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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
(function() {
/**
* Size of additional padding in the inner scrollable section of the dropdown.
*/
const DROPDOWN_INNER_PADDING = 12;
/** Size of vertical padding on the outer #dropdown element. */
const DROPDOWN_OUTER_PADDING = 2;
/** Minimum height of toolbar dropdowns (px). */
const MIN_DROPDOWN_HEIGHT = 200;
Polymer({
is: 'viewer-toolbar-dropdown',
properties: {
/** Icon to display when the dropdown is closed. */
closedIcon: String,
/** Whether the dropdown should be centered or right aligned. */
dropdownCentered: {
type: Boolean,
reflectToAttribute: true,
value: false,
},
/** True if the dropdown is currently open. */
dropdownOpen: {
type: Boolean,
reflectToAttribute: true,
value: false,
},
/**
* String to be displayed at the top of the dropdown and for the tooltip
* of the button.
*/
header: String,
/** Whether to hide the header at the top of the dropdown. */
hideHeader: {
type: Boolean,
value: false,
},
/** Lowest vertical point that the dropdown should occupy (px). */
lowerBound: {
type: Number,
observer: 'lowerBoundChanged_',
},
/** Unique id to identify this dropdown for metrics purposes. */
metricsId: String,
/** Whether the dropdown must be selected before opening. */
openAfterSelect: {
type: Boolean,
value: false,
},
/** Icon to display when the dropdown is open. */
openIcon: String,
/** Whether the dropdown is marked as selected. */
selected: {
type: Boolean,
reflectToAttribute: true,
value: false,
},
/**
* Toolbar icon currently being displayed.
* @private
*/
dropdownIcon_: {
type: String,
computed: 'computeIcon_(dropdownOpen, closedIcon, openIcon)',
},
},
/**
* Current animation being played, or null if there is none.
* @private {?Object}
*/
animation_: null,
/**
* True if the max-height CSS property for the dropdown scroll container
* is valid. If false, the height will be updated the next time the
* dropdown is visible.
* @private {boolean}
*/
maxHeightValid_: false,
/**
* @return {string} Current icon for the dropdown.
* @private
*/
computeIcon_: function(dropdownOpen, closedIcon, openIcon) {
return dropdownOpen ? openIcon : closedIcon;
},
/** @private */
lowerBoundChanged_: function() {
this.maxHeightValid_ = false;
if (this.dropdownOpen) {
this.updateMaxHeight();
}
},
toggleDropdown: function() {
if (!this.dropdownOpen && this.openAfterSelect && !this.selected) {
// The dropdown has `openAfterSelect` set, but is not yet selected.
return;
}
this.dropdownOpen = !this.dropdownOpen;
if (this.dropdownOpen) {
this.$.dropdown.style.display = 'block';
if (!this.maxHeightValid_) {
this.updateMaxHeight();
}
this.fire('dropdown-opened', this.metricsId);
}
if (this.dropdownOpen) {
const listener = (e) => {
if (e.path.includes(this)) {
return;
}
if (this.dropdownOpen) {
this.toggleDropdown();
this.blur();
}
// Clean up the handler. The dropdown may already be closed.
window.removeEventListener('pointerdown', listener);
};
window.addEventListener('pointerdown', listener);
}
this.playAnimation_(this.dropdownOpen);
},
updateMaxHeight: function() {
const scrollContainer = this.$['scroll-container'];
let height = this.lowerBound - scrollContainer.getBoundingClientRect().top -
DROPDOWN_INNER_PADDING;
height = Math.max(height, MIN_DROPDOWN_HEIGHT);
scrollContainer.style.maxHeight = height + 'px';
this.maxHeightValid_ = true;
},
/**
* Start an animation on the dropdown.
* @param {boolean} isEntry True to play entry animation, false to play
* exit.
* @private
*/
playAnimation_: function(isEntry) {
this.animation_ = isEntry ? this.animateEntry_() : this.animateExit_();
this.animation_.onfinish = () => {
this.animation_ = null;
if (!this.dropdownOpen) {
this.$.dropdown.style.display = 'none';
}
};
},
/**
* @return {!Object} Animation
* @private
*/
animateEntry_: function() {
let maxHeight =
this.$.dropdown.getBoundingClientRect().height - DROPDOWN_OUTER_PADDING;
if (maxHeight < 0) {
maxHeight = 0;
}
this.$.dropdown.animate(
{
opacity: [0, 1],
},
{
duration: 150,
easing: 'cubic-bezier(0, 0, 0.2, 1)',
});
return this.$.dropdown.animate(
[
{height: '20px', transform: 'translateY(-10px)'},
{height: maxHeight + 'px', transform: 'translateY(0)'},
],
{
duration: 250,
easing: 'cubic-bezier(0, 0, 0.2, 1)',
});
},
/**
* @return {!Object} Animation
* @private
*/
animateExit_: function() {
return this.$.dropdown.animate(
[
{transform: 'translateY(0)', opacity: 1},
{transform: 'translateY(-5px)', opacity: 0},
],
{
duration: 100,
easing: 'cubic-bezier(0.4, 0, 1, 1)',
});
}
});
})();
|
