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Merge pull request #1171 from superbland/canvas-drag-optimisation

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prevent unnecessary panBy on canvas-drag in viewer
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Ian Gilman 2017-04-25 09:38:13 -07:00 committed by GitHub
commit 80611e999a
1 changed files with 5 additions and 3 deletions
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8
src/viewer.js
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@ -2573,9 +2573,11 @@ function onCanvasDrag( event ) {
if( !this.panVertical ){
event.delta.y = 0;
}
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
if( this.constrainDuringPan ){
this.viewport.applyConstraints();
if( event.delta.x !== 0 || event.delta.y !== 0 ){
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
if( this.constrainDuringPan ){
this.viewport.applyConstraints();
}
}
}
}