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== A few terms that are used frequently when discussing layouts ==

<OL><LI>Client area: the size of the composite"s bounds minus its trim.</LI><LI>Margins: the number of pixels placed on an edge of the layout.</LI><LI>Spacing: the number of pixels between the edges of children of a composite.</LI><LI>Preferred size: best-display size.</LI></OL>

== Laying Out Children of a Composite ==



<source lang="java">
public void layout(boolean changed)</source>



== Layouts ==

<p>A layout can be used to control the position and size of children of a composite.
Four standard layouts and one custom layout provided in SWT:</p>
<OL><LI>FillLayout</LI><LI>RowLayout</LI><LI>GridLayout</LI><LI>FormLayout</LI><LI>StackLayout</LI></OL>

== Layout term: bounds, client area ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class LayoutTerm {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
System.out.println("Bounds: " + shell.getBounds());
System.out.println("Client area: " + shell.getClientArea());
shell.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
RowLayout rowLayout = new RowLayout();
shell.setLayout(rowLayout);
Button button1 = new Button(shell, SWT.PUSH);
button1.setText("button1");
Button button2 = new Button(shell, SWT.PUSH);
button2.setText("button2");
Button button3 = new Button(shell, SWT.PUSH);
button3.setText("button33333333333333333333333333333333333333");
shell.pack();
shell.open();
System.out.println("button1: " + button1.getBounds());
System.out.println("button2: " + button2.getBounds());
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== Setting Layouts ==



<source lang="java">
public Layout getLayout()
public void setLayout(Layout layout)</source>



<p>By default, a composite does not have any layout.</p>

== Using Layout Data Objects to control layout ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class LayoutDataControlLayout {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout()); // Only with GridLayout you can use GridData
Text text = new Text(shell, SWT.SINGLE|SWT.BORDER);
text.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL));

shell.setSize(450, 100);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>

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