egroupware/api/js/webodf/collab/widgets/zoomSlider.js

94 lines
3.2 KiB
JavaScript

/**
* Copyright (C) 2012-2013 KO GmbH <copyright@kogmbh.com>
*
* @licstart
* This file is part of WebODF.
*
* WebODF is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License (GNU AGPL)
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* WebODF is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with WebODF. If not, see <http://www.gnu.org/licenses/>.
* @licend
*
* @source: http://www.webodf.org/
* @source: https://github.com/kogmbh/WebODF/
*/
/*global define, require, gui*/
webodfModule.define("webodf/editor/widgets/zoomSlider", [
"dijit/form/HorizontalSlider"],
function (HorizontalSlider) {
"use strict";
// The slider zooms from -1 to +1, which corresponds
// to zoom levels of 1/extremeZoomFactor to extremeZoomFactor.
return function ZoomSlider(callback) {
var self = this,
editorSession,
slider,
extremeZoomFactor = 4;
function updateSlider(zoomLevel) {
slider.set('value', Math.log(zoomLevel) / Math.log(extremeZoomFactor), false);
}
this.setEditorSession = function (session) {
var zoomHelper;
if (editorSession) {
editorSession.getOdfCanvas().getZoomHelper().unsubscribe(gui.ZoomHelper.signalZoomChanged, updateSlider);
}
editorSession = session;
if (editorSession) {
zoomHelper = editorSession.getOdfCanvas().getZoomHelper();
zoomHelper.subscribe(gui.ZoomHelper.signalZoomChanged, updateSlider);
updateSlider(zoomHelper.getZoomLevel());
}
slider.setAttribute('disabled', !editorSession);
};
/*jslint emptyblock: true*/
this.onToolDone = function () {};
/*jslint emptyblock: false*/
// init
function init() {
slider = new HorizontalSlider({
name: 'zoomSlider',
disabled: true,
value: 0,
minimum: -1,
maximum: 1,
discreteValues: 0.01,
intermediateChanges: true,
style: {
width: '150px',
height: '25px',
float: 'right'
}
});
slider.onChange = function (value) {
if (editorSession) {
editorSession.getOdfCanvas().getZoomHelper().setZoomLevel(Math.pow(extremeZoomFactor, value));
}
self.onToolDone();
};
return callback(slider);
}
init();
};
});