Proyectos de Subversion Moodle

// 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);

        };

    });

};