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
|
import MessageListener from '../../MessageListener';
import Hint, { LinkHint, InputHint } from '../../presenters/Hint';
import * as dom from '../../../shared/utils/dom';
import * as messages from '../../../shared/messages';
import * as keyUtils from '../../../shared/utils/keys';
import TabsClient, { TabsClientImpl } from '../../client/TabsClient';
let tabsClient: TabsClient = new TabsClientImpl();
const TARGET_SELECTOR = [
'a', 'button', 'input', 'textarea', 'area',
'[contenteditable=true]', '[contenteditable=""]', '[tabindex]',
'[role="button"]', 'summary'
].join(',');
interface Size {
width: number;
height: number;
}
interface Point {
x: number;
y: number;
}
const inViewport = (
win: Window,
element: Element,
viewSize: Size,
framePosition: Point,
): boolean => {
let {
top, left, bottom, right
} = dom.viewportRect(element);
let doc = win.document;
let frameWidth = doc.documentElement.clientWidth;
let frameHeight = doc.documentElement.clientHeight;
if (right < 0 || bottom < 0 || top > frameHeight || left > frameWidth) {
// out of frame
return false;
}
if (right + framePosition.x < 0 || bottom + framePosition.y < 0 ||
left + framePosition.x > viewSize.width ||
top + framePosition.y > viewSize.height) {
// out of viewport
return false;
}
return true;
};
const isAriaHiddenOrAriaDisabled = (win: Window, element: Element): boolean => {
if (!element || win.document.documentElement === element) {
return false;
}
for (let attr of ['aria-hidden', 'aria-disabled']) {
let value = element.getAttribute(attr);
if (value !== null) {
let hidden = value.toLowerCase();
if (hidden === '' || hidden === 'true') {
return true;
}
}
}
return isAriaHiddenOrAriaDisabled(win, element.parentElement as Element);
};
export default class Follow {
private win: Window;
private hints: {[key: string]: Hint };
private targets: HTMLElement[] = [];
constructor(win: Window) {
this.win = win;
this.hints = {};
this.targets = [];
new MessageListener().onWebMessage(this.onMessage.bind(this));
}
key(key: keyUtils.Key): boolean {
if (Object.keys(this.hints).length === 0) {
return false;
}
this.win.parent.postMessage(JSON.stringify({
type: messages.FOLLOW_KEY_PRESS,
key: key.key,
ctrlKey: key.ctrlKey,
}), '*');
return true;
}
countHints(sender: any, viewSize: Size, framePosition: Point) {
this.targets = Follow.getTargetElements(this.win, viewSize, framePosition);
sender.postMessage(JSON.stringify({
type: messages.FOLLOW_RESPONSE_COUNT_TARGETS,
count: this.targets.length,
}), '*');
}
createHints(keysArray: string[]) {
if (keysArray.length !== this.targets.length) {
throw new Error('illegal hint count');
}
this.hints = {};
for (let i = 0; i < keysArray.length; ++i) {
let keys = keysArray[i];
let target = this.targets[i];
if (target instanceof HTMLAnchorElement ||
target instanceof HTMLAreaElement) {
this.hints[keys] = new LinkHint(target, keys);
} else {
this.hints[keys] = new InputHint(target, keys);
}
}
}
showHints(keys: string) {
Object.keys(this.hints).filter(key => key.startsWith(keys))
.forEach(key => this.hints[key].show());
Object.keys(this.hints).filter(key => !key.startsWith(keys))
.forEach(key => this.hints[key].hide());
}
removeHints() {
Object.keys(this.hints).forEach((key) => {
this.hints[key].remove();
});
this.hints = {};
this.targets = [];
}
async activateHints(keys: string, newTab: boolean, background: boolean): Promise<void> {
let hint = this.hints[keys];
if (!hint) {
return;
}
if (hint instanceof LinkHint) {
let url = hint.getLink();
// ignore taget='_blank'
if (!newTab && hint.getLinkTarget() !== '_blank') {
hint.click();
return;
}
// eslint-disable-next-line no-script-url
if (!url || url === '#' || url.toLowerCase().startsWith('javascript:')) {
return;
}
await tabsClient.openUrl(url, newTab, background);
} else if (hint instanceof InputHint) {
hint.activate();
}
}
onMessage(message: messages.Message, sender: any) {
switch (message.type) {
case messages.FOLLOW_REQUEST_COUNT_TARGETS:
return this.countHints(sender, message.viewSize, message.framePosition);
case messages.FOLLOW_CREATE_HINTS:
return this.createHints(message.keysArray);
case messages.FOLLOW_SHOW_HINTS:
return this.showHints(message.keys);
case messages.FOLLOW_ACTIVATE:
return this.activateHints(message.keys, message.newTab, message.background);
case messages.FOLLOW_REMOVE_HINTS:
return this.removeHints();
}
}
static getTargetElements(
win: Window,
viewSize:
Size, framePosition: Point,
): HTMLElement[] {
let all = win.document.querySelectorAll(TARGET_SELECTOR);
let filtered = Array.prototype.filter.call(all, (element: HTMLElement) => {
let style = win.getComputedStyle(element);
// AREA's 'display' in Browser style is 'none'
return (element.tagName === 'AREA' || style.display !== 'none') &&
style.visibility !== 'hidden' &&
(element as HTMLInputElement).type !== 'hidden' &&
element.offsetHeight > 0 &&
!isAriaHiddenOrAriaDisabled(win, element) &&
inViewport(win, element, viewSize, framePosition);
});
return filtered;
}
}
|
