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The source code/******************************************************************************* * 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 *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import java.util.ArrayList; import java.util.Iterator; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.StructuredViewer; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; /** * A simple TableViewer to demonstrating how viewers could be refresh and * scrolling avoided in 3.2. In 3.3 implementors should consider using the * {@link StructuredViewer#refresh(boolean, boolean)} instead. * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet022TableViewerRefreshNoScroll { private class MyContentProvider implements IStructuredContentProvider { /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) */ public Object[] getElements(Object inputElement) { ArrayList list = (ArrayList) inputElement; list.add(new MyModel(list.size())); return list.toArray(); } /* * (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 Snippet022TableViewerRefreshNoScroll(Shell shell) { shell.setLayout(new GridLayout(2, false)); final TableViewer v = new TableViewer(shell, SWT.BORDER | SWT.FULL_SELECTION); TableColumn column = new TableColumn(v.getTable(), SWT.NONE); column.setWidth(200); v.setLabelProvider(new LabelProvider()); v.setContentProvider(new MyContentProvider()); v.setInput(createModel(100)); v.getTable().setLinesVisible(true); v.getTable().setLayoutData( new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1)); Button b = new Button(shell, SWT.PUSH); b.setText("Refresh with Scrolling"); b.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { v.refresh(); } }); b = new Button(shell, SWT.PUSH); b.setText("Refresh with NO-Scrolling"); b.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { v.getTable().setTopIndex(0); IStructuredSelection selection = (IStructuredSelection) v .getSelection(); v.getTable().deselectAll(); v.refresh(); if (!selection.isEmpty()) { int[] indices = new int[selection.size()]; Iterator it = selection.iterator(); TableItem[] items = v.getTable().getItems(); Object modelElement; int counter = 0; while (it.hasNext()) { modelElement = it.next(); for (int i = 0; i < items.length; i++) { if (items[i].getData() == modelElement) { indices[counter++] = i; } } } if (counter < indices.length) { System.arraycopy(items, 0, indices = new int[counter], 0, counter); } v.getTable().select(indices); } } }); } private ArrayList createModel(int size) { ArrayList elements = new ArrayList(); for (int i = 0; i < size; i++) { elements.add(new MyModel(i)); } return elements; } /** * @param args */ public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); new Snippet022TableViewerRefreshNoScroll(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } } |
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