1 files changed, 111 insertions, 0 deletions
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
new file mode 100644
index 000000000..b49b56568
--- /dev/null
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -0,0 +1,111 @@
+/*
+ * 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.views;
+
+import static android.support.v4.graphics.ColorUtils.compositeColors;
+import static android.support.v4.graphics.ColorUtils.setAlphaComponent;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.android.launcher3.Insettable;
+import com.android.launcher3.R;
+import com.android.launcher3.uioverrides.WallpaperColorInfo;
+import com.android.launcher3.uioverrides.WallpaperColorInfo.OnChangeListener;
+import com.android.launcher3.util.Themes;
+
+/**
+ * Simple scrim which draws a flat color
+ */
+public class ScrimView extends View implements Insettable, OnChangeListener {
+
+    private final WallpaperColorInfo mWallpaperColorInfo;
+    protected final int mEndScrim;
+
+    protected float mMaxScrimAlpha;
+
+    protected float mProgress = 1;
+    protected int mScrimColor;
+
+    protected int mCurrentFlatColor;
+    protected int mEndFlatColor;
+    protected int mEndFlatColorAlpha;
+
+    public ScrimView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mWallpaperColorInfo = WallpaperColorInfo.getInstance(context);
+        mEndScrim = Themes.getAttrColor(context, R.attr.allAppsScrimColor);
+
+        mMaxScrimAlpha = 0.7f;
+    }
+
+    @Override
+    public void setInsets(Rect insets) { }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        mWallpaperColorInfo.addOnChangeListener(this);
+        onExtractedColorsChanged(mWallpaperColorInfo);
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mWallpaperColorInfo.removeOnChangeListener(this);
+    }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
+
+    @Override
+    public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) {
+        mScrimColor = wallpaperColorInfo.getMainColor();
+        mEndFlatColor = compositeColors(mEndScrim, setAlphaComponent(
+                mScrimColor, Math.round(mMaxScrimAlpha * 255)));
+        mEndFlatColorAlpha = Color.alpha(mEndFlatColor);
+        updateColors();
+        invalidate();
+    }
+
+    public void setProgress(float progress) {
+        if (mProgress != progress) {
+            mProgress = progress;
+            updateColors();
+            invalidate();
+        }
+    }
+
+    public void reInitUi() { }
+
+    protected void updateColors() {
+        mCurrentFlatColor = mProgress >= 1 ? 0 : setAlphaComponent(
+                mEndFlatColor, Math.round((1 - mProgress) * mEndFlatColorAlpha));
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mCurrentFlatColor != 0) {
+            canvas.drawColor(mCurrentFlatColor);
+        }
+    }
+}