paper.js/src/tool/Tool.js

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var Tool = this.Tool = ToolHandler.extend(new function() {
function viewToArtwork(event, document) {
var point = Events.getOffset(event);
// TODO: always the active view?
return document.activeView.viewToArtwork(point);
};
return {
beans: true,
initialize: function(handlers, doc) {
this.base(handlers);
// Create events once, so they can be removed easily too.
var that = this, curPoint;
var dragging = false;
this.events = {
mousedown: function(event) {
curPoint = viewToArtwork(event, that._document);
that.onHandleEvent('mouse-down', curPoint, null, null);
if (that.onMouseDown)
that._document.redraw();
if (that.eventInterval != null) {
this.timer = setInterval(that.events.mousemove,
that.eventInterval);
}
dragging = true;
},
mousemove: function(event) {
var point = event && viewToArtwork(event, that._document);
if (dragging) {
curPoint = point || curPoint;
if (curPoint) {
that.onHandleEvent('mouse-drag', curPoint, null, null);
if (that.onMouseDrag)
that._document.redraw();
}
} else {
that.onHandleEvent('mouse-move', point, null, null);
if (that.onMouseMove)
that._document.redraw();
}
},
mouseup: function(event) {
if (dragging) {
curPoint = null;
if (this.eventInterval != null)
clearInterval(this.timer);
that.onHandleEvent('mouse-up',
viewToArtwork(event, that._document), null, null);
if (that.onMouseUp)
that._document.redraw();
dragging = false;
}
}
}
if (paper.document)
this.setDocument(paper.document);
},
getDocument: function() {
return this._document;
},
setDocument: function(doc) {
// Remove old events first.
if (this._document)
Events.remove(this._document.canvas, this.events);
this._document = doc || paper.document;
Events.add(doc.canvas, this.events);
},
/**
* The fixed time delay between each call to the {@link #onMouseDrag}
* event. Setting this to an interval means the {@link #onMouseDrag}
* event is called repeatedly after the initial {@link #onMouseDown}
* until the user releases the mouse.
*
* Sample code:
* <code>
* // Fire the onMouseDrag event once a second,
* // while the mouse button is down
* tool.eventInterval = 1000;
* </code>
*
* @return the interval time in milliseconds
*/
eventInterval: null
};
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});