1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
cr.define('cr.ui', function() {
/**
* An image button that brings up an informative bubble when activated by
* keyboard or mouse.
* @constructor
* @extends {HTMLSpanElement}
* @implements {EventListener}
*/
const BubbleButton = cr.ui.define('span');
BubbleButton.prototype = {
__proto__: HTMLSpanElement.prototype,
/**
* Decorates the base element to show the proper icon.
*/
decorate() {
this.className = 'bubble-button';
this.location = cr.ui.ArrowLocation.TOP_END;
this.image = document.createElement('div');
this.image.tabIndex = 0;
this.image.setAttribute('role', 'button');
this.image.addEventListener('click', this);
this.image.addEventListener('keydown', this);
this.image.addEventListener('mousedown', this);
this.appendChild(this.image);
},
/**
* Whether the button is currently showing a bubble.
* @type {boolean}
*/
get showingBubble() {
return this.image.classList.contains('showing-bubble');
},
set showingBubble(showing) {
this.image.classList.toggle('showing-bubble', showing);
},
/**
* Handle mouse and keyboard events, allowing the user to open and close an
* informative bubble.
* @param {Event} event Mouse or keyboard event.
*/
handleEvent(event) {
switch (event.type) {
// Toggle the bubble on left click. Let any other clicks propagate.
case 'click':
if (event.button !== 0) {
return;
}
break;
// Toggle the bubble when <Return> or <Space> is pressed. Let any other
// key presses propagate.
case 'keydown':
switch (event.keyCode) {
case 13: // Return.
case 32: // Space.
break;
default:
return;
}
break;
// Blur focus when a mouse button is pressed, matching the behavior of
// other Web UI elements.
case 'mousedown':
if (document.activeElement) {
document.activeElement.blur();
}
event.preventDefault();
return;
}
this.toggleBubble();
event.preventDefault();
event.stopPropagation();
},
/**
* Abstract method: subclasses should overwrite it. There is no way to mark
* method as abstract for Closure Compiler, as of
* https://github.com/google/closure-compiler/issues/104.
* @type {!Function|undefined}
* @protected
*/
toggleBubble: assertNotReached,
};
// Export.
return {BubbleButton: BubbleButton};
});
|
