TaskViewTransform.java revision 778f495f0431be15c4c4f4305960465afe0e6d3a 
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.views;
18
19import android.animation.Animator;
20import android.animation.ObjectAnimator;
21import android.animation.PropertyValuesHolder;
22import android.graphics.RectF;
23import android.util.IntProperty;
24import android.util.Property;
25import android.view.View;
26
27import java.util.ArrayList;
28
29/**
30 * The visual properties for a {@link TaskView}.
31 */
32public class TaskViewTransform {
33
34    public static final Property<View, Integer> LEFT =
35            new IntProperty<View>("left") {
36                @Override
37                public void setValue(View object, int v) {
38                    object.setLeft(v);
39                }
40
41                @Override
42                public Integer get(View object) {
43                    return object.getLeft();
44                }
45            };
46
47    public static final Property<View, Integer> TOP =
48            new IntProperty<View>("top") {
49                @Override
50                public void setValue(View object, int v) {
51                    object.setTop(v);
52                }
53
54                @Override
55                public Integer get(View object) {
56                    return object.getTop();
57                }
58            };
59
60    public static final Property<View, Integer> RIGHT =
61            new IntProperty<View>("right") {
62                @Override
63                public void setValue(View object, int v) {
64                    object.setRight(v);
65                }
66
67                @Override
68                public Integer get(View object) {
69                    return object.getRight();
70                }
71            };
72
73    public static final Property<View, Integer> BOTTOM =
74            new IntProperty<View>("bottom") {
75                @Override
76                public void setValue(View object, int v) {
77                    object.setBottom(v);
78                }
79
80                @Override
81                public Integer get(View object) {
82                    return object.getBottom();
83                }
84            };
85
86    public float translationZ = 0;
87    public float scale = 1f;
88    public float alpha = 1f;
89
90    public boolean visible = false;
91    float p = 0f;
92
93    // This is a window-space rect used for positioning the task in the stack and freeform workspace
94    public RectF rect = new RectF();
95
96    /**
97     * Resets the current transform.
98     */
99    public void reset() {
100        translationZ = 0;
101        scale = 1f;
102        alpha = 1f;
103        visible = false;
104        rect.setEmpty();
105        p = 0f;
106    }
107
108    /** Convenience functions to compare against current property values */
109    public boolean hasAlphaChangedFrom(float v) {
110        return (Float.compare(alpha, v) != 0);
111    }
112
113    public boolean hasScaleChangedFrom(float v) {
114        return (Float.compare(scale, v) != 0);
115    }
116
117    public boolean hasTranslationZChangedFrom(float v) {
118        return (Float.compare(translationZ, v) != 0);
119    }
120
121    public boolean hasRectChangedFrom(View v) {
122        return ((int) rect.left != v.getLeft()) || ((int) rect.right != v.getRight()) ||
123                ((int) rect.top != v.getTop()) || ((int) rect.bottom != v.getBottom());
124    }
125
126    /**
127     * Applies this transform to a view.
128     *
129     * @return whether hardware layers are required for this animation.
130     */
131    public boolean applyToTaskView(TaskView v, ArrayList<Animator> animators,
132            TaskViewAnimation taskAnimation, boolean allowShadows) {
133        // Return early if not visible
134        boolean requiresHwLayers = false;
135        if (!visible) {
136            return requiresHwLayers;
137        }
138
139        if (taskAnimation.isImmediate()) {
140            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
141                v.setTranslationZ(translationZ);
142            }
143            if (hasScaleChangedFrom(v.getScaleX())) {
144                v.setScaleX(scale);
145                v.setScaleY(scale);
146            }
147            if (hasAlphaChangedFrom(v.getAlpha())) {
148                v.setAlpha(alpha);
149            }
150            if (hasRectChangedFrom(v)) {
151                v.setLeftTopRightBottom((int) rect.left, (int) rect.top, (int) rect.right,
152                        (int) rect.bottom);
153            }
154        } else {
155            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
156                animators.add(ObjectAnimator.ofFloat(v, View.TRANSLATION_Z, v.getTranslationZ(),
157                        translationZ));
158            }
159            if (hasScaleChangedFrom(v.getScaleX())) {
160                animators.add(ObjectAnimator.ofPropertyValuesHolder(v,
161                        PropertyValuesHolder.ofFloat(View.SCALE_X, v.getScaleX(), scale),
162                        PropertyValuesHolder.ofFloat(View.SCALE_Y, v.getScaleX(), scale)));
163            }
164            if (hasAlphaChangedFrom(v.getAlpha())) {
165                animators.add(ObjectAnimator.ofFloat(v, View.ALPHA, v.getAlpha(), alpha));
166                requiresHwLayers = true;
167            }
168            if (hasRectChangedFrom(v)) {
169                animators.add(ObjectAnimator.ofPropertyValuesHolder(v,
170                        PropertyValuesHolder.ofInt(LEFT, v.getLeft(), (int) rect.left),
171                        PropertyValuesHolder.ofInt(TOP, v.getTop(), (int) rect.top),
172                        PropertyValuesHolder.ofInt(RIGHT, v.getRight(), (int) rect.right),
173                        PropertyValuesHolder.ofInt(BOTTOM, v.getBottom(), (int) rect.bottom)));
174            }
175        }
176        return requiresHwLayers;
177    }
178
179    /** Reset the transform on a view. */
180    public static void reset(TaskView v) {
181        v.setTranslationX(0f);
182        v.setTranslationY(0f);
183        v.setTranslationZ(0f);
184        v.setScaleX(1f);
185        v.setScaleY(1f);
186        v.setAlpha(1f);
187        v.getViewBounds().setClipBottom(0);
188        v.setLeftTopRightBottom(0, 0, 0, 0);
189    }
190}
191