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touchslide-puredom.js
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touchslide-puredom.js
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puredom.addNodeSelectionPlugin('touchslide', function(dragFactor, updateInterval, deadZone) {
dragFactor = dragFactor || 0.75;
updateInterval = updateInterval || 10;
deadZone = deadZone || 0.1;
var selected = puredom(this),
start = null,
previous = null,
current = null,
timeout = null,
on_move,
on_stop,
on_stop_before_move,
on_inertia;
function delta(e) {
return {
pageX: e.pageX,
pageY: e.pageY,
deltaX: e.pageX - previous.pageX,
deltaY: e.pageY - previous.pageY,
sourceOffsetX: e.pageX - start.pageX,
sourceOffsetY: e.pageY - start.pageY
};
}
function clear(){
puredom(window)
.removeEvent('mouseup', on_stop)
.removeEvent('mouseup', on_stop_before_move)
.removeEvent('mousemove', on_move);
}
function reset(){
if (timeout != null) {
clearTimeout(timeout);
timeout = null;
}
previous = current = start = null;
}
// Handles dragging the node selection.
on_move = function(e) {
previous = current;
if (previous === null) {
previous = start;
selected.fireEvent('slidestart');
puredom(window)
.removeEvent('mouseup', on_stop_before_move)
.on('mouseup', on_stop);
}
current = e;
selected.fireEvent('sliding', delta(e));
};
// Handles continuing movement of the node selection after release.
on_inertia = function(ne) {
ne.deltaX *= dragFactor;
ne.deltaY *= dragFactor;
ne.pageX += ne.deltaX;
ne.pageY += ne.deltaY;
ne.sourceOffsetX = ne.pageX - start.pageX;
ne.sourceOffsetY = ne.pageY - start.pageY;
selected.fireEvent('sliding', ne);
if (Math.abs(ne.deltaX) > deadZone ||
Math.abs(ne.deltaY) > deadZone) {
timeout = setTimeout(function(){on_inertia(ne);}, updateInterval);
}
else {
selected.fireEvent('slidestop');
reset();
}
};
// Handles release of the node selection after there has been movement.
on_stop = function(e) {
if (previous !== null) {
on_inertia(delta(e));
}
else {
selected.fireEvent('slidestop');
}
clear();
};
// Handles release of the node selection when no movement has occurred.
on_stop_before_move = function(e) {
clear();
};
// Handles touch/click of node selection.
// Attaches movement handler.
// Does NOT trigger slidestart yet.
function begin (e){
// 1 = left-click
// 0 = touch event
if (e.which > 1) {
return;
}
if (start !== null) {
selected.fireEvent('slidecancel');
}
reset();
clear();
start = e;
puredom(window)
.on('mousemove', on_move)
.on('mouseup', on_stop_before_move);
return e.cancel();
};
selected.on('mousedown', begin);
});