summaryrefslogtreecommitdiffstats
path: root/src/com/android/launcher3/graphics/WorkspaceAndHotseatScrim.java
blob: 15ff207bd1c5c18c38fbca7950860497d0f889de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
/*
 * 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.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.Region;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.Property;
import android.view.View;

import androidx.core.graphics.ColorUtils;

import com.android.launcher3.CellLayout;
import com.android.launcher3.R;
import com.android.launcher3.ResourceUtils;
import com.android.launcher3.Workspace;
import com.android.launcher3.uioverrides.WallpaperColorInfo;
import com.android.launcher3.util.Themes;

/**
 * View scrim which draws behind hotseat and workspace
 */
public class WorkspaceAndHotseatScrim extends Scrim {

    public static Property<WorkspaceAndHotseatScrim, Float> SYSUI_PROGRESS =
            new Property<WorkspaceAndHotseatScrim, Float>(Float.TYPE, "sysUiProgress") {
                @Override
                public Float get(WorkspaceAndHotseatScrim scrim) {
                    return scrim.mSysUiProgress;
                }

                @Override
                public void set(WorkspaceAndHotseatScrim scrim, Float value) {
                    scrim.setSysUiProgress(value);
                }
            };

    private static Property<WorkspaceAndHotseatScrim, Float> SYSUI_ANIM_MULTIPLIER =
            new Property<WorkspaceAndHotseatScrim, Float>(Float.TYPE, "sysUiAnimMultiplier") {
                @Override
                public Float get(WorkspaceAndHotseatScrim scrim) {
                    return scrim.mSysUiAnimMultiplier;
                }

                @Override
                public void set(WorkspaceAndHotseatScrim scrim, Float value) {
                    scrim.mSysUiAnimMultiplier = value;
                    scrim.reapplySysUiAlpha();
                }
            };

    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 DARK_SCRIM_COLOR = 0x55000000;
    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 final Rect mHighlightRect = new Rect();

    private Workspace mWorkspace;

    private boolean mDrawTopScrim, mDrawBottomScrim;

    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 Drawable mTopScrim;

    private float mSysUiProgress = 1;
    private boolean mHideSysUiScrim;

    private boolean mAnimateScrimOnNextDraw = false;
    private float mSysUiAnimMultiplier = 1;

    public WorkspaceAndHotseatScrim(View view) {
        super(view);

        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;

        onExtractedColorsChanged(mWallpaperColorInfo);
    }

    public void setWorkspace(Workspace workspace)  {
        mWorkspace = workspace;
    }

    public void draw(Canvas canvas) {
        // Draw the background below children.
        if (mScrimAlpha > 0) {
            // Update the scroll position first to ensure scrim cutout is in the right place.
            mWorkspace.computeScrollWithoutInvalidation();
            CellLayout currCellLayout = mWorkspace.getCurrentDragOverlappingLayout();
            canvas.save();
            if (currCellLayout != null && currCellLayout != mLauncher.getHotseat()) {
                // Cut a hole in the darkening scrim on the page that should be highlighted, if any.
                mLauncher.getDragLayer()
                        .getDescendantRectRelativeToSelf(currCellLayout, mHighlightRect);
                canvas.clipRect(mHighlightRect, Region.Op.DIFFERENCE);
            }

            super.draw(canvas);
            canvas.restore();
        }

        if (!mHideSysUiScrim) {
            if (mSysUiProgress <= 0) {
                mAnimateScrimOnNextDraw = false;
                return;
            }

            if (mAnimateScrimOnNextDraw) {
                mSysUiAnimMultiplier = 0;
                reapplySysUiAlphaNoInvalidate();

                animateToSysuiMultiplier(1, 600,
                        mLauncher.getWindow().getTransitionBackgroundFadeDuration());
                mAnimateScrimOnNextDraw = false;
            }

            if (mDrawTopScrim) {
                mTopScrim.draw(canvas);
            }
            if (mDrawBottomScrim) {
                canvas.drawBitmap(mBottomMask, null, mFinalMaskRect, mBottomMaskPaint);
            }
        }
    }

    public void animateToSysuiMultiplier(float toMultiplier, long duration,
            long startDelay) {
        ObjectAnimator anim = ObjectAnimator.ofFloat(this, SYSUI_ANIM_MULTIPLIER, toMultiplier);
        anim.setAutoCancel(true);
        anim.setDuration(duration);
        anim.setStartDelay(startDelay);
        anim.start();
    }

    /**
     * Determines whether to draw the top and/or bottom scrim based on new insets.
     */
    public void onInsetsChanged(Rect insets, boolean allowSysuiScrims) {
        mDrawTopScrim = allowSysuiScrims && mTopScrim != null && insets.top > 0;
        mDrawBottomScrim = allowSysuiScrims && mBottomMask != null
                && !mLauncher.getDeviceProfile().isVerticalBarLayout();
    }

    @Override
    public void onViewAttachedToWindow(View view) {
        super.onViewAttachedToWindow(view);

        if (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) {
        super.onViewDetachedFromWindow(view);
        if (mTopScrim != null) {
            mRoot.getContext().unregisterReceiver(mReceiver);
        }
    }

    @Override
    public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) {
        // for super light wallpaper it needs to be darken for contrast to workspace
        // for dark wallpapers the text is white so darkening works as well
        mBottomMaskPaint.setColor(ColorUtils.compositeColors(DARK_SCRIM_COLOR,
                wallpaperColorInfo.getMainColor()));
        reapplySysUiAlpha();
        super.onExtractedColorsChanged(wallpaperColorInfo);
    }

    public void setSize(int w, int h) {
        if (mTopScrim != null) {
            mTopScrim.setBounds(0, 0, w, h);
            mFinalMaskRect.set(0, h - mMaskHeight, w, h);
        }
    }

    public void hideSysUiScrim(boolean hideSysUiScrim) {
        mHideSysUiScrim = hideSysUiScrim || (mTopScrim == null);
        if (!hideSysUiScrim) {
            mAnimateScrimOnNextDraw = true;
        }
        invalidate();
    }

    private void setSysUiProgress(float progress) {
        if (progress != mSysUiProgress) {
            mSysUiProgress = progress;
            reapplySysUiAlpha();
        }
    }

    private void reapplySysUiAlpha() {
        reapplySysUiAlphaNoInvalidate();
        if (!mHideSysUiScrim) {
            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));
        }
    }

    public Bitmap createDitheredAlphaMask() {
        DisplayMetrics dm = mLauncher.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;
    }
}