buttonactivationlistener.java

来自「Python Development Environment (Python I」· Java 代码 · 共 47 行

package org.python.pydev.refactoring.ui.pages.listener;

import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Table;

public class ButtonActivationListener implements Listener {

	private Table table;

	private Button upButton;

	private Button downButton;

	private Button editButton;

	public ButtonActivationListener(Table table, Button upButton, Button downButton, Button editButton) {
		this.table = table;
		this.upButton = upButton;
		this.downButton = downButton;
		this.editButton = editButton;
	}

	public void handleEvent(Event event) {
		updateButtonState();
	}

	private void updateButtonState() {
		editButton.setEnabled(false);
		upButton.setEnabled(true);
		downButton.setEnabled(true);
		if (table.getSelectionCount() == 1) {
			editButton.setEnabled(true);
			if (table.getSelectionIndex() == table.getItemCount() - 1) {
				downButton.setEnabled(false);
			}

			if (table.getSelectionIndex() == 0) {
				upButton.setEnabled(false);
			}
		}

	}

}