java.util.ArrayList;
import java.util.List;
/**
* Common code shared between ListView and GridView
*
* @attr ref android.R.styleable#AbsListView_listSelector
* @attr ref android.R.styleable#AbsListView_drawSelectorOnTop
* @attr ref android.R.styleable#AbsListView_stackFromBottom
* @attr ref android.R.styleable#AbsListView_scrollingCache
* @attr ref android.R.styleable#AbsListView_textFilterEnabled
* @attr ref android.R.styleable#AbsListView_transcriptMode
* @attr ref android.R.styleable#AbsListView_cacheColorHint
* @attr ref android.R.styleable#AbsListView_fastScrollEnabled
* @attr ref android.R.styleable#AbsListView_smoothScrollbar
*/
public abstract class AbsListView extends AdapterView<ListAdapter> implements TextWatcher,
ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener,
ViewTreeObserver.OnTouchModeChangeListener {
/**
* Disables the transcript mode.
*
* @see #setTranscriptMode(int)
*/
public static final int TRANSCRIPT_MODE_DISABLED = 0;
/**
* The list will automatically scroll to the bottom when a data set change
* notification is received and only if the last item is already visible
* on screen.
*
* @see #setTranscriptMode(int)
*/
public static final int TRANSCRIPT_MODE_NORMAL = 1;
/**
* The list will automatically scroll to the bottom, no matter what items
* are currently visible.
*
* @see #setTranscriptMode(int)
*/
public static final int TRANSCRIPT_MODE_ALWAYS_SCROLL = 2;
/**
* Indicates that we are not in the middle of a touch gesture
*/
static final int TOUCH_MODE_REST = -1;
/**
* Indicates we just received the touch event and we are waiting to see if the it is a tap or a
* scroll gesture.
*/
static final int TOUCH_MODE_DOWN = 0;
/**
* Indicates the touch has been recognized as a tap and we are now waiting to see if the touch
* is a longpress
*/
static final int TOUCH_MODE_TAP = 1;
/**
* Indicates we have waited for everything we can wait for, but the user's finger is still down
*/
static final int TOUCH_MODE_DONE_WAITING = 2;
/**
* Indicates the touch gesture is a scroll
*/
static final int TOUCH_MODE_SCROLL = 3;
/**
* Indicates the view is in the process of being flung
*/
static final int TOUCH_MODE_FLING = 4;
/**
* Indicates that the user is currently dragging the fast scroll thumb
*/
static final int TOUCH_MODE_FAST_SCROLL = 5;
/**
* Regular layout - usually an unsolicited layout from the view system
*/
static final int LAYOUT_NORMAL = 0;
/**
* Show the first item
*/
static final int LAYOUT_FORCE_TOP = 1;
/**
* Force the selected item to be on somewhere on the screen
*/
static final int LAYOUT_SET_SELECTION = 2;
/**
* Show the last item
*/
static final int LAYOUT_FORCE_BOTTOM = 3;
/**
* Make a mSelectedItem appear in a specific location and build the rest of
* the views from there. The top is specified by mSpecificTop.
*/
static final int LAYOUT_SPECIFIC = 4;
/**
* Layout to sync as a result of a data change. Restore mSyncPosition to have its top
* at mSpecificTop
*/
static final int LAYOUT_SYNC = 5;
/**
* Layout as a result of using the navigation keys
*/
static final int LAYOUT_MOVE_SELECTION = 6;
/**
* Controls how the next layout will happen
*/
int mLayoutMode = LAYOUT_NORMAL;
/**
* Should be used by subclasses to listen to changes in the dataset
*/
AdapterDataSetObserver mDataSetObserver;
/**
* The adapter containing the data to be displayed by this view
*/
ListAdapter mAdapter;
/**
* Indicates whether the list selector should be drawn on top of the children or behind
*/
boolean mDrawSelectorOnTop = false;
/**
* The drawable used to draw the selector
*/
Drawable mSelector;
/**
* Defines the selector's location and dimension at drawing time
*/
Rect mSelectorRect = new Rect();
/**
* The data set used to store unused views that should be reused during the next layout
* to avoid creating new ones
*/
final RecycleBin mRecycler = new RecycleBin();
/**
* The selection's left padding
*/
int mSelectionLeftPadding = 0;
/**
* The selection's top padding
*/
int mSelectionTopPadding = 0;
/**
* The selection's right padding
*/
int mSelectionRightPadding = 0;
/**
* The selection's bottom padding
*/
int mSelectionBottomPadding = 0;
/**
* This view's padding
*/
Rect mListPadding = new Rect();
/**
* Subclasses must retain their measure spec from onMeasure() into this member
*/
int mWidthMeasureSpec = 0;
/**
* The top scroll indicator
*/
View mScrollUp;
/**
* The down scroll indicator
*/
View mScrollDown;
/**
* When the view is scrolling, this flag is set to true to indicate subclasses that
* the drawing cache was enabled on the children
*/
boolean mCachingStarted;
/**
* The position of the view that received the down motion event
*/
int mMotionPosition;
/**
* The offset to the top of the mMotionPosition view when the down motion event was received
*/
int mMotionViewOriginalTop;
/**
* The desired offset to the top of the mMotionPosition view after a scroll
*/
int mMotionViewNewTop;
/**
* The X value associated with the the down motion event
*/
int mMotionX;
/**
* The Y value associated with the the down motion event
*/
int mMotionY;
/**
* One of TOUCH_MODE_REST, TOUCH_MODE_DOWN, TOUCH_MODE_TAP, TOUCH_MODE_SCROLL, or
* TOUCH_MODE_DONE_WAITING
*/
int mTouchMode = TOUCH_MODE_REST;
/**
* Y value from on the previous motion event (if any)
*/
int mLastY;
/**
* How far the finger moved before we started scrolling
*/
int mMotionCorrection;
/**
* Determines speed during touch scrolling
*/
private VelocityTracker mVelocityTracker;
/**
* Handles one frame of a fling
*/
private FlingRunnable mFlingRunnable;
/**
* The offset in pixels form the top of the AdapterView to the top
* of the currently selected view. Used to save and restore state.
*/
int mSelectedTop = 0;
/**
* Indicates whether the list is stacked from the bottom edge or
* the top edge.
*/
boolean mStackFromBottom;
/**
* When set to true, the list automatically discards the children's
* bitmap cache after scrolling.
*/
boolean mScrollingCacheEnabled;
/**
* Whether or not to enable the fast scroll feature on this list
*/
boolean mFastScrollEnabled;
/**
* Optional callback to notify client when scroll position has changed
*/
private OnScrollListener mOnScrollListener;
/**
* Keeps track of our accessory window
*/
PopupWindow mPopup;
/**
* Used with type filter window
*/
EditText mTextFilter;
/**
* Indicates whether to use pixels-based or position-based scrollbar
* properties.
*/
private boolean mSmoothScrollbarEnabled = true;
/**
* Indicates that this view supports filtering
*/
private boolean mTextFilterEnabled;
/**
* Indicates that this view is currently displaying a filtered view of the data
*/
private boolean mFiltered;
/**
* Rectangle used for hit testing children
*/
private Rect mTouchFrame;
/**
* The position to resurrect the selected position to.
*/
int mResurrectToPosition = INVALID_POSITION;
private ContextMenuInfo mContextMenuInfo = null;
/**
* Used to request a layout when we changed touch mode
*/
private static final int TOUCH_MODE_UNKNOWN = -1;
private static final int TOUCH_MODE_ON = 0;
private static final int TOUCH_MODE_OFF = 1;
private int mLastTouchMode = TOUCH_MODE_UNKNOWN;
// TODO: REMOVE WHEN WE'RE DONE WITH PROFILING
private static final boolean PROFILE_SCROLLING = false;
private boolean mScrollProfilingStarted = false;
private static final boolean PROFILE_FLINGING = false;
private boolean mFlingProfilingStarted = false;
/**
* The last CheckForLongPress runnable we posted, if any
*/
private CheckForLongPress mPendingCheckForLongPress;
/**
* The last CheckForTap runnable we posted, if any
*/
private Runnable mPendingCheckForTap;
/**
* The last CheckForKeyLongPress runnable we posted, if any
*/
private CheckForKeyLongPress mPendingCheckForKeyLongPress;
/**
* Acts upon click
*/
private AbsListView.PerformClick mPerformClick;
/**
* This view is in transcript mode -- it shows the bottom of the list when the data
* changes
*/
private int mTranscriptMode;
/**
* Indicates that this list is always drawn on top of a solid, single-color, opaque
* background
*/
private int mCacheColorHint;
/**
* The select child's view (from the adapter's getView) is enabled.
*/
private boolean mIsChildViewEnabled;
/**
* The last scroll state reported to clients through {@link OnScrollListener}.
*/
private int mLastScrollState = OnScrollListener.SCROLL_STATE_IDLE;
/**
* Helper object that renders and controls the fast scroll thumb.
*/
private FastScroller mFastScroller;
/**
* Interface definition for a callback to be invoked when the list or grid
* has been scrolled.
*/
public interface OnScrollListener {
/**
* The view is not scrolling. Note navigating the list using the trackball counts as
* being in the idle state since these transitions are not animated.
*/
public static int SCROLL_STATE_IDLE = 0;
/**
* The user is scrolling using touch, and their finger is still on the screen
*/
public static int SCROLL_STATE_TOUCH_SCROLL = 1;
/**
* The user had previously been scrolling using touch and had performed a fling. The
* animation is now coasting to a stop
*/
public static int SCROLL_STATE_FLING = 2;
/**
* Callback method to be invoked while the list view or grid view is being scrolled. If the
* view is being scrolled, this method will be called before the next frame of the scroll is
* rendered. In particular, it will be called before any calls to
* {@link Adapter#getView(int, View, ViewGroup)}.
*
* @param view The view whose scroll state is being reported
*
* @param scrollState The current scroll state. One of {@link #SCROLL_STATE_IDLE},
* {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}.
*/
public void onScrollStateChanged(AbsListView view, int scrollState);
/**
* Callback method to be invoked when the list or grid has been scrolled. This will be
* called after the scroll has completed
* @param view The view whose scroll state is being reported
* @param firstVisibleItem the index of the first visible cell (ignore if
* visibleItemCount == 0)
* @param visibleItemCount the number of visible cells
* @param totalItemCount the number of items in the list adaptor
*/
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
int totalItemCount);
}
public AbsListView(Context context) {
super(context);
initAbsListView();
setVerticalScrollBarEnabled(true);
TypedArray a = context.obtainStyledAttributes(R.styleable.View);
initializeScrollbars(a);
a.recycle();
}
public AbsListView(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.absListViewStyle);
}
public AbsListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initAbsListView();
TypedArray a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.AbsListView, defStyle, 0);
Drawable d = a.getDrawable(com.android.internal.R.styleable.AbsListView_listSelector);
if (d != null) {
setSelector(d);
}
mDrawSelectorOnTop = a.getBoolean(
com.android.internal.R.styleable.AbsListView_drawSelectorOnTop, false);
boolean stackFromBottom = a.getBoolean(R.styleable.AbsListView_stackFromBottom, false);
setStackFromBottom(stackFromBottom);
boolean scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, true);
setScrollingCacheEnabled(scrollingCacheEnabled);
boolean useTextFilter = a.getBoolean(R.styleable.AbsListView_textFilterEnabled, false);
setTextFilterEnabled(useTextFilter);
int transcriptMode = a.getInt(R.styleable.AbsListView_transcriptMode,
TRANSCRIPT_MODE_DISABLED);
setTranscriptMode(transcriptMode);
int color = a.getColor(R.styleable.AbsListView_cacheColorHint, 0);
setCacheColorHint(color);
boolean enableFastScroll = a.getBoolean(R.styleable.AbsListView_fastScrollEnabled, false);
setFastScrollEnabled(enableFastScroll);
boolean smoothScrollbar = a.getBoolean(R.styleable.AbsListView_smoothScrollbar, true);
setSmoothScrollbarEnabled(smoothScrollbar);
a.recycle();
}
/**
* Enables fast scrolling by letting the user quickly scroll through lists by
* dragging the fast scroll thumb. The adapter attached to the list may want
* to implement {@link SectionIndexer} if it wishes to display alphabet preview and
* jump between sections of the list.
* @see SectionIndexer
* @see #isFastScrollEnabled()
* @param enabled whether or not to enable fast scrolling
*/
public void setFastScrollEnabled(boolean enabled) {
mFastScrollEnabled = enabled;
if (enabled) {
if (mFastScroller == null) {
mFastScroller = new FastScroller(getContext(), this);
}
} else {
if (mFastScroller != null) {
mFastScroller.stop();
mFastScroller = null;
}
}
}
/**
* Returns the current state of the fast scroll feature.
* @see #setFastScrollEnabled(boolean)
* @return true if fast scroll is enabled, false otherwise
*/
@ViewDebug.ExportedProperty
public boolean isFastScrollEnabled() {
return mFastScrollEnabled;
}
/**
* When smooth scrollbar is enabled, the position and size of the scrollbar thumb
* is computed based on the number of visible pixels in the visible items. This
* however assumes that all list items have the same height. If you use a list in
* which items have different heights, the scrollbar will change appearance as the
* user scrolls through the list. To avoid this issue, you need to disable this
* property.
*
* When smooth scrollbar is disabled, the position and size of the scrollbar thumb
* is based solely on the number of items in the adapter and the position of the
* visible items inside the adapter. This provides a stable scrollbar as the user
* navigates through a list of items with varying heights.
*
* @param enabled Whether or not to enable smooth scrollbar.
*
* @see #setSmoothScrollbarEnabled(boolean)
* @attr ref android.R.styleable#AbsListView_smoothScrollbar
*/
public void setSmoothScrollbarEnabled(boolean enabled) {
mSmoothScrollbarEnabled = enabled;
}
/**
* Returns the current state of the fast scroll feature.
*
* @return True if smooth scrollbar is enabled is enabled, false otherwise.
*
* @see #setSmoothScrollbarEnabled(boolean)
*/
@ViewDebug.ExportedProperty
public boolean isSmoothScrollbarEnabled() {
return mSmoothScrollbarEnabled;
}
/**
* Set the listener that will receive notifications every time the list scrolls.
*
* @param l the scroll listener
*/
public void setOnScrollListener(OnScrollListener l) {
mOnScrollListener = l;
invokeOnItemScrollListener();
}
/**
* Notify our scroll listener (if there is one) of a change in scroll state
*/
void invokeOnItemScrollListener() {
if (mFastScroller != null) {
mFastScroller.onScroll(this, mFirstPosition, getChildCount(), mItemCount);
}
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(this, mFirstPosition, getChildCount(), mItemCount);
}
}
/**
* Indicates whether the children's drawing cache is used during a scroll.
* By default, the drawing cache is enabled but this will consume more memory.
*
* @return true if the scrolling cache is enabled, false otherwise
*
* @see #setScrollingCacheEnabled(boolean)
* @see View#setDrawingCacheEnabled(boolean)
*/
@ViewDebug.ExportedProperty
public boolean isScrollingCacheEnabled() {
return mScrollingCacheEnabled;
}
/**
* Enables or disables the children's drawing cache during a scroll.
* By default, the drawing cache is enabled but this will use more memory.
*
* When the scrolling cache is enabled, the caches are kept after the
* first scrolling. You can manually clear the cache by calling
* {@link android.view.ViewGroup#setChildrenDrawingCacheEnabled(boolean)}.
*
* @param enabled true to enable the scroll cache, false otherwise
*
* @see #isScrollingCacheEnabled()
* @see View#setDrawingCacheEnabled(boolean)
*/
public void setScrollingCacheEnabled(boolean enabled) {
if (mScrollingCacheEnabled && !enabled) {
clearScrollingCache();
}
mScrollingCacheEnabled = enabled;
}
/**
* Enables or disables the type filter window. If enabled, typing when
* this view has focus will filter the children to match the users input.
* Note that the {@link Adapter} used by this view must implement the
* {@link Filterable} interface.
*
* @param textFilterEnabled true to enable type filtering, false otherwise
*
* @see Filterable
*/
public void setTextFilterEnabled(boolean textFilterEnabled) {
mTextFilterEnabled = textFilterEnabled;
}
/**
* Indicates whether type filtering is enabled for this view
*
* @return true if type filtering is enabled, false otherwise
*
* @see #setTextFilterEnabled(boolean)
* @see Filterable
*/
@ViewDebug.ExportedProperty
public boolean isTextFilterEnabled() {
return mTextFilterEnabled;
}
@Override
public void getFocusedRect(Rect r) {
View view = getSelectedView();
if (view != null) {
// the focused rectangle of the selected view offset into the
// coordinate space of this view.
view.getFocusedRect(r);
offsetDescendantRectToMyCoords(view, r);
} else {
// otherwise, just the norm
super.getFocusedRect(r);
}
}
private void initAbsListView() {
// Setting focusable in touch mode will set the focusable property to true
setFocusableInTouchMode(true);
setWillNotDraw(false);
setAlwaysDrawnWithCacheEnabled(false);
setScrollingCacheEnabled(true);
}
private void useDefaultSelector() {
setSelector(getResources().getDrawable(
com.android.internal.R.drawable.list_selector_background));
}
/**
* Indicates whether the content of this view is pinned to, or stacked from,
* the bottom edge.
*
* @return true if the content is stacked from the bottom edge, false otherwise
*/
@ViewDebug.ExportedProperty
public boolean isStackFromBottom() {
return mStackFromBottom;
}
/**
* When stack from bottom is set to true, the list fills its content starting from
* the bottom of the view.
*
* @param stackFromBottom true to pin the view's content to the bottom edge,
* false to pin the view's content to the top edge
*/
public void setStackFromBottom(boolean stackFromBottom) {
if (mStackFromBottom != stackFromBottom) {
mStackFromBottom = stackFromBottom;
requestLayoutIfNecessary();
}
}
void requestLayoutIfNecessary() {
if (getChildCount() > 0) {
resetList();
requestLayout();
invalidate();
}
}
static class SavedState extends BaseSavedState {
long selectedId;
long firstId;
int viewTop;
int position;
int height;
String filter;
/**
* Constructor called from {@link AbsListView#onSaveInstanceState()}
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Constructor called from {@link #CREATOR}
*/
private SavedState(Parcel in) {
super(in);
selectedId = in.readLong();
firstId = in.readLong();
viewTop = in.readInt();
position = in.readInt();
height = in.readInt();
filter = in.readString();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeLong(selectedId);
out.writeLong(firstId);
out.writeInt(viewTop);
out.writeInt(position);
out.writeInt(height);
out.writeString(filter);
}
@Override
public String toString() {
return "AbsListView.SavedState{"
+ Integer.toHexString(System.identityHashCode(this))
+ " selectedId=" + selectedId
+ " firstId=" + firstId
+ " viewTop=" + viewTop
+ " position=" + position
+ " height=" + height
+ " filter=" + filter + "}";
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
@Override
public Parcelable onSaveInstanceState() {
/*
* This doesn't really make sense as the place to dismiss the
* popup, but there don't seem to be any other useful hooks
* that happen early enough to keep from getting complaints
* about having leaked the window.
*/
dismissPopup();
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
boolean haveChildren = getChildCount() > 0;
long selectedId = getSelectedItemId();
ss.selectedId = selectedId;
ss.height = getHeight();
if (selectedId >= 0) {
// Remember the selection
ss.viewTop = mSelectedTop;
ss.position = getSelectedItemPosition();
ss.firstId = INVALID_POSITION;
} else {
if (haveChildren) {
// Remember the position of the first child
View v = getChildAt(0);
ss.viewTop = v.getTop();
ss.position = mFirstPosition;
ss.firstId = mAdapter.getItemId(mFirstPosition);
} else {
ss.viewTop = 0;
ss.firstId = INVALID_POSITION;
ss.position = 0;
}
}
ss.filter = null;
if (mFiltered) {
final EditText textFilter = mTextFilter;
if (textFilter != null) {
Editable filterText = textFilter.getText();
if (filterText != null) {
ss.filter = filterText.toString();
}
}
}
return ss;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
mDataChanged = true;
mSyncHeight = ss.height;
if (ss.selectedId >= 0) {
mNeedSync = true;
mSyncRowId = ss.selectedId;
mSyncPosition = ss.position;
mSpecificTop = ss.viewTop;
mSyncMode = SYNC_SELECTED_POSITION;
} else if (ss.firstId >= 0) {
setSelectedPositionInt(INVALID_POSITION);
// Do this before setting mNeedSync since setNextSelectedPosition looks at mNeedSync
setNextSelectedPositionInt(INVALID_POSITION);
mNeedSync = true;
mSyncRowId = ss.firstId;
mSyncPosition = ss.position;
mSpecificTop = ss.viewTop;
mSyncMode = SYNC_FIRST_POSITION;
}
// Don't restore the type filter window when there is no keyboard
int keyboardHidden = getContext().getResources().getConfiguration().keyboardHidden;
if (keyboardHidden != Configuration.KEYBOARDHIDDEN_YES) {
String filterText = ss.filter;
setFilterText(filterText);
}
requestLayout();
}
/**
* Sets the initial value for the text filter.
* @param filterText The text to use for the filter.
*
* @see #setTextFilterEnabled
*/
public void setFilterText(String filterText) {
if (mTextFilterEnabled && filterText != null && filterText.length() > 0) {
createTextFilter(false);
// This is going to call our listener onTextChanged, but we might not
// be ready to bring up a window yet
mTextFilter.setText(filterText);
mTextFilter.setSelection(filterText.length());
if (mAdapter instanceof Filterable) {
// if mPopup is non-null, then onTextChanged will do the filtering
if (mPopup == null) {
Filter f = ((Filterable) mAdapter).getFilter();
f.filter(filterText);
}
// Set filtered to true so we will display the filter window when our main
// window is ready
mFiltered = true;
mDataSetObserver.clearSavedState();
}
}
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) {
resurrectSelection();
}
}
@Override
public void requestLayout() {
if (!mBlockLayoutRequests && !mInLayout) {
super.requestLayout();
}
}
/**
* The list is empty. Clear everything out.
*/
void resetList() {
removeAllViewsInLayout();
mFirstPosition = 0;
mDataChanged = false;
mNeedSync = false;
mOldSelectedPosition = INVALID_POSITION;
mOldSelectedRowId = INVALID_ROW_ID;
setSelectedPositionInt(INVALID_POSITION);
setNextSelectedPositionInt(INVALID_POSITION);
mSelectedTop = 0;
mSelectorRect.setEmpty();
invalidate();
}
@Override
protected int computeVerticalScrollExtent() {
final int count = getChildCount();
if (count > 0) {
if (mSmoothScrollbarEnabled) {
int extent = count * 100;
View view = getChildAt(0);
final int top = view.getTop();
int height = view.getHeight();
if (height > 0) {
extent += (top * 100) / height;
}
view = getChildAt(count - 1);
final int bottom = view.getBottom();
height = view.getHeight();
if (height > 0) {
extent -= ((bottom - getHeight()) * 100) / height;
}
return extent;
} else {
return 1;
}
}
return 0;
}
@Override
protected int computeVerticalScrollOffset() {
final int firstPosition = mFirstPosition;
final int childCount = getChildCount();
if (firstPosition >= 0 && childCount > 0) {
if (mSmoothScrollbarEnabled) {
final View view = getChildAt(0);
final int top = view.getTop();
int height = view.getHeight();
if (height > 0) {
return Math.max(firstPosition * 100 - (top * 100) / height, 0);
}
} else {
int index;
final int count = mItemCount;
if (firstPosition == 0) {
index = 0;
} else if (firstPosition + childCount == count) {
index = count;
} else {
index = firstPosition + childCount / 2;
}
return (int) (firstPosition + childCount * (index / (float) count));
}
}
return 0;
}
@Override
protected int computeVerticalScrollRange() {
return mSmoothScrollbarEnabled ? Math.max(mItemCount * 100, 0) : mItemCount;
}
@Override
protected float getTopFadingEdgeStrength() {
final int count = getChildCount();
final float fadeEdge = super.getTopFadingEdgeStrength();
if (count == 0) {
return fadeEdge;
} else {
if (mFirstPosition > 0) {
return 1.0f;
}
final int top = getChildAt(0).getTop();
final float fadeLength = (float) getVerticalFadingEdgeLength();
return top < mPaddingTop ? (float) -(top - mPaddingTop) / fadeLength : fadeEdge;
}
}
@Override
protected float getBottomFadingEdgeStrength() {
final int count = getChildCount();
final float fadeEdge = super.getBottomFadingEdgeStrength();
if (count == 0) {
return fadeEdge;
} else {
if (mFirstPosition + count - 1 < mItemCount - 1) {
return 1.0f;
}
final int bottom = getChildAt(count - 1).getBottom();
final int height = getHeight();
final float fadeLength = (float) getVerticalFadingEdgeLength();
return bottom > height - mPaddingBottom ?
(float) (bottom - height + mPaddingBottom) / fadeLength : fadeEdge;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mSelector == null) {
useDefaultSelector();
}
final Rect listPadding = mListPadding;
listPadding.left = mSelectionLeftPadding + mPaddingLeft;
listPadding.top = mSelectionTopPadding + mPaddingTop;
listPadding.right = mSelectionRightPadding + mPaddingRight;
listPadding.bottom = mSelectionBottomPadding + mPaddingBottom;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
mInLayout = true;
layoutChildren();
mInLayout = false;
}
protected void layoutChildren() {
}
void updateScrollIndicators() {
if (mScrollUp != null) {
boolean canScrollUp;
// 0th element is not visible
canScrollUp = mFirstPosition > 0;
// ... Or top of 0th element is not visible
if (!canScrollUp) {
if (getChildCount() > 0) {
View child = getChildAt(0);
canScrollUp = child.getTop() < mListPadding.top;
}
}
mScrollUp.setVisibility(canScrollUp ? View.VISIBLE : View.INVISIBLE);
}
if (mScrollDown != null) {
boolean canScrollDown;
int count = getChildCount();
// Last item is not visible
canScrollDown = (mFirstPosition + count) < mItemCount;
// ... Or bottom of the last element is not visible
if (!canScrollDown && count > 0) {
View child = getChildAt(count - 1);
canScrollDown = child.getBottom() > mBottom - mListPadding.bottom;
}
mScrollDown.setVisibility(canScrollDown ? View.VISIBLE : View.INVISIBLE);
}
}
@Override
@ViewDebug.ExportedProperty
public View getSelectedView() {
if (mItemCount > 0 && mSelectedPosition >= 0) {
return getChildAt(mSelectedPosition - mFirstPosition);
} else {
return null;
}
}
/**
* List padding is the maximum of the normal view's padding and the padding of the selector.
*
* @see android.view.View#getPaddingTop()
* @see #getSelector()
*
* @return The top list padding.
*/
public int getListPaddingTop() {
return mListPadding.top;
}
/**
* List padding is the maximum of the normal view's padding and the padding of the selector.
*
* @see android.view.View#getPaddingBottom()
* @see #getSelector()
*
* @return The bottom list padding.
*/
public int getListPaddingBottom() {
return mListPadding.bottom;
}
/**
* List padding is the maximum of the normal view's padding and the padding of the selector.
*
* @see android.view.View#getPaddingLeft()
* @see #getSelector()
*
* @return The left list padding.
*/
public int getListPaddingLeft() {
return mListPadding.left;
}
/**
* List padding is the maximum of the normal view's padding and the padding of the selector.
*
* @see android.view.View#getPaddingRight()
* @see #getSelector()
*
* @return The right list padding.
*/
public int getListPaddingRight() {
return mListPadding.right;
}
/**
* Get a view and have it show the data associated with the specified
* position. This is called when we have already discovered that the view is
* not available for reuse in the recycle bin. The only choices left are
* converting an old view or making a new one.
*
* @param position The position to display
* @return A view displaying the data associated with the specified position
*/
View obtainView(int position) {
View scrapView;
scrapView = mRecycler.getScrapView(position);
View child;
if (scrapView != null) {
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(scrapView, ViewDebug.RecyclerTraceType.RECYCLE_FROM_SCRAP_HEAP,
position, -1);
}
child = mAdapter.getView(position, scrapView, this);
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(child, ViewDebug.RecyclerTraceType.BIND_VIEW,
position, getChildCount());
}
if (child != scrapView) {
mRecycler.addScrapView(scrapView);
if (mCacheColorHint != 0) {
child.setDrawingCacheBackgroundColor(mCacheColorHint);
}
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(scrapView, ViewDebug.RecyclerTraceType.MOVE_TO_SCRAP_HEAP,
position, -1);
}
}
} else {
child = mAdapter.getView(position, null, this);
if (mCacheColorHint != 0) {
child.setDrawingCacheBackgroundColor(mCacheColorHint);
}
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(child, ViewDebug.RecyclerTraceType.NEW_VIEW,
position, getChildCount());
}
}
return child;
}
void positionSelector(View sel) {
final Rect selectorRect = mSelectorRect;
selectorRect.set(sel.getLeft(), sel.getTop(), sel.getRight(), sel.getBottom());
positionSelector(selectorRect.left, selectorRect.top, selectorRect.right,
selectorRect.bottom);
final boolean isChildViewEnabled = mIsChildViewEnabled;
if (sel.isEnabled() != isChildViewEnabled) {
mIsChildViewEnabled = !isChildViewEnabled;
refreshDrawableState();
}
}
private void positionSelector(int l, int t, int r, int b) {
mSelectorRect.set(l - mSelectionLeftPadding, t - mSelectionTopPadding, r
+ mSelectionRightPadding, b + mSelectionBottomPadding);
}
@Override
protected void dispatchDraw(Canvas canvas) {
int saveCount = 0;
final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
if (clipToPadding) {
saveCount = canvas.save();
final int scrollX = mScrollX;
final int scrollY = mScrollY;
canvas.clipRect(scrollX + mPaddingLeft, scrollY + mPaddingTop,
scrollX + mRight - mLeft - mPaddingRight,
scrollY + mBottom - mTop - mPaddingBottom);
mGroupFlags &= ~CLIP_TO_PADDING_MASK;
}
final boolean drawSelectorOnTop = mDrawSelectorOnTop;
if (!drawSelectorOnTop) {
drawSelector(canvas);
}
super.dispatchDraw(canvas);
if (drawSelectorOnTop) {
drawSelector(canvas);
}
if (clipToPadding) {
canvas.restoreToCount(saveCount);
mGroupFlags |= CLIP_TO_PADDING_MASK;
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (getChildCount() > 0) {
mDataChanged = true;
rememberSyncState();
}
if (mFastScroller != null) {
mFastScroller.onSizeChanged(w, h, oldw, oldh);
}
}
/**
* @return True if the current touch mode requires that we draw the selector in the pressed
* state.
*/
boolean touchModeDrawsInPressedState() {
// FIXME use isPressed for this
switch (mTouchMode) {
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
return true;
default:
return false;
}
}
/**
* Indicates whether this view is in a state where the selector should be drawn. This will
* happen if we have focus but are not in touch mode, or we are in the middle of displaying
* the pressed state for an item.
*
* @return True if the selector should be shown
*/
boolean shouldShowSelector() {
return (hasFocus() && !isInTouchMode()) || touchModeDrawsInPressedState();
}
private void drawSelector(Canvas canvas) {
if (shouldShowSelector() && mSelectorRect != null && !mSelectorRect.isEmpty()) {
final Drawable selector = mSelector;
selector.setBounds(mSelectorRect);
selector.draw(canvas);
}
}
/**
* Controls whether the selection highlight drawable should be drawn on top of the item or
* behind it.
*
* @param onTop If true, the selector will be drawn on the item it is highlighting. The default
* is false.
*
* @attr ref android.R.styleable#AbsListView_drawSelectorOnTop
*/
public void setDrawSelectorOnTop(boolean onTop) {
mDrawSelectorOnTop = onTop;
}
/**
* Set a Drawable that should be used to highlight the currently selected item.
*
* @param resID A Drawable resource to use as the selection highlight.
*
* @attr ref android.R.styleable#AbsListView_listSelector
*/
public void setSelector(int resID) {
setSelector(getResources().getDrawable(resID));
}
public void setSelector(Drawable sel) {
if (mSelector != null) {
mSelector.setCallback(null);
unscheduleDrawable(mSelector);
}
mSelector = sel;
Rect padding = new Rect();
sel.getPadding(padding);
mSelectionLeftPadding = padding.left;
mSelectionTopPadding = padding.top;
mSelectionRightPadding = padding.right;
mSelectionBottomPadding = padding.bottom;
sel.setCallback(this);
sel.setState(getDrawableState());
}
/**
* Returns the selector {@link android.graphics.drawable.Drawable} that is used to draw the
* selection in the list.
*
* @return the drawable used to display the selector
*/
public Drawable getSelector() {
return mSelector;
}
/**
* Sets the selector state to "pressed" and posts a CheckForKeyLongPress to see if
* this is a long press.
*/
void keyPressed() {
Drawable selector = mSelector;
Rect selectorRect = mSelectorRect;
if (selector != null && (isFocused() || touchModeDrawsInPressedState())
&& selectorRect != null && !selectorRect.isEmpty()) {
final View v = getChildAt(mSelectedPosition - mFirstPosition);
if (v != null) v.setPressed(true);
setPressed(true);
final boolean longClickable = isLongClickable();
Drawable d = selector.getCurrent();
if (d != null && d instanceof TransitionDrawable) {
if (longClickable) {
((TransitionDrawable) d).startTransition(ViewConfiguration
.getLongPressTimeout());
} else {
((TransitionDrawable) d).resetTransition();
}
}
if (longClickable && !mDataChanged) {
if (mPendingCheckForKeyLongPress == null) {
mPendingCheckForKeyLongPress = new CheckForKeyLongPress();
}
mPendingCheckForKeyLongPress.rememberWindowAttachCount();
postDelayed(mPendingCheckForKeyLongPress, ViewConfiguration.getLongPressTimeout());
}
}
}
public void setScrollIndicators(View up, View down) {
mScrollUp = up;
mScrollDown = down;
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mSelector != null) {
mSelector.setState(getDrawableState());
}
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
// If the child view is enabled then do the default behavior.
if (mIsChildViewEnabled) {
// Common case
return super.onCreateDrawableState(extraSpace);
}
// The selector uses this View's drawable state. The selected child view
// is disabled, so we need to remove the enabled state from the drawable
// states.
final int enabledState = ENABLED_STATE_SET[0];
// If we don't have any extra space, it will return one of the static state arrays,
// and clearing the enabled state on those arrays is a bad thing! If we specify
// we need extra space, it will create+copy into a new array that safely mutable.
int[] state = super.onCreateDrawableState(extraSpace + 1);
int enabledPos = -1;
for (int i = state.length - 1; i >= 0; i--) {
if (state[i] == enabledState) {
enabledPos = i;
break;
}
}
// Remove the enabled state
if (enabledPos >= 0) {
System.arraycopy(state, enabledPos + 1, state, enabledPos,
state.length - enabledPos - 1);
}
return state;
}
@Override
public boolean verifyDrawable(Drawable dr) {
return mSelector == dr || super.verifyDrawable(dr);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
final ViewTreeObserver treeObserver = getViewTreeObserver();
if (treeObserver != null) {
treeObserver.addOnTouchModeChangeListener(this);
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
final ViewTreeObserver treeObserver = getViewTreeObserver();
if (treeObserver != null) {
treeObserver.removeOnTouchModeChangeListener(this);
}
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
super.onWindowFocusChanged(hasWindowFocus);
final int touchMode = isInTouchMode() ? TOUCH_MODE_ON : TOUCH_MODE_OFF;
if (!hasWindowFocus) {
setChildrenDrawingCacheEnabled(false);
removeCallbacks(mFlingRunnable);
// Always hide the type filter
dismissPopup();
if (touchMode == TOUCH_MODE_OFF) {
// Remember the last selected element
mResurrectToPosition = mSelectedPosition;
}
} else {
if (mFiltered) {
// Show the type filter only if a filter is in effect
showPopup();
}
// If we changed touch mode since the last time we had focus
if (touchMode != mLastTouchMode && mLastTouchMode != TOUCH_MODE_UNKNOWN) {
// If we come back in trackball mode, we bring the selection back
if (touchMode == TOUCH_MODE_OFF) {
// This will trigger a layout
resurrectSelection();
// If we come back in touch mode, then we want to hide the selector
} else {
hideSelector();
mLayoutMode = LAYOUT_NORMAL;
layoutChildren();
}
}
}
mLastTouchMode = touchMode;
}
/**
* Creates the ContextMenuInfo returned from {@link #getContextMenuInfo()}. This
* methods knows the view, position and ID of the item that received the
* long press.
*
* @param view The view that received the long press.
* @param position The position of the item that received the long press.
* @param id The ID of the item that received the long press.
* @return The extra information that should be returned by
* {@link #getContextMenuInfo()}.
*/
ContextMenuInfo createContextMenuInfo(View view, int position, long id) {
return new AdapterContextMenuInfo(view, position, id);
}
/**
* A base class for Runnables that will check that their view is still attached to
* the original window as when the Runnable was created.
*
*/
private class WindowRunnnable {
private int mOriginalAttachCount;
public void rememberWindowAttachCount() {
mOriginalAttachCount = getWindowAttachCount();
}
public boolean sameWindow() {
return hasWindowFocus() && getWindowAttachCount() == mOriginalAttachCount;
}
}
private class PerformClick extends WindowRunnnable implements Runnable {
View mChild;
int mClickMotionPosition;
public void run() {
// The data has changed since we posted this action in the event queue,
// bail out before bad things happen
if (mDataChanged) return;
if (mAdapter != null && mItemCount > 0 &&
mClickMotionPosition < mAdapter.getCount() && sameWindow()) {
performItemClick(mChild, mClickMotionPosition, getAdapter().getItemId(
mClickMotionPosition));
}
}
}
private class CheckForLongPress extends WindowRunnnable implements Runnable {
public void run() {
final int motionPosition = mMotionPosition;
final View child = getChildAt(motionPosition - mFirstPosition);
if (child != null) {
final int longPressPosition = mMotionPosition;
final long longPressId = mAdapter.getItemId(mMotionPosition);
boolean handled = false;
if (sameWindow() && !mDataChanged) {
handled = performLongPress(child, longPressPosition, longPressId);
}
if (handled) {
mTouchMode = TOUCH_MODE_REST;
setPressed(false);
child.setPressed(false);
} else {
mTouchMode = TOUCH_MODE_DONE_WAITING;
}
}
}
}
private class CheckForKeyLongPress extends WindowRunnnable implements Runnable {
public void run() {
if (isPressed() && mSelectedPosition >= 0) {
int index = mSelectedPosition - mFirstPosition;
View v = getChildAt(index);
if (!mDataChanged) {
boolean handled = false;
if (sameWindow()) {
handled = performLongPress(v, mSelectedPosition, mSelectedRowId);
}
if (handled) {
setPressed(false);
v.setPressed(false);
}
} else {
setPressed(false);
if (v != null) v.setPressed(false);
}
}
}
}
private boolean performLongPress(final View child,
final int longPressPosition, final long longPressId) {
boolean handled = false;
if (mOnItemLongClickListener != null) {
handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, child,
longPressPosition, longPressId);
}
if (!handled) {
mContextMenuInfo = createContextMenuInfo(child, longPressPosition, longPressId);
handled = super.showContextMenuForChild(AbsListView.this);
}
return handled;
}
@Override
protected ContextMenuInfo getContextMenuInfo() {
return mContextMenuInfo;
}
@Override
public boolean showContextMenuForChild(View originalView) {
final int longPressPosition = getPositionForView(originalView);
if (longPressPosition >= 0) {
final long longPressId = mAdapter.getItemId(longPressPosition);
boolean handled = false;
if (mOnItemLongClickListener != null) {
handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, originalView,
longPressPosition, longPressId);
}
if (!handled) {
mContextMenuInfo = createContextMenuInfo(
getChildAt(longPressPosition - mFirstPosition),
longPressPosition, longPressId);
handled = super.showContextMenuForChild(originalView);
}
return handled;
}
return false;
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
if (isPressed() && mSelectedPosition >= 0 && mAdapter != null &&
mSelectedPosition < mAdapter.getCount()) {
final View view = getChildAt(mSelectedPosition - mFirstPosition);
performItemClick(view, mSelectedPosition, mSelectedRowId);
setPressed(false);
if (view != null) view.setPressed(false);
return true;
}
}
return super.onKeyUp(keyCode, event);
}
@Override
protected void dispatchSetPressed(boolean pressed) {
// Don't dispatch setPressed to our children. We call setPressed on ourselves to
// get the selector in the right state, but we don't want to press each child.
}
/**
* Maps a point to a position in the list.
*
* @param x X in local coordinate
* @param y Y in local coordinate
* @return The position of the item which contains the specified point, or
* {@link #INVALID_POSITION} if the point does not intersect an item.
*/
public int pointToPosition(int x, int y) {
Rect frame = mTouchFrame;
if (frame == null) {
mTouchFrame = new Rect();
frame = mTouchFrame;
}
final int count = getChildCount();
for (int i = count - 1; i >= 0; i--) {
final View child = getChildAt(i);
if (child.getVisibility() == View.VISIBLE) {
child.getHitRect(frame);
if (frame.contains(x, y)) {
return mFirstPosition + i;
}
}
}
return INVALID_POSITION;
}
/**
* Maps a point to a the rowId of the item which intersects that point.
*
* @param x X in local coordinate
* @param y Y in local coordinate
* @return The rowId of the item which contains the specified point, or {@link #INVALID_ROW_ID}
* if the point does not intersect an item.
*/
public long pointToRowId(int x, int y) {
int position = pointToPosition(x, y);
if (position >= 0) {
return mAdapter.getItemId(position);
}
return INVALID_ROW_ID;
}
final class CheckForTap implements Runnable {
public void run() {
if (mTouchMode == TOUCH_MODE_DOWN) {
mTouchMode = TOUCH_MODE_TAP;
final View child = getChildAt(mMotionPosition - mFirstPosition);
if (child != null && !child.hasFocusable()) {
mLayoutMode = LAYOUT_NORMAL;
if (!mDataChanged) {
layoutChildren();
child.setPressed(true);
positionSelector(child);
setPressed(true);
final int longPressTimeout = ViewConfiguration.getLongPressTimeout();
final boolean longClickable = isLongClickable();
if (mSelector != null) {
Drawable d = mSelector.getCurrent();
if (d != null && d instanceof TransitionDrawable) {
if (longClickable) {
((TransitionDrawable) d).startTransition(longPressTimeout);
} else {
((TransitionDrawable) d).resetTransition();
}
}
}
if (longClickable) {
if (mPendingCheckForLongPress == null) {
mPendingCheckForLongPress = new CheckForLongPress();
}
mPendingCheckForLongPress.rememberWindowAttachCount();
postDelayed(mPendingCheckForLongPress, longPressTimeout);
} else {
mTouchMode = TOUCH_MODE_DONE_WAITING;
}
} else {
mTouchMode = TOUCH_MODE_DONE_WAITING;
}
}
}
}
}
private boolean startScrollIfNeeded(int deltaY) {
// Check if we have moved far enough that it looks more like a
// scroll than a tap
final int distance = Math.abs(deltaY);
int touchSlop = ViewConfiguration.getTouchSlop();
if (distance > touchSlop) {
createScrollingCache();
mTouchMode = TOUCH_MODE_SCROLL;
mMotionCorrection = deltaY;
final Handler handler = getHandler();
// Handler should not be null unless the AbsListView is not attached to a
// window, which would make it very hard to scroll it... but the monkeys
// say it's possible.
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
setPressed(false);
View motionView = getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionView.setPressed(false);
}
reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
// Time to start stealing events! Once we've stolen them, don't let anyone
// steal from us
requestDisallowInterceptTouchEvent(true);
return true;
}
return false;
}
public void onTouchModeChanged(boolean isInTouchMode) {
if (isInTouchMode) {
// Get rid of the selection when we enter touch mode
hideSelector();
// Layout, but only if we already have done so previously.
// (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore
// state.)
if (getHeight() > 0 && getChildCount() > 0) {
// We do not lose focus initiating a touch (since AbsListView is focusable in
// touch mode). Force an initial layout to get rid of the selection.
mLayoutMode = LAYOUT_NORMAL;
layoutChildren();
}
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mFastScroller != null) {
boolean intercepted = mFastScroller.onTouchEvent(ev);
if (intercepted) {
return true;
}
}
final int action = ev.getAction();
final int x = (int) ev.getX();
final int y = (int) ev.getY();
View v;
int deltaY;
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
switch (action) {
case MotionEvent.ACTION_DOWN: {
int motionPosition = pointToPosition(x, y);
if (!mDataChanged) {
if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0)
&& (getAdapter().isEnabled(motionPosition))) {
// User clicked on an actual view (and was not stopping a fling). It might be a
// click or a scroll. Assume it is a click until proven otherwise
mTouchMode = TOUCH_MODE_DOWN;
// FIXME Debounce
if (mPendingCheckForTap == null) {
mPendingCheckForTap = new CheckForTap();
}
postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
} else {
if (ev.getEdgeFlags() != 0 && motionPosition < 0) {
// If we couldn't find a view to click on, but the down event was touching
// the edge, we will bail out and try again. This allows the edge correcting
// code in ViewRoot to try to find a nearby view to select
return false;
}
// User clicked on whitespace, or stopped a fling. It is a scroll.
createScrollingCache();
mTouchMode = TOUCH_MODE_SCROLL;
motionPosition = findMotionRow(y);
reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
}
}
if (motionPosition >= 0) {
// Remember where the motion event started
v = getChildAt(motionPosition - mFirstPosition);
mMotionViewOriginalTop = v.getTop();
mMotionX = x;
mMotionY = y;
mMotionPosition = motionPosition;
}
mLastY = Integer.MIN_VALUE;
break;
}
case MotionEvent.ACTION_MOVE: {
deltaY = y - mMotionY;
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
// Check if we have moved far enough that it looks more like a
// scroll than a tap
startScrollIfNeeded(deltaY);
break;
case TOUCH_MODE_SCROLL:
if (PROFILE_SCROLLING) {
if (!mScrollProfilingStarted) {
Debug.startMethodTracing("AbsListViewScroll");
mScrollProfilingStarted = true;
}
}
if (y != mLastY) {
deltaY -= mMotionCorrection;
int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
trackMotionScroll(deltaY, incrementalDeltaY);
// Check to see if we have bumped into the scroll limit
View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
// Check if the top of the motion view is where it is
// supposed to be
if (motionView.getTop() != mMotionViewNewTop) {
// We did not scroll the full amount. Treat this essentially like the
// start of a new touch scroll
final int motionPosition = findMotionRow(y);
mMotionCorrection = 0;
motionView = getChildAt(motionPosition - mFirstPosition);
mMotionViewOriginalTop = motionView.getTop();
mMotionY = y;
mMotionPosition = motionPosition;
}
}
mLastY = y;
}
break;
}
break;
}
case MotionEvent.ACTION_UP: {
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
case TOUCH_MODE_TAP:
case TOUCH_MODE_DONE_WAITING:
final int motionPosition = mMotionPosition;
final View child = getChildAt(motionPosition - mFirstPosition);
if (child != null && !child.hasFocusable()) {
if (mTouchMode != TOUCH_MODE_DOWN) {
child.setPressed(false);
}
if (mPerformClick == null) {
mPerformClick = new PerformClick();
}
final AbsListView.PerformClick performClick = mPerformClick;
performClick.mChild = child;
performClick.mClickMotionPosition = motionPosition;
performClick.rememberWindowAttachCount();
mResurrectToPosition = motionPosition;
if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) {
final Handler handler = getHandler();
if (handler != null) {
handler.removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ?
mPendingCheckForTap : mPendingCheckForLongPress);
}
mLayoutMode = LAYOUT_NORMAL;
mTouchMode = TOUCH_MODE_TAP;
if (!mDataChanged) {
setSelectedPositionInt(mMotionPosition);
layoutChildren();
child.setPressed(true);
positionSelector(child);
setPressed(true);
if (mSelector != null) {
Drawable d = mSelector.getCurrent();
if (d != null && d instanceof TransitionDrawable) {
((TransitionDrawable)d).resetTransition();
}
}
postDelayed(new Runnable() {
public void run() {
child.setPressed(false);
setPressed(false);
if (!mDataChanged) {
post(performClick);
}
mTouchMode = TOUCH_MODE_REST;
}
}, ViewConfiguration.getPressedStateDuration());
}
return true;
} else {
if (!mDataChanged) {
post(performClick);
}
}
}
mTouchMode = TOUCH_MODE_REST;
break;
case TOUCH_MODE_SCROLL:
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000);
int initialVelocity = (int)velocityTracker.getYVelocity();
if ((Math.abs(initialVelocity) > ViewConfiguration.getMinimumFlingVelocity()) &&
(getChildCount() > 0)){
if (mFlingRunnable == null) {
mFlingRunnable = new FlingRunnable();
}
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
mFlingRunnable.start(-initialVelocity);
} else {
mTouchMode = TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
}
}
setPressed(false);
// Need to redraw since we probably aren't drawing the selector anymore
invalidate();
final Handler handler = getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
if (PROFILE_SCROLLING) {
if (mScrollProfilingStarted) {
Debug.stopMethodTracing();
mScrollProfilingStarted = false;
}
}
break;
}
case MotionEvent.ACTION_CANCEL: {
mTouchMode = TOUCH_MODE_REST;
setPressed(false);
View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionView.setPressed(false);
}
clearScrollingCache();
final Handler handler = getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForLongPress);
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
}
return true;
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
if (mFastScroller != null) {
mFastScroller.draw(canvas);
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
int action = ev.getAction();
int x = (int) ev.getX();
int y = (int) ev.getY();
View v;
if (mFastScroller != null) {
boolean intercepted = mFastScroller.onInterceptTouchEvent(ev);
if (intercepted) {
return true;
}
}
switch (action) {
case MotionEvent.ACTION_DOWN: {
int motionPosition = findMotionRow(y);
if (mTouchMode != TOUCH_MODE_FLING && motionPosition >= 0) {
// User clicked on an actual view (and was not stopping a fling).
// Remember where the motion event started
v = getChildAt(motionPosition - mFirstPosition);
mMotionViewOriginalTop = v.getTop();
mMotionX = x;
mMotionY = y;
mMotionPosition = motionPosition;
mTouchMode = TOUCH_MODE_DOWN;
clearScrollingCache();
}
mLastY = Integer.MIN_VALUE;
break;
}
case MotionEvent.ACTION_MOVE: {
switch (mTouchMode) {
case TOUCH_MODE_DOWN:
if (startScrollIfNeeded(y - mMotionY)) {
return true;
}
break;
}
break;
}
case MotionEvent.ACTION_UP: {
mTouchMode = TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
break;
}
}
return false;
}
/**
* {@inheritDoc}
*/
@Override
public void addTouchables(ArrayList<View> views) {
final int count = getChildCount();
final int firstPosition = mFirstPosition;
final ListAdapter adapter = mAdapter;
if (adapter == null) {
return;
}
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (adapter.isEnabled(firstPosition + i)) {
views.add(child);
}
child.addTouchables(views);
}
}
/**
* Fires an "on scroll state changed" event to the registered
* {@link android.widget.AbsListView.OnScrollListener}, if any. The state change
* is fired only if the specified state is different from the previously known state.
*
* @param newState The new scroll state.
*/
void reportScrollStateChange(int newState) {
if (newState != mLastScrollState) {
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(this, newState);
mLastScrollState = newState;
}
}
}
/**
* Responsible for fling behavior. Use {@link #start(int)} to
* initiate a fling. Each frame of the fling is handled in {@link #run()}.
* A FlingRunnable will keep re-posting itself until the fling is done.
*
*/
private class FlingRunnable implements Runnable {
/**
* Tracks the decay of a fling scroll
*/
private Scroller mScroller;
/**
* Y value reported by mScroller on the previous fling
*/
private int mLastFlingY;
public FlingRunnable() {
mScroller = new Scroller(getContext());
}
public void start(int initialVelocity) {
int initialY = initialVelocity < 0 ? Integer.MAX_VALUE : 0;
mLastFlingY = initialY;
mScroller.fling(0, initialY, 0, initialVelocity,
0, Integer.MAX_VALUE, 0, Integer.MAX_VALUE);
mTouchMode = TOUCH_MODE_FLING;
post(this);
if (PROFILE_FLINGING) {
if (!mFlingProfilingStarted) {
Debug.startMethodTracing("AbsListViewFling");
mFlingProfilingStarted = true;
}
}
}
private void endFling() {
mTouchMode = TOUCH_MODE_REST;
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
clearScrollingCache();
}
public void run() {
if (mTouchMode != TOUCH_MODE_FLING) {
return;
}
if (mItemCount == 0 || getChildCount() == 0) {
endFling();
return;
}
final Scroller scroller = mScroller;
boolean more = scroller.computeScrollOffset();
final int y = scroller.getCurrY();
// Flip sign to convert finger direction to list items direction
// (e.g. finger moving down means list is moving towards the top)
int delta = mLastFlingY - y;
// Pretend that each frame of a fling scroll is a touch scroll
if (delta > 0) {
// List is moving towards the top. Use first view as mMotionPosition
mMotionPosition = mFirstPosition;
final View firstView = getChildAt(0);
mMotionViewOriginalTop = firstView.getTop();
// Don't fling more than 1 screen
delta = Math.min(getHeight() - mPaddingBottom - mPaddingTop - 1, delta);
} else {
// List is moving towards the bottom. Use last view as mMotionPosition
int offsetToLast = getChildCount() - 1;
mMotionPosition = mFirstPosition + offsetToLast;
final View lastView = getChildAt(offsetToLast);
mMotionViewOriginalTop = lastView.getTop();
// Don't fling more than 1 screen
delta = Math.max(-(getHeight() - mPaddingBottom - mPaddingTop - 1), delta);
}
trackMotionScroll(delta, delta);
// Check to see if we have bumped into the scroll limit
View motionView = getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
// Check if the top of the motion view is where it is
// supposed to be
if (motionView.getTop() != mMotionViewNewTop) {
more = false;
}
}
if (more) {
mLastFlingY = y;
post(this);
} else {
endFling();
if (PROFILE_FLINGING) {
if (mFlingProfilingStarted) {
Debug.stopMethodTracing();
mFlingProfilingStarted = false;
}
}
}
}
}
private void createScrollingCache() {
if (mScrollingCacheEnabled && !mCachingStarted) {
setChildrenDrawnWithCacheEnabled(true);
setChildrenDrawingCacheEnabled(true);
mCachingStarted = true;
}
}
private void clearScrollingCache() {
if (mCachingStarted) {
setChildrenDrawnWithCacheEnabled(false);
if ((mPersistentDrawingCache & PERSISTENT_SCROLLING_CACHE) == 0) {
setChildrenDrawingCacheEnabled(false);
}
if (!isAlwaysDrawnWithCacheEnabled()) {
invalidate();
}
mCachingStarted = false;
}
}
/**
* Track a motion scroll
*
* @param deltaY Amount to offset mMotionView. This is the accumulated delta since the motion
* began. Positive numbers mean the user's finger is moving down the screen.
* @param incrementalDeltaY Change in deltaY from the previous event.
*/
void trackMotionScroll(int deltaY, int incrementalDeltaY) {
final int childCount = getChildCount();
if (childCount == 0) {
return;
}
final int firstTop = getChildAt(0).getTop();
final int lastBottom = getChildAt(childCount - 1).getBottom();
final Rect listPadding = mListPadding;
// FIXME account for grid vertical spacing too?
final int spaceAbove = listPadding.top - firstTop;
final int end = getHeight() - listPadding.bottom;
final int spaceBelow = lastBottom - end;
final int height = getHeight() - mPaddingBottom - mPaddingTop;
if (deltaY < 0) {
deltaY = Math.max(-(height - 1), deltaY);
} else {
deltaY = Math.min(height - 1, deltaY);
}
if (incrementalDeltaY < 0) {
incrementalDeltaY = Math.max(-(height - 1), incrementalDeltaY);
} else {
incrementalDeltaY = Math.min(height - 1, incrementalDeltaY);
}
final int absIncrementalDeltaY = Math.abs(incrementalDeltaY);
if (spaceAbove >= absIncrementalDeltaY && spaceBelow >= absIncrementalDeltaY) {
hideSelector();
offsetChildrenTopAndBottom(incrementalDeltaY);
invalidate();
mMotionViewNewTop = mMotionViewOriginalTop + deltaY;
} else {
final int firstPosition = mFirstPosition;
if (firstPosition == 0 && firstTop >= listPadding.top && deltaY > 0) {
// Don't need to move views down if the top of the first position is already visible
return;
}
if (firstPosition + childCount == mItemCount && lastBottom <= end && deltaY < 0) {
// Don't need to move views up if the bottom of the last position is already visible
return;
}
final boolean down = incrementalDeltaY < 0;
hideSelector();
final int headerViewsCount = getHeaderViewsCount();
final int footerViewsStart = mItemCount - getFooterViewsCount();
int start = 0;
int count = 0;
if (down) {
final int top = listPadding.top - incrementalDeltaY;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getBottom() >= top) {
break;
} else {
count++;
int position = firstPosition + i;
if (position >= headerViewsCount && position < footerViewsStart) {
mRecycler.addScrapView(child);
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(child,
ViewDebug.RecyclerTraceType.MOVE_TO_SCRAP_HEAP,
firstPosition + i, -1);
}
}
}
}
} else {
final int bottom = getHeight() - listPadding.bottom - incrementalDeltaY;
for (int i = childCount - 1; i >= 0; i--) {
final View child = getChildAt(i);
if (child.getTop() <= bottom) {
break;
} else {
start = i;
count++;
int position = firstPosition + i;
if (position >= headerViewsCount && position < footerViewsStart) {
mRecycler.addScrapView(child);
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(child,
ViewDebug.RecyclerTraceType.MOVE_TO_SCRAP_HEAP,
firstPosition + i, -1);
}
}
}
}
}
mMotionViewNewTop = mMotionViewOriginalTop + deltaY;
mBlockLayoutRequests = true;
detachViewsFromParent(start, count);
offsetChildrenTopAndBottom(incrementalDeltaY);
if (down) {
mFirstPosition += count;
}
invalidate();
fillGap(down);
mBlockLayoutRequests = false;
invokeOnItemScrollListener();
}
}
/**
* Returns the number of header views in the list. Header views are special views
* at the top of the list that should not be recycled during a layout.
*
* @return The number of header views, 0 in the default implementation.
*/
int getHeaderViewsCount() {
return 0;
}
/**
* Returns the number of footer views in the list. Footer views are special views
* at the bottom of the list that should not be recycled during a layout.
*
* @return The number of footer views, 0 in the default implementation.
*/
int getFooterViewsCount() {
return 0;
}
/**
* Fills the gap left open by a touch-scroll. During a touch scroll, children that
* remain on screen are shifted and the other ones are discarded. The role of this
* method is to fill the gap thus created by performing a partial layout in the
* empty space.
*
* @param down true if the scroll is going down, false if it is going up
*/
abstract void fillGap(boolean down);
void hideSelector() {
if (mSelectedPosition != INVALID_POSITION) {
mResurrectToPosition = mSelectedPosition;
if (mNextSelectedPosition >= 0 && mNextSelectedPosition != mSelectedPosition) {
mResurrectToPosition = mNextSelectedPosition;
}
setSelectedPositionInt(INVALID_POSITION);
setNextSelectedPositionInt(INVALID_POSITION);
mSelectedTop = 0;
mSelectorRect.setEmpty();
}
}
/**
* @return A position to select. First we try mSelectedPosition. If that has been clobbered by
* entering touch mode, we then try mResurrectToPosition. Values are pinned to the range
* of items available in the adapter
*/
int reconcileSelectedPosition() {
int position = mSelectedPosition;
if (position < 0) {
position = mResurrectToPosition;
}
position = Math.max(0, position);
position = Math.min(position, mItemCount - 1);
return position;
}
/**
* Find the row closest to y. This row will be used as the motion row when scrolling
*
* @param y Where the user touched
* @return The position of the first (or only) item in the row closest to y
*/
abstract int findMotionRow(int y);
/**
* Causes all the views to be rebuilt and redrawn.
*/
public void invalidateViews() {
mDataChanged = true;
rememberSyncState();
requestLayout();
invalidate();
}
/**
* Makes the item at the supplied position selected.
*
* @param position the position of the new selection
*/
abstract void setSelectionInt(int position);
/**
* Attempt to bring the selection back if the user is switching from touch
* to trackball mode
* @return Whether selection was set to something.
*/
boolean resurrectSelection() {
final int childCount = getChildCount();
if (childCount <= 0) {
return false;
}
int selectedTop = 0;
int selectedPos;
int childrenTop = mListPadding.top;
int childrenBottom = mBottom - mTop - mListPadding.bottom;
final int firstPosition = mFirstPosition;
final int toPosition = mResurrectToPosition;
boolean down = true;
if (toPosition >= firstPosition && toPosition < firstPosition + childCount) {
selectedPos = toPosition;
final View selected = getChildAt(selectedPos - mFirstPosition);
selectedTop = selected.getTop();
int selectedBottom = selected.getBottom();
// We are scrolled, don't get in the fade
if (selectedTop < childrenTop) {
selectedTop = childrenTop + getVerticalFadingEdgeLength();
} else if (selectedBottom > childrenBottom) {
selectedTop = childrenBottom - selected.getMeasuredHeight()
- getVerticalFadingEdgeLength();
}
} else {
if (toPosition < firstPosition) {
// Default to selecting whatever is first
selectedPos = firstPosition;
for (int i = 0; i < childCount; i++) {
final View v = getChildAt(i);
final int top = v.getTop();
if (i == 0) {
// Remember the position of the first item
selectedTop = top;
// See if we are scrolled at all
if (firstPosition > 0 || top < childrenTop) {
// If we are scrolled, don't select anything that is
// in the fade region
childrenTop += getVerticalFadingEdgeLength();
}
}
if (top >= childrenTop) {
// Found a view whose top is fully visisble
selectedPos = firstPosition + i;
selectedTop = top;
break;
}
}
} else {
final int itemCount = mItemCount;
down = false;
selectedPos = firstPosition + childCount - 1;
for (int i = childCount - 1; i >= 0; i--) {
final View v = getChildAt(i);
final int top = v.getTop();
final int bottom = v.getBottom();
if (i == childCount - 1) {
selectedTop = top;
if (firstPosition + childCount < itemCount || bottom > childrenBottom) {
childrenBottom -= getVerticalFadingEdgeLength();
}
}
if (bottom <= childrenBottom) {
selectedPos = firstPosition + i;
selectedTop = top;
break;
}
}
}
}
mResurrectToPosition = INVALID_POSITION;
removeCallbacks(mFlingRunnable);
mTouchMode = TOUCH_MODE_REST;
clearScrollingCache();
mSpecificTop = selectedTop;
selectedPos = lookForSelectablePosition(selectedPos, down);
if (selectedPos >= 0) {
mLayoutMode = LAYOUT_SPECIFIC;
setSelectionInt(selectedPos);
invokeOnItemScrollListener();
}
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
return selectedPos >= 0;
}
@Override
protected void handleDataChanged() {
int count = mItemCount;
if (count > 0) {
int newPos;
int selectablePos;
// Find the row we are supposed to sync to
if (mNeedSync) {
// Update this first, since setNextSelectedPositionInt inspects it
mNeedSync = false;
if (mTranscriptMode == TRANSCRIPT_MODE_ALWAYS_SCROLL ||
(mTranscriptMode == TRANSCRIPT_MODE_NORMAL &&
mFirstPosition + getChildCount() >= mOldItemCount)) {
mLayoutMode = LAYOUT_FORCE_BOTTOM;
return;
}
switch (mSyncMode) {
case SYNC_SELECTED_POSITION:
if (isInTouchMode()) {
// We saved our state when not in touch mode. (We know this because
// mSyncMode is SYNC_SELECTED_POSITION.) Now we are trying to
// restore in touch mode. Just leave mSyncPosition as it is (possibly
// adjusting if the available range changed) and return.
mLayoutMode = LAYOUT_SYNC;
mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1);
return;
} else {
// See if we can find a position in the new data with the same
// id as the old selection. This will change mSyncPosition.
newPos = findSyncPosition();
if (newPos >= 0) {
// Found it. Now verify that new selection is still selectable
selectablePos = lookForSelectablePosition(newPos, true);
if (selectablePos == newPos) {
// Same row id is selected
mSyncPosition = newPos;
if (mSyncHeight == getHeight()) {
// If we are at the same height as when we saved state, try
// to restore the scroll position too.
mLayoutMode = LAYOUT_SYNC;
} else {
// We are not the same height as when the selection was saved, so
// don't try to restore the exact position
mLayoutMode = LAYOUT_SET_SELECTION;
}
// Restore selection
setNextSelectedPositionInt(newPos);
return;
}
}
}
break;
case SYNC_FIRST_POSITION:
// Leave mSyncPosition as it is -- just pin to available range
mLayoutMode = LAYOUT_SYNC;
mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1);
return;
}
}
if (!isInTouchMode()) {
// We couldn't find matching data -- try to use the same position
newPos = getSelectedItemPosition();
// Pin position to the available range
if (newPos >= count) {
newPos = count - 1;
}
if (newPos < 0) {
newPos = 0;
}
// Make sure we select something selectable -- first look down
selectablePos = lookForSelectablePosition(newPos, true);
if (selectablePos >= 0) {
setNextSelectedPositionInt(selectablePos);
return;
} else {
// Looking down didn't work -- try looking up
selectablePos = lookForSelectablePosition(newPos, false);
if (selectablePos >= 0) {
setNextSelectedPositionInt(selectablePos);
return;
}
}
} else {
// We already know where we want to resurrect the selection
if (mResurrectToPosition >= 0) {
return;
}
}
}
// Nothing is selected. Give up and reset everything.
mLayoutMode = mStackFromBottom ? LAYOUT_FORCE_BOTTOM : LAYOUT_FORCE_TOP;
mSelectedPosition = INVALID_POSITION;
mSelectedRowId = INVALID_ROW_ID;
mNextSelectedPosition = INVALID_POSITION;
mNextSelectedRowId = INVALID_ROW_ID;
mNeedSync = false;
checkSelectionChanged();
}
/**
* Removes the filter window
*/
void dismissPopup() {
if (mPopup != null) {
mPopup.dismiss();
}
}
/**
* Shows the filter window
*/
private void showPopup() {
// Make sure we have a window before showing the popup
if (getWindowVisibility() == View.VISIBLE) {
int screenHeight = WindowManagerImpl.getDefault().getDefaultDisplay().getHeight();
final int[] xy = new int[2];
getLocationOnScreen(xy);
int bottomGap = screenHeight - xy[1] - getHeight() + 20;
mPopup.showAtLocation(this, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL,
xy[0], bottomGap);
// Make sure we get focus if we are showing the popup
checkFocus();
}
}
/**
* What is the distance between the source and destination rectangles given the direction of
* focus navigation between them? The direction basically helps figure out more quickly what is
* self evident by the relationship between the rects...
*
* @param source the source rectangle
* @param dest the destination rectangle
* @param direction the direction
* @return the distance between the rectangles
*/
static int getDistance(Rect source, Rect dest, int direction) {
int sX, sY; // source x, y
int dX, dY; // dest x, y
switch (direction) {
case View.FOCUS_RIGHT:
sX = source.right;
sY = source.top + source.height() / 2;
dX = dest.left;
dY = dest.top + dest.height() / 2;
break;
case View.FOCUS_DOWN:
sX = source.left + source.width() / 2;
sY = source.bottom;
dX = dest.left + dest.width() / 2;
dY = dest.top;
break;
case View.FOCUS_LEFT:
sX = source.left;
sY = source.top + source.height() / 2;
dX = dest.right;
dY = dest.top + dest.height() / 2;
break;
case View.FOCUS_UP:
sX = source.left + source.width() / 2;
sY = source.top;
dX = dest.left + dest.width() / 2;
dY = dest.bottom;
break;
default:
throw new IllegalArgumentException("direction must be one of "
+ "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT}.");
}
int deltaX = dX - sX;
int deltaY = dY - sY;
return deltaY * deltaY + deltaX * deltaX;
}
@Override
protected boolean isInFilterMode() {
return mFiltered;
}
/**
* Sends a key to the text filter window
*
* @param keyCode The keycode for the event
* @param event The actual key event
*
* @return True if the text filter handled the event, false otherwise.
*/
boolean sendToTextFilter(int keyCode, int count, KeyEvent event) {
if (!mTextFilterEnabled || !(getAdapter() instanceof Filterable) ||
((Filterable) getAdapter()).getFilter() == null) {
return false;
}
boolean handled = false;
boolean okToSend = true;
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
okToSend = false;
break;
case KeyEvent.KEYCODE_BACK:
if (mFiltered && mPopup != null && mPopup.isShowing() &&
event.getAction() == KeyEvent.ACTION_DOWN) {
handled = true;
mTextFilter.setText("");
}
okToSend = false;
break;
case KeyEvent.KEYCODE_SPACE:
// Only send spaces once we are filtered
okToSend = mFiltered = true;
break;
}
if (okToSend) {
createTextFilter(true);
KeyEvent forwardEvent = event;
if (forwardEvent.getRepeatCount() > 0) {
forwardEvent = new KeyEvent(event, event.getEventTime(), 0);
}
int action = event.getAction();
switch (action) {
case KeyEvent.ACTION_DOWN:
handled = mTextFilter.onKeyDown(keyCode, forwardEvent);
break;
case KeyEvent.ACTION_UP:
handled = mTextFilter.onKeyUp(keyCode, forwardEvent);
break;
case KeyEvent.ACTION_MULTIPLE:
handled = mTextFilter.onKeyMultiple(keyCode, count, event);
break;
}
}
return handled;
}
/**
* Creates the window for the text filter and populates it with an EditText field;
*
* @param animateEntrance true if the window should appear with an animation
*/
private void createTextFilter(boolean animateEntrance) {
if (mPopup == null) {
Context c = getContext();
PopupWindow p = new PopupWindow(c);
LayoutInflater layoutInflater = (LayoutInflater) c
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mTextFilter = (EditText) layoutInflater.inflate(
com.android.internal.R.layout.typing_filter, null);
mTextFilter.addTextChangedListener(this);
p.setFocusable(false);
p.setTouchable(false);
p.setContentView(mTextFilter);
p.setWidth(LayoutParams.WRAP_CONTENT);
p.setHeight(LayoutParams.WRAP_CONTENT);
p.setBackgroundDrawable(null);
mPopup = p;
getViewTreeObserver().addOnGlobalLayoutListener(this);
}
if (animateEntrance) {
mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilter);
} else {
mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilterRestore);
}
}
/**
* Clear the text filter.
*/
public void clearTextFilter() {
if (mFiltered) {
mTextFilter.setText("");
mFiltered = false;
if (mPopup != null && mPopup.isShowing()) {
dismissPopup();
}
}
}
/**
* Returns if the ListView currently has a text filter.
*/
public boolean hasTextFilter() {
return mFiltered;
}
public void onGlobalLayout() {
if (isShown()) {
// Show the popup if we are filtered
if (mFiltered && mPopup != null && !mPopup.isShowing()) {
showPopup();
}
} else {
// Hide the popup when we are no longer visible
if (mPopup.isShowing()) {
dismissPopup();
}
}
}
/**
* For our text watcher that associated with the text filter
*/
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
/**
* For our text watcher that associated with the text filter. Performs the actual
* filtering as the text changes.
*/
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (mPopup != null) {
int length = s.length();
boolean showing = mPopup.isShowing();
if (!showing && length > 0) {
// Show the filter popup if necessary
showPopup();
mFiltered = true;
} else if (showing && length == 0) {
// Remove the filter popup if the user has cleared all text
mPopup.dismiss();
mFiltered = false;
}
if (mAdapter instanceof Filterable) {
Filter f = ((Filterable) mAdapter).getFilter();
// Filter should not be null when we reach this part
if (f != null) {
f.filter(s, this);
} else {
throw new IllegalStateException("You cannot call onTextChanged with a non "
+ "filterable adapter");
}
}
}
}
/**
* For our text watcher that associated with the text filter
*/
public void afterTextChanged(Editable s) {
}
public void onFilterComplete(int count) {
if (mSelectedPosition < 0 && count > 0) {
mResurrectToPosition = INVALID_POSITION;
resurrectSelection();
}
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new AbsListView.LayoutParams(getContext(), attrs);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof AbsListView.LayoutParams;
}
/**
* Puts the list or grid into transcript mode. In this mode the list or grid will always scroll
* to the bottom to show new items.
*
* @param mode the transcript mode to set
*
* @see #TRANSCRIPT_MODE_DISABLED
* @see #TRANSCRIPT_MODE_NORMAL
* @see #TRANSCRIPT_MODE_ALWAYS_SCROLL
*/
public void setTranscriptMode(int mode) {
mTranscriptMode = mode;
}
/**
* Returns the current transcript mode.
*
* @return {@link #TRANSCRIPT_MODE_DISABLED}, {@link #TRANSCRIPT_MODE_NORMAL} or
* {@link #TRANSCRIPT_MODE_ALWAYS_SCROLL}
*/
public int getTranscriptMode() {
return mTranscriptMode;
}
@Override
public int getSolidColor() {
return mCacheColorHint;
}
/**
* When set to a non-zero value, the cache color hint indicates that this list is always drawn
* on top of a solid, single-color, opaque background
*
* @param color The background color
*/
public void setCacheColorHint(int color) {
mCacheColorHint = color;
}
/**
* When set to a non-zero value, the cache color hint indicates that this list is always drawn
* on top of a solid, single-color, opaque background
*
* @return The cache color hint
*/
public int getCacheColorHint() {
return mCacheColorHint;
}
/**
* Move all views (excluding headers and footers) held by this AbsListView into the supplied
* List. This includes views displayed on the screen as well as views stored in AbsListView's
* internal view recycler.
*
* @param views A list into which to put the reclaimed views
*/
public void reclaimViews(List<View> views) {
int childCount = getChildCount();
RecyclerListener listener = mRecycler.mRecyclerListener;
// Reclaim views on screen
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
AbsListView.LayoutParams lp = (AbsListView.LayoutParams)child.getLayoutParams();
// Don't reclaim header or footer views, or views that should be ignored
if (lp != null && mRecycler.shouldRecycleViewType(lp.viewType)) {
views.add(child);
if (listener != null) {
// Pretend they went through the scrap heap
listener.onMovedToScrapHeap(child);
}
}
}
mRecycler.reclaimScrapViews(views);
removeAllViewsInLayout();
}
/**
* Sets the recycler listener to be notified whenever a View is set aside in
* the recycler for later reuse. This listener can be used to free resources
* associated to the View.
*
* @param listener The recycler listener to be notified of views set aside
* in the recycler.
*
* @see android.widget.AbsListView.RecycleBin
* @see android.widget.AbsListView.RecyclerListener
*/
public void setRecyclerListener(RecyclerListener listener) {
mRecycler.mRecyclerListener = listener;
}
/**
* AbsListView extends LayoutParams to provide a place to hold the view type.
*/
public static class LayoutParams extends ViewGroup.LayoutParams {
/**
* View type for this view, as returned by
* {@link android.widget.Adapter#getItemViewType(int) }
*/
int viewType;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
}
public LayoutParams(int w, int h) {
super(w, h);
}
public LayoutParams(int w, int h, int viewType) {
super(w, h);
this.viewType = viewType;
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}
}
/**
* A RecyclerListener is used to receive a notification whenever a View is placed
* inside the RecycleBin's scrap heap. This listener is used to free resources
* associated to Views placed in the RecycleBin.
*
* @see android.widget.AbsListView.RecycleBin
* @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener)
*/
public static interface RecyclerListener {
/**
* Indicates that the specified View was moved into the recycler's scrap heap.
* The view is not displayed on screen any more and any expensive resource
* associated with the view should be discarded.
*
* @param view
*/
void onMovedToScrapHeap(View view);
}
/**
* The RecycleBin facilitates reuse of views across layouts. The RecycleBin has two levels of
* storage: ActiveViews and ScrapViews. ActiveViews are those views which were onscreen at the
* start of a layout. By construction, they are displaying current information. At the end of
* layout, all views in ActiveViews are demoted to ScrapViews. ScrapViews are old views that
* could potentially be used by the adapter to avoid allocating views unnecessarily.
*
* @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener)
* @see android.widget.AbsListView.RecyclerListener
*/
class RecycleBin {
private RecyclerListener mRecyclerListener;
/**
* The position of the first view stored in mActiveViews.
*/
private int mFirstActivePosition;
/**
* Views that were on screen at the start of layout. This array is populated at the start of
* layout, and at the end of layout all view in mActiveViews are moved to mScrapViews.
* Views in mActiveViews represent a contiguous range of Views, with position of the first
* view store in mFirstActivePosition.
*/
private View[] mActiveViews = new View[0];
/**
* Unsorted views that can be used by the adapter as a convert view.
*/
private ArrayList<View>[] mScrapViews;
private int mViewTypeCount;
private ArrayList<View> mCurrentScrap;
public void setViewTypeCount(int viewTypeCount) {
if (viewTypeCount < 1) {
throw new IllegalArgumentException("Can't have a viewTypeCount < 1");
}
//noinspection unchecked
ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount];
for (int i = 0; i < viewTypeCount; i++) {
scrapViews[i] = new ArrayList<View>();
}
mViewTypeCount = viewTypeCount;
mCurrentScrap = scrapViews[0];
mScrapViews = scrapViews;
}
public boolean shouldRecycleViewType(int viewType) {
return viewType >= 0;
}
/**
* Clears the scrap heap.
*/
void clear() {
if (mViewTypeCount == 1) {
final ArrayList<View> scrap = mCurrentScrap;
final int scrapCount = scrap.size();
for (int i = 0; i < scrapCount; i++) {
removeDetachedView(scrap.remove(scrapCount - 1 - i), false);
}
} else {
final int typeCount = mViewTypeCount;
for (int i = 0; i < typeCount; i++) {
final ArrayList<View> scrap = mScrapViews[i];
final int scrapCount = scrap.size();
for (int j = 0; j < scrapCount; j++) {
removeDetachedView(scrap.remove(scrapCount - 1 - j), false);
}
}
}
}
/**
* Fill ActiveViews with all of the children of the AbsListView.
*
* @param childCount The minimum number of views mActiveViews should hold
* @param firstActivePosition The position of the first view that will be stored in
* mActiveViews
*/
void fillActiveViews(int childCount, int firstActivePosition) {
if (mActiveViews.length < childCount) {
mActiveViews = new View[childCount];
}
mFirstActivePosition = firstActivePosition;
final View[] activeViews = mActiveViews;
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
AbsListView.LayoutParams lp = (AbsListView.LayoutParams)child.getLayoutParams();
// Don't put header or footer views into the scrap heap
if (lp != null && lp.viewType != AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
// Note: We do place AdapterView.ITEM_VIEW_TYPE_IGNORE in active views.
// However, we will NOT place them into scrap views.
activeViews[i] = getChildAt(i);
}
}
}
/**
* Get the view corresponding to the specified position. The view will be removed from
* mActiveViews if it is found.
*
* @param position The position to look up in mActiveViews
* @return The view if it is found, null otherwise
*/
View getActiveView(int position) {
int index = position - mFirstActivePosition;
final View[] activeViews = mActiveViews;
if (index >=0 && index < activeViews.length) {
final View match = activeViews[index];
activeViews[index] = null;
return match;
}
return null;
}
/**
* @return A view from the ScrapViews collection. These are unordered.
*/
View getScrapView(int position) {
ArrayList<View> scrapViews;
if (mViewTypeCount == 1) {
scrapViews = mCurrentScrap;
int size = scrapViews.size();
if (size > 0) {
return scrapViews.remove(size - 1);
} else {
return null;
}
} else {
int whichScrap = mAdapter.getItemViewType(position);
if (whichScrap >= 0 && whichScrap < mScrapViews.length) {
scrapViews = mScrapViews[whichScrap];
int size = scrapViews.size();
if (size > 0) {
return scrapViews.remove(size - 1);
}
}
}
return null;
}
/**
* Put a view into the ScapViews list. These views are unordered.
*
* @param scrap The view to add
*/
void addScrapView(View scrap) {
AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams();
if (lp == null) {
return;
}
// Don't put header or footer views or views that should be ignored
// into the scrap heap
int viewType = lp.viewType;
if (!shouldRecycleViewType(viewType)) {
return;
}
if (mViewTypeCount == 1) {
mCurrentScrap.add(scrap);
} else {
mScrapViews[viewType].add(scrap);
}
if (mRecyclerListener != null) {
mRecyclerListener.onMovedToScrapHeap(scrap);
}
}
/**
* Move all views remaining in mActiveViews to mScrapViews.
*/
void scrapActiveViews() {
final View[] activeViews = mActiveViews;
final boolean hasListener = mRecyclerListener != null;
final boolean multipleScraps = mViewTypeCount > 1;
ArrayList<View> scrapViews = mCurrentScrap;
final int count = activeViews.length;
for (int i = 0; i < count; ++i) {
final View victim = activeViews[i];
if (victim != null) {
int whichScrap = ((AbsListView.LayoutParams)
victim.getLayoutParams()).viewType;
activeViews[i] = null;
if (whichScrap == AdapterView.ITEM_VIEW_TYPE_IGNORE) {
// Do not move views that should be ignored
continue;
}
if (multipleScraps) {
scrapViews = mScrapViews[whichScrap];
}
scrapViews.add(victim);
if (hasListener) {
mRecyclerListener.onMovedToScrapHeap(victim);
}
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(victim,
ViewDebug.RecyclerTraceType.MOVE_FROM_ACTIVE_TO_SCRAP_HEAP,
mFirstActivePosition + i, -1);
}
}
}
pruneScrapViews();
}
/**
* Makes sure that the size of mScrapViews does not exceed the size of mActiveViews.
* (This can happen if an adapter does not recycle its views).
*/
private void pruneScrapViews() {
final int maxViews = mActiveViews.length;
final int viewTypeCount = mViewTypeCount;
final ArrayList<View>[] scrapViews = mScrapViews;
for (int i = 0; i < viewTypeCount; ++i) {
final ArrayList<View> scrapPile = scrapViews[i];
int size = scrapPile.size();
final int extras = size - maxViews;
size--;
for (int j = 0; j < extras; j++) {
removeDetachedView(scrapPile.remove(size--), false);
}
}
}
/**
* Puts all views in the scrap heap into the supplied list.
*/
void reclaimScrapViews(List<View> views) {
if (mViewTypeCount == 1) {
views.addAll(mCurrentScrap);
} else {
final int viewTypeCount = mViewTypeCount;
final ArrayList<View>[] scrapViews = mScrapViews;
for (int i = 0; i < viewTypeCount; ++i) {
final ArrayList<View> scrapPile = scrapViews[i];
views.addAll(scrapPile);
}
}
}
}
}