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|
/*
* Copyright (C) 2012 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 com.android.dialer.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.AccessibilityDelegateCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.accessibility.AccessibilityEvent;
/**
* A custom layout that aligns its child views vertically as two panes, and allows for the bottom
* pane to be dragged upwards to overlap and hide the top pane. This layout is adapted from
* {@link android.support.v4.widget.SlidingPaneLayout}.
*/
public class OverlappingPaneLayout extends ViewGroup {
private static final String TAG = "SlidingPaneLayout";
private static final boolean DEBUG = false;
/**
* Default size of the overhang for a pane in the open state.
* At least this much of a sliding pane will remain visible.
* This indicates that there is more content available and provides
* a "physical" edge to grab to pull it closed.
*/
private static final int DEFAULT_OVERHANG_SIZE = 32; // dp;
/**
* If no fade color is given by default it will fade to 80% gray.
*/
private static final int DEFAULT_FADE_COLOR = 0xcccccccc;
/**
* Minimum velocity that will be detected as a fling
*/
private static final int MIN_FLING_VELOCITY = 400; // dips per second
/**
* The size of the overhang in pixels.
* This is the minimum section of the sliding panel that will
* be visible in the open state to allow for a closing drag.
*/
private final int mOverhangSize;
/**
* True if a panel can slide with the current measurements
*/
private boolean mCanSlide;
/**
* The child view that can slide, if any.
*/
private View mSlideableView;
/**
* The view that can be used to start the drag with.
*/
private View mCapturableView;
/**
* How far the panel is offset from its closed position.
* range [0, 1] where 0 = closed, 1 = open.
*/
private float mSlideOffset;
/**
* How far the panel is offset from its closed position, in pixels.
* range [0, {@link #mSlideRange}] where 0 is completely closed.
*/
private int mSlideOffsetPx;
/**
* How far in pixels the slideable panel may move.
*/
private int mSlideRange;
/**
* A panel view is locked into internal scrolling or another condition that
* is preventing a drag.
*/
private boolean mIsUnableToDrag;
/**
* Tracks whether or not a child view is in the process of a nested scroll.
*/
private boolean mIsInNestedScroll;
/**
* Indicates that the layout is currently in the process of a nested pre-scroll operation where
* the child scrolling view is being dragged downwards, and still has the ability to consume
* scroll events itself. If so, we should open the pane up to the maximum offset defined in
* {@link #mIntermediateOffset}, and no further, so that the child view can continue performing
* its own scroll.
*/
private boolean mInNestedPreScrollDownwards = false;
/**
* Indicates whether or not a nested scrolling child is able to scroll internally at this point
* in time.
*/
private boolean mChildCannotConsumeScroll;
/**
* Stores an offset used to represent a point somewhere in between the panel's fully closed
* state and fully opened state where the panel can be temporarily pinned or opened up to
* during scrolling.
*/
private int mIntermediateOffset = 0;
private float mInitialMotionX;
private float mInitialMotionY;
private PanelSlideListener mPanelSlideListener;
private final ViewDragHelper mDragHelper;
/**
* Stores whether or not the pane was open the last time it was slideable.
* If open/close operations are invoked this state is modified. Used by
* instance state save/restore.
*/
private boolean mPreservedOpenState;
private boolean mFirstLayout = true;
private final Rect mTmpRect = new Rect();
/**
* Listener for monitoring events about sliding panes.
*/
public interface PanelSlideListener {
/**
* Called when a sliding pane's position changes.
* @param panel The child view that was moved
* @param slideOffset The new offset of this sliding pane within its range, from 0-1
*/
public void onPanelSlide(View panel, float slideOffset);
/**
* Called when a sliding pane becomes slid completely open. The pane may or may not
* be interactive at this point depending on how much of the pane is visible.
* @param panel The child view that was slid to an open position, revealing other panes
*/
public void onPanelOpened(View panel);
/**
* Called when a sliding pane becomes slid completely closed. The pane is now guaranteed
* to be interactive. It may now obscure other views in the layout.
* @param panel The child view that was slid to a closed position
*/
public void onPanelClosed(View panel);
}
public OverlappingPaneLayout(Context context) {
this(context, null);
}
public OverlappingPaneLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public OverlappingPaneLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final float density = context.getResources().getDisplayMetrics().density;
mOverhangSize = (int) (DEFAULT_OVERHANG_SIZE * density + 0.5f);
setWillNotDraw(false);
ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate());
ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback());
mDragHelper.setMinVelocity(MIN_FLING_VELOCITY * density);
}
/**
* Set an offset, somewhere in between the panel's fully closed state and fully opened state,
* where the panel can be temporarily pinned or opened up to.
*
* @param offset Offset in pixels
*/
public void setIntermediatePinnedOffset(int offset) {
mIntermediateOffset = offset;
}
/**
* Set the view that can be used to start dragging the sliding pane.
*/
public void setCapturableView(View capturableView) {
mCapturableView = capturableView;
}
public void setPanelSlideListener(PanelSlideListener listener) {
mPanelSlideListener = listener;
}
void dispatchOnPanelSlide(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelSlide(panel, mSlideOffset);
}
}
void dispatchOnPanelOpened(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelOpened(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void dispatchOnPanelClosed(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelClosed(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void updateObscuredViewsVisibility(View panel) {
final int startBound = getPaddingTop();
final int endBound = getHeight() - getPaddingBottom();
final int leftBound = getPaddingLeft();
final int rightBound = getWidth() - getPaddingRight();
final int left;
final int right;
final int top;
final int bottom;
if (panel != null && viewIsOpaque(panel)) {
left = panel.getLeft();
right = panel.getRight();
top = panel.getTop();
bottom = panel.getBottom();
} else {
left = right = top = bottom = 0;
}
for (int i = 0, childCount = getChildCount(); i < childCount; i++) {
final View child = getChildAt(i);
if (child == panel) {
// There are still more children above the panel but they won't be affected.
break;
}
final int clampedChildLeft = Math.max(leftBound, child.getLeft());
final int clampedChildRight = Math.min(rightBound, child.getRight());
final int clampedChildTop = Math.max(startBound, child.getTop());
final int clampedChildBottom = Math.min(endBound, child.getBottom());
final int vis;
if (clampedChildLeft >= left && clampedChildTop >= top &&
clampedChildRight <= right && clampedChildBottom <= bottom) {
vis = INVISIBLE;
} else {
vis = VISIBLE;
}
child.setVisibility(vis);
}
}
void setAllChildrenVisible() {
for (int i = 0, childCount = getChildCount(); i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == INVISIBLE) {
child.setVisibility(VISIBLE);
}
}
}
private static boolean viewIsOpaque(View v) {
if (ViewCompat.isOpaque(v)) return true;
final Drawable bg = v.getBackground();
if (bg != null) {
return bg.getOpacity() == PixelFormat.OPAQUE;
}
return false;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mFirstLayout = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mFirstLayout = true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
if (widthMode != 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;
}
} else {
throw new IllegalStateException("Width must have an exact value or MATCH_PARENT");
}
} else if (heightMode == MeasureSpec.UNSPECIFIED) {
if (isInEditMode()) {
// Don't crash the layout editor. Pick a magic number from thin air instead.
// TODO Better communication with tools of this bogus state.
// It will crash on a real device.
if (heightMode == MeasureSpec.UNSPECIFIED) {
heightMode = MeasureSpec.AT_MOST;
heightSize = 300;
}
} else {
throw new IllegalStateException("Height must not be UNSPECIFIED");
}
}
int layoutWidth = 0;
int maxLayoutWidth = -1;
switch (widthMode) {
case MeasureSpec.EXACTLY:
layoutWidth = maxLayoutWidth = widthSize - getPaddingLeft() - getPaddingRight();
break;
case MeasureSpec.AT_MOST:
maxLayoutWidth = widthSize - getPaddingLeft() - getPaddingRight();
break;
}
float weightSum = 0;
boolean canSlide = false;
final int heightAvailable = heightSize - getPaddingTop() - getPaddingBottom();
int heightRemaining = heightAvailable;
final int childCount = getChildCount();
if (childCount > 2) {
Log.e(TAG, "onMeasure: More than two child views are not supported.");
}
// We'll find the current one below.
mSlideableView = null;
// First pass. Measure based on child LayoutParams width/height.
// Weight will incur a second pass.
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child.getVisibility() == GONE) {
continue;
}
if (lp.weight > 0) {
weightSum += lp.weight;
// If we have no height, weight is the only contributor to the final size.
// Measure this view on the weight pass only.
if (lp.height == 0) continue;
}
int childHeightSpec;
final int verticalMargin = lp.topMargin + lp.bottomMargin;
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(heightAvailable - verticalMargin,
MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.MATCH_PARENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(heightAvailable - verticalMargin,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
}
int childWidthSpec;
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth, MeasureSpec.AT_MOST);
} else if (lp.width == LayoutParams.MATCH_PARENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth, MeasureSpec.EXACTLY);
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY);
}
child.measure(childWidthSpec, childHeightSpec);
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
if (widthMode == MeasureSpec.AT_MOST && childWidth > layoutWidth) {
layoutWidth = Math.min(childWidth, maxLayoutWidth);
}
heightRemaining -= childHeight;
canSlide |= lp.slideable = heightRemaining < 0;
if (lp.slideable) {
mSlideableView = child;
}
}
// Resolve weight and make sure non-sliding panels are smaller than the full screen.
if (canSlide || weightSum > 0) {
final int fixedPanelHeightLimit = heightAvailable - mOverhangSize;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child.getVisibility() == GONE) {
continue;
}
final boolean skippedFirstPass = lp.height == 0 && lp.weight > 0;
final int measuredHeight = skippedFirstPass ? 0 : child.getMeasuredHeight();
if (canSlide && child != mSlideableView) {
if (lp.height < 0 && (measuredHeight > fixedPanelHeightLimit || lp.weight > 0)) {
// Fixed panels in a sliding configuration should
// be clamped to the fixed panel limit.
final int childWidthSpec;
if (skippedFirstPass) {
// Do initial width measurement if we skipped measuring this view
// the first time around.
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth,
MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.MATCH_PARENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth,
MeasureSpec.EXACTLY);
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width,
MeasureSpec.EXACTLY);
}
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(
child.getMeasuredWidth(), MeasureSpec.EXACTLY);
}
final int childHeightSpec = MeasureSpec.makeMeasureSpec(
fixedPanelHeightLimit, MeasureSpec.EXACTLY);
child.measure(childWidthSpec, childHeightSpec);
}
} else if (lp.weight > 0) {
int childWidthSpec;
if (lp.height == 0) {
// This was skipped the first time; figure out a real width spec.
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth,
MeasureSpec.AT_MOST);
} else if (lp.width == LayoutParams.MATCH_PARENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(maxLayoutWidth,
MeasureSpec.EXACTLY);
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width,
MeasureSpec.EXACTLY);
}
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(
child.getMeasuredWidth(), MeasureSpec.EXACTLY);
}
if (canSlide) {
// Consume available space
final int verticalMargin = lp.topMargin + lp.bottomMargin;
final int newHeight = heightAvailable - verticalMargin;
final int childHeightSpec = MeasureSpec.makeMeasureSpec(
newHeight, MeasureSpec.EXACTLY);
if (measuredHeight != newHeight) {
child.measure(childWidthSpec, childHeightSpec);
}
} else {
// Distribute the extra width proportionally similar to LinearLayout
final int heightToDistribute = Math.max(0, heightRemaining);
final int addedHeight = (int) (lp.weight * heightToDistribute / weightSum);
final int childHeightSpec = MeasureSpec.makeMeasureSpec(
measuredHeight + addedHeight, MeasureSpec.EXACTLY);
child.measure(childWidthSpec, childHeightSpec);
}
}
}
}
final int measuredHeight = heightSize;
final int measuredWidth = layoutWidth + getPaddingLeft() + getPaddingRight();
setMeasuredDimension(measuredWidth, measuredHeight);
mCanSlide = canSlide;
if (mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE && !canSlide) {
// Cancel scrolling in progress, it's no longer relevant.
mDragHelper.abort();
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_TOP);
final int height = b - t;
final int paddingTop = getPaddingTop();
final int paddingBottom = getPaddingBottom();
final int paddingLeft = getPaddingLeft();
final int childCount = getChildCount();
int yStart = paddingTop;
int nextYStart = yStart;
if (mFirstLayout) {
mSlideOffset = mCanSlide && mPreservedOpenState ? 1.f : 0.f;
}
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
final int childHeight = child.getMeasuredHeight();
if (lp.slideable) {
final int margin = lp.topMargin + lp.bottomMargin;
final int range = Math.min(nextYStart,
height - paddingBottom - mOverhangSize) - yStart - margin;
mSlideRange = range;
final int lpMargin = lp.topMargin;
final int pos = (int) (range * mSlideOffset);
yStart += pos + lpMargin;
updateSlideOffset(pos);
} else {
yStart = nextYStart;
}
final int childTop = yStart;
final int childBottom = childTop + childHeight;
final int childLeft = paddingLeft;
final int childRight = childLeft + child.getMeasuredWidth();
child.layout(childLeft, childTop, childRight, childBottom);
nextYStart += child.getHeight();
}
if (mFirstLayout) {
updateObscuredViewsVisibility(mSlideableView);
}
mFirstLayout = false;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Recalculate sliding panes and their details
if (h != oldh) {
mFirstLayout = true;
}
}
@Override
public void requestChildFocus(View child, View focused) {
super.requestChildFocus(child, focused);
if (!isInTouchMode() && !mCanSlide) {
mPreservedOpenState = child == mSlideableView;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = MotionEventCompat.getActionMasked(ev);
// Preserve the open state based on the last view that was touched.
if (!mCanSlide && action == MotionEvent.ACTION_DOWN && getChildCount() > 1) {
// After the first things will be slideable.
final View secondChild = getChildAt(1);
if (secondChild != null) {
mPreservedOpenState = !mDragHelper.isViewUnder(secondChild,
(int) ev.getX(), (int) ev.getY());
}
}
if (!mCanSlide || (mIsUnableToDrag && action != MotionEvent.ACTION_DOWN)) {
if (!mIsInNestedScroll) {
mDragHelper.cancel();
}
return super.onInterceptTouchEvent(ev);
}
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
if (!mIsInNestedScroll) {
mDragHelper.cancel();
}
return false;
}
switch (action) {
case MotionEvent.ACTION_DOWN: {
mIsUnableToDrag = false;
final float x = ev.getX();
final float y = ev.getY();
mInitialMotionX = x;
mInitialMotionY = y;
break;
}
case MotionEvent.ACTION_MOVE: {
final float x = ev.getX();
final float y = ev.getY();
final float adx = Math.abs(x - mInitialMotionX);
final float ady = Math.abs(y - mInitialMotionY);
final int slop = mDragHelper.getTouchSlop();
if (ady > slop && adx > ady || !isCapturableViewUnder((int) x, (int) y)) {
if (!mIsInNestedScroll) {
mDragHelper.cancel();
}
mIsUnableToDrag = true;
return false;
}
}
}
final boolean interceptForDrag = mDragHelper.shouldInterceptTouchEvent(ev);
return interceptForDrag;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (!mCanSlide) {
return super.onTouchEvent(ev);
}
mDragHelper.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;
break;
}
}
return wantTouchEvents;
}
private boolean closePane(View pane, int initialVelocity) {
if (mFirstLayout || smoothSlideTo(0.f, initialVelocity)) {
mPreservedOpenState = false;
return true;
}
return false;
}
private boolean openPane(View pane, int initialVelocity) {
if (mFirstLayout || smoothSlideTo(1.f, initialVelocity)) {
mPreservedOpenState = true;
return true;
}
return false;
}
private void updateSlideOffset(int offsetPx) {
mSlideOffsetPx = offsetPx;
mSlideOffset = (float) mSlideOffsetPx / mSlideRange;
}
/**
* Open the sliding pane if it is currently slideable. If first layout
* has already completed this will animate.
*
* @return true if the pane was slideable and is now open/in the process of opening
*/
public boolean openPane() {
return openPane(mSlideableView, 0);
}
/**
* Close the sliding pane if it is currently slideable. If first layout
* has already completed this will animate.
*
* @return true if the pane was slideable and is now closed/in the process of closing
*/
public boolean closePane() {
return closePane(mSlideableView, 0);
}
/**
* Check if the layout is open. It can be open either because the slider
* itself is open revealing the left pane, or if all content fits without sliding.
*
* @return true if sliding panels are open
*/
public boolean isOpen() {
return !mCanSlide || mSlideOffset > 0;
}
/**
* Check if the content in this layout cannot fully fit side by side and therefore
* the content pane can be slid back and forth.
*
* @return true if content in this layout can be slid open and closed
*/
public boolean isSlideable() {
return mCanSlide;
}
private void onPanelDragged(int newTop) {
if (mSlideableView == null) {
// This can happen if we're aborting motion during layout because everything now fits.
mSlideOffset = 0;
return;
}
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
final int lpMargin = lp.topMargin;
final int topBound = getPaddingTop() + lpMargin;
updateSlideOffset(newTop - topBound);
dispatchOnPanelSlide(mSlideableView);
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
boolean result;
final int save = canvas.save(Canvas.CLIP_SAVE_FLAG);
if (mCanSlide && !lp.slideable && mSlideableView != null) {
// Clip against the slider; no sense drawing what will immediately be covered.
canvas.getClipBounds(mTmpRect);
mTmpRect.bottom = Math.min(mTmpRect.bottom, mSlideableView.getTop());
canvas.clipRect(mTmpRect);
}
if (Build.VERSION.SDK_INT >= 11) { // HC
result = super.drawChild(canvas, child, drawingTime);
} else {
if (child.isDrawingCacheEnabled()) {
child.setDrawingCacheEnabled(false);
}
result = super.drawChild(canvas, child, drawingTime);
}
canvas.restoreToCount(save);
return result;
}
/**
* Smoothly animate mDraggingPane to the target X position within its range.
*
* @param slideOffset position to animate to
* @param velocity initial velocity in case of fling, or 0.
*/
boolean smoothSlideTo(float slideOffset, int velocity) {
if (!mCanSlide) {
// Nothing to do.
return false;
}
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
int y;
int topBound = getPaddingTop() + lp.topMargin;
y = (int) (topBound + slideOffset * mSlideRange);
if (mDragHelper.smoothSlideViewTo(mSlideableView, mSlideableView.getLeft(), y)) {
setAllChildrenVisible();
ViewCompat.postInvalidateOnAnimation(this);
return true;
}
return false;
}
@Override
public void computeScroll() {
if (mDragHelper.continueSettling(true)) {
if (!mCanSlide) {
mDragHelper.abort();
return;
}
ViewCompat.postInvalidateOnAnimation(this);
}
}
private boolean isCapturableViewUnder(int x, int y) {
View capturableView = mCapturableView != null ? mCapturableView : mSlideableView;
if (capturableView == null) {
return false;
}
int[] viewLocation = new int[2];
capturableView.getLocationOnScreen(viewLocation);
int[] parentLocation = new int[2];
this.getLocationOnScreen(parentLocation);
int screenX = parentLocation[0] + x;
int screenY = parentLocation[1] + y;
return screenX >= viewLocation[0]
&& screenX < viewLocation[0] + capturableView.getWidth()
&& screenY >= viewLocation[1]
&& screenY < viewLocation[1] + capturableView.getHeight();
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams();
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof 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);
}
@Override
protected Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.isOpen = isSlideable() ? isOpen() : mPreservedOpenState;
return ss;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
if (ss.isOpen) {
openPane();
} else {
closePane();
}
mPreservedOpenState = ss.isOpen;
}
@Override
public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
final boolean startNestedScroll = (nestedScrollAxes & SCROLL_AXIS_VERTICAL) != 0;
if (startNestedScroll) {
mIsInNestedScroll = true;
mChildCannotConsumeScroll = true;
mDragHelper.startNestedScroll(mSlideableView);
}
if (DEBUG) {
Log.d(TAG, "onStartNestedScroll: " + startNestedScroll);
}
return startNestedScroll;
}
@Override
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
if (dy == 0) {
// Nothing to do
return;
}
if (DEBUG) {
Log.d(TAG, "onNestedPreScroll: " + dy);
}
mInNestedPreScrollDownwards =
mChildCannotConsumeScroll && dy < 0 && mSlideOffsetPx <= mIntermediateOffset;
mDragHelper.processNestedScroll(mSlideableView, 0, -dy, consumed);
}
@Override
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed,
int dyUnconsumed) {
if (DEBUG) {
Log.d(TAG, "onNestedScroll: " + dyUnconsumed);
}
mChildCannotConsumeScroll = false;
mInNestedPreScrollDownwards = false;
mDragHelper.processNestedScroll(mSlideableView, 0, -dyUnconsumed, null);
}
@Override
public void onStopNestedScroll(View child) {
if (DEBUG) {
Log.d(TAG, "onStopNestedScroll");
}
if (mIsInNestedScroll) {
mDragHelper.stopNestedScroll(mSlideableView);
}
mIsInNestedScroll = false;
}
private class DragHelperCallback extends ViewDragHelper.Callback {
@Override
public boolean tryCaptureView(View child, int pointerId) {
if (mIsUnableToDrag) {
return false;
}
return ((LayoutParams) child.getLayoutParams()).slideable;
}
@Override
public void onViewDragStateChanged(int state) {
if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
if (mSlideOffset == 0) {
updateObscuredViewsVisibility(mSlideableView);
dispatchOnPanelClosed(mSlideableView);
mPreservedOpenState = false;
} else {
dispatchOnPanelOpened(mSlideableView);
mPreservedOpenState = true;
}
}
}
@Override
public void onViewCaptured(View capturedChild, int activePointerId) {
// Make all child views visible in preparation for sliding things around
setAllChildrenVisible();
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
onPanelDragged(top);
invalidate();
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
if (releasedChild == null) {
return;
}
final LayoutParams lp = (LayoutParams) releasedChild.getLayoutParams();
int top = getPaddingTop() + lp.topMargin;
if (mInNestedPreScrollDownwards) {
// Snap to the closest pinnable position based on the current slide offset
// (in pixels) [0 - mIntermediateoffset - mSlideRange]
if (yvel > 0) {
top += mSlideRange;
} else if (0 <= mSlideOffsetPx && mSlideOffsetPx <= mIntermediateOffset / 2) {
// Offset is between 0 and mIntermediateOffset, but closer to 0
// Leave top unchanged
} else if (mIntermediateOffset / 2 <= mSlideOffsetPx
&& mSlideOffsetPx <= (mIntermediateOffset + mSlideRange) / 2) {
// Offset is closest to mIntermediateOffset
top += mIntermediateOffset;
} else {
// Offset is between mIntermediateOffset and mSlideRange, but closer to
// mSlideRange
top += mSlideRange;
}
} else if (yvel > 0 || (yvel == 0 && mSlideOffset > 0.5f)) {
top += mSlideRange;
}
mDragHelper.settleCapturedViewAt(releasedChild.getLeft(), top);
invalidate();
}
@Override
public int getViewVerticalDragRange(View child) {
return mSlideRange;
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
// Make sure we never move views horizontally.
return child.getLeft();
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
final int newTop;
int topBound = getPaddingTop() + lp.topMargin;
int bottomBound = topBound
+ (mInNestedPreScrollDownwards ? mIntermediateOffset : mSlideRange);
newTop = Math.min(Math.max(top, topBound), bottomBound);
return newTop;
}
@Override
public void onEdgeDragStarted(int edgeFlags, int pointerId) {
mDragHelper.captureChildView(mSlideableView, pointerId);
}
}
public static class LayoutParams extends ViewGroup.MarginLayoutParams {
private static final int[] ATTRS = new int[] {
android.R.attr.layout_weight
};
/**
* The weighted proportion of how much of the leftover space
* this child should consume after measurement.
*/
public float weight = 0;
/**
* True if this pane is the slideable pane in the layout.
*/
boolean slideable;
public LayoutParams() {
super(FILL_PARENT, FILL_PARENT);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(android.view.ViewGroup.LayoutParams source) {
super(source);
}
public LayoutParams(MarginLayoutParams source) {
super(source);
}
public LayoutParams(LayoutParams source) {
super(source);
this.weight = source.weight;
}
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
final TypedArray a = c.obtainStyledAttributes(attrs, ATTRS);
this.weight = a.getFloat(0, 0);
a.recycle();
}
}
static class SavedState extends BaseSavedState {
boolean isOpen;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
isOpen = in.readInt() != 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(isOpen ? 1 : 0);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
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);
copyNodeInfoNoChildren(info, superNode);
superNode.recycle();
info.setClassName(OverlappingPaneLayout.class.getName());
info.setSource(host);
final ViewParent parent = ViewCompat.getParentForAccessibility(host);
if (parent instanceof View) {
info.setParent((View) parent);
}
// This is a best-approximation of addChildrenForAccessibility()
// that accounts for filtering.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.VISIBLE) {
// Force importance to "yes" since we can't read the value.
ViewCompat.setImportantForAccessibility(
child, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
info.addChild(child);
}
}
}
@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(host, event);
event.setClassName(OverlappingPaneLayout.class.getName());
}
/**
* 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());
dest.setMovementGranularities(src.getMovementGranularities());
}
}
}
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