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<a href="../../index.html">all files</a> / <a href="index.html">ol/interaction/</a> pointerinteraction.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">goog.provide('ol.interaction.Pointer');
goog.require('goog.functions');
goog.require('goog.object');
goog.require('ol');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.MapBrowserPointerEvent');
goog.require('ol.Pixel');
goog.require('ol.interaction.Interaction');
/**
* @classdesc
* Base class that calls user-defined functions on `down`, `move` and `up`
* events. This class also manages "drag sequences".
*
* When the `handleDownEvent` user function returns `true` a drag sequence is
* started. During a drag sequence the `handleDragEvent` user function is
* called on `move` events. The drag sequence ends when the `handleUpEvent`
* user function is called and returns `false`.
*
* @constructor
* @param {olx.interaction.PointerOptions=} opt_options Options.
* @extends {ol.interaction.Interaction}
* @api
*/
ol.interaction.Pointer = function(opt_options) {
var options = opt_options ? opt_options : <span class="branch-1 cbranch-no" title="branch not covered" >{};</span>
var handleEvent = options.handleEvent ?
options.handleEvent : ol.interaction.Pointer.handleEvent;
goog.base(this, {
handleEvent: handleEvent
});
/**
* @type {function(ol.MapBrowserPointerEvent):boolean}
* @private
*/
this.handleDownEvent_ = options.handleDownEvent ?
options.handleDownEvent : <span class="branch-1 cbranch-no" title="branch not covered" >ol.interaction.Pointer.handleDownEvent;</span>
/**
* @type {function(ol.MapBrowserPointerEvent)}
* @private
*/
this.handleDragEvent_ = options.handleDragEvent ?
options.handleDragEvent : ol.interaction.Pointer.handleDragEvent;
/**
* @type {function(ol.MapBrowserPointerEvent)}
* @private
*/
this.handleMoveEvent_ = options.handleMoveEvent ?
options.handleMoveEvent : ol.interaction.Pointer.handleMoveEvent;
/**
* @type {function(ol.MapBrowserPointerEvent):boolean}
* @private
*/
this.handleUpEvent_ = options.handleUpEvent ?
options.handleUpEvent : <span class="branch-1 cbranch-no" title="branch not covered" >ol.interaction.Pointer.handleUpEvent;</span>
/**
* @type {boolean}
* @protected
*/
this.handlingDownUpSequence = false;
/**
* @type {Object.<number, ol.pointer.PointerEvent>}
* @private
*/
this.trackedPointers_ = {};
/**
* @type {Array.<ol.pointer.PointerEvent>}
* @protected
*/
this.targetPointers = [];
};
goog.inherits(ol.interaction.Pointer, ol.interaction.Interaction);
/**
* @param {Array.<ol.pointer.PointerEvent>} pointerEvents
* @return {ol.Pixel} Centroid pixel.
*/
ol.interaction.Pointer.centroid = function(pointerEvents) {
var length = pointerEvents.length;
var clientX = 0;
var clientY = 0;
for (var i = 0; i < length; i++) {
clientX += pointerEvents[i].clientX;
clientY += pointerEvents[i].clientY;
}
return [clientX / length, clientY / length];
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Whether the event is a pointerdown, pointerdrag
* or pointerup event.
* @private
*/
ol.interaction.Pointer.prototype.isPointerDraggingEvent_ =
function(mapBrowserEvent) {
var type = mapBrowserEvent.type;
return (
type === ol.MapBrowserEvent.EventType.POINTERDOWN ||
type === ol.MapBrowserEvent.EventType.POINTERDRAG ||
type === ol.MapBrowserEvent.EventType.POINTERUP);
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @private
*/
ol.interaction.Pointer.prototype.updateTrackedPointers_ =
function(mapBrowserEvent) {
if (this.isPointerDraggingEvent_(mapBrowserEvent)) {
var event = mapBrowserEvent.pointerEvent;
if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
delete this.trackedPointers_[event.pointerId];
} else if (mapBrowserEvent.type ==
ol.MapBrowserEvent.EventType.POINTERDOWN) {
this.trackedPointers_[event.pointerId] = event;
} else if (event.pointerId in this.trackedPointers_) {
// update only when there was a pointerdown event for this pointer
this.trackedPointers_[event.pointerId] = event;
}
this.targetPointers = goog.object.getValues(this.trackedPointers_);
}
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @this {ol.interaction.Pointer}
*/
ol.interaction.Pointer.handleDragEvent = ol.nullFunction;
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Capture dragging.
* @this {ol.interaction.Pointer}
*/
ol.interaction.Pointer.handleUpEvent = goog.functions.FALSE;
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Capture dragging.
* @this {ol.interaction.Pointer}
*/
ol.interaction.Pointer.handleDownEvent = goog.functions.FALSE;
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @this {ol.interaction.Pointer}
*/
ol.interaction.Pointer.handleMoveEvent = ol.nullFunction;
/**
* Handles the {@link ol.MapBrowserEvent map browser event} and may call into
* other functions, if event sequences like e.g. 'drag' or 'down-up' etc. are
* detected.
* @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
* @return {boolean} `false` to stop event propagation.
* @this {ol.interaction.Pointer}
* @api
*/
ol.interaction.Pointer.handleEvent = function(mapBrowserEvent) {
if (!(mapBrowserEvent instanceof ol.MapBrowserPointerEvent)) {
return true;
}
var stopEvent = false;
this.updateTrackedPointers_(mapBrowserEvent);
if (this.handlingDownUpSequence) {
if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDRAG) {
this.handleDragEvent_(mapBrowserEvent);
} else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
this.handlingDownUpSequence = this.handleUpEvent_(mapBrowserEvent);
}
}
if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDOWN) {
var handled = this.handleDownEvent_(mapBrowserEvent);
this.handlingDownUpSequence = handled;
stopEvent = this.shouldStopEvent(handled);
} else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERMOVE) {
this.handleMoveEvent_(mapBrowserEvent);
}
return !stopEvent;
};
/**
* This method is used to determine if "down" events should be propagated to
* other interactions or should be stopped.
*
* The method receives the return code of the "handleDownEvent" function.
*
* By default this function is the "identity" function. It's overidden in
* child classes.
*
* @param {boolean} handled Was the event handled by the interaction?
* @return {boolean} Should the event be stopped?
* @protected
*/
ol.interaction.Pointer.prototype.shouldStopEvent = goog.functions.identity;
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