| /* |
| * Copyright (C) 2013 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.support.v4.widget; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.PixelFormat; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.os.SystemClock; |
| import android.support.v4.view.AccessibilityDelegateCompat; |
| import android.support.v4.view.GravityCompat; |
| import android.support.v4.view.KeyEventCompat; |
| import android.support.v4.view.MotionEventCompat; |
| import android.support.v4.view.ViewCompat; |
| import android.support.v4.view.ViewGroupCompat; |
| import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; |
| import android.util.AttributeSet; |
| import android.view.Gravity; |
| import android.view.KeyEvent; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.ViewParent; |
| import android.view.accessibility.AccessibilityEvent; |
| |
| /** |
| * DrawerLayout acts as a top-level container for window content that allows for |
| * interactive "drawer" views to be pulled out from the edge of the window. |
| * |
| * <p>Drawer positioning and layout is controlled using the <code>android:layout_gravity</code> |
| * attribute on child views corresponding to which side of the view you want the drawer |
| * to emerge from: left or right. (Or start/end on platform versions that support layout direction.) |
| * </p> |
| * |
| * <p>To use a DrawerLayout, position your primary content view as the first child with |
| * a width and height of <code>match_parent</code>. Add drawers as child views after the main |
| * content view and set the <code>layout_gravity</code> appropriately. Drawers commonly use |
| * <code>match_parent</code> for height with a fixed width.</p> |
| * |
| * <p>{@link DrawerListener} can be used to monitor the state and motion of drawer views. |
| * Avoid performing expensive operations such as layout during animation as it can cause |
| * stuttering; try to perform expensive operations during the {@link #STATE_IDLE} state. |
| * {@link SimpleDrawerListener} offers default/no-op implementations of each callback method.</p> |
| * |
| * <p>As per the Android Design guide, any drawers positioned to the left/start should |
| * always contain content for navigating around the application, whereas any drawers |
| * positioned to the right/end should always contain actions to take on the current content. |
| * This preserves the same navigation left, actions right structure present in the Action Bar |
| * and elsewhere.</p> |
| */ |
| public class DrawerLayout extends ViewGroup { |
| private static final String TAG = "DrawerLayout"; |
| |
| /** |
| * Indicates that any drawers are in an idle, settled state. No animation is in progress. |
| */ |
| public static final int STATE_IDLE = ViewDragHelper.STATE_IDLE; |
| |
| /** |
| * Indicates that a drawer is currently being dragged by the user. |
| */ |
| public static final int STATE_DRAGGING = ViewDragHelper.STATE_DRAGGING; |
| |
| /** |
| * Indicates that a drawer is in the process of settling to a final position. |
| */ |
| public static final int STATE_SETTLING = ViewDragHelper.STATE_SETTLING; |
| |
| /** |
| * The drawer is unlocked. |
| */ |
| public static final int LOCK_MODE_UNLOCKED = 0; |
| |
| /** |
| * The drawer is locked closed. The user may not open it, though |
| * the app may open it programmatically. |
| */ |
| public static final int LOCK_MODE_LOCKED_CLOSED = 1; |
| |
| /** |
| * The drawer is locked open. The user may not close it, though the app |
| * may close it programmatically. |
| */ |
| public static final int LOCK_MODE_LOCKED_OPEN = 2; |
| |
| private static final int MIN_DRAWER_MARGIN = 64; // dp |
| |
| private static final int DEFAULT_SCRIM_COLOR = 0x99000000; |
| |
| /** |
| * Length of time to delay before peeking the drawer. |
| */ |
| private static final int PEEK_DELAY = 160; // ms |
| |
| /** |
| * Minimum velocity that will be detected as a fling |
| */ |
| private static final int MIN_FLING_VELOCITY = 400; // dips per second |
| |
| /** |
| * Experimental feature. |
| */ |
| private static final boolean ALLOW_EDGE_LOCK = false; |
| |
| private static final boolean CHILDREN_DISALLOW_INTERCEPT = true; |
| |
| private static final float TOUCH_SLOP_SENSITIVITY = 1.f; |
| |
| private static final int[] LAYOUT_ATTRS = new int[] { |
| android.R.attr.layout_gravity |
| }; |
| |
| private int mMinDrawerMargin; |
| |
| private int mScrimColor = DEFAULT_SCRIM_COLOR; |
| private float mScrimOpacity; |
| private Paint mScrimPaint = new Paint(); |
| |
| private final ViewDragHelper mLeftDragger; |
| private final ViewDragHelper mRightDragger; |
| private final ViewDragCallback mLeftCallback; |
| private final ViewDragCallback mRightCallback; |
| private int mDrawerState; |
| private boolean mInLayout; |
| private boolean mFirstLayout = true; |
| private int mLockModeLeft; |
| private int mLockModeRight; |
| private boolean mDisallowInterceptRequested; |
| private boolean mChildrenCanceledTouch; |
| |
| private DrawerListener mListener; |
| |
| private float mInitialMotionX; |
| private float mInitialMotionY; |
| |
| private Drawable mShadowLeft; |
| private Drawable mShadowRight; |
| |
| /** |
| * Listener for monitoring events about drawers. |
| */ |
| public interface DrawerListener { |
| /** |
| * Called when a drawer's position changes. |
| * @param drawerView The child view that was moved |
| * @param slideOffset The new offset of this drawer within its range, from 0-1 |
| */ |
| public void onDrawerSlide(View drawerView, float slideOffset); |
| |
| /** |
| * Called when a drawer has settled in a completely open state. |
| * The drawer is interactive at this point. |
| * |
| * @param drawerView Drawer view that is now open |
| */ |
| public void onDrawerOpened(View drawerView); |
| |
| /** |
| * Called when a drawer has settled in a completely closed state. |
| * |
| * @param drawerView Drawer view that is now closed |
| */ |
| public void onDrawerClosed(View drawerView); |
| |
| /** |
| * Called when the drawer motion state changes. The new state will |
| * be one of {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}. |
| * |
| * @param newState The new drawer motion state |
| */ |
| public void onDrawerStateChanged(int newState); |
| } |
| |
| /** |
| * Stub/no-op implementations of all methods of {@link DrawerListener}. |
| * Override this if you only care about a few of the available callback methods. |
| */ |
| public static abstract class SimpleDrawerListener implements DrawerListener { |
| @Override |
| public void onDrawerSlide(View drawerView, float slideOffset) { |
| } |
| |
| @Override |
| public void onDrawerOpened(View drawerView) { |
| } |
| |
| @Override |
| public void onDrawerClosed(View drawerView) { |
| } |
| |
| @Override |
| public void onDrawerStateChanged(int newState) { |
| } |
| } |
| |
| public DrawerLayout(Context context) { |
| this(context, null); |
| } |
| |
| public DrawerLayout(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public DrawerLayout(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| final float density = getResources().getDisplayMetrics().density; |
| mMinDrawerMargin = (int) (MIN_DRAWER_MARGIN * density + 0.5f); |
| final float minVel = MIN_FLING_VELOCITY * density; |
| |
| mLeftCallback = new ViewDragCallback(Gravity.LEFT); |
| mRightCallback = new ViewDragCallback(Gravity.RIGHT); |
| |
| mLeftDragger = ViewDragHelper.create(this, TOUCH_SLOP_SENSITIVITY, mLeftCallback); |
| mLeftDragger.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT); |
| mLeftDragger.setMinVelocity(minVel); |
| mLeftCallback.setDragger(mLeftDragger); |
| |
| mRightDragger = ViewDragHelper.create(this, TOUCH_SLOP_SENSITIVITY, mRightCallback); |
| mRightDragger.setEdgeTrackingEnabled(ViewDragHelper.EDGE_RIGHT); |
| mRightDragger.setMinVelocity(minVel); |
| mRightCallback.setDragger(mRightDragger); |
| |
| // So that we can catch the back button |
| setFocusableInTouchMode(true); |
| |
| ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate()); |
| ViewGroupCompat.setMotionEventSplittingEnabled(this, false); |
| } |
| |
| /** |
| * Set a simple drawable used for the left or right shadow. |
| * The drawable provided must have a nonzero intrinsic width. |
| * |
| * @param shadowDrawable Shadow drawable to use at the edge of a drawer |
| * @param gravity Which drawer the shadow should apply to |
| */ |
| public void setDrawerShadow(Drawable shadowDrawable, int gravity) { |
| /* |
| * TODO Someone someday might want to set more complex drawables here. |
| * They're probably nuts, but we might want to consider registering callbacks, |
| * setting states, etc. properly. |
| */ |
| |
| final int absGravity = GravityCompat.getAbsoluteGravity(gravity, |
| ViewCompat.getLayoutDirection(this)); |
| if ((absGravity & Gravity.LEFT) == Gravity.LEFT) { |
| mShadowLeft = shadowDrawable; |
| invalidate(); |
| } |
| if ((absGravity & Gravity.RIGHT) == Gravity.RIGHT) { |
| mShadowRight = shadowDrawable; |
| invalidate(); |
| } |
| } |
| |
| /** |
| * Set a simple drawable used for the left or right shadow. |
| * The drawable provided must have a nonzero intrinsic width. |
| * |
| * @param resId Resource id of a shadow drawable to use at the edge of a drawer |
| * @param gravity Which drawer the shadow should apply to |
| */ |
| public void setDrawerShadow(int resId, int gravity) { |
| setDrawerShadow(getResources().getDrawable(resId), gravity); |
| } |
| |
| /** |
| * Set a color to use for the scrim that obscures primary content while a drawer is open. |
| * |
| * @param color Color to use in 0xAARRGGBB format. |
| */ |
| public void setScrimColor(int color) { |
| mScrimColor = color; |
| invalidate(); |
| } |
| |
| /** |
| * Set a listener to be notified of drawer events. |
| * |
| * @param listener Listener to notify when drawer events occur |
| * @see DrawerListener |
| */ |
| public void setDrawerListener(DrawerListener listener) { |
| mListener = listener; |
| } |
| |
| /** |
| * Enable or disable interaction with all drawers. |
| * |
| * <p>This allows the application to restrict the user's ability to open or close |
| * any drawer within this layout. DrawerLayout will still respond to calls to |
| * {@link #openDrawer(int)}, {@link #closeDrawer(int)} and friends if a drawer is locked.</p> |
| * |
| * <p>Locking drawers open or closed will implicitly open or close |
| * any drawers as appropriate.</p> |
| * |
| * @param lockMode The new lock mode for the given drawer. One of {@link #LOCK_MODE_UNLOCKED}, |
| * {@link #LOCK_MODE_LOCKED_CLOSED} or {@link #LOCK_MODE_LOCKED_OPEN}. |
| */ |
| public void setDrawerLockMode(int lockMode) { |
| setDrawerLockMode(lockMode, Gravity.LEFT); |
| setDrawerLockMode(lockMode, Gravity.RIGHT); |
| } |
| |
| /** |
| * Enable or disable interaction with the given drawer. |
| * |
| * <p>This allows the application to restrict the user's ability to open or close |
| * the given drawer. DrawerLayout will still respond to calls to {@link #openDrawer(int)}, |
| * {@link #closeDrawer(int)} and friends if a drawer is locked.</p> |
| * |
| * <p>Locking a drawer open or closed will implicitly open or close |
| * that drawer as appropriate.</p> |
| * |
| * @param lockMode The new lock mode for the given drawer. One of {@link #LOCK_MODE_UNLOCKED}, |
| * {@link #LOCK_MODE_LOCKED_CLOSED} or {@link #LOCK_MODE_LOCKED_OPEN}. |
| * @param edgeGravity Gravity.LEFT, RIGHT, START or END. |
| * Expresses which drawer to change the mode for. |
| * |
| * @see #LOCK_MODE_UNLOCKED |
| * @see #LOCK_MODE_LOCKED_CLOSED |
| * @see #LOCK_MODE_LOCKED_OPEN |
| */ |
| public void setDrawerLockMode(int lockMode, int edgeGravity) { |
| final int absGravity = GravityCompat.getAbsoluteGravity(edgeGravity, |
| ViewCompat.getLayoutDirection(this)); |
| if (absGravity == Gravity.LEFT) { |
| mLockModeLeft = lockMode; |
| } else if (absGravity == Gravity.RIGHT) { |
| mLockModeRight = lockMode; |
| } |
| if (lockMode != LOCK_MODE_UNLOCKED) { |
| // Cancel interaction in progress |
| final ViewDragHelper helper = absGravity == Gravity.LEFT ? mLeftDragger : mRightDragger; |
| helper.cancel(); |
| } |
| switch (lockMode) { |
| case LOCK_MODE_LOCKED_OPEN: |
| final View toOpen = findDrawerWithGravity(absGravity); |
| if (toOpen != null) { |
| openDrawer(toOpen); |
| } |
| break; |
| case LOCK_MODE_LOCKED_CLOSED: |
| final View toClose = findDrawerWithGravity(absGravity); |
| if (toClose != null) { |
| closeDrawer(toClose); |
| } |
| break; |
| // default: do nothing |
| } |
| } |
| |
| /** |
| * Enable or disable interaction with the given drawer. |
| * |
| * <p>This allows the application to restrict the user's ability to open or close |
| * the given drawer. DrawerLayout will still respond to calls to {@link #openDrawer(int)}, |
| * {@link #closeDrawer(int)} and friends if a drawer is locked.</p> |
| * |
| * <p>Locking a drawer open or closed will implicitly open or close |
| * that drawer as appropriate.</p> |
| * |
| * @param lockMode The new lock mode for the given drawer. One of {@link #LOCK_MODE_UNLOCKED}, |
| * {@link #LOCK_MODE_LOCKED_CLOSED} or {@link #LOCK_MODE_LOCKED_OPEN}. |
| * @param drawerView The drawer view to change the lock mode for |
| * |
| * @see #LOCK_MODE_UNLOCKED |
| * @see #LOCK_MODE_LOCKED_CLOSED |
| * @see #LOCK_MODE_LOCKED_OPEN |
| */ |
| public void setDrawerLockMode(int lockMode, View drawerView) { |
| if (!isDrawerView(drawerView)) { |
| throw new IllegalArgumentException("View " + drawerView + " is not a " + |
| "drawer with appropriate layout_gravity"); |
| } |
| final int gravity = ((LayoutParams) drawerView.getLayoutParams()).gravity; |
| setDrawerLockMode(lockMode, gravity); |
| } |
| |
| /** |
| * Check the lock mode of the drawer with the given gravity. |
| * |
| * @param edgeGravity Gravity of the drawer to check |
| * @return one of {@link #LOCK_MODE_UNLOCKED}, {@link #LOCK_MODE_LOCKED_CLOSED} or |
| * {@link #LOCK_MODE_LOCKED_OPEN}. |
| */ |
| public int getDrawerLockMode(int edgeGravity) { |
| final int absGravity = GravityCompat.getAbsoluteGravity( |
| edgeGravity, ViewCompat.getLayoutDirection(this)); |
| if (absGravity == Gravity.LEFT) { |
| return mLockModeLeft; |
| } else if (absGravity == Gravity.RIGHT) { |
| return mLockModeRight; |
| } |
| return LOCK_MODE_UNLOCKED; |
| } |
| |
| /** |
| * Check the lock mode of the given drawer view. |
| * |
| * @param drawerView Drawer view to check lock mode |
| * @return one of {@link #LOCK_MODE_UNLOCKED}, {@link #LOCK_MODE_LOCKED_CLOSED} or |
| * {@link #LOCK_MODE_LOCKED_OPEN}. |
| */ |
| public int getDrawerLockMode(View drawerView) { |
| final int absGravity = getDrawerViewAbsoluteGravity(drawerView); |
| if (absGravity == Gravity.LEFT) { |
| return mLockModeLeft; |
| } else if (absGravity == Gravity.RIGHT) { |
| return mLockModeRight; |
| } |
| return LOCK_MODE_UNLOCKED; |
| } |
| |
| /** |
| * Resolve the shared state of all drawers from the component ViewDragHelpers. |
| * Should be called whenever a ViewDragHelper's state changes. |
| */ |
| void updateDrawerState(int forGravity, int activeState, View activeDrawer) { |
| final int leftState = mLeftDragger.getViewDragState(); |
| final int rightState = mRightDragger.getViewDragState(); |
| |
| final int state; |
| if (leftState == STATE_DRAGGING || rightState == STATE_DRAGGING) { |
| state = STATE_DRAGGING; |
| } else if (leftState == STATE_SETTLING || rightState == STATE_SETTLING) { |
| state = STATE_SETTLING; |
| } else { |
| state = STATE_IDLE; |
| } |
| |
| if (activeDrawer != null && activeState == STATE_IDLE) { |
| final LayoutParams lp = (LayoutParams) activeDrawer.getLayoutParams(); |
| if (lp.onScreen == 0) { |
| dispatchOnDrawerClosed(activeDrawer); |
| } else if (lp.onScreen == 1) { |
| dispatchOnDrawerOpened(activeDrawer); |
| } |
| } |
| |
| if (state != mDrawerState) { |
| mDrawerState = state; |
| |
| if (mListener != null) { |
| mListener.onDrawerStateChanged(state); |
| } |
| } |
| } |
| |
| void dispatchOnDrawerClosed(View drawerView) { |
| final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams(); |
| if (lp.knownOpen) { |
| lp.knownOpen = false; |
| if (mListener != null) { |
| mListener.onDrawerClosed(drawerView); |
| } |
| sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED); |
| } |
| } |
| |
| void dispatchOnDrawerOpened(View drawerView) { |
| final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams(); |
| if (!lp.knownOpen) { |
| lp.knownOpen = true; |
| if (mListener != null) { |
| mListener.onDrawerOpened(drawerView); |
| } |
| drawerView.sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED); |
| } |
| } |
| |
| void dispatchOnDrawerSlide(View drawerView, float slideOffset) { |
| if (mListener != null) { |
| mListener.onDrawerSlide(drawerView, slideOffset); |
| } |
| } |
| |
| void setDrawerViewOffset(View drawerView, float slideOffset) { |
| final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams(); |
| if (slideOffset == lp.onScreen) { |
| return; |
| } |
| |
| lp.onScreen = slideOffset; |
| dispatchOnDrawerSlide(drawerView, slideOffset); |
| } |
| |
| float getDrawerViewOffset(View drawerView) { |
| return ((LayoutParams) drawerView.getLayoutParams()).onScreen; |
| } |
| |
| /** |
| * @return the absolute gravity of the child drawerView, resolved according |
| * to the current layout direction |
| */ |
| int getDrawerViewAbsoluteGravity(View drawerView) { |
| final int gravity = ((LayoutParams) drawerView.getLayoutParams()).gravity; |
| return GravityCompat.getAbsoluteGravity(gravity, ViewCompat.getLayoutDirection(this)); |
| } |
| |
| boolean checkDrawerViewAbsoluteGravity(View drawerView, int checkFor) { |
| final int absGravity = getDrawerViewAbsoluteGravity(drawerView); |
| return (absGravity & checkFor) == checkFor; |
| } |
| |
| View findOpenDrawer() { |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| if (((LayoutParams) child.getLayoutParams()).knownOpen) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| void moveDrawerToOffset(View drawerView, float slideOffset) { |
| final float oldOffset = getDrawerViewOffset(drawerView); |
| final int width = drawerView.getWidth(); |
| final int oldPos = (int) (width * oldOffset); |
| final int newPos = (int) (width * slideOffset); |
| final int dx = newPos - oldPos; |
| |
| drawerView.offsetLeftAndRight( |
| checkDrawerViewAbsoluteGravity(drawerView, Gravity.LEFT) ? dx : -dx); |
| setDrawerViewOffset(drawerView, slideOffset); |
| } |
| |
| /** |
| * @param gravity the gravity of the child to return. If specified as a |
| * relative value, it will be resolved according to the current |
| * layout direction. |
| * @return the drawer with the specified gravity |
| */ |
| View findDrawerWithGravity(int gravity) { |
| final int absHorizGravity = GravityCompat.getAbsoluteGravity( |
| gravity, ViewCompat.getLayoutDirection(this)) & Gravity.HORIZONTAL_GRAVITY_MASK; |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| final int childAbsGravity = getDrawerViewAbsoluteGravity(child); |
| if ((childAbsGravity & Gravity.HORIZONTAL_GRAVITY_MASK) == absHorizGravity) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Simple gravity to string - only supports LEFT and RIGHT for debugging output. |
| * |
| * @param gravity Absolute gravity value |
| * @return LEFT or RIGHT as appropriate, or a hex string |
| */ |
| static String gravityToString(int gravity) { |
| if ((gravity & Gravity.LEFT) == Gravity.LEFT) { |
| return "LEFT"; |
| } |
| if ((gravity & Gravity.RIGHT) == Gravity.RIGHT) { |
| return "RIGHT"; |
| } |
| return Integer.toHexString(gravity); |
| } |
| |
| @Override |
| protected void onDetachedFromWindow() { |
| super.onDetachedFromWindow(); |
| mFirstLayout = true; |
| } |
| |
| @Override |
| protected void onAttachedToWindow() { |
| super.onAttachedToWindow(); |
| mFirstLayout = true; |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| |
| if (widthMode != MeasureSpec.EXACTLY || heightMode != MeasureSpec.EXACTLY) { |
| if (isInEditMode()) { |
| // Don't crash the layout editor. Consume all of the space if specified |
| // or pick a magic number from thin air otherwise. |
| // TODO Better communication with tools of this bogus state. |
| // It will crash on a real device. |
| if (widthMode == MeasureSpec.AT_MOST) { |
| widthMode = MeasureSpec.EXACTLY; |
| } else if (widthMode == MeasureSpec.UNSPECIFIED) { |
| widthMode = MeasureSpec.EXACTLY; |
| widthSize = 300; |
| } |
| if (heightMode == MeasureSpec.AT_MOST) { |
| heightMode = MeasureSpec.EXACTLY; |
| } |
| else if (heightMode == MeasureSpec.UNSPECIFIED) { |
| heightMode = MeasureSpec.EXACTLY; |
| heightSize = 300; |
| } |
| } else { |
| throw new IllegalArgumentException( |
| "DrawerLayout must be measured with MeasureSpec.EXACTLY."); |
| } |
| } |
| |
| setMeasuredDimension(widthSize, heightSize); |
| |
| // Gravity value for each drawer we've seen. Only one of each permitted. |
| int foundDrawers = 0; |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| |
| if (child.getVisibility() == GONE) { |
| continue; |
| } |
| |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| |
| if (isContentView(child)) { |
| // Content views get measured at exactly the layout's size. |
| final int contentWidthSpec = MeasureSpec.makeMeasureSpec( |
| widthSize - lp.leftMargin - lp.rightMargin, MeasureSpec.EXACTLY); |
| final int contentHeightSpec = MeasureSpec.makeMeasureSpec( |
| heightSize - lp.topMargin - lp.bottomMargin, MeasureSpec.EXACTLY); |
| child.measure(contentWidthSpec, contentHeightSpec); |
| } else if (isDrawerView(child)) { |
| final int childGravity = |
| getDrawerViewAbsoluteGravity(child) & Gravity.HORIZONTAL_GRAVITY_MASK; |
| if ((foundDrawers & childGravity) != 0) { |
| throw new IllegalStateException("Child drawer has absolute gravity " + |
| gravityToString(childGravity) + " but this " + TAG + " already has a " + |
| "drawer view along that edge"); |
| } |
| final int drawerWidthSpec = getChildMeasureSpec(widthMeasureSpec, |
| mMinDrawerMargin + lp.leftMargin + lp.rightMargin, |
| lp.width); |
| final int drawerHeightSpec = getChildMeasureSpec(heightMeasureSpec, |
| lp.topMargin + lp.bottomMargin, |
| lp.height); |
| child.measure(drawerWidthSpec, drawerHeightSpec); |
| } else { |
| throw new IllegalStateException("Child " + child + " at index " + i + |
| " does not have a valid layout_gravity - must be Gravity.LEFT, " + |
| "Gravity.RIGHT or Gravity.NO_GRAVITY"); |
| } |
| } |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| mInLayout = true; |
| final int width = r - l; |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| |
| if (child.getVisibility() == GONE) { |
| continue; |
| } |
| |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| |
| if (isContentView(child)) { |
| child.layout(lp.leftMargin, lp.topMargin, |
| lp.leftMargin + child.getMeasuredWidth(), |
| lp.topMargin + child.getMeasuredHeight()); |
| } else { // Drawer, if it wasn't onMeasure would have thrown an exception. |
| final int childWidth = child.getMeasuredWidth(); |
| final int childHeight = child.getMeasuredHeight(); |
| int childLeft; |
| |
| final float newOffset; |
| if (checkDrawerViewAbsoluteGravity(child, Gravity.LEFT)) { |
| childLeft = -childWidth + (int) (childWidth * lp.onScreen); |
| newOffset = (float) (childWidth + childLeft) / childWidth; |
| } else { // Right; onMeasure checked for us. |
| childLeft = width - (int) (childWidth * lp.onScreen); |
| newOffset = (float) (width - childLeft) / childWidth; |
| } |
| |
| final boolean changeOffset = newOffset != lp.onScreen; |
| |
| final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK; |
| |
| switch (vgrav) { |
| default: |
| case Gravity.TOP: { |
| child.layout(childLeft, lp.topMargin, childLeft + childWidth, |
| lp.topMargin + childHeight); |
| break; |
| } |
| |
| case Gravity.BOTTOM: { |
| final int height = b - t; |
| child.layout(childLeft, |
| height - lp.bottomMargin - child.getMeasuredHeight(), |
| childLeft + childWidth, |
| height - lp.bottomMargin); |
| break; |
| } |
| |
| case Gravity.CENTER_VERTICAL: { |
| final int height = b - t; |
| int childTop = (height - childHeight) / 2; |
| |
| // Offset for margins. If things don't fit right because of |
| // bad measurement before, oh well. |
| if (childTop < lp.topMargin) { |
| childTop = lp.topMargin; |
| } else if (childTop + childHeight > height - lp.bottomMargin) { |
| childTop = height - lp.bottomMargin - childHeight; |
| } |
| child.layout(childLeft, childTop, childLeft + childWidth, |
| childTop + childHeight); |
| break; |
| } |
| } |
| |
| if (changeOffset) { |
| setDrawerViewOffset(child, newOffset); |
| } |
| |
| final int newVisibility = lp.onScreen > 0 ? VISIBLE : INVISIBLE; |
| if (child.getVisibility() != newVisibility) { |
| child.setVisibility(newVisibility); |
| } |
| } |
| } |
| mInLayout = false; |
| mFirstLayout = false; |
| } |
| |
| @Override |
| public void requestLayout() { |
| if (!mInLayout) { |
| super.requestLayout(); |
| } |
| } |
| |
| @Override |
| public void computeScroll() { |
| final int childCount = getChildCount(); |
| float scrimOpacity = 0; |
| for (int i = 0; i < childCount; i++) { |
| final float onscreen = ((LayoutParams) getChildAt(i).getLayoutParams()).onScreen; |
| scrimOpacity = Math.max(scrimOpacity, onscreen); |
| } |
| mScrimOpacity = scrimOpacity; |
| |
| // "|" used on purpose; both need to run. |
| if (mLeftDragger.continueSettling(true) | mRightDragger.continueSettling(true)) { |
| ViewCompat.postInvalidateOnAnimation(this); |
| } |
| } |
| |
| private static boolean hasOpaqueBackground(View v) { |
| final Drawable bg = v.getBackground(); |
| if (bg != null) { |
| return bg.getOpacity() == PixelFormat.OPAQUE; |
| } |
| return false; |
| } |
| |
| @Override |
| protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| final int height = getHeight(); |
| final boolean drawingContent = isContentView(child); |
| int clipLeft = 0, clipRight = getWidth(); |
| |
| final int restoreCount = canvas.save(); |
| if (drawingContent) { |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View v = getChildAt(i); |
| if (v == child || v.getVisibility() != VISIBLE || |
| !hasOpaqueBackground(v) || !isDrawerView(v) || |
| v.getHeight() < height) { |
| continue; |
| } |
| |
| if (checkDrawerViewAbsoluteGravity(v, Gravity.LEFT)) { |
| final int vright = v.getRight(); |
| if (vright > clipLeft) clipLeft = vright; |
| } else { |
| final int vleft = v.getLeft(); |
| if (vleft < clipRight) clipRight = vleft; |
| } |
| } |
| canvas.clipRect(clipLeft, 0, clipRight, getHeight()); |
| } |
| final boolean result = super.drawChild(canvas, child, drawingTime); |
| canvas.restoreToCount(restoreCount); |
| |
| if (mScrimOpacity > 0 && drawingContent) { |
| final int baseAlpha = (mScrimColor & 0xff000000) >>> 24; |
| final int imag = (int) (baseAlpha * mScrimOpacity); |
| final int color = imag << 24 | (mScrimColor & 0xffffff); |
| mScrimPaint.setColor(color); |
| |
| canvas.drawRect(clipLeft, 0, clipRight, getHeight(), mScrimPaint); |
| } else if (mShadowLeft != null && checkDrawerViewAbsoluteGravity(child, Gravity.LEFT)) { |
| final int shadowWidth = mShadowLeft.getIntrinsicWidth(); |
| final int childRight = child.getRight(); |
| final int drawerPeekDistance = mLeftDragger.getEdgeSize(); |
| final float alpha = |
| Math.max(0, Math.min((float) childRight / drawerPeekDistance, 1.f)); |
| mShadowLeft.setBounds(childRight, child.getTop(), |
| childRight + shadowWidth, child.getBottom()); |
| mShadowLeft.setAlpha((int) (0xff * alpha)); |
| mShadowLeft.draw(canvas); |
| } else if (mShadowRight != null && checkDrawerViewAbsoluteGravity(child, Gravity.RIGHT)) { |
| final int shadowWidth = mShadowRight.getIntrinsicWidth(); |
| final int childLeft = child.getLeft(); |
| final int showing = getWidth() - childLeft; |
| final int drawerPeekDistance = mRightDragger.getEdgeSize(); |
| final float alpha = |
| Math.max(0, Math.min((float) showing / drawerPeekDistance, 1.f)); |
| mShadowRight.setBounds(childLeft - shadowWidth, child.getTop(), |
| childLeft, child.getBottom()); |
| mShadowRight.setAlpha((int) (0xff * alpha)); |
| mShadowRight.draw(canvas); |
| } |
| return result; |
| } |
| |
| boolean isContentView(View child) { |
| return ((LayoutParams) child.getLayoutParams()).gravity == Gravity.NO_GRAVITY; |
| } |
| |
| boolean isDrawerView(View child) { |
| final int gravity = ((LayoutParams) child.getLayoutParams()).gravity; |
| final int absGravity = GravityCompat.getAbsoluteGravity(gravity, |
| ViewCompat.getLayoutDirection(child)); |
| return (absGravity & (Gravity.LEFT | Gravity.RIGHT)) != 0; |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(MotionEvent ev) { |
| final int action = MotionEventCompat.getActionMasked(ev); |
| |
| // "|" used deliberately here; both methods should be invoked. |
| final boolean interceptForDrag = mLeftDragger.shouldInterceptTouchEvent(ev) | |
| mRightDragger.shouldInterceptTouchEvent(ev); |
| |
| boolean interceptForTap = false; |
| |
| switch (action) { |
| case MotionEvent.ACTION_DOWN: { |
| final float x = ev.getX(); |
| final float y = ev.getY(); |
| mInitialMotionX = x; |
| mInitialMotionY = y; |
| if (mScrimOpacity > 0 && |
| isContentView(mLeftDragger.findTopChildUnder((int) x, (int) y))) { |
| interceptForTap = true; |
| } |
| mDisallowInterceptRequested = false; |
| mChildrenCanceledTouch = false; |
| break; |
| } |
| |
| case MotionEvent.ACTION_MOVE: { |
| // If we cross the touch slop, don't perform the delayed peek for an edge touch. |
| if (mLeftDragger.checkTouchSlop(ViewDragHelper.DIRECTION_ALL)) { |
| mLeftCallback.removeCallbacks(); |
| mRightCallback.removeCallbacks(); |
| } |
| break; |
| } |
| |
| case MotionEvent.ACTION_CANCEL: |
| case MotionEvent.ACTION_UP: { |
| closeDrawers(true); |
| mDisallowInterceptRequested = false; |
| mChildrenCanceledTouch = false; |
| } |
| } |
| |
| return interceptForDrag || interceptForTap || hasPeekingDrawer() || mChildrenCanceledTouch; |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| mLeftDragger.processTouchEvent(ev); |
| mRightDragger.processTouchEvent(ev); |
| |
| final int action = ev.getAction(); |
| boolean wantTouchEvents = true; |
| |
| switch (action & MotionEventCompat.ACTION_MASK) { |
| case MotionEvent.ACTION_DOWN: { |
| final float x = ev.getX(); |
| final float y = ev.getY(); |
| mInitialMotionX = x; |
| mInitialMotionY = y; |
| mDisallowInterceptRequested = false; |
| mChildrenCanceledTouch = false; |
| break; |
| } |
| |
| case MotionEvent.ACTION_UP: { |
| final float x = ev.getX(); |
| final float y = ev.getY(); |
| boolean peekingOnly = true; |
| final View touchedView = mLeftDragger.findTopChildUnder((int) x, (int) y); |
| if (touchedView != null && isContentView(touchedView)) { |
| final float dx = x - mInitialMotionX; |
| final float dy = y - mInitialMotionY; |
| final int slop = mLeftDragger.getTouchSlop(); |
| if (dx * dx + dy * dy < slop * slop) { |
| // Taps close a dimmed open drawer but only if it isn't locked open. |
| final View openDrawer = findOpenDrawer(); |
| if (openDrawer != null) { |
| peekingOnly = getDrawerLockMode(openDrawer) == LOCK_MODE_LOCKED_OPEN; |
| } |
| } |
| } |
| closeDrawers(peekingOnly); |
| mDisallowInterceptRequested = false; |
| break; |
| } |
| |
| case MotionEvent.ACTION_CANCEL: { |
| closeDrawers(true); |
| mDisallowInterceptRequested = false; |
| mChildrenCanceledTouch = false; |
| break; |
| } |
| } |
| |
| return wantTouchEvents; |
| } |
| |
| public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { |
| if (CHILDREN_DISALLOW_INTERCEPT || |
| (!mLeftDragger.isEdgeTouched(ViewDragHelper.EDGE_LEFT) && |
| !mRightDragger.isEdgeTouched(ViewDragHelper.EDGE_RIGHT))) { |
| // If we have an edge touch we want to skip this and track it for later instead. |
| super.requestDisallowInterceptTouchEvent(disallowIntercept); |
| } |
| mDisallowInterceptRequested = disallowIntercept; |
| if (disallowIntercept) { |
| closeDrawers(true); |
| } |
| } |
| |
| /** |
| * Close all currently open drawer views by animating them out of view. |
| */ |
| public void closeDrawers() { |
| closeDrawers(false); |
| } |
| |
| void closeDrawers(boolean peekingOnly) { |
| boolean needsInvalidate = false; |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| |
| if (!isDrawerView(child) || (peekingOnly && !lp.isPeeking)) { |
| continue; |
| } |
| |
| final int childWidth = child.getWidth(); |
| |
| if (checkDrawerViewAbsoluteGravity(child, Gravity.LEFT)) { |
| needsInvalidate |= mLeftDragger.smoothSlideViewTo(child, |
| -childWidth, child.getTop()); |
| } else { |
| needsInvalidate |= mRightDragger.smoothSlideViewTo(child, |
| getWidth(), child.getTop()); |
| } |
| |
| lp.isPeeking = false; |
| } |
| |
| mLeftCallback.removeCallbacks(); |
| mRightCallback.removeCallbacks(); |
| |
| if (needsInvalidate) { |
| invalidate(); |
| } |
| } |
| |
| /** |
| * Open the specified drawer view by animating it into view. |
| * |
| * @param drawerView Drawer view to open |
| */ |
| public void openDrawer(View drawerView) { |
| if (!isDrawerView(drawerView)) { |
| throw new IllegalArgumentException("View " + drawerView + " is not a sliding drawer"); |
| } |
| |
| if (mFirstLayout) { |
| final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams(); |
| lp.onScreen = 1.f; |
| lp.knownOpen = true; |
| } else { |
| if (checkDrawerViewAbsoluteGravity(drawerView, Gravity.LEFT)) { |
| mLeftDragger.smoothSlideViewTo(drawerView, 0, drawerView.getTop()); |
| } else { |
| mRightDragger.smoothSlideViewTo(drawerView, getWidth() - drawerView.getWidth(), |
| drawerView.getTop()); |
| } |
| } |
| invalidate(); |
| } |
| |
| /** |
| * Open the specified drawer by animating it out of view. |
| * |
| * @param gravity Gravity.LEFT to move the left drawer or Gravity.RIGHT for the right. |
| * GravityCompat.START or GravityCompat.END may also be used. |
| */ |
| public void openDrawer(int gravity) { |
| final View drawerView = findDrawerWithGravity(gravity); |
| if (drawerView == null) { |
| throw new IllegalArgumentException("No drawer view found with gravity " + |
| gravityToString(gravity)); |
| } |
| openDrawer(drawerView); |
| } |
| |
| /** |
| * Close the specified drawer view by animating it into view. |
| * |
| * @param drawerView Drawer view to close |
| */ |
| public void closeDrawer(View drawerView) { |
| if (!isDrawerView(drawerView)) { |
| throw new IllegalArgumentException("View " + drawerView + " is not a sliding drawer"); |
| } |
| |
| if (mFirstLayout) { |
| final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams(); |
| lp.onScreen = 0.f; |
| lp.knownOpen = false; |
| } else { |
| if (checkDrawerViewAbsoluteGravity(drawerView, Gravity.LEFT)) { |
| mLeftDragger.smoothSlideViewTo(drawerView, -drawerView.getWidth(), |
| drawerView.getTop()); |
| } else { |
| mRightDragger.smoothSlideViewTo(drawerView, getWidth(), drawerView.getTop()); |
| } |
| } |
| invalidate(); |
| } |
| |
| /** |
| * Close the specified drawer by animating it out of view. |
| * |
| * @param gravity Gravity.LEFT to move the left drawer or Gravity.RIGHT for the right. |
| * GravityCompat.START or GravityCompat.END may also be used. |
| */ |
| public void closeDrawer(int gravity) { |
| final View drawerView = findDrawerWithGravity(gravity); |
| if (drawerView == null) { |
| throw new IllegalArgumentException("No drawer view found with gravity " + |
| gravityToString(gravity)); |
| } |
| closeDrawer(drawerView); |
| } |
| |
| /** |
| * Check if the given drawer view is currently in an open state. |
| * To be considered "open" the drawer must have settled into its fully |
| * visible state. To check for partial visibility use |
| * {@link #isDrawerVisible(android.view.View)}. |
| * |
| * @param drawer Drawer view to check |
| * @return true if the given drawer view is in an open state |
| * @see #isDrawerVisible(android.view.View) |
| */ |
| public boolean isDrawerOpen(View drawer) { |
| if (!isDrawerView(drawer)) { |
| throw new IllegalArgumentException("View " + drawer + " is not a drawer"); |
| } |
| return ((LayoutParams) drawer.getLayoutParams()).knownOpen; |
| } |
| |
| /** |
| * Check if the given drawer view is currently in an open state. |
| * To be considered "open" the drawer must have settled into its fully |
| * visible state. If there is no drawer with the given gravity this method |
| * will return false. |
| * |
| * @param drawerGravity Gravity of the drawer to check |
| * @return true if the given drawer view is in an open state |
| */ |
| public boolean isDrawerOpen(int drawerGravity) { |
| final View drawerView = findDrawerWithGravity(drawerGravity); |
| if (drawerView != null) { |
| return isDrawerOpen(drawerView); |
| } |
| return false; |
| } |
| |
| /** |
| * Check if a given drawer view is currently visible on-screen. The drawer |
| * may be only peeking onto the screen, fully extended, or anywhere inbetween. |
| * |
| * @param drawer Drawer view to check |
| * @return true if the given drawer is visible on-screen |
| * @see #isDrawerOpen(android.view.View) |
| */ |
| public boolean isDrawerVisible(View drawer) { |
| if (!isDrawerView(drawer)) { |
| throw new IllegalArgumentException("View " + drawer + " is not a drawer"); |
| } |
| return ((LayoutParams) drawer.getLayoutParams()).onScreen > 0; |
| } |
| |
| /** |
| * Check if a given drawer view is currently visible on-screen. The drawer |
| * may be only peeking onto the screen, fully extended, or anywhere inbetween. |
| * If there is no drawer with the given gravity this method will return false. |
| * |
| * @param drawerGravity Gravity of the drawer to check |
| * @return true if the given drawer is visible on-screen |
| */ |
| public boolean isDrawerVisible(int drawerGravity) { |
| final View drawerView = findDrawerWithGravity(drawerGravity); |
| if (drawerView != null) { |
| return isDrawerVisible(drawerView); |
| } |
| return false; |
| } |
| |
| private boolean hasPeekingDrawer() { |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final LayoutParams lp = (LayoutParams) getChildAt(i).getLayoutParams(); |
| if (lp.isPeeking) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| protected ViewGroup.LayoutParams generateDefaultLayoutParams() { |
| return new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); |
| } |
| |
| @Override |
| protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| return p instanceof LayoutParams |
| ? new LayoutParams((LayoutParams) p) |
| : p instanceof ViewGroup.MarginLayoutParams |
| ? new LayoutParams((MarginLayoutParams) p) |
| : new LayoutParams(p); |
| } |
| |
| @Override |
| protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| return p instanceof LayoutParams && super.checkLayoutParams(p); |
| } |
| |
| @Override |
| public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { |
| return new LayoutParams(getContext(), attrs); |
| } |
| |
| private boolean hasVisibleDrawer() { |
| return findVisibleDrawer() != null; |
| } |
| |
| private View findVisibleDrawer() { |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| if (isDrawerView(child) && isDrawerVisible(child)) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| void cancelChildViewTouch() { |
| // Cancel child touches |
| if (!mChildrenCanceledTouch) { |
| final long now = SystemClock.uptimeMillis(); |
| final MotionEvent cancelEvent = MotionEvent.obtain(now, now, |
| MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| getChildAt(i).dispatchTouchEvent(cancelEvent); |
| } |
| cancelEvent.recycle(); |
| mChildrenCanceledTouch = true; |
| } |
| } |
| |
| @Override |
| public boolean onKeyDown(int keyCode, KeyEvent event) { |
| if (keyCode == KeyEvent.KEYCODE_BACK && hasVisibleDrawer()) { |
| KeyEventCompat.startTracking(event); |
| return true; |
| } |
| return super.onKeyDown(keyCode, event); |
| } |
| |
| @Override |
| public boolean onKeyUp(int keyCode, KeyEvent event) { |
| if (keyCode == KeyEvent.KEYCODE_BACK) { |
| final View visibleDrawer = findVisibleDrawer(); |
| if (visibleDrawer != null && getDrawerLockMode(visibleDrawer) == LOCK_MODE_UNLOCKED) { |
| closeDrawers(); |
| } |
| return visibleDrawer != null; |
| } |
| return super.onKeyUp(keyCode, event); |
| } |
| |
| @Override |
| protected void onRestoreInstanceState(Parcelable state) { |
| final SavedState ss = (SavedState) state; |
| super.onRestoreInstanceState(ss.getSuperState()); |
| |
| if (ss.openDrawerGravity != Gravity.NO_GRAVITY) { |
| final View toOpen = findDrawerWithGravity(ss.openDrawerGravity); |
| if (toOpen != null) { |
| openDrawer(toOpen); |
| } |
| } |
| |
| setDrawerLockMode(ss.lockModeLeft, Gravity.LEFT); |
| setDrawerLockMode(ss.lockModeRight, Gravity.RIGHT); |
| } |
| |
| @Override |
| protected Parcelable onSaveInstanceState() { |
| final Parcelable superState = super.onSaveInstanceState(); |
| |
| final SavedState ss = new SavedState(superState); |
| |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| if (!isDrawerView(child)) { |
| continue; |
| } |
| |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| if (lp.knownOpen) { |
| ss.openDrawerGravity = lp.gravity; |
| // Only one drawer can be open at a time. |
| break; |
| } |
| } |
| |
| ss.lockModeLeft = mLockModeLeft; |
| ss.lockModeRight = mLockModeRight; |
| |
| return ss; |
| } |
| |
| /** |
| * State persisted across instances |
| */ |
| protected static class SavedState extends BaseSavedState { |
| int openDrawerGravity = Gravity.NO_GRAVITY; |
| int lockModeLeft = LOCK_MODE_UNLOCKED; |
| int lockModeRight = LOCK_MODE_UNLOCKED; |
| |
| public SavedState(Parcel in) { |
| super(in); |
| openDrawerGravity = in.readInt(); |
| } |
| |
| public SavedState(Parcelable superState) { |
| super(superState); |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| super.writeToParcel(dest, flags); |
| dest.writeInt(openDrawerGravity); |
| } |
| |
| public static final Parcelable.Creator<SavedState> CREATOR = |
| new Parcelable.Creator<SavedState>() { |
| @Override |
| public SavedState createFromParcel(Parcel source) { |
| return new SavedState(source); |
| } |
| |
| @Override |
| public SavedState[] newArray(int size) { |
| return new SavedState[size]; |
| } |
| }; |
| } |
| |
| private class ViewDragCallback extends ViewDragHelper.Callback { |
| private final int mAbsGravity; |
| private ViewDragHelper mDragger; |
| |
| private final Runnable mPeekRunnable = new Runnable() { |
| @Override public void run() { |
| peekDrawer(); |
| } |
| }; |
| |
| public ViewDragCallback(int gravity) { |
| mAbsGravity = gravity; |
| } |
| |
| public void setDragger(ViewDragHelper dragger) { |
| mDragger = dragger; |
| } |
| |
| public void removeCallbacks() { |
| DrawerLayout.this.removeCallbacks(mPeekRunnable); |
| } |
| |
| @Override |
| public boolean tryCaptureView(View child, int pointerId) { |
| // Only capture views where the gravity matches what we're looking for. |
| // This lets us use two ViewDragHelpers, one for each side drawer. |
| return isDrawerView(child) && checkDrawerViewAbsoluteGravity(child, mAbsGravity) |
| && getDrawerLockMode(child) == LOCK_MODE_UNLOCKED; |
| } |
| |
| @Override |
| public void onViewDragStateChanged(int state) { |
| updateDrawerState(mAbsGravity, state, mDragger.getCapturedView()); |
| } |
| |
| @Override |
| public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { |
| float offset; |
| final int childWidth = changedView.getWidth(); |
| |
| // This reverses the positioning shown in onLayout. |
| if (checkDrawerViewAbsoluteGravity(changedView, Gravity.LEFT)) { |
| offset = (float) (childWidth + left) / childWidth; |
| } else { |
| final int width = getWidth(); |
| offset = (float) (width - left) / childWidth; |
| } |
| setDrawerViewOffset(changedView, offset); |
| changedView.setVisibility(offset == 0 ? INVISIBLE : VISIBLE); |
| invalidate(); |
| } |
| |
| @Override |
| public void onViewCaptured(View capturedChild, int activePointerId) { |
| final LayoutParams lp = (LayoutParams) capturedChild.getLayoutParams(); |
| lp.isPeeking = false; |
| |
| closeOtherDrawer(); |
| } |
| |
| private void closeOtherDrawer() { |
| final int otherGrav = mAbsGravity == Gravity.LEFT ? Gravity.RIGHT : Gravity.LEFT; |
| final View toClose = findDrawerWithGravity(otherGrav); |
| if (toClose != null) { |
| closeDrawer(toClose); |
| } |
| } |
| |
| @Override |
| public void onViewReleased(View releasedChild, float xvel, float yvel) { |
| // Offset is how open the drawer is, therefore left/right values |
| // are reversed from one another. |
| final float offset = getDrawerViewOffset(releasedChild); |
| final int childWidth = releasedChild.getWidth(); |
| |
| int left; |
| if (checkDrawerViewAbsoluteGravity(releasedChild, Gravity.LEFT)) { |
| left = xvel > 0 || xvel == 0 && offset > 0.5f ? 0 : -childWidth; |
| } else { |
| final int width = getWidth(); |
| left = xvel < 0 || xvel == 0 && offset > 0.5f ? width - childWidth : width; |
| } |
| |
| mDragger.settleCapturedViewAt(left, releasedChild.getTop()); |
| invalidate(); |
| } |
| |
| @Override |
| public void onEdgeTouched(int edgeFlags, int pointerId) { |
| postDelayed(mPeekRunnable, PEEK_DELAY); |
| } |
| |
| private void peekDrawer() { |
| final View toCapture; |
| final int childLeft; |
| final int peekDistance = mDragger.getEdgeSize(); |
| final boolean leftEdge = mAbsGravity == Gravity.LEFT; |
| if (leftEdge) { |
| toCapture = findDrawerWithGravity(Gravity.LEFT); |
| childLeft = (toCapture != null ? -toCapture.getWidth() : 0) + peekDistance; |
| } else { |
| toCapture = findDrawerWithGravity(Gravity.RIGHT); |
| childLeft = getWidth() - peekDistance; |
| } |
| // Only peek if it would mean making the drawer more visible and the drawer isn't locked |
| if (toCapture != null && ((leftEdge && toCapture.getLeft() < childLeft) || |
| (!leftEdge && toCapture.getLeft() > childLeft)) && |
| getDrawerLockMode(toCapture) == LOCK_MODE_UNLOCKED) { |
| final LayoutParams lp = (LayoutParams) toCapture.getLayoutParams(); |
| mDragger.smoothSlideViewTo(toCapture, childLeft, toCapture.getTop()); |
| lp.isPeeking = true; |
| invalidate(); |
| |
| closeOtherDrawer(); |
| |
| cancelChildViewTouch(); |
| } |
| } |
| |
| @Override |
| public boolean onEdgeLock(int edgeFlags) { |
| if (ALLOW_EDGE_LOCK) { |
| final View drawer = findDrawerWithGravity(mAbsGravity); |
| if (drawer != null && !isDrawerOpen(drawer)) { |
| closeDrawer(drawer); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public void onEdgeDragStarted(int edgeFlags, int pointerId) { |
| final View toCapture; |
| if ((edgeFlags & ViewDragHelper.EDGE_LEFT) == ViewDragHelper.EDGE_LEFT) { |
| toCapture = findDrawerWithGravity(Gravity.LEFT); |
| } else { |
| toCapture = findDrawerWithGravity(Gravity.RIGHT); |
| } |
| |
| if (toCapture != null && getDrawerLockMode(toCapture) == LOCK_MODE_UNLOCKED) { |
| mDragger.captureChildView(toCapture, pointerId); |
| } |
| } |
| |
| @Override |
| public int getViewHorizontalDragRange(View child) { |
| return child.getWidth(); |
| } |
| |
| @Override |
| public int clampViewPositionHorizontal(View child, int left, int dx) { |
| if (checkDrawerViewAbsoluteGravity(child, Gravity.LEFT)) { |
| return Math.max(-child.getWidth(), Math.min(left, 0)); |
| } else { |
| final int width = getWidth(); |
| return Math.max(width - child.getWidth(), Math.min(left, width)); |
| } |
| } |
| |
| @Override |
| public int clampViewPositionVertical(View child, int top, int dy) { |
| return child.getTop(); |
| } |
| } |
| |
| public static class LayoutParams extends ViewGroup.MarginLayoutParams { |
| |
| public int gravity = Gravity.NO_GRAVITY; |
| float onScreen; |
| boolean isPeeking; |
| boolean knownOpen; |
| |
| public LayoutParams(Context c, AttributeSet attrs) { |
| super(c, attrs); |
| |
| final TypedArray a = c.obtainStyledAttributes(attrs, LAYOUT_ATTRS); |
| this.gravity = a.getInt(0, Gravity.NO_GRAVITY); |
| a.recycle(); |
| } |
| |
| public LayoutParams(int width, int height) { |
| super(width, height); |
| } |
| |
| public LayoutParams(int width, int height, int gravity) { |
| this(width, height); |
| this.gravity = gravity; |
| } |
| |
| public LayoutParams(LayoutParams source) { |
| super(source); |
| this.gravity = source.gravity; |
| } |
| |
| public LayoutParams(ViewGroup.LayoutParams source) { |
| super(source); |
| } |
| |
| public LayoutParams(ViewGroup.MarginLayoutParams source) { |
| super(source); |
| } |
| } |
| |
| class AccessibilityDelegate extends AccessibilityDelegateCompat { |
| private final Rect mTmpRect = new Rect(); |
| |
| @Override |
| public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { |
| final AccessibilityNodeInfoCompat superNode = AccessibilityNodeInfoCompat.obtain(info); |
| super.onInitializeAccessibilityNodeInfo(host, superNode); |
| |
| info.setSource(host); |
| final ViewParent parent = ViewCompat.getParentForAccessibility(host); |
| if (parent instanceof View) { |
| info.setParent((View) parent); |
| } |
| copyNodeInfoNoChildren(info, superNode); |
| |
| superNode.recycle(); |
| |
| addChildrenForAccessibility(info, (ViewGroup) host); |
| } |
| |
| private void addChildrenForAccessibility(AccessibilityNodeInfoCompat info, ViewGroup v) { |
| final int childCount = v.getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = v.getChildAt(i); |
| if (filter(child)) { |
| continue; |
| } |
| |
| // Adding children that are marked as not important for |
| // accessibility will break the hierarchy, so we need to check |
| // that value and re-parent views if necessary. |
| final int importance = ViewCompat.getImportantForAccessibility(child); |
| switch (importance) { |
| case ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS: |
| // Always skip NO_HIDE views and their descendants. |
| break; |
| case ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO: |
| // Re-parent children of NO view groups, skip NO views. |
| if (child instanceof ViewGroup) { |
| addChildrenForAccessibility(info, (ViewGroup) child); |
| } |
| break; |
| case ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO: |
| // Force AUTO views to YES and add them. |
| ViewCompat.setImportantForAccessibility( |
| child, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES); |
| case ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES: |
| info.addChild(child); |
| break; |
| } |
| } |
| } |
| |
| @Override |
| public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, |
| AccessibilityEvent event) { |
| if (!filter(child)) { |
| return super.onRequestSendAccessibilityEvent(host, child, event); |
| } |
| return false; |
| } |
| |
| public boolean filter(View child) { |
| final View openDrawer = findOpenDrawer(); |
| return openDrawer != null && openDrawer != child; |
| } |
| |
| /** |
| * This should really be in AccessibilityNodeInfoCompat, but there unfortunately |
| * seem to be a few elements that are not easily cloneable using the underlying API. |
| * Leave it private here as it's not general-purpose useful. |
| */ |
| private void copyNodeInfoNoChildren(AccessibilityNodeInfoCompat dest, |
| AccessibilityNodeInfoCompat src) { |
| final Rect rect = mTmpRect; |
| |
| src.getBoundsInParent(rect); |
| dest.setBoundsInParent(rect); |
| |
| src.getBoundsInScreen(rect); |
| dest.setBoundsInScreen(rect); |
| |
| dest.setVisibleToUser(src.isVisibleToUser()); |
| dest.setPackageName(src.getPackageName()); |
| dest.setClassName(src.getClassName()); |
| dest.setContentDescription(src.getContentDescription()); |
| |
| dest.setEnabled(src.isEnabled()); |
| dest.setClickable(src.isClickable()); |
| dest.setFocusable(src.isFocusable()); |
| dest.setFocused(src.isFocused()); |
| dest.setAccessibilityFocused(src.isAccessibilityFocused()); |
| dest.setSelected(src.isSelected()); |
| dest.setLongClickable(src.isLongClickable()); |
| |
| dest.addAction(src.getActions()); |
| } |
| } |
| } |