Example usage for org.eclipse.swt.widgets Tree isDisposed

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Tree isDisposed.

Prototype

public boolean isDisposed() 

Source Link

Document

Returns true if the widget has been disposed, and false otherwise.

Usage

From source file:org.eclipse.swt.snippets.Snippet221.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 221");
    shell.setLayout(new FillLayout());
    final Tree tree = new Tree(shell, SWT.FULL_SELECTION | SWT.BORDER);
    tree.setHeaderVisible(true);//  w  ww .  j ava 2  s.  c o  m
    TreeColumn column0 = new TreeColumn(tree, SWT.LEFT);
    column0.setText("Column 0");
    TreeColumn column1 = new TreeColumn(tree, SWT.LEFT);
    column1.setText("Column 1");
    TreeColumn column2 = new TreeColumn(tree, SWT.LEFT);
    column2.setText("Column 2");
    for (int i = 0; i < 9; i++) {
        TreeItem item = new TreeItem(tree, SWT.NONE);
        item.setText("item " + i);
        item.setText(1, "column 1 - " + i);
        item.setText(2, "column 2 - " + i);
        for (int j = 0; j < 9; j++) {
            TreeItem subItem = new TreeItem(item, SWT.NONE);
            subItem.setText("item " + i + " " + j);
            subItem.setText(1, "column 1 - " + i + " " + j);
            subItem.setText(2, "column 2 - " + i + " " + j);
            for (int k = 0; k < 9; k++) {
                TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
                subsubItem.setText("item " + i + " " + j + " " + k);
                subsubItem.setText(1, "column 1 - " + i + " " + j + " " + k);
                subsubItem.setText(2, "column 2 - " + i + " " + j + " " + k);
            }
        }
    }
    column0.pack();
    column1.pack();
    column2.pack();

    Heartbeat = () -> {
        if (!Tracking || tree.isDisposed())
            return;
        Point cursor = display.getCursorLocation();
        cursor = display.map(null, tree, cursor);
        Scroll(tree, cursor.x, cursor.y);
        display.timerExec(ScrollSpeed, Heartbeat);
    };
    Listener listener = event -> {
        switch (event.type) {
        case SWT.MouseEnter:
            Tracking = true;
            display.timerExec(0, Heartbeat);
            break;
        case SWT.MouseExit:
            Tracking = false;
            break;
        }
    };
    tree.addListener(SWT.MouseEnter, listener);
    tree.addListener(SWT.MouseExit, listener);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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