1/*
2 * Copyright (C) 2011 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.contacts.quickcontact;
18
19import com.android.contacts.R;
20
21import android.animation.Animator;
22import android.animation.Animator.AnimatorListener;
23import android.content.Context;
24import android.content.res.Resources;
25import android.graphics.Rect;
26import android.graphics.drawable.Drawable;
27import android.util.AttributeSet;
28import android.view.MotionEvent;
29import android.view.View;
30import android.view.ViewPropertyAnimator;
31import android.view.animation.AnimationUtils;
32import android.widget.FrameLayout;
33import android.widget.PopupWindow;
34
35/**
36 * Layout containing single child {@link View} which it attempts to center
37 * around {@link #setChildTargetScreen(Rect)}.
38 * <p>
39 * Updates drawable state to be {@link android.R.attr#state_first} when child is
40 * above target, and {@link android.R.attr#state_last} when child is below
41 * target. Also updates {@link Drawable#setLevel(int)} on child
42 * {@link View#getBackground()} to reflect horizontal center of target.
43 * <p>
44 * The reason for this approach is because target {@link Rect} is in screen
45 * coordinates disregarding decor insets; otherwise something like
46 * {@link PopupWindow} might work better.
47 */
48public class FloatingChildLayout extends FrameLayout {
49    private static final String TAG = "FloatingChild";
50    private int mFixedTopPosition;
51    private View mChild;
52    private Rect mTargetScreen = new Rect();
53    private final int mAnimationDuration;
54
55    public FloatingChildLayout(Context context, AttributeSet attrs) {
56        super(context, attrs);
57        final Resources resources = getResources();
58        mFixedTopPosition =
59                resources.getDimensionPixelOffset(R.dimen.quick_contact_top_position);
60        mAnimationDuration = resources.getInteger(android.R.integer.config_shortAnimTime);
61    }
62
63    @Override
64    protected void onFinishInflate() {
65        mChild = findViewById(android.R.id.content);
66        mChild.setDuplicateParentStateEnabled(true);
67
68        // this will be expanded in showChild()
69        mChild.setScaleX(0.0f);
70        mChild.setScaleY(0.0f);
71        mChild.setAlpha(0.0f);
72    }
73
74    public View getChild() {
75        return mChild;
76    }
77
78    /**
79     * Set {@link Rect} in screen coordinates that {@link #getChild()} should be
80     * centered around.
81     */
82    public void setChildTargetScreen(Rect targetScreen) {
83        mTargetScreen = targetScreen;
84        requestLayout();
85    }
86
87    /**
88     * Return {@link #mTargetScreen} in local window coordinates, taking any
89     * decor insets into account.
90     */
91    private Rect getTargetInWindow() {
92        final Rect windowScreen = new Rect();
93        getWindowVisibleDisplayFrame(windowScreen);
94
95        final Rect target = new Rect(mTargetScreen);
96        target.offset(-windowScreen.left, -windowScreen.top);
97        return target;
98    }
99
100    @Override
101    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
102
103        final View child = mChild;
104        final Rect target = getTargetInWindow();
105
106        final int childWidth = child.getMeasuredWidth();
107        final int childHeight = child.getMeasuredHeight();
108
109        if (mFixedTopPosition != -1) {
110            // Horizontally centered, vertically fixed position
111            final int childLeft = (getWidth() - childWidth) / 2;
112            final int childTop = mFixedTopPosition;
113            layoutChild(child, childLeft, childTop);
114        } else {
115            // default is centered horizontally around target...
116            final int childLeft = target.centerX() - (childWidth / 2);
117            // ... and vertically aligned a bit below centered
118            final int childTop = target.centerY() - Math.round(childHeight * 0.35f);
119
120            // when child is outside bounds, nudge back inside
121            final int clampedChildLeft = clampDimension(childLeft, childWidth, getWidth());
122            final int clampedChildTop = clampDimension(childTop, childHeight, getHeight());
123
124            layoutChild(child, clampedChildLeft, clampedChildTop);
125        }
126    }
127
128    private static int clampDimension(int value, int size, int max) {
129        // when larger than bounds, just center
130        if (size > max) {
131            return (max - size) / 2;
132        }
133
134        // clamp to bounds
135        return Math.min(Math.max(value, 0), max - size);
136    }
137
138    private static void layoutChild(View child, int left, int top) {
139        child.layout(left, top, left + child.getMeasuredWidth(), top + child.getMeasuredHeight());
140    }
141
142    /** Begin animating {@link #getChild()} visible. */
143    public void showChild(Runnable onAnimationEndRunnable) {
144        animateScale(false, onAnimationEndRunnable);
145    }
146
147    /** Begin animating {@link #getChild()} invisible. */
148    public void hideChild(Runnable onAnimationEndRunnable) {
149        animateScale(true, onAnimationEndRunnable);
150    }
151
152    /** Creates the open/close animation */
153    private void animateScale(boolean isExitAnimation, final Runnable onAnimationEndRunnable) {
154        mChild.setPivotX(mTargetScreen.centerX() - mChild.getLeft());
155        mChild.setPivotY(mTargetScreen.centerY() - mChild.getTop());
156        ViewPropertyAnimator animator = mChild.animate();
157        animator.setDuration(mAnimationDuration);
158        final int scaleInterpolator = isExitAnimation ? android.R.interpolator.accelerate_quint
159                : android.R.interpolator.decelerate_quint;
160        animator.setInterpolator(AnimationUtils.loadInterpolator(getContext(), scaleInterpolator));
161        final float scaleTarget = isExitAnimation ? 0.5f : 1.0f;
162        animator.scaleX(scaleTarget);
163        animator.scaleY(scaleTarget);
164        animator.alpha(isExitAnimation ? 0.0f : 1.0f);
165
166        if (onAnimationEndRunnable != null) {
167            animator.setListener(new AnimatorListener() {
168                @Override
169                public void onAnimationStart(Animator animation) {}
170
171                @Override
172                public void onAnimationRepeat(Animator animation) {}
173
174                @Override
175                public void onAnimationCancel(Animator animation) {}
176
177                @Override
178                public void onAnimationEnd(Animator animation) {
179                    onAnimationEndRunnable.run();
180                }
181            });
182        }
183    }
184
185    private View.OnTouchListener mOutsideTouchListener;
186
187    public void setOnOutsideTouchListener(View.OnTouchListener listener) {
188        mOutsideTouchListener = listener;
189    }
190
191    @Override
192    public boolean onTouchEvent(MotionEvent event) {
193        // at this point, touch wasn't handled by child view; assume outside
194        if (mOutsideTouchListener != null) {
195            return mOutsideTouchListener.onTouch(this, event);
196        }
197        return false;
198    }
199}
200