I'm implementing an online drawing tool using GWT & HTML5. I have handled
mouse events successfully and I'm venturing in to handling touch events to
cover devices that only fire touch events. I have tried
com.google.gwt.event.dom.client.Touch*Events.
I do notice TouchStart, TouchMove, & TouchEnd events being fired. However,
when these events utilized (start drawing, continue drawing, finish
drawing; for e.g., a line) handling events become inconsistent. TouchStart
is always handled well but the other two, TouchMove and TouchEnd aren't
handled consistently. Given below is a segment of code.
drawingPaper.sinkEvents(Event.TOUCHEVENTS);
// Handle touch start
drawingPaper.addHandler(new TouchStartHandler() {
@Override
public void onTouchStart(TouchStartEvent event) {
startingPoint = PointerEventHelper.getUsableLocation(event, ...);
// no device specific code in the method below
handlePointerDownActionImpl(); /* Consistently getting called */
}
}, TouchStartEvent.getType());
// Handle touch move
drawingPaper.addHandler(new TouchMoveHandler() {
@Override
public void onTouchMove(TouchMoveEvent event) {
currentLocation = PointerEventHelper.getUsableLocation(event, ...);
// no device specific code in the method below
handlePointerMoveActionImpl(); /* Call to this is inconsistent */
}
}, TouchMoveEvent.getType());
I'm using browsers like Chrome, Firefox, Duck Duck Go, Bravo, Opera, and
Opera Mini on my Pixel 2 and Samsung Galaxy Tab A.
Any suggestions would be very much appreciated.
--
You received this message because you are subscribed to the Google Groups "GWT
Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to google-web-toolkit+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/google-web-toolkit/15c87eb4-acec-4c78-8870-406cdc63a5f9%40googlegroups.com.
