sdk/sources/android-23/android/support/v7/widget/RoundRectDrawable.java

   1 /*
   2  * Copyright (C) 2014 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 package android.support.v7.widget;
  17
  18 import android.graphics.Canvas;
  19 import android.graphics.ColorFilter;
  20 import android.graphics.Outline;
  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 import static android.support.v7.widget.RoundRectDrawableWithShadow.calculateVerticalPadding;
  28 import static android.support.v7.widget.RoundRectDrawableWithShadow.calculateHorizontalPadding;
  29
  30 /**
  31  * Very simple drawable that draws a rounded rectangle background with arbitrary corners and also
  32  * reports proper outline for L.
  33  * <p>
  34  * Simpler and uses less resources compared to GradientDrawable or ShapeDrawable.
  35  */
  36 class RoundRectDrawable extends Drawable {
  37     private float mRadius;
  38     private final Paint mPaint;
  39     private final RectF mBoundsF;
  40     private final Rect mBoundsI;
  41     private float mPadding;
  42     private boolean mInsetForPadding = false;
  43     private boolean mInsetForRadius = true;
  44
  45     public RoundRectDrawable(int backgroundColor, float radius) {
  46         mRadius = radius;
  47         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
  48         mPaint.setColor(backgroundColor);
  49         mBoundsF = new RectF();
  50         mBoundsI = new Rect();
  51     }
  52
  53     void setPadding(float padding, boolean insetForPadding, boolean insetForRadius) {
  54         if (padding == mPadding && mInsetForPadding == insetForPadding &&
  55                 mInsetForRadius == insetForRadius) {
  56             return;
  57         }
  58         mPadding = padding;
  59         mInsetForPadding = insetForPadding;
  60         mInsetForRadius = insetForRadius;
  61         updateBounds(null);
  62         invalidateSelf();
  63     }
  64
  65     float getPadding() {
  66         return mPadding;
  67     }
  68
  69     @Override
  70     public void draw(Canvas canvas) {
  71         canvas.drawRoundRect(mBoundsF, mRadius, mRadius, mPaint);
  72     }
  73
  74     private void updateBounds(Rect bounds) {
  75         if (bounds == null) {
  76             bounds = getBounds();
  77         }
  78         mBoundsF.set(bounds.left, bounds.top, bounds.right, bounds.bottom);
  79         mBoundsI.set(bounds);
  80         if (mInsetForPadding) {
  81             float vInset = calculateVerticalPadding(mPadding, mRadius, mInsetForRadius);
  82             float hInset = calculateHorizontalPadding(mPadding, mRadius, mInsetForRadius);
  83             mBoundsI.inset((int) Math.ceil(hInset), (int) Math.ceil(vInset));
  84             // to make sure they have same bounds.
  85             mBoundsF.set(mBoundsI);
  86         }
  87     }
  88
  89     @Override
  90     protected void onBoundsChange(Rect bounds) {
  91         super.onBoundsChange(bounds);
  92         updateBounds(bounds);
  93     }
  94
  95     @Override
  96     public void getOutline(Outline outline) {
  97         outline.setRoundRect(mBoundsI, mRadius);
  98     }
  99
 100     void setRadius(float radius) {
 101         if (radius == mRadius) {
 102             return;
 103         }
 104         mRadius = radius;
 105         updateBounds(null);
 106         invalidateSelf();
 107     }
 108
 109     @Override
 110     public void setAlpha(int alpha) {
 111         // not supported because older versions do not support
 112     }
 113
 114     @Override
 115     public void setColorFilter(ColorFilter cf) {
 116         // not supported because older versions do not support
 117     }
 118
 119     @Override
 120     public int getOpacity() {
 121         return PixelFormat.TRANSLUCENT;
 122     }
 123
 124     public float getRadius() {
 125         return mRadius;
 126     }
 127
 128     public void setColor(int color) {
 129         mPaint.setColor(color);
 130         invalidateSelf();
 131     }
 132 }