Java tutorial
/******************************************************************************* * Copyright (c) 2007 Adam Neal 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: * Adam Neal - initial API and implementation *******************************************************************************/ package cz.kpartl; import java.util.ArrayList; import java.util.List; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ILabelProviderListener; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; /** * A simple TableViewer to demonstrate how custom tooltips could be created easily while preserving * the multiple selection. * * This is a modified example taken from Tom Schindl's Snippet023TreeViewerCustomTooltips.java * * This code is for users pre 3.3 others could use newly added tooltip support in {@link CellLabelProvider} * @author Adam Neal <Adam_Neal@ca.ibm.com> * */ public class Snippet031TableViewerCustomTooltipsMultiSelection { public class MyLableProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { if (element instanceof MyModel) { switch (columnIndex) { case 0: return ((MyModel) element).col1; case 1: return ((MyModel) element).col2; } } return ""; } public void addListener(ILabelProviderListener listener) { /* Ignore */ } public void dispose() { /* Ignore */ } public boolean isLabelProperty(Object element, String property) { return false; } public void removeListener(ILabelProviderListener listener) { /* Ignore */ } } public class MyModel { public String col1, col2; public MyModel(String c1, String c2) { col1 = c1; col2 = c2; } public String toString() { return col1 + col2; } } public Snippet031TableViewerCustomTooltipsMultiSelection(Shell shell) { final Table table = new Table(shell, SWT.H_SCROLL | SWT.V_SCROLL | SWT.MULTI | SWT.FULL_SELECTION); table.setHeaderVisible(true); table.setLinesVisible(true); final TableViewer v = new TableViewer(table); TableColumn tableColumn1 = new TableColumn(table, SWT.NONE); TableColumn tableColumn2 = new TableColumn(table, SWT.NONE); String column1 = "Column 1", column2 = "Column 2"; /* Setup the table columns */ tableColumn1.setText(column1); tableColumn2.setText(column2); tableColumn1.pack(); tableColumn2.pack(); v.setColumnProperties(new String[] { column1, column2 }); v.setLabelProvider(new MyLableProvider()); v.setContentProvider(new ArrayContentProvider()); v.setInput(createModel()); /** * The listener that gets added to the table. This listener is responsible for creating the tooltips * when hovering over a cell item. This listener will listen for the following events: * <li>SWT.KeyDown - to remove the tooltip</li> * <li>SWT.Dispose - to remove the tooltip</li> * <li>SWT.MouseMove - to remove the tooltip</li> * <li>SWT.MouseHover - to set the tooltip</li> */ Listener tableListener = new Listener() { Shell tooltip = null; Label label = null; /* * (non-Javadoc) * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event) */ public void handleEvent(Event event) { switch (event.type) { case SWT.KeyDown: case SWT.Dispose: case SWT.MouseMove: { if (tooltip == null) break; tooltip.dispose(); tooltip = null; label = null; break; } case SWT.MouseHover: { Point coords = new Point(event.x, event.y); TableItem item = table.getItem(coords); if (item != null) { int columnCount = table.getColumnCount(); for (int columnIndex = 0; columnIndex < columnCount; columnIndex++) { if (item.getBounds(columnIndex).contains(coords)) { /* Dispose of the old tooltip (if one exists */ if (tooltip != null && !tooltip.isDisposed()) tooltip.dispose(); /* Create a new Tooltip */ tooltip = new Shell(table.getShell(), SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL); tooltip.setBackground(table.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND)); FillLayout layout = new FillLayout(); layout.marginWidth = 2; tooltip.setLayout(layout); label = new Label(tooltip, SWT.NONE); label.setForeground(table.getDisplay().getSystemColor(SWT.COLOR_INFO_FOREGROUND)); label.setBackground(table.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND)); /* Store the TableItem with the label so we can pass the mouse event later */ label.setData("_TableItem_", item); /* Set the tooltip text */ label.setText("Tooltip: " + item.getData() + " : " + columnIndex); /* Setup Listeners to remove the tooltip and transfer the received mouse events */ label.addListener(SWT.MouseExit, tooltipLabelListener); label.addListener(SWT.MouseDown, tooltipLabelListener); /* Set the size and position of the tooltip */ Point size = tooltip.computeSize(SWT.DEFAULT, SWT.DEFAULT); Rectangle rect = item.getBounds(columnIndex); Point pt = table.toDisplay(rect.x, rect.y); tooltip.setBounds(pt.x, pt.y, size.x, size.y); /* Show it */ tooltip.setVisible(true); break; } } } } } } }; table.addListener(SWT.Dispose, tableListener); table.addListener(SWT.KeyDown, tableListener); table.addListener(SWT.MouseMove, tableListener); table.addListener(SWT.MouseHover, tableListener); } /** * This listener is added to the tooltip so that it can either dispose itself if the mouse * exits the tooltip or so it can pass the selection event through to the table. */ final TooltipLabelListener tooltipLabelListener = new TooltipLabelListener(); final class TooltipLabelListener implements Listener { private boolean isCTRLDown(Event e) { return (e.stateMask & SWT.CTRL) != 0; } /* * (non-Javadoc) * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event) */ public void handleEvent(Event event) { Label label = (Label) event.widget; Shell shell = label.getShell(); switch (event.type) { case SWT.MouseDown: /* Handle a user Click */ /* Extract our Data */ Event e = new Event(); e.item = (TableItem) label.getData("_TableItem_"); Table table = ((TableItem) e.item).getParent(); /* Construct the new Selection[] to show */ TableItem[] newSelection = null; if (isCTRLDown(event)) { /* We have 2 scenario's. * 1) We are selecting an already selected element - so remove it from the selected indices * 2) We are selecting a non-selected element - so add it to the selected indices */ TableItem[] sel = table.getSelection(); for (int i = 0; i < sel.length; ++i) { if (e.item.equals(sel[i])) { // We are de-selecting this element newSelection = new TableItem[sel.length - 1]; System.arraycopy(sel, 0, newSelection, 0, i); System.arraycopy(sel, i + 1, newSelection, i, sel.length - i - 1); break; } } /* * If we haven't created the newSelection[] yet, than we are adding the newly selected element * into the list of selected indicies */ if (newSelection == null) { newSelection = new TableItem[sel.length + 1]; System.arraycopy(sel, 0, newSelection, 0, sel.length); newSelection[sel.length] = (TableItem) e.item; } } else { /* CTRL is not down, so we simply select the single element */ newSelection = new TableItem[] { (TableItem) e.item }; } /* Set the new selection of the table and notify the listeners */ table.setSelection(newSelection); table.notifyListeners(SWT.Selection, e); /* Remove the Tooltip */ shell.dispose(); table.setFocus(); break; case SWT.MouseExit: shell.dispose(); break; } } }; private List createModel() { ArrayList list = new ArrayList(); list.add(new MyModel("A", "B")); list.add(new MyModel("C", "D")); list.add(new MyModel("E", "F")); return list; } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet031TableViewerCustomTooltipsMultiSelection(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }