/**
 * @docauthor Robert Dougan <rob@sencha.com>
 *
 * Create simple buttons with this component. Customisations include {@link #iconAlign aligned}
 * {@link #iconCls icons}, {@link #cfg-menu dropdown menus}, {@link #tooltip tooltips}
 * and {@link #scale sizing options}. Specify a {@link #handler handler} to run code when
 * a user clicks the button, or use {@link #listeners listeners} for other events such as
 * {@link #mouseover mouseover}. Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         text: 'Click me',
 *         renderTo: Ext.getBody(),
 *         handler: function() {
 *             alert('You clicked the button!');
 *         }
 *     });
 *
 * The {@link #handler} configuration can also be updated dynamically using the {@link #setHandler}
 * method.  Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         text    : 'Dynamic Handler Button',
 *         renderTo: Ext.getBody(),
 *         handler : function() {
 *             // this button will spit out a different number every time you click it.
 *             // so firstly we must check if that number is already set:
 *             if (this.clickCount) {
 *                 // looks like the property is already set, so lets just add 1 to that number and alert the user
 *                 this.clickCount++;
 *                 alert('You have clicked the button "' + this.clickCount + '" times.\n\nTry clicking it again..');
 *             } else {
 *                 // if the clickCount property is not set, we will set it and alert the user
 *                 this.clickCount = 1;
 *                 alert('You just clicked the button for the first time!\n\nTry pressing it again..');
 *             }
 *         }
 *     });
 *
 * A button within a container:
 *
 *     @example
 *     Ext.create('Ext.Container', {
 *         renderTo: Ext.getBody(),
 *         items   : [
 *             {
 *                 xtype: 'button',
 *                 text : 'My Button'
 *             }
 *         ]
 *     });
 *
 * A useful option of Button is the {@link #scale} configuration. This configuration has three different options:
 *
 * - `'small'`
 * - `'medium'`
 * - `'large'`
 *
 * Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         renderTo: document.body,
 *         text    : 'Click me',
 *         scale   : 'large'
 *     });
 *
 * Buttons can also be toggled. To enable this, you simple set the {@link #enableToggle} property to `true`.
 * Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         renderTo: Ext.getBody(),
 *         text: 'Click Me',
 *         enableToggle: true
 *     });
 *
 * You can assign a menu to a button by using the {@link #cfg-menu} configuration. This standard configuration
 * can either be a reference to a {@link Ext.menu.Menu menu} object, a {@link Ext.menu.Menu menu} id or a
 * {@link Ext.menu.Menu menu} config blob. When assigning a menu to a button, an arrow is automatically
 * added to the button.  You can change the alignment of the arrow using the {@link #arrowAlign} configuration
 * on button.  Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         text      : 'Menu button',
 *         renderTo  : Ext.getBody(),
 *         arrowAlign: 'bottom',
 *         menu      : [
 *             {text: 'Item 1'},
 *             {text: 'Item 2'},
 *             {text: 'Item 3'},
 *             {text: 'Item 4'}
 *         ]
 *     });
 *
 * Using listeners, you can easily listen to events fired by any component, using the {@link #listeners}
 * configuration or using the {@link #addListener} method.  Button has a variety of different listeners:
 *
 * - `click`
 * - `toggle`
 * - `mouseover`
 * - `mouseout`
 * - `mouseshow`
 * - `menuhide`
 * - `menutriggerover`
 * - `menutriggerout`
 *
 * Example usage:
 *
 *     @example
 *     Ext.create('Ext.Button', {
 *         text     : 'Button',
 *         renderTo : Ext.getBody(),
 *         listeners: {
 *             click: function() {
 *                 // this == the button, as we are in the local scope
 *                 this.setText('I was clicked!');
 *             },
 *             mouseover: function() {
 *                 // set a new config which says we moused over, if not already set
 *                 if (!this.mousedOver) {
 *                     this.mousedOver = true;
 *                     alert('You moused over a button!\n\nI wont do this again.');
 *                 }
 *             }
 *         }
 *     });
 */
Ext.define('Ext.button.Button', {

    /* Begin Definitions */
    alias: 'widget.button',
    extend: 'Ext.Component',

    requires: [
        'Ext.menu.Manager',
        'Ext.util.ClickRepeater',
        'Ext.layout.component.Button',
        'Ext.util.TextMetrics',
        'Ext.util.KeyMap'
    ],

    alternateClassName: 'Ext.Button',
    /* End Definitions */

    /*
     * @property {Boolean} isAction
     * `true` in this class to identify an object as an instantiated Button, or subclass thereof.
     */
    isButton: true,
    componentLayout: 'button',

    /**
     * @property {Boolean} hidden
     * True if this button is hidden.
     * @readonly
     */
    hidden: false,

    /**
     * @property {Boolean} disabled
     * True if this button is disabled.
     * @readonly
     */
    disabled: false,

    /**
     * @property {Boolean} pressed
     * True if this button is pressed (only if enableToggle = true).
     * @readonly
     */
    pressed: false,

    /**
     * @cfg {String} text
     * The button text to be used as innerHTML (html tags are accepted).
     */

    /**
     * @cfg {String} icon
     * The path to an image to display in the button.
     */

    /**
     * @cfg {Function} handler
     * A function called when the button is clicked (can be used instead of click event).
     * @cfg {Ext.button.Button} handler.button This button.
     * @cfg {Ext.EventObject} handler.e The click event.
     */

    /**
     * @cfg {Number} minWidth
     * The minimum width for this button (used to give a set of buttons a common width).
     * See also {@link Ext.panel.Panel}.{@link Ext.panel.Panel#minButtonWidth minButtonWidth}.
     */

    /**
     * @cfg {String/Object} tooltip
     * The tooltip for the button - can be a string to be used as innerHTML (html tags are accepted) or
     * QuickTips config object.
     */

    /**
     * @cfg {Boolean} [hidden=false]
     * True to start hidden.
     */

    /**
     * @cfg {Boolean} [disabled=false]
     * True to start disabled.
     */

    /**
     * @cfg {Boolean} [pressed=false]
     * True to start pressed (only if enableToggle = true)
     */

    /**
     * @cfg {String} toggleGroup
     * The group this toggle button is a member of (only 1 per group can be pressed)
     */

    /**
     * @cfg {Boolean/Object} [repeat=false]
     * True to repeat fire the click event while the mouse is down. This can also be a
     * {@link Ext.util.ClickRepeater ClickRepeater} config object.
     */

    /**
     * @cfg {Number} tabIndex
     * Set a DOM tabIndex for this button.
     */

    /**
     * @cfg {Boolean} [allowDepress=true]
     * False to not allow a pressed Button to be depressed. Only valid when {@link #enableToggle} is true.
     */

    /**
     * @cfg {Boolean} [enableToggle=false]
     * True to enable pressed/not pressed toggling.
     */
    enableToggle: false,

    /**
     * @cfg {Function} toggleHandler
     * Function called when a Button with {@link #enableToggle} set to true is clicked.
     * @cfg {Ext.button.Button} toggleHandler.button This button.
     * @cfg {Boolean} toggleHandler.state The next state of the Button, true means pressed.
     */

    /**
     * @cfg {Ext.menu.Menu/String/Object} menu
     * Standard menu attribute consisting of a reference to a menu object, a menu id or a menu config blob.
     */

    /**
     * @cfg {String} menuAlign
     * The position to align the menu to (see {@link Ext.Element#alignTo} for more details).
     */
    menuAlign: 'tl-bl?',

    /**
     * @cfg {String} textAlign
     * The text alignment for this button (center, left, right).
     */
    textAlign: 'center',

    /**
     * @cfg {String} overflowText
     * If used in a {@link Ext.toolbar.Toolbar Toolbar}, the text to be used if this item is shown in the overflow menu.
     * See also {@link Ext.toolbar.Item}.`{@link Ext.toolbar.Item#overflowText overflowText}`.
     */

    /**
     * @cfg {String} iconCls
     * A css class which sets a background image to be used as the icon for this button.
     */

    /**
     * @cfg {String} type
     * The type of `<input>` to create: submit, reset or button.
     */
    type: 'button',

    /**
     * @cfg {String} clickEvent
     * The DOM event that will fire the handler of the button. This can be any valid event name (dblclick, contextmenu).
     */
    clickEvent: 'click',

    /**
     * @cfg {Boolean} preventDefault
     * True to prevent the default action when the {@link #clickEvent} is processed.
     */
    preventDefault: true,

    /**
     * @cfg {Boolean} handleMouseEvents
     * False to disable visual cues on mouseover, mouseout and mousedown.
     */
    handleMouseEvents: true,

    /**
     * @cfg {String} tooltipType
     * The type of tooltip to use. Either 'qtip' for QuickTips or 'title' for title attribute.
     */
    tooltipType: 'qtip',

    /**
     * @cfg {String} [baseCls='x-btn']
     * The base CSS class to add to all buttons.
     */
    baseCls: Ext.baseCSSPrefix + 'btn',

    /**
     * @cfg {String} pressedCls
     * The CSS class to add to a button when it is in the pressed state.
     */
    pressedCls: 'pressed',

    /**
     * @cfg {String} overCls
     * The CSS class to add to a button when it is in the over (hovered) state.
     */
    overCls: 'over',

    /**
     * @cfg {String} focusCls
     * The CSS class to add to a button when it is in the focussed state.
     */
    focusCls: 'focus',

    /**
     * @cfg {String} menuActiveCls
     * The CSS class to add to a button when it's menu is active.
     */
    menuActiveCls: 'menu-active',

    /**
     * @cfg {String} href
     * The URL to open when the button is clicked. Specifying this config causes the Button to be
     * rendered with an anchor (An `<a>` element) as its active element, referencing the specified URL.
     *
     * This is better than specifying a click handler of
     *
     *     function() { window.location = "http://www.sencha.com" }
     *
     * because the UI will provide meaningful hints to the user as to what to expect upon clicking
     * the button, and will also allow the user to open in a new tab or window, bookmark or drag the URL, or directly save
     * the URL stream to disk.
     *
     * See also the {@link #hrefTarget} config.
     */
    
    /**
      * @cfg {String} [hrefTarget="_blank"]
      * The target attribute to use for the underlying anchor. Only used if the {@link #href}
      * property is specified.
      */
     hrefTarget: '_blank',
     
     border: true,

    /**
     * @cfg {Object} baseParams
     * An object literal of parameters to pass to the url when the {@link #href} property is specified.
     */

    /**
     * @cfg {Object} params
     * An object literal of parameters to pass to the url when the {@link #href} property is specified. Any params
     * override {@link #baseParams}. New params can be set using the {@link #setParams} method.
     */

    childEls: [
        'btnEl', 'btnWrap', 'btnInnerEl', 'btnIconEl'
    ],

    renderTpl: [
        '<em id="{id}-btnWrap"<tpl if="splitCls"> class="{splitCls}"</tpl>>',
            '<tpl if="href">',
                '<a id="{id}-btnEl" href="{href}" class="{btnCls}" target="{hrefTarget}"',
                    '<tpl if="tabIndex"> tabIndex="{tabIndex}"</tpl>',
                    '<tpl if="disabled"> disabled="disabled"</tpl>',
                    ' role="link">',
                    '<span id="{id}-btnInnerEl" class="{baseCls}-inner">',
                        '{text}',
                    '</span>',
                    '<span id="{id}-btnIconEl" class="{baseCls}-icon {iconCls}"<tpl if="iconUrl"> style="background-image:url({iconUrl})"</tpl>></span>',
                '</a>',
            '<tpl else>',
                '<button id="{id}-btnEl" type="{type}" class="{btnCls}" hidefocus="true"',
                    // the autocomplete="off" is required to prevent Firefox from remembering
                    // the button's disabled state between page reloads.
                    '<tpl if="tabIndex"> tabIndex="{tabIndex}"</tpl>',
                    '<tpl if="disabled"> disabled="disabled"</tpl>',
                    ' role="button" autocomplete="off">',
                    '<span id="{id}-btnInnerEl" class="{baseCls}-inner" style="{innerSpanStyle}">',
                        '{text}',
                    '</span>',
                    '<span id="{id}-btnIconEl" class="{baseCls}-icon {iconCls}"<tpl if="iconUrl"> style="background-image:url({iconUrl})"</tpl>></span>',
                '</button>',
            '</tpl>',
        '</em>',
        '<tpl if="closable">',
            '<a id="{id}-closeEl" href="#" class="{baseCls}-close-btn" title="{closeText}"></a>',
        '</tpl>'
    ],

    /**
     * @cfg {String} scale
     * The size of the Button. Three values are allowed:
     *
     * - 'small' - Results in the button element being 16px high.
     * - 'medium' - Results in the button element being 24px high.
     * - 'large' - Results in the button element being 32px high.
     */
    scale: 'small',

    /**
     * @private
     * An array of allowed scales.
     */
    allowedScales: ['small', 'medium', 'large'],

    /**
     * @cfg {Object} scope
     * The scope (**this** reference) in which the `{@link #handler}` and `{@link #toggleHandler}` is executed.
     * Defaults to this Button.
     */

    /**
     * @cfg {String} iconAlign
     * The side of the Button box to render the icon. Four values are allowed:
     *
     * - 'top'
     * - 'right'
     * - 'bottom'
     * - 'left'
     */
    iconAlign: 'left',

    /**
     * @cfg {String} arrowAlign
     * The side of the Button box to render the arrow if the button has an associated {@link #cfg-menu}. Two
     * values are allowed:
     *
     * - 'right'
     * - 'bottom'
     */
    arrowAlign: 'right',

    /**
     * @cfg {String} arrowCls
     * The className used for the inner arrow element if the button has a menu.
     */
    arrowCls: 'arrow',

    /**
     * @property {Ext.Template} template
     * A {@link Ext.Template Template} used to create the Button's DOM structure.
     *
     * Instances, or subclasses which need a different DOM structure may provide a different template layout in
     * conjunction with an implementation of {@link #getTemplateArgs}.
     */

    /**
     * @cfg {String} cls
     * A CSS class string to apply to the button's main element.
     */

    /**
     * @property {Ext.menu.Menu} menu
     * The {@link Ext.menu.Menu Menu} object associated with this Button when configured with the {@link #cfg-menu} config
     * option.
     */

    maskOnDisable: false,
    
    /**
     * @private
     * @property persistentPadding
     * The padding spuriously added to a &lt;button> element which must be accounted for in the margins of the innerEl.
     * This is calculated at first render time by creating a hidden button and measuring its insides.
     */
    persistentPadding: undefined,

    shrinkWrap: 3,

    frame: true,

    // inherit docs
    initComponent: function() {
        var me = this;
        me.callParent(arguments);

        me.addEvents(
            /**
             * @event click
             * Fires when this button is clicked, before the configured {@link #handler} is invoked. Execution of the
             * {@link #handler} may be vetoed by returning <code>false</code> to this event.
             * @param {Ext.button.Button} this
             * @param {Event} e The click event
             */
            'click',

            /**
             * @event toggle
             * Fires when the 'pressed' state of this button changes (only if enableToggle = true)
             * @param {Ext.button.Button} this
             * @param {Boolean} pressed
             */
            'toggle',

            /**
             * @event mouseover
             * Fires when the mouse hovers over the button
             * @param {Ext.button.Button} this
             * @param {Event} e The event object
             */
            'mouseover',

            /**
             * @event mouseout
             * Fires when the mouse exits the button
             * @param {Ext.button.Button} this
             * @param {Event} e The event object
             */
            'mouseout',

            /**
             * @event menushow
             * If this button has a menu, this event fires when it is shown
             * @param {Ext.button.Button} this
             * @param {Ext.menu.Menu} menu
             */
            'menushow',

            /**
             * @event menuhide
             * If this button has a menu, this event fires when it is hidden
             * @param {Ext.button.Button} this
             * @param {Ext.menu.Menu} menu
             */
            'menuhide',

            /**
             * @event menutriggerover
             * If this button has a menu, this event fires when the mouse enters the menu triggering element
             * @param {Ext.button.Button} this
             * @param {Ext.menu.Menu} menu
             * @param {Event} e
             */
            'menutriggerover',

            /**
             * @event menutriggerout
             * If this button has a menu, this event fires when the mouse leaves the menu triggering element
             * @param {Ext.button.Button} this
             * @param {Ext.menu.Menu} menu
             * @param {Event} e
             */
            'menutriggerout'
        );

        if (me.menu) {
            // Flag that we'll have a splitCls
            me.split = true;

            // retrieve menu by id or instantiate instance if needed
            me.menu = Ext.menu.Manager.get(me.menu);
            me.menu.ownerButton = me;
        }

        // Accept url as a synonym for href
        if (me.url) {
            me.href = me.url;
        }

        // preventDefault defaults to false for links
        if (me.href && !me.hasOwnProperty('preventDefault')) {
            me.preventDefault = false;
        }

        if (Ext.isString(me.toggleGroup)) {
            me.enableToggle = true;
        }

    },

    // inherit docs
    getActionEl: function() {
        return this.btnEl;
    },

    // inherit docs
    getFocusEl: function() {
        return this.inOnFocus ? this.el : this.btnEl;
    },

    // Buttons add the focus class to the *outermost element*, not the focusEl!
    onFocus: function(e) {
        var me = this;

        // Set this flag, so that when AbstractComponent's onFocus gets the focusEl to add the focusCls
        // to, it will get the encapsulating element - that's what the CSS rules for Button need right now
        me.inOnFocus = true;
        me.callParent(arguments);
        me.inOnFocus = false;
    },

    // Buttons add the focus class to the *outermost element*, not the focusEl!
    onBlur : function(e) {
        var me = this,
            focusCls = me.focusCls,
            targetEl = me.getEl();

        if (me.destroying) {
            return;
        }

        me.beforeBlur(e);
        if (focusCls && targetEl) {
            targetEl.removeCls(me.removeClsWithUI(focusCls, true));
        }
        if (me.validateOnBlur) {
            me.validate();
        }
        me.hasFocus = false;
        me.fireEvent('blur', me, e);
        me.postBlur(e);
    },

    // private
    setComponentCls: function() {
        var me = this,
            cls = me.getComponentCls();

        if (!Ext.isEmpty(me.oldCls)) {
            me.removeClsWithUI(me.oldCls);
            me.removeClsWithUI(me.pressedCls);
        }

        me.oldCls = cls;
        me.addClsWithUI(cls);
    },

    getComponentCls: function() {
        var me = this,
            cls = [];

        // Check whether the button has an icon or not, and if it has an icon, what is the alignment
        if (me.iconCls || me.icon) {
            if (me.text) {
                cls.push('icon-text-' + me.iconAlign);
            } else {
                cls.push('icon');
            }
        } else if (me.text) {
            cls.push('noicon');
        }

        if (me.pressed) {
            cls.push(me.pressedCls);
        }
        return cls;
    },

    beforeRender: function () {
        var me = this;

        me.callParent();

        // Add all needed classes to the protoElement.
        me.oldCls = me.getComponentCls();
        me.addClsWithUI(me.oldCls);

        // Apply the renderData to the template args
        Ext.applyIf(me.renderData, me.getTemplateArgs());

        if (me.scale) {
            me.setScale(me.scale);
        }
    },

    // private
    onRender: function() {
        var me = this,
            btn,
            btnListeners;

        me.doc = Ext.getDoc();
        me.callParent(arguments);

        // If it is a split button + has a toolip for the arrow
        if (me.split && me.arrowTooltip) {
            me.arrowEl.dom.setAttribute(me.getTipAttr(), me.arrowTooltip);
        }

        // Set btn as a local variable for easy access
        btn = me.el;

        if (me.tooltip) {
            me.setTooltip(me.tooltip, true);
        }

        // Add the mouse events to the button
        if (me.handleMouseEvents) {
            btnListeners = {
                scope: me,
                mouseover: me.onMouseOver,
                mouseout: me.onMouseOut,
                mousedown: me.onMouseDown
            };
            if (me.split) {
                btnListeners.mousemove = me.onMouseMove;
            }
        } else {
            btnListeners = {
                scope: me
            };
        }

        // Check if the button has a menu
        if (me.menu) {
            me.mon(me.menu, {
                scope: me,
                show: me.onMenuShow,
                hide: me.onMenuHide
            });

            me.keyMap = new Ext.util.KeyMap({
                target: me.el,
                key: Ext.EventObject.DOWN,
                handler: me.onDownKey,
                scope: me
            });
        }

        // Check if it is a repeat button
        if (me.repeat) {
            me.mon(new Ext.util.ClickRepeater(btn, Ext.isObject(me.repeat) ? me.repeat: {}), 'click', me.onRepeatClick, me);
        } else {
            btnListeners[me.clickEvent] = me.onClick;
        }

        // Add whatever button listeners we need
        me.mon(btn, btnListeners);

        // Register the button in the toggle manager
        Ext.ButtonToggleManager.register(me);
    },

    /**
     * This method returns an object which provides substitution parameters for the {@link #renderTpl XTemplate} used to
     * create this Button's DOM structure.
     *
     * Instances or subclasses which use a different Template to create a different DOM structure may need to provide
     * their own implementation of this method.
     *
     * @return {Object} Substitution data for a Template. The default implementation which provides data for the default
     * {@link #template} returns an Object containing the following properties:
     * @return {String} return.type The `<button>`'s {@link #type}
     * @return {String} return.splitCls A CSS class to determine the presence and position of an arrow icon.
     * (`'x-btn-arrow'` or `'x-btn-arrow-bottom'` or `''`)
     * @return {String} return.cls A CSS class name applied to the Button's main `<tbody>` element which determines the
     * button's scale and icon alignment.
     * @return {String} return.text The {@link #text} to display ion the Button.
     * @return {Number} return.tabIndex The tab index within the input flow.
     */
    getTemplateArgs: function() {
        var me = this,
            persistentPadding = me.getPersistentPadding(),
            innerSpanStyle = '';

        // Create negative margin offsets to counteract persistent button padding if needed
        if (Math.max.apply(Math, persistentPadding) > 0) {
            innerSpanStyle = 'margin:' + Ext.Array.map(persistentPadding, function(pad) {
                return -pad + 'px';
            }).join(' ');
        }

        return {
            href     : me.getHref(),
            disabled : me.disabled,
            hrefTarget: me.hrefTarget,
            type     : me.type,
            btnCls   : me.getBtnCls(),
            splitCls : me.getSplitCls(),
            iconUrl  : me.icon,
            iconCls  : me.iconCls,
            text     : me.text || '&#160;',
            tabIndex : me.tabIndex,
            innerSpanStyle: innerSpanStyle
        };
    },

    /**
     * @private
     * If there is a configured href for this Button, returns the href with parameters appended.
     * @returns The href string with parameters appended.
     */
    getHref: function() {
        var me = this,
            params = Ext.apply({}, me.baseParams);

        // write baseParams first, then write any params
        params = Ext.apply(params, me.params);
        return me.href ? Ext.urlAppend(me.href, Ext.Object.toQueryString(params)) : false;
    },

    /**
     * Sets the href of the link dynamically according to the params passed, and any {@link #baseParams} configured.
     *
     * **Only valid if the Button was originally configured with a {@link #href}**
     *
     * @param {Object} params Parameters to use in the href URL.
     */
    setParams: function(params) {
        this.params = params;
        this.btnEl.dom.href = this.getHref();
    },

    getSplitCls: function() {
        var me = this;
        return me.split ? (me.baseCls + '-' + me.arrowCls) + ' ' + (me.baseCls + '-' + me.arrowCls + '-' + me.arrowAlign) : '';
    },

    getBtnCls: function() {
        return this.textAlign ? this.baseCls + '-' + this.textAlign : '';
    },

    /**
     * Sets the CSS class that provides a background image to use as the button's icon. This method also changes the
     * value of the {@link #iconCls} config internally.
     * @param {String} cls The CSS class providing the icon image
     * @return {Ext.button.Button} this
     */
    setIconCls: function(cls) {
        var me = this,
            btnIconEl = me.btnIconEl,
            oldCls = me.iconCls;
            
        me.iconCls = cls;
        if (btnIconEl) {
            // Remove the previous iconCls from the button
            btnIconEl.removeCls(oldCls);
            btnIconEl.addCls(cls || '');
            me.setComponentCls();
            if (me.didIconStateChange(oldCls, cls)) {
                me.updateLayout();
            }
        }
        return me;
    },

    /**
     * Sets the tooltip for this Button.
     *
     * @param {String/Object} tooltip This may be:
     *
     *   - **String** : A string to be used as innerHTML (html tags are accepted) to show in a tooltip
     *   - **Object** : A configuration object for {@link Ext.tip.QuickTipManager#register}.
     *
     * @return {Ext.button.Button} this
     */
    setTooltip: function(tooltip, initial) {
        var me = this;

        if (me.rendered) {
            if (!initial) {
                me.clearTip();
            }
            if (Ext.isObject(tooltip)) {
                Ext.tip.QuickTipManager.register(Ext.apply({
                    target: me.btnEl.id
                },
                tooltip));
                me.tooltip = tooltip;
            } else {
                me.btnEl.dom.setAttribute(me.getTipAttr(), tooltip);
            }
        } else {
            me.tooltip = tooltip;
        }
        return me;
    },

    /**
     * Sets the text alignment for this button.
     * @param {String} align The new alignment of the button text. See {@link #textAlign}.
     */
    setTextAlign: function(align) {
        var me = this,
            btnEl = me.btnEl;

        if (btnEl) {
            btnEl.removeCls(me.baseCls + '-' + me.textAlign);
            btnEl.addCls(me.baseCls + '-' + align);
        }
        me.textAlign = align;
        return me;
    },

    getTipAttr: function(){
        return this.tooltipType == 'qtip' ? 'data-qtip' : 'title';
    },

    // private
    getRefItems: function(deep){
        var menu = this.menu,
            items;
        
        if (menu) {
            items = menu.getRefItems(deep);
            items.unshift(menu);
        }
        return items || [];
    },

    // private
    clearTip: function() {
        if (Ext.isObject(this.tooltip)) {
            Ext.tip.QuickTipManager.unregister(this.btnEl);
        }
    },

    // private
    beforeDestroy: function() {
        var me = this;
        if (me.rendered) {
            me.clearTip();
        }
        if (me.menu && me.destroyMenu !== false) {
            Ext.destroy(me.menu);
        }
        Ext.destroy(me.btnInnerEl, me.repeater);
        me.callParent();
    },

    // private
    onDestroy: function() {
        var me = this;
        if (me.rendered) {
            me.doc.un('mouseover', me.monitorMouseOver, me);
            me.doc.un('mouseup', me.onMouseUp, me);
            delete me.doc;
            Ext.ButtonToggleManager.unregister(me);

            Ext.destroy(me.keyMap);
            delete me.keyMap;
        }
        me.callParent();
    },

    /**
     * Assigns this Button's click handler
     * @param {Function} handler The function to call when the button is clicked
     * @param {Object} [scope] The scope (`this` reference) in which the handler function is executed.
     * Defaults to this Button.
     * @return {Ext.button.Button} this
     */
    setHandler: function(handler, scope) {
        this.handler = handler;
        this.scope = scope;
        return this;
    },

    /**
     * Sets this Button's text
     * @param {String} text The button text
     * @return {Ext.button.Button} this
     */
    setText: function(text) {
        var me = this;
        me.text = text;
        if (me.rendered) {
            me.btnInnerEl.update(text || '&#160;');
            me.setComponentCls();
            if (Ext.isStrict && Ext.isIE8) {
                // weird repaint issue causes it to not resize
                me.el.repaint();
            }
            me.updateLayout();
        }
        return me;
    },

    /**
     * Sets the background image (inline style) of the button. This method also changes the value of the {@link #icon}
     * config internally.
     * @param {String} icon The path to an image to display in the button
     * @return {Ext.button.Button} this
     */
    setIcon: function(icon) {
        var me = this,
            btnIconEl = me.btnIconEl,
            oldIcon = me.icon;
            
        me.icon = icon;
        if (btnIconEl) {
            btnIconEl.setStyle('background-image', icon ? 'url(' + icon + ')': '');
            me.setComponentCls();
            if (me.didIconStateChange(oldIcon, icon)) {
                me.updateLayout();
            }
        }
        return me;
    },
    
    /**
     * Checks if the icon/iconCls changed from being empty to having a value, or having a value to being empty.
     * @private
     * @param {String} old The old icon/iconCls
     * @param {String} current The current icon/iconCls
     * @return {Boolean} True if the icon state changed
     */
    didIconStateChange: function(old, current) {
        var currentEmpty = Ext.isEmpty(current);
        return Ext.isEmpty(old) ? !currentEmpty : currentEmpty;
    },

    /**
     * Gets the text for this Button
     * @return {String} The button text
     */
    getText: function() {
        return this.text;
    },

    /**
     * If a state it passed, it becomes the pressed state otherwise the current state is toggled.
     * @param {Boolean} [state] Force a particular state
     * @param {Boolean} [suppressEvent=false] True to stop events being fired when calling this method.
     * @return {Ext.button.Button} this
     */
    toggle: function(state, suppressEvent) {
        var me = this;
        state = state === undefined ? !me.pressed: !!state;
        if (state !== me.pressed) {
            if (me.rendered) {
                me[state ? 'addClsWithUI': 'removeClsWithUI'](me.pressedCls);
            }
            me.pressed = state;
            if (!suppressEvent) {
                me.fireEvent('toggle', me, state);
                Ext.callback(me.toggleHandler, me.scope || me, [me, state]);
            }
        }
        return me;
    },
    
    maybeShowMenu: function(){
        var me = this;
        if (me.menu && !me.hasVisibleMenu() && !me.ignoreNextClick) {
            me.showMenu();
        }
    },

    /**
     * Shows this button's menu (if it has one)
     */
    showMenu: function() {
        var me = this;
        if (me.rendered && me.menu) {
            if (me.tooltip && me.getTipAttr() != 'title') {
                Ext.tip.QuickTipManager.getQuickTip().cancelShow(me.btnEl);
            }
            if (me.menu.isVisible()) {
                me.menu.hide();
            }

            me.menu.showBy(me.el, me.menuAlign, ((!Ext.isStrict && Ext.isIE) || Ext.isIE6) ? [-2, -2] : undefined);
        }
        return me;
    },

    /**
     * Hides this button's menu (if it has one)
     */
    hideMenu: function() {
        if (this.hasVisibleMenu()) {
            this.menu.hide();
        }
        return this;
    },

    /**
     * Returns true if the button has a menu and it is visible
     * @return {Boolean}
     */
    hasVisibleMenu: function() {
        var menu = this.menu;
        return menu && menu.rendered && menu.isVisible();
    },

    // private
    onRepeatClick: function(repeat, e) {
        this.onClick(e);
    },

    // private
    onClick: function(e) {
        var me = this;
        if (me.preventDefault || (me.disabled && me.getHref()) && e) {
            e.preventDefault();
        }
        if (e.button !== 0) {
            return;
        }
        if (!me.disabled) {
            me.doToggle();
            me.maybeShowMenu();
            me.fireHandler(e);
        }
    },
    
    fireHandler: function(e){
        var me = this,
            handler = me.handler;
            
        if (me.fireEvent('click', me, e) !== false) {
            if (handler) {
                handler.call(me.scope || me, me, e);
            }
            me.blur();
        }
    },
    
    doToggle: function(){
        var me = this;    
        if (me.enableToggle && (me.allowDepress !== false || !me.pressed)) {
            me.toggle();
        }
    },

    /**
     * @private mouseover handler called when a mouseover event occurs anywhere within the encapsulating element.
     * The targets are interrogated to see what is being entered from where.
     * @param e
     */
    onMouseOver: function(e) {
        var me = this;
        if (!me.disabled && !e.within(me.el, true, true)) {
            me.onMouseEnter(e);
        }
    },

    /**
     * @private
     * mouseout handler called when a mouseout event occurs anywhere within the encapsulating element -
     * or the mouse leaves the encapsulating element.
     * The targets are interrogated to see what is being exited to where.
     * @param e
     */
    onMouseOut: function(e) {
        var me = this;
        if (!e.within(me.el, true, true)) {
            if (me.overMenuTrigger) {
                me.onMenuTriggerOut(e);
            }
            me.onMouseLeave(e);
        }
    },

    /**
     * @private
     * mousemove handler called when the mouse moves anywhere within the encapsulating element.
     * The position is checked to determine if the mouse is entering or leaving the trigger area. Using
     * mousemove to check this is more resource intensive than we'd like, but it is necessary because
     * the trigger area does not line up exactly with sub-elements so we don't always get mouseover/out
     * events when needed. In the future we should consider making the trigger a separate element that
     * is absolutely positioned and sized over the trigger area.
     */
    onMouseMove: function(e) {
        var me = this,
            el = me.el,
            over = me.overMenuTrigger,
            overlap, btnSize;

        if (me.split) {
            if (me.arrowAlign === 'right') {
                overlap = e.getX() - el.getX();
                btnSize = el.getWidth();
            } else {
                overlap = e.getY() - el.getY();
                btnSize = el.getHeight();
            }

            if (overlap > (btnSize - me.getTriggerSize())) {
                if (!over) {
                    me.onMenuTriggerOver(e);
                }
            } else {
                if (over) {
                    me.onMenuTriggerOut(e);
                }
            }
        }
    },

    /**
     * @private
     * Measures the size of the trigger area for menu and split buttons. Will be a width for
     * a right-aligned trigger and a height for a bottom-aligned trigger. Cached after first measurement.
     */
    getTriggerSize: function() {
        var me = this,
            size = me.triggerSize,
            side, sideFirstLetter, undef;

        if (size === undef) {
            side = me.arrowAlign;
            sideFirstLetter = side.charAt(0);
            size = me.triggerSize = me.el.getFrameWidth(sideFirstLetter) + me.btnWrap.getFrameWidth(sideFirstLetter) + me.frameSize[side];
        }
        return size;
    },

    /**
     * @private
     * virtual mouseenter handler called when it is detected that the mouseout event
     * signified the mouse entering the encapsulating element.
     * @param e
     */
    onMouseEnter: function(e) {
        var me = this;
        me.addClsWithUI(me.overCls);
        me.fireEvent('mouseover', me, e);
    },

    /**
     * @private
     * virtual mouseleave handler called when it is detected that the mouseover event
     * signified the mouse entering the encapsulating element.
     * @param e
     */
    onMouseLeave: function(e) {
        var me = this;
        me.removeClsWithUI(me.overCls);
        me.fireEvent('mouseout', me, e);
    },

    /**
     * @private
     * virtual mouseenter handler called when it is detected that the mouseover event
     * signified the mouse entering the arrow area of the button - the `<em>`.
     * @param e
     */
    onMenuTriggerOver: function(e) {
        var me = this;
        me.overMenuTrigger = true;
        me.fireEvent('menutriggerover', me, me.menu, e);
    },

    /**
     * @private
     * virtual mouseleave handler called when it is detected that the mouseout event
     * signified the mouse leaving the arrow area of the button - the `<em>`.
     * @param e
     */
    onMenuTriggerOut: function(e) {
        var me = this;
        delete me.overMenuTrigger;
        me.fireEvent('menutriggerout', me, me.menu, e);
    },

    // inherit docs
    enable : function(silent) {
        var me = this;

        me.callParent(arguments);

        if (me.btnEl) {
            me.btnEl.dom.disabled = false;
        }
        me.removeClsWithUI('disabled');

        return me;
    },

    // inherit docs
    disable : function(silent) {
        var me = this;

        me.callParent(arguments);

        if (me.btnEl) {
            me.btnEl.dom.disabled = true;
        }
        me.addClsWithUI('disabled');
        me.removeClsWithUI(me.overCls);

        // IE renders disabled text by layering gray text on top of white text, offset by 1 pixel. Normally this is fine
        // but in some circumstances (such as using formBind) it gets confused and renders them side by side instead.
        if (me.btnInnerEl && (Ext.isIE6 || Ext.isIE7)) {
            me.btnInnerEl.repaint();
        }

        return me;
    },

    /**
     * Method to change the scale of the button. See {@link #scale} for allowed configurations.
     * @param {String} scale The scale to change to.
     */
    setScale: function(scale) {
        var me = this,
            ui = me.ui.replace('-' + me.scale, '');

        //check if it is an allowed scale
        if (!Ext.Array.contains(me.allowedScales, scale)) {
            throw('#setScale: scale must be an allowed scale (' + me.allowedScales.join(', ') + ')');
        }

        me.scale = scale;
        me.setUI(ui);
    },

    // inherit docs
    setUI: function(ui) {
        var me = this;

        //we need to append the scale to the UI, if not already done
        if (me.scale && !ui.match(me.scale)) {
            ui = ui + '-' + me.scale;
        }

        me.callParent([ui]);

        // Set all the state classNames, as they need to include the UI
        // me.disabledCls += ' ' + me.baseCls + '-' + me.ui + '-disabled';
    },

    // private
    onMouseDown: function(e) {
        var me = this;
        if (!me.disabled && e.button === 0) {
            me.addClsWithUI(me.pressedCls);
            me.doc.on('mouseup', me.onMouseUp, me);
        }
    },
    // private
    onMouseUp: function(e) {
        var me = this;
        if (e.button === 0) {
            if (!me.pressed) {
                me.removeClsWithUI(me.pressedCls);
            }
            me.doc.un('mouseup', me.onMouseUp, me);
        }
    },
    // private
    onMenuShow: function(e) {
        var me = this;
        me.ignoreNextClick = 0;
        me.addClsWithUI(me.menuActiveCls);
        me.fireEvent('menushow', me, me.menu);
    },

    // private
    onMenuHide: function(e) {
        var me = this;
        me.removeClsWithUI(me.menuActiveCls);
        me.ignoreNextClick = Ext.defer(me.restoreClick, 250, me);
        me.fireEvent('menuhide', me, me.menu);
    },

    // private
    restoreClick: function() {
        this.ignoreNextClick = 0;
    },

    // private
    onDownKey: function() {
        var me = this;

        if (!me.disabled) {
            if (me.menu) {
                me.showMenu();
            }
        }
    },

    /**
     * @private
     * Some browsers (notably Safari and older Chromes on Windows) add extra "padding" inside the button
     * element that cannot be removed. This method returns the size of that padding with a one-time detection.
     * @return {Number[]} [top, right, bottom, left]
     */
    getPersistentPadding: function() {
        var me = this,
            padding = me.persistentPadding,
            btn, leftTop, btnEl, btnInnerEl;

        // Create auto-size button offscreen and measure its insides
        // Short-circuit IE as it sometimes gives false positive for padding
        if (!padding) {
            padding = me.self.prototype.persistentPadding = [0, 0, 0, 0];
            if (!Ext.isIE) {
                btn = new Ext.button.Button({
                    text: 'test',
                    style: 'position:absolute;top:-999px;'
                });
                btn.el = Ext.DomHelper.append(Ext.getBody(), btn.getRenderTree(), true);
                btn.applyChildEls(btn.el);
                btnEl = btn.btnEl;
                btnInnerEl = btn.btnInnerEl;
                btnEl.setSize(null, null); //clear any hard dimensions on the button el to see what it does naturally
                leftTop = btnInnerEl.getOffsetsTo(btnEl);
                padding[0] = leftTop[1];
                padding[1] = btnEl.getWidth() - btnInnerEl.getWidth() - leftTop[0];
                padding[2] = btnEl.getHeight() - btnInnerEl.getHeight() - leftTop[1];
                padding[3] = leftTop[0];
                
                btn.destroy();
                btn.el.remove();
            }
        }
        return padding;
    }
}, function() {
    var groups = {},
        toggleGroup = function(btn, state) {
            if (state) {
                var g = groups[btn.toggleGroup],
                    length = g.length,
                    i;

                for (i = 0; i < length; i++) {
                    if (g[i] !== btn) {
                        g[i].toggle(false);
                    }
                }
            }
        };

    // Private utility class used by Button
    Ext.ButtonToggleManager = {
        register: function(btn) {
            if (!btn.toggleGroup) {
                return;
            }
            var group = groups[btn.toggleGroup];
            if (!group) {
                group = groups[btn.toggleGroup] = [];
            }
            group.push(btn);
            btn.on('toggle', toggleGroup);
        },

        unregister: function(btn) {
            if (!btn.toggleGroup) {
                return;
            }
            var group = groups[btn.toggleGroup];
            if (group) {
                Ext.Array.remove(group, btn);
                btn.un('toggle', toggleGroup);
            }
        },

        // Gets the pressed button in the passed group or null
        // @param {String} group
        // @return {Ext.button.Button}
        getPressed: function(group) {
            var g = groups[group],
                i = 0,
                len;
            if (g) {
                for (len = g.length; i < len; i++) {
                    if (g[i].pressed === true) {
                        return g[i];
                    }
                }
            }
            return null;
        }
    };
});
