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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Events.js
*/
/**
* Class: OpenLayers.Events.buttonclick
* Extension event type for handling buttons on top of a dom element. This
* event type fires "buttonclick" on its <target> when a button was
* clicked. Buttons are detected by the "olButton" class.
*
* This event type makes sure that button clicks do not interfere with other
* events that are registered on the same <element>.
*
* Event types provided by this extension:
* - *buttonclick* Triggered when a button is clicked. Listeners receive an
* object with a *buttonElement* property referencing the dom element of
* the clicked button, and an *buttonXY* property with the click position
* relative to the button.
*/
OpenLayers.Events.buttonclick = OpenLayers.Class({
/**
* Property: target
* {<OpenLayers.Events>} The events instance that the buttonclick event will
* be triggered on.
*/
target: null,
/**
* Property: events
* {Array} Events to observe and conditionally stop from propagating when
* an element with the olButton class (or its olAlphaImg child) is
* clicked.
*/
events: [
'mousedown', 'mouseup', 'click', 'dblclick',
'touchstart', 'touchmove', 'touchend', 'keydown'
],
/**
* Property: startRegEx
* {RegExp} Regular expression to test Event.type for events that start
* a buttonclick sequence.
*/
startRegEx: /^mousedown|touchstart$/,
/**
* Property: cancelRegEx
* {RegExp} Regular expression to test Event.type for events that cancel
* a buttonclick sequence.
*/
cancelRegEx: /^touchmove$/,
/**
* Property: completeRegEx
* {RegExp} Regular expression to test Event.type for events that complete
* a buttonclick sequence.
*/
completeRegEx: /^mouseup|touchend$/,
/**
* Property: startEvt
* {Event} The event that started the click sequence
*/
/**
* Constructor: OpenLayers.Events.buttonclick
* Construct a buttonclick event type. Applications are not supposed to
* create instances of this class - they are created on demand by
* <OpenLayers.Events> instances.
*
* Parameters:
* target - {<OpenLayers.Events>} The events instance that the buttonclick
* event will be triggered on.
*/
initialize: function(target) {
this.target = target;
for (var i=this.events.length-1; i>=0; --i) {
this.target.register(this.events[i], this, this.buttonClick, {
extension: true
});
}
},
/**
* Method: destroy
*/
destroy: function() {
for (var i=this.events.length-1; i>=0; --i) {
this.target.unregister(this.events[i], this, this.buttonClick);
}
delete this.target;
},
/**
* Method: getPressedButton
* Get the pressed button, if any. Returns undefined if no button
* was pressed.
*
* Arguments:
* element - {DOMElement} The event target.
*
* Returns:
* {DOMElement} The button element, or undefined.
*/
getPressedButton: function(element) {
var depth = 3, // limit the search depth
button;
do {
if(OpenLayers.Element.hasClass(element, "olButton")) {
// hit!
button = element;
break;
}
element = element.parentNode;
} while(--depth > 0 && element);
return button;
},
/**
* Method: ignore
* Check for event target elements that should be ignored by OpenLayers.
*
* Parameters:
* element - {DOMElement} The event target.
*/
ignore: function(element) {
var depth = 3,
ignore = false;
do {
if (element.nodeName.toLowerCase() === 'a') {
ignore = true;
break;
}
element = element.parentNode;
} while (--depth > 0 && element);
return ignore;
},
/**
* Method: buttonClick
* Check if a button was clicked, and fire the buttonclick event
*
* Parameters:
* evt - {Event}
*/
buttonClick: function(evt) {
var propagate = true,
element = OpenLayers.Event.element(evt);
if (element && (OpenLayers.Event.isLeftClick(evt) || !~evt.type.indexOf("mouse"))) {
// was a button pressed?
var button = this.getPressedButton(element);
if (button) {
if (evt.type === "keydown") {
switch (evt.keyCode) {
case OpenLayers.Event.KEY_RETURN:
case OpenLayers.Event.KEY_SPACE:
this.target.triggerEvent("buttonclick", {
buttonElement: button
});
OpenLayers.Event.stop(evt);
propagate = false;
break;
}
} else if (this.startEvt) {
if (this.completeRegEx.test(evt.type)) {
var pos = OpenLayers.Util.pagePosition(button);
var viewportElement = OpenLayers.Util.getViewportElement();
var scrollTop = window.pageYOffset || viewportElement.scrollTop;
var scrollLeft = window.pageXOffset || viewportElement.scrollLeft;
pos[0] = pos[0] - scrollLeft;
pos[1] = pos[1] - scrollTop;
this.target.triggerEvent("buttonclick", {
buttonElement: button,
buttonXY: {
x: this.startEvt.clientX - pos[0],
y: this.startEvt.clientY - pos[1]
}
});
}
if (this.cancelRegEx.test(evt.type)) {
delete this.startEvt;
}
OpenLayers.Event.stop(evt);
propagate = false;
}
if (this.startRegEx.test(evt.type)) {
this.startEvt = evt;
OpenLayers.Event.stop(evt);
propagate = false;
}
} else {
propagate = !this.ignore(OpenLayers.Event.element(evt));
delete this.startEvt;
}
}
return propagate;
}
});