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keyboardzoominteraction.js
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keyboardzoominteraction.js
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// FIXME works for View2D only
goog.provide('ol.interaction.KeyboardZoom');
goog.require('goog.events.KeyCodes');
goog.require('goog.events.KeyHandler.EventType');
goog.require('ol.View2D');
goog.require('ol.interaction.Interaction');
/**
* @define {number} Zoom duration.
*/
ol.interaction.KEYBOARD_ZOOM_DURATION = 100;
/**
* @constructor
* @extends {ol.interaction.Interaction}
*/
ol.interaction.KeyboardZoom = function() {
goog.base(this);
};
goog.inherits(ol.interaction.KeyboardZoom, ol.interaction.Interaction);
/**
* @inheritDoc
*/
ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
function(mapBrowserEvent) {
if (mapBrowserEvent.type == goog.events.KeyHandler.EventType.KEY) {
var keyEvent = /** @type {goog.events.KeyEvent} */
(mapBrowserEvent.browserEvent);
var charCode = keyEvent.charCode;
if (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0)) {
var map = mapBrowserEvent.map;
var delta = (charCode == '+'.charCodeAt(0)) ? 4 : -4;
map.requestRenderFrame();
// FIXME works for View2D only
var view = map.getView();
goog.asserts.assert(view instanceof ol.View2D);
view.zoom(map, delta, undefined, ol.interaction.KEYBOARD_ZOOM_DURATION);
keyEvent.preventDefault();
mapBrowserEvent.preventDefault();
}
}
};