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prevent unnecessary panBy on canvas-drag in viewer

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jonw-cogapp 2017-04-21 18:19:11 +01:00
parent be382a47b6
commit ab6cdf102e
1 changed files with 3 additions and 1 deletions
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4
src/viewer.js
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@ -2573,7 +2573,9 @@ function onCanvasDrag( event ) {
if( !this.panVertical ){ if( !this.panVertical ){
event.delta.y = 0; event.delta.y = 0;
} }
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled ); if( event.delta.x !== 0 || event.delta.y !== 0){
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
}
if( this.constrainDuringPan ){ if( this.constrainDuringPan ){
this.viewport.applyConstraints(); this.viewport.applyConstraints();
} }