1 package com.android.launcher3.graphics; 2 3 import android.annotation.TargetApi; 4 import android.content.res.Resources; 5 import android.content.res.Resources.Theme; 6 import android.graphics.Canvas; 7 import android.graphics.drawable.ColorDrawable; 8 import android.graphics.drawable.DrawableWrapper; 9 import android.os.Build; 10 import android.util.AttributeSet; 11 12 import org.xmlpull.v1.XmlPullParser; 13 14 /** 15 * Extension of {@link DrawableWrapper} which scales the child drawables by a fixed amount. 16 */ 17 @TargetApi(Build.VERSION_CODES.N) 18 public class FixedScaleDrawable extends DrawableWrapper { 19 20 // TODO b/33553066 use the constant defined in MaskableIconDrawable 21 private static final float LEGACY_ICON_SCALE = .7f * .6667f; 22 private float mScaleX, mScaleY; 23 FixedScaleDrawable()24 public FixedScaleDrawable() { 25 super(new ColorDrawable()); 26 mScaleX = LEGACY_ICON_SCALE; 27 mScaleY = LEGACY_ICON_SCALE; 28 } 29 30 @Override draw(Canvas canvas)31 public void draw(Canvas canvas) { 32 int saveCount = canvas.save(Canvas.MATRIX_SAVE_FLAG); 33 canvas.scale(mScaleX, mScaleY, 34 getBounds().exactCenterX(), getBounds().exactCenterY()); 35 super.draw(canvas); 36 canvas.restoreToCount(saveCount); 37 } 38 39 @Override inflate(Resources r, XmlPullParser parser, AttributeSet attrs)40 public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs) { } 41 42 @Override inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme)43 public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme) { } 44 setScale(float scale)45 public void setScale(float scale) { 46 float h = getIntrinsicHeight(); 47 float w = getIntrinsicWidth(); 48 mScaleX = scale * LEGACY_ICON_SCALE; 49 mScaleY = scale * LEGACY_ICON_SCALE; 50 if (h > w && w > 0) { 51 mScaleX *= w / h; 52 } else if (w > h && h > 0) { 53 mScaleY *= h / w; 54 } 55 } 56 } 57