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Viewing changes to plasma/generic/scriptengines/webkit/dashboard/AppleClasses/AppleScrollArea.js

  • Committer: Bazaar Package Importer
  • Author(s): Michał Zając
  • Date: 2011-07-09 08:31:15 UTC
  • Revision ID: james.westby@ubuntu.com-20110709083115-ohyxn6z93mily9fc
Tags: upstream-4.6.90
Import upstream version 4.6.90

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plasma/generic/scriptengines/webkit/dashboard/AppleClasses/AppleScrollArea.js
 
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/*
 
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 * Copyright 2008 Stefan Buller <hikingpete@cain.afraid.org>
 
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 *
 
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 * This library is free software; you can redistribute it and/or
 
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 * modify it under the terms of the GNU Lesser General Public
 
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 * License as published by the Free Software Foundation; either
 
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 * version 2.1 of the License, or (at your option) version 3, or any
 
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 * later version accepted by the membership of KDE e.V. (or its
 
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 * successor approved by the membership of KDE e.V.), which shall
 
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 * act as a proxy defined in Section 6 of version 3 of the license.
 
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 *
 
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 * This library is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 
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 * Lesser General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU Lesser General Public 
 
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 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
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 */
 
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function AppleScrollArea(content) {
 
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        for (var i = 0; i < arguments.length; i++) {
 
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                this.addScrollbar(arguments[i]);
 
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        }
 
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        var that=this;
 
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        var handler=function(e) {
 
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                switch(e.which) {
 
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                        case 37: //left
 
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                                that.horizontalScrollTo(that.content.scrollLeft -
 
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                                                that.singlepressScrollPixels);
 
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                                break;
 
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                        case 38: //up
 
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                                that.verticalScrollTo(that.content.scrollTop -
 
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                                                that.singlepressScrollPixels);
 
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                                break;
 
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                        case 39: //right
 
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                                that.horizontalScrollTo(that.content.scrollLeft +
 
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                                                that.singlepressScrollPixels);
 
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                                break;
 
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                        case 40: //down
 
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                                that.verticalScrollTo(that.content.scrollTop +
 
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                                                that.singlepressScrollPixels);
 
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                                break;
 
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                        default:
 
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                                //the event may contiue to propagate
 
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                                return true;
 
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                }
 
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                //arrest propagation
 
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                return false;
 
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        }
 
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        content.addEventListener('keydown',handler,false);
 
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        //Apple mandated properties that must be reacted to.
 
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        this.scrollsVertically = false;
 
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        this.scrollsHorizontally = false;
 
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        this.singlepressScrollPixels = 10; //Somebody change this. Please.
 
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        //Apple mandated properties that are `read only'.
 
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        this.viewHeight = content.clientHeight;
 
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        this.viewToContentHeightRatio = content.clientHeight / content.scrollHeight;
 
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        this.viewWidth = content.clientWidth;
 
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        this.viewToContentWidthRatio = content.clientWidth / content.scrollWidth;
 
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        //I'm worried that the scrollHeight/Width could change on me. If that turns
 
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        //out to be a problem, then getters would be the way to go.
 
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        //extras
 
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        this.scrollbars = [];
 
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        this.content = content;
 
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}
 
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AppleScrollArea.prototype.addScrollbar = function(scrollbar) {
 
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        this.scrollbars.push(scrollbar);
 
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        scrollbar.setScrollArea(this);
 
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}
 
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AppleScrollArea.prototype.removeScrollbar = function(scrollbar) {
 
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        this.scrollbars.filter(function(element){return (element === scrollbar);});
 
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        scrollbar.setScrollArea(null); //Just a guess. This might not be right.
 
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}
 
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AppleScrollArea.prototype.remove = function() {
 
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        //Remove the div, or remove the effects of AppleScrollArea?
 
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        //Perhaps this can all be replaced with a simple removeChild()
 
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        content.scrollTop = 0;
 
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        content.scrollLeft = 0;
 
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        for (var i = 0; i < this.scrollbars.length; i++) {
 
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                this.scrollbars[i].remove();
 
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                delete this.scrollbars[i];
 
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        }
 
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        delete this;
 
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}
 
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AppleScrollArea.prototype.reveal = function(element) {
 
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        //First we find it
 
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        var distX = 0;
 
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        var distY = 0;
 
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        var el = element;
 
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        while (el !== this.content) {
 
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                distX += (+el.offsetTop);
 
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                distY += (+el.offsetLeft);
 
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                el = el.parentNode;
 
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                if (el == null) {
 
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                        throw "Target element not in ScrollArea.";
 
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                }
 
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        }
 
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        this.verticalScrollTo(distY);
 
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        this.horizontalScrollTo(distX);
 
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}
 
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AppleScrollArea.prototype.focus = function() {
 
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        this.content.focus();
 
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}
 
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AppleScrollArea.prototype.blur = function() {
 
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        this.content.blur();
 
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}
 
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AppleScrollArea.prototype.verticalScrollTo = function(position) {
 
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        this.scrollTop = position;
 
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}
 
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AppleScrollArea.prototype.horizontalScrollTo = function(position) {
 
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        this.scrollLeft = position;
 
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}
 
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