TaskViewTransform.java revision 680888123db816ad0c5f082d1e9b3f9b756bc7b6 
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    public float dimAlpha = 0f;
90
91    public boolean visible = false;
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     * Fills int this transform from the state of the given TaskView.
98     */
99    public void fillIn(TaskView tv) {
100        translationZ = tv.getTranslationZ();
101        scale = tv.getScaleX();
102        alpha = tv.getAlpha();
103        visible = true;
104        dimAlpha = tv.getDimAlpha();
105        rect.set(tv.getLeft(), tv.getTop(), tv.getRight(), tv.getBottom());
106    }
107
108    /**
109     * Copies the transform state from another {@link TaskViewTransform}.
110     */
111    public void copyFrom(TaskViewTransform other) {
112        translationZ = other.translationZ;
113        scale = other.scale;
114        alpha = other.alpha;
115        visible = other.visible;
116        dimAlpha = other.dimAlpha;
117        rect.set(other.rect);
118    }
119
120    /**
121     * Resets the current transform.
122     */
123    public void reset() {
124        translationZ = 0;
125        scale = 1f;
126        alpha = 1f;
127        dimAlpha = 0f;
128        visible = false;
129        rect.setEmpty();
130    }
131
132    /** Convenience functions to compare against current property values */
133    public boolean hasAlphaChangedFrom(float v) {
134        return (Float.compare(alpha, v) != 0);
135    }
136
137    public boolean hasScaleChangedFrom(float v) {
138        return (Float.compare(scale, v) != 0);
139    }
140
141    public boolean hasTranslationZChangedFrom(float v) {
142        return (Float.compare(translationZ, v) != 0);
143    }
144
145    public boolean hasRectChangedFrom(View v) {
146        return ((int) rect.left != v.getLeft()) || ((int) rect.right != v.getRight()) ||
147                ((int) rect.top != v.getTop()) || ((int) rect.bottom != v.getBottom());
148    }
149
150    /**
151     * Applies this transform to a view.
152     */
153    public void applyToTaskView(TaskView v, ArrayList<Animator> animators,
154            AnimationProps animation, boolean allowShadows) {
155        // Return early if not visible
156        if (!visible) {
157            return;
158        }
159
160        if (animation.isImmediate()) {
161            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
162                v.setTranslationZ(translationZ);
163            }
164            if (hasScaleChangedFrom(v.getScaleX())) {
165                v.setScaleX(scale);
166                v.setScaleY(scale);
167            }
168            if (hasAlphaChangedFrom(v.getAlpha())) {
169                v.setAlpha(alpha);
170            }
171            if (hasRectChangedFrom(v)) {
172                v.setLeftTopRightBottom((int) rect.left, (int) rect.top, (int) rect.right,
173                        (int) rect.bottom);
174            }
175        } else {
176            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
177                ObjectAnimator anim = ObjectAnimator.ofFloat(v, View.TRANSLATION_Z,
178                        v.getTranslationZ(), translationZ);
179                animators.add(animation.apply(AnimationProps.TRANSLATION_Z, anim));
180            }
181            if (hasScaleChangedFrom(v.getScaleX())) {
182                ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(v,
183                        PropertyValuesHolder.ofFloat(View.SCALE_X, v.getScaleX(), scale),
184                        PropertyValuesHolder.ofFloat(View.SCALE_Y, v.getScaleX(), scale));
185                animators.add(animation.apply(AnimationProps.SCALE, anim));
186            }
187            if (hasAlphaChangedFrom(v.getAlpha())) {
188                ObjectAnimator anim = ObjectAnimator.ofFloat(v, View.ALPHA, v.getAlpha(), alpha);
189                animators.add(animation.apply(AnimationProps.ALPHA, anim));
190            }
191            if (hasRectChangedFrom(v)) {
192                ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(v,
193                        PropertyValuesHolder.ofInt(LEFT, v.getLeft(), (int) rect.left),
194                        PropertyValuesHolder.ofInt(TOP, v.getTop(), (int) rect.top),
195                        PropertyValuesHolder.ofInt(RIGHT, v.getRight(), (int) rect.right),
196                        PropertyValuesHolder.ofInt(BOTTOM, v.getBottom(), (int) rect.bottom));
197                animators.add(animation.apply(AnimationProps.BOUNDS, anim));
198            }
199        }
200    }
201
202    /** Reset the transform on a view. */
203    public static void reset(TaskView v) {
204        v.setTranslationX(0f);
205        v.setTranslationY(0f);
206        v.setTranslationZ(0f);
207        v.setScaleX(1f);
208        v.setScaleY(1f);
209        v.setAlpha(1f);
210        v.getViewBounds().setClipBottom(0);
211        v.setLeftTopRightBottom(0, 0, 0, 0);
212    }
213}
214