-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
scrollbar.js
320 lines (282 loc) · 11.5 KB
/
scrollbar.js
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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
S.scrollbar = {
config: { skip: 15 },
selected: { },
items: [],
add: function (container, options) {
//options = {
// footer (int || function): space between bottom of container & window edge,
// touch (bool) //allows touch scrolling
// touchStart: callback function(TouchEvent, options)
// touchEnd: callback function(TouchEvent, options)
// moved: callback function(options)
//}
//add custom scrollbar to container
var mutationObserver = window.MutationObserver || window.WebKitMutationObserver;
var resizeObserver = window.ResizeObserver || window.WebKitResizeObserver;
let opts = options != null ? options : {};
let c = $(container);
c.addClass('scrollable');
if (c.find('.scroller').length == 0) {
//generate scrollbar
c.prepend('<div class="scroller"><div class="scrollbar"></div></div>');
}
//add events
c.find('.scrollbar').on('mousedown', (e) => S.scrollbar.start(e, opts));
c.find('.scroller').on('mousedown', (e) => S.scrollbar.bar.start(e, opts));
c.on('wheel', (e) => S.scrollbar.wheel(e, opts));
if (opts.touch === true) {
c.on('touchstart', (e) => S.scrollbar.touchstart(e, { ...opts, istouch: true }));
c.on('touchmove', (e) => S.scrollbar.touchmove(e, { ...opts, istouch: true }));
c.on('touchend', (e) => S.scrollbar.touchend(e, { ...opts, istouch: true }));
}
for (let x = 0; x < c.length; x++) {
let cn = $(c[x]);
//add scrollbar to items list
S.scrollbar.items.push({ container: $(cn), options: opts, percent: 0 });
//resize each container
S.scrollbar.resize($(cn), opts);
//add event listener for DOM changes within the container to trigger resize callback
let movable = $(cn).find('.movable');
let callback_resize = () => S.scrollbar.resize($(cn), opts);
let mutated = false;
if (mutationObserver) {
// define a new observer
var obs = new mutationObserver(function (mutations, observer) {
if (mutated == true) { return; }
if (mutations.length >= 1) {
var elem = $(mutations[0].target);
if (elem.parent().hasClass('scrollable')) { return; }
}
mutated = true;
callback_resize();
setTimeout(() => { mutated = false; }, 10);
})
// have the observer observe changes in children
obs.observe(movable[0], { attributes: true, childList: true, subtree: true });
}
else if (window.addEventListener) {
movable[0].addEventListener('DOMNodeInserted', callback_resize, false);
movable[0].addEventListener('DOMNodeRemoved', callback_resize, false);
}
//add event listener for container element node resize
if (resizeObserver) {
var obs = new resizeObserver(function (elements) {
callback_resize();
})
// have the observer observe foo for changes in children
obs.observe(cn[0]);
}
}
},
target: function (e) {
var target = $(e);
if (target.hasClass('.scrollable')) { return target; }
let targets = $(e).parents('.scrollable');
if (targets.length > 0) {
return targets[0];
}
},
get: function (target) {
const win = S.window.pos();
const container = $(target);
const scrollbar = container.find('.scrollbar');
const movable = container.find('.movable');
const scroller = container.find('.scroller');
const pos = container[0].getBoundingClientRect();
let foot = 0;
//get scrollbar item from cache
let index = S.scrollbar.items.map(a => a.container).findIndex(a => a.filter((i, b) => container[0] == b).length > 0);
let item = S.scrollbar.items[index];
if (item.options.footer != null) {
if (typeof item.options.footer == 'function') {
foot = item.options.footer(container);
} else {
foot = item.options.footer;
}
} else {
foot = win.h - pos.top - pos.height;
}
const height = win.h - pos.top - foot;
//show/hide list scrollbar
let h = movable.height();
let barHeight = ((height - 7) / h) * height;
return {
scrollbar: scrollbar,
height: height,
foot: foot,
barHeight: barHeight,
container: container,
movable: movable,
contentH: h,
offsetY: scroller.offset().top,
barY: scrollbar.offset().top,
options: item.options,
index: index,
diff: (1 / height) * ((height / h) * (height - 7))
};
},
start: function (e, options) {
if (!options.istouch === true) {
e.stopPropagation();
e.stopPropagation();
e.preventDefault();
}
//get target container
let target = S.scrollbar.target(e.target);
//update class for container
const container = $(target);
S.scrollbar.selected.container = null;
if (!container.hasClass('scroll')) { return;}
container.addClass('scrolling');
//update selected properties
S.scrollbar.selected = S.scrollbar.get(target);
S.scrollbar.selected.cursorY = e.clientY;
S.scrollbar.selected.currentY = e.clientY;
S.scrollbar.selected.scrolling = true;
if (!options.istouch === true) {
//bind events
$(window).on('mousemove', S.scrollbar.moving);
$(window).on('mouseup', S.scrollbar.stop);
}
//animate scrollbar
S.scrollbar.animate.call(S.scrollbar);
},
touchstart: function (e, options) {
S.scrollbar.start(e.touches[0], options);
if (S.scrollbar.selected.container == null) { return; }
if (typeof options.touchStart == 'function') {
options.touchStart(e, options);
}
},
touchmove: function (e, options) {
var touch = e.touches[0];
var sel = S.scrollbar.selected;
S.scrollbar.selected.currentY = sel.cursorY + ((sel.cursorY - touch.clientY) * sel.diff);
},
touchend: function (e, options) {
if (S.scrollbar.selected.container == null) { return;}
S.scrollbar.selected.scrolling = false;
S.scrollbar.selected.container.removeClass('scrolling');
if (typeof options.touchEnd == 'function') {
options.touchEnd(e, options);
}
},
moving: function (e) {
//called when user moves mouse
S.scrollbar.selected.currentY = e.clientY;
},
animate: function () {
//steady animation of scrolling movement
const item = S.scrollbar.selected;
const curr = item.currentY - item.cursorY - (item.offsetY - item.barY);
let perc = S.math.clamp((100 / (item.height - 7 - item.barHeight)) * curr, 0, 100);
S.scrollbar.to(item, perc);
requestAnimationFrame(() => {
if (S.scrollbar.selected.scrolling == true) {
S.scrollbar.animate.call(S.scrollbar);
}
});
},
stop: function () {
S.scrollbar.selected.scrolling = false;
$(window).off('mousemove', S.scrollbar.moving);
$(window).off('mouseup', S.scrollbar.stop);
S.scrollbar.selected.container.removeClass('scrolling');
},
to: function (item, percent) {
percent = parseInt(percent);
let perc = S.math.clamp(percent, 0, 100);
var top = -1 * Math.round((((item.contentH - item.height) / 100) * perc));
if (top > 0) { top = 0;}
S.scrollbar.items[item.index].percent = percent;
item.scrollbar.css({ top: Math.round(((item.height - 7 - item.barHeight) / 100) * perc) });
item.movable.css({ top: top });
if (item.options.moved) { item.options.moved(item);}
},
move: function (px) {
const item = S.scrollbar.selected;
const movable = item.movable;
let pos = movable.position();
let perc = (100 / (item.contentH - item.height - 7)) * (-pos.top + px);
S.scrollbar.to(item, perc);
},
bar: {
timer: null,
start: function(e, options) {
if ($(e.target).hasClass('scrollbar')) { return false; }
S.scrollbar.selected = S.scrollbar.get(S.scrollbar.target(e.target));
const item = S.scrollbar.selected;
const scrollbar = item.scrollbar;
const pos = scrollbar.offset();
const y = e.clientY;
let top = false;
if (y < pos.top) { top = true; }
S.scrollbar.bar.move(top);
//listen for mouse up
$(window).on('mouseup', S.scrollbar.bar.end);
//move bar in intervals if mouse is held down long enough
setTimeout(() => {
S.scrollbar.bar.timer = setInterval(() => S.scrollbar.bar.move(top), 50);
}, 300);
},
move: function (top) {
if (top === true) {
//above scrollbar
S.scrollbar.move(-S.scrollbar.config.skip * 8);
} else {
//below scrollbar
S.scrollbar.move(S.scrollbar.config.skip * 8);
}
},
end: function () {
clearInterval(S.scrollbar.bar.timer);
$(window).off('mouseup', S.scrollbar.bar.end);
}
},
wheel: function (e, options) {
let delta = 0;
if (!e) e = window.event;
// normalize delta
if (e.wheelDelta) {
// IE and Opera
delta = e.wheelDelta / 60;
} else if (e.detail) {
// W3C
delta = -e.detail / 2;
}
const target = S.scrollbar.target(e.target);
if ($(target).hasClass('scroll')) {
S.scrollbar.selected = S.scrollbar.get(target);
S.scrollbar.move(-delta * S.scrollbar.config.skip);
}
},
resize: function (container, options) {
//resize list height
for (let x = 0; x < container.length; x++) {
const c = $(container[x]);
const movable = c.find('.movable');
let h = movable.height();
if (h == 0) { continue; }
const pos = c[0].getBoundingClientRect();
const height = pos.height;
const item = S.scrollbar.get(c, options);
if (h > height + 1) {
//show scrollbar
c.addClass('scroll');
//update scrollbar height
c.find('.scroller').css({ height: height - 7 });
c.find('.scrollbar').css({ height: Math.round(((height - 7) / h) * height) });
} else {
//hide scrollbar
c.removeClass('scroll');
}
S.scrollbar.to(item, S.scrollbar.items[item.index].percent);
};
},
update: function (container) {
const c = $(container);
let item = S.scrollbar.items.filter(a => a.container.filter((i, b) => c[0] == b).length > 0);
if (item.length == 0) { return; }
S.scrollbar.resize(item[0].container, item[0].options);
}
};