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manage preventDefaultAction flag inside the canvas-drag viewer event. Trigger the canvas-drag event before default drag happens on the viewer

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This commit is contained in:
kinto 2017-03-15 09:51:44 +01:00
parent 199e960d22
commit 741745433d
1 changed files with 25 additions and 23 deletions
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48
src/viewer.js
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@ -2532,20 +2532,16 @@ function onCanvasDblClick( event ) {
function onCanvasDrag( event ) {
var gestureSettings;
if ( !event.preventDefaultAction && this.viewport ) {
gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
if( !this.panHorizontal ){
event.delta.x = 0;
}
if( !this.panVertical ){
event.delta.y = 0;
}
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
if( this.constrainDuringPan ){
this.viewport.applyConstraints();
}
}
var canvasDragEventArgs = {
tracker: event.eventSource,
position: event.position,
delta: event.delta,
speed: event.speed,
direction: event.direction,
shift: event.shift,
originalEvent: event.originalEvent,
preventDefaultAction: event.preventDefaultAction
};
/**
* Raised when a mouse or touch drag operation occurs on the {@link OpenSeadragon.Viewer#canvas} element.
*
@ -2560,17 +2556,23 @@ function onCanvasDrag( event ) {
* @property {Number} direction - Current computed direction, expressed as an angle counterclockwise relative to the positive X axis (-pi to pi, in radians). Only valid if speed > 0.
* @property {Boolean} shift - True if the shift key was pressed during this event.
* @property {Object} originalEvent - The original DOM event.
* @property {Boolean} preventDefaultAction - Set to true to prevent default drag behaviour. Default: false.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
this.raiseEvent( 'canvas-drag', {
tracker: event.eventSource,
position: event.position,
delta: event.delta,
speed: event.speed,
direction: event.direction,
shift: event.shift,
originalEvent: event.originalEvent
});
this.raiseEvent( 'canvas-drag', canvasDragEventArgs);
if ( !canvasDragEventArgs.preventDefaultAction && this.viewport ) {
gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
if( !this.panHorizontal ){
event.delta.x = 0;
}
if( !this.panVertical ){
event.delta.y = 0;
}
this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
if( this.constrainDuringPan ){
this.viewport.applyConstraints();
}
}
}
function onCanvasDragEnd( event ) {