Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2007 Boeing. * 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: * Boeing - initial API and implementation *******************************************************************************/ package com.hydra.project.myplugin_nebula.xviewer; import java.util.Arrays; import java.util.HashMap; import java.util.Map; import java.util.logging.Level; import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider; import org.eclipse.jface.viewers.StyledCellLabelProvider; import org.eclipse.jface.viewers.StyledString; import org.eclipse.jface.viewers.ViewerCell; import com.hydra.project.myplugin_nebula.xviewer.util.internal.XViewerLog; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; /** * @author Donald G. Dunne */ public abstract class XViewerStyledTextLabelProvider extends StyledCellLabelProvider implements IXViewerLabelProvider { private final XViewer viewer; // Store index of columnIndex to XViewerColumns to speed up label providing private final Map<Integer, XViewerColumn> indexToXViewerColumnMap = new HashMap<Integer, XViewerColumn>(); @Override public XViewerColumn getTreeColumnOffIndex(int columnIndex) { if (!indexToXViewerColumnMap.containsKey(columnIndex)) { XViewerColumn xViewerColumn = viewer.getXTreeColumn(columnIndex); if (xViewerColumn != null) { indexToXViewerColumnMap.put(columnIndex, xViewerColumn); } } return indexToXViewerColumnMap.get(columnIndex); } // When columns get re-ordered, need to clear out this cache so indexing can // be re-computed @Override public void clearXViewerColumnIndexCache() { indexToXViewerColumnMap.clear(); } @Override public Object getBackingData(Object element, XViewerColumn xViewerColumn, int columnIndex) throws Exception { try { // If not shown, don't process any further if (!xViewerColumn.isShow()) { return ""; } // First check value column's methods if (xViewerColumn instanceof IXViewerValueColumn) { Object obj = ((IXViewerValueColumn) xViewerColumn).getBackingData(element, xViewerColumn, columnIndex); if (obj != null) { return obj; } } } catch (Exception ex) { return XViewerCells.getCellExceptionString(ex); } return null; } /** * Creates a {@link XViewerStyledTextLabelProvider} that delegates the requests for the styled labels and the images * to a {@link IStyledLabelProvider}. * * @param labelProvider the label provider that provides the styled labels and the images */ public XViewerStyledTextLabelProvider(XViewer viewer) { this.viewer = viewer; } @Override public void update(ViewerCell cell) { Object element = cell.getElement(); StyledString styledString = getStyledText(element, cell.getColumnIndex()); String newText = styledString.toString(); StyleRange[] oldStyleRanges = cell.getStyleRanges(); StyleRange[] newStyleRanges = isOwnerDrawEnabled() ? styledString.getStyleRanges() : null; if (!Arrays.equals(oldStyleRanges, newStyleRanges)) { cell.setStyleRanges(newStyleRanges); // if (cell.getText().equals(newText)) { // // make sure there will be a refresh from a change // cell.setText(""); //$NON-NLS-1$ // } } cell.setText(newText); cell.setImage(getColumnImage(element, cell.getColumnIndex())); cell.setFont(getFont(element, cell.getColumnIndex())); cell.setForeground(getForeground(element, cell.getColumnIndex())); cell.setBackground(getBackground(element, cell.getColumnIndex())); // no super call required. changes on item will trigger the refresh. } @Override public int getColumnGradient(Object element, XViewerColumn xCol, int columnIndex) throws Exception { return 0; } private Font getFont(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof XViewerValueColumn) { return ((XViewerValueColumn) xViewerColumn).getFont(element, xViewerColumn, columnIndex); } else { return getFont(element, xViewerColumn, columnIndex); } } catch (Exception ex) { // do nothing } return null; } public Image getColumnImage(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof XViewerValueColumn) { Image image = ((XViewerValueColumn) xViewerColumn).getColumnImage(element, xViewerColumn, columnIndex); if (image != null) { return image; } } return getColumnImage(element, xViewerColumn, columnIndex); } catch (Exception ex) { XViewerLog.log(Activator.class, Level.SEVERE, ex); } return null; } StyledString getStyledText(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return new StyledString(""); } if (xViewerColumn instanceof XViewerValueColumn) { return ((XViewerValueColumn) xViewerColumn).getStyledText(element, xViewerColumn, columnIndex); } return getStyledText(element, xViewerColumn, columnIndex); } catch (Exception ex) { return new StyledString(XViewerCells.getCellExceptionString(ex)); } } private Color getBackground(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); if (viewer.isSearch()) { StyledString text = getStyledText(element, columnIndex); if (viewer.searchMatch(text.getString())) { return viewer.getSearchMatchColor(); } } // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof XViewerValueColumn) { return ((XViewerValueColumn) xViewerColumn).getBackground(element, xViewerColumn, columnIndex); } else { return getBackground(element, xViewerColumn, columnIndex); } } catch (Exception ex) { // do nothing } return null; } private Color getForeground(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return null; } if (xViewerColumn instanceof XViewerValueColumn) { return ((XViewerValueColumn) xViewerColumn).getForeground(element, xViewerColumn, columnIndex); } else { return getForeground(element, xViewerColumn, columnIndex); } } catch (Exception ex) { // do nothing } return null; } @Override public String getColumnText(Object element, XViewerColumn xCol, int column) throws Exception { return getStyledText(element, xCol, column).getString(); } @Override public String getColumnText(Object element, int columnIndex) { try { XViewerColumn xViewerColumn = getTreeColumnOffIndex(columnIndex); // If not shown, don't process any further if (!xViewerColumn.isShow()) { return ""; } // First check value column's methods if (xViewerColumn instanceof IXViewerValueColumn) { String str = ((IXViewerValueColumn) xViewerColumn).getColumnText(element, xViewerColumn, columnIndex); if (str != null) { return str; } return ""; } // Return label provider's value return getColumnText(element, xViewerColumn, columnIndex); } catch (Exception ex) { return XViewerCells.getCellExceptionString(ex); } } public abstract Image getColumnImage(Object element, XViewerColumn xCol, int column) throws Exception; public abstract StyledString getStyledText(Object element, XViewerColumn xCol, int column) throws Exception; public abstract Color getBackground(Object element, XViewerColumn viewerColumn, int columnIndex) throws Exception; public abstract Color getForeground(Object element, XViewerColumn viewerColumn, int columnIndex) throws Exception; public abstract Font getFont(Object element, XViewerColumn viewerColumn, int columnIndex) throws Exception; }