Plugin development: composite of button in a view plugin - eclipse

Question

I am using zest to create plugin that show graph. I am trying to create button that refresh the plugin. The button is working, and I see the graph in the view also. But, the button is taking a lot of space in the view, and limit the place for the graph.I want that the button want limit the graph place.. How can I fix it? Thanks]
public void createPartControl(Composite parent) {
//create refresh button
Composite container = new Composite(parent, SWT.NONE);
container.setLayout(new GridLayout(1, false));
Button btnMybutton = new Button(container, SWT.PUSH);
btnMybutton.setBounds(0, 10, 75, 25);
btnMybutton.setText("Refresh Graph");
btnMybutton.addSelectionListener(new SelectionListener() {
#Override
public void widgetSelected(SelectionEvent e) {
init();
}
#Override
public void widgetDefaultSelected(SelectionEvent e) {
// TODO Auto-generated method stub
}
});
// Graph will hold all other objects
graph = new Graph(parent, SWT.NONE);
}

Answer 1

If you want to show the button on top of the graph, you should use a FormLayout instead of a GridLayout:
public void createPartControl(Composite parent) {
//create refresh button
Composite container = new Composite(parent, SWT.NONE);
container.setLayout(new FormLayout()); // Use FormLayout instead of GridLayout
Button btnMybutton = new Button(container, SWT.PUSH);
// btnMybutton.setBounds(0, 10, 75, 25); This line is unnecessary
// Assign the right FormData to the button
FormData formData = new FormData();
formData.left = new FormAttachment(0, 5);
formData.top = new FormAttachment(0, 5);
btnMybutton.setLayoutData(formData);
btnMybutton.setText("Refresh Graph");
// Use SelectionAdapter instead of SelectionListener
// (it's not necessary but saves a few lines of code)
btnMybutton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
init();
}
});
// Graph will hold all other objects
graph = new Graph(container, SWT.NONE); // Note parent changed to container
// Assignt the right FormData to the graph
FormData formData2 = new FormData();
formData2.left = new FormAttachment(0, 0);
formData2.top = new FormAttachment(0, 0);
formData2.right = new FormAttachment(100, 0);
formData2.bottom = new FormAttachment(100, 0);
graph.setLayoutData(formData2);
}