Java tutorial
/******************************************************************************* * Copyright (c) 2007 Tom Schindl 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: * Tom Schindl - initial API and implementation *******************************************************************************/ import org.eclipse.jface.viewers.ColumnViewer; import org.eclipse.jface.viewers.ColumnViewerToolTipSupport; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.window.DefaultToolTip; import org.eclipse.jface.window.ToolTip; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Item; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; /** * Example usage of ToolTips with the OLD viewer API but similar to * {@link ColumnViewerToolTipSupport} * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet042ToolTipSupportFor32API { private static Image[] images; private static class Cell { private Item item; private int index; public Cell(Item item, int index) { this.item = item; this.index = index; } public Object getData() { return item.getData(); } public int hashCode() { final int prime = 31; int result = 1; result = prime * result + index; result = prime * result + ((item == null) ? 0 : item.hashCode()); return result; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final Cell other = (Cell) obj; if (index != other.index) return false; if (item == null) { if (other.item != null) return false; } else if (!item.equals(other.item)) return false; return true; } } private static class ToolTipSupport extends DefaultToolTip { private Cell cell; private ColumnViewer viewer; protected ToolTipSupport(ColumnViewer viewer, int style, boolean manualActivation) { super(viewer.getControl(), style, manualActivation); this.viewer = viewer; } protected Object getToolTipArea(Event event) { Table table = (Table) event.widget; int columns = table.getColumnCount(); Point point = new Point(event.x, event.y); TableItem item = table.getItem(point); if (item != null) { for (int i = 0; i < columns; i++) { if (item.getBounds(i).contains(point)) { this.cell = new Cell(item, i); return cell; } } } return null; } protected Composite createToolTipContentArea(Event event, Composite parent) { Composite comp = new Composite(parent, SWT.NONE); comp.setLayout(new FillLayout()); Button b = new Button(comp, SWT.PUSH); b.setText(((ITableLabelProvider) viewer.getLabelProvider()).getColumnText(cell.getData(), cell.index)); b.setImage( ((ITableLabelProvider) viewer.getLabelProvider()).getColumnImage(cell.getData(), cell.index)); return comp; } public static void enableFor(ColumnViewer viewer) { new ToolTipSupport(viewer, ToolTip.NO_RECREATE, false); } } private class MyContentProvider implements IStructuredContentProvider { /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) */ public Object[] getElements(Object inputElement) { return (MyModel[]) inputElement; } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IContentProvider#dispose() */ public void dispose() { } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, * java.lang.Object, java.lang.Object) */ public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } } public class MyModel { public int counter; public MyModel(int counter) { this.counter = counter; } public String toString() { return "Item " + this.counter; } } public class MyLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int columnIndex) { if (columnIndex == 1) { return images[((MyModel) element).counter % 4]; } return null; } public String getColumnText(Object element, int columnIndex) { return "Column " + columnIndex + " => " + element.toString(); } } private static Image createImage(Display display, int red, int green, int blue) { Color color = new Color(display, red, green, blue); Image image = new Image(display, 10, 10); GC gc = new GC(image); gc.setBackground(color); gc.fillRectangle(0, 0, 10, 10); gc.dispose(); return image; } public Snippet042ToolTipSupportFor32API(Shell shell) { final TableViewer v = new TableViewer(shell, SWT.BORDER | SWT.FULL_SELECTION); v.setLabelProvider(new MyLabelProvider()); v.setContentProvider(new MyContentProvider()); TableColumn column = new TableColumn(v.getTable(), SWT.NONE); column.setWidth(200); column.setText("Column 1"); column = new TableColumn(v.getTable(), SWT.NONE); column.setWidth(200); column.setText("Column 2"); MyModel[] model = createModel(); v.setInput(model); ToolTipSupport.enableFor(v); v.getTable().setLinesVisible(true); v.getTable().setHeaderVisible(true); } private MyModel[] createModel() { MyModel[] elements = new MyModel[10]; for (int i = 0; i < 10; i++) { elements[i] = new MyModel(i); } return elements; } /** * @param args */ public static void main(String[] args) { Display display = new Display(); images = new Image[4]; images[0] = createImage(display, 0, 0, 255); images[1] = createImage(display, 0, 255, 255); images[2] = createImage(display, 0, 255, 0); images[3] = createImage(display, 255, 0, 255); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet042ToolTipSupportFor32API(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } for (int i = 0; i < images.length; i++) { images[i].dispose(); } display.dispose(); } }