Swt jface 提供了virtual table 和 virtual tree（转）
使用虚拟表和虚拟树的确可以很大程度地提供UI界面的性能,尤其是在大数据量的情况下，对于TableViewer使用虚拟表很简单，只要在创建TableViewer的时候指定SWT.VIRTUAL即可
tableViewer = new TableViewer(container, SWT.FULL_SELECTION| SWT.BORDER | SWT.HIDE_SELECTION|SWT.VIRTUAL);
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在以前的版本，TableViewer要使用virtual table的时候，需要实现ILazyContentProvider接口，但是目前好像是不用了，下面附上两个eclipse社区提供的例子
Snippet030VirtualLazyTableViewer.java,使用的是实现ILazyContentProvider接口
import org.eclipse.jface.viewers.ILazyContentProvider;import org.eclipse.jface.viewers.IStructuredContentProvider;import org.eclipse.jface.viewers.LabelProvider;import org.eclipse.jface.viewers.TableViewer;import org.eclipse.jface.viewers.Viewer;import org.eclipse.swt.SWT;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;/*** A simple TableViewer to demonstrate usage of an ILazyContentProvider. You can compare this snippet to the Snippet029VirtualTableViewer* to see the small but needed difference.** @author Tom Schindl <tom.schindl@bestsolution.at>**/public class Snippet030VirtualLazyTableViewer {private class MyContentProvider implements IStructuredContentProvider, ILazyContentProvider {private TableViewer viewer;private MyModel[] elements;public MyContentProvider(TableViewer viewer) {this.viewer = viewer;}/* (non-Javadoc)* @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)*/public Object[] getElements(Object inputElement) {return elements;}/* (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) {this.elements = (MyModel[])newInput;}public void updateElement(int index) {viewer.replace(elements[index], index);}}public class MyModel {public int counter;public MyModel(int counter) {this.counter = counter;}public String toString() {return "Item " + this.counter;}}public Snippet030VirtualLazyTableViewer(Shell shell) {final TableViewer v = new TableViewer(shell,SWT.VIRTUAL);v.setLabelProvider(new LabelProvider());v.setContentProvider(new MyContentProvider(v));v.setUseHashlookup(true);MyModel[] model = createModel();v.setInput(model);v.setItemCount(model.length); // This is the difference when using a ILazyContentProviderv.getTable().setLinesVisible(true);}private MyModel[] createModel() {MyModel[] elements = new MyModel[10000];for( int i = 0; i < 10000; 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 Snippet030VirtualLazyTableViewer(shell);shell.open ();while (!shell.isDisposed ()) {if (!display.readAndDispatch ()) display.sleep ();}display.dispose ();}}?
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Snippet029VirtualTableViewer.java 更加方便，直接指定SWT.VIRTUAL即可
import org.eclipse.jface.viewers.IStructuredContentProvider;import org.eclipse.jface.viewers.LabelProvider;import org.eclipse.jface.viewers.TableViewer;import org.eclipse.jface.viewers.Viewer;import org.eclipse.swt.SWT;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;/*** A simple TableViewer to demonstrate the usage of a standard content provider* with a virtual table** @author Tom Schindl <tom.schindl@bestsolution.at>**/public class Snippet029VirtualTableViewer {private class MyContentProvider implements IStructuredContentProvider {private MyModel[] elements;/** (non-Javadoc)** @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)*/public Object[] getElements(Object inputElement) {return elements;}/** (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) {this.elements = (MyModel[]) newInput;}}public class MyModel {public int counter;public MyModel(int counter) {this.counter = counter;}public String toString() {return "Item " + this.counter;}}public Snippet029VirtualTableViewer(Shell shell) {long time1=System.currentTimeMillis();final TableViewer v = new TableViewer(shell,SWT.VIRTUAL);v.setLabelProvider(new LabelProvider());v.setContentProvider(new MyContentProvider());v.setUseHashlookup(true);MyModel[] model = createModel();v.setInput(model);v.getTable().setLinesVisible(true);System.out.println(System.currentTimeMillis()-time1);}private MyModel[] createModel() {MyModel[] elements = new MyModel[10000];for (int i = 0; i < 10000; 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 Snippet029VirtualTableViewer(shell);shell.open();while (!shell.isDisposed()) {if (!display.readAndDispatch())display.sleep();}display.dispose();}}?
来源网址：http://www.blogjava.net/cherishchen/archive/2007/06/26/126271.aspx