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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/**
+* mouse_event_shim.js: generate mouse events from touch events.
+*
+* This library listens for touch events and generates mousedown, mousemove
+* mouseup, and click events to match them. It captures and dicards any
+* real mouse events (non-synthetic events with isTrusted true) that are
+* send by gecko so that there are not duplicates.
+*
+* This library does emit mouseover/mouseout and mouseenter/mouseleave
+* events. You can turn them off by setting MouseEventShim.trackMouseMoves to
+* false. This means that mousemove events will always have the same target
+* as the mousedown even that began the series. You can also call
+* MouseEventShim.setCapture() from a mousedown event handler to prevent
+* mouse tracking until the next mouseup event.
+*
+* This library does not support multi-touch but should be sufficient
+* to do drags based on mousedown/mousemove/mouseup events.
+*
+* This library does not emit dblclick events or contextmenu events
+*/
+
+'use strict';
+
+(function() {
+ // Make sure we don't run more than once
+ if (MouseEventShim)
+ return;
+
+ // Bail if we're not on running on a platform that sends touch
+ // events. We don't need the shim code for mouse events.
+ try {
+ document.createEvent('TouchEvent');
+ } catch (e) {
+ return;
+ }
+
+ var starttouch; // The Touch object that we started with
+ var target; // The element the touch is currently over
+ var emitclick; // Will we be sending a click event after mouseup?
+
+ // Use capturing listeners to discard all mouse events from gecko
+ window.addEventListener('mousedown', discardEvent, true);
+ window.addEventListener('mouseup', discardEvent, true);
+ window.addEventListener('mousemove', discardEvent, true);
+ window.addEventListener('click', discardEvent, true);
+
+ function discardEvent(e) {
+ if (e.isTrusted) {
+ e.stopImmediatePropagation(); // so it goes no further
+ if (e.type === 'click')
+ e.preventDefault(); // so it doesn't trigger a change event
+ }
+ }
+
+ // Listen for touch events that bubble up to the window.
+ // If other code has called stopPropagation on the touch events
+ // then we'll never see them. Also, we'll honor the defaultPrevented
+ // state of the event and will not generate synthetic mouse events
+ window.addEventListener('touchstart', handleTouchStart);
+ window.addEventListener('touchmove', handleTouchMove);
+ window.addEventListener('touchend', handleTouchEnd);
+ window.addEventListener('touchcancel', handleTouchEnd); // Same as touchend
+
+ function handleTouchStart(e) {
+ // If we're already handling a touch, ignore this one
+ if (starttouch)
+ return;
+
+ // Ignore any event that has already been prevented
+ if (e.defaultPrevented)
+ return;
+
+ // Sometimes an unknown gecko bug causes us to get a touchstart event
+ // for an iframe target that we can't use because it is cross origin.
+ // Don't start handling a touch in that case
+ try {
+ e.changedTouches[0].target.ownerDocument;
+ }
+ catch (e) {
+ // Ignore the event if we can't see the properties of the target
+ return;
+ }
+
+ // If there is more than one simultaneous touch, ignore all but the first
+ starttouch = e.changedTouches[0];
+ target = starttouch.target;
+ emitclick = true;
+
+ // Move to the position of the touch
+ emitEvent('mousemove', target, starttouch);
+
+ // Now send a synthetic mousedown
+ var result = emitEvent('mousedown', target, starttouch);
+
+ // If the mousedown was prevented, pass that on to the touch event.
+ // And remember not to send a click event
+ if (!result) {
+ e.preventDefault();
+ emitclick = false;
+ }
+ }
+
+ function handleTouchEnd(e) {
+ if (!starttouch)
+ return;
+
+ // End a MouseEventShim.setCapture() call
+ if (MouseEventShim.capturing) {
+ MouseEventShim.capturing = false;
+ MouseEventShim.captureTarget = null;
+ }
+
+ for (var i = 0; i < e.changedTouches.length; i++) {
+ var touch = e.changedTouches[i];
+ // If the ended touch does not have the same id, skip it
+ if (touch.identifier !== starttouch.identifier)
+ continue;
+
+ emitEvent('mouseup', target, touch);
+
+ // If target is still the same element we started and the touch did not
+ // move more than the threshold and if the user did not prevent
+ // the mousedown, then send a click event, too.
+ if (emitclick)
+ emitEvent('click', starttouch.target, touch);
+
+ starttouch = null;
+ return;
+ }
+ }
+
+ function handleTouchMove(e) {
+ if (!starttouch)
+ return;
+
+ for (var i = 0; i < e.changedTouches.length; i++) {
+ var touch = e.changedTouches[i];
+ // If the ended touch does not have the same id, skip it
+ if (touch.identifier !== starttouch.identifier)
+ continue;
+
+ // Don't send a mousemove if the touchmove was prevented
+ if (e.defaultPrevented)
+ return;
+
+ // See if we've moved too much to emit a click event
+ var dx = Math.abs(touch.screenX - starttouch.screenX);
+ var dy = Math.abs(touch.screenY - starttouch.screenY);
+ if (dx > MouseEventShim.dragThresholdX ||
+ dy > MouseEventShim.dragThresholdY) {
+ emitclick = false;
+ }
+
+ var tracking = MouseEventShim.trackMouseMoves &&
+ !MouseEventShim.capturing;
+
+ if (tracking) {
+ // If the touch point moves, then the element it is over
+ // may have changed as well. Note that calling elementFromPoint()
+ // forces a layout if one is needed.
+ // XXX: how expensive is it to do this on each touchmove?
+ // Can we listen for (non-standard) touchleave events instead?
+ var oldtarget = target;
+ var newtarget = document.elementFromPoint(touch.clientX, touch.clientY);
+ if (newtarget === null) {
+ // this can happen as the touch is moving off of the screen, e.g.
+ newtarget = oldtarget;
+ }
+ if (newtarget !== oldtarget) {
+ leave(oldtarget, newtarget, touch); // mouseout, mouseleave
+ target = newtarget;
+ }
+ }
+ else if (MouseEventShim.captureTarget) {
+ target = MouseEventShim.captureTarget;
+ }
+
+ emitEvent('mousemove', target, touch);
+
+ if (tracking && newtarget !== oldtarget) {
+ enter(newtarget, oldtarget, touch); // mouseover, mouseenter
+ }
+ }
+ }
+
+ // Return true if element a contains element b
+ function contains(a, b) {
+ return (a.compareDocumentPosition(b) & 16) !== 0;
+ }
+
+ // A touch has left oldtarget and entered newtarget
+ // Send out all the events that are required
+ function leave(oldtarget, newtarget, touch) {
+ emitEvent('mouseout', oldtarget, touch, newtarget);
+
+ // If the touch has actually left oldtarget (and has not just moved
+ // into a child of oldtarget) send a mouseleave event. mouseleave
+ // events don't bubble, so we have to repeat this up the hierarchy.
+ for (var e = oldtarget; !contains(e, newtarget); e = e.parentNode) {
+ emitEvent('mouseleave', e, touch, newtarget);
+ }
+ }
+
+ // A touch has entered newtarget from oldtarget
+ // Send out all the events that are required.
+ function enter(newtarget, oldtarget, touch) {
+ emitEvent('mouseover', newtarget, touch, oldtarget);
+
+ // Emit non-bubbling mouseenter events if the touch actually entered
+ // newtarget and wasn't already in some child of it
+ for (var e = newtarget; !contains(e, oldtarget); e = e.parentNode) {
+ emitEvent('mouseenter', e, touch, oldtarget);
+ }
+ }
+
+ function emitEvent(type, target, touch, relatedTarget) {
+ var synthetic = document.createEvent('MouseEvents');
+ var bubbles = (type !== 'mouseenter' && type !== 'mouseleave');
+ var count =
+ (type === 'mousedown' || type === 'mouseup' || type === 'click') ? 1 : 0;
+
+ synthetic.initMouseEvent(type,
+ bubbles, // canBubble
+ true, // cancelable
+ window,
+ count, // detail: click count
+ touch.screenX,
+ touch.screenY,
+ touch.clientX,
+ touch.clientY,
+ false, // ctrlKey: we don't have one
+ false, // altKey: we don't have one
+ false, // shiftKey: we don't have one
+ false, // metaKey: we don't have one
+ 0, // we're simulating the left button
+ relatedTarget || null);
+
+ try {
+ return target.dispatchEvent(synthetic);
+ }
+ catch (e) {
+ console.warn('Exception calling dispatchEvent', type, e);
+ return true;
+ }
+ }
+}());
+
+var MouseEventShim = {
+ // It is a known gecko bug that synthetic events have timestamps measured
+ // in microseconds while regular events have timestamps measured in
+ // milliseconds. This utility function returns a the timestamp converted
+ // to milliseconds, if necessary.
+ getEventTimestamp: function(e) {
+ if (e.isTrusted) // XXX: Are real events always trusted?
+ return e.timeStamp;
+ else
+ return e.timeStamp / 1000;
+ },
+
+ // Set this to false if you don't care about mouseover/out events
+ // and don't want the target of mousemove events to follow the touch
+ trackMouseMoves: true,
+
+ // Call this function from a mousedown event handler if you want to guarantee
+ // that the mousemove and mouseup events will go to the same element
+ // as the mousedown even if they leave the bounds of the element. This is
+ // like setting trackMouseMoves to false for just one drag. It is a
+ // substitute for event.target.setCapture(true)
+ setCapture: function(target) {
+ this.capturing = true; // Will be set back to false on mouseup
+ if (target)
+ this.captureTarget = target;
+ },
+
+ capturing: false,
+
+ // Keep these in sync with ui.dragThresholdX and ui.dragThresholdY prefs.
+ // If a touch ever moves more than this many pixels from its starting point
+ // then we will not synthesize a click event when the touch ends.
+ dragThresholdX: 25,
+ dragThresholdY: 25
+};