66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
// FIXME draw drag box
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goog.provide('ol.interaction.ShiftDragZoom');
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goog.require('ol.Extent');
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goog.require('ol.MapBrowserEvent');
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goog.require('ol.interaction.Constraints');
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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.Constraints} constraints Constraints.
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*/
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ol.interaction.ShiftDragZoom = function(constraints) {
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goog.base(this, constraints);
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};
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goog.inherits(ol.interaction.ShiftDragZoom, ol.interaction.Drag);
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/**
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* @inheritDoc
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*/
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ol.interaction.ShiftDragZoom.prototype.handleDragEnd =
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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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this.fitExtent(map, extent);
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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.ShiftDragZoom.prototype.handleDragStart =
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function(mapBrowserEvent) {
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var browserEvent = mapBrowserEvent.browserEvent;
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if (browserEvent.isMouseActionButton() && 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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