Move BadgeRenderer to iconloader library

- Rename BadgeRenderer to DotRenderer
- Move drawing parameters to new class DrawParams
- Add leftAlign param
Change-Id: I69de56c13280ba5e7e1ea3868c23edfac01012e9

1 files changed, 112 insertions, 0 deletions

diff --git a/iconloaderlib/src/com/android/launcher3/icons/DotRenderer.java b/iconloaderlib/src/com/android/launcher3/icons/DotRenderer.java
new file mode 100644
index 000000000..6bc859aa6
--- /dev/null
+++ b/iconloaderlib/src/com/android/launcher3/icons/DotRenderer.java
@@ -0,0 +1,112 @@
+/*
+ * 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.icons;
+
+import static android.graphics.Paint.ANTI_ALIAS_FLAG;
+import static android.graphics.Paint.FILTER_BITMAP_FLAG;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.util.Log;
+import android.view.ViewDebug;
+
+/**
+ * Used to draw a notification dot on top of an icon.
+ */
+public class DotRenderer {
+
+    private static final String TAG = "DotRenderer";
+
+    // The dot size is defined as a percentage of the app icon size.
+    private static final float SIZE_PERCENTAGE = 0.38f;
+
+    // Extra scale down of the dot
+    private static final float DOT_SCALE = 0.6f;
+
+    // Offset the dot slightly away from the icon if there's space.
+    private static final float OFFSET_PERCENTAGE = 0.02f;
+
+    private final float mDotCenterOffset;
+    private final int mOffset;
+    private final float mCircleRadius;
+    private final Paint mCirclePaint = new Paint(ANTI_ALIAS_FLAG | FILTER_BITMAP_FLAG);
+
+    private final Bitmap mBackgroundWithShadow;
+    private final float mBitmapOffset;
+
+    public DotRenderer(int iconSizePx) {
+        mDotCenterOffset = SIZE_PERCENTAGE * iconSizePx;
+        mOffset = (int) (OFFSET_PERCENTAGE * iconSizePx);
+
+        int size = (int) (DOT_SCALE * mDotCenterOffset);
+        ShadowGenerator.Builder builder = new ShadowGenerator.Builder(Color.TRANSPARENT);
+        builder.ambientShadowAlpha = 88;
+        mBackgroundWithShadow = builder.setupBlurForSize(size).createPill(size, size);
+        mCircleRadius = builder.radius;
+
+        mBitmapOffset = -mBackgroundWithShadow.getHeight() * 0.5f; // Same as width.
+    }
+
+    /**
+     * Draw a circle on top of the canvas according to the given params.
+     */
+    public void draw(Canvas canvas, DrawParams params) {
+        if (params == null) {
+            Log.e(TAG, "Invalid null argument(s) passed in call to draw.");
+            return;
+        }
+        canvas.save();
+        // We draw the dot relative to its center.
+        float dotCenterX = params.leftAlign
+                ? params.iconBounds.left + mDotCenterOffset / 2
+                : params.iconBounds.right - mDotCenterOffset / 2;
+        float dotCenterY = params.iconBounds.top + mDotCenterOffset / 2;
+
+        int offsetX = Math.min(mOffset, params.spaceForOffset.x);
+        int offsetY = Math.min(mOffset, params.spaceForOffset.y);
+        canvas.translate(dotCenterX + offsetX, dotCenterY - offsetY);
+        canvas.scale(params.scale, params.scale);
+
+        mCirclePaint.setColor(Color.BLACK);
+        canvas.drawBitmap(mBackgroundWithShadow, mBitmapOffset, mBitmapOffset, mCirclePaint);
+        mCirclePaint.setColor(params.color);
+        canvas.drawCircle(0, 0, mCircleRadius, mCirclePaint);
+        canvas.restore();
+    }
+
+    public static class DrawParams {
+        /** The color (possibly based on the icon) to use for the dot. */
+        @ViewDebug.ExportedProperty(category = "notification dot", formatToHexString = true)
+        public int color;
+        /** The bounds of the icon that the dot is drawn on top of. */
+        @ViewDebug.ExportedProperty(category = "notification dot")
+        public Rect iconBounds = new Rect();
+        /** The progress of the animation, from 0 to 1. */
+        @ViewDebug.ExportedProperty(category = "notification dot")
+        public float scale;
+        /** Overrides internally calculated offset if specified value is smaller. */
+        @ViewDebug.ExportedProperty(category = "notification dot")
+        public Point spaceForOffset = new Point();
+        /** Whether the dot should align to the top left of the icon rather than the top right. */
+        @ViewDebug.ExportedProperty(category = "notification dot")
+        public boolean leftAlign;
+    }
+}