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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Handler.js
* @requires OpenLayers/Handler/Drag.js
*/
/**
* Class: OpenLayers.Handler.Box
* Handler for dragging a rectangle across the map. Box is displayed
* on mouse down, moves on mouse move, and is finished on mouse up.
*
* Inherits from:
* - <OpenLayers.Handler>
*/
OpenLayers.Handler.Box = OpenLayers.Class(OpenLayers.Handler, {
/**
* Property: dragHandler
* {<OpenLayers.Handler.Drag>}
*/
dragHandler: null,
/**
* APIProperty: boxDivClassName
* {String} The CSS class to use for drawing the box. Default is
* olHandlerBoxZoomBox
*/
boxDivClassName: 'olHandlerBoxZoomBox',
/**
* Property: boxOffsets
* {Object} Caches box offsets from css. This is used by the getBoxOffsets
* method.
*/
boxOffsets: null,
/**
* Constructor: OpenLayers.Handler.Box
*
* Parameters:
* control - {<OpenLayers.Control>}
* callbacks - {Object} An object with a properties whose values are
* functions. Various callbacks described below.
* options - {Object}
*
* Named callbacks:
* start - Called when the box drag operation starts.
* done - Called when the box drag operation is finished.
* The callback should expect to receive a single argument, the box
* bounds or a pixel. If the box dragging didn't span more than a 5
* pixel distance, a pixel will be returned instead of a bounds object.
*/
initialize: function(control, callbacks, options) {
OpenLayers.Handler.prototype.initialize.apply(this, arguments);
this.dragHandler = new OpenLayers.Handler.Drag(
this,
{
down: this.startBox,
move: this.moveBox,
out: this.removeBox,
up: this.endBox
},
{keyMask: this.keyMask}
);
},
/**
* Method: destroy
*/
destroy: function() {
OpenLayers.Handler.prototype.destroy.apply(this, arguments);
if (this.dragHandler) {
this.dragHandler.destroy();
this.dragHandler = null;
}
},
/**
* Method: setMap
*/
setMap: function (map) {
OpenLayers.Handler.prototype.setMap.apply(this, arguments);
if (this.dragHandler) {
this.dragHandler.setMap(map);
}
},
/**
* Method: startBox
*
* Parameters:
* xy - {<OpenLayers.Pixel>}
*/
startBox: function (xy) {
this.callback("start", []);
this.zoomBox = OpenLayers.Util.createDiv('zoomBox', {
x: -9999, y: -9999
});
this.zoomBox.className = this.boxDivClassName;
this.zoomBox.style.zIndex = this.map.Z_INDEX_BASE["Popup"] - 1;
this.map.viewPortDiv.appendChild(this.zoomBox);
OpenLayers.Element.addClass(
this.map.viewPortDiv, "olDrawBox"
);
},
/**
* Method: moveBox
*/
moveBox: function (xy) {
var startX = this.dragHandler.start.x;
var startY = this.dragHandler.start.y;
var deltaX = Math.abs(startX - xy.x);
var deltaY = Math.abs(startY - xy.y);
var offset = this.getBoxOffsets();
this.zoomBox.style.width = (deltaX + offset.width + 1) + "px";
this.zoomBox.style.height = (deltaY + offset.height + 1) + "px";
this.zoomBox.style.left = (xy.x < startX ?
startX - deltaX - offset.left : startX - offset.left) + "px";
this.zoomBox.style.top = (xy.y < startY ?
startY - deltaY - offset.top : startY - offset.top) + "px";
},
/**
* Method: endBox
*/
endBox: function(end) {
var result;
if (Math.abs(this.dragHandler.start.x - end.x) > 5 ||
Math.abs(this.dragHandler.start.y - end.y) > 5) {
var start = this.dragHandler.start;
var top = Math.min(start.y, end.y);
var bottom = Math.max(start.y, end.y);
var left = Math.min(start.x, end.x);
var right = Math.max(start.x, end.x);
result = new OpenLayers.Bounds(left, bottom, right, top);
} else {
result = this.dragHandler.start.clone(); // i.e. OL.Pixel
}
this.removeBox();
this.callback("done", [result]);
},
/**
* Method: removeBox
* Remove the zoombox from the screen and nullify our reference to it.
*/
removeBox: function() {
this.map.viewPortDiv.removeChild(this.zoomBox);
this.zoomBox = null;
this.boxOffsets = null;
OpenLayers.Element.removeClass(
this.map.viewPortDiv, "olDrawBox"
);
},
/**
* Method: activate
*/
activate: function () {
if (OpenLayers.Handler.prototype.activate.apply(this, arguments)) {
this.dragHandler.activate();
return true;
} else {
return false;
}
},
/**
* Method: deactivate
*/
deactivate: function () {
if (OpenLayers.Handler.prototype.deactivate.apply(this, arguments)) {
if (this.dragHandler.deactivate()) {
if (this.zoomBox) {
this.removeBox();
}
}
return true;
} else {
return false;
}
},
/**
* Method: getBoxOffsets
* Determines border offsets for a box, according to the box model.
*
* Returns:
* {Object} an object with the following offsets:
* - left
* - right
* - top
* - bottom
* - width
* - height
*/
getBoxOffsets: function() {
if (!this.boxOffsets) {
// Determine the box model. If the testDiv's clientWidth is 3, then
// the borders are outside and we are dealing with the w3c box
// model. Otherwise, the browser uses the traditional box model and
// the borders are inside the box bounds, leaving us with a
// clientWidth of 1.
var testDiv = document.createElement("div");
//testDiv.style.visibility = "hidden";
testDiv.style.position = "absolute";
testDiv.style.border = "1px solid black";
testDiv.style.width = "3px";
document.body.appendChild(testDiv);
var w3cBoxModel = testDiv.clientWidth == 3;
document.body.removeChild(testDiv);
var left = parseInt(OpenLayers.Element.getStyle(this.zoomBox,
"border-left-width"));
var right = parseInt(OpenLayers.Element.getStyle(
this.zoomBox, "border-right-width"));
var top = parseInt(OpenLayers.Element.getStyle(this.zoomBox,
"border-top-width"));
var bottom = parseInt(OpenLayers.Element.getStyle(
this.zoomBox, "border-bottom-width"));
this.boxOffsets = {
left: left,
right: right,
top: top,
bottom: bottom,
width: w3cBoxModel === false ? left + right : 0,
height: w3cBoxModel === false ? top + bottom : 0
};
}
return this.boxOffsets;
},
CLASS_NAME: "OpenLayers.Handler.Box"
});
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