Displays a single-selection tree, a multi-selection tree, and a checkbox tree
//Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* Displays a single-selection tree, a multi-selection tree, and a checkbox tree
*/
public class SWTTreeExample {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("TreeExample");
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
private void createContents(Composite composite) {
// Set the single-selection tree in the upper left,
// the multi-selection tree in the upper right,
// and the checkbox tree across the bottom.
// To do this, create a 1x2 grid, and in the top
// cell, a 2x1 grid.
composite.setLayout(new GridLayout(1, true));
Composite top = new Composite(composite, SWT.NONE);
GridData data = new GridData(GridData.FILL_BOTH);
top.setLayoutData(data);
top.setLayout(new GridLayout(2, true));
Tree single = new Tree(top, SWT.SINGLE | SWT.BORDER);
data = new GridData(GridData.FILL_BOTH);
single.setLayoutData(data);
fillTree(single);
Tree multi = new Tree(top, SWT.MULTI | SWT.BORDER);
data = new GridData(GridData.FILL_BOTH);
multi.setLayoutData(data);
fillTree(multi);
Tree check = new Tree(composite, SWT.CHECK | SWT.BORDER);
data = new GridData(GridData.FILL_BOTH);
check.setLayoutData(data);
fillTree(check);
}
/**
* Helper method to fill a tree with data
*
* @param tree the tree to fill
*/
private void fillTree(Tree tree) {
// Turn off drawing to avoid flicker
tree.setRedraw(false);
// Create five root items
for (int i = 0; i < 5; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Root Item " + i);
// Create three children below the root
for (int j = 0; j < 3; j++) {
TreeItem child = new TreeItem(item, SWT.NONE);
child.setText("Child Item " + i + " - " + j);
// Create three grandchildren under the child
for (int k = 0; k < 3; k++) {
TreeItem grandChild = new TreeItem(child, SWT.NONE);
grandChild.setText("Grandchild Item " + i + " - " + j + " - " + k);
}
}
}
// Turn drawing back on!
tree.setRedraw(true);
}
/**
* The entry point for the application
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new SWTTreeExample().run();
}
}
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