1 files changed, 97 insertions, 0 deletions
diff --git a/src/com/android/launcher3/graphics/Scrim.java b/src/com/android/launcher3/graphics/Scrim.java
new file mode 100644
index 000000000..5c14f8d20
--- /dev/null
+++ b/src/com/android/launcher3/graphics/Scrim.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2019 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.icons.GraphicsUtils.setColorAlphaBound;
+
+import android.graphics.Canvas;
+import android.util.Property;
+import android.view.View;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.uioverrides.WallpaperColorInfo;
+
+/**
+ * Contains general scrim properties such as wallpaper-extracted color that subclasses can use.
+ */
+public class Scrim implements View.OnAttachStateChangeListener,
+        WallpaperColorInfo.OnChangeListener {
+
+    public static Property<Scrim, Float> SCRIM_PROGRESS =
+            new Property<Scrim, Float>(Float.TYPE, "scrimProgress") {
+                @Override
+                public Float get(Scrim scrim) {
+                    return scrim.mScrimProgress;
+                }
+
+                @Override
+                public void set(Scrim scrim, Float value) {
+                    scrim.setScrimProgress(value);
+                }
+            };
+
+    protected final Launcher mLauncher;
+    protected final WallpaperColorInfo mWallpaperColorInfo;
+    protected final View mRoot;
+
+    protected float mScrimProgress;
+    protected int mScrimColor;
+    protected int mScrimAlpha = 0;
+
+    public Scrim(View view) {
+        mRoot = view;
+        mLauncher = Launcher.getLauncher(view.getContext());
+        mWallpaperColorInfo = WallpaperColorInfo.getInstance(mLauncher);
+
+        view.addOnAttachStateChangeListener(this);
+    }
+
+    public void draw(Canvas canvas) {
+        canvas.drawColor(setColorAlphaBound(mScrimColor, mScrimAlpha));
+    }
+
+    private void setScrimProgress(float progress) {
+        if (mScrimProgress != progress) {
+            mScrimProgress = progress;
+            mScrimAlpha = Math.round(255 * mScrimProgress);
+            invalidate();
+        }
+    }
+
+    @Override
+    public void onViewAttachedToWindow(View view) {
+        mWallpaperColorInfo.addOnChangeListener(this);
+        onExtractedColorsChanged(mWallpaperColorInfo);
+    }
+
+    @Override
+    public void onViewDetachedFromWindow(View view) {
+        mWallpaperColorInfo.removeOnChangeListener(this);
+    }
+
+    @Override
+    public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) {
+        mScrimColor = wallpaperColorInfo.getMainColor();
+        if (mScrimAlpha > 0) {
+            invalidate();
+        }
+    }
+
+    public void invalidate() {
+        mRoot.invalidate();
+    }
+}