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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import { html } from "chrome://global/content/vendor/lit.all.mjs";
import { MozLitElement } from "chrome://global/content/lit-utils.mjs";
/**
* A grouping of navigation buttons that is displayed at the page level,
* intended to change the selected view, provide a heading, and have links
* to external resources.
*
* @tagname moz-page-nav
* @property {string} currentView - The currently selected view.
* @property {string} heading - A heading to be displayed at the top of the navigation.
* @slot [default] - Used to append moz-page-nav-button elements to the navigation.
*/
export default class MozPageNav extends MozLitElement {
static properties = {
currentView: { type: String },
heading: { type: String },
};
static queries = {
headingEl: "#page-nav-header",
primaryNavGroupSlot: ".primary-nav-group slot",
secondaryNavGroupSlot: "#secondary-nav-group slot",
};
get pageNavButtons() {
return this.primaryNavGroupSlot
.assignedNodes()
.filter(
node => node?.localName === "moz-page-nav-button" && !node.hidden
);
}
onChangeView(e) {
this.currentView = e.target.view;
}
handleFocus(e) {
if (e.key == "ArrowDown" || e.key == "ArrowRight") {
e.preventDefault();
this.focusNextView();
} else if (e.key == "ArrowUp" || e.key == "ArrowLeft") {
e.preventDefault();
this.focusPreviousView();
}
}
focusPreviousView() {
let pageNavButtons = this.pageNavButtons;
let currentIndex = pageNavButtons.findIndex(b => b.selected);
let prev = pageNavButtons[currentIndex - 1];
if (prev) {
prev.activate();
prev.buttonEl.focus();
}
}
focusNextView() {
let pageNavButtons = this.pageNavButtons;
let currentIndex = pageNavButtons.findIndex(b => b.selected);
let next = pageNavButtons[currentIndex + 1];
if (next) {
next.activate();
next.buttonEl.focus();
}
}
render() {
return html`
<link
rel="stylesheet"
href="chrome://global/content/elements/moz-page-nav.css"
/>
<nav>
<h1 class="page-nav-header" id="page-nav-header">${this.heading}</h1>
<div
class="primary-nav-group"
role="tablist"
aria-orientation="vertical"
aria-labelledby="page-nav-header"
>
<slot
@change-view=${this.onChangeView}
@keydown=${this.handleFocus}
></slot>
</div>
<div id="secondary-nav-group" role="group">
<slot name="secondary-nav" @keydown=${this.handleFocus}></slot>
</div>
</nav>
`;
}
updated() {
let isViewSelected = false;
let assignedPageNavButtons = this.pageNavButtons;
for (let button of assignedPageNavButtons) {
button.selected = button.view == this.currentView;
isViewSelected = isViewSelected || button.selected;
}
if (!isViewSelected && assignedPageNavButtons.length) {
// Current page nav has no matching view, reset to the first view.
assignedPageNavButtons[0].activate();
}
}
}
customElements.define("moz-page-nav", MozPageNav);
/**
* A navigation button intended to change the selected view within a page.
*
* @tagname moz-page-nav-button
* @property {string} iconSrc - The chrome:// url for the icon used for the button.
* @property {string} l10nId - The fluent ID for the button's text
* @property {boolean} selected - Whether or not the button is currently selected.
* @slot [default] - Used to append the l10n string to the button.
*/
export class MozPageNavButton extends MozLitElement {
static properties = {
iconSrc: { type: String },
l10nId: { type: String },
selected: { type: Boolean },
};
connectedCallback() {
super.connectedCallback();
this.setAttribute("role", "none");
}
static queries = {
buttonEl: "button",
};
get view() {
return this.getAttribute("view");
}
activate() {
this.dispatchEvent(
new CustomEvent("change-view", {
bubbles: true,
composed: true,
})
);
}
render() {
return html`
<link
rel="stylesheet"
href="chrome://global/content/elements/moz-page-nav-button.css"
/>
<button
aria-selected=${this.selected}
tabindex=${this.selected ? 0 : -1}
role="tab"
?selected=${this.selected}
@click=${this.activate}
>
<img class="page-nav-icon" src=${this.iconSrc} />
<slot></slot>
</button>
`;
}
}
customElements.define("moz-page-nav-button", MozPageNavButton);
|
