79 lines
2.5 KiB
JavaScript
79 lines
2.5 KiB
JavaScript
goog.provide('ol.event.Drag');
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goog.require('ol.event.ISequence');
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goog.require('ol.event');
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goog.require('goog.fx.Dragger');
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goog.require('goog.fx.DragEvent');
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goog.require('goog.fx.Dragger.EventType');
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/**
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* Event sequence that provides a 'dragstart', 'drag' and 'dragend' events.
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* Event objects of the 'drag' events have 'deltaX' and 'deltaY' values with
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* the relative pixel movement since the previous 'drag' or 'dragstart' event.
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*
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* @constructor
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* @param {ol.event.Events} target The Events instance that handles events.
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* @implements {ol.event.ISequence}
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* @export
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*/
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ol.event.Drag = function(target) {
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var previousX = 0, previousY = 0,
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element = target.getElement(),
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dragger = new goog.fx.Dragger(element);
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/**
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* @private
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* @type {goog.fx.Dragger}
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*/
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this.dragger_ = dragger;
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// We want to swallow the click event that gets fired after dragging.
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var stopClickRegistered = false;
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function stopClick() {
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target.unregister('click', stopClick, undefined, true);
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stopClickRegistered = false;
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return false;
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}
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dragger.defaultAction = function(x, y) {};
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dragger.addEventListener(goog.fx.Dragger.EventType.START, function(evt) {
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evt.target = element;
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evt.type = 'dragstart';
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previousX = evt.clientX;
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previousY = evt.clientY;
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target.triggerEvent(evt.type, evt);
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});
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dragger.addEventListener(goog.fx.Dragger.EventType.DRAG, function(evt) {
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evt.target = element;
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evt.deltaX = evt.clientX - previousX;
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evt.deltaY = evt.clientY - previousY;
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previousX = evt.clientX;
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previousY = evt.clientY;
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if (!stopClickRegistered) {
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// Once we are in the drag sequence, we know that we need to
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// get rid of the click event that gets fired when we are done
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// dragging.
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target.register('click', stopClick, undefined, true);
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stopClickRegistered = true;
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}
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target.triggerEvent(evt.type, evt);
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});
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dragger.addEventListener(goog.fx.Dragger.EventType.END, function(evt) {
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evt.target = element;
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evt.type = 'dragend';
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target.triggerEvent(evt.type, evt);
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});
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// Don't swallow the click event if our sequence cancels early.
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dragger.addEventListener(
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goog.fx.Dragger.EventType.EARLY_CANCEL, stopClick
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);
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};
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/** @inheritDoc */
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ol.event.Drag.prototype.destroy = function() {
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this.dragger_.dispose();
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};
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ol.event.addSequenceProvider('drag', ol.event.Drag); |