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/*******************************************************************************
* Copyright (c) 2011, 2012 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.ui.trees;
import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Tree;
/**
* The header context menu for the execution context viewer. This context menu
* provides the list of columns that users can configure them by simply checking
* or unchecking them.
*/
public class TreeViewerHeaderMenu extends Menu implements SelectionListener, Listener, DisposeListener {
//The menu control used to configure the columns.
private Menu treeMenu;
//The tree to be configured.
private AbstractTreeControl treeControl;
/**
* Create a header menu for the execution context viewer.
*
* @param tree The execution context tree.
*/
public TreeViewerHeaderMenu(AbstractTreeControl treeControl) {
super(treeControl.getViewer().getControl());
this.treeControl = treeControl;
Tree tree = (Tree) treeControl.getViewer().getControl();
tree.addListener(SWT.MenuDetect, this);
tree.addDisposeListener(this);
treeMenu = tree.getMenu();
}
/**
* Create the menu.
*/
public void create() {
ColumnDescriptor[] columns = treeControl.getViewerColumns();
Assert.isNotNull(columns);
for (int i = 0; i < columns.length; i++) {
ColumnDescriptor column = columns[i];
MenuItem menuItem = new MenuItem(this, SWT.CHECK);
menuItem.setText(column.getName());
menuItem.setSelection(column.isVisible());
menuItem.addSelectionListener(this);
menuItem.setData(column);
menuItem.setEnabled(i != 0);
}
}
/*
* (non-Javadoc)
* @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
*/
@Override
public void widgetSelected(SelectionEvent e) {
MenuItem item = (MenuItem) e.getSource();
ColumnDescriptor column = (ColumnDescriptor) item.getData();
boolean visible = item.getSelection();
if (treeControl.setColumnVisible(column, visible)){
treeControl.columnMoved();
treeControl.getViewer().refresh();
}
}
/*
* (non-Javadoc)
* @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(org.eclipse.swt.events.SelectionEvent)
*/
@Override
public void widgetDefaultSelected(SelectionEvent e) {
}
/*
* (non-Javadoc)
* @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
*/
@Override
public void handleEvent(Event event) {
Tree t = (Tree) event.widget;
Point pt = t.getDisplay().map(null, t, event.x, event.y);
Rectangle clientArea = t.getClientArea();
boolean isHeader = ((pt.y - clientArea.y) <= t.getHeaderHeight());
t.setMenu(isHeader ? this : treeMenu);
}
/*
* (non-Javadoc)
* @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
*/
@Override
public void widgetDisposed(DisposeEvent e) {
if (treeMenu != null && !treeMenu.isDisposed())
treeMenu.dispose();
if (!isDisposed())
dispose();
}
/**
* Override the super method to allow the subclassing.
*/
@Override
protected void checkSubclass() {
}
/**
* Update the menu item's check state according to the new column's visibility.
*/
public void updateSelection() {
ColumnDescriptor[] columns = treeControl.getViewerColumns();
Assert.isNotNull(columns);
for (int i = 0; i < columns.length; i++) {
MenuItem item = this.getItem(i);
ColumnDescriptor column = columns[i];
item.setSelection(column.isVisible());
}
}
}
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