    /*
     * These classes are private internal classes
     */
    YAHOO.ext.CenterLayoutRegion = function(mgr, config){
        YAHOO.ext.CenterLayoutRegion.superclass.constructor.call(this, mgr, config, 'center');
        this.visible = true;
        this.minWidth = config.minWidth || 20;
        this.minHeight = config.minHeight || 20;
    };

    YAHOO.extendX(YAHOO.ext.CenterLayoutRegion, YAHOO.ext.LayoutRegion, {
        hide : function(){
            // center panel can't be hidden
        },

        show : function(){
            // center panel can't be hidden
        },

        getMinWidth: function(){
            return this.minWidth;
        },

        getMinHeight: function(){
            return this.minHeight;
        }
    });

    YAHOO.ext.NorthLayoutRegion = function(mgr, config){
        YAHOO.ext.NorthLayoutRegion.superclass.constructor.call(this, mgr, config, 'north', 'n-resize');
        if(this.split){
            this.split.placement = YAHOO.ext.SplitBar.TOP;
            this.split.orientation = YAHOO.ext.SplitBar.VERTICAL;
            this.split.el.addClass('ylayout-split-v');
        }
        if(typeof config.initialSize != 'undefined'){
            this.el.setHeight(config.initialSize);
        }
    };
    YAHOO.extendX(YAHOO.ext.NorthLayoutRegion, YAHOO.ext.SplitLayoutRegion, {
        getBox : function(){
            if(this.collapsed){
                return this.collapsedEl.getBox();
            }
            var box = this.el.getBox();
            if(this.split){
                box.height += this.split.el.getHeight();
            }
            return box;
        },

        updateBox : function(box){
            if(this.split && !this.collapsed){
                box.height -= this.split.el.getHeight();
                this.split.el.setLeft(box.x);
                this.split.el.setTop(box.y+box.height);
                this.split.el.setWidth(box.width);
            }
            if(this.collapsed){
                this.el.setWidth(box.width);
                var bodyWidth = box.width - this.el.getBorderWidth('rl');
                this.bodyEl.setWidth(bodyWidth);
                if(this.activePanel && this.panelSize){
                    this.activePanel.setSize(bodyWidth, this.panelSize.height);
                }
            }
            YAHOO.ext.NorthLayoutRegion.superclass.updateBox.call(this, box);
        }
    });

    YAHOO.ext.SouthLayoutRegion = function(mgr, config){
        YAHOO.ext.SouthLayoutRegion.superclass.constructor.call(this, mgr, config, 'south', 's-resize');
        if(this.split){
            this.split.placement = YAHOO.ext.SplitBar.BOTTOM;
            this.split.orientation = YAHOO.ext.SplitBar.VERTICAL;
            this.split.el.addClass('ylayout-split-v');
        }
        if(typeof config.initialSize != 'undefined'){
            this.el.setHeight(config.initialSize);
        }
    };
    YAHOO.extendX(YAHOO.ext.SouthLayoutRegion, YAHOO.ext.SplitLayoutRegion, {
        getBox : function(){
            if(this.collapsed){
                return this.collapsedEl.getBox();
            }
            var box = this.el.getBox();
            if(this.split){
                var sh = this.split.el.getHeight();
                box.height += sh;
                box.y -= sh;
            }
            return box;
        },

        updateBox : function(box){
            if(this.split && !this.collapsed){
                var sh = this.split.el.getHeight();
                box.height -= sh;
                box.y += sh;
                this.split.el.setLeft(box.x);
                this.split.el.setTop(box.y-sh);
                this.split.el.setWidth(box.width);
            }
            if(this.collapsed){
                this.el.setWidth(box.width);
                var bodyWidth = box.width - this.el.getBorderWidth('rl');
                this.bodyEl.setWidth(bodyWidth);
                if(this.activePanel && this.panelSize){
                    this.activePanel.setSize(bodyWidth, this.panelSize.height);
                }
            }
            YAHOO.ext.SouthLayoutRegion.superclass.updateBox.call(this, box);
        }
    });

    YAHOO.ext.EastLayoutRegion = function(mgr, config){
        YAHOO.ext.EastLayoutRegion.superclass.constructor.call(this, mgr, config, 'east', 'e-resize');
        if(this.split){
            this.split.placement = YAHOO.ext.SplitBar.RIGHT;
            this.split.orientation = YAHOO.ext.SplitBar.HORIZONTAL;
            this.split.el.addClass('ylayout-split-h');
        }
        if(typeof config.initialSize != 'undefined'){
            this.el.setWidth(config.initialSize);
        }
    };
    YAHOO.extendX(YAHOO.ext.EastLayoutRegion, YAHOO.ext.SplitLayoutRegion, {
        getBox : function(){
            if(this.collapsed){
                return this.collapsedEl.getBox();
            }
            var box = this.el.getBox();
            if(this.split){
                var sw = this.split.el.getWidth();
                box.width += sw;
                box.x -= sw;
            }
            return box;
        },

        updateBox : function(box){
            if(this.split && !this.collapsed){
                var sw = this.split.el.getWidth();
                box.width -= sw;
                this.split.el.setLeft(box.x);
                this.split.el.setTop(box.y);
                this.split.el.setHeight(box.height);
                box.x += sw;
            }
            if(this.collapsed){
                this.el.setHeight(box.height);
                var bodyHeight = this.config.titlebar ? box.height - (this.titleEl.getHeight()||0) : box.height;
                bodyHeight -= this.el.getBorderWidth('tb');
                this.bodyEl.setHeight(bodyHeight);
                if(this.activePanel && this.panelSize){
                    this.activePanel.setSize(this.panelSize.width, bodyHeight);
                }
            }
            YAHOO.ext.EastLayoutRegion.superclass.updateBox.call(this, box);
        }
    });

    YAHOO.ext.WestLayoutRegion = function(mgr, config){
        YAHOO.ext.WestLayoutRegion.superclass.constructor.call(this, mgr, config, 'west', 'w-resize');
        if(this.split){
            this.split.placement = YAHOO.ext.SplitBar.LEFT;
            this.split.orientation = YAHOO.ext.SplitBar.HORIZONTAL;
            this.split.el.addClass('ylayout-split-h');
        }
        if(typeof config.initialSize != 'undefined'){
            this.el.setWidth(config.initialSize);
        }
    };
    YAHOO.extendX(YAHOO.ext.WestLayoutRegion, YAHOO.ext.SplitLayoutRegion, {
        getBox : function(){
            if(this.collapsed){
                return this.collapsedEl.getBox();
            }
            var box = this.el.getBox();
            if(this.split){
                box.width += this.split.el.getWidth();
            }
            return box;
        },

        updateBox : function(box){
            if(this.split && !this.collapsed){
                var sw = this.split.el.getWidth();
                box.width -= sw;
                this.split.el.setLeft(box.x+box.width);
                this.split.el.setTop(box.y);
                this.split.el.setHeight(box.height);
            }
            if(this.collapsed){
                this.el.setHeight(box.height);
                var bodyHeight = this.config.titlebar ? box.height - (this.titleEl.getHeight()||0) : box.height;
                bodyHeight -= this.el.getBorderWidth('tb');
                this.bodyEl.setHeight(bodyHeight);
                if(this.activePanel && this.panelSize){
                    this.activePanel.setSize(this.panelSize.width, bodyHeight);
                }
            }
            YAHOO.ext.WestLayoutRegion.superclass.updateBox.call(this, box);
        }
    });

Copyright © 2006 Jack Slocum. All rights reserved.