/**
 * @class Ext.button.Button
 * @extends Ext.Component

Create simple buttons with this component. Customisations include {@link #config-iconAlign aligned}
{@link #config-iconCls icons}, {@link #config-menu dropdown menus}, {@link #config-tooltip tooltips}
and {@link #config-scale sizing options}. Specify a {@link #config-handler handler} to run code when
a user clicks the button, or use {@link #config-listeners listeners} for other events such as
{@link #events-mouseover mouseover}.

{@img Ext.button.Button/Ext.button.Button1.png Ext.button.Button component}
Example usage:

    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:

    Ext.create('Ext.Button', {
        text    : 'Dyanmic 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:

    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'`

{@img Ext.button.Button/Ext.button.Button2.png Ext.button.Button component}
Example usage:

    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`.
{@img Ext.button.Button/Ext.button.Button3.png Ext.button.Button component}
Example usage:

    Ext.create('Ext.Button', {
        renderTo: Ext.getBody(),
        text: 'Click Me',
        enableToggle: true
    });

You can assign a menu to a button by using the {@link #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.
{@img Ext.button.Button/Ext.button.Button4.png Ext.button.Button component}
Example usage:

    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:

    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.');
                }
            }
        }
    });

 * @constructor
 * Create a new button
 * @param {Object} config The config object
 * @xtype button
 * @markdown
 * @docauthor Robert Dougan <rob@sencha.com>
 */
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 */

    isButton: true,
    componentLayout: 'button',

    /**
     * Read-only. True if this button is hidden
     * @type Boolean
     */
    hidden: false,

    /**
     * Read-only. True if this button is disabled
     * @type Boolean
     */
    disabled: false,

    /**
     * Read-only. True if this button is pressed (only if enableToggle = true)
     * @type Boolean
     */
    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 (the image will be set as the background-image
     * CSS property of the button by default, so if you want a mixed icon/text button, set cls:'x-btn-text-icon')
     */

    /**
     * @cfg {Function} handler A function called when the button is clicked (can be used instead of click event).
     * The handler is passed the following parameters:<div class="mdetail-params"><ul>
     * <li><code>b</code> : Button<div class="sub-desc">This Button.</div></li>
     * <li><code>e</code> : EventObject<div class="sub-desc">The click event.</div></li>
     * </ul></div>
     */

    /**
     * @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}.<tt>{@link Ext.panel.Panel#minButtonWidth minButtonWidth}</tt>.
     */

    /**
     * @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 True to start hidden (defaults to false)
     */

    /**
     * @cfg {Boolean} disabled True to start disabled (defaults to false)
     */

    /**
     * @cfg {Boolean} pressed 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 True to repeat fire the click event while the mouse is down. This can also be
     * a {@link Ext.util.ClickRepeater ClickRepeater} config object (defaults to false).
     */

    /**
     * @cfg {Number} tabIndex Set a DOM tabIndex for this button (defaults to undefined)
     */

    /**
     * @cfg {Boolean} allowDepress
     * False to not allow a pressed Button to be depressed (defaults to undefined). Only valid when {@link #enableToggle} is true.
     */

    /**
     * @cfg {Boolean} enableToggle
     * True to enable pressed/not pressed toggling (defaults to false)
     */
    enableToggle: false,

    /**
     * @cfg {Function} toggleHandler
     * Function called when a Button with {@link #enableToggle} set to true is clicked. Two arguments are passed:<ul class="mdetail-params">
     * <li><b>button</b> : Ext.button.Button<div class="sub-desc">this Button object</div></li>
     * <li><b>state</b> : Boolean<div class="sub-desc">The next state of the Button, true means pressed.</div></li>
     * </ul>
     */

    /**
     * @cfg {Mixed} menu
     * Standard menu attribute consisting of a reference to a menu object, a menu id or a menu config blob (defaults to undefined).
     */

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

    /**
     * @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}.<code>{@link Ext.toolbar.Item#overflowText overflowText}</code>.
     */

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

    /**
     * @cfg {String} type
     * submit, reset or button - defaults to '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).
     * Defaults to <tt>'click'</tt>.
     */
    clickEvent: 'click',
    
    /**
     * @cfg {Boolean} preventDefault
     * True to prevent the default action when the {@link #clickEvent} is processed. Defaults to true.
     */
    preventDefault: true,

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

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

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

    /**
     * @cfg {String} pressedCls
     * The CSS class to add to a button when it is in the pressed state. (Defaults to 'x-btn-pressed')
     */
    pressedCls: 'pressed',
    
    /**
     * @cfg {String} overCls
     * The CSS class to add to a button when it is in the over (hovered) state. (Defaults to 'x-btn-over')
     */
    overCls: 'over',
    
    /**
     * @cfg {String} focusCls
     * The CSS class to add to a button when it is in the focussed state. (Defaults to 'x-btn-focus')
     */
    focusCls: 'focus',
    
    /**
     * @cfg {String} menuActiveCls
     * The CSS class to add to a button when it's menu is active. (Defaults to 'x-btn-menu-active')
     */
    menuActiveCls: 'menu-active',

    ariaRole: 'button',

    // inherited
    renderTpl:
        '<em class="{splitCls}">' +
            '<tpl if="href">' +
                '<a href="{href}" target="{target}"<tpl if="tabIndex"> tabIndex="{tabIndex}"</tpl> role="link">' +
                    '<span class="{baseCls}-inner">{text}</span>' +
                '</a>' +
            '</tpl>' +
            '<tpl if="!href">' +
                '<button type="{type}" 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> role="button" autocomplete="off">' +
                    '<span class="{baseCls}-inner" style="{innerSpanStyle}">{text}</span>' +
                '</button>' +
            '</tpl>' +
        '</em>' ,

    /**
     * @cfg {String} scale
     * <p>(Optional) The size of the Button. Three values are allowed:</p>
     * <ul class="mdetail-params">
     * <li>'small'<div class="sub-desc">Results in the button element being 16px high.</div></li>
     * <li>'medium'<div class="sub-desc">Results in the button element being 24px high.</div></li>
     * <li>'large'<div class="sub-desc">Results in the button element being 32px high.</div></li>
     * </ul>
     * <p>Defaults to <b><tt>'small'</tt></b>.</p>
     */
    scale: 'small',
    
    /**
     * @private An array of allowed scales.
     */
    allowedScales: ['small', 'medium', 'large'],
    
    /**
     * @cfg {Object} scope The scope (<tt><b>this</b></tt> reference) in which the
     * <code>{@link #handler}</code> and <code>{@link #toggleHandler}</code> is
     * executed. Defaults to this Button.
     */

    /**
     * @cfg {String} iconAlign
     * <p>(Optional) The side of the Button box to render the icon. Four values are allowed:</p>
     * <ul class="mdetail-params">
     * <li>'top'<div class="sub-desc"></div></li>
     * <li>'right'<div class="sub-desc"></div></li>
     * <li>'bottom'<div class="sub-desc"></div></li>
     * <li>'left'<div class="sub-desc"></div></li>
     * </ul>
     * <p>Defaults to <b><tt>'left'</tt></b>.</p>
     */
    iconAlign: 'left',

    /**
     * @cfg {String} arrowAlign
     * <p>(Optional) The side of the Button box to render the arrow if the button has an associated {@link #menu}.
     * Two values are allowed:</p>
     * <ul class="mdetail-params">
     * <li>'right'<div class="sub-desc"></div></li>
     * <li>'bottom'<div class="sub-desc"></div></li>
     * </ul>
     * <p>Defaults to <b><tt>'right'</tt></b>.</p>
     */
    arrowAlign: 'right',

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

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

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

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

    /**
     * @cfg {Boolean} autoWidth
     * By default, if a width is not specified the button will attempt to stretch horizontally to fit its content.
     * If the button is being managed by a width sizing layout (hbox, fit, anchor), set this to false to prevent
     * the button from doing this automatic sizing.
     * Defaults to <tt>undefined</tt>.
     */
     
    maskOnDisable: false,

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

        me.addEvents(
            /**
             * @event click
             * Fires when this button is clicked
             * @param {Button} this
             * @param {EventObject} e The click event
             */
            'click',

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

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

            /**
             * @event mouseout
             * Fires when the mouse exits the button
             * @param {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 {Button} this
             * @param {Menu} menu
             */
            'menushow',

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

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

            /**
             * @event menutriggerout
             * If this button has a menu, this event fires when the mouse leaves the menu triggering element
             * @param {Button} this
             * @param {Menu} menu
             * @param {EventObject} 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.ownerCt = 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;
        }

    },

    // private
    initAria: function() {
        this.callParent();
        var actionEl = this.getActionEl();
        if (this.menu) {
            actionEl.dom.setAttribute('aria-haspopup', true);
        }
    },

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

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

    // private
    setButtonCls: function() {
        var me = this,
            el = me.el,
            cls = [];

        if (me.useSetClass) {
            if (!Ext.isEmpty(me.oldCls)) {
                me.removeClsWithUI(me.oldCls);
                me.removeClsWithUI(me.pressedCls);
            }
            
            // Check whether the button has an icon or not, and if it has an icon, what is th 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');
            }
            
            me.oldCls = cls;
            me.addClsWithUI(cls);
            me.addClsWithUI(me.pressed ? me.pressedCls : null);
        }
    },
    
    // private
    onRender: function(ct, position) {
        // classNames for the button
        var me = this,
            repeater, btn;
            
        // Apply the renderData to the template args
        Ext.applyIf(me.renderData, me.getTemplateArgs());

        // Extract the button and the button wrapping element
        Ext.applyIf(me.renderSelectors, {
            btnEl  : me.href ? 'a' : 'button',
            btnWrap: 'em',
            btnInnerEl: '.' + me.baseCls + '-inner'
        });
        
        if (me.scale) {
            me.ui = me.ui + '-' + me.scale;
        }

        // Render internal structure
        me.callParent(arguments);

        // If it is a split button + has a toolip for the arrow
        if (me.split && me.arrowTooltip) {
            me.arrowEl.dom[me.tooltipType] = me.arrowTooltip;
        }

        // Add listeners to the focus and blur events on the element
        me.mon(me.btnEl, {
            scope: me,
            focus: me.onFocus,
            blur : me.onBlur
        });

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

        if (me.icon) {
            me.setIcon(me.icon);
        }

        if (me.iconCls) {
            me.setIconCls(me.iconCls);
        }

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

        // Add the mouse events to the button
        if (me.handleMouseEvents) {
            me.mon(btn, {
                scope: me,
                mouseover: me.onMouseOver,
                mouseout: me.onMouseOut,
                mousedown: me.onMouseDown
            });

            if (me.split) {
                me.mon(btn, {
                    mousemove: me.onMouseMove,
                    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 = Ext.create('Ext.util.KeyMap', me.el, {
                key: Ext.EventObject.DOWN,
                handler: me.onDownKey,
                scope: me
            });
        }

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

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

    /**
     * <p>This method returns an object which provides substitution parameters for the {@link #renderTpl XTemplate} used
     * to create this Button's DOM structure.</p>
     * <p>Instances or subclasses which use a different Template to create a different DOM structure may need to provide their
     * own implementation of this method.</p>
     * <p>The default implementation which provides data for the default {@link #template} returns an Object containing the
     * following properties:</p><div class="mdetail-params"><ul>
     * <li><code>type</code> : The &lt;button&gt;'s {@link #type}</li>
     * <li><code>splitCls</code> : A CSS class to determine the presence and position of an arrow icon. (<code>'x-btn-arrow'</code> or <code>'x-btn-arrow-bottom'</code> or <code>''</code>)</li>
     * <li><code>cls</code> : A CSS class name applied to the Button's main &lt;tbody&gt; element which determines the button's scale and icon alignment.</li>
     * <li><code>text</code> : The {@link #text} to display ion the Button.</li>
     * <li><code>tabIndex</code> : The tab index within the input flow.</li>
     * </ul></div>
     * @return {Array} Substitution data for a Template.
    */
    getTemplateArgs: function() {
        var me = this,
            persistentPadding = me.getPersistentBtnPadding(),
            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(),
            target   : me.target || '_blank',
            type     : me.type,
            splitCls : me.getSplitCls(),
            cls      : me.cls,
            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;
        return me.href ? Ext.urlAppend(me.href, me.params + Ext.Object.toQueryString(Ext.apply(Ext.apply({}, me.baseParams)))) : false;
    },

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

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

    // private
    afterRender: function() {
        var me = this;
        me.useSetClass = true;
        me.setButtonCls();
        me.doc = Ext.getDoc();
        this.callParent(arguments);
    },

    /**
     * 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,
            btnInnerEl = me.btnInnerEl;
        if (btnInnerEl) {
            // Remove the previous iconCls from the button
            btnInnerEl.removeCls(me.iconCls);
            btnInnerEl.addCls(cls || '');
            me.setButtonCls();
        }
        me.iconCls = cls;
        return me;
    },

    /**
     * Sets the tooltip for this Button.
     * @param {String/Object} tooltip. This may be:<div class="mdesc-details"><ul>
     * <li><b>String</b> : A string to be used as innerHTML (html tags are accepted) to show in a tooltip</li>
     * <li><b>Object</b> : A configuration object for {@link Ext.tip.QuickTipManager#register}.</li>
     * </ul></div>
     * @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('data-' + this.tooltipType, tooltip);
            }
        } else {
            me.tooltip = tooltip;
        }
        return me;
    },

    // 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.btnEl, me.btnInnerEl, me.menu);
        }
        Ext.destroy(me.repeater);
    },

    // 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;
            delete me.btnEl;
            delete me.btnInnerEl;
            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 (optional) The scope (<code>this</code> 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.el) {
            me.btnInnerEl.update(text || '&#160;');
            me.setButtonCls();
        }
        me.doComponentLayout();
        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,
            btnInnerEl = me.btnInnerEl;
        me.icon = icon;
        if (btnInnerEl) {
            btnInnerEl.setStyle('background-image', icon ? 'url(' + icon + ')': '');
            me.setButtonCls();
        }
        return me;
    },

    /**
     * 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 (optional) Force a particular state
     * @param {Boolean} supressEvent (optional) 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.btnEl.dom.setAttribute('aria-pressed', state);
            me.pressed = state;
            if (!suppressEvent) {
                me.fireEvent('toggle', me, state);
                Ext.callback(me.toggleHandler, me.scope || me, [me, state]);
            }
        }
        return me;
    },

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

            me.menu.showBy(me.el, me.menuAlign);
        }
        return me;
    },

    /**
     * Hide 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) {
            if (me.enableToggle && (me.allowDepress !== false || !me.pressed)) {
                me.toggle();
            }
            if (me.menu && !me.hasVisibleMenu() && !me.ignoreNextClick) {
                me.showMenu();
            }
            me.fireEvent('click', me, e);
            if (me.handler) {
                me.handler.call(me.scope || me, me, e);
            }
            me.onBlur();
        }
    },

    /**
     * @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 && me.frameSize[side] || 0);
        }
        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);
        
        me.removeClsWithUI('disabled');

        return me;
    },

    // inherit docs
    disable : function(silent) {
        var me = this;
        
        me.callParent(arguments);
        
        me.addClsWithUI('disabled');

        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
    onFocus: function(e) {
        var me = this;
        if (!me.disabled) {
            me.addClsWithUI(me.focusCls);
        }
    },

    // private
    onBlur: function(e) {
        var me = this;
        me.removeClsWithUI(me.focusCls);
    },

    // 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 Array [top, right, bottom, left]
     */
    getPersistentBtnPadding: function() {
        var cls = Ext.button.Button,
            padding = cls.persistentPadding,
            btn, leftTop, btnEl, btnInnerEl;

        if (!padding) {
            padding = cls.persistentPadding = [0, 0, 0, 0]; //set early to prevent recursion

            if (!Ext.isIE) { //short-circuit IE as it sometimes gives false positive for padding
                // Create auto-size button offscreen and measure its insides
                btn = Ext.create('Ext.button.Button', {
                    renderTo: Ext.getBody(),
                    text: 'test',
                    style: 'position:absolute;top:-999px;'
                });
                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();
            }
        }

        return padding;
    }

}, function() {
    var groups = {},
        g, i, l;

    function toggleGroup(btn, state) {
        if (state) {
            g = groups[btn.toggleGroup];
            for (i = 0, l = g.length; i < l; 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 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;
        }
    };
});