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?

I have this example from

.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.

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?

I have this example from

http://dev.sencha./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.

• javascript
• html
• css
• extjs

• why do yo need to write a custom layout? what don't you did with ExtJS's layouts or what is the specific case for you. I am asking this because, I have done many ExtJS based web applications, and when you are using ExtJS, you have a enormous power, you can do almost everything easily without worrying about new layouts or ponents. – Fatih Acet Commented Mar 23, 2011 at 9:00
• I just want to create layout that will place items in the vertical and horisontall center, in my applicaton i will use this layout VERY offten so i really need it... am i only one who want to use this layout? o_O – obenjiro Commented Mar 23, 2011 at 9:35
• "place items in the vertical and horisontall center" does not mean anything - at least for me - if you detail the point more clearly - a basic draw might be the best way -, i will try to help you. – Fatih Acet Commented Mar 23, 2011 at 12:44
• heres an example, open this dev.sencha./deploy/dev/examples/layout-browser/… then go to Custom Layouts - Center... ok so i want someting like this, but layout have to align horisontal and vertical center... not only horisontal... – obenjiro Commented Mar 23, 2011 at 13:26

3 Answers 3

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./deploy/dev/examples/layout-browser/layout-browser.html

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;

Ext.layout.ContainerLayout (the base class for layouts) has a doLayout method that triggers your container rendering.

In the case of FitLayout, its overriden and it calls a custom setItemSize function who calls the native setSize for the first container item (or the selected item if any), to fit the container size (maximize i guess).

Check also these custom layouts : http://layoutscroll.demo.revolunet./

Ext.create('Ext.container.Viewport', {
        layout: {
            type: 'hbox',
            pack: 'center',
            align: 'middle'
        },
        items: [
            {
                html: 'Hello World'
            }
        ]
    });