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/*
* 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;
}
}
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