78 lines
1.7 KiB
JavaScript
78 lines
1.7 KiB
JavaScript
// FIXME draw drag box
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goog.provide('ol.control.ShiftDragZoom');
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goog.require('ol.Extent');
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goog.require('ol.MapBrowserEvent');
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goog.require('ol.control.Drag');
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goog.require('ol.control.ZoomFunctionType');
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/**
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* @define {number} Hysterisis pixels.
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*/
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ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS = 8;
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/**
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* @const {number}
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*/
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ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS_SQUARED =
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ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS * ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS;
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/**
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* @constructor
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* @extends {ol.control.Drag}
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* @param {ol.control.ZoomFunctionType=} opt_zoomFunction Zoom function.
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*/
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ol.control.ShiftDragZoom = function(opt_zoomFunction) {
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goog.base(this);
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/**
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* @private
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* @type {ol.control.ZoomFunctionType|undefined}
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*/
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this.zoomFunction_ = opt_zoomFunction;
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};
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goog.inherits(ol.control.ShiftDragZoom, ol.control.Drag);
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/**
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* @inheritDoc
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*/
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ol.control.ShiftDragZoom.prototype.handleDragEnd = function(mapBrowserEvent) {
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if (this.deltaX * this.deltaX + this.deltaY * this.deltaY >=
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ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS_SQUARED) {
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var map = mapBrowserEvent.map;
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var extent = ol.Extent.boundingExtent(
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this.startCoordinate,
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mapBrowserEvent.getCoordinate());
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var resolution = map.getResolutionForExtent(extent);
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if (goog.isDef(this.zoomFunction_)) {
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resolution = this.zoomFunction_(resolution, 0);
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}
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map.withFrozenRendering(function() {
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map.setCenter(extent.getCenter());
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map.setResolution(resolution);
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});
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}
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};
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/**
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* @inheritDoc
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*/
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ol.control.ShiftDragZoom.prototype.handleDragStart = function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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if (browserEvent.shiftKey) {
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browserEvent.preventDefault();
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return true;
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} else {
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return false;
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}
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};
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