1 files changed, 182 insertions, 0 deletions
diff --git a/android/slice/views/SliceViewUtil.java b/android/slice/views/SliceViewUtil.java
new file mode 100644
index 00000000..1b5a6d1e
--- /dev/null
+++ b/android/slice/views/SliceViewUtil.java
@@ -0,0 +1,182 @@
+/*
+ * 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 android.slice.views;
+
+import android.annotation.ColorInt;
+import android.content.Context;
+import android.content.res.ColorStateList;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff.Mode;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.Icon;
+import android.view.Gravity;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+
+/**
+ * A bunch of utilities for slice UI.
+ *
+ * @hide
+ */
+public class SliceViewUtil {
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int getColorAccent(Context context) {
+        return getColorAttr(context, android.R.attr.colorAccent);
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int getColorError(Context context) {
+        return getColorAttr(context, android.R.attr.colorError);
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int getDefaultColor(Context context, int resId) {
+        final ColorStateList list = context.getResources().getColorStateList(resId,
+                context.getTheme());
+
+        return list.getDefaultColor();
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int getDisabled(Context context, int inputColor) {
+        return applyAlphaAttr(context, android.R.attr.disabledAlpha, inputColor);
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int applyAlphaAttr(Context context, int attr, int inputColor) {
+        TypedArray ta = context.obtainStyledAttributes(new int[] {
+                attr
+        });
+        float alpha = ta.getFloat(0, 0);
+        ta.recycle();
+        return applyAlpha(alpha, inputColor);
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int applyAlpha(float alpha, int inputColor) {
+        alpha *= Color.alpha(inputColor);
+        return Color.argb((int) (alpha), Color.red(inputColor), Color.green(inputColor),
+                Color.blue(inputColor));
+    }
+
+    /**
+     * @hide
+     */
+    @ColorInt
+    public static int getColorAttr(Context context, int attr) {
+        TypedArray ta = context.obtainStyledAttributes(new int[] {
+                attr
+        });
+        @ColorInt
+        int colorAccent = ta.getColor(0, 0);
+        ta.recycle();
+        return colorAccent;
+    }
+
+    /**
+     * @hide
+     */
+    public static int getThemeAttr(Context context, int attr) {
+        TypedArray ta = context.obtainStyledAttributes(new int[] {
+                attr
+        });
+        int theme = ta.getResourceId(0, 0);
+        ta.recycle();
+        return theme;
+    }
+
+    /**
+     * @hide
+     */
+    public static Drawable getDrawable(Context context, int attr) {
+        TypedArray ta = context.obtainStyledAttributes(new int[] {
+                attr
+        });
+        Drawable drawable = ta.getDrawable(0);
+        ta.recycle();
+        return drawable;
+    }
+
+    /**
+     * @hide
+     */
+    public static void createCircledIcon(Context context, int color, int iconSize, Icon icon,
+            boolean isLarge, ViewGroup parent) {
+        ImageView v = new ImageView(context);
+        v.setImageIcon(icon);
+        parent.addView(v);
+        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) v.getLayoutParams();
+        if (isLarge) {
+            // XXX better way to convert from icon -> bitmap or crop an icon (?)
+            Bitmap iconBm = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);
+            Canvas iconCanvas = new Canvas(iconBm);
+            v.layout(0, 0, iconSize, iconSize);
+            v.draw(iconCanvas);
+            v.setImageBitmap(getCircularBitmap(iconBm));
+        } else {
+            v.setColorFilter(Color.WHITE);
+        }
+        lp.width = iconSize;
+        lp.height = iconSize;
+        lp.gravity = Gravity.CENTER;
+    }
+
+    /**
+     * @hide
+     */
+    public static Bitmap getCircularBitmap(Bitmap bitmap) {
+        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
+                bitmap.getHeight(), Config.ARGB_8888);
+        Canvas canvas = new Canvas(output);
+        final Paint paint = new Paint();
+        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
+        paint.setAntiAlias(true);
+        canvas.drawARGB(0, 0, 0, 0);
+        canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
+                bitmap.getWidth() / 2, paint);
+        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
+        canvas.drawBitmap(bitmap, rect, rect, paint);
+        return output;
+    }
+}