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Interaction: MSPointer: Optimize by ignoring MSPointerMove events with the same x/y coords as the previous event.

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Scott González 2012-01-11 22:31:39 -05:00
parent f09288d18f
commit 3ffb6c6a2e
1 changed files with 16 additions and 4 deletions
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20
ui/jquery.ui.interaction.js vendored
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@ -188,7 +188,9 @@ var pointerHook = interaction.hooks.msPointer = {
handle: function( widget ) { handle: function( widget ) {
function move( _event ) { function move( _event ) {
var event = _event.originalEvent; var event = _event.originalEvent,
pageX = event.pageX,
pageY = event.pageY;
// always prevent manipulation to avoid panning/zooming // always prevent manipulation to avoid panning/zooming
event.preventManipulation(); event.preventManipulation();
@ -197,9 +199,17 @@ var pointerHook = interaction.hooks.msPointer = {
return; return;
} }
// MS streams events constantly, even if there is no movement
// so we optimize by ignoring repeat events
if ( pointerHook.x === pageX && pointerHook.y === pageY ) {
return;
}
pointerHook.x = pageX;
pointerHook.y = pageY;
widget._interactionMove( event, { widget._interactionMove( event, {
left: event.pageX, left: pageX,
top: event.pageY top: pageY
}); });
} }
@ -214,7 +224,9 @@ var pointerHook = interaction.hooks.msPointer = {
left: event.pageX, left: event.pageX,
top: event.pageY top: event.pageY
}); });
pointerHook.id = null; pointerHook.id = undefined;
pointerHook.x = undefined;
pointerHook.y = undefined;
widget.document widget.document
.unbind( "MSPointerMove", move ) .unbind( "MSPointerMove", move )
.unbind( "MSPointerUp", stop ) .unbind( "MSPointerUp", stop )