GWT show case implementation

If you are looking for GWT show case code implementation go to this url:
https://gwt.googlesource.com/gwt/+/master/samples/showcase/src/com/google/gwt/sample/showcase/client

GWT run configurations in Idea

 

-Xmx1024m -XX:MaxPermSize=512m

 

-Xmx1024m -XX:MaxPermSize=512m -Dgwt.codeserver.port=9876

How to install Idea on Ubuntu

If you want to install Idea on Ubuntu follow this instruction:

 

https://www.jetbrains.com/idea/help/basics-and-installation.html#d1525707e18677

Lazy Load Data in a GWT DataGrid

http://stackoverflow.com/questions/11997130/lazy-load-data-in-a-gwt-datagrid

private static class MyDataGrid<T> extends DataGrid {
    public ScrollPanel getScrollPanel() {
        HeaderPanel header = (HeaderPanel) getWidget();
        return (ScrollPanel) header.getContentWidget();
    }
}

private MyDataGrid<MyDataType> myDataGrid;
private int incrementSize = 20;
private int lastScrollPos = 0;


myDataGrid = new MyDataGrid<MyDataType>();



myDataGrid.getScrollPanel().addScrollHandler(new ScrollHandler(){

    @Override
    public void onScroll(ScrollEvent event) {

        int oldScrollPos = lastScrollPos;
        lastScrollPos = myDataGrid.getScrollPanel().getVerticalScrollPosition();

        // If scrolling up, ignore the event.
        if (oldScrollPos >= lastScrollPos) {
            return;
        }

        //Height of grid contents (including outside the viewable area) - height of the scroll panel
        int maxScrollTop = myDataGrid.getScrollPanel().getWidget().getOffsetHeight() - 
                           myDataGrid.getScrollPanel().getOffsetHeight();

        if(lastScrollPos >= maxScrollTop) {
            myDataGrid.setVisibleRange(0,myDataGrid.getVisibleRange().getLength()+incrementSize);
        }
    }
});

How to createw and fire GWT handler

public class MyEvent extends GwtEvent<MyEvent.MyHandler> {

    private static Type<MyHandler> TYPE;
    public static Type<LegalCreatedHandler> getType() {
        if (TYPE == null) {
            TYPE = new Type<MyHandler>();        }
        return TYPE;    }

    @Override    public Type<MyHandler> getAssociatedType() {
        return (Type) TYPE;    }

    @Override    protected void dispatch(MyEvent.MyHandler handler) {
        handler.onMyEvent(this);    }

    public interface MyHandler extends EventHandler {
        void onMyEvent(MyEvent event);
    }

}

////fire event from your class

fire(new MyEvent());

////ensure that HandlerManager is not null.

///implement handler and register this handler in class that handle this event

this.addHandler(this, MyEvent.getType());

10 thing you don't know about Java (in Russian)

http://habrahabr.ru/post/253787/

GWT DataGrid refresh on column sorting

GWT DataGrid needs refresh on ListDataProvider when you do sort on column:

sortHandler = new ColumnSortEvent.ListHandler<Client>(dataProvider.getList()) {

    @Override    public void onColumnSort(ColumnSortEvent event) {
        super.onColumnSort(event);        dataProvider.refresh();    }

};

Linux Ubuntu - Instal and run GWT plugin Firefox 24

https://support.google.com/chrome/answer/95346?hl=en

Linux Ubuntu - where to store all application as Program Files in Windows

In Linux Ubuntu store all your applications under:

/usr/local

Create new directory in it e.g. apps and keep all your downloaded third-party apps there.

Linux Ubuntu - What does the asterisk mean after a filename

The asterisk after a filename means in Linux that that file is executable