org.csstudio.alarm.beast.ui.areapanel.AlarmPanelItem.java Source code

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Here is the source code for org.csstudio.alarm.beast.ui.areapanel.AlarmPanelItem.java

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/*******************************************************************************
 * Copyright (c) 2011 Oak Ridge National Laboratory.
 *  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
 ******************************************************************************/
package org.csstudio.alarm.beast.ui.areapanel;

import java.util.ArrayList;
import java.util.List;

import org.csstudio.alarm.beast.SeverityLevel;
import org.csstudio.alarm.beast.client.AlarmTreeItem;
import org.csstudio.alarm.beast.ui.ContextMenuHelper;
import org.csstudio.alarm.beast.ui.SeverityColorProvider;
import org.csstudio.alarm.beast.ui.actions.AlarmPerspectiveAction;
import org.csstudio.utility.singlesource.SingleSourcePlugin;
import org.csstudio.utility.singlesource.UIHelper.UI;
import org.eclipse.jface.action.GroupMarker;
import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.IWorkbenchActionConstants;

/** GUI element for one {@link AlarmTreeItem} on the alarm panel
 *  @author Kay Kasemir
 */
public class AlarmPanelItem extends Canvas implements PaintListener {
    final private SeverityColorProvider color_provider;
    final private AlarmTreeItem item;
    private SeverityLevel last_alarm_state;

    /** Initialize
     *  @param parent
     *  @param color_provider
     *  @param item
     */
    public AlarmPanelItem(final Composite parent, final SeverityColorProvider color_provider,
            final AlarmTreeItem item) {
        super(parent, SWT.DOUBLE_BUFFERED);
        this.color_provider = color_provider;
        this.item = item;
        addPaintListener(this);
        addContextMenu();
    }

    private void addContextMenu() {
        final boolean isRcp = UI.RCP.equals(SingleSourcePlugin.getUIHelper().getUI());
        final List<AlarmTreeItem> item_as_list = new ArrayList<AlarmTreeItem>(1);
        item_as_list.add(item);

        final MenuManager manager = new MenuManager();
        manager.setRemoveAllWhenShown(true);
        manager.addMenuListener(new IMenuListener() {
            @Override
            public void menuAboutToShow(IMenuManager manager) {
                manager.add(new ShowInAlarmTreeAction(item));
                new ContextMenuHelper(null, manager, getShell(), item_as_list, true);
                manager.add(new Separator());
                if (isRcp) {
                    manager.add(new AlarmPerspectiveAction());
                    manager.add(new Separator());
                }
                manager.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));
            }
        });
        final Menu menu = manager.createContextMenu(this);
        setMenu(menu);
    }

    /** Draw the item
     *  {@inheritDoc}
     */
    @Override
    public void paintControl(final PaintEvent e) {
        final Display display = getDisplay();
        final GC gc = e.gc;
        final Rectangle bounds = getBounds();

        last_alarm_state = item.getSeverity();
        gc.setBackground(color_provider.getColor(last_alarm_state));
        gc.fillRoundRectangle(0, 0, bounds.width, bounds.height, 10, 10);

        gc.setForeground(display.getSystemColor(SWT.COLOR_WIDGET_BORDER));
        gc.drawRoundRectangle(0, 0, bounds.width - 1, bounds.height - 1, 10, 10);

        // Draw Text
        gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
        final String label = item.getName();
        final Point extend = gc.textExtent(label);
        gc.drawString(label, (bounds.width - extend.x) / 2, (bounds.height - extend.y) / 2, true);
    }

    /** If the alarm tree item has changed since the last redraw,
     *  refresh the display.
     */
    public void updateAlarmState() {
        if (item.getSeverity().equals(last_alarm_state))
            return;
        redraw();
    }
}