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Utilities.java revision c9070ebd13263a341511cf779087a46750021196 
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
17package com.android.systemui.recents.misc;
18
19import android.animation.Animator;
20import android.graphics.Color;
21import android.graphics.Matrix;
22import android.graphics.Rect;
23import android.view.View;
24
25import java.lang.reflect.InvocationTargetException;
26import java.lang.reflect.Method;
27import java.util.ArrayList;
28
29/* Common code */
30public class Utilities {
31
32    // Reflection methods for altering shadows
33    private static Method sPropertyMethod;
34    static {
35        try {
36            Class<?> c = Class.forName("android.view.DisplayListCanvas");
37            sPropertyMethod = c.getDeclaredMethod("setProperty", String.class, String.class);
38            if (!sPropertyMethod.isAccessible()) sPropertyMethod.setAccessible(true);
39        } catch (ClassNotFoundException e) {
40            e.printStackTrace();
41        } catch (NoSuchMethodException e) {
42            e.printStackTrace();
43        }
44    }
45
46    /** Scales a rect about its centroid */
47    public static void scaleRectAboutCenter(Rect r, float scale) {
48        if (scale != 1.0f) {
49            int cx = r.centerX();
50            int cy = r.centerY();
51            r.offset(-cx, -cy);
52            r.left = (int) (r.left * scale + 0.5f);
53            r.top = (int) (r.top * scale + 0.5f);
54            r.right = (int) (r.right * scale + 0.5f);
55            r.bottom = (int) (r.bottom * scale + 0.5f);
56            r.offset(cx, cy);
57        }
58    }
59
60    /** Maps a coorindate in a descendant view into the parent. */
61    public static float mapCoordInDescendentToSelf(View descendant, View root,
62            float[] coord, boolean includeRootScroll) {
63        ArrayList<View> ancestorChain = new ArrayList<View>();
64
65        float[] pt = {coord[0], coord[1]};
66
67        View v = descendant;
68        while(v != root && v != null) {
69            ancestorChain.add(v);
70            v = (View) v.getParent();
71        }
72        ancestorChain.add(root);
73
74        float scale = 1.0f;
75        int count = ancestorChain.size();
76        for (int i = 0; i < count; i++) {
77            View v0 = ancestorChain.get(i);
78            // For TextViews, scroll has a meaning which relates to the text position
79            // which is very strange... ignore the scroll.
80            if (v0 != descendant || includeRootScroll) {
81                pt[0] -= v0.getScrollX();
82                pt[1] -= v0.getScrollY();
83            }
84
85            v0.getMatrix().mapPoints(pt);
86            pt[0] += v0.getLeft();
87            pt[1] += v0.getTop();
88            scale *= v0.getScaleX();
89        }
90
91        coord[0] = pt[0];
92        coord[1] = pt[1];
93        return scale;
94    }
95
96    /** Maps a coordinate in the root to a descendent. */
97    public static float mapCoordInSelfToDescendent(View descendant, View root,
98            float[] coord, Matrix tmpInverseMatrix) {
99        ArrayList<View> ancestorChain = new ArrayList<View>();
100
101        float[] pt = {coord[0], coord[1]};
102
103        View v = descendant;
104        while(v != root) {
105            ancestorChain.add(v);
106            v = (View) v.getParent();
107        }
108        ancestorChain.add(root);
109
110        float scale = 1.0f;
111        int count = ancestorChain.size();
112        tmpInverseMatrix.set(Matrix.IDENTITY_MATRIX);
113        for (int i = count - 1; i >= 0; i--) {
114            View ancestor = ancestorChain.get(i);
115            View next = i > 0 ? ancestorChain.get(i-1) : null;
116
117            pt[0] += ancestor.getScrollX();
118            pt[1] += ancestor.getScrollY();
119
120            if (next != null) {
121                pt[0] -= next.getLeft();
122                pt[1] -= next.getTop();
123                next.getMatrix().invert(tmpInverseMatrix);
124                tmpInverseMatrix.mapPoints(pt);
125                scale *= next.getScaleX();
126            }
127        }
128
129        coord[0] = pt[0];
130        coord[1] = pt[1];
131        return scale;
132    }
133
134    /** Calculates the constrast between two colors, using the algorithm provided by the WCAG v2. */
135    public static float computeContrastBetweenColors(int bg, int fg) {
136        float bgR = Color.red(bg) / 255f;
137        float bgG = Color.green(bg) / 255f;
138        float bgB = Color.blue(bg) / 255f;
139        bgR = (bgR < 0.03928f) ? bgR / 12.92f : (float) Math.pow((bgR + 0.055f) / 1.055f, 2.4f);
140        bgG = (bgG < 0.03928f) ? bgG / 12.92f : (float) Math.pow((bgG + 0.055f) / 1.055f, 2.4f);
141        bgB = (bgB < 0.03928f) ? bgB / 12.92f : (float) Math.pow((bgB + 0.055f) / 1.055f, 2.4f);
142        float bgL = 0.2126f * bgR + 0.7152f * bgG + 0.0722f * bgB;
143
144        float fgR = Color.red(fg) / 255f;
145        float fgG = Color.green(fg) / 255f;
146        float fgB = Color.blue(fg) / 255f;
147        fgR = (fgR < 0.03928f) ? fgR / 12.92f : (float) Math.pow((fgR + 0.055f) / 1.055f, 2.4f);
148        fgG = (fgG < 0.03928f) ? fgG / 12.92f : (float) Math.pow((fgG + 0.055f) / 1.055f, 2.4f);
149        fgB = (fgB < 0.03928f) ? fgB / 12.92f : (float) Math.pow((fgB + 0.055f) / 1.055f, 2.4f);
150        float fgL = 0.2126f * fgR + 0.7152f * fgG + 0.0722f * fgB;
151
152        return Math.abs((fgL + 0.05f) / (bgL + 0.05f));
153    }
154
155    /** Returns the base color overlaid with another overlay color with a specified alpha. */
156    public static int getColorWithOverlay(int baseColor, int overlayColor, float overlayAlpha) {
157        return Color.rgb(
158            (int) (overlayAlpha * Color.red(baseColor) +
159                    (1f - overlayAlpha) * Color.red(overlayColor)),
160            (int) (overlayAlpha * Color.green(baseColor) +
161                    (1f - overlayAlpha) * Color.green(overlayColor)),
162            (int) (overlayAlpha * Color.blue(baseColor) +
163                    (1f - overlayAlpha) * Color.blue(overlayColor)));
164    }
165
166    /** Sets some private shadow properties. */
167    public static void setShadowProperty(String property, String value)
168            throws IllegalAccessException, InvocationTargetException {
169        sPropertyMethod.invoke(null, property, value);
170    }
171
172    /**
173     * Cancels an animation ensuring that if it has listeners, onCancel and onEnd
174     * are not called.
175     */
176    public static void cancelAnimationWithoutCallbacks(Animator animator) {
177        if (animator != null) {
178            animator.removeAllListeners();
179            animator.cancel();
180        }
181    }
182}
183