TaskViewTransform.java revision 8aa9959413a06c3d2ff75e0c7be9e3cb7ac7cd2e 
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
92    // This is the relative task progress of this task, relative to the stack scroll at which this
93    // transform was computed
94    public float p = 0f;
95
96    // This is a window-space rect used for positioning the task in the stack and freeform workspace
97    public RectF rect = new RectF();
98
99    /**
100     * Fills int this transform from the state of the given TaskView.
101     */
102    public void fillIn(TaskView tv) {
103        translationZ = tv.getTranslationZ();
104        scale = tv.getScaleX();
105        alpha = tv.getAlpha();
106        visible = true;
107        p = tv.getTaskProgress();
108        rect.set(tv.getLeft(), tv.getTop(), tv.getRight(), tv.getBottom());
109    }
110
111    /**
112     * Copies the transform state from another {@link TaskViewTransform}.
113     */
114    public void copyFrom(TaskViewTransform other) {
115        translationZ = other.translationZ;
116        scale = other.scale;
117        alpha = other.alpha;
118        visible = other.visible;
119        p = other.p;
120        rect.set(other.rect);
121    }
122
123    /**
124     * Resets the current transform.
125     */
126    public void reset() {
127        translationZ = 0;
128        scale = 1f;
129        alpha = 1f;
130        visible = false;
131        rect.setEmpty();
132        p = 0f;
133    }
134
135    /** Convenience functions to compare against current property values */
136    public boolean hasAlphaChangedFrom(float v) {
137        return (Float.compare(alpha, v) != 0);
138    }
139
140    public boolean hasScaleChangedFrom(float v) {
141        return (Float.compare(scale, v) != 0);
142    }
143
144    public boolean hasTranslationZChangedFrom(float v) {
145        return (Float.compare(translationZ, v) != 0);
146    }
147
148    public boolean hasRectChangedFrom(View v) {
149        return ((int) rect.left != v.getLeft()) || ((int) rect.right != v.getRight()) ||
150                ((int) rect.top != v.getTop()) || ((int) rect.bottom != v.getBottom());
151    }
152
153    /**
154     * Applies this transform to a view.
155     */
156    public void applyToTaskView(TaskView v, ArrayList<Animator> animators,
157            TaskViewAnimation taskAnimation, boolean allowShadows) {
158        // Return early if not visible
159        if (!visible) {
160            return;
161        }
162
163        if (taskAnimation.isImmediate()) {
164            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
165                v.setTranslationZ(translationZ);
166            }
167            if (hasScaleChangedFrom(v.getScaleX())) {
168                v.setScaleX(scale);
169                v.setScaleY(scale);
170            }
171            if (hasAlphaChangedFrom(v.getAlpha())) {
172                v.setAlpha(alpha);
173            }
174            if (hasRectChangedFrom(v)) {
175                v.setLeftTopRightBottom((int) rect.left, (int) rect.top, (int) rect.right,
176                        (int) rect.bottom);
177            }
178        } else {
179            if (allowShadows && hasTranslationZChangedFrom(v.getTranslationZ())) {
180                animators.add(ObjectAnimator.ofFloat(v, View.TRANSLATION_Z, v.getTranslationZ(),
181                        translationZ));
182            }
183            if (hasScaleChangedFrom(v.getScaleX())) {
184                animators.add(ObjectAnimator.ofPropertyValuesHolder(v,
185                        PropertyValuesHolder.ofFloat(View.SCALE_X, v.getScaleX(), scale),
186                        PropertyValuesHolder.ofFloat(View.SCALE_Y, v.getScaleX(), scale)));
187            }
188            if (hasAlphaChangedFrom(v.getAlpha())) {
189                animators.add(ObjectAnimator.ofFloat(v, View.ALPHA, v.getAlpha(), alpha));
190            }
191            if (hasRectChangedFrom(v)) {
192                animators.add(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            }
198        }
199    }
200
201    /** Reset the transform on a view. */
202    public static void reset(TaskView v) {
203        v.setTranslationX(0f);
204        v.setTranslationY(0f);
205        v.setTranslationZ(0f);
206        v.setScaleX(1f);
207        v.setScaleY(1f);
208        v.setAlpha(1f);
209        v.getViewBounds().setClipBottom(0);
210        v.setLeftTopRightBottom(0, 0, 0, 0);
211    }
212}
213