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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.ui;
     18 
     19 import android.graphics.Canvas;
     20 import android.graphics.ColorFilter;
     21 import android.graphics.Paint;
     22 import android.graphics.PixelFormat;
     23 import android.graphics.Rect;
     24 import android.graphics.RectF;
     25 import android.graphics.drawable.Drawable;
     26 
     27 /**
     28  * Drawable that takes a {@link RectF} as a screen, and draws around that
     29  * screen to fill margins between the screen and the edge of the {@link Canvas}
     30  * when drawing.
     31  */
     32 public class MarginDrawable extends Drawable {
     33 
     34     private RectF mScreen = new RectF(0, 0, 0, 0);
     35     private final Paint mPaint;
     36 
     37     public MarginDrawable(int color) {
     38         super();
     39 
     40         mPaint = new Paint();
     41         mPaint.setAntiAlias(true);
     42         mPaint.setColor(color);
     43     }
     44 
     45     /**
     46      * Set the screen around which will be drawn margins. If the screen rect
     47      * has no area (zero width or height), no margins will be drawn.
     48      *
     49      * @param screen A {@link RectF} describing the screen dimensions
     50      */
     51     public void setScreen(RectF screen) {
     52         mScreen.set(screen);
     53         invalidateSelf();
     54     }
     55 
     56     @Override
     57     public void draw(Canvas canvas) {
     58         RectF s = mScreen;
     59         if (s.top < s.bottom && s.left < s.right) {
     60             Rect cb = canvas.getClipBounds();
     61             if (s.top > 0) {
     62                 canvas.drawRect(0, 0, cb.right, s.top + 1, mPaint);
     63             }
     64             if (s.left > 0) {
     65                 canvas.drawRect(0, s.top, s.left + 1, s.bottom, mPaint);
     66             }
     67             if (s.right < cb.right) {
     68                 canvas.drawRect(s.right - 1, s.top, cb.right, s.bottom, mPaint);
     69             }
     70             if (s.bottom < cb.bottom) {
     71                 canvas.drawRect(0, s.bottom - 1, cb.right, cb.bottom, mPaint);
     72             }
     73         }
     74     }
     75 
     76     @Override
     77     public void setAlpha(int alpha) {
     78     }
     79 
     80     @Override
     81     public void setColorFilter(ColorFilter cf) {
     82     }
     83 
     84     @Override
     85     public int getOpacity() {
     86         return PixelFormat.OPAQUE;
     87     }
     88 }
     89