| /* |
| * 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 com.android.internal.R; |
| |
| import java.util.ArrayDeque; |
| import java.util.ArrayList; |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.graphics.Rect; |
| import android.util.AttributeSet; |
| import android.util.Pool; |
| import android.util.Poolable; |
| import android.util.PoolableManager; |
| import android.util.Pools; |
| import android.util.SparseArray; |
| import android.view.Gravity; |
| import android.view.View; |
| import android.view.ViewDebug; |
| import android.view.ViewGroup; |
| import android.view.accessibility.AccessibilityEvent; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| import android.widget.RemoteViews.RemoteView; |
| |
| import static android.util.Log.d; |
| |
| /** |
| * A Layout where the positions of the children can be described in relation to each other or to the |
| * parent. |
| * |
| * <p> |
| * Note that you cannot have a circular dependency between the size of the RelativeLayout and the |
| * position of its children. For example, you cannot have a RelativeLayout whose height is set to |
| * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT WRAP_CONTENT} and a child set to |
| * {@link #ALIGN_PARENT_BOTTOM}. |
| * </p> |
| * |
| * <p>See the <a href="{@docRoot}guide/topics/ui/layout/relative.html">Relative |
| * Layout</a> guide.</p> |
| * |
| * <p> |
| * Also see {@link android.widget.RelativeLayout.LayoutParams RelativeLayout.LayoutParams} for |
| * layout attributes |
| * </p> |
| * |
| * @attr ref android.R.styleable#RelativeLayout_gravity |
| * @attr ref android.R.styleable#RelativeLayout_ignoreGravity |
| */ |
| @RemoteView |
| public class RelativeLayout extends ViewGroup { |
| private static final String LOG_TAG = "RelativeLayout"; |
| |
| private static final boolean DEBUG_GRAPH = false; |
| |
| public static final int TRUE = -1; |
| |
| /** |
| * Rule that aligns a child's right edge with another child's left edge. |
| */ |
| public static final int LEFT_OF = 0; |
| /** |
| * Rule that aligns a child's left edge with another child's right edge. |
| */ |
| public static final int RIGHT_OF = 1; |
| /** |
| * Rule that aligns a child's bottom edge with another child's top edge. |
| */ |
| public static final int ABOVE = 2; |
| /** |
| * Rule that aligns a child's top edge with another child's bottom edge. |
| */ |
| public static final int BELOW = 3; |
| |
| /** |
| * Rule that aligns a child's baseline with another child's baseline. |
| */ |
| public static final int ALIGN_BASELINE = 4; |
| /** |
| * Rule that aligns a child's left edge with another child's left edge. |
| */ |
| public static final int ALIGN_LEFT = 5; |
| /** |
| * Rule that aligns a child's top edge with another child's top edge. |
| */ |
| public static final int ALIGN_TOP = 6; |
| /** |
| * Rule that aligns a child's right edge with another child's right edge. |
| */ |
| public static final int ALIGN_RIGHT = 7; |
| /** |
| * Rule that aligns a child's bottom edge with another child's bottom edge. |
| */ |
| public static final int ALIGN_BOTTOM = 8; |
| |
| /** |
| * Rule that aligns the child's left edge with its RelativeLayout |
| * parent's left edge. |
| */ |
| public static final int ALIGN_PARENT_LEFT = 9; |
| /** |
| * Rule that aligns the child's top edge with its RelativeLayout |
| * parent's top edge. |
| */ |
| public static final int ALIGN_PARENT_TOP = 10; |
| /** |
| * Rule that aligns the child's right edge with its RelativeLayout |
| * parent's right edge. |
| */ |
| public static final int ALIGN_PARENT_RIGHT = 11; |
| /** |
| * Rule that aligns the child's bottom edge with its RelativeLayout |
| * parent's bottom edge. |
| */ |
| public static final int ALIGN_PARENT_BOTTOM = 12; |
| |
| /** |
| * Rule that centers the child with respect to the bounds of its |
| * RelativeLayout parent. |
| */ |
| public static final int CENTER_IN_PARENT = 13; |
| /** |
| * Rule that centers the child horizontally with respect to the |
| * bounds of its RelativeLayout parent. |
| */ |
| public static final int CENTER_HORIZONTAL = 14; |
| /** |
| * Rule that centers the child vertically with respect to the |
| * bounds of its RelativeLayout parent. |
| */ |
| public static final int CENTER_VERTICAL = 15; |
| |
| private static final int VERB_COUNT = 16; |
| |
| |
| private static final int[] RULES_VERTICAL = { |
| ABOVE, BELOW, ALIGN_BASELINE, ALIGN_TOP, ALIGN_BOTTOM |
| }; |
| |
| private static final int[] RULES_HORIZONTAL = { |
| LEFT_OF, RIGHT_OF, ALIGN_LEFT, ALIGN_RIGHT |
| }; |
| |
| private View mBaselineView = null; |
| private boolean mHasBaselineAlignedChild; |
| |
| private int mGravity = Gravity.LEFT | Gravity.TOP; |
| private final Rect mContentBounds = new Rect(); |
| private final Rect mSelfBounds = new Rect(); |
| private int mIgnoreGravity; |
| |
| private SortedSet<View> mTopToBottomLeftToRightSet = null; |
| |
| private boolean mDirtyHierarchy; |
| private View[] mSortedHorizontalChildren = new View[0]; |
| private View[] mSortedVerticalChildren = new View[0]; |
| private final DependencyGraph mGraph = new DependencyGraph(); |
| |
| public RelativeLayout(Context context) { |
| super(context); |
| } |
| |
| public RelativeLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| initFromAttributes(context, attrs); |
| } |
| |
| public RelativeLayout(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| initFromAttributes(context, attrs); |
| } |
| |
| private void initFromAttributes(Context context, AttributeSet attrs) { |
| TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RelativeLayout); |
| mIgnoreGravity = a.getResourceId(R.styleable.RelativeLayout_ignoreGravity, View.NO_ID); |
| mGravity = a.getInt(R.styleable.RelativeLayout_gravity, mGravity); |
| a.recycle(); |
| } |
| |
| @Override |
| public boolean shouldDelayChildPressedState() { |
| return false; |
| } |
| |
| /** |
| * Defines which View is ignored when the gravity is applied. This setting has no |
| * effect if the gravity is <code>Gravity.LEFT | Gravity.TOP</code>. |
| * |
| * @param viewId The id of the View to be ignored by gravity, or 0 if no View |
| * should be ignored. |
| * |
| * @see #setGravity(int) |
| * |
| * @attr ref android.R.styleable#RelativeLayout_ignoreGravity |
| */ |
| @android.view.RemotableViewMethod |
| public void setIgnoreGravity(int viewId) { |
| mIgnoreGravity = viewId; |
| } |
| |
| /** |
| * Describes how the child views are positioned. |
| * |
| * @return the gravity. |
| * |
| * @see #setGravity(int) |
| * @see android.view.Gravity |
| * |
| * @attr ref android.R.styleable#RelativeLayout_gravity |
| */ |
| public int getGravity() { |
| return mGravity; |
| } |
| |
| /** |
| * Describes how the child views are positioned. Defaults to |
| * <code>Gravity.LEFT | Gravity.TOP</code>. |
| * |
| * <p>Note that since RelativeLayout considers the positioning of each child |
| * relative to one another to be significant, setting gravity will affect |
| * the positioning of all children as a single unit within the parent. |
| * This happens after children have been relatively positioned.</p> |
| * |
| * @param gravity See {@link android.view.Gravity} |
| * |
| * @see #setHorizontalGravity(int) |
| * @see #setVerticalGravity(int) |
| * |
| * @attr ref android.R.styleable#RelativeLayout_gravity |
| */ |
| @android.view.RemotableViewMethod |
| public void setGravity(int gravity) { |
| if (mGravity != gravity) { |
| if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) { |
| gravity |= Gravity.START; |
| } |
| |
| if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) { |
| gravity |= Gravity.TOP; |
| } |
| |
| mGravity = gravity; |
| requestLayout(); |
| } |
| } |
| |
| @android.view.RemotableViewMethod |
| public void setHorizontalGravity(int horizontalGravity) { |
| final int gravity = horizontalGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK; |
| if ((mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) != gravity) { |
| mGravity = (mGravity & ~Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) | gravity; |
| requestLayout(); |
| } |
| } |
| |
| @android.view.RemotableViewMethod |
| public void setVerticalGravity(int verticalGravity) { |
| final int gravity = verticalGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != gravity) { |
| mGravity = (mGravity & ~Gravity.VERTICAL_GRAVITY_MASK) | gravity; |
| requestLayout(); |
| } |
| } |
| |
| @Override |
| public int getBaseline() { |
| return mBaselineView != null ? mBaselineView.getBaseline() : super.getBaseline(); |
| } |
| |
| @Override |
| public void requestLayout() { |
| super.requestLayout(); |
| mDirtyHierarchy = true; |
| } |
| |
| private void sortChildren() { |
| int count = getChildCount(); |
| if (mSortedVerticalChildren.length != count) mSortedVerticalChildren = new View[count]; |
| if (mSortedHorizontalChildren.length != count) mSortedHorizontalChildren = new View[count]; |
| |
| final DependencyGraph graph = mGraph; |
| graph.clear(); |
| |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| graph.add(child); |
| } |
| |
| if (DEBUG_GRAPH) { |
| d(LOG_TAG, "=== Sorted vertical children"); |
| graph.log(getResources(), RULES_VERTICAL); |
| d(LOG_TAG, "=== Sorted horizontal children"); |
| graph.log(getResources(), RULES_HORIZONTAL); |
| } |
| |
| graph.getSortedViews(mSortedVerticalChildren, RULES_VERTICAL); |
| graph.getSortedViews(mSortedHorizontalChildren, RULES_HORIZONTAL); |
| |
| if (DEBUG_GRAPH) { |
| d(LOG_TAG, "=== Ordered list of vertical children"); |
| for (View view : mSortedVerticalChildren) { |
| DependencyGraph.printViewId(getResources(), view); |
| } |
| d(LOG_TAG, "=== Ordered list of horizontal children"); |
| for (View view : mSortedHorizontalChildren) { |
| DependencyGraph.printViewId(getResources(), view); |
| } |
| } |
| } |
| |
| // TODO: we need to find another way to implement RelativeLayout |
| // This implementation cannot handle every case |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| if (mDirtyHierarchy) { |
| mDirtyHierarchy = false; |
| sortChildren(); |
| } |
| |
| int myWidth = -1; |
| int myHeight = -1; |
| |
| int width = 0; |
| int height = 0; |
| |
| int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| |
| // Record our dimensions if they are known; |
| if (widthMode != MeasureSpec.UNSPECIFIED) { |
| myWidth = widthSize; |
| } |
| |
| if (heightMode != MeasureSpec.UNSPECIFIED) { |
| myHeight = heightSize; |
| } |
| |
| if (widthMode == MeasureSpec.EXACTLY) { |
| width = myWidth; |
| } |
| |
| if (heightMode == MeasureSpec.EXACTLY) { |
| height = myHeight; |
| } |
| |
| mHasBaselineAlignedChild = false; |
| |
| View ignore = null; |
| int gravity = mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK; |
| final boolean horizontalGravity = gravity != Gravity.LEFT && gravity != 0; |
| gravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; |
| final boolean verticalGravity = gravity != Gravity.TOP && gravity != 0; |
| |
| int left = Integer.MAX_VALUE; |
| int top = Integer.MAX_VALUE; |
| int right = Integer.MIN_VALUE; |
| int bottom = Integer.MIN_VALUE; |
| |
| boolean offsetHorizontalAxis = false; |
| boolean offsetVerticalAxis = false; |
| |
| if ((horizontalGravity || verticalGravity) && mIgnoreGravity != View.NO_ID) { |
| ignore = findViewById(mIgnoreGravity); |
| } |
| |
| final boolean isWrapContentWidth = widthMode != MeasureSpec.EXACTLY; |
| final boolean isWrapContentHeight = heightMode != MeasureSpec.EXACTLY; |
| |
| View[] views = mSortedHorizontalChildren; |
| int count = views.length; |
| for (int i = 0; i < count; i++) { |
| View child = views[i]; |
| if (child.getVisibility() != GONE) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| |
| applyHorizontalSizeRules(params, myWidth); |
| measureChildHorizontal(child, params, myWidth, myHeight); |
| if (positionChildHorizontal(child, params, myWidth, isWrapContentWidth)) { |
| offsetHorizontalAxis = true; |
| } |
| } |
| } |
| |
| views = mSortedVerticalChildren; |
| count = views.length; |
| |
| for (int i = 0; i < count; i++) { |
| View child = views[i]; |
| if (child.getVisibility() != GONE) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| |
| applyVerticalSizeRules(params, myHeight); |
| measureChild(child, params, myWidth, myHeight); |
| if (positionChildVertical(child, params, myHeight, isWrapContentHeight)) { |
| offsetVerticalAxis = true; |
| } |
| |
| if (isWrapContentWidth) { |
| width = Math.max(width, params.mRight); |
| } |
| |
| if (isWrapContentHeight) { |
| height = Math.max(height, params.mBottom); |
| } |
| |
| if (child != ignore || verticalGravity) { |
| left = Math.min(left, params.mLeft - params.leftMargin); |
| top = Math.min(top, params.mTop - params.topMargin); |
| } |
| |
| if (child != ignore || horizontalGravity) { |
| right = Math.max(right, params.mRight + params.rightMargin); |
| bottom = Math.max(bottom, params.mBottom + params.bottomMargin); |
| } |
| } |
| } |
| |
| if (mHasBaselineAlignedChild) { |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| alignBaseline(child, params); |
| |
| if (child != ignore || verticalGravity) { |
| left = Math.min(left, params.mLeft - params.leftMargin); |
| top = Math.min(top, params.mTop - params.topMargin); |
| } |
| |
| if (child != ignore || horizontalGravity) { |
| right = Math.max(right, params.mRight + params.rightMargin); |
| bottom = Math.max(bottom, params.mBottom + params.bottomMargin); |
| } |
| } |
| } |
| } |
| |
| if (isWrapContentWidth) { |
| // Width already has left padding in it since it was calculated by looking at |
| // the right of each child view |
| width += mPaddingRight; |
| |
| if (mLayoutParams.width >= 0) { |
| width = Math.max(width, mLayoutParams.width); |
| } |
| |
| width = Math.max(width, getSuggestedMinimumWidth()); |
| width = resolveSize(width, widthMeasureSpec); |
| |
| if (offsetHorizontalAxis) { |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| final int[] rules = params.getRules(); |
| if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_HORIZONTAL] != 0) { |
| centerHorizontal(child, params, width); |
| } else if (rules[ALIGN_PARENT_RIGHT] != 0) { |
| final int childWidth = child.getMeasuredWidth(); |
| params.mLeft = width - mPaddingRight - childWidth; |
| params.mRight = params.mLeft + childWidth; |
| } |
| } |
| } |
| } |
| } |
| |
| if (isWrapContentHeight) { |
| // Height already has top padding in it since it was calculated by looking at |
| // the bottom of each child view |
| height += mPaddingBottom; |
| |
| if (mLayoutParams.height >= 0) { |
| height = Math.max(height, mLayoutParams.height); |
| } |
| |
| height = Math.max(height, getSuggestedMinimumHeight()); |
| height = resolveSize(height, heightMeasureSpec); |
| |
| if (offsetVerticalAxis) { |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| final int[] rules = params.getRules(); |
| if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_VERTICAL] != 0) { |
| centerVertical(child, params, height); |
| } else if (rules[ALIGN_PARENT_BOTTOM] != 0) { |
| final int childHeight = child.getMeasuredHeight(); |
| params.mTop = height - mPaddingBottom - childHeight; |
| params.mBottom = params.mTop + childHeight; |
| } |
| } |
| } |
| } |
| } |
| |
| if (horizontalGravity || verticalGravity) { |
| final Rect selfBounds = mSelfBounds; |
| selfBounds.set(mPaddingLeft, mPaddingTop, width - mPaddingRight, |
| height - mPaddingBottom); |
| |
| final Rect contentBounds = mContentBounds; |
| final int layoutDirection = getResolvedLayoutDirection(); |
| Gravity.apply(mGravity, right - left, bottom - top, selfBounds, contentBounds, |
| layoutDirection); |
| |
| final int horizontalOffset = contentBounds.left - left; |
| final int verticalOffset = contentBounds.top - top; |
| if (horizontalOffset != 0 || verticalOffset != 0) { |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != GONE && child != ignore) { |
| LayoutParams params = (LayoutParams) child.getLayoutParams(); |
| if (horizontalGravity) { |
| params.mLeft += horizontalOffset; |
| params.mRight += horizontalOffset; |
| } |
| if (verticalGravity) { |
| params.mTop += verticalOffset; |
| params.mBottom += verticalOffset; |
| } |
| } |
| } |
| } |
| } |
| |
| setMeasuredDimension(width, height); |
| } |
| |
| private void alignBaseline(View child, LayoutParams params) { |
| int[] rules = params.getRules(); |
| int anchorBaseline = getRelatedViewBaseline(rules, ALIGN_BASELINE); |
| |
| if (anchorBaseline != -1) { |
| LayoutParams anchorParams = getRelatedViewParams(rules, ALIGN_BASELINE); |
| if (anchorParams != null) { |
| int offset = anchorParams.mTop + anchorBaseline; |
| int baseline = child.getBaseline(); |
| if (baseline != -1) { |
| offset -= baseline; |
| } |
| int height = params.mBottom - params.mTop; |
| params.mTop = offset; |
| params.mBottom = params.mTop + height; |
| } |
| } |
| |
| if (mBaselineView == null) { |
| mBaselineView = child; |
| } else { |
| LayoutParams lp = (LayoutParams) mBaselineView.getLayoutParams(); |
| if (params.mTop < lp.mTop || (params.mTop == lp.mTop && params.mLeft < lp.mLeft)) { |
| mBaselineView = child; |
| } |
| } |
| } |
| |
| /** |
| * Measure a child. The child should have left, top, right and bottom information |
| * stored in its LayoutParams. If any of these values is -1 it means that the view |
| * can extend up to the corresponding edge. |
| * |
| * @param child Child to measure |
| * @param params LayoutParams associated with child |
| * @param myWidth Width of the the RelativeLayout |
| * @param myHeight Height of the RelativeLayout |
| */ |
| private void measureChild(View child, LayoutParams params, int myWidth, int myHeight) { |
| int childWidthMeasureSpec = getChildMeasureSpec(params.mLeft, |
| params.mRight, params.width, |
| params.leftMargin, params.rightMargin, |
| mPaddingLeft, mPaddingRight, |
| myWidth); |
| int childHeightMeasureSpec = getChildMeasureSpec(params.mTop, |
| params.mBottom, params.height, |
| params.topMargin, params.bottomMargin, |
| mPaddingTop, mPaddingBottom, |
| myHeight); |
| child.measure(childWidthMeasureSpec, childHeightMeasureSpec); |
| } |
| |
| private void measureChildHorizontal(View child, LayoutParams params, int myWidth, int myHeight) { |
| int childWidthMeasureSpec = getChildMeasureSpec(params.mLeft, |
| params.mRight, params.width, |
| params.leftMargin, params.rightMargin, |
| mPaddingLeft, mPaddingRight, |
| myWidth); |
| int childHeightMeasureSpec; |
| if (params.width == LayoutParams.MATCH_PARENT) { |
| childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(myHeight, MeasureSpec.EXACTLY); |
| } else { |
| childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(myHeight, MeasureSpec.AT_MOST); |
| } |
| child.measure(childWidthMeasureSpec, childHeightMeasureSpec); |
| } |
| |
| /** |
| * Get a measure spec that accounts for all of the constraints on this view. |
| * This includes size contstraints imposed by the RelativeLayout as well as |
| * the View's desired dimension. |
| * |
| * @param childStart The left or top field of the child's layout params |
| * @param childEnd The right or bottom field of the child's layout params |
| * @param childSize The child's desired size (the width or height field of |
| * the child's layout params) |
| * @param startMargin The left or top margin |
| * @param endMargin The right or bottom margin |
| * @param startPadding mPaddingLeft or mPaddingTop |
| * @param endPadding mPaddingRight or mPaddingBottom |
| * @param mySize The width or height of this view (the RelativeLayout) |
| * @return MeasureSpec for the child |
| */ |
| private int getChildMeasureSpec(int childStart, int childEnd, |
| int childSize, int startMargin, int endMargin, int startPadding, |
| int endPadding, int mySize) { |
| int childSpecMode = 0; |
| int childSpecSize = 0; |
| |
| // Figure out start and end bounds. |
| int tempStart = childStart; |
| int tempEnd = childEnd; |
| |
| // If the view did not express a layout constraint for an edge, use |
| // view's margins and our padding |
| if (tempStart < 0) { |
| tempStart = startPadding + startMargin; |
| } |
| if (tempEnd < 0) { |
| tempEnd = mySize - endPadding - endMargin; |
| } |
| |
| // Figure out maximum size available to this view |
| int maxAvailable = tempEnd - tempStart; |
| |
| if (childStart >= 0 && childEnd >= 0) { |
| // Constraints fixed both edges, so child must be an exact size |
| childSpecMode = MeasureSpec.EXACTLY; |
| childSpecSize = maxAvailable; |
| } else { |
| if (childSize >= 0) { |
| // Child wanted an exact size. Give as much as possible |
| childSpecMode = MeasureSpec.EXACTLY; |
| |
| if (maxAvailable >= 0) { |
| // We have a maxmum size in this dimension. |
| childSpecSize = Math.min(maxAvailable, childSize); |
| } else { |
| // We can grow in this dimension. |
| childSpecSize = childSize; |
| } |
| } else if (childSize == LayoutParams.MATCH_PARENT) { |
| // Child wanted to be as big as possible. Give all availble |
| // space |
| childSpecMode = MeasureSpec.EXACTLY; |
| childSpecSize = maxAvailable; |
| } else if (childSize == LayoutParams.WRAP_CONTENT) { |
| // Child wants to wrap content. Use AT_MOST |
| // to communicate available space if we know |
| // our max size |
| if (maxAvailable >= 0) { |
| // We have a maxmum size in this dimension. |
| childSpecMode = MeasureSpec.AT_MOST; |
| childSpecSize = maxAvailable; |
| } else { |
| // We can grow in this dimension. Child can be as big as it |
| // wants |
| childSpecMode = MeasureSpec.UNSPECIFIED; |
| childSpecSize = 0; |
| } |
| } |
| } |
| |
| return MeasureSpec.makeMeasureSpec(childSpecSize, childSpecMode); |
| } |
| |
| private boolean positionChildHorizontal(View child, LayoutParams params, int myWidth, |
| boolean wrapContent) { |
| |
| int[] rules = params.getRules(); |
| |
| if (params.mLeft < 0 && params.mRight >= 0) { |
| // Right is fixed, but left varies |
| params.mLeft = params.mRight - child.getMeasuredWidth(); |
| } else if (params.mLeft >= 0 && params.mRight < 0) { |
| // Left is fixed, but right varies |
| params.mRight = params.mLeft + child.getMeasuredWidth(); |
| } else if (params.mLeft < 0 && params.mRight < 0) { |
| // Both left and right vary |
| if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_HORIZONTAL] != 0) { |
| if (!wrapContent) { |
| centerHorizontal(child, params, myWidth); |
| } else { |
| params.mLeft = mPaddingLeft + params.leftMargin; |
| params.mRight = params.mLeft + child.getMeasuredWidth(); |
| } |
| return true; |
| } else { |
| params.mLeft = mPaddingLeft + params.leftMargin; |
| params.mRight = params.mLeft + child.getMeasuredWidth(); |
| } |
| } |
| return rules[ALIGN_PARENT_RIGHT] != 0; |
| } |
| |
| private boolean positionChildVertical(View child, LayoutParams params, int myHeight, |
| boolean wrapContent) { |
| |
| int[] rules = params.getRules(); |
| |
| if (params.mTop < 0 && params.mBottom >= 0) { |
| // Bottom is fixed, but top varies |
| params.mTop = params.mBottom - child.getMeasuredHeight(); |
| } else if (params.mTop >= 0 && params.mBottom < 0) { |
| // Top is fixed, but bottom varies |
| params.mBottom = params.mTop + child.getMeasuredHeight(); |
| } else if (params.mTop < 0 && params.mBottom < 0) { |
| // Both top and bottom vary |
| if (rules[CENTER_IN_PARENT] != 0 || rules[CENTER_VERTICAL] != 0) { |
| if (!wrapContent) { |
| centerVertical(child, params, myHeight); |
| } else { |
| params.mTop = mPaddingTop + params.topMargin; |
| params.mBottom = params.mTop + child.getMeasuredHeight(); |
| } |
| return true; |
| } else { |
| params.mTop = mPaddingTop + params.topMargin; |
| params.mBottom = params.mTop + child.getMeasuredHeight(); |
| } |
| } |
| return rules[ALIGN_PARENT_BOTTOM] != 0; |
| } |
| |
| private void applyHorizontalSizeRules(LayoutParams childParams, int myWidth) { |
| int[] rules = childParams.getRules(); |
| RelativeLayout.LayoutParams anchorParams; |
| |
| // -1 indicated a "soft requirement" in that direction. For example: |
| // left=10, right=-1 means the view must start at 10, but can go as far as it wants to the right |
| // left =-1, right=10 means the view must end at 10, but can go as far as it wants to the left |
| // left=10, right=20 means the left and right ends are both fixed |
| childParams.mLeft = -1; |
| childParams.mRight = -1; |
| |
| anchorParams = getRelatedViewParams(rules, LEFT_OF); |
| if (anchorParams != null) { |
| childParams.mRight = anchorParams.mLeft - (anchorParams.leftMargin + |
| childParams.rightMargin); |
| } else if (childParams.alignWithParent && rules[LEFT_OF] != 0) { |
| if (myWidth >= 0) { |
| childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| |
| anchorParams = getRelatedViewParams(rules, RIGHT_OF); |
| if (anchorParams != null) { |
| childParams.mLeft = anchorParams.mRight + (anchorParams.rightMargin + |
| childParams.leftMargin); |
| } else if (childParams.alignWithParent && rules[RIGHT_OF] != 0) { |
| childParams.mLeft = mPaddingLeft + childParams.leftMargin; |
| } |
| |
| anchorParams = getRelatedViewParams(rules, ALIGN_LEFT); |
| if (anchorParams != null) { |
| childParams.mLeft = anchorParams.mLeft + childParams.leftMargin; |
| } else if (childParams.alignWithParent && rules[ALIGN_LEFT] != 0) { |
| childParams.mLeft = mPaddingLeft + childParams.leftMargin; |
| } |
| |
| anchorParams = getRelatedViewParams(rules, ALIGN_RIGHT); |
| if (anchorParams != null) { |
| childParams.mRight = anchorParams.mRight - childParams.rightMargin; |
| } else if (childParams.alignWithParent && rules[ALIGN_RIGHT] != 0) { |
| if (myWidth >= 0) { |
| childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| |
| if (0 != rules[ALIGN_PARENT_LEFT]) { |
| childParams.mLeft = mPaddingLeft + childParams.leftMargin; |
| } |
| |
| if (0 != rules[ALIGN_PARENT_RIGHT]) { |
| if (myWidth >= 0) { |
| childParams.mRight = myWidth - mPaddingRight - childParams.rightMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| } |
| |
| private void applyVerticalSizeRules(LayoutParams childParams, int myHeight) { |
| int[] rules = childParams.getRules(); |
| RelativeLayout.LayoutParams anchorParams; |
| |
| childParams.mTop = -1; |
| childParams.mBottom = -1; |
| |
| anchorParams = getRelatedViewParams(rules, ABOVE); |
| if (anchorParams != null) { |
| childParams.mBottom = anchorParams.mTop - (anchorParams.topMargin + |
| childParams.bottomMargin); |
| } else if (childParams.alignWithParent && rules[ABOVE] != 0) { |
| if (myHeight >= 0) { |
| childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| |
| anchorParams = getRelatedViewParams(rules, BELOW); |
| if (anchorParams != null) { |
| childParams.mTop = anchorParams.mBottom + (anchorParams.bottomMargin + |
| childParams.topMargin); |
| } else if (childParams.alignWithParent && rules[BELOW] != 0) { |
| childParams.mTop = mPaddingTop + childParams.topMargin; |
| } |
| |
| anchorParams = getRelatedViewParams(rules, ALIGN_TOP); |
| if (anchorParams != null) { |
| childParams.mTop = anchorParams.mTop + childParams.topMargin; |
| } else if (childParams.alignWithParent && rules[ALIGN_TOP] != 0) { |
| childParams.mTop = mPaddingTop + childParams.topMargin; |
| } |
| |
| anchorParams = getRelatedViewParams(rules, ALIGN_BOTTOM); |
| if (anchorParams != null) { |
| childParams.mBottom = anchorParams.mBottom - childParams.bottomMargin; |
| } else if (childParams.alignWithParent && rules[ALIGN_BOTTOM] != 0) { |
| if (myHeight >= 0) { |
| childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| |
| if (0 != rules[ALIGN_PARENT_TOP]) { |
| childParams.mTop = mPaddingTop + childParams.topMargin; |
| } |
| |
| if (0 != rules[ALIGN_PARENT_BOTTOM]) { |
| if (myHeight >= 0) { |
| childParams.mBottom = myHeight - mPaddingBottom - childParams.bottomMargin; |
| } else { |
| // FIXME uh oh... |
| } |
| } |
| |
| if (rules[ALIGN_BASELINE] != 0) { |
| mHasBaselineAlignedChild = true; |
| } |
| } |
| |
| private View getRelatedView(int[] rules, int relation) { |
| int id = rules[relation]; |
| if (id != 0) { |
| DependencyGraph.Node node = mGraph.mKeyNodes.get(id); |
| if (node == null) return null; |
| View v = node.view; |
| |
| // Find the first non-GONE view up the chain |
| while (v.getVisibility() == View.GONE) { |
| rules = ((LayoutParams) v.getLayoutParams()).getRules(); |
| node = mGraph.mKeyNodes.get((rules[relation])); |
| if (node == null) return null; |
| v = node.view; |
| } |
| |
| return v; |
| } |
| |
| return null; |
| } |
| |
| private LayoutParams getRelatedViewParams(int[] rules, int relation) { |
| View v = getRelatedView(rules, relation); |
| if (v != null) { |
| ViewGroup.LayoutParams params = v.getLayoutParams(); |
| if (params instanceof LayoutParams) { |
| return (LayoutParams) v.getLayoutParams(); |
| } |
| } |
| return null; |
| } |
| |
| private int getRelatedViewBaseline(int[] rules, int relation) { |
| View v = getRelatedView(rules, relation); |
| if (v != null) { |
| return v.getBaseline(); |
| } |
| return -1; |
| } |
| |
| private void centerHorizontal(View child, LayoutParams params, int myWidth) { |
| int childWidth = child.getMeasuredWidth(); |
| int left = (myWidth - childWidth) / 2; |
| |
| params.mLeft = left; |
| params.mRight = left + childWidth; |
| } |
| |
| private void centerVertical(View child, LayoutParams params, int myHeight) { |
| int childHeight = child.getMeasuredHeight(); |
| int top = (myHeight - childHeight) / 2; |
| |
| params.mTop = top; |
| params.mBottom = top + childHeight; |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| // The layout has actually already been performed and the positions |
| // cached. Apply the cached values to the children. |
| int count = getChildCount(); |
| |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| RelativeLayout.LayoutParams st = |
| (RelativeLayout.LayoutParams) child.getLayoutParams(); |
| child.layout(st.mLeft, st.mTop, st.mRight, st.mBottom); |
| |
| } |
| } |
| } |
| |
| @Override |
| public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| return new RelativeLayout.LayoutParams(getContext(), attrs); |
| } |
| |
| /** |
| * Returns a set of layout parameters with a width of |
| * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}, |
| * a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and no spanning. |
| */ |
| @Override |
| protected ViewGroup.LayoutParams generateDefaultLayoutParams() { |
| return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); |
| } |
| |
| // Override to allow type-checking of LayoutParams. |
| @Override |
| protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| return p instanceof RelativeLayout.LayoutParams; |
| } |
| |
| @Override |
| protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| return new LayoutParams(p); |
| } |
| |
| @Override |
| public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { |
| if (mTopToBottomLeftToRightSet == null) { |
| mTopToBottomLeftToRightSet = new TreeSet<View>(new TopToBottomLeftToRightComparator()); |
| } |
| |
| // sort children top-to-bottom and left-to-right |
| for (int i = 0, count = getChildCount(); i < count; i++) { |
| mTopToBottomLeftToRightSet.add(getChildAt(i)); |
| } |
| |
| for (View view : mTopToBottomLeftToRightSet) { |
| if (view.getVisibility() == View.VISIBLE |
| && view.dispatchPopulateAccessibilityEvent(event)) { |
| mTopToBottomLeftToRightSet.clear(); |
| return true; |
| } |
| } |
| |
| mTopToBottomLeftToRightSet.clear(); |
| return false; |
| } |
| |
| @Override |
| public void onInitializeAccessibilityEvent(AccessibilityEvent event) { |
| super.onInitializeAccessibilityEvent(event); |
| event.setClassName(RelativeLayout.class.getName()); |
| } |
| |
| @Override |
| public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { |
| super.onInitializeAccessibilityNodeInfo(info); |
| info.setClassName(RelativeLayout.class.getName()); |
| } |
| |
| /** |
| * Compares two views in left-to-right and top-to-bottom fashion. |
| */ |
| private class TopToBottomLeftToRightComparator implements Comparator<View> { |
| public int compare(View first, View second) { |
| // top - bottom |
| int topDifference = first.getTop() - second.getTop(); |
| if (topDifference != 0) { |
| return topDifference; |
| } |
| // left - right |
| int leftDifference = first.getLeft() - second.getLeft(); |
| if (leftDifference != 0) { |
| return leftDifference; |
| } |
| // break tie by height |
| int heightDiference = first.getHeight() - second.getHeight(); |
| if (heightDiference != 0) { |
| return heightDiference; |
| } |
| // break tie by width |
| int widthDiference = first.getWidth() - second.getWidth(); |
| if (widthDiference != 0) { |
| return widthDiference; |
| } |
| return 0; |
| } |
| } |
| |
| /** |
| * Per-child layout information associated with RelativeLayout. |
| * |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignWithParentIfMissing |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_toLeftOf |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_toRightOf |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_above |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_below |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignBaseline |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignLeft |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignTop |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignRight |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignBottom |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentLeft |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentTop |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentRight |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_alignParentBottom |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerInParent |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerHorizontal |
| * @attr ref android.R.styleable#RelativeLayout_Layout_layout_centerVertical |
| */ |
| public static class LayoutParams extends ViewGroup.MarginLayoutParams { |
| @ViewDebug.ExportedProperty(category = "layout", resolveId = true, indexMapping = { |
| @ViewDebug.IntToString(from = ABOVE, to = "above"), |
| @ViewDebug.IntToString(from = ALIGN_BASELINE, to = "alignBaseline"), |
| @ViewDebug.IntToString(from = ALIGN_BOTTOM, to = "alignBottom"), |
| @ViewDebug.IntToString(from = ALIGN_LEFT, to = "alignLeft"), |
| @ViewDebug.IntToString(from = ALIGN_PARENT_BOTTOM, to = "alignParentBottom"), |
| @ViewDebug.IntToString(from = ALIGN_PARENT_LEFT, to = "alignParentLeft"), |
| @ViewDebug.IntToString(from = ALIGN_PARENT_RIGHT, to = "alignParentRight"), |
| @ViewDebug.IntToString(from = ALIGN_PARENT_TOP, to = "alignParentTop"), |
| @ViewDebug.IntToString(from = ALIGN_RIGHT, to = "alignRight"), |
| @ViewDebug.IntToString(from = ALIGN_TOP, to = "alignTop"), |
| @ViewDebug.IntToString(from = BELOW, to = "below"), |
| @ViewDebug.IntToString(from = CENTER_HORIZONTAL, to = "centerHorizontal"), |
| @ViewDebug.IntToString(from = CENTER_IN_PARENT, to = "center"), |
| @ViewDebug.IntToString(from = CENTER_VERTICAL, to = "centerVertical"), |
| @ViewDebug.IntToString(from = LEFT_OF, to = "leftOf"), |
| @ViewDebug.IntToString(from = RIGHT_OF, to = "rightOf") |
| }, mapping = { |
| @ViewDebug.IntToString(from = TRUE, to = "true"), |
| @ViewDebug.IntToString(from = 0, to = "false/NO_ID") |
| }) |
| private int[] mRules = new int[VERB_COUNT]; |
| |
| private int mLeft, mTop, mRight, mBottom; |
| |
| /** |
| * When true, uses the parent as the anchor if the anchor doesn't exist or if |
| * the anchor's visibility is GONE. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public boolean alignWithParent; |
| |
| public LayoutParams(Context c, AttributeSet attrs) { |
| super(c, attrs); |
| |
| TypedArray a = c.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.RelativeLayout_Layout); |
| |
| final int[] rules = mRules; |
| |
| final int N = a.getIndexCount(); |
| for (int i = 0; i < N; i++) { |
| int attr = a.getIndex(i); |
| switch (attr) { |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignWithParentIfMissing: |
| alignWithParent = a.getBoolean(attr, false); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_toLeftOf: |
| rules[LEFT_OF] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_toRightOf: |
| rules[RIGHT_OF] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_above: |
| rules[ABOVE] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_below: |
| rules[BELOW] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignBaseline: |
| rules[ALIGN_BASELINE] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignLeft: |
| rules[ALIGN_LEFT] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignTop: |
| rules[ALIGN_TOP] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignRight: |
| rules[ALIGN_RIGHT] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignBottom: |
| rules[ALIGN_BOTTOM] = a.getResourceId(attr, 0); |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentLeft: |
| rules[ALIGN_PARENT_LEFT] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentTop: |
| rules[ALIGN_PARENT_TOP] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentRight: |
| rules[ALIGN_PARENT_RIGHT] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_alignParentBottom: |
| rules[ALIGN_PARENT_BOTTOM] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerInParent: |
| rules[CENTER_IN_PARENT] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerHorizontal: |
| rules[CENTER_HORIZONTAL] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| case com.android.internal.R.styleable.RelativeLayout_Layout_layout_centerVertical: |
| rules[CENTER_VERTICAL] = a.getBoolean(attr, false) ? TRUE : 0; |
| break; |
| } |
| } |
| |
| a.recycle(); |
| } |
| |
| public LayoutParams(int w, int h) { |
| super(w, h); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public LayoutParams(ViewGroup.LayoutParams source) { |
| super(source); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public LayoutParams(ViewGroup.MarginLayoutParams source) { |
| super(source); |
| } |
| |
| @Override |
| public String debug(String output) { |
| return output + "ViewGroup.LayoutParams={ width=" + sizeToString(width) + |
| ", height=" + sizeToString(height) + " }"; |
| } |
| |
| /** |
| * Adds a layout rule to be interpreted by the RelativeLayout. This |
| * method should only be used for constraints that don't refer to another sibling |
| * (e.g., CENTER_IN_PARENT) or take a boolean value ({@link RelativeLayout#TRUE} |
| * for true or - for false). To specify a verb that takes a subject, use |
| * {@link #addRule(int, int)} instead. |
| * |
| * @param verb One of the verbs defined by |
| * {@link android.widget.RelativeLayout RelativeLayout}, such as |
| * ALIGN_WITH_PARENT_LEFT. |
| * @see #addRule(int, int) |
| */ |
| public void addRule(int verb) { |
| mRules[verb] = TRUE; |
| } |
| |
| /** |
| * Adds a layout rule to be interpreted by the RelativeLayout. Use this for |
| * verbs that take a target, such as a sibling (ALIGN_RIGHT) or a boolean |
| * value (VISIBLE). |
| * |
| * @param verb One of the verbs defined by |
| * {@link android.widget.RelativeLayout RelativeLayout}, such as |
| * ALIGN_WITH_PARENT_LEFT. |
| * @param anchor The id of another view to use as an anchor, |
| * or a boolean value(represented as {@link RelativeLayout#TRUE}) |
| * for true or 0 for false). For verbs that don't refer to another sibling |
| * (for example, ALIGN_WITH_PARENT_BOTTOM) just use -1. |
| * @see #addRule(int) |
| */ |
| public void addRule(int verb, int anchor) { |
| mRules[verb] = anchor; |
| } |
| |
| /** |
| * Retrieves a complete list of all supported rules, where the index is the rule |
| * verb, and the element value is the value specified, or "false" if it was never |
| * set. |
| * |
| * @return the supported rules |
| * @see #addRule(int, int) |
| */ |
| public int[] getRules() { |
| return mRules; |
| } |
| } |
| |
| private static class DependencyGraph { |
| /** |
| * List of all views in the graph. |
| */ |
| private ArrayList<Node> mNodes = new ArrayList<Node>(); |
| |
| /** |
| * List of nodes in the graph. Each node is identified by its |
| * view id (see View#getId()). |
| */ |
| private SparseArray<Node> mKeyNodes = new SparseArray<Node>(); |
| |
| /** |
| * Temporary data structure used to build the list of roots |
| * for this graph. |
| */ |
| private ArrayDeque<Node> mRoots = new ArrayDeque<Node>(); |
| |
| /** |
| * Clears the graph. |
| */ |
| void clear() { |
| final ArrayList<Node> nodes = mNodes; |
| final int count = nodes.size(); |
| |
| for (int i = 0; i < count; i++) { |
| nodes.get(i).release(); |
| } |
| nodes.clear(); |
| |
| mKeyNodes.clear(); |
| mRoots.clear(); |
| } |
| |
| /** |
| * Adds a view to the graph. |
| * |
| * @param view The view to be added as a node to the graph. |
| */ |
| void add(View view) { |
| final int id = view.getId(); |
| final Node node = Node.acquire(view); |
| |
| if (id != View.NO_ID) { |
| mKeyNodes.put(id, node); |
| } |
| |
| mNodes.add(node); |
| } |
| |
| /** |
| * Builds a sorted list of views. The sorting order depends on the dependencies |
| * between the view. For instance, if view C needs view A to be processed first |
| * and view A needs view B to be processed first, the dependency graph |
| * is: B -> A -> C. The sorted array will contain views B, A and C in this order. |
| * |
| * @param sorted The sorted list of views. The length of this array must |
| * be equal to getChildCount(). |
| * @param rules The list of rules to take into account. |
| */ |
| void getSortedViews(View[] sorted, int... rules) { |
| final ArrayDeque<Node> roots = findRoots(rules); |
| int index = 0; |
| |
| Node node; |
| while ((node = roots.pollLast()) != null) { |
| final View view = node.view; |
| final int key = view.getId(); |
| |
| sorted[index++] = view; |
| |
| final HashMap<Node, DependencyGraph> dependents = node.dependents; |
| for (Node dependent : dependents.keySet()) { |
| final SparseArray<Node> dependencies = dependent.dependencies; |
| |
| dependencies.remove(key); |
| if (dependencies.size() == 0) { |
| roots.add(dependent); |
| } |
| } |
| } |
| |
| if (index < sorted.length) { |
| throw new IllegalStateException("Circular dependencies cannot exist" |
| + " in RelativeLayout"); |
| } |
| } |
| |
| /** |
| * Finds the roots of the graph. A root is a node with no dependency and |
| * with [0..n] dependents. |
| * |
| * @param rulesFilter The list of rules to consider when building the |
| * dependencies |
| * |
| * @return A list of node, each being a root of the graph |
| */ |
| private ArrayDeque<Node> findRoots(int[] rulesFilter) { |
| final SparseArray<Node> keyNodes = mKeyNodes; |
| final ArrayList<Node> nodes = mNodes; |
| final int count = nodes.size(); |
| |
| // Find roots can be invoked several times, so make sure to clear |
| // all dependents and dependencies before running the algorithm |
| for (int i = 0; i < count; i++) { |
| final Node node = nodes.get(i); |
| node.dependents.clear(); |
| node.dependencies.clear(); |
| } |
| |
| // Builds up the dependents and dependencies for each node of the graph |
| for (int i = 0; i < count; i++) { |
| final Node node = nodes.get(i); |
| |
| final LayoutParams layoutParams = (LayoutParams) node.view.getLayoutParams(); |
| final int[] rules = layoutParams.mRules; |
| final int rulesCount = rulesFilter.length; |
| |
| // Look only the the rules passed in parameter, this way we build only the |
| // dependencies for a specific set of rules |
| for (int j = 0; j < rulesCount; j++) { |
| final int rule = rules[rulesFilter[j]]; |
| if (rule > 0) { |
| // The node this node depends on |
| final Node dependency = keyNodes.get(rule); |
| // Skip unknowns and self dependencies |
| if (dependency == null || dependency == node) { |
| continue; |
| } |
| // Add the current node as a dependent |
| dependency.dependents.put(node, this); |
| // Add a dependency to the current node |
| node.dependencies.put(rule, dependency); |
| } |
| } |
| } |
| |
| final ArrayDeque<Node> roots = mRoots; |
| roots.clear(); |
| |
| // Finds all the roots in the graph: all nodes with no dependencies |
| for (int i = 0; i < count; i++) { |
| final Node node = nodes.get(i); |
| if (node.dependencies.size() == 0) roots.addLast(node); |
| } |
| |
| return roots; |
| } |
| |
| /** |
| * Prints the dependency graph for the specified rules. |
| * |
| * @param resources The context's resources to print the ids. |
| * @param rules The list of rules to take into account. |
| */ |
| void log(Resources resources, int... rules) { |
| final ArrayDeque<Node> roots = findRoots(rules); |
| for (Node node : roots) { |
| printNode(resources, node); |
| } |
| } |
| |
| static void printViewId(Resources resources, View view) { |
| if (view.getId() != View.NO_ID) { |
| d(LOG_TAG, resources.getResourceEntryName(view.getId())); |
| } else { |
| d(LOG_TAG, "NO_ID"); |
| } |
| } |
| |
| private static void appendViewId(Resources resources, Node node, StringBuilder buffer) { |
| if (node.view.getId() != View.NO_ID) { |
| buffer.append(resources.getResourceEntryName(node.view.getId())); |
| } else { |
| buffer.append("NO_ID"); |
| } |
| } |
| |
| private static void printNode(Resources resources, Node node) { |
| if (node.dependents.size() == 0) { |
| printViewId(resources, node.view); |
| } else { |
| for (Node dependent : node.dependents.keySet()) { |
| StringBuilder buffer = new StringBuilder(); |
| appendViewId(resources, node, buffer); |
| printdependents(resources, dependent, buffer); |
| } |
| } |
| } |
| |
| private static void printdependents(Resources resources, Node node, StringBuilder buffer) { |
| buffer.append(" -> "); |
| appendViewId(resources, node, buffer); |
| |
| if (node.dependents.size() == 0) { |
| d(LOG_TAG, buffer.toString()); |
| } else { |
| for (Node dependent : node.dependents.keySet()) { |
| StringBuilder subBuffer = new StringBuilder(buffer); |
| printdependents(resources, dependent, subBuffer); |
| } |
| } |
| } |
| |
| /** |
| * A node in the dependency graph. A node is a view, its list of dependencies |
| * and its list of dependents. |
| * |
| * A node with no dependent is considered a root of the graph. |
| */ |
| static class Node implements Poolable<Node> { |
| /** |
| * The view representing this node in the layout. |
| */ |
| View view; |
| |
| /** |
| * The list of dependents for this node; a dependent is a node |
| * that needs this node to be processed first. |
| */ |
| final HashMap<Node, DependencyGraph> dependents = new HashMap<Node, DependencyGraph>(); |
| |
| /** |
| * The list of dependencies for this node. |
| */ |
| final SparseArray<Node> dependencies = new SparseArray<Node>(); |
| |
| /* |
| * START POOL IMPLEMENTATION |
| */ |
| // The pool is static, so all nodes instances are shared across |
| // activities, that's why we give it a rather high limit |
| private static final int POOL_LIMIT = 100; |
| private static final Pool<Node> sPool = Pools.synchronizedPool( |
| Pools.finitePool(new PoolableManager<Node>() { |
| public Node newInstance() { |
| return new Node(); |
| } |
| |
| public void onAcquired(Node element) { |
| } |
| |
| public void onReleased(Node element) { |
| } |
| }, POOL_LIMIT) |
| ); |
| |
| private Node mNext; |
| private boolean mIsPooled; |
| |
| public void setNextPoolable(Node element) { |
| mNext = element; |
| } |
| |
| public Node getNextPoolable() { |
| return mNext; |
| } |
| |
| public boolean isPooled() { |
| return mIsPooled; |
| } |
| |
| public void setPooled(boolean isPooled) { |
| mIsPooled = isPooled; |
| } |
| |
| static Node acquire(View view) { |
| final Node node = sPool.acquire(); |
| node.view = view; |
| |
| return node; |
| } |
| |
| void release() { |
| view = null; |
| dependents.clear(); |
| dependencies.clear(); |
| |
| sPool.release(this); |
| } |
| /* |
| * END POOL IMPLEMENTATION |
| */ |
| } |
| } |
| } |
