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/*
* 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.graphics;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Interpolator;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.Utilities;
import com.android.launcher3.dynamicui.WallpaperColorInfo;
/**
* Draws a translucent radial gradient background from an initial state with progress 0.0 to a
* final state with progress 1.0;
*/
public class GradientView extends View implements WallpaperColorInfo.OnChangeListener {
private static final int DEFAULT_COLOR = Color.WHITE;
private static final float GRADIENT_ALPHA_MASK_LENGTH_DP = 300;
private static final boolean DEBUG = false;
private final Bitmap mFinalGradientMask;
private final Bitmap mAlphaGradientMask;
private int mColor1 = DEFAULT_COLOR;
private int mColor2 = DEFAULT_COLOR;
private int mWidth;
private int mHeight;
private final RectF mAlphaMaskRect = new RectF();
private final RectF mFinalMaskRect = new RectF();
private final Paint mPaint = new Paint();
private float mProgress;
private final int mMaskHeight;
private final Context mAppContext;
private final Paint mDebugPaint = DEBUG ? new Paint() : null;
private final Interpolator mAccelerator = new AccelerateInterpolator();
private final float mAlphaStart;
private final WallpaperColorInfo mWallpaperColorInfo;
public GradientView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mAppContext = context.getApplicationContext();
this.mMaskHeight = Utilities.pxFromDp(GRADIENT_ALPHA_MASK_LENGTH_DP,
mAppContext.getResources().getDisplayMetrics());
Launcher launcher = Launcher.getLauncher(context);
this.mAlphaStart = launcher.getDeviceProfile().isVerticalBarLayout() ? 0 : 100;
this.mWallpaperColorInfo = WallpaperColorInfo.getInstance(launcher);
updateColors();
int finalAlpha = 0xBF;
mFinalGradientMask = Utilities.convertToAlphaMask(
Utilities.createOnePixBitmap(), finalAlpha);
Bitmap alphaMaskFromResource = BitmapFactory.decodeResource(context.getResources(),
R.drawable.all_apps_alpha_mask);
mAlphaGradientMask = Utilities.convertToAlphaMask(
alphaMaskFromResource, finalAlpha);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mWallpaperColorInfo.addOnChangeListener(this);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mWallpaperColorInfo.removeOnChangeListener(this);
}
@Override
public void onExtractedColorsChanged(WallpaperColorInfo info) {
updateColors();
invalidate();
}
private void updateColors() {
this.mColor1 = mWallpaperColorInfo.getMainColor();
this.mColor2 = mWallpaperColorInfo.getSecondaryColor();
if (mWidth + mHeight > 0) {
createRadialShader();
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
this.mWidth = getMeasuredWidth();
this.mHeight = getMeasuredHeight();
if (mWidth + mHeight > 0) {
createRadialShader();
}
}
// only being called when colors change
private void createRadialShader() {
final float gradientCenterY = 1.05f;
float radius = Math.max(mHeight, mWidth) * gradientCenterY;
float posScreenBottom = (radius - mHeight) / radius; // center lives below screen
RadialGradient shader = new RadialGradient(
mWidth * 0.5f,
mHeight * gradientCenterY,
radius,
new int[] {mColor1, mColor1, mColor2},
new float[] {0f, posScreenBottom, 1f},
Shader.TileMode.CLAMP);
mPaint.setShader(shader);
}
public void setProgress(float progress) {
this.mProgress = progress;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
float head = 0.29f;
float linearProgress = head + (mProgress * (1f - head));
float startMaskY = (1f - linearProgress) * mHeight - mMaskHeight * linearProgress;
float interpolatedAlpha = (255 - mAlphaStart) * mAccelerator.getInterpolation(mProgress);
mPaint.setAlpha((int) (mAlphaStart + interpolatedAlpha));
mAlphaMaskRect.set(0, startMaskY, mWidth, startMaskY + mMaskHeight);
mFinalMaskRect.set(0, startMaskY + mMaskHeight, mWidth, mHeight);
canvas.drawBitmap(mAlphaGradientMask, null, mAlphaMaskRect, mPaint);
canvas.drawBitmap(mFinalGradientMask, null, mFinalMaskRect, mPaint);
if (DEBUG) {
mDebugPaint.setColor(0xFF00FF00);
canvas.drawLine(0, startMaskY, mWidth, startMaskY, mDebugPaint);
canvas.drawLine(0, startMaskY + mMaskHeight, mWidth, startMaskY + mMaskHeight, mDebugPaint);
}
}
}
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