src/com/android/launcher3/graphics/SysUiScrim.java - platform/packages/apps/Launcher3 - Git at Google

 /*
  * 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 android.content.Intent.ACTION_SCREEN_OFF;
 import static android.content.Intent.ACTION_USER_PRESENT;

 import static com.android.launcher3.config.FeatureFlags.KEYGUARD_ANIMATION;
 import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;

 import android.animation.ObjectAnimator;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 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 android.view.WindowInsets;

 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.R;
 import com.android.launcher3.ResourceUtils;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.DynamicResource;
 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 BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             final String action = intent.getAction();
             if (ACTION_SCREEN_OFF.equals(action)) {
                 mAnimateScrimOnNextDraw = true;
             } else if (ACTION_USER_PRESENT.equals(action)) {
                 // 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);
         mBottomMask = mTopScrim == null ? null : createDitheredAlphaMask();
         mHideSysUiScrim = mTopScrim == null;

         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.
      */
     public void onInsetsChanged(Rect insets) {
         mDrawTopScrim = mTopScrim != null && insets.top > 0;
         mDrawBottomScrim = mBottomMask != null
                 && !mActivity.getDeviceProfile().isVerticalBarLayout()
                 && hasBottomNavButtons();
     }

     private boolean hasBottomNavButtons() {
         if (Utilities.ATLEAST_Q && mActivity.getRootView() != null
                 && mActivity.getRootView().getRootWindowInsets() != null) {
             WindowInsets windowInsets = mActivity.getRootView().getRootWindowInsets();
             return windowInsets.getTappableElementInsets().bottom > 0;
         }
         return true;
     }

     @Override
     public void onViewAttachedToWindow(View view) {
         if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
             IntentFilter filter = new IntentFilter(ACTION_SCREEN_OFF);
             filter.addAction(ACTION_USER_PRESENT); // When the device wakes up + keyguard is gone
             mRoot.getContext().registerReceiver(mReceiver, filter);
         }
     }

     @Override
     public void onViewDetachedFromWindow(View view) {
         if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
             mRoot.getContext().unregisterReceiver(mReceiver);
         }
     }

     /**
      * 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;
     }
 }
	/*
	* 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 android.content.Intent.ACTION_SCREEN_OFF;
	import static android.content.Intent.ACTION_USER_PRESENT;

	import static com.android.launcher3.config.FeatureFlags.KEYGUARD_ANIMATION;
	import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound;

	import android.animation.ObjectAnimator;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	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 android.view.WindowInsets;

	import com.android.launcher3.BaseDraggingActivity;
	import com.android.launcher3.R;
	import com.android.launcher3.ResourceUtils;
	import com.android.launcher3.Utilities;
	import com.android.launcher3.config.FeatureFlags;
	import com.android.launcher3.util.DynamicResource;
	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 BroadcastReceiver mReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	final String action = intent.getAction();
	if (ACTION_SCREEN_OFF.equals(action)) {
	mAnimateScrimOnNextDraw = true;
	} else if (ACTION_USER_PRESENT.equals(action)) {
	// 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);
	mBottomMask = mTopScrim == null ? null : createDitheredAlphaMask();
	mHideSysUiScrim = mTopScrim == null;

	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.
	*/
	public void onInsetsChanged(Rect insets) {
	mDrawTopScrim = mTopScrim != null && insets.top > 0;
	mDrawBottomScrim = mBottomMask != null
	&& !mActivity.getDeviceProfile().isVerticalBarLayout()
	&& hasBottomNavButtons();
	}

	private boolean hasBottomNavButtons() {
	if (Utilities.ATLEAST_Q && mActivity.getRootView() != null
	&& mActivity.getRootView().getRootWindowInsets() != null) {
	WindowInsets windowInsets = mActivity.getRootView().getRootWindowInsets();
	return windowInsets.getTappableElementInsets().bottom > 0;
	}
	return true;
	}

	@Override
	public void onViewAttachedToWindow(View view) {
	if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
	IntentFilter filter = new IntentFilter(ACTION_SCREEN_OFF);
	filter.addAction(ACTION_USER_PRESENT); // When the device wakes up + keyguard is gone
	mRoot.getContext().registerReceiver(mReceiver, filter);
	}
	}

	@Override
	public void onViewDetachedFromWindow(View view) {
	if (!KEYGUARD_ANIMATION.get() && mTopScrim != null) {
	mRoot.getContext().unregisterReceiver(mReceiver);
	}
	}

	/**
	* 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;
	}
	}