ShowCTabFolder.java Source code

Introduction

Here is the source code for ShowCTabFolder.java

Source

//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.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * This class demonstrates CTabFolder
 */
public class ShowCTabFolder {
    // Since CTabFolder does not have a getInsertMark() method,
    // store the value so we can keep track of it
    private int insertMark = -1;
    private CTabFolder tabFolder;

    /**
     * Runs the application
     */
    public void run() {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Show CTabFolder");
        createContents(shell);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }

    /**
     * Creates the window's contents
     * 
     * @param shell the parent shell
     */
    private void createContents(Shell shell) {
        shell.setLayout(new GridLayout(1, true));

        // Create the buttons to create tabs
        Composite composite = new Composite(shell, SWT.NONE);
        composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        composite.setLayout(new RowLayout());
        createButtons(composite);

        // Create the tabs
        tabFolder = new CTabFolder(shell, SWT.TOP);
        tabFolder.setBorderVisible(true);
        tabFolder.setLayoutData(new GridData(GridData.FILL_BOTH));
        Display display = shell.getDisplay();

        // Set up a gradient background for the selected tab
        tabFolder.setSelectionBackground(new Color[] { display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW),
                display.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW),
                display.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW) }, new int[] { 50, 100 });

        // Add a listener to get the close button on each tab
        tabFolder.addCTabFolderListener(new CTabFolderAdapter() {
            public void itemClosed(CTabFolderEvent event) {
            }
        });
    }

    /**
     * Creates the buttons for moving the insert mark and adding a tab
     * 
     * @param composite the parent composite
     */
    private void createButtons(Composite composite) {
        // Move mark left
        Button button = new Button(composite, SWT.PUSH);
        button.setText("<<");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                if (insertMark > -1) {
                    --insertMark;
                    resetInsertMark();
                }
            }
        });

        // Move mark right
        button = new Button(composite, SWT.PUSH);
        button.setText(">>");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                if (insertMark < tabFolder.getItemCount() - 1) {
                    ++insertMark;
                    resetInsertMark();
                }
            }
        });

        // Add a tab
        button = new Button(composite, SWT.PUSH);
        button.setText("Add Tab");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                new CTabItem(tabFolder, SWT.NONE, insertMark + 1).setText("Tab (" + (insertMark + 1) + ")");
            }
        });
    }

    /**
     * Moves the insert mark to the new location
     */
    private void resetInsertMark() {
        tabFolder.setInsertMark(insertMark, true);

        // Workaround for bug #32846
        if (insertMark == -1) {
            tabFolder.redraw();
        }
    }

    /**
     * The application entry point
     * 
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new ShowCTabFolder().run();
    }
}