Examples with KeyEventDispatcher java.awt.KeyEventDispatcher used on opensource projects

Example 6 with KeyEventDispatcher

use of java.awt.KeyEventDispatcher in project tetrad by cmu-phil.

the class AbstractWorkbench method registerKeys.

/**
 * Registers the remove and backspace keys to remove selected objects.
 */
private void registerKeys() {
    getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_BACK_SPACE, 0), "DELETE");
    getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0), "DELETE");
    Action deleteAction = new AbstractAction() {

        public void actionPerformed(ActionEvent e) {
            AbstractWorkbench workbench = (AbstractWorkbench) e.getSource();
            List<Component> components = workbench.getSelectedComponents();
            int numNodes = 0, numEdges = 0;
            for (Component c : components) {
                if (c instanceof DisplayNode) {
                    numNodes++;
                } else if (c instanceof DisplayEdge) {
                    numEdges++;
                }
            }
            StringBuilder buf = new StringBuilder();
            if (isDeleteVariablesAllowed()) {
                buf.append("Number of nodes selected = ");
                buf.append(numNodes);
            }
            buf.append("\nNumber of edges selected = ");
            buf.append(numEdges);
            buf.append("\n\nDelete selected items?");
            int ret = JOptionPane.showConfirmDialog(workbench, buf.toString());
            if (ret != JOptionPane.YES_OPTION) {
                return;
            }
            deleteSelectedObjects();
        }
    };
    getActionMap().put("DELETE", deleteAction);
    if (controlDispatcher == null) {
        controlDispatcher = new KeyEventDispatcher() {

            public boolean dispatchKeyEvent(KeyEvent e) {
                return respondToControlKey(e);
            }
        };
    }
    KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(controlDispatcher);
}