Here I am at my new workplace. Next 8 months I will be working in Eclipse team, on migration of SWT from GTK2 to GTK3.
If these words does not tell you much, don’t worry, I am pretty much in the same situation, but what I am going to do in the next couple of days is to explore this issue as much as I can, and write down my findings here.
Let’s start with SWT. My first stop in finding info about SWT was here: http://www.eclipsepluginsite.com/swt.html
After reading introductory chapter, I have found out that SWT stands for Standard Widget Toolkit. As I have understood from the reading, SWT is a collection of tools, intended for creating stand alone java applications or eclipse plugins with basic UI components (such as buttons, trees etc). What is special about SWT, is that it uses native OS components, so when you build application with SWT it feels like this application is intended for the particular OS.
I decided to build a simple application using one of the examples provided in the reading.
Simple SWT Application
/*
* Name: BlogButton.java
* Description: SWT button on click changes text and background color
*
* Author: Anatoly Spektor
* Date: May 14,2012
* */
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.*;
public class BlogButton {
public static void main(String[] args) {
// creating new object of Display myDisplay
//in SWT Display manages connection between app and OS
final Display myDisplay = new Display();
// creating instance of shell - which is actual window
Shell myShell = new Shell(myDisplay);
// setting window title
myShell.setText("Window Title");
//setting size
myShell.setSize(400,400);
// setting layout
myShell.setLayout(new FillLayout());
// creating button object in myShell
// passing PUSH behaviour
final Button button = new Button(myShell, SWT.PUSH);
// passing button label
button.setText("Show Blog URL");
// adding event listener to button
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
//on selected change button label
button.setText("myprogrammingblog.com");
// set text color to red
button.setForeground(myDisplay.getSystemColor(SWT.COLOR_RED));
}
});
// open - pushes shell on the top of drawing order and makes it visible
myShell.open();
// checking if shell is Disposed or not
while (!myShell.isDisposed()) {
// check if there is work to do for this shell and if not
// put it in sleep mode so no CPU is consumed
if (!myDisplay.readAndDispatch()) myDisplay.sleep();
}
// disposing an object
myDisplay.dispose();
}
}
Output:
Before Click:
After Click:
