/*******************************************************************************
* Copyright (c) 2014 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.swt.listener;
import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.tcf.te.ui.swt.SWTControlUtil;
/**
* Abstract check box cell paint listener implementation.
*/
public abstract class AbstractCheckBoxCellPaintListener extends AbstractCellPaintListener {
private static final int ENABLED = 1;
private static final int CHECKED = 2;
private static final int TRISTATE = 4;
protected static final int STATE_NONE = -1;
protected static final int STATE_ENABLED_CHECKED = ENABLED | CHECKED;
protected static final int STATE_ENABLED_UNCHECKED = ENABLED;
protected static final int STATE_ENABLED_TRISTATE = ENABLED | TRISTATE;
protected static final int STATE_DISABLED_CHECKED = CHECKED;
protected static final int STATE_DISABLED_UNCHECKED = 0;
protected static final int STATE_DISABLED_TRISTATE = TRISTATE;
/**
* Constructor.
*
* @param columns The valid columns.
* @param widget The widget.
*/
public AbstractCheckBoxCellPaintListener(Widget widget, int... columns) {
super(widget, columns);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.ui.swt.listener.AbstractCellPaintListener#getPaintOrigin(org.eclipse.swt.widgets.Event, org.eclipse.swt.graphics.Image)
*/
@Override
protected Point getPaintOrigin(Event event, Image image) {
// Determine host platform
boolean isWindowsHost = System.getProperty("os.name","").toLowerCase().startsWith("windows"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
// Center the image horizontally within the column
int x = event.x + (getWidgetWidth(event)/2 - image.getImageData().width / 2);
// Center the image vertically within the column
int y = isWindowsHost ? event.y : event.y + event.height - (image.getImageData().height + 4);
return new Point(x, y);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.ui.swt.listener.AbstractCellPaintListener#getImageToDraw(org.eclipse.swt.widgets.Item, int)
*/
@Override
protected Image getImageToDraw(Item item, int columnIndex) {
Assert.isNotNull(item);
// If the image shall be painted to the current column
if (isPaintImageInColumn(columnIndex)) {
// Check which image to paint
int state = getCheckBoxState(item.getData(), columnIndex);
if (state >= 0) {
return SWTControlUtil.getCheckBoxImage((state & CHECKED) != 0, (state & TRISTATE) != 0, (state & ENABLED) != 0);
}
}
return null;
}
/**
* Returns the state for the check box.
*
* @param data The associated event data or <code>null</code>:
* @param columnIndex The column index of the current column.
*
* @return The state for the check box.
*/
protected abstract int getCheckBoxState(Object data, int columnIndex);
}