51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.interaction.MouseWheelZoom');
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goog.require('goog.events.MouseWheelEvent');
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goog.require('goog.events.MouseWheelHandler.EventType');
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goog.require('ol.View2D');
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goog.require('ol.interaction.Interaction');
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/**
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* @constructor
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* @extends {ol.interaction.Interaction}
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* @param {number} delta The zoom delta applied on each mousewheel.
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*/
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ol.interaction.MouseWheelZoom = function(delta) {
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/**
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* @private
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* @type {number}
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*/
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this.delta_ = delta;
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goog.base(this);
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};
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goog.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);
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/**
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* @inheritDoc
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*/
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ol.interaction.MouseWheelZoom.prototype.handleMapBrowserEvent =
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function(mapBrowserEvent) {
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if (mapBrowserEvent.type ==
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goog.events.MouseWheelHandler.EventType.MOUSEWHEEL) {
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var map = mapBrowserEvent.map;
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var mouseWheelEvent = /** @type {goog.events.MouseWheelEvent} */
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(mapBrowserEvent.browserEvent);
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goog.asserts.assert(mouseWheelEvent instanceof goog.events.MouseWheelEvent);
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var anchor = mapBrowserEvent.getCoordinate();
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var delta = mouseWheelEvent.deltaY < 0 ? this.delta_ : -this.delta_;
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// FIXME works for View2D only
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var view = map.getView();
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goog.asserts.assert(view instanceof ol.View2D);
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map.requestRenderFrame();
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view.zoom(map, delta, anchor);
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mapBrowserEvent.preventDefault();
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mouseWheelEvent.preventDefault();
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}
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};
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