有的時候我們需要這樣的功能，記下Dialog中的值，當再次打開這個Dialog的時候，還原這些值。這就需要把這些Dialog的值保存起來。Dialog的IDialogSettings類提供了這個功能。下邊是使用方法:
在上例"自定義Dialog"的代碼上加入三個函數：

public ? void ?saveState() {
???????? if ?(text.getText()? == ? null ? || ?text.getText().equals( "" )) {
???????????? return ?;
????????}
????????IDialogSettings?topSettings? = ?getTopSettings();
????????IDialogSettings?settings? = ??topSettings.getSection( " TestDialog " );
???????? if (settings? == ? null )settings? = ?topSettings.addNewSection( " TestDialog " );
????????settings.put( " value " ,?text.getText());
???????? try {
????????????topSettings.save( " content/system.xml " );
????????} catch (IOException?e) {
????????????System.out.println(e.getMessage());
????????}
????}
???? public ? void ?restoreState() {
????????IDialogSettings?topSettings? = ?getTopSettings();
????????IDialogSettings?settings? = ??topSettings.getSection( " TestDialog " );
???????? if (settings? == ? null )? return ;
???????? if ?(text.getText()? == ? null ? || ?text.getText().equals( "" )) {
????????????text.setText(settings.get( " value " ));
????????}
????}
???? public ?IDialogSettings?getTopSettings() {
????????IDialogSettings?topSettings? = ? new ?DialogSettings( " system " );
???????? try {
????????????topSettings.load( " content/system.xml " );
????????} catch (IOException?e) {
????????????System.out.println(e.getMessage());
????????}
???????? return ?topSettings;
????}

然后在覆寫的buttonPressed函數中調用save

protected ? void ?buttonPressed( int ?button) {
????????saveState();
????}

在createDialogArea函數中加入取出數據

protected ?Control?createDialogArea(Composite?parent)? {
????????Composite?container? = ?(Composite)? super .createDialogArea(parent);
????????container.setLayout( new ?RowLayout());
????????text? = ? new ?Text(container,?SWT.BORDER);
????????text.setLayoutData( new ?RowData( 100 , - 1 ));
???????? // 加入這一句
???????? if ?(text.getText()? == ? null ? || ?text.getText().equals( "" )) {
????????????restoreState();
????????}
???????? return ?container;
????}

最后，記得建立需要的文件，在當前workspace下建立文件夾content,然后在文件夾下建立system.xml文件。當然你也可以利用程序來實現。
運行一下看看吧，是不是記住了上次填入的內容.

給自定義Dialog加入保留對話框值的功能