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import {Map} from '../Map';
import {Handler} from '../../core/Handler';
import * as Util from '../../core/Util';
import * as DomUtil from '../../dom/DomUtil';
import * as DomEvent from '../../dom/DomEvent';
import {LatLngBounds} from '../../geo/LatLngBounds';
import {Bounds} from '../../geometry/Bounds';
/*
* L.Handler.BoxZoom is used to add shift-drag zoom interaction to the map
* (zoom to a selected bounding box), enabled by default.
*/
// @namespace Map
// @section Interaction Options
Map.mergeOptions({
// @option boxZoom: Boolean = true
// Whether the map can be zoomed to a rectangular area specified by
// dragging the mouse while pressing the shift key.
boxZoom: true
});
export var BoxZoom = Handler.extend({
initialize: function (map) {
this._map = map;
this._container = map._container;
this._pane = map._panes.overlayPane;
this._resetStateTimeout = 0;
map.on('unload', this._destroy, this);
},
addHooks: function () {
DomEvent.on(this._container, 'mousedown', this._onMouseDown, this);
},
removeHooks: function () {
DomEvent.off(this._container, 'mousedown', this._onMouseDown, this);
},
moved: function () {
return this._moved;
},
_destroy: function () {
DomUtil.remove(this._pane);
delete this._pane;
},
_resetState: function () {
this._resetStateTimeout = 0;
this._moved = false;
},
_clearDeferredResetState: function () {
if (this._resetStateTimeout !== 0) {
clearTimeout(this._resetStateTimeout);
this._resetStateTimeout = 0;
}
},
_onMouseDown: function (e) {
if (!e.shiftKey || ((e.which !== 1) && (e.button !== 1))) { return false; }
// Clear the deferred resetState if it hasn't executed yet, otherwise it
// will interrupt the interaction and orphan a box element in the container.
this._clearDeferredResetState();
this._resetState();
DomUtil.disableTextSelection();
DomUtil.disableImageDrag();
this._startPoint = this._map.mouseEventToContainerPoint(e);
DomEvent.on(document, {
contextmenu: DomEvent.stop,
mousemove: this._onMouseMove,
mouseup: this._onMouseUp,
keydown: this._onKeyDown
}, this);
},
_onMouseMove: function (e) {
if (!this._moved) {
this._moved = true;
this._box = DomUtil.create('div', 'leaflet-zoom-box', this._container);
DomUtil.addClass(this._container, 'leaflet-crosshair');
this._map.fire('boxzoomstart');
}
this._point = this._map.mouseEventToContainerPoint(e);
var bounds = new Bounds(this._point, this._startPoint),
size = bounds.getSize();
DomUtil.setPosition(this._box, bounds.min);
this._box.style.width = size.x + 'px';
this._box.style.height = size.y + 'px';
},
_finish: function () {
if (this._moved) {
DomUtil.remove(this._box);
DomUtil.removeClass(this._container, 'leaflet-crosshair');
}
DomUtil.enableTextSelection();
DomUtil.enableImageDrag();
DomEvent.off(document, {
contextmenu: DomEvent.stop,
mousemove: this._onMouseMove,
mouseup: this._onMouseUp,
keydown: this._onKeyDown
}, this);
},
_onMouseUp: function (e) {
if ((e.which !== 1) && (e.button !== 1)) { return; }
this._finish();
if (!this._moved) { return; }
// Postpone to next JS tick so internal click event handling
// still see it as "moved".
this._clearDeferredResetState();
this._resetStateTimeout = setTimeout(Util.bind(this._resetState, this), 0);
var bounds = new LatLngBounds(
this._map.containerPointToLatLng(this._startPoint),
this._map.containerPointToLatLng(this._point));
this._map
.fitBounds(bounds)
.fire('boxzoomend', {boxZoomBounds: bounds});
},
_onKeyDown: function (e) {
if (e.keyCode === 27) {
this._finish();
}
}
});
// @section Handlers
// @property boxZoom: Handler
// Box (shift-drag with mouse) zoom handler.
Map.addInitHook('addHandler', 'boxZoom', BoxZoom);
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