    /**
     * @class Ext.QuickTips
     * <p>Provides attractive and customizable tooltips for any element. The QuickTips
     * singleton is used to configure and manage tooltips globally for multiple elements
     * in a generic manner.  To create individual tooltips with maximum customizability,
     * you should consider either {@link Ext.Tip} or {@link Ext.ToolTip}.</p>
     * <p>Quicktips can be configured via tag attributes directly in markup, or by
     * registering quick tips programmatically via the {@link #register} method.</p>
     * <p>The singleton's instance of {@link Ext.QuickTip} is available via
     * {@link #getQuickTip}, and supports all the methods, and all the all the
     * configuration properties of Ext.QuickTip. These settings will apply to all
     * tooltips shown by the singleton.</p>
     * <p>Below is the summary of the configuration properties which can be used.
     * For detailed descriptions see the config options for the {@link Ext.QuickTip QuickTip} class</p>
     * <p><b>QuickTips singleton configs (all are optional)</b></p>
     * <div class="mdetail-params"><ul><li>dismissDelay</li>
     * <li>hideDelay</li>
     * <li>maxWidth</li>
     * <li>minWidth</li>
     * <li>showDelay</li>
     * <li>trackMouse</li></ul></div>
     * <p><b>Target element configs (optional unless otherwise noted)</b></p>
     * <div class="mdetail-params"><ul><li>autoHide</li>
     * <li>cls</li>
     * <li>dismissDelay (overrides singleton value)</li>
     * <li>target (required)</li>
     * <li>text (required)</li>
     * <li>title</li>
     * <li>width</li></ul></div>
     * <p>Here is an example showing how some of these config options could be used:</p>
     * <pre><code>
    // Init the singleton.  Any tag-based quick tips will start working.
    Ext.QuickTips.init();

    // Apply a set of config properties to the singleton
    Ext.apply(Ext.QuickTips.getQuickTip(), {
        maxWidth: 200,
        minWidth: 100,
        showDelay: 50,      // Show 50ms after entering target
        trackMouse: true
    });

    // Manually register a quick tip for a specific element
    Ext.QuickTips.register({
        target: 'my-div',
        title: 'My Tooltip',
        text: 'This tooltip was added in code',
        width: 100,
        dismissDelay: 10000 // Hide after 10 seconds hover
    });
    </code></pre>
     * <p>To register a quick tip in markup, you simply add one or more of the valid QuickTip attributes prefixed with
     * the <b>ext:</b> namespace.  The HTML element itself is automatically set as the quick tip target. Here is the summary
     * of supported attributes (optional unless otherwise noted):</p>
     * <ul><li><b>hide</b>: Specifying "user" is equivalent to setting autoHide = false.  Any other value will be the
     * same as autoHide = true.</li>
     * <li><b>qclass</b>: A CSS class to be applied to the quick tip (equivalent to the 'cls' target element config).</li>
     * <li><b>qtip (required)</b>: The quick tip text (equivalent to the 'text' target element config).</li>
     * <li><b>qtitle</b>: The quick tip title (equivalent to the 'title' target element config).</li>
     * <li><b>qwidth</b>: The quick tip width (equivalent to the 'width' target element config).</li></ul>
     * <p>Here is an example of configuring an HTML element to display a tooltip from markup:</p>
     * <pre><code>
    // Add a quick tip to an HTML button
    &lt;input type="button" value="OK" ext:qtitle="OK Button" ext:qwidth="100"
         ext:qtip="This is a quick tip from markup!">&lt;/input>
    </code></pre>
     * @singleton
     */
    Ext.QuickTips = function(){
        var tip,
            disabled = false;

        return {
            /**
             * Initialize the global QuickTips instance and prepare any quick tips.
             * @param {Boolean} autoRender True to render the QuickTips container immediately to preload images. (Defaults to true)
             */
            init : function(autoRender){
                if(!tip){
                    if(!Ext.isReady){
                        Ext.onReady(function(){
                            Ext.QuickTips.init(autoRender);
                        });
                        return;
                    }
                    tip = new Ext.QuickTip({
                        elements:'header,body',
                        disabled: disabled
                    });
                    if(autoRender !== false){
                        tip.render(Ext.getBody());
                    }
                }
            },

            // Protected method called by the dd classes
            ddDisable : function(){
                // don't disable it if we don't need to
                if(tip && !disabled){
                    tip.disable();
                }
            },

            // Protected method called by the dd classes
            ddEnable : function(){
                // only enable it if it hasn't been disabled
                if(tip && !disabled){
                    tip.enable();
                }
            },

            /**
             * Enable quick tips globally.
             */
            enable : function(){
                if(tip){
                    tip.enable();
                }
                disabled = false;
            },

            /**
             * Disable quick tips globally.
             */
            disable : function(){
                if(tip){
                    tip.disable();
                }
                disabled = true;
            },

            /**
             * Returns true if quick tips are enabled, else false.
             * @return {Boolean}
             */
            isEnabled : function(){
                return tip !== undefined && !tip.disabled;
            },

            /**
             * Gets the single {@link Ext.QuickTip QuickTip} instance used to show tips from all registered elements.
             * @return {Ext.QuickTip}
             */
            getQuickTip : function(){
                return tip;
            },

            /**
             * Configures a new quick tip instance and assigns it to a target element.  See
             * {@link Ext.QuickTip#register} for details.
             * @param {Object} config The config object
             */
            register : function(){
                tip.register.apply(tip, arguments);
            },

            /**
             * Removes any registered quick tip from the target element and destroys it.
             * @param {String/HTMLElement/Element} el The element from which the quick tip is to be removed.
             */
            unregister : function(){
                tip.unregister.apply(tip, arguments);
            },

            /**
             * Alias of {@link #register}.
             * @param {Object} config The config object
             */
            tips : function(){
                tip.register.apply(tip, arguments);
            }
        };
    }();