source: trunk/www.guidonia.net/wp/wp-includes/js/scriptaculous/slider.js@ 44

Last change on this file since 44 was 44, checked in by luciano, 15 years ago
File size: 10.1 KB
Line 
1// script.aculo.us slider.js v1.8.0, Tue Nov 06 15:01:40 +0300 2007
2
3// Copyright (c) 2005-2007 Marty Haught, Thomas Fuchs
4//
5// script.aculo.us is freely distributable under the terms of an MIT-style license.
6// For details, see the script.aculo.us web site: http://script.aculo.us/
7
8if (!Control) var Control = { };
9
10// options:
11// axis: 'vertical', or 'horizontal' (default)
12//
13// callbacks:
14// onChange(value)
15// onSlide(value)
16Control.Slider = Class.create({
17 initialize: function(handle, track, options) {
18 var slider = this;
19
20 if (Object.isArray(handle)) {
21 this.handles = handle.collect( function(e) { return $(e) });
22 } else {
23 this.handles = [$(handle)];
24 }
25
26 this.track = $(track);
27 this.options = options || { };
28
29 this.axis = this.options.axis || 'horizontal';
30 this.increment = this.options.increment || 1;
31 this.step = parseInt(this.options.step || '1');
32 this.range = this.options.range || $R(0,1);
33
34 this.value = 0; // assure backwards compat
35 this.values = this.handles.map( function() { return 0 });
36 this.spans = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
37 this.options.startSpan = $(this.options.startSpan || null);
38 this.options.endSpan = $(this.options.endSpan || null);
39
40 this.restricted = this.options.restricted || false;
41
42 this.maximum = this.options.maximum || this.range.end;
43 this.minimum = this.options.minimum || this.range.start;
44
45 // Will be used to align the handle onto the track, if necessary
46 this.alignX = parseInt(this.options.alignX || '0');
47 this.alignY = parseInt(this.options.alignY || '0');
48
49 this.trackLength = this.maximumOffset() - this.minimumOffset();
50
51 this.handleLength = this.isVertical() ?
52 (this.handles[0].offsetHeight != 0 ?
53 this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) :
54 (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth :
55 this.handles[0].style.width.replace(/px$/,""));
56
57 this.active = false;
58 this.dragging = false;
59 this.disabled = false;
60
61 if (this.options.disabled) this.setDisabled();
62
63 // Allowed values array
64 this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
65 if (this.allowedValues) {
66 this.minimum = this.allowedValues.min();
67 this.maximum = this.allowedValues.max();
68 }
69
70 this.eventMouseDown = this.startDrag.bindAsEventListener(this);
71 this.eventMouseUp = this.endDrag.bindAsEventListener(this);
72 this.eventMouseMove = this.update.bindAsEventListener(this);
73
74 // Initialize handles in reverse (make sure first handle is active)
75 this.handles.each( function(h,i) {
76 i = slider.handles.length-1-i;
77 slider.setValue(parseFloat(
78 (Object.isArray(slider.options.sliderValue) ?
79 slider.options.sliderValue[i] : slider.options.sliderValue) ||
80 slider.range.start), i);
81 h.makePositioned().observe("mousedown", slider.eventMouseDown);
82 });
83
84 this.track.observe("mousedown", this.eventMouseDown);
85 document.observe("mouseup", this.eventMouseUp);
86 document.observe("mousemove", this.eventMouseMove);
87
88 this.initialized = true;
89 },
90 dispose: function() {
91 var slider = this;
92 Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
93 Event.stopObserving(document, "mouseup", this.eventMouseUp);
94 Event.stopObserving(document, "mousemove", this.eventMouseMove);
95 this.handles.each( function(h) {
96 Event.stopObserving(h, "mousedown", slider.eventMouseDown);
97 });
98 },
99 setDisabled: function(){
100 this.disabled = true;
101 },
102 setEnabled: function(){
103 this.disabled = false;
104 },
105 getNearestValue: function(value){
106 if (this.allowedValues){
107 if (value >= this.allowedValues.max()) return(this.allowedValues.max());
108 if (value <= this.allowedValues.min()) return(this.allowedValues.min());
109
110 var offset = Math.abs(this.allowedValues[0] - value);
111 var newValue = this.allowedValues[0];
112 this.allowedValues.each( function(v) {
113 var currentOffset = Math.abs(v - value);
114 if (currentOffset <= offset){
115 newValue = v;
116 offset = currentOffset;
117 }
118 });
119 return newValue;
120 }
121 if (value > this.range.end) return this.range.end;
122 if (value < this.range.start) return this.range.start;
123 return value;
124 },
125 setValue: function(sliderValue, handleIdx){
126 if (!this.active) {
127 this.activeHandleIdx = handleIdx || 0;
128 this.activeHandle = this.handles[this.activeHandleIdx];
129 this.updateStyles();
130 }
131 handleIdx = handleIdx || this.activeHandleIdx || 0;
132 if (this.initialized && this.restricted) {
133 if ((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
134 sliderValue = this.values[handleIdx-1];
135 if ((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
136 sliderValue = this.values[handleIdx+1];
137 }
138 sliderValue = this.getNearestValue(sliderValue);
139 this.values[handleIdx] = sliderValue;
140 this.value = this.values[0]; // assure backwards compat
141
142 this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] =
143 this.translateToPx(sliderValue);
144
145 this.drawSpans();
146 if (!this.dragging || !this.event) this.updateFinished();
147 },
148 setValueBy: function(delta, handleIdx) {
149 this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta,
150 handleIdx || this.activeHandleIdx || 0);
151 },
152 translateToPx: function(value) {
153 return Math.round(
154 ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) *
155 (value - this.range.start)) + "px";
156 },
157 translateToValue: function(offset) {
158 return ((offset/(this.trackLength-this.handleLength) *
159 (this.range.end-this.range.start)) + this.range.start);
160 },
161 getRange: function(range) {
162 var v = this.values.sortBy(Prototype.K);
163 range = range || 0;
164 return $R(v[range],v[range+1]);
165 },
166 minimumOffset: function(){
167 return(this.isVertical() ? this.alignY : this.alignX);
168 },
169 maximumOffset: function(){
170 return(this.isVertical() ?
171 (this.track.offsetHeight != 0 ? this.track.offsetHeight :
172 this.track.style.height.replace(/px$/,"")) - this.alignY :
173 (this.track.offsetWidth != 0 ? this.track.offsetWidth :
174 this.track.style.width.replace(/px$/,"")) - this.alignX);
175 },
176 isVertical: function(){
177 return (this.axis == 'vertical');
178 },
179 drawSpans: function() {
180 var slider = this;
181 if (this.spans)
182 $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
183 if (this.options.startSpan)
184 this.setSpan(this.options.startSpan,
185 $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
186 if (this.options.endSpan)
187 this.setSpan(this.options.endSpan,
188 $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
189 },
190 setSpan: function(span, range) {
191 if (this.isVertical()) {
192 span.style.top = this.translateToPx(range.start);
193 span.style.height = this.translateToPx(range.end - range.start + this.range.start);
194 } else {
195 span.style.left = this.translateToPx(range.start);
196 span.style.width = this.translateToPx(range.end - range.start + this.range.start);
197 }
198 },
199 updateStyles: function() {
200 this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
201 Element.addClassName(this.activeHandle, 'selected');
202 },
203 startDrag: function(event) {
204 if (Event.isLeftClick(event)) {
205 if (!this.disabled){
206 this.active = true;
207
208 var handle = Event.element(event);
209 var pointer = [Event.pointerX(event), Event.pointerY(event)];
210 var track = handle;
211 if (track==this.track) {
212 var offsets = Position.cumulativeOffset(this.track);
213 this.event = event;
214 this.setValue(this.translateToValue(
215 (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
216 ));
217 var offsets = Position.cumulativeOffset(this.activeHandle);
218 this.offsetX = (pointer[0] - offsets[0]);
219 this.offsetY = (pointer[1] - offsets[1]);
220 } else {
221 // find the handle (prevents issues with Safari)
222 while((this.handles.indexOf(handle) == -1) && handle.parentNode)
223 handle = handle.parentNode;
224
225 if (this.handles.indexOf(handle)!=-1) {
226 this.activeHandle = handle;
227 this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
228 this.updateStyles();
229
230 var offsets = Position.cumulativeOffset(this.activeHandle);
231 this.offsetX = (pointer[0] - offsets[0]);
232 this.offsetY = (pointer[1] - offsets[1]);
233 }
234 }
235 }
236 Event.stop(event);
237 }
238 },
239 update: function(event) {
240 if (this.active) {
241 if (!this.dragging) this.dragging = true;
242 this.draw(event);
243 if (Prototype.Browser.WebKit) window.scrollBy(0,0);
244 Event.stop(event);
245 }
246 },
247 draw: function(event) {
248 var pointer = [Event.pointerX(event), Event.pointerY(event)];
249 var offsets = Position.cumulativeOffset(this.track);
250 pointer[0] -= this.offsetX + offsets[0];
251 pointer[1] -= this.offsetY + offsets[1];
252 this.event = event;
253 this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
254 if (this.initialized && this.options.onSlide)
255 this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
256 },
257 endDrag: function(event) {
258 if (this.active && this.dragging) {
259 this.finishDrag(event, true);
260 Event.stop(event);
261 }
262 this.active = false;
263 this.dragging = false;
264 },
265 finishDrag: function(event, success) {
266 this.active = false;
267 this.dragging = false;
268 this.updateFinished();
269 },
270 updateFinished: function() {
271 if (this.initialized && this.options.onChange)
272 this.options.onChange(this.values.length>1 ? this.values : this.value, this);
273 this.event = null;
274 }
275});
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