| /* |
| * Copyright (C) 2017 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.launcher3.folder; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ObjectAnimator; |
| import android.animation.ValueAnimator; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Matrix; |
| import android.graphics.Paint; |
| import android.graphics.Path; |
| import android.graphics.PorterDuff; |
| import android.graphics.PorterDuffXfermode; |
| import android.graphics.RadialGradient; |
| import android.graphics.Region; |
| import android.graphics.Shader; |
| import android.util.Property; |
| import android.view.View; |
| |
| import com.android.launcher3.CellLayout; |
| import com.android.launcher3.DeviceProfile; |
| import com.android.launcher3.Launcher; |
| import com.android.launcher3.R; |
| import com.android.launcher3.util.Themes; |
| |
| import androidx.core.graphics.ColorUtils; |
| |
| /** |
| * This object represents a FolderIcon preview background. It stores drawing / measurement |
| * information, handles drawing, and animation (accept state <--> rest state). |
| */ |
| public class PreviewBackground { |
| |
| private static final int CONSUMPTION_ANIMATION_DURATION = 100; |
| |
| private final PorterDuffXfermode mClipPorterDuffXfermode |
| = new PorterDuffXfermode(PorterDuff.Mode.DST_IN); |
| // Create a RadialGradient such that it draws a black circle and then extends with |
| // transparent. To achieve this, we keep the gradient to black for the range [0, 1) and |
| // just at the edge quickly change it to transparent. |
| private final RadialGradient mClipShader = new RadialGradient(0, 0, 1, |
| new int[] {Color.BLACK, Color.BLACK, Color.TRANSPARENT }, |
| new float[] {0, 0.999f, 1}, |
| Shader.TileMode.CLAMP); |
| |
| private final PorterDuffXfermode mShadowPorterDuffXfermode |
| = new PorterDuffXfermode(PorterDuff.Mode.DST_OUT); |
| private RadialGradient mShadowShader = null; |
| |
| private final Matrix mShaderMatrix = new Matrix(); |
| private final Path mPath = new Path(); |
| |
| private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| |
| float mScale = 1f; |
| private float mColorMultiplier = 1f; |
| private int mBgColor; |
| private int mBadgeColor; |
| private float mStrokeWidth; |
| private int mStrokeAlpha = MAX_BG_OPACITY; |
| private int mShadowAlpha = 255; |
| private View mInvalidateDelegate; |
| |
| int previewSize; |
| int basePreviewOffsetX; |
| int basePreviewOffsetY; |
| |
| private CellLayout mDrawingDelegate; |
| public int delegateCellX; |
| public int delegateCellY; |
| |
| // When the PreviewBackground is drawn under an icon (for creating a folder) the border |
| // should not occlude the icon |
| public boolean isClipping = true; |
| |
| // Drawing / animation configurations |
| private static final float ACCEPT_SCALE_FACTOR = 1.20f; |
| private static final float ACCEPT_COLOR_MULTIPLIER = 1.5f; |
| |
| // Expressed on a scale from 0 to 255. |
| private static final int BG_OPACITY = 160; |
| private static final int MAX_BG_OPACITY = 225; |
| private static final int SHADOW_OPACITY = 40; |
| |
| private ValueAnimator mScaleAnimator; |
| private ObjectAnimator mStrokeAlphaAnimator; |
| private ObjectAnimator mShadowAnimator; |
| |
| private static final Property<PreviewBackground, Integer> STROKE_ALPHA = |
| new Property<PreviewBackground, Integer>(Integer.class, "strokeAlpha") { |
| @Override |
| public Integer get(PreviewBackground previewBackground) { |
| return previewBackground.mStrokeAlpha; |
| } |
| |
| @Override |
| public void set(PreviewBackground previewBackground, Integer alpha) { |
| previewBackground.mStrokeAlpha = alpha; |
| previewBackground.invalidate(); |
| } |
| }; |
| |
| private static final Property<PreviewBackground, Integer> SHADOW_ALPHA = |
| new Property<PreviewBackground, Integer>(Integer.class, "shadowAlpha") { |
| @Override |
| public Integer get(PreviewBackground previewBackground) { |
| return previewBackground.mShadowAlpha; |
| } |
| |
| @Override |
| public void set(PreviewBackground previewBackground, Integer alpha) { |
| previewBackground.mShadowAlpha = alpha; |
| previewBackground.invalidate(); |
| } |
| }; |
| |
| public void setup(Launcher launcher, View invalidateDelegate, |
| int availableSpaceX, int topPadding) { |
| mInvalidateDelegate = invalidateDelegate; |
| mBgColor = Themes.getAttrColor(launcher, android.R.attr.colorPrimary); |
| mBadgeColor = Themes.getAttrColor(launcher, R.attr.folderBadgeColor); |
| |
| DeviceProfile grid = launcher.getDeviceProfile(); |
| previewSize = grid.folderIconSizePx; |
| |
| basePreviewOffsetX = (availableSpaceX - previewSize) / 2; |
| basePreviewOffsetY = topPadding + grid.folderIconOffsetYPx; |
| |
| // Stroke width is 1dp |
| mStrokeWidth = launcher.getResources().getDisplayMetrics().density; |
| |
| float radius = getScaledRadius(); |
| float shadowRadius = radius + mStrokeWidth; |
| int shadowColor = Color.argb(SHADOW_OPACITY, 0, 0, 0); |
| mShadowShader = new RadialGradient(0, 0, 1, |
| new int[] {shadowColor, Color.TRANSPARENT}, |
| new float[] {radius / shadowRadius, 1}, |
| Shader.TileMode.CLAMP); |
| |
| invalidate(); |
| } |
| |
| int getRadius() { |
| return previewSize / 2; |
| } |
| |
| int getScaledRadius() { |
| return (int) (mScale * getRadius()); |
| } |
| |
| int getOffsetX() { |
| return basePreviewOffsetX - (getScaledRadius() - getRadius()); |
| } |
| |
| int getOffsetY() { |
| return basePreviewOffsetY - (getScaledRadius() - getRadius()); |
| } |
| |
| /** |
| * Returns the progress of the scale animation, where 0 means the scale is at 1f |
| * and 1 means the scale is at ACCEPT_SCALE_FACTOR. |
| */ |
| float getScaleProgress() { |
| return (mScale - 1f) / (ACCEPT_SCALE_FACTOR - 1f); |
| } |
| |
| void invalidate() { |
| if (mInvalidateDelegate != null) { |
| mInvalidateDelegate.invalidate(); |
| } |
| |
| if (mDrawingDelegate != null) { |
| mDrawingDelegate.invalidate(); |
| } |
| } |
| |
| void setInvalidateDelegate(View invalidateDelegate) { |
| mInvalidateDelegate = invalidateDelegate; |
| invalidate(); |
| } |
| |
| public int getBgColor() { |
| int alpha = (int) Math.min(MAX_BG_OPACITY, BG_OPACITY * mColorMultiplier); |
| return ColorUtils.setAlphaComponent(mBgColor, alpha); |
| } |
| |
| public int getBadgeColor() { |
| return mBadgeColor; |
| } |
| |
| public void drawBackground(Canvas canvas) { |
| mPaint.setStyle(Paint.Style.FILL); |
| mPaint.setColor(getBgColor()); |
| |
| drawCircle(canvas, 0 /* deltaRadius */); |
| |
| drawShadow(canvas); |
| } |
| |
| public void drawShadow(Canvas canvas) { |
| if (mShadowShader == null) { |
| return; |
| } |
| |
| float radius = getScaledRadius(); |
| float shadowRadius = radius + mStrokeWidth; |
| mPaint.setStyle(Paint.Style.FILL); |
| mPaint.setColor(Color.BLACK); |
| int offsetX = getOffsetX(); |
| int offsetY = getOffsetY(); |
| final int saveCount; |
| if (canvas.isHardwareAccelerated()) { |
| saveCount = canvas.saveLayer(offsetX - mStrokeWidth, offsetY, |
| offsetX + radius + shadowRadius, offsetY + shadowRadius + shadowRadius, null); |
| |
| } else { |
| saveCount = canvas.save(); |
| canvas.clipPath(getClipPath(), Region.Op.DIFFERENCE); |
| } |
| |
| mShaderMatrix.setScale(shadowRadius, shadowRadius); |
| mShaderMatrix.postTranslate(radius + offsetX, shadowRadius + offsetY); |
| mShadowShader.setLocalMatrix(mShaderMatrix); |
| mPaint.setAlpha(mShadowAlpha); |
| mPaint.setShader(mShadowShader); |
| canvas.drawPaint(mPaint); |
| mPaint.setAlpha(255); |
| mPaint.setShader(null); |
| if (canvas.isHardwareAccelerated()) { |
| mPaint.setXfermode(mShadowPorterDuffXfermode); |
| canvas.drawCircle(radius + offsetX, radius + offsetY, radius, mPaint); |
| mPaint.setXfermode(null); |
| } |
| |
| canvas.restoreToCount(saveCount); |
| } |
| |
| public void fadeInBackgroundShadow() { |
| if (mShadowAnimator != null) { |
| mShadowAnimator.cancel(); |
| } |
| mShadowAnimator = ObjectAnimator |
| .ofInt(this, SHADOW_ALPHA, 0, 255) |
| .setDuration(100); |
| mShadowAnimator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| mShadowAnimator = null; |
| } |
| }); |
| mShadowAnimator.start(); |
| } |
| |
| public void animateBackgroundStroke() { |
| if (mStrokeAlphaAnimator != null) { |
| mStrokeAlphaAnimator.cancel(); |
| } |
| mStrokeAlphaAnimator = ObjectAnimator |
| .ofInt(this, STROKE_ALPHA, MAX_BG_OPACITY / 2, MAX_BG_OPACITY) |
| .setDuration(100); |
| mStrokeAlphaAnimator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| mStrokeAlphaAnimator = null; |
| } |
| }); |
| mStrokeAlphaAnimator.start(); |
| } |
| |
| public void drawBackgroundStroke(Canvas canvas) { |
| mPaint.setColor(ColorUtils.setAlphaComponent(mBgColor, mStrokeAlpha)); |
| mPaint.setStyle(Paint.Style.STROKE); |
| mPaint.setStrokeWidth(mStrokeWidth); |
| drawCircle(canvas, 1 /* deltaRadius */); |
| } |
| |
| public void drawLeaveBehind(Canvas canvas) { |
| float originalScale = mScale; |
| mScale = 0.5f; |
| |
| mPaint.setStyle(Paint.Style.FILL); |
| mPaint.setColor(Color.argb(160, 245, 245, 245)); |
| drawCircle(canvas, 0 /* deltaRadius */); |
| |
| mScale = originalScale; |
| } |
| |
| private void drawCircle(Canvas canvas,float deltaRadius) { |
| float radius = getScaledRadius(); |
| canvas.drawCircle(radius + getOffsetX(), radius + getOffsetY(), |
| radius - deltaRadius, mPaint); |
| } |
| |
| public Path getClipPath() { |
| mPath.reset(); |
| float r = getScaledRadius(); |
| mPath.addCircle(r + getOffsetX(), r + getOffsetY(), r, Path.Direction.CW); |
| return mPath; |
| } |
| |
| // It is the callers responsibility to save and restore the canvas layers. |
| void clipCanvasHardware(Canvas canvas) { |
| mPaint.setColor(Color.BLACK); |
| mPaint.setStyle(Paint.Style.FILL); |
| mPaint.setXfermode(mClipPorterDuffXfermode); |
| |
| float radius = getScaledRadius(); |
| mShaderMatrix.setScale(radius, radius); |
| mShaderMatrix.postTranslate(radius + getOffsetX(), radius + getOffsetY()); |
| mClipShader.setLocalMatrix(mShaderMatrix); |
| mPaint.setShader(mClipShader); |
| canvas.drawPaint(mPaint); |
| mPaint.setXfermode(null); |
| mPaint.setShader(null); |
| } |
| |
| private void delegateDrawing(CellLayout delegate, int cellX, int cellY) { |
| if (mDrawingDelegate != delegate) { |
| delegate.addFolderBackground(this); |
| } |
| |
| mDrawingDelegate = delegate; |
| delegateCellX = cellX; |
| delegateCellY = cellY; |
| |
| invalidate(); |
| } |
| |
| private void clearDrawingDelegate() { |
| if (mDrawingDelegate != null) { |
| mDrawingDelegate.removeFolderBackground(this); |
| } |
| |
| mDrawingDelegate = null; |
| isClipping = true; |
| invalidate(); |
| } |
| |
| boolean drawingDelegated() { |
| return mDrawingDelegate != null; |
| } |
| |
| private void animateScale(float finalScale, float finalMultiplier, |
| final Runnable onStart, final Runnable onEnd) { |
| final float scale0 = mScale; |
| final float scale1 = finalScale; |
| |
| final float bgMultiplier0 = mColorMultiplier; |
| final float bgMultiplier1 = finalMultiplier; |
| |
| if (mScaleAnimator != null) { |
| mScaleAnimator.cancel(); |
| } |
| |
| mScaleAnimator = ValueAnimator.ofFloat(0f, 1.0f); |
| |
| mScaleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| float prog = animation.getAnimatedFraction(); |
| mScale = prog * scale1 + (1 - prog) * scale0; |
| mColorMultiplier = prog * bgMultiplier1 + (1 - prog) * bgMultiplier0; |
| invalidate(); |
| } |
| }); |
| mScaleAnimator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationStart(Animator animation) { |
| if (onStart != null) { |
| onStart.run(); |
| } |
| } |
| |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (onEnd != null) { |
| onEnd.run(); |
| } |
| mScaleAnimator = null; |
| } |
| }); |
| |
| mScaleAnimator.setDuration(CONSUMPTION_ANIMATION_DURATION); |
| mScaleAnimator.start(); |
| } |
| |
| public void animateToAccept(CellLayout cl, int cellX, int cellY) { |
| animateScale(ACCEPT_SCALE_FACTOR, ACCEPT_COLOR_MULTIPLIER, |
| () -> delegateDrawing(cl, cellX, cellY), null); |
| } |
| |
| public void animateToRest() { |
| // This can be called multiple times -- we need to make sure the drawing delegate |
| // is saved and restored at the beginning of the animation, since cancelling the |
| // existing animation can clear the delgate. |
| CellLayout cl = mDrawingDelegate; |
| int cellX = delegateCellX; |
| int cellY = delegateCellY; |
| animateScale(1f, 1f, () -> delegateDrawing(cl, cellX, cellY), this::clearDrawingDelegate); |
| } |
| |
| public int getBackgroundAlpha() { |
| return (int) Math.min(MAX_BG_OPACITY, BG_OPACITY * mColorMultiplier); |
| } |
| |
| public float getStrokeWidth() { |
| return mStrokeWidth; |
| } |
| } |