97 lines
2.2 KiB
JavaScript
97 lines
2.2 KiB
JavaScript
// FIXME draw drag box
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// FIXME works for View2D only
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goog.provide('ol.interaction.DragZoom');
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goog.require('goog.asserts');
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goog.require('ol.Size');
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goog.require('ol.View2D');
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goog.require('ol.control.DragBox');
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goog.require('ol.extent');
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goog.require('ol.interaction.ConditionType');
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goog.require('ol.interaction.Drag');
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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 *
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ol.SHIFT_DRAG_ZOOM_HYSTERESIS_PIXELS;
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/**
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* @constructor
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* @extends {ol.interaction.Drag}
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* @param {ol.interaction.ConditionType} condition Condition.
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*/
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ol.interaction.DragZoom = function(condition) {
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goog.base(this);
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/**
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* @private
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* @type {ol.interaction.ConditionType}
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*/
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this.condition_ = condition;
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/**
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* @type {ol.control.DragBox}
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* @private
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*/
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this.dragBox_ = null;
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};
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goog.inherits(ol.interaction.DragZoom, ol.interaction.Drag);
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/**
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* @inheritDoc
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*/
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ol.interaction.DragZoom.prototype.handleDragEnd =
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function(mapBrowserEvent) {
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this.dragBox_.setMap(null);
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this.dragBox_ = null;
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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, mapBrowserEvent.getCoordinate()]);
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map.withFrozenRendering(function() {
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// FIXME works for View2D only
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var view = map.getView();
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goog.asserts.assertInstanceof(view, ol.View2D);
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var mapSize = /** @type {ol.Size} */ (map.getSize());
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view.fitExtent(extent, mapSize);
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// FIXME we should preserve rotation
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view.setRotation(0);
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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.interaction.DragZoom.prototype.handleDragStart =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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if (browserEvent.isMouseActionButton() && this.condition_(browserEvent)) {
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this.dragBox_ = new ol.control.DragBox({
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map: mapBrowserEvent.map,
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startCoordinate: this.startCoordinate
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});
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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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