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/*
* Copyright (C) 2018 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 static com.android.launcher3.config.FeatureFlags.KEYGUARD_ANIMATION;
import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;
import android.animation.ObjectAnimator;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.FloatProperty;
import android.view.View;
import com.android.launcher3.BaseDraggingActivity;
import com.android.launcher3.DeviceProfile;
import com.android.launcher3.R;
import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.testing.shared.ResourceUtils;
import com.android.launcher3.util.DynamicResource;
import com.android.launcher3.util.ScreenOnTracker;
import com.android.launcher3.util.ScreenOnTracker.ScreenOnListener;
import com.android.launcher3.util.Themes;
import com.android.systemui.plugins.ResourceProvider;
/**
* View scrim which draws behind hotseat and workspace
*/
public class SysUiScrim implements View.OnAttachStateChangeListener {
public static final FloatProperty<SysUiScrim> SYSUI_PROGRESS =
new FloatProperty<SysUiScrim>("sysUiProgress") {
@Override
public Float get(SysUiScrim scrim) {
return scrim.mSysUiProgress;
}
@Override
public void setValue(SysUiScrim scrim, float value) {
scrim.setSysUiProgress(value);
}
};
private static final FloatProperty<SysUiScrim> SYSUI_ANIM_MULTIPLIER =
new FloatProperty<SysUiScrim>("sysUiAnimMultiplier") {
@Override
public Float get(SysUiScrim scrim) {
return scrim.mSysUiAnimMultiplier;
}
@Override
public void setValue(SysUiScrim scrim, float value) {
scrim.mSysUiAnimMultiplier = value;
scrim.reapplySysUiAlpha();
}
};
/**
* Receiver used to get a signal that the user unlocked their device.
*/
private final ScreenOnListener mScreenOnListener = new ScreenOnListener() {
@Override
public void onScreenOnChanged(boolean isOn) {
if (!isOn) {
mAnimateScrimOnNextDraw = true;
}
}
@Override
public void onUserPresent() {
// ACTION_USER_PRESENT is sent after onStart/onResume. This covers the case where
// the user unlocked and the Launcher is not in the foreground.
mAnimateScrimOnNextDraw = false;
}
};
private static final int MAX_HOTSEAT_SCRIM_ALPHA = 100;
private static final int ALPHA_MASK_HEIGHT_DP = 500;
private static final int ALPHA_MASK_BITMAP_DP = 200;
private static final int ALPHA_MASK_WIDTH_DP = 2;
private boolean mDrawTopScrim, mDrawBottomScrim, mDrawWallpaperScrim;
private final RectF mWallpaperScrimRect = new RectF();
private final Paint mWallpaperScrimPaint = new Paint();
private final RectF mFinalMaskRect = new RectF();
private final Paint mBottomMaskPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
private final Bitmap mBottomMask;
private final int mMaskHeight;
private final View mRoot;
private final BaseDraggingActivity mActivity;
private final Drawable mTopScrim;
private float mSysUiProgress = 1;
private boolean mHideSysUiScrim;
private boolean mAnimateScrimOnNextDraw = false;
private float mSysUiAnimMultiplier = 1;
private int mWallpaperScrimMaxAlpha;
public SysUiScrim(View view) {
mRoot = view;
mActivity = BaseDraggingActivity.fromContext(view.getContext());
mMaskHeight = ResourceUtils.pxFromDp(ALPHA_MASK_BITMAP_DP,
view.getResources().getDisplayMetrics());
mTopScrim = Themes.getAttrDrawable(view.getContext(), R.attr.workspaceStatusBarScrim);
if (mTopScrim != null) {
mTopScrim.setDither(true);
mBottomMask = createDitheredAlphaMask();
mHideSysUiScrim = false;
} else {
mBottomMask = null;
mHideSysUiScrim = true;
}
mDrawWallpaperScrim = FeatureFlags.ENABLE_WALLPAPER_SCRIM.get()
&& !Themes.getAttrBoolean(view.getContext(), R.attr.isMainColorDark)
&& !Themes.getAttrBoolean(view.getContext(), R.attr.isWorkspaceDarkText);
ResourceProvider rp = DynamicResource.provider(view.getContext());
int wallpaperScrimColor = rp.getColor(R.color.wallpaper_scrim_color);
mWallpaperScrimMaxAlpha = Color.alpha(wallpaperScrimColor);
mWallpaperScrimPaint.setColor(wallpaperScrimColor);
view.addOnAttachStateChangeListener(this);
}
/**
* Draw the top and bottom scrims
*/
public void draw(Canvas canvas) {
if (!mHideSysUiScrim) {
if (mSysUiProgress <= 0) {
mAnimateScrimOnNextDraw = false;
return;
}
if (mAnimateScrimOnNextDraw) {
mSysUiAnimMultiplier = 0;
reapplySysUiAlphaNoInvalidate();
ObjectAnimator oa = createSysuiMultiplierAnim(1);
oa.setDuration(600);
oa.setStartDelay(mActivity.getWindow().getTransitionBackgroundFadeDuration());
oa.start();
mAnimateScrimOnNextDraw = false;
}
if (mDrawWallpaperScrim) {
canvas.drawRect(mWallpaperScrimRect, mWallpaperScrimPaint);
}
if (mDrawTopScrim) {
mTopScrim.draw(canvas);
}
if (mDrawBottomScrim) {
canvas.drawBitmap(mBottomMask, null, mFinalMaskRect, mBottomMaskPaint);
}
}
}
/**
* @return an ObjectAnimator that controls the fade in/out of the sys ui scrim.
*/
public ObjectAnimator createSysuiMultiplierAnim(float... values) {
ObjectAnimator anim = ObjectAnimator.ofFloat(this, SYSUI_ANIM_MULTIPLIER, values);
anim.setAutoCancel(true);
return anim;
}
/**
* Determines whether to draw the top and/or bottom scrim based on new insets.
*
* In order for the bottom scrim to be drawn this 3 condition should be meet at the same time:
* the device is in 3 button navigation, the taskbar is not present and the Hotseat is
* horizontal
*/
public void onInsetsChanged(Rect insets) {
DeviceProfile dp = mActivity.getDeviceProfile();
mDrawTopScrim = mTopScrim != null && insets.top > 0;
mDrawBottomScrim = mBottomMask != null
&& !dp.isVerticalBarLayout()
&& !dp.isGestureMode
&& !dp.isTaskbarPresent;
}
@Override
public void onViewAttachedToWindow(View view) {
if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
ScreenOnTracker.INSTANCE.get(mActivity).addListener(mScreenOnListener);
}
}
@Override
public void onViewDetachedFromWindow(View view) {
if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
ScreenOnTracker.INSTANCE.get(mActivity).removeListener(mScreenOnListener);
}
}
/**
* Set the width and height of the view being scrimmed
* @param w
* @param h
*/
public void setSize(int w, int h) {
if (mTopScrim != null) {
mTopScrim.setBounds(0, 0, w, h);
mFinalMaskRect.set(0, h - mMaskHeight, w, h);
}
mWallpaperScrimRect.set(0, 0, w, h);
}
private void setSysUiProgress(float progress) {
if (progress != mSysUiProgress) {
mSysUiProgress = progress;
reapplySysUiAlpha();
}
}
private void reapplySysUiAlpha() {
reapplySysUiAlphaNoInvalidate();
if (!mHideSysUiScrim) {
mRoot.invalidate();
}
}
private void reapplySysUiAlphaNoInvalidate() {
float factor = mSysUiProgress * mSysUiAnimMultiplier;
mBottomMaskPaint.setAlpha(Math.round(MAX_HOTSEAT_SCRIM_ALPHA * factor));
if (mTopScrim != null) {
mTopScrim.setAlpha(Math.round(255 * factor));
}
mWallpaperScrimPaint.setAlpha(Math.round(mWallpaperScrimMaxAlpha * factor));
}
private Bitmap createDitheredAlphaMask() {
DisplayMetrics dm = mActivity.getResources().getDisplayMetrics();
int width = ResourceUtils.pxFromDp(ALPHA_MASK_WIDTH_DP, dm);
int gradientHeight = ResourceUtils.pxFromDp(ALPHA_MASK_HEIGHT_DP, dm);
Bitmap dst = Bitmap.createBitmap(width, mMaskHeight, Bitmap.Config.ALPHA_8);
Canvas c = new Canvas(dst);
Paint paint = new Paint(Paint.DITHER_FLAG);
LinearGradient lg = new LinearGradient(0, 0, 0, gradientHeight,
new int[]{
0x00FFFFFF,
setColorAlphaBound(Color.WHITE, (int) (0xFF * 0.95)),
0xFFFFFFFF},
new float[]{0f, 0.8f, 1f},
Shader.TileMode.CLAMP);
paint.setShader(lg);
c.drawRect(0, 0, width, gradientHeight, paint);
return dst;
}
}