71 lines
2.1 KiB
JavaScript
71 lines
2.1 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.interaction.KeyboardPan');
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goog.require('goog.events.KeyCodes');
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goog.require('goog.events.KeyHandler.EventType');
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goog.require('ol.Coordinate');
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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} pixelDelta Pixel delta.
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*/
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ol.interaction.KeyboardPan = function(pixelDelta) {
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goog.base(this);
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/**
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* @private
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* @type {number}
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*/
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this.pixelDelta_ = pixelDelta;
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};
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goog.inherits(ol.interaction.KeyboardPan, ol.interaction.Interaction);
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/**
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* @inheritDoc
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*/
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ol.interaction.KeyboardPan.prototype.handleMapBrowserEvent =
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function(mapBrowserEvent) {
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if (mapBrowserEvent.type == goog.events.KeyHandler.EventType.KEY) {
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var keyEvent = /** @type {goog.events.KeyEvent} */
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(mapBrowserEvent.browserEvent);
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var keyCode = keyEvent.keyCode;
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if (keyCode == goog.events.KeyCodes.DOWN ||
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keyCode == goog.events.KeyCodes.LEFT ||
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keyCode == goog.events.KeyCodes.RIGHT ||
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keyCode == goog.events.KeyCodes.UP) {
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var map = mapBrowserEvent.map;
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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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var resolution = view.getResolution();
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var delta;
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var mapUnitsDelta = resolution * this.pixelDelta_;
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if (keyCode == goog.events.KeyCodes.DOWN) {
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delta = new ol.Coordinate(0, -mapUnitsDelta);
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} else if (keyCode == goog.events.KeyCodes.LEFT) {
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delta = new ol.Coordinate(-mapUnitsDelta, 0);
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} else if (keyCode == goog.events.KeyCodes.RIGHT) {
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delta = new ol.Coordinate(mapUnitsDelta, 0);
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} else {
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goog.asserts.assert(keyCode == goog.events.KeyCodes.UP);
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delta = new ol.Coordinate(0, mapUnitsDelta);
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}
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var oldCenter = view.getCenter();
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var newCenter = new ol.Coordinate(
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oldCenter.x + delta.x, oldCenter.y + delta.y);
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view.setCenter(newCenter);
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keyEvent.preventDefault();
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mapBrowserEvent.preventDefault();
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}
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}
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};
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