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ss.js
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"use strict"
class ScrollSelector {
constructor(data, cb) {
this.close();
$('<div id="scroll-selector-el"><div class="inner"></div><span class="scroll-selector-selected-top-hr"></span><span class="scroll-selector-selected-bottom-hr"></span><div class="scroll-selector-operator"><a class="scroll-selector-operator-cancel">取消</a><a class="scroll-selector-operator-submit">确定</a></div></div>')
.appendTo('body');
this.top_base = 90.0;
this.data = data;
this.append_options(this.data);
this.cb = cb;
var _this = this;
$('.scroll-selector-operator-cancel').on('click', function () {
_this.close();
});
$('.scroll-selector-operator-submit').on('click', function () {
_this.cb.call(_this, _this.make_values(_this.data));
_this.close();
});
}
_normal_distribution(x) {
// σ ^ 2 == .7
return 1 / Math.sqrt(2 * Math.PI * .7) * Math.pow(Math.E, -1 * x * x * .5 / .7);
}
update_options(group, level) {
for (let i in group.options) {
var opt = group.options[i];
var delta = i - group.selected;
level = level || 0;
var li = $('.scroll-selector-options-level-' + (level) + ' li:eq(' +(i)+ ')');
li.css('transform', 'translate(0, ' + (this.top_base + delta * 20 * 1.8 - Math.max( -200, Math.min(200, ((delta > 0 ? 1 : -1) * delta * delta * 3)))) + 'px ) scale( '+(1 - Math.abs(delta) * .03)+', '+(1 - Math.abs(delta) * .1)+' )')
.css('-webkit-transform', 'translate(0, ' + (this.top_base + delta * 20 * 1.8 - Math.max( -200, Math.min(200, ((delta > 0 ? 1 : -1) * delta * delta * 3)))) + 'px ) scale( '+(1 - Math.abs(delta) * .03)+', '+(1 - Math.abs(delta) * .1)+' )')
.css('opacity', 0.3 + this._normal_distribution(delta * 3.2));
if (i == group.selected && opt.sub) {
var t = level + 1;
while( $( '.scroll-selector-options-level-' + t ).length > 0 ) {
$( '.scroll-selector-options-level-' + t ).remove();
t++;
}
this.append_options( opt.sub, level + 1 );
}
if (i == group.selected && group.option_maker) {
var t = level + 1;
while( $( '.scroll-selector-options-level-' + t ).length > 0 ) {
$( '.scroll-selector-options-level-' + t ).remove();
t++;
}
opt.sub = {};
opt.sub.option_maker = group.option_maker;
this.append_options(opt.sub, level + 1);
}
}
}
append_options(group, level) {
var top_base = 90.0;
var _this = this;
group.selected = group.selected || 0;
level = level || 0;
if ( group.option_maker ) {
var g = group.option_maker.call( this, this.make_values( this.data ), level );
if ( ! g ) {
return;
}
group.options = g.options;
group.selected = g.selected || 0;
}
$('<ul class="scroll-selector-options-level-'+(level)+'"></ul>').appendTo($('#scroll-selector-el .inner'));
var ul = $( '.scroll-selector-options-level-'+(level) );
for (let i in group.options) {
var opt = group.options[i];
var delta = i - group.selected;
var li = $('<li></li>');
li.css('transform', 'translate(0, ' + (this.top_base + delta * 20 * 1.8 - Math.max( -200, Math.min(200, ((delta > 0 ? 1 : -1) * delta * delta * 3)))) + 'px ) scale( '+(1 - Math.abs(delta) * .03)+', '+(1 - Math.abs(delta) * .1)+' )')
.css('-webkit-transform', 'translate(0, ' + (this.top_base + delta * 20 * 1.8 - Math.max( -200, Math.min(200, ((delta > 0 ? 1 : -1) * delta * delta * 3)))) + 'px ) scale( '+(1 - Math.abs(delta) * .03)+', '+(1 - Math.abs(delta) * .1)+' )')
.css('opacity', 0.3 + this._normal_distribution(delta * 3.2));
li.html(opt.name);
li.appendTo(ul);
if (i == group.selected && opt.sub) {
this.append_options(opt.sub, level + 1);
}
if (i == group.selected && group.option_maker) {
opt.sub = {};
opt.sub.option_maker = group.option_maker;
this.append_options(opt.sub, level + 1);
}
}
ul
.on('click', function(e){
e.preventDefault();
e.stopPropagation();
})
.on('touchstart', function (e) {
e.preventDefault();
e.stopPropagation();
_this.touch_start.call(_this, e, group, level);
})
.on('touchmove', function (e) {
e.preventDefault();
e.stopPropagation();
_this.touch_move.call(_this, e, group, level);
})
.on('touchend', function (e) {
e.preventDefault();
e.stopPropagation();
_this.touch_end.call(_this, e, group, level);
})
.on('wheel', function (e) {
e.preventDefault();
e.stopPropagation();
_this.wheel.call(_this, e, group, level);
});
}
touch_start(event, group, level) {
group.move_start = event.touches[0].clientY;
group.move_prev = event.touches[0].clientY;
}
touch_move(event, group, level) {
var curr = event.touches[0].clientY;
var delta = curr - group.move_prev;
group.selected -= delta / 40.0;
group.selected = Math.max(0, Math.min(group.options.length - 1, group.selected));
this.update_options(group, level);
group.move_prev = curr;
}
touch_end(event, group, level) {
var dec = group.selected - parseInt(group.selected);
var target = parseInt(group.selected) + (dec > .5 ? 1 : 0);
var li = $('.scroll-selector-options-level-'+(level)+' li');
li.addClass('transition');
group.selected = target;
this.update_options(group, level);
setTimeout(function () {
li.removeClass('transition');
}, 200);
}
wheel(event, group, level) {
var li = $('.scroll-selector-options-level-'+(level)+' li');
li.addClass('transition');
group.selected = Math.max(0, Math.min(group.options.length - 1, group.selected + (event.originalEvent.deltaY > 0 ? 1 : -1)));
this.update_options(group, level);
setTimeout(function () {
li.removeClass('transition');
}, 200);
}
close() {
$('#scroll-selector-el').remove();
}
make_values(group, values) {
values = values || [];
if ( ! group.options ) {
return;
}
values.push(group.options[parseInt(group.selected || 0)]);
// 如果有级联
if (group.options && group.options[parseInt(group.selected) || 0].sub) {
this.make_values(group.options[parseInt(group.selected) || 0].sub, values);
}
return values;
}
}