Question

I want to write my own layout.. (like vbox, border and so one)… What i want to do is to create layout that will place it’s content in the middle (verticall – middle, horisontal – middle)..

Is there some one who could show me how this control will look like in extJs or can provide some links that may be usefull?

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I have this example from

http://dev.sencha.com/deploy/dev/examples/layout-browser/layout-browser.html

Ext.ux.layout.CenterLayout = Ext.extend(Ext.layout.FitLayout, {
// private
setItemSize : function(item, size){
    this.container.addClass('ux-layout-center');
    item.addClass('ux-layout-center-item');
    if(item && size.height > 0){
        if(item.width){
            size.width = item.width;
        }
        item.setSize(size);
    }
}
});

Ext.Container.LAYOUTS['ux.center'] = Ext.ux.layout.CenterLayout;

But it gives me more questions than answers.. What is setItemSize How it works? When? Why? ect. What is item.setSize called for? How it works? When? Why? ect.

Answer 1

check the examples of ExtJS 3, there is an Ext.ux.Layout.CenterLayout under custom layouts there already, maybe a good point to start?

http://dev.sencha.com/deploy/dev/examples/layout-browser/layout-browser.html

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Edit: Try this layout user extension, it centers an item in the horizontal and vertical center of it’s container

Ext.ns('Ext.ux.layout');

Ext.ux.layout.CenterLayout = Ext.extend(Ext.layout.ContainerLayout, {
    monitorResize:true,
    type: 'ux.center',
    getLayoutTargetSize : function() {
        var target = this.container.getLayoutTarget();
        if (!target) {
            return {};
        }
        return target.getStyleSize();
    },
    onLayout : function(ct, target){
        Ext.ux.layout.CenterLayout.superclass.onLayout.call(this, ct, target);
        if(!ct.collapsed){
            this.setItemSize(this.activeItem || ct.items.itemAt(0), this.getLayoutTargetSize());
        }
    },
    setItemSize : function(item, size){
        var left = (size.width - item.getWidth()) / 2;
        var top  = (size.height - item.getHeight()) / 2;

        var pos = Ext.apply(item.getEl().getPositioning(), {
            position : 'absolute',
            left     : left,
            top      : top
        });
        item.getEl().setPositioning(pos);
    }
});
Ext.Container.LAYOUTS['ux.center'] = Ext.ux.layout.CenterLayout;