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manage preventDefaultAction flag in canvas-double-click viewer event

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Trigger the canvas-double-click event before default double tap to zoom happens on the viewer
This commit is contained in:
Oeystein Lygre 2017-08-21 22:38:44 +02:00
parent 36dd37b931
commit d1ea179296
2 changed files with 94 additions and 16 deletions
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37
src/viewer.js
View File

@ -2611,16 +2611,14 @@ function onCanvasClick( event ) {
function onCanvasDblClick( event ) {
var gestureSettings;
if ( !event.preventDefaultAction && this.viewport ) {
gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
if ( gestureSettings.dblClickToZoom ) {
this.viewport.zoomBy(
event.shift ? 1.0 / this.zoomPerClick : this.zoomPerClick,
this.viewport.pointFromPixel( event.position, true )
);
this.viewport.applyConstraints();
}
}
var canvasDblClickEventArgs = {
tracker: event.eventSource,
position: event.position,
shift: event.shift,
originalEvent: event.originalEvent,
preventDefaultAction: event.preventDefaultAction
};
/**
* Raised when a double mouse press/release or touch/remove occurs on the {@link OpenSeadragon.Viewer#canvas} element.
*
@ -2632,14 +2630,21 @@ function onCanvasDblClick( event ) {
* @property {OpenSeadragon.Point} position - The position of the event relative to the tracked element.
* @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 double tap to zoom behaviour. Default: false.
* @property {?Object} userData - Arbitrary subscriber-defined object.
*/
this.raiseEvent( 'canvas-double-click', {
tracker: event.eventSource,
position: event.position,
shift: event.shift,
originalEvent: event.originalEvent
});
this.raiseEvent( 'canvas-double-click', canvasDblClickEventArgs);
if ( !canvasDblClickEventArgs.preventDefaultAction && this.viewport ) {
gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
if ( gestureSettings.dblClickToZoom ) {
this.viewport.zoomBy(
event.shift ? 1.0 / this.zoomPerClick : this.zoomPerClick,
this.viewport.pointFromPixel( event.position, true )
);
this.viewport.applyConstraints();
}
}
}
function onCanvasDrag( event ) {

73
test/modules/events.js
View File

@ -833,6 +833,79 @@
viewer.open('/test/data/testpattern.dzi');
});
// ----------
asyncTest('Viewer: preventDefaultAction in dblClickHandler', function() {
var tracker = viewer.innerTracker;
var epsilon = 0.0000001;
function simulateDblTap() {
var touches = [];
TouchUtil.reset();
touches.push(TouchUtil.start([0,0]));
TouchUtil.end( touches[0] );
touches.push(TouchUtil.start([0,0]));
TouchUtil.end( touches[1] );
}
var onOpen = function() {
viewer.removeHandler('open', onOpen);
var originalZoom = viewer.viewport.getZoom();
var origDblClickHandler = tracker.dblClickHandler;
tracker.dblClickHandler = function(event) {
event.preventDefaultAction = true;
return origDblClickHandler(event);
};
TouchUtil.initTracker(tracker);
simulateDblTap();
var zoom = viewer.viewport.getZoom();
Util.assessNumericValue(originalZoom, zoom, epsilon,
"Zoom on double tap should be prevented");
// Reset event handler to original
tracker.dblClickHandler = origDblClickHandler;
simulateDblTap();
originalZoom = originalZoom * viewer.zoomPerClick;
var zoom = viewer.viewport.getZoom();
Util.assessNumericValue(originalZoom, zoom, epsilon,
"Zoom on double tap should not be prevented");
var dblClickHandler = function(event) {
event.preventDefaultAction = true;
}
viewer.addHandler('canvas-double-click', dblClickHandler);
var zoom = viewer.viewport.getZoom();
Util.assessNumericValue(originalZoom, zoom, epsilon,
"Zoom on double tap should be prevented");
// Remove custom event handler
viewer.removeHandler('canvas-double-click', dblClickHandler);
simulateDblTap();
originalZoom = originalZoom * viewer.zoomPerClick;
var zoom = viewer.viewport.getZoom();
Util.assessNumericValue(originalZoom, zoom, epsilon,
"Zoom on double tap should not be prevented");
TouchUtil.resetTracker(tracker);
viewer.close();
start();
};
viewer.addHandler('open', onOpen);
viewer.open('/test/data/testpattern.dzi');
});
// ----------
asyncTest( 'EventSource/MouseTracker/Viewer: event.originalEvent event.userData canvas-drag canvas-drag-end canvas-release canvas-click', function () {
var $canvas = $( viewer.element ).find( '.openseadragon-canvas' ).not( '.navigator .openseadragon-canvas' ),