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dragpaninteraction.js
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dragpaninteraction.js
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goog.provide('ol.interaction.DragPan');
goog.require('goog.asserts');
goog.require('ol.Kinetic');
goog.require('ol.Pixel');
goog.require('ol.PreRenderFunction');
goog.require('ol.ViewHint');
goog.require('ol.coordinate');
goog.require('ol.events.condition');
goog.require('ol.interaction.Pointer');
/**
* @classdesc
* Allows the user to pan the map by dragging the map.
*
* @constructor
* @extends {ol.interaction.Pointer}
* @param {olx.interaction.DragPanOptions=} opt_options Options.
* @api stable
*/
ol.interaction.DragPan = function(opt_options) {
goog.base(this, {
handleDownEvent: ol.interaction.DragPan.handleDownEvent_,
handleDragEvent: ol.interaction.DragPan.handleDragEvent_,
handleUpEvent: ol.interaction.DragPan.handleUpEvent_
});
var options = goog.isDef(opt_options) ? opt_options : {};
/**
* @private
* @type {ol.Kinetic|undefined}
*/
this.kinetic_ = options.kinetic;
/**
* @private
* @type {?ol.PreRenderFunction}
*/
this.kineticPreRenderFn_ = null;
/**
* @type {ol.Pixel}
*/
this.lastCentroid = null;
/**
* @private
* @type {ol.events.ConditionType}
*/
this.condition_ = goog.isDef(options.condition) ?
options.condition : ol.events.condition.noModifierKeys;
/**
* @private
* @type {boolean}
*/
this.noKinetic_ = false;
};
goog.inherits(ol.interaction.DragPan, ol.interaction.Pointer);
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @this {ol.interaction.DragPan}
* @private
*/
ol.interaction.DragPan.handleDragEvent_ = function(mapBrowserEvent) {
goog.asserts.assert(this.targetPointers.length >= 1,
'the length of this.targetPointers should be more than 1');
var centroid =
ol.interaction.Pointer.centroid(this.targetPointers);
if (this.kinetic_) {
this.kinetic_.update(centroid[0], centroid[1]);
}
if (!goog.isNull(this.lastCentroid)) {
var deltaX = this.lastCentroid[0] - centroid[0];
var deltaY = centroid[1] - this.lastCentroid[1];
var map = mapBrowserEvent.map;
var view = map.getView();
var viewState = view.getState();
var center = [deltaX, deltaY];
ol.coordinate.scale(center, viewState.resolution);
ol.coordinate.rotate(center, viewState.rotation);
ol.coordinate.add(center, viewState.center);
center = view.constrainCenter(center);
map.render();
view.setCenter(center);
}
this.lastCentroid = centroid;
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Stop drag sequence?
* @this {ol.interaction.DragPan}
* @private
*/
ol.interaction.DragPan.handleUpEvent_ = function(mapBrowserEvent) {
var map = mapBrowserEvent.map;
var view = map.getView();
if (this.targetPointers.length === 0) {
if (!this.noKinetic_ && this.kinetic_ && this.kinetic_.end()) {
var distance = this.kinetic_.getDistance();
var angle = this.kinetic_.getAngle();
var center = view.getCenter();
goog.asserts.assert(goog.isDef(center), 'center should be defined');
this.kineticPreRenderFn_ = this.kinetic_.pan(center);
map.beforeRender(this.kineticPreRenderFn_);
var centerpx = map.getPixelFromCoordinate(center);
var dest = map.getCoordinateFromPixel([
centerpx[0] - distance * Math.cos(angle),
centerpx[1] - distance * Math.sin(angle)
]);
dest = view.constrainCenter(dest);
view.setCenter(dest);
}
view.setHint(ol.ViewHint.INTERACTING, -1);
map.render();
return false;
} else {
this.lastCentroid = null;
return true;
}
};
/**
* @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
* @return {boolean} Start drag sequence?
* @this {ol.interaction.DragPan}
* @private
*/
ol.interaction.DragPan.handleDownEvent_ = function(mapBrowserEvent) {
if (this.targetPointers.length > 0 && this.condition_(mapBrowserEvent)) {
var map = mapBrowserEvent.map;
var view = map.getView();
this.lastCentroid = null;
if (!this.handlingDownUpSequence) {
view.setHint(ol.ViewHint.INTERACTING, 1);
}
map.render();
if (!goog.isNull(this.kineticPreRenderFn_) &&
map.removePreRenderFunction(this.kineticPreRenderFn_)) {
view.setCenter(mapBrowserEvent.frameState.viewState.center);
this.kineticPreRenderFn_ = null;
}
if (this.kinetic_) {
this.kinetic_.begin();
}
// No kinetic as soon as more than one pointer on the screen is
// detected. This is to prevent nasty pans after pinch.
this.noKinetic_ = this.targetPointers.length > 1;
return true;
} else {
return false;
}
};
/**
* @inheritDoc
*/
ol.interaction.DragPan.prototype.shouldStopEvent = goog.functions.FALSE;