button.js

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        this.el.remove();
    },

    // private
    autoWidth : function(){
        if(this.el){
            this.el.setWidth("auto");
            if(Ext.isIE7 && Ext.isStrict){
                var ib = this.el.child('button');
                if(ib && ib.getWidth() > 20){
                    ib.clip();
                    ib.setWidth(Ext.util.TextMetrics.measure(ib, this.text).width+ib.getFrameWidth('lr'));
                }
            }
            if(this.minWidth){
                if(this.hidden){
                    this.el.beginMeasure();
                }
                if(this.el.getWidth() < this.minWidth){
                    this.el.setWidth(this.minWidth);
                }
                if(this.hidden){
                    this.el.endMeasure();
                }
            }
        }
    },

    /**
     * Assigns this button's click handler
     * @param {Function} handler The function to call when the button is clicked
     * @param {Object} scope (optional) Scope for the function passed in
     */
    setHandler : function(handler, scope){
        this.handler = handler;
        this.scope = scope;  
    },
    
    /**
     * Sets this button's text
     * @param {String} text The button text
     */
    setText : function(text){
        this.text = text;
        if(this.el){
            this.el.child("td.x-btn-center button.x-btn-text").update(text);
        }
        this.autoWidth();
    },
    
    /**
     * Gets the text for this button
     * @return {String} The button text
     */
    getText : function(){
        return this.text;  
    },
    
    /**
     * Show this button
     */
    show: function(){
        this.hidden = false;
        if(this.el){
            this[this.hideParent? 'parentEl' : 'el'].setStyle("display", "");
        }
    },
    
    /**
     * Hide this button
     */
    hide: function(){
        this.hidden = true;
        if(this.el){
            this[this.hideParent? 'parentEl' : 'el'].setStyle("display", "none");
        }
    },
    
    /**
     * Convenience function for boolean show/hide
     * @param {Boolean} visible True to show, false to hide
     */
    setVisible: function(visible){
        if(visible) {
            this.show();
        }else{
            this.hide();
        }
    },
    
    /**
     * If a state it passed, it becomes the pressed state otherwise the current state is toggled.
     * @param {Boolean} state (optional) Force a particular state
     */
    toggle : function(state){
        state = state === undefined ? !this.pressed : state;
        if(state != this.pressed){
            if(state){
                this.el.addClass("x-btn-pressed");
                this.pressed = true;
                this.fireEvent("toggle", this, true);
            }else{
                this.el.removeClass("x-btn-pressed");
                this.pressed = false;
                this.fireEvent("toggle", this, false);
            }
            if(this.toggleHandler){
                this.toggleHandler.call(this.scope || this, this, state);
            }
        }
    },
    
    /**
     * Focus the button
     */
    focus : function(){
        this.el.child('button:first').focus();
    },
    
    /**
     * Disable this button
     */
    disable : function(){
        if(this.el){
            this.el.addClass("x-btn-disabled");
        }
        this.disabled = true;
    },
    
    /**
     * Enable this button
     */
    enable : function(){
        if(this.el){
            this.el.removeClass("x-btn-disabled");
        }
        this.disabled = false;
    },

    /**
     * Convenience function for boolean enable/disable
     * @param {Boolean} enabled True to enable, false to disable
     */
    setDisabled : function(v){
        this[v !== true ? "enable" : "disable"]();
    },

    // private
    onClick : function(e){
        if(e){
            e.preventDefault();
        }
        if(e.button != 0){
            return;
        }
        if(!this.disabled){
            if(this.enableToggle){
                this.toggle();
            }
            if(this.menu && !this.menu.isVisible()){
                this.menu.show(this.el, this.menuAlign);
            }
            this.fireEvent("click", this, e);
            if(this.handler){
                this.el.removeClass("x-btn-over");
                this.handler.call(this.scope || this, this, e);
            }
        }
    },
    // private
    onMouseOver : function(e){
        if(!this.disabled){
            this.el.addClass("x-btn-over");
            this.fireEvent('mouseover', this, e);
        }
    },
    // private
    onMouseOut : function(e){
        if(!e.within(this.el,  true)){
            this.el.removeClass("x-btn-over");
            this.fireEvent('mouseout', this, e);
        }
    },
    // private
    onFocus : function(e){
        if(!this.disabled){
            this.el.addClass("x-btn-focus");
        }
    },
    // private
    onBlur : function(e){
        this.el.removeClass("x-btn-focus");
    },
    // private
    onMouseDown : function(e){
        if(!this.disabled && e.button == 0){
            this.el.addClass("x-btn-click");
            Ext.get(document).on('mouseup', this.onMouseUp, this);
        }
    },
    // private
    onMouseUp : function(e){
        if(e.button == 0){
            this.el.removeClass("x-btn-click");
            Ext.get(document).un('mouseup', this.onMouseUp, this);
        }
    },
    // private
    onMenuShow : function(e){
        this.el.addClass("x-btn-menu-active");
    },
    // private
    onMenuHide : function(e){
        this.el.removeClass("x-btn-menu-active");
    }   
});

// Private utility class used by Button
Ext.ButtonToggleMgr = function(){
   var groups = {};
   
   function toggleGroup(btn, state){
       if(state){
           var g = groups[btn.toggleGroup];
           for(var i = 0, l = g.length; i < l; i++){
               if(g[i] != btn){
                   g[i].toggle(false);
               }
           }
       }
   }
   
   return {
       register : function(btn){
           if(!btn.toggleGroup){
               return;
           }
           var g = groups[btn.toggleGroup];
           if(!g){
               g = groups[btn.toggleGroup] = [];
           }
           g.push(btn);
           btn.on("toggle", toggleGroup);
       },
       
       unregister : function(btn){
           if(!btn.toggleGroup){
               return;
           }
           var g = groups[btn.toggleGroup];
           if(g){
               g.remove(btn);
               btn.un("toggle", toggleGroup);
           }
       }
   };
}();