///*******************************************************************************
// * Copyright (c) 2006, 2008 IBM Corporation 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:
// * IBM Corporation - initial API and implementation
// *******************************************************************************/
//
//package org.eclipse.jface.viewers;
//
//import java.util.HashSet;
//import java.util.Set;
//
//import org.eclipse.swt.SWT;
//import org.eclipse.swt.graphics.Color;
//import org.eclipse.swt.graphics.Rectangle;
//import org.eclipse.swt.widgets.Control;
//import org.eclipse.swt.widgets.Event;
//import org.eclipse.swt.widgets.Listener;
//
///**
// * OwnerDrawLabelProvider is an abstract implementation of a label provider that
// * handles custom draw.
// *
// * <p>
// * <b>This class is intended to be subclassed by implementors.</b>
// * </p>
// *
// * @since 1.0
// *
// */
//public abstract class OwnerDrawLabelProvider extends CellLabelProvider {
//
// static class OwnerDrawListener implements Listener {
// Set enabledColumns = new HashSet();
// int enabledGlobally = 0;
// private ColumnViewer viewer;
//
// OwnerDrawListener(ColumnViewer viewer) {
// this.viewer = viewer;
// }
//
// public void handleEvent(Event event) {
// CellLabelProvider provider = viewer.getViewerColumn(event.index)
// .getLabelProvider();
// ViewerColumn column = viewer.getViewerColumn(event.index);
// if (enabledGlobally > 0 || enabledColumns.contains(column)) {
// if (provider instanceof OwnerDrawLabelProvider) {
// Object element = event.item.getData();
// OwnerDrawLabelProvider ownerDrawProvider = (OwnerDrawLabelProvider) provider;
// switch (event.type) {
// case SWT.MeasureItem:
// ownerDrawProvider.measure(event, element);
// break;
// case SWT.PaintItem:
// ownerDrawProvider.paint(event, element);
// break;
// case SWT.EraseItem:
// ownerDrawProvider.erase(event, element);
// break;
// }
// }
// }
// }
// }
//
// private static final String OWNER_DRAW_LABEL_PROVIDER_LISTENER = "owner_draw_label_provider_listener"; //$NON-NLS-1$
//
// /**
// * Set up the owner draw callbacks for the viewer.
// *
// * @param viewer
// * the viewer the owner draw is set up
// *
// * @deprecated Since 3.4, the default implementation of
// * {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
// * in this class will set up the necessary owner draw callbacks
// * automatically. Calls to this method can be removed.
// */
// public static void setUpOwnerDraw(final ColumnViewer viewer) {
// getOrCreateOwnerDrawListener(viewer).enabledGlobally++;
// }
//
// /**
// * @param viewer
// * @param control
// * @return
// */
// private static OwnerDrawListener getOrCreateOwnerDrawListener(
// final ColumnViewer viewer) {
// Control control = viewer.getControl();
// OwnerDrawListener listener = (OwnerDrawListener) control
// .getData(OWNER_DRAW_LABEL_PROVIDER_LISTENER);
// if (listener == null) {
// listener = new OwnerDrawListener(viewer);
// control.setData(OWNER_DRAW_LABEL_PROVIDER_LISTENER, listener);
// control.addListener(SWT.MeasureItem, listener);
// control.addListener(SWT.EraseItem, listener);
// control.addListener(SWT.PaintItem, listener);
// }
// return listener;
// }
//
// /**
// * Create a new instance of the receiver based on a column viewer.
// *
// */
// public OwnerDrawLabelProvider() {
//
// }
//
// public void dispose(ColumnViewer viewer, ViewerColumn column) {
// if (!viewer.getControl().isDisposed()) {
// setOwnerDrawEnabled(viewer, column, false);
// }
// super.dispose(viewer, column);
// }
//
// /**
// * This implementation of
// * {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
// * delegates to {@link #initialize(ColumnViewer, ViewerColumn, boolean)}
// * with a value of <code>true</code> for <code>enableOwnerDraw</code>.
// * Subclasses may override this method but should either call the super
// * implementation or, alternatively,
// * {@link #initialize(ColumnViewer, ViewerColumn, boolean)}.
// */
// protected void initialize(ColumnViewer viewer, ViewerColumn column) {
// this.initialize(viewer, column, true);
// }
//
// /**
// * May be called from subclasses that override
// * {@link #initialize(ColumnViewer, ViewerColumn)} but want to customize
// * whether owner draw will be enabled. This method calls
// * <code>super.initialize(ColumnViewer, ViewerColumn)</code>, and then
// * enables or disables owner draw by calling
// * {@link #setOwnerDrawEnabled(ColumnViewer, ViewerColumn, boolean)}.
// *
// * @param viewer
// * the viewer
// * @param column
// * the column, or <code>null</code> if a column is not
// * available.
// * @param enableOwnerDraw
// * <code>true</code> if owner draw should be enabled for the
// * given viewer and column, <code>false</code> otherwise.
// *
// * @since 1.1
// */
// final protected void initialize(ColumnViewer viewer, ViewerColumn column,
// boolean enableOwnerDraw) {
// super.initialize(viewer, column);
// setOwnerDrawEnabled(viewer, column, enableOwnerDraw);
// }
//
// public void update(ViewerCell cell) {
// // Force a redraw
// Rectangle cellBounds = cell.getBounds();
// cell.getControl().redraw(cellBounds.x, cellBounds.y, cellBounds.width,
// cellBounds.height, true);
//
// }
//
// /**
// * Handle the erase event. The default implementation colors the background
// * of selected areas with {@link SWT#COLOR_LIST_SELECTION} and foregrounds
// * with {@link SWT#COLOR_LIST_SELECTION_TEXT}. Note that this
// * implementation causes non-native behavior on some platforms. Subclasses
// * should override this method and <b>not</b> call the super
// * implementation.
// *
// * @param event
// * the erase event
// * @param element
// * the model object
// * @see SWT#EraseItem
// * @see SWT#COLOR_LIST_SELECTION
// * @see SWT#COLOR_LIST_SELECTION_TEXT
// */
// protected void erase(Event event, Object element) {
//
// Rectangle bounds = event.getBounds();
// if ((event.detail & SWT.SELECTED) != 0) {
//
// Color oldForeground = event.gc.getForeground();
// Color oldBackground = event.gc.getBackground();
//
// event.gc.setBackground(event.item.getDisplay().getSystemColor(
// SWT.COLOR_LIST_SELECTION));
// event.gc.setForeground(event.item.getDisplay().getSystemColor(
// SWT.COLOR_LIST_SELECTION_TEXT));
// event.gc.fillRectangle(bounds);
// /* restore the old GC colors */
// event.gc.setForeground(oldForeground);
// event.gc.setBackground(oldBackground);
// /* ensure that default selection is not drawn */
// event.detail &= ~SWT.SELECTED;
//
// }
//
// }
//
// /**
// * Handle the measure event.
// *
// * @param event
// * the measure event
// * @param element
// * the model element
// * @see SWT#MeasureItem
// */
// protected abstract void measure(Event event, Object element);
//
// /**
// * Handle the paint event.
// *
// * @param event
// * the paint event
// * @param element
// * the model element
// * @see SWT#PaintItem
// */
// protected abstract void paint(Event event, Object element);
//
// /**
// * Enables or disables owner draw for the given viewer and column. This
// * method will attach or remove a listener to the underlying control as
// * necessary. This method is called from
// * {@link #initialize(ColumnViewer, ViewerColumn)} and
// * {@link #dispose(ColumnViewer, ViewerColumn)} but may be called from
// * subclasses to enable or disable owner draw dynamically.
// *
// * @param viewer
// * the viewer
// * @param column
// * the column, or <code>null</code> if a column is not
// * available
// * @param enabled
// * <code>true</code> if owner draw should be enabled,
// * <code>false</code> otherwise
// *
// * @since 1.1
// */
// protected void setOwnerDrawEnabled(ColumnViewer viewer,
// ViewerColumn column, boolean enabled) {
// if (enabled) {
// OwnerDrawListener listener = getOrCreateOwnerDrawListener(viewer);
// if (column == null) {
// listener.enabledGlobally++;
// } else {
// listener.enabledColumns.add(column);
// }
// } else {
// OwnerDrawListener listener = (OwnerDrawListener) viewer
// .getControl().getData(OWNER_DRAW_LABEL_PROVIDER_LISTENER);
// if (listener != null) {
// if (column == null) {
// listener.enabledGlobally--;
// } else {
// listener.enabledColumns.remove(column);
// }
// if (listener.enabledColumns.isEmpty()
// && listener.enabledGlobally <= 0) {
// viewer.getControl().removeListener(SWT.MeasureItem,
// listener);
// viewer.getControl().removeListener(SWT.EraseItem, listener);
// viewer.getControl().removeListener(SWT.PaintItem, listener);
// viewer.getControl().setData(
// OWNER_DRAW_LABEL_PROVIDER_LISTENER, null);
// }
// }
// }
// }
//
//}