Its been a long week

-

Comments

Post a Comment

Popular posts from this blog

Vaadin - GRID Component

-
Image
Introduction Vaadin 7.4 was recently released and it includes a new component called the GRID . It represents a 'Spreadsheet" type model from a UI perspective, however I think it lacks a lot of features you would expect from this type of component. Maybe this component will evolve over time and it will begin to have the functions that you expect from a spreadsheet. ( note: there is a commercial add on called the Spreadsheet from Vaadin ) Use Case The use case I am demonstrating below is a simple grid showing projected sales of Widgets over a five year period. Creation Creating a Grid is very simple and you have numerous options for sizing on the page. In the example below I setting it across the page. The Grid rows can be selected for editing, you can select single or multiple rows in a single action. myGrid = new Grid(); myGrid.setSizeFull(); myGrid.setSelectionMode(SelectionMode.SINGLE); Container Backing Similar to many other Vaadin componen...
Read more

Web Cam and Vaadin

-
A very interesting Web Cam Add On is available from the Vaadin Add On site . Here is a simple recipe for making it work. Create a split panel and add the Web Cam to the left hand side of the panel. splitPanel = new HorizontalSplitPanel(); splitPanel.setSizeFull(); VerticalLayout detailsLayout = new VerticalLayout(); detailsLayout.setSpacing(true); detailsLayout.setSizeFull(); // Create the webcam and assign a receiver. final Webcam webcam = new Webcam(); webcam.setWidth("600px"); detailsLayout.addComponent(webcam); detailsLayout.setComponentAlignment(webcam, Alignment.TOP_LEFT); Create a receiver which creates a temporary file with a jpeg extension. webcam.setReceiver(new Upload.Receiver() { @Override public OutputStream receiveUpload(String filename, String mimeType) { try { targetFile = File.createTemp...
Read more

Filtering a Vaadin SQL Container

-
My previous post concerning the Vaadin SQL Contanier covered how to create a SQL Container and a Table Query using the Vaadin SQL Container Add On. In this post I will give a very short overview on how to filter the results of a Table Query. A filter can be applied to a SQL Container so that the results of that Table Query can be narrowed to a specific set of rows within the table. For example, lets assume you have created a Table Query on an address table within your database. TableQuery q = new TableQuery("address", connectionPool); Your requirement is to filter the data within that Table Query to a specific suburb, street and postcode. To achieve that requirement you create three filters using the Compare.Equal object. The values for suburb, postcode and street are passed in as parameters. Compare.Equal suburbFilter = new Compare.Equal("suburb", suburb); Compare.Equal postcodeFilter = new Compare.Equal("postcode", postcode); Compare....
Read more