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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package org.chromium.chrome.browser.contextmenu; | 5 package org.chromium.chrome.browser.contextmenu; |
6 | 6 |
7 import android.animation.Animator; | |
8 import android.animation.AnimatorListenerAdapter; | |
9 import android.animation.ValueAnimator; | |
10 import android.animation.ValueAnimator.AnimatorUpdateListener; | |
7 import android.content.Context; | 11 import android.content.Context; |
12 import android.graphics.Canvas; | |
13 import android.graphics.drawable.Drawable; | |
8 import android.support.v4.view.ViewPager; | 14 import android.support.v4.view.ViewPager; |
15 import android.support.v4.view.animation.LinearOutSlowInInterpolator; | |
9 import android.util.AttributeSet; | 16 import android.util.AttributeSet; |
10 import android.view.View; | 17 import android.view.View; |
11 | 18 |
19 import org.chromium.base.ApiCompatibilityUtils; | |
12 import org.chromium.chrome.R; | 20 import org.chromium.chrome.R; |
13 | 21 |
14 /** | 22 /** |
15 * When there is more than one view for the context menu to display, it wraps th e display in a view | 23 * When there is more than one view for the context menu to display, it wraps th e display in a view |
16 * pager. | 24 * pager. |
17 */ | 25 */ |
18 public class TabularContextMenuViewPager extends ViewPager { | 26 public class TabularContextMenuViewPager extends ViewPager { |
27 private static final int ANIMATION_DURATION_MS = 250; | |
28 | |
29 private ValueAnimator mAnimator; | |
30 private int mOldHeight; | |
31 private int mCanvasWidth; | |
32 private int mClipHeight; | |
33 | |
34 private int mDifferenceInHeight = 0; | |
Ted C
2017/07/20 22:00:55
0 is the default value in java, so you don't need
Daniel Park
2017/07/20 22:19:38
Done.
| |
35 private int mPreviousChildIndex = 1; | |
19 private final int mContextMenuMinimumPaddingPx = | 36 private final int mContextMenuMinimumPaddingPx = |
Ted C
2017/07/20 22:00:55
nit, but put the finals above non-finals
Daniel Park
2017/07/20 22:19:37
Done.
| |
20 getResources().getDimensionPixelSize(R.dimen.context_menu_min_paddin g); | 37 getResources().getDimensionPixelSize(R.dimen.context_menu_min_paddin g); |
38 private final Drawable mDrawable = ApiCompatibilityUtils.getDrawable( | |
Ted C
2017/07/20 22:00:55
Let's call this something like mBackgroundDrawable
Daniel Park
2017/07/20 22:19:38
Done.
| |
39 getResources(), R.drawable.white_with_rounded_corners); | |
21 | 40 |
22 public TabularContextMenuViewPager(Context context) { | 41 public TabularContextMenuViewPager(Context context) { |
Ted C
2017/07/20 22:00:55
I think you should be able to delete this construc
Daniel Park
2017/07/20 22:19:38
Done.
| |
23 super(context); | 42 super(context); |
43 mDrawable.mutate(); | |
24 } | 44 } |
25 | 45 |
26 public TabularContextMenuViewPager(Context context, AttributeSet attrs) { | 46 public TabularContextMenuViewPager(Context context, AttributeSet attrs) { |
27 super(context, attrs); | 47 super(context, attrs); |
48 mDrawable.mutate(); | |
28 } | 49 } |
29 | 50 |
30 /** | 51 /** |
31 * Used to show the full ViewPager dialog. Without this the dialog would hav e no height or | 52 * Used to show the full ViewPager dialog. Without this the dialog would hav e no height or |
32 * width. | 53 * width. |
33 */ | 54 */ |
34 @Override | 55 @Override |
35 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | 56 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
57 int tabHeight = 0; | |
36 int menuHeight = 0; | 58 int menuHeight = 0; |
37 int tabHeight = 0; | |
38 | |
39 // getCurrentItem() does not take into account the tab layout unlike get ChildCount(). | |
40 int currentItemsIndex = getCurrentItem() + 1; | |
41 | 59 |
42 // The width of the context menu is defined so that it leaves space betw een itself and the | 60 // The width of the context menu is defined so that it leaves space betw een itself and the |
43 // screen's edges. It is also bounded to a max size to prevent the menu from stretching | 61 // screen's edges. It is also bounded to a max size to prevent the menu from stretching |
44 // across a large display (e.g. a tablet screen). | 62 // across a large display (e.g. a tablet screen). |
45 int deviceWidthPx = getResources().getDisplayMetrics().widthPixels; | 63 int appWindowWidthPx = getResources().getDisplayMetrics().widthPixels; |
46 int contextMenuWidth = Math.min(deviceWidthPx - 2 * mContextMenuMinimumP addingPx, | 64 int contextMenuWidth = Math.min(appWindowWidthPx - 2 * mContextMenuMinim umPaddingPx, |
47 getResources().getDimensionPixelSize(R.dimen.context_menu_max_wi dth)); | 65 getResources().getDimensionPixelSize(R.dimen.context_menu_max_wi dth)); |
48 | 66 |
49 widthMeasureSpec = MeasureSpec.makeMeasureSpec(contextMenuWidth, Measure Spec.EXACTLY); | 67 widthMeasureSpec = MeasureSpec.makeMeasureSpec(contextMenuWidth, Measure Spec.EXACTLY); |
50 | 68 |
51 // The height of the context menu is calculated as the sum of: | 69 // getCurrentItem() returns the index of the current page in the pager's pages. |
52 // 1. The tab bar's height, which is only visible when the context menu requires it | 70 // It does not take into account the tab layout like getChildCount(), so we add 1. |
53 // (i.e. an ImageLink is clicked) | 71 int currentChildIndex = getCurrentItem() + 1; |
54 // 2. The height of the View being displayed for the current tab. | |
55 for (int i = 0; i < getChildCount(); i++) { | |
56 View child = getChildAt(i); | |
57 | 72 |
58 child.measure( | 73 // Handles the case where this is called while the pager is scrolling be tween views. |
59 widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec .UNSPECIFIED)); | 74 // The height should remain the same as the height of the last view seen before scrolling. |
60 int measuredHeight = child.getMeasuredHeight(); | 75 if (getScrollX() != 0 && getScrollX() != mCanvasWidth) { |
76 heightMeasureSpec = MeasureSpec.makeMeasureSpec(mOldHeight, MeasureS pec.EXACTLY); | |
77 } else { | |
78 // The height of the context menu is calculated as the sum of: | |
79 // 1. The tab bar's height, which is only visible when the context m enu requires it | |
80 // (i.e. an ImageLink is clicked) | |
81 // 2. The height of the View being displayed for the current tab. | |
82 for (int i = 0; i < getChildCount(); i++) { | |
83 View child = getChildAt(i); | |
84 child.measure( | |
85 widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, Measure Spec.UNSPECIFIED)); | |
86 int measuredHeight = child.getMeasuredHeight(); | |
61 | 87 |
62 // The ViewPager also considers the tab layout one of its children, and needs to be | 88 // The ViewPager also considers the tab layout one of its childr en, and needs to be |
63 // treated separately from getting the largest height. | 89 // treated separately from getting the largest height. |
64 if (child.getId() == R.id.tab_layout && child.getVisibility() != GON E) { | 90 if (child.getId() == R.id.tab_layout && child.getVisibility() != GONE) { |
65 tabHeight = measuredHeight; | 91 tabHeight = measuredHeight; |
66 } else if (i == currentItemsIndex) { | 92 } else if (i == currentChildIndex) { |
67 menuHeight = child.getMeasuredHeight(); | 93 menuHeight = child.getMeasuredHeight(); |
68 break; | 94 break; |
95 } | |
96 } | |
97 int fullHeight = menuHeight + tabHeight; | |
98 int appWindowHeightPx = getResources().getDisplayMetrics().heightPix els; | |
99 fullHeight = Math.min(fullHeight, appWindowHeightPx - 2 * mContextMe nuMinimumPaddingPx); | |
100 mDifferenceInHeight = fullHeight - mOldHeight; | |
101 | |
102 if (currentChildIndex == mPreviousChildIndex) { | |
103 // Handles the snapping of the view when its height changes | |
104 // (i.e. an image finished loading or the link became fully visi ble). | |
105 // The pager will immediately snap to the new height. | |
106 mClipHeight = fullHeight; | |
107 if (menuHeight != 0) mOldHeight = fullHeight; | |
108 heightMeasureSpec = MeasureSpec.makeMeasureSpec(fullHeight, Meas ureSpec.EXACTLY); | |
109 } else { | |
110 // Handles the case where the view pager has completely scrolled to a different | |
111 // child. It will measure to the larger height so the clipping i s visible. | |
112 initAnimator(); | |
113 heightMeasureSpec = MeasureSpec.makeMeasureSpec( | |
114 Math.max(mOldHeight, fullHeight), MeasureSpec.EXACTLY); | |
69 } | 115 } |
70 } | 116 } |
117 super.onMeasure(widthMeasureSpec, heightMeasureSpec); | |
118 mPreviousChildIndex = currentChildIndex; | |
119 // The animation is only visible when switching to a tab with a differen t height. | |
Theresa
2017/07/20 21:54:58
nit: s/visible/run
Daniel Park
2017/07/20 22:19:38
Done.
| |
120 if (mAnimator != null) mAnimator.start(); | |
121 } | |
71 | 122 |
72 // Cap the height of the context menu so that it fits on the screen with out touching the | 123 private void initAnimator() { |
73 // screen's edges. | 124 if (mAnimator != null) return; |
74 int fullHeight = menuHeight + tabHeight; | 125 mAnimator = ValueAnimator.ofFloat(0f, 1f); |
75 int deviceHeightPx = getResources().getDisplayMetrics().heightPixels; | 126 mAnimator.setDuration(ANIMATION_DURATION_MS); |
76 fullHeight = Math.min(fullHeight, deviceHeightPx - 2 * mContextMenuMinim umPaddingPx); | 127 mAnimator.setInterpolator(new LinearOutSlowInInterpolator()); |
128 mAnimator.addUpdateListener(new AnimatorUpdateListener() { | |
77 | 129 |
78 heightMeasureSpec = MeasureSpec.makeMeasureSpec(fullHeight, MeasureSpec. EXACTLY); | 130 @Override |
79 super.onMeasure(widthMeasureSpec, heightMeasureSpec); | 131 public void onAnimationUpdate(ValueAnimator animation) { |
132 float animatedValue = (float) animation.getAnimatedValue(); | |
133 if (mDifferenceInHeight < 0) { | |
134 setTranslationY(animatedValue * -mDifferenceInHeight / 2); | |
135 } else { | |
136 setTranslationY((1 - animatedValue) * mDifferenceInHeight / 2); | |
137 } | |
138 mClipHeight = mOldHeight + (int) (mDifferenceInHeight * animated Value); | |
139 invalidate(); | |
140 } | |
141 }); | |
142 mAnimator.addListener(new AnimatorListenerAdapter() { | |
143 @Override | |
144 public void onAnimationEnd(Animator animation) { | |
145 mOldHeight = mClipHeight; | |
146 setTranslationY(0); | |
147 if (mDifferenceInHeight < 0) requestLayout(); | |
148 } | |
149 }); | |
150 } | |
151 | |
152 @Override | |
153 public void onDraw(Canvas canvas) { | |
154 mCanvasWidth = canvas.getWidth(); | |
155 int backgroundOffsetX = getScrollX(); | |
156 mDrawable.setBounds( | |
157 backgroundOffsetX, 0, canvas.getWidth() + backgroundOffsetX, mCl ipHeight); | |
158 mDrawable.draw(canvas); | |
159 | |
160 boolean clipped = false; | |
161 if (mClipHeight != 0) { | |
162 canvas.save(); | |
163 canvas.clipRect(0, 0, mCanvasWidth, mClipHeight); | |
164 clipped = true; | |
165 } | |
166 | |
167 super.onDraw(canvas); | |
168 | |
169 if (clipped) { | |
170 canvas.restore(); | |
171 } | |
80 } | 172 } |
81 } | 173 } |
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