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client.js
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73 lines (55 loc) · 1.65 KB
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// Copyright (c) 2012 Titanium I.T. LLC. All rights reserved. See LICENSE.txt for details.
/*global Raphael */
window.wwp = window.wwp || {};
(function() {
"use strict";
var svgCanvas = null;
var start = null;
var drawingArea;
wwp.initializeDrawingArea = function(htmlElement) {
if (svgCanvas !== null) throw new Error("Client.js is not re-entrant");
drawingArea = htmlElement;
svgCanvas = new wwp.SvgCanvas(drawingArea);
handleDragEvents();
return svgCanvas;
};
wwp.drawingAreaHasBeenRemovedFromDom = function() {
svgCanvas = null;
};
function handleDragEvents() {
preventDefaults();
drawingArea.onMouseDown(startDrag);
drawingArea.onMouseMove(continueDrag);
drawingArea.onMouseLeave(endDrag);
drawingArea.onMouseUp(endDrag);
drawingArea.onSingleTouchStart(startDrag);
drawingArea.onSingleTouchMove(continueDrag);
drawingArea.onSingleTouchEnd(endDrag);
drawingArea.onSingleTouchCancel(endDrag);
drawingArea.onMultiTouchStart(endDrag);
}
function preventDefaults() {
drawingArea.onSelectStart_ie8Only(function(relativeOffset, event) {
// This event handler is needed so IE 8 doesn't select text when you drag outside drawing area
event.preventDefault();
});
drawingArea.onMouseDown(function(relativeOffset, event) {
event.preventDefault();
});
drawingArea.onSingleTouchStart(function(relativeOffset, event) {
event.preventDefault();
});
}
function startDrag(offset) {
start = offset;
}
function continueDrag(relativeOffset) {
if (start === null) return;
var end = relativeOffset;
svgCanvas.drawLine(start.x, start.y, end.x, end.y);
start = end;
}
function endDrag() {
start = null;
}
}());