Updating the fast scroll bar UI

Bug: 37015359
Change-Id: Iec0748f04ebe9a3eef13ff759da3cab6ff28c3a1

1 files changed, 89 insertions, 0 deletions

diff --git a/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java b/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java
new file mode 100644
index 000000000..6ebc74eeb
--- /dev/null
+++ b/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 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 android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Matrix;
+import android.graphics.Outline;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+public class FastScrollThumbDrawable extends Drawable {
+
+    private static final Matrix sMatrix = new Matrix();
+
+    private final Path mPath = new Path();
+    private final Paint mPaint;
+    private final boolean mIsRtl;
+
+    public FastScrollThumbDrawable(Paint paint, boolean isRtl) {
+        mPaint = paint;
+        mIsRtl = isRtl;
+    }
+
+    @Override
+    public void getOutline(Outline outline) {
+        if (mPath.isConvex()) {
+            outline.setConvexPath(mPath);
+        }
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        mPath.reset();
+
+        float r = bounds.height()  * 0.5f;
+        // The path represents a rotate tear-drop shape, with radius of one corner is 1/5th of the
+        // other 3 corners.
+        float diameter = 2 * r;
+        float r2 = r / 5;
+        mPath.addRoundRect(bounds.left, bounds.top, bounds.left + diameter, bounds.top + diameter,
+                new float[] {r, r, r, r, r2, r2, r, r},
+                Path.Direction.CCW);
+
+        sMatrix.setRotate(-45, bounds.left + r, bounds.top + r);
+        if (mIsRtl) {
+            sMatrix.postTranslate(bounds.width(), 0);
+            sMatrix.postScale(-1, 1, bounds.width(), 0);
+        }
+        mPath.transform(sMatrix);
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        canvas.drawPath(mPath, mPaint);
+    }
+
+    @Override
+    public void setAlpha(int i) {
+        // Not supported
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        // Not supported
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+}