| /* |
| * 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; |
| } |
| |
| } |