Add valueChanged() observable method
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<!-- The following code is revised from SmartClient demo code(SmartClient_70rc2_LGPL.zip).-->
<HTML><HEAD>
<SCRIPT>var isomorphicDir = "isomorphic/";</SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_Core.js></SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_Foundation.js></SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_Containers.js></SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_Grids.js></SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_Forms.js></SCRIPT>
<SCRIPT SRC=isomorphic/system/modules/ISC_DataBinding.js></SCRIPT>
<SCRIPT SRC=isomorphic/skins/standard/load_skin.js></SCRIPT>
<SCRIPT>
/*----------> SimpleSlider_5.js <----------*/
// Step 5
// * add valueChanged() observable method
ClassFactory.defineClass("SimpleSlider", Canvas);
SimpleSlider.addProperties({
length:200,
vertical:true,
thumbThickWidth:30,
thumbThinWidth:10,
trackWidth:4,
value:0,
sliderTarget:null,
initWidget : function () {
this.Super("initWidget", arguments);
var width, height;
if (this.vertical) {
width = Math.max(this.thumbThickWidth, this.trackWidth);
height = this.length;
} else {
width = this.length;
height = Math.max(this.thumbThickWidth, this.trackWidth);
}
this.setWidth(width);
this.setHeight(height);
this._usableLength = this.length-this.thumbThinWidth;
this._track = this.addChild(this._createTrack());
this._thumb = this.addChild(this._createThumb());
this.setValue(this.value);
},
_createTrack : function () {
return Canvas.create({
autoDraw:false,
left:(this.vertical ? Math.floor((this.getWidth() - this.trackWidth)/2) : 0),
top:(this.vertical ? 0 : Math.floor((this.getHeight() - this.trackWidth)/2)),
width:(this.vertical ? this.trackWidth : this.getWidth()),
height:(this.vertical ? this.getHeight() : this.trackWidth),
vertical:this.vertical,
backgroundColor:"#666666",
overflow:Canvas.HIDDEN
});
},
_createThumb : function () {
return Canvas.create({
autoDraw:false,
left:(this.vertical ? Math.floor((this.getWidth() - this.thumbThickWidth)/2) : 0),
top:(this.vertical ? 0 : Math.floor((this.getHeight() - this.thumbThickWidth)/2)),
width:(this.vertical ? this.thumbThickWidth : this.thumbThinWidth),
height:(this.vertical ? this.thumbThinWidth : this.thumbThickWidth),
canDrag:true,
dragAppearance:EventHandler.NONE,
dragMove:"this.parentElement._thumbMove(); return false",
dragStart:EventHandler.stopBubbling,
backgroundColor:"#AAAAAA"
});
},
_thumbMove : function () {
var thumbPosition;
if (this.vertical) {
thumbPosition = EventHandler.getY() - this.getPageTop();
thumbPosition = Math.max(0, Math.min(this._usableLength, thumbPosition));
if (thumbPosition == this._thumb.getTop()) return;
this._thumb.setTop(thumbPosition);
} else {
thumbPosition = EventHandler.getX() - this.getPageLeft();
thumbPosition = Math.max(0, Math.min(this._usableLength, thumbPosition));
if (thumbPosition == this._thumb.getLeft()) return;
this._thumb.setLeft(thumbPosition);
}
this.value = thumbPosition/this._usableLength;
this.valueChanged();
if (this.sliderTarget) EventHandler.handleEvent(this.sliderTarget, "sliderMove", this);
},
setValue : function (newValue) {
this.value = newValue;
var thumbPosition = this.value * this._usableLength;
if (this.vertical)
this._thumb.setTop(thumbPosition);
else
this._thumb.setLeft(thumbPosition);
this.valueChanged();
if (this.sliderTarget) EventHandler.handleEvent(this.sliderTarget, "sliderMove", this);
},
getValue : function () {
return this.value;
},
valueChanged : function () {
}
});
</SCRIPT>
</HEAD><BODY BGCOLOR='powderblue'>
<SCRIPT>
//--------------------------------------------------
// display area for targeted sliderMove events
//--------------------------------------------------
Label.create({
ID:"display",
left:150,
top:50,
height:20,
sliderMove:function(event,slider){
this.setContents("sliderMove event<br>" +
slider.getID() + ": " + slider.value);
}
});
//--------------------------------------------------
// global handler for sliderMove events
//--------------------------------------------------
Label.create({
ID:"globalDisplay",
left:300,
top:50,
height:20
});
Page.setEvent(
"sliderMove",
"globalDisplay.setContents('Global handler<br>' + eventInfo.ID + ': ' + eventInfo.value);"
);
//--------------------------------------------------
// sliders
//--------------------------------------------------
SimpleSlider.create({
ID:"vSlider",
left:100,
top:100,
value:0.3,
sliderTarget:display
});
SimpleSlider.create({
ID:"hSlider",
left:300,
top:180,
vertical:false,
value:0.5,
sliderTarget:display
});
//--------------------------------------------------
// display areas for observed slider values
//--------------------------------------------------
Label.create({
ID:"vSliderObserver",
left:20,
top:320,
height:20
});
vSliderObserver.observe(vSlider, "valueChanged", "observer.setContents(observed.value)");
Label.create({
ID:"hSliderObserver",
left:300,
top:320,
height:20
});
hSliderObserver.observe(hSlider, "valueChanged", "observer.setContents(observed.value)");
</SCRIPT>
</BODY>
</HTML>
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