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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/Control.js
* @requires OpenLayers/Handler/Keyboard.js
* @requires OpenLayers/Events.js
*/
/**
* Class: OpenLayers.Control.KeyboardDefaults
* The KeyboardDefaults control adds panning and zooming functions, controlled
* with the keyboard. By default arrow keys pan, +/- keys zoom & Page Up/Page
* Down/Home/End scroll by three quarters of a page.
*
* This control has no visible appearance.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.KeyboardDefaults = OpenLayers.Class(OpenLayers.Control, {
/**
* APIProperty: autoActivate
* {Boolean} Activate the control when it is added to a map. Default is
* true.
*/
autoActivate: true,
/**
* APIProperty: slideFactor
* Pixels to slide by.
*/
slideFactor: 75,
/**
* APIProperty: observeElement
* {DOMelement|String} The DOM element to handle keys for. You
* can use the map div here, to have the navigation keys
* work when the map div has the focus. If undefined the
* document is used.
*/
observeElement: null,
/**
* Constructor: OpenLayers.Control.KeyboardDefaults
*/
/**
* Method: draw
* Create handler.
*/
draw: function() {
var observeElement = this.observeElement || document;
this.handler = new OpenLayers.Handler.Keyboard( this,
{"keydown": this.defaultKeyPress},
{observeElement: observeElement}
);
},
/**
* Method: defaultKeyPress
* When handling the key event, we only use evt.keyCode. This holds
* some drawbacks, though we get around them below. When interpretting
* the keycodes below (including the comments associated with them),
* consult the URL below. For instance, the Safari browser returns
* "IE keycodes", and so is supported by any keycode labeled "IE".
*
* Very informative URL:
* http://unixpapa.com/js/key.html
*
* Parameters:
* evt - {Event}
*/
defaultKeyPress: function (evt) {
var size, handled = true;
var target = OpenLayers.Event.element(evt);
if (target &&
(target.tagName == 'INPUT' ||
target.tagName == 'TEXTAREA' ||
target.tagName == 'SELECT')) {
return;
}
switch (evt.keyCode) {
case OpenLayers.Event.KEY_LEFT:
this.map.pan(-this.slideFactor, 0);
break;
case OpenLayers.Event.KEY_RIGHT:
this.map.pan(this.slideFactor, 0);
break;
case OpenLayers.Event.KEY_UP:
this.map.pan(0, -this.slideFactor);
break;
case OpenLayers.Event.KEY_DOWN:
this.map.pan(0, this.slideFactor);
break;
case 33: // Page Up. Same in all browsers.
size = this.map.getSize();
this.map.pan(0, -0.75*size.h);
break;
case 34: // Page Down. Same in all browsers.
size = this.map.getSize();
this.map.pan(0, 0.75*size.h);
break;
case 35: // End. Same in all browsers.
size = this.map.getSize();
this.map.pan(0.75*size.w, 0);
break;
case 36: // Home. Same in all browsers.
size = this.map.getSize();
this.map.pan(-0.75*size.w, 0);
break;
case 43: // +/= (ASCII), keypad + (ASCII, Opera)
case 61: // +/= (Mozilla, Opera, some ASCII)
case 187: // +/= (IE)
case 107: // keypad + (IE, Mozilla)
this.map.zoomIn();
break;
case 45: // -/_ (ASCII, Opera), keypad - (ASCII, Opera)
case 109: // -/_ (Mozilla), keypad - (Mozilla, IE)
case 189: // -/_ (IE)
case 95: // -/_ (some ASCII)
this.map.zoomOut();
break;
default:
handled = false;
}
if (handled) {
// prevent browser default not to move the page
// when moving the page with the keyboard
OpenLayers.Event.stop(evt);
}
},
CLASS_NAME: "OpenLayers.Control.KeyboardDefaults"
});
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