Java tutorial
package org.eclipse.nebula.snippets.grid.viewer; /******************************************************************************* * Copyright (c) 2006 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 * Mirko Paturzo - adding dispose functions example and * defaults properties change *******************************************************************************/ import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.TransformerException; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.resource.FontRegistry; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.ColumnViewerEditor; import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent; import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy; import org.eclipse.jface.viewers.ICellModifier; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITableColorProvider; import org.eclipse.jface.viewers.ITableFontProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.TextCellEditor; import org.eclipse.jface.viewers.Viewer; import org.eclipse.nebula.jface.gridviewer.GridTableViewer; import org.eclipse.nebula.jface.gridviewer.GridViewerEditor; import org.eclipse.nebula.widgets.grid.Grid; import org.eclipse.nebula.widgets.grid.GridColumn; import org.eclipse.nebula.widgets.grid.GridItem; import org.eclipse.nebula.widgets.grid.GridUtils; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.RowLayout; 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.FileDialog; import org.eclipse.swt.widgets.Shell; /** * Example usage of none mandatory interfaces of ITableFontProvider and * ITableColorProvider * * @author Tom Schindl <tom.schindl@bestsolution.at> * @author Mirko Paturzo <mirko.paturzo@exeura.eu> * * Original example, with something else (NUM_COLUMNS, NUM_MODELS) Using * {@link ColumnRowBigDataVisualizer} * * Suggestions: Take heap dump by jvisualvm and analyze it with * MemoryAnalyzer * */ public class GridViewerSnippetDisposePerformance { private static final int NUM_COLUMNS = 10; private static final int NUM_MODELS = 10; 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 static boolean flag = true; public class MyModel { public int counter; public MyModel(int counter) { this.counter = counter; } @Override public String toString() { return "Item " + this.counter; } } final FontRegistry registry = new FontRegistry(); public class MyLabelProvider extends LabelProvider implements ITableLabelProvider, ITableFontProvider, ITableColorProvider { public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { return "Column " + columnIndex + " => " + element.toString(); } public Font getFont(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 0) { return registry.getBold(Display.getCurrent().getSystemFont().getFontData()[0].getName()); } return null; } public Color getBackground(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 0) { return Display.getCurrent().getSystemColor(SWT.COLOR_RED); } return null; } public Color getForeground(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 1) { return Display.getCurrent().getSystemColor(SWT.COLOR_RED); } return null; } } // field for disable/enable default key listener button private boolean enable = true; public GridViewerSnippetDisposePerformance(final Shell shell, boolean createButtons) { final GridTableViewer v = new GridTableViewer(new Grid(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL) { @Override protected void onKeyDown(Event e) { super.onKeyDown(e); System.out.println(e.keyCode + " Called"); } }); v.setLabelProvider(new MyLabelProvider()); v.setContentProvider(new MyContentProvider()); v.getGrid().setCellSelectionEnabled(true); v.setCellEditors(new CellEditor[] { new TextCellEditor(v.getGrid()), new TextCellEditor(v.getGrid()) }); v.setCellModifier(new ICellModifier() { public boolean canModify(Object element, String property) { return true; } public Object getValue(Object element, String property) { if (element == null) return "Element is null"; return "Column " + property + " => " + element.toString(); } public void modify(Object element, String property, Object value) { } }); v.setColumnProperties(new String[] { "1", "2" }); ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(v) { @Override protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) { return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL || event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION || (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.CR); } }; GridViewerEditor.create(v, actSupport, ColumnViewerEditor.TABBING_HORIZONTAL | ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR | ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION); for (int i = 0; i < NUM_COLUMNS; i++) { createColumn(v, "Column " + i); } if (createButtons) { Composite buttons = new Composite(shell, SWT.NONE); buttons.setLayout(new RowLayout()); final Button remove3 = new Button(buttons, SWT.NONE); remove3.setText("remove row with index 3"); final String restore = "restore grid"; remove3.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { // button.dispose(); try { v.getGrid().remove(3); } catch (java.lang.IllegalArgumentException ie) { new MessageDialog(shell, "IndexOutOfBound error", null, "Restore the grid with button \"" + restore + "\"", MessageDialog.WARNING, new String[] { "Ok" }, 0).open(); } shell.layout(); } }); final Button add3 = new Button(buttons, SWT.NONE); add3.setText("add row with index 3"); add3.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { GridItem gridItem = new GridItem(v.getGrid(), SWT.NONE, 3); gridItem.setText(0, "Added in 3"); shell.layout(); } }); final Button addColumn1 = new Button(buttons, SWT.NONE); addColumn1.setText("add column in 1"); addColumn1.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { new GridColumn(v.getGrid(), SWT.NONE, 1); shell.layout(); } }); final Button removeColumn = new Button(buttons, SWT.NONE); removeColumn.setText("remove first column"); removeColumn.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { // button.dispose(); try { v.getGrid().getColumn(0).dispose(); v.getGrid().redraw(); v.getGrid().layout(); } catch (java.lang.IllegalArgumentException ie) { new MessageDialog(shell, "IndexOutOfBound error", null, "Restore the grid with button \"" + restore + "\"", MessageDialog.WARNING, new String[] { "Ok" }, 0).open(); } shell.layout(); } }); final Button hideColumn = new Button(buttons, SWT.NONE); hideColumn.setText("hide first column"); hideColumn.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { try { GridColumn[] columns = v.getGrid().getColumns(); for (GridColumn gridColumn : columns) { if (gridColumn.isVisible()) { gridColumn.setVisible(false); break; } } } catch (java.lang.IllegalArgumentException ie) { new MessageDialog(shell, "IndexOutOfBound error", null, "Restore the grid with button \"" + restore + "\"", MessageDialog.WARNING, new String[] { "Ok" }, 0).open(); } shell.layout(); } }); final Button manualDeselect = new Button(buttons, SWT.NONE); manualDeselect.setText("Manual Deselect"); manualDeselect.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { Grid grid = v.getGrid(); Point focus = grid.getFocusCell(); int[] selected = grid.getSelectionIndices(); grid.deselect(selected); grid.remove(selected); while (focus.y >= grid.getItemCount()) --focus.y; if (focus.y >= 0) { grid.setFocusItem(grid.getItem(focus.y)); grid.setFocusColumn(grid.getColumn(focus.x)); grid.setCellSelection(focus); } } }); final Button addColumn = new Button(buttons, SWT.NONE); addColumn.setText("add column"); addColumn.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { // button.dispose(); try { createColumn(v, "Added"); } catch (java.lang.IllegalArgumentException ie) { new MessageDialog(shell, "IndexOutOfBound error", null, "Restore the grid with button \"" + restore + "\"", MessageDialog.WARNING, new String[] { "Ok" }, 0).open(); } shell.layout(); } }); final Button changeFont = new Button(buttons, SWT.NONE); changeFont.setText("Change Default"); changeFont.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { v.getGrid().setForeground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE)); v.getGrid().setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_BLACK)); v.getGrid().setFont( registry.getItalic(Display.getCurrent().getSystemFont().getFontData()[0].getName())); shell.layout(); } }); Button exportGrid = new Button(buttons, SWT.NONE); exportGrid.setText("Export Grid"); exportGrid.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { try { if (v.getGrid().isDisposed()) return; FileDialog fileDialog = new FileDialog(shell); fileDialog.setFilterExtensions(new String[] { "*.xml" }); String open = fileDialog.open(); if (open != null) { open = open.endsWith(".xml") ? open : open + ".xml"; FileOutputStream outputStream = new FileOutputStream(new File(open)); try { GridUtils.gridToXml(v.getGrid(), outputStream); new MessageDialog(shell, "Success", null, "Exported in " + open, MessageDialog.INFORMATION, new String[] { "Great!" }, 1).open(); } catch (ParserConfigurationException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (TransformerException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } finally { try { outputStream.close(); } catch (IOException e1) { e1.printStackTrace(); } } } } catch (FileNotFoundException e1) { e1.printStackTrace(); } } }); final Button restoreButton = new Button(buttons, SWT.NONE); restoreButton.setText(restore); restoreButton.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { GridColumn[] columns = v.getGrid().getColumns(); for (GridColumn gridColumn : columns) { gridColumn.dispose(); } for (int i = 0; i < NUM_COLUMNS; i++) { createColumn(v, "Column " + i); } v.setInput(createModel()); v.getGrid().setItemCount(10); v.getGrid().redraw(); v.getGrid().layout(); shell.layout(); } }); final Button enableDisableKeyListenerButton = new Button(buttons, SWT.NONE); enableDisableKeyListenerButton.setText("Disable default key listener"); enableDisableKeyListenerButton.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { if (enable) { v.getGrid().disableDefaultKeyListener(); enable = false; enableDisableKeyListenerButton.setText("Enable default key listener"); } else { v.getGrid().enableDefaultKeyListener(); enable = true; enableDisableKeyListenerButton.setText("Disable default key listener"); } } }); Button gcButton = new Button(buttons, SWT.NONE); gcButton.setText("gc"); gcButton.addMouseListener(new MouseAdapter() { @Override public void mouseDown(MouseEvent e) { System.gc(); } }); } MyModel[] model = createModel(); v.setInput(model); v.getGrid().setLinesVisible(true); v.getGrid().setHeaderVisible(true); } private void createColumn(final GridTableViewer v, String name) { GridColumn column = new GridColumn(v.getGrid(), SWT.NONE); column.setWidth(200); column.setText(name); } private MyModel[] createModel() { MyModel[] elements = new MyModel[NUM_MODELS]; for (int i = 0; i < NUM_MODELS; i++) { elements[i] = new MyModel(i); } return elements; } /** * @param args */ public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new GridViewerSnippetDisposePerformance(shell, true); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }