1/*
2 * Copyright (C) 2015 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.stackdivider;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.ObjectAnimator;
23import android.annotation.Nullable;
24import android.content.Context;
25import android.graphics.Canvas;
26import android.graphics.Paint;
27import android.util.AttributeSet;
28import android.util.Property;
29import android.view.View;
30
31import com.android.systemui.Interpolators;
32import com.android.systemui.R;
33
34/**
35 * View for the handle in the docked stack divider.
36 */
37public class DividerHandleView extends View {
38
39    private final static Property<DividerHandleView, Integer> WIDTH_PROPERTY
40            = new Property<DividerHandleView, Integer>(Integer.class, "width") {
41
42        @Override
43        public Integer get(DividerHandleView object) {
44            return object.mCurrentWidth;
45        }
46
47        @Override
48        public void set(DividerHandleView object, Integer value) {
49            object.mCurrentWidth = value;
50            object.invalidate();
51        }
52    };
53
54    private final static Property<DividerHandleView, Integer> HEIGHT_PROPERTY
55            = new Property<DividerHandleView, Integer>(Integer.class, "height") {
56
57        @Override
58        public Integer get(DividerHandleView object) {
59            return object.mCurrentHeight;
60        }
61
62        @Override
63        public void set(DividerHandleView object, Integer value) {
64            object.mCurrentHeight = value;
65            object.invalidate();
66        }
67    };
68
69    private final Paint mPaint = new Paint();
70    private final int mWidth;
71    private final int mHeight;
72    private final int mCircleDiameter;
73    private int mCurrentWidth;
74    private int mCurrentHeight;
75    private AnimatorSet mAnimator;
76    private boolean mTouching;
77
78    public DividerHandleView(Context context, @Nullable AttributeSet attrs) {
79        super(context, attrs);
80        mPaint.setColor(getResources().getColor(R.color.docked_divider_handle, null));
81        mPaint.setAntiAlias(true);
82        mWidth = getResources().getDimensionPixelSize(R.dimen.docked_divider_handle_width);
83        mHeight = getResources().getDimensionPixelSize(R.dimen.docked_divider_handle_height);
84        mCurrentWidth = mWidth;
85        mCurrentHeight = mHeight;
86        mCircleDiameter = (mWidth + mHeight) / 3;
87    }
88
89    public void setTouching(boolean touching, boolean animate) {
90        if (touching == mTouching) {
91            return;
92        }
93        if (mAnimator != null) {
94            mAnimator.cancel();
95            mAnimator = null;
96        }
97        if (!animate) {
98            if (touching) {
99                mCurrentWidth = mCircleDiameter;
100                mCurrentHeight = mCircleDiameter;
101            } else {
102                mCurrentWidth = mWidth;
103                mCurrentHeight = mHeight;
104            }
105            invalidate();
106        } else {
107            animateToTarget(touching ? mCircleDiameter : mWidth,
108                    touching ? mCircleDiameter : mHeight, touching);
109        }
110        mTouching = touching;
111    }
112
113    private void animateToTarget(int targetWidth, int targetHeight, boolean touching) {
114        ObjectAnimator widthAnimator = ObjectAnimator.ofInt(this, WIDTH_PROPERTY,
115                mCurrentWidth, targetWidth);
116        ObjectAnimator heightAnimator = ObjectAnimator.ofInt(this, HEIGHT_PROPERTY,
117                mCurrentHeight, targetHeight);
118        mAnimator = new AnimatorSet();
119        mAnimator.playTogether(widthAnimator, heightAnimator);
120        mAnimator.setDuration(touching
121                ? DividerView.TOUCH_ANIMATION_DURATION
122                : DividerView.TOUCH_RELEASE_ANIMATION_DURATION);
123        mAnimator.setInterpolator(touching
124                ? Interpolators.TOUCH_RESPONSE
125                : Interpolators.FAST_OUT_SLOW_IN);
126        mAnimator.addListener(new AnimatorListenerAdapter() {
127            @Override
128            public void onAnimationEnd(Animator animation) {
129                mAnimator = null;
130            }
131        });
132        mAnimator.start();
133    }
134
135    @Override
136    protected void onDraw(Canvas canvas) {
137        int left = getWidth() / 2 - mCurrentWidth / 2;
138        int top = getHeight() / 2 - mCurrentHeight / 2;
139        int radius = Math.min(mCurrentWidth, mCurrentHeight) / 2;
140        canvas.drawRoundRect(left, top, left + mCurrentWidth, top + mCurrentHeight,
141                radius, radius, mPaint);
142    }
143
144    @Override
145    public boolean hasOverlappingRendering() {
146        return false;
147    }
148}
149