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// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Javascript helper function for IMS Content Package module.
*
* @package mod
* @subpackage imscp
* @copyright 2009 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
M.mod_imscp = {};
M.mod_imscp.init = function(Y) {
var imscp_layout_widget;
var imscp_current_node;
var imscp_buttons = [];
var imscp_bloody_labelclick = false;
Y.use('yui2-resize', 'yui2-dragdrop', 'yui2-container', 'yui2-button', 'yui2-layout', 'yui2-treeview', 'yui2-json', 'yui2-event', function(Y) {
var imscp_activate_item_by_index = function(index) {
imscp_activate_item(Y.YUI2.widget.TreeView.getNode('imscp_tree', index));
};
var imscp_activate_item = function(node) {
if (!node) {
return;
}
imscp_current_node = node;
imscp_current_node.highlight();
var content = new Y.YUI2.util.Element('imscp_content');
var obj;
if (node.href) {
try {
// First try IE way - it can not set name attribute later
// and also it has some restrictions on DOM access from object tag.
obj = document.createElement('<iframe id="imscp_object" src="' + node.href + '">');
} catch (e) {
obj = document.createElement('object');
obj.setAttribute('id', 'imscp_object');
obj.setAttribute('type', 'text/html');
obj.setAttribute('data', node.href);
}
} else {
// No href, so create links to children.
obj = document.createElement('div');
obj.setAttribute('id', 'imscp_child_list');
var title = document.createElement('h2');
title.appendChild(document.createTextNode(node.label));
title.setAttribute('class', 'sectionname');
obj.appendChild(title);
var ul = document.createElement('ul');
obj.appendChild(ul);
for (var i = 0; i < node.children.length; i++) {
var childnode = node.children[i];
var li = document.createElement('li');
var a = document.createElement('a');
a.appendChild(document.createTextNode(childnode.label));
a.setAttribute('id', 'ref_' + childnode.index);
Y.YUI2.util.Event.addListener(a, "click", function () {
imscp_activate_item_by_index(this.id.substr(4));
});
ul.appendChild(li);
li.appendChild(a);
}
}
var old = Y.YUI2.util.Dom.get('imscp_object');
if (old) {
content.replaceChild(obj, old);
} else {
old = Y.YUI2.util.Dom.get('imscp_child_list');
if (old) {
content.replaceChild(obj, old);
} else {
content.appendChild(obj);
}
}
imscp_resize_frame();
imscp_current_node.focus();
imscp_fixnav();
};
/**
* Enables/disables navigation buttons as needed.
* @return void
*/
var imscp_fixnav = function() {
imscp_buttons[0].set('disabled', (imscp_skipprev(imscp_current_node) == null));
imscp_buttons[1].set('disabled', (imscp_prev(imscp_current_node) == null));
imscp_buttons[2].set('disabled', (imscp_up(imscp_current_node) == null));
imscp_buttons[3].set('disabled', (imscp_next(imscp_current_node) == null));
imscp_buttons[4].set('disabled', (imscp_skipnext(imscp_current_node) == null));
};
var imscp_resize_layout = function(alsowidth) {
if (alsowidth) {
var layout = Y.YUI2.util.Dom.get('imscp_layout');
var newwidth = imscp_get_htmlelement_size('maincontent', 'width');
layout.style.width = '600px';
if (newwidth > 600) {
layout.style.width = newwidth + 'px';
}
}
// Make sure that the max width of the TOC doesn't go to far.
var left = imscp_layout_widget.getUnitByPosition('left');
var maxwidth = parseInt(Y.YUI2.util.Dom.getStyle('imscp_layout', 'width'));
left.set('maxWidth', (maxwidth - 10));
var cwidth = left.get('width');
if (cwidth > (maxwidth - 10)) {
left.set('width', (maxwidth - 10));
}
var headerheight = imscp_get_htmlelement_size('page-header', 'height');
var footerheight = imscp_get_htmlelement_size('page-footer', 'height');
var newheight = parseInt(Y.YUI2.util.Dom.getViewportHeight()) - footerheight - headerheight - 20;
if (newheight < 400) {
newheight = 400;
}
imscp_layout_widget.setStyle('height', newheight + 'px');
imscp_layout_widget.render();
imscp_resize_frame();
};
var imscp_get_htmlelement_size = function(el, prop) {
var val = Y.YUI2.util.Dom.getStyle(el, prop);
if (val == 'auto') {
if (el.get) {
el = el.get('element'); // Get real HTMLElement from YUI element.
}
val = Y.YUI2.util.Dom.getComputedStyle(Y.YUI2.util.Dom.get(el), prop);
}
return parseInt(val);
};
var imscp_resize_frame = function() {
obj = Y.YUI2.util.Dom.get('imscp_object');
if (obj) {
var content = imscp_layout_widget.getUnitByPosition('center').get('wrap');
// Basically trap IE6 and 7.
if (Y.YUI2.env.ua.ie > 5 && Y.YUI2.env.ua.ie < 8) {
if( obj.style.setAttribute ) {
obj.style.setAttribute("cssText", 'width: ' + (content.offsetWidth - 6) + 'px; height: ' + (content.offsetHeight - 10) + 'px;');
}
else {
obj.style.setAttribute('width', (content.offsetWidth - 6) + 'px', 0);
obj.style.setAttribute('height', (content.offsetHeight - 10) + 'px', 0);
}
}
else {
obj.style.width = (content.offsetWidth - 6) + 'px';
obj.style.height = (content.offsetHeight - 10) + 'px';
}
}
};
var imscp_firstlinked = function(node) {
// Return first item with an href.
if (node.href) {
return node;
} else if (node.children) {
return imscp_firstlinked(node.children[0]);
} else {
return null;
}
};
var imscp_up = function(node) {
if (node.depth > 0) {
return node.parent;
}
return null;
};
var imscp_lastchild = function(node) {
if (node.children.length) {
return imscp_lastchild(node.children[node.children.length - 1]);
} else {
return node;
}
};
var imscp_prev = function(node) {
if (node.previousSibling && node.previousSibling.children.length) {
return imscp_lastchild(node.previousSibling);
}
return imscp_skipprev(node);
};
var imscp_skipprev = function(node) {
if (node.previousSibling) {
return node.previousSibling;
} else if (node.depth > 0) {
return node.parent;
}
return null;
};
var imscp_next = function(node) {
if (node.children.length) {
return node.children[0];
}
return imscp_skipnext(node);
};
var imscp_skipnext = function(node) {
if (node.nextSibling) {
return node.nextSibling;
} else if (node.depth > 0) {
return imscp_skipnext(node.parent);
}
return null;
};
// Layout.
Y.YUI2.widget.LayoutUnit.prototype.STR_COLLAPSE = M.util.get_string('hide', 'moodle');
Y.YUI2.widget.LayoutUnit.prototype.STR_EXPAND = M.util.get_string('show', 'moodle');
imscp_layout_widget = new Y.YUI2.widget.Layout('imscp_layout', {
minWidth: 600,
minHeight: 400,
units: [
{ position: 'left', body: 'imscp_toc', header: M.util.get_string('toc', 'imscp'), width: 250, resize: true, gutter: '2px 5px 5px 2px', collapse: true, minWidth:150},
{ position: 'center', body: '<div id="imscp_content"></div>', gutter: '2px 5px 5px 2px', scroll: true}
]
});
imscp_layout_widget.render();
var left = imscp_layout_widget.getUnitByPosition('left');
left.on('collapse', function() {
imscp_resize_frame();
});
left.on('expand', function() {
imscp_resize_frame();
});
// Ugly resizing hack that works around problems with resizing of iframes and objects.
left._resize.on('startResize', function() {
obj = Y.YUI2.util.Dom.get('imscp_object');
obj.style.display = 'none';
});
left._resize.on('endResize', function() {
obj = Y.YUI2.util.Dom.get('imscp_object');
obj.style.display = 'block';
imscp_resize_frame();
});
// TOC tree.
var tree = new Y.YUI2.widget.TreeView('imscp_tree');
tree.singleNodeHighlight = true;
tree.subscribe('clickEvent', function(oArgs) {
imscp_activate_item(oArgs.node);
if (oArgs.node.children.length) {
imscp_bloody_labelclick = true;
}
Y.YUI2.util.Event.preventDefault(oArgs.event);
return false;
});
tree.subscribe('collapse', function(node) {
if (imscp_bloody_labelclick) {
imscp_bloody_labelclick = false;
return false;
}
});
tree.subscribe('expand', function(node) {
if (imscp_bloody_labelclick) {
imscp_bloody_labelclick = false;
return false;
}
});
tree.expandAll();
tree.render();
var navbar = Y.YUI2.util.Dom.get('imscp_nav');
navbar.style.display = 'block';
// Navigation.
imscp_buttons[0] = new Y.YUI2.widget.Button('nav_skipprev');
imscp_buttons[1] = new Y.YUI2.widget.Button('nav_prev');
imscp_buttons[2] = new Y.YUI2.widget.Button('nav_up');
imscp_buttons[3] = new Y.YUI2.widget.Button('nav_next');
imscp_buttons[4] = new Y.YUI2.widget.Button('nav_skipnext');
imscp_buttons[0].on('click', function(ev) {
imscp_activate_item(imscp_skipprev(imscp_current_node));
});
imscp_buttons[1].on('click', function(ev) {
imscp_activate_item(imscp_prev(imscp_current_node));
});
imscp_buttons[2].on('click', function(ev) {
imscp_activate_item(imscp_up(imscp_current_node));
});
imscp_buttons[3].on('click', function(ev) {
imscp_activate_item(imscp_next(imscp_current_node));
});
imscp_buttons[4].on('click', function(ev) {
imscp_activate_item(imscp_skipnext(imscp_current_node));
});
// Finally activate the first item.
imscp_activate_item(imscp_firstlinked(tree.getRoot().children[0]));
// Resizing.
imscp_resize_layout(false);
// Fix layout if window resized.
window.onresize = function() {
imscp_resize_layout(true);
};
});
};