Back to project page SlidingUpPaneLayout.
The source code is released under:
Apache License
If you think the Android project SlidingUpPaneLayout listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
package com.chenjishi.slideupdemo; //w ww . j a va 2 s . c om import android.content.Context; import android.content.res.TypedArray; import android.graphics.*; 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.support.v4.widget.ViewDragHelper; 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; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.util.ArrayList; /** * Created by chenjishi on 14/11/5. */ public class SlidingUpPaneLayout extends ViewGroup { private static final String TAG = "SlidingUpPaneLayout"; /** * 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; /** * The fade color used for the sliding panel. 0 = no fading. */ private int mSliderFadeColor = DEFAULT_FADE_COLOR; /** * Minimum velocity that will be detected as a fling */ private static final int MIN_FLING_VELOCITY = 400; // dips per second /** * The fade color used for the panel covered by the slider. 0 = no fading. */ private int mCoveredFadeColor; /** * Drawable used to draw the shadow between panes by default. */ private Drawable mShadowDrawableTop; /** * 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; /** * How far the panel is offset from its closed position. * range [0, 1] where 0 = closed, 1 = open. */ private float mSlideOffset; /** * How far the non-sliding panel is parallaxed from its usual position when open. * range [0, 1] */ private float mParallaxOffset; /** * 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; /** * Distance in pixels to parallax the fixed pane by when fully closed */ private int mParallaxBy; 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 ArrayList<DisableLayerRunnable> mPostedRunnables = new ArrayList<DisableLayerRunnable>(); private final Rect mTmpRect = new Rect(); static final SlidingPanelLayoutImpl IMPL; static { final int deviceVersion = Build.VERSION.SDK_INT; if (deviceVersion >= 17) { IMPL = new SlidingPanelLayoutImplJBMR1(); } else if (deviceVersion >= 16) { IMPL = new SlidingPanelLayoutImplJB(); } else { IMPL = new SlidingPanelLayoutImplBase(); } } public interface PanelSlideListener { public void onPanelSlide(View panel, float slideOffset); public void onPanelOpened(View panel); public void onPanelClosed(View panel); } public SlidingUpPaneLayout(Context context) { this(context, null); } public SlidingUpPaneLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlidingUpPaneLayout(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); } public void setParallaxDistance(int parallaxBy) { mParallaxBy = parallaxBy; requestLayout(); } public int getParallaxDistance() { return mParallaxBy; } public void setSliderFadeColor(int color) { mSliderFadeColor = color; } public int getSliderFadeColor() { return mSliderFadeColor; } public void setCoveredFadeColor(int color) { mCoveredFadeColor = color; } public int getCoveredFadeColor() { return mCoveredFadeColor; } public void setPanelSlideListener(PanelSlideListener listener) { mPanelSlideListener = listener; } void dispatchOnPanelOpened(View panel) { if (mPanelSlideListener != null) { mPanelSlideListener.onPanelOpened(panel); } sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED); } void dispatchOnPanelSlide(View panel) { if (mPanelSlideListener != null) { mPanelSlideListener.onPanelSlide(panel, mSlideOffset); } } 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) { break; } final int clampedChildTop = Math.max(startBound, child.getTop()); final int clampedChildLeft = Math.max(leftBound, child.getLeft()); final int clampedChildBottom = Math.min(endBound, child.getBottom()); final int clampedChildRight = Math.min(rightBound, child.getRight()); 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 void onPanelDragged(int newTop) { if (mSlideableView == null) { mSlideOffset = 0; return; } final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); final int newStart = newTop; final int paddingStart = getPaddingTop(); final int lpMargin = lp.topMargin; final int startBound = paddingStart + lpMargin; mSlideOffset = (float) (newStart - startBound) / mSlideRange; if (mParallaxBy != 0) { parallaxOtherViews(mSlideOffset); } if (lp.dimWhenOffset) { dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor); } dispatchOnPanelSlide(mSlideableView); } private void parallaxOtherViews(float slideOffset) { final LayoutParams slideLp = (LayoutParams) mSlideableView.getLayoutParams(); final boolean dimViews = slideLp.dimWhenOffset && slideLp.topMargin <= 0; final int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { final View v = getChildAt(i); if (v == mSlideableView) continue; final int oldOffset = (int) ((1 - mParallaxOffset) * mParallaxBy); mParallaxOffset = slideOffset; final int newOffset = (int) ((1 - slideOffset) * mParallaxBy); final int dy = oldOffset - newOffset; v.offsetTopAndBottom(dy); if (dimViews) { dimChildView(v, 1 - mParallaxOffset, mCoveredFadeColor); } } } private void dimChildView(View v, float mag, int fadeColor) { final LayoutParams lp = (LayoutParams) v.getLayoutParams(); if (mag > 0 && fadeColor != 0) { final int baseAlpha = (fadeColor & 0xff000000) >>> 24; int imag = (int) (baseAlpha * mag); int color = imag << 24 | (fadeColor & 0xffffff); if (lp.dimPaint == null) { lp.dimPaint = new Paint(); } lp.dimPaint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_OVER)); if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_HARDWARE) { ViewCompat.setLayerType(v, ViewCompat.LAYER_TYPE_HARDWARE, lp.dimPaint); } invalidateChildRegion(v); } else if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_NONE) { if (lp.dimPaint != null) { lp.dimPaint.setColorFilter(null); } final DisableLayerRunnable dlr = new DisableLayerRunnable(v); mPostedRunnables.add(dlr); ViewCompat.postOnAnimation(this, dlr); } } private static boolean viewIsOpaque(View v) { if (ViewCompat.isOpaque(v)) return true; // View#isOpaque didn't take all valid opaque scrollbar modes into account // before API 18 (JB-MR2). On newer devices rely solely on isOpaque above and return false // here. On older devices, check the view's background drawable directly as a fallback. if (Build.VERSION.SDK_INT >= 18) return false; 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; for (int i = 0, count = mPostedRunnables.size(); i < count; i++) { final DisableLayerRunnable dlr = mPostedRunnables.get(i); dlr.run(); } mPostedRunnables.clear(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); super.onMeasure(widthMeasureSpec, heightMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); if (heightMode != MeasureSpec.EXACTLY) { if (isInEditMode()) { if (heightMode == MeasureSpec.AT_MOST) { heightMode = MeasureSpec.EXACTLY; } else if (heightMode == MeasureSpec.UNSPECIFIED) { heightMode = MeasureSpec.EXACTLY; heightSize = 300; } } else { throw new IllegalStateException("Height must have an exact value or MATCH_PARENT"); } } else if (widthMode == MeasureSpec.UNSPECIFIED) { if (isInEditMode()) { widthMode = MeasureSpec.AT_MOST; widthSize = 300; } else { throw new IllegalStateException("Width 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) { lp.dimWhenOffset = false; 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 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); } 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); } 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.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); } 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(child.getMeasuredWidth(), MeasureSpec.EXACTLY); } } else { childWidthSpec = MeasureSpec.makeMeasureSpec(child.getMeasuredWidth(), MeasureSpec.EXACTLY); } if (canSlide) { 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 height 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 paddingStart = getPaddingTop(); final int paddingEnd = getPaddingBottom(); final int paddingLeft = getPaddingLeft(); final int childCount = getChildCount(); int yStart = paddingStart; 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(); int offset = 0; if (lp.slideable) { final int margin = lp.topMargin + lp.bottomMargin; final int range = Math.min(nextYStart, height - paddingEnd - mOverhangSize) - yStart - margin; mSlideRange = range; final int lpMargin = lp.topMargin; lp.dimWhenOffset = yStart + lpMargin + range + childHeight / 2 > height - paddingEnd; final int pos = (int) (range * mSlideOffset); yStart += pos + lpMargin; mSlideOffset = (float) pos / mSlideRange; } else if (mCanSlide && mParallaxBy != 0) { offset = (int) ((1 - mSlideOffset) * mParallaxBy); yStart = nextYStart; } else { yStart = nextYStart; } final int childTop = yStart - offset; final int childBottom = childTop + childHeight; final int childLeft = paddingLeft; final int childRight = childLeft + child.getMeasuredWidth(); child.layout(paddingLeft, childTop, childRight, childBottom); nextYStart += child.getHeight(); } if (mFirstLayout) { if (mCanSlide) { if (mParallaxBy != 0) { parallaxOtherViews(mSlideOffset); } if (((LayoutParams) mSlideableView.getLayoutParams()).dimWhenOffset) { dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor); } } else { // Reset the dim level of all children; it's irrelevant when nothing moves. for (int i = 0; i < childCount; i++) { dimChildView(getChildAt(i), 0, mSliderFadeColor); } } 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 (w != oldw) { 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)) { mDragHelper.cancel(); return super.onInterceptTouchEvent(ev); } if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { mDragHelper.cancel(); } boolean interceptTap = false; switch (action) { case MotionEvent.ACTION_DOWN: { mIsUnableToDrag = false; final float x = ev.getX(); final float y = ev.getY(); mInitialMotionX = x; mInitialMotionY = y; if (mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y) && isDimmed(mSlideableView)) { interceptTap = true; } 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) { mDragHelper.cancel(); mIsUnableToDrag = true; return false; } } } final boolean interceptForDrag = mDragHelper.shouldInterceptTouchEvent(ev); return interceptForDrag || interceptTap; } @Override public boolean onTouchEvent(MotionEvent event) { if (!mCanSlide) return super.onTouchEvent(event); mDragHelper.processTouchEvent(event); final int action = event.getAction(); boolean wantTouchEvents = true; switch (action & MotionEventCompat.ACTION_MASK) { case MotionEvent.ACTION_DOWN: { final float x = event.getX(); final float y = event.getY(); mInitialMotionX = x; mInitialMotionY = y; break; } case MotionEvent.ACTION_UP: { if (isDimmed(mSlideableView)) { final float x = event.getX(); final float y = event.getY(); final float dx = x - mInitialMotionX; final float dy = y - mInitialMotionY; final int slop = mDragHelper.getTouchSlop(); if (dx * dx + dy * dy < slop * slop && mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y)) { // Taps close a dimmed open pane. closePane(mSlideableView, 0); break; } } 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; } public boolean openPane() { return openPane(mSlideableView, 0); } public boolean closePane() { return closePane(mSlideableView, 0); } public boolean isOpen() { return !mCanSlide || mSlideOffset == 1; } public boolean isSlideable() { return mCanSlide; } @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) { result = super.drawChild(canvas, child, drawingTime); } else { if (lp.dimWhenOffset && mSlideOffset > 0) { if (!child.isDrawingCacheEnabled()) { child.setDrawingCacheEnabled(true); } final Bitmap cache = child.getDrawingCache(); if (cache != null) { canvas.drawBitmap(cache, child.getLeft(), child.getTop(), lp.dimPaint); result = false; } else { result = super.drawChild(canvas, child, drawingTime); } } else { if (child.isDrawingCacheEnabled()) { child.setDrawingCacheEnabled(false); } result = super.drawChild(canvas, child, drawingTime); } } canvas.restoreToCount(save); return result; } private void invalidateChildRegion(View v) { IMPL.invalidateChildRegion(this, v); } boolean smoothSlideTo(float slideOffset, int velocity) { if (!mCanSlide) return false; final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); int startBound = getPaddingTop() + lp.topMargin; int y = (int) (startBound + 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); } } public void setShadowDrawableTop(Drawable d) { mShadowDrawableTop = d; } public void setShadowResourceTop(int resId) { setShadowDrawableTop(getResources().getDrawable(resId)); } @Override public void draw(Canvas canvas) { super.draw(canvas); Drawable shadowDrawable = mShadowDrawableTop; final View shadowView = getChildCount() > 1 ? getChildAt(1) : null; if (shadowView == null || shadowDrawable == null) return; final int left = shadowView.getLeft(); final int right = shadowView.getRight(); final int shadowHeight = shadowDrawable.getIntrinsicHeight(); final int top; final int bottom; bottom = shadowView.getTop(); top = bottom - shadowHeight; shadowDrawable.setBounds(left, top, right, bottom); shadowDrawable.draw(canvas); } protected boolean canScroll(View v, boolean checkV, int dy, int x, int y) { if (v instanceof ViewGroup) { final ViewGroup group = (ViewGroup) v; final int scrollX = v.getScrollX(); final int scrollY = v.getScrollY(); final int count = group.getChildCount(); // Count backwards - let topmost views consume scroll distance first. for (int i = count - 1; i >= 0; i--) { // TODO: Add versioned support here for transformed views. // This will not work for transformed views in Honeycomb+ final View child = group.getChildAt(i); if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() && y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && canScroll(child, true, dy, x + scrollX - child.getLeft(), y + scrollY - child.getTop())) { return true; } } } return checkV && ViewCompat.canScrollVertically(v, -dy); } boolean isDimmed(View child) { if (child == null) return false; final LayoutParams lp = (LayoutParams) child.getLayoutParams(); return mCanSlide && lp.dimWhenOffset && mSlideOffset > 0; } @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(state); if (ss.isOpen) { openPane(); } else { closePane(); } mPreservedOpenState = ss.isOpen; } static class SavedState extends BaseSavedState { boolean isOpen; SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel source) { super(source); isOpen = source.readInt() != 0; } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); dest.writeInt(isOpen ? 1 : 0); } public static final Creator<SavedState> CREATOR = new Creator<SavedState>() { public SavedState createFromParcel(Parcel in) { return new SavedState(in); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; } private class DisableLayerRunnable implements Runnable { final View mChildView; DisableLayerRunnable(View childView) { mChildView = childView; } @Override public void run() { if (mChildView.getParent() == SlidingUpPaneLayout.this) { ViewCompat.setLayerType(mChildView, ViewCompat.LAYER_TYPE_NONE, null); invalidateChildRegion(mChildView); } mPostedRunnables.remove(this); } } public static class LayoutParams extends 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; /** * True if this view should be drawn dimmed * when it's been offset from its default position. */ boolean dimWhenOffset; Paint dimPaint; public LayoutParams() { super(MATCH_PARENT, MATCH_PARENT); } public LayoutParams(int width, int height) { super(width, height); } public LayoutParams(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(); } } interface SlidingPanelLayoutImpl { void invalidateChildRegion(SlidingUpPaneLayout parent, View child); } static class SlidingPanelLayoutImplBase implements SlidingPanelLayoutImpl { @Override public void invalidateChildRegion(SlidingUpPaneLayout parent, View child) { ViewCompat.postInvalidateOnAnimation(parent, child.getLeft(), child.getTop(), child.getRight(), child.getBottom()); } } static class SlidingPanelLayoutImplJB extends SlidingPanelLayoutImplBase { /* * Private API hacks! Nasty! Bad! * * In Jellybean, some optimizations in the hardware UI renderer * prevent a changed Paint on a View using a hardware layer from having * the intended effect. This twiddles some internal bits on the view to force * it to recreate the display list. */ private Method mGetDisplayList; private Field mRecreateDisplayList; SlidingPanelLayoutImplJB() { try { mGetDisplayList = View.class.getDeclaredMethod("getDisplayList", (Class[]) null); } catch (NoSuchMethodException e) { Log.e(TAG, "Couldn't fetch getDisplayList method; dimming won't work right.", e); } try { mRecreateDisplayList = View.class.getDeclaredField("mRecreateDisplayList"); mRecreateDisplayList.setAccessible(true); } catch (NoSuchFieldException e) { Log.e(TAG, "Couldn't fetch mRecreateDisplayList field; dimming will be slow.", e); } } @Override public void invalidateChildRegion(SlidingUpPaneLayout parent, View child) { if (mGetDisplayList != null && mRecreateDisplayList != null) { try { mRecreateDisplayList.setBoolean(child, true); mGetDisplayList.invoke(child, (Object[]) null); } catch (Exception e) { Log.e(TAG, "Error refreshing display list state", e); } } else { // Slow path. REALLY slow path. Let's hope we don't get here. child.invalidate(); return; } super.invalidateChildRegion(parent, child); } } static class SlidingPanelLayoutImplJBMR1 extends SlidingPanelLayoutImplBase { @Override public void invalidateChildRegion(SlidingUpPaneLayout parent, View child) { ViewCompat.setLayerPaint(child, ((LayoutParams) child.getLayoutParams()).dimPaint); } } 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(SlidingUpPaneLayout.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 (!filter(child) && (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(SlidingUpPaneLayout.class.getName()); } @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) { return isDimmed(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()); dest.setMovementGranularities(src.getMovementGranularities()); } } 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) { 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) { final LayoutParams lp = (LayoutParams) releasedChild.getLayoutParams(); int top = getPaddingTop() + lp.topMargin; 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) { return child.getLeft(); } @Override public int clampViewPositionVertical(View child, int top, int dy) { final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); int startBound = getPaddingTop() + lp.topMargin; int endBound = startBound + mSlideRange; final int newTop = Math.min(Math.max(top, startBound), endBound); return newTop; } @Override public void onEdgeDragStarted(int edgeFlags, int pointerId) { mDragHelper.captureChildView(mSlideableView, pointerId); } } }