Fix black bar drawn sometimes when swiping away items in Recents
- move drawing of faded black edges to RecentsPanelView
- invalidate RecentsPanelView when scroll value of Recents*ScrollView changes
Bug: 10022236
Change-Id: Idb102fb2454c2a077920b770e25c449ccd33486e
diff --git a/packages/SystemUI/src/com/android/systemui/recent/FadedEdgeDrawHelper.java b/packages/SystemUI/src/com/android/systemui/recent/FadedEdgeDrawHelper.java
new file mode 100644
index 0000000..1cfc892
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/recent/FadedEdgeDrawHelper.java
@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2011 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.systemui.recent;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.LinearGradient;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.Shader;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewConfiguration;
+import android.widget.LinearLayout;
+
+import com.android.systemui.R;
+
+public class FadedEdgeDrawHelper {
+ public static final boolean OPTIMIZE_SW_RENDERED_RECENTS = true;
+ public static final boolean USE_DARK_FADE_IN_HW_ACCELERATED_MODE = true;
+ private View mScrollView;
+
+ private int mFadingEdgeLength;
+ private boolean mIsVertical;
+ private boolean mSoftwareRendered = false;
+ private Paint mBlackPaint;
+ private Paint mFadePaint;
+ private Matrix mFadeMatrix;
+ private LinearGradient mFade;
+
+ public static FadedEdgeDrawHelper create(Context context,
+ AttributeSet attrs, View scrollView, boolean isVertical) {
+ boolean isTablet = context.getResources().
+ getBoolean(R.bool.config_recents_interface_for_tablets);
+ if (!isTablet && (OPTIMIZE_SW_RENDERED_RECENTS || USE_DARK_FADE_IN_HW_ACCELERATED_MODE)) {
+ return new FadedEdgeDrawHelper(context, attrs, scrollView, isVertical);
+ } else {
+ return null;
+ }
+ }
+
+ public FadedEdgeDrawHelper(Context context,
+ AttributeSet attrs, View scrollView, boolean isVertical) {
+ mScrollView = scrollView;
+ TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View);
+ mFadingEdgeLength = a.getDimensionPixelSize(android.R.styleable.View_fadingEdgeLength,
+ ViewConfiguration.get(context).getScaledFadingEdgeLength());
+ mIsVertical = isVertical;
+ }
+
+ public void onAttachedToWindowCallback(
+ LinearLayout layout, boolean hardwareAccelerated) {
+ mSoftwareRendered = !hardwareAccelerated;
+ if ((mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS)
+ || USE_DARK_FADE_IN_HW_ACCELERATED_MODE) {
+ mScrollView.setVerticalFadingEdgeEnabled(false);
+ mScrollView.setHorizontalFadingEdgeEnabled(false);
+ }
+ }
+
+ public void addViewCallback(View newLinearLayoutChild) {
+ if (mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS) {
+ final RecentsPanelView.ViewHolder holder =
+ (RecentsPanelView.ViewHolder) newLinearLayoutChild.getTag();
+ holder.labelView.setDrawingCacheEnabled(true);
+ holder.labelView.buildDrawingCache();
+ }
+ }
+
+ public void drawCallback(Canvas canvas,
+ int left, int right, int top, int bottom, int scrollX, int scrollY,
+ float topFadingEdgeStrength, float bottomFadingEdgeStrength,
+ float leftFadingEdgeStrength, float rightFadingEdgeStrength, int mPaddingTop) {
+
+ if ((mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS)
+ || USE_DARK_FADE_IN_HW_ACCELERATED_MODE) {
+ if (mFadePaint == null) {
+ mFadePaint = new Paint();
+ mFadeMatrix = new Matrix();
+ // use use a height of 1, and then wack the matrix each time we
+ // actually use it.
+ mFade = new LinearGradient(0, 0, 0, 1, 0xCC000000, 0, Shader.TileMode.CLAMP);
+ // PULL OUT THIS CONSTANT
+ mFadePaint.setShader(mFade);
+ }
+
+ // draw the fade effect
+ boolean drawTop = false;
+ boolean drawBottom = false;
+ boolean drawLeft = false;
+ boolean drawRight = false;
+
+ float topFadeStrength = 0.0f;
+ float bottomFadeStrength = 0.0f;
+ float leftFadeStrength = 0.0f;
+ float rightFadeStrength = 0.0f;
+
+ final float fadeHeight = mFadingEdgeLength;
+ int length = (int) fadeHeight;
+
+ // clip the fade length if top and bottom fades overlap
+ // overlapping fades produce odd-looking artifacts
+ if (mIsVertical && (top + length > bottom - length)) {
+ length = (bottom - top) / 2;
+ }
+
+ // also clip horizontal fades if necessary
+ if (!mIsVertical && (left + length > right - length)) {
+ length = (right - left) / 2;
+ }
+
+ if (mIsVertical) {
+ topFadeStrength = Math.max(0.0f, Math.min(1.0f, topFadingEdgeStrength));
+ drawTop = topFadeStrength * fadeHeight > 1.0f;
+ bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, bottomFadingEdgeStrength));
+ drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
+ }
+
+ if (!mIsVertical) {
+ leftFadeStrength = Math.max(0.0f, Math.min(1.0f, leftFadingEdgeStrength));
+ drawLeft = leftFadeStrength * fadeHeight > 1.0f;
+ rightFadeStrength = Math.max(0.0f, Math.min(1.0f, rightFadingEdgeStrength));
+ drawRight = rightFadeStrength * fadeHeight > 1.0f;
+ }
+
+ if (drawTop) {
+ mFadeMatrix.setScale(1, fadeHeight * topFadeStrength);
+ mFadeMatrix.postTranslate(left, top);
+ mFade.setLocalMatrix(mFadeMatrix);
+ canvas.drawRect(left, top, right, top + length, mFadePaint);
+
+ if (mBlackPaint == null) {
+ // Draw under the status bar at the top
+ mBlackPaint = new Paint();
+ mBlackPaint.setColor(0xFF000000);
+ }
+ canvas.drawRect(left, top - mPaddingTop, right, top, mBlackPaint);
+ }
+
+ if (drawBottom) {
+ mFadeMatrix.setScale(1, fadeHeight * bottomFadeStrength);
+ mFadeMatrix.postRotate(180);
+ mFadeMatrix.postTranslate(left, bottom);
+ mFade.setLocalMatrix(mFadeMatrix);
+ canvas.drawRect(left, bottom - length, right, bottom, mFadePaint);
+ }
+
+ if (drawLeft) {
+ mFadeMatrix.setScale(1, fadeHeight * leftFadeStrength);
+ mFadeMatrix.postRotate(-90);
+ mFadeMatrix.postTranslate(left, top);
+ mFade.setLocalMatrix(mFadeMatrix);
+ canvas.drawRect(left, top, left + length, bottom, mFadePaint);
+ }
+
+ if (drawRight) {
+ mFadeMatrix.setScale(1, fadeHeight * rightFadeStrength);
+ mFadeMatrix.postRotate(90);
+ mFadeMatrix.postTranslate(right, top);
+ mFade.setLocalMatrix(mFadeMatrix);
+ canvas.drawRect(right - length, top, right, bottom, mFadePaint);
+ }
+ }
+ }
+
+ public int getVerticalFadingEdgeLength() {
+ return mFadingEdgeLength;
+ }
+
+ public int getHorizontalFadingEdgeLength() {
+ return mFadingEdgeLength;
+ }
+
+}