布局實施 1.首先定義窗口和它的空白邊 Display.getDefault().dispose(); //移去平臺核心啟動畫面 display = new Display(); shell = new Shell(display, SWT.TITLE); FormLayout layout = new FormLayout(); layout.marginHeight = 10; layout.marginWidth = 20; shell.setLayout(layout); shell.setText("用戶登錄");
2.創建窗口上的元素，其中下面的兩個button由一個使用RowLayout的組件來包容。 name = new Label(shell, SWT.NONE); name.setText("用戶名"); nameText = new Text(shell, SWT.SINGLE SWT.BORDER); pass = new Label(shell, SWT.NONE); pass.setText("密碼"); passText = new Text(shell, SWT.SINGLE SWT.BORDER); passText.setEchoChar(´*´); passText.setTabs(2); bottom = new Composite(shell, SWT.NONE); RowLayout rowLayout = new RowLayout(); rowLayout.justify = true; //justify定義組件在容器中分散開，效果類似于swing的FlowLayout bottom.setLayout(rowLayout);
3.定義name標簽的位置。它的頂邊離父組件（窗口shell）的空白邊距離是父組件clientArea（除空白邊以外的空間）高度(height)的15%，偏移的點數(points)為0。 FormData data = new FormData(); data.top = new FormAttachment(15, 0); name.setLayoutData(data);
4.定義name文本輸入的位置。它的頂邊在name標簽的中心位置（這不是正確的表達，但程序是這樣解釋，事實上它的中心位置與name標簽在同一條水平線上），左邊距name標簽的右邊有10個點。 data = new FormData(); data.top = new FormAttachment(name, 0, SWT.CENTER); data.left = new FormAttachment(name, 10, SWT.RIGHT); nameText.setLayoutData(data);
5.定義pass標簽的位置。它的頂邊距name標簽的底邊有10個點數的偏移。 data = new FormData(); data.top = new FormAttachment(name, 10, SWT.BOTTOM); pass.setLayoutData(data);
6.定義pass文本輸入的位置。它的頂邊在name標簽的中心位置（同上），左邊與name文本框的左邊對齊。 data = new FormData(); data.top = new FormAttachment(pass, 0, SWT.CENTER); data.left = new FormAttachment(nameText, 0, SWT.LEFT); passText.setLayoutData(data);
7.定義bottom組件的位置。它的頂邊距pass標簽的底邊15個點數，左邊與pass標簽的左邊對齊，右邊與pass文本輸入的右邊對齊。 data = new FormData(); data.top = new FormAttachment(pass, 15, SWT.BOTTOM); data.left = new FormAttachment(pass, 0, SWT.LEFT); data.right = new FormAttachment(passText, 0, SWT.RIGHT); bottom.setLayoutData(data);
/** * @author efly * @version 1.0.0,11/22/02 */ public final class LoginUI { PRivate Display display; private Shell shell; private Composite bottom; private Label name; private Label pass; private Text nameText; private Text passText; private Button ok; private Button exit; private Rectangle clientArea; private RootHook rootHook;
public LoginUI(Hook hook) { rootHook = (RootHook) hook; }
/** * 顯示登陸界面 */ public void show() { Display.getDefault().dispose(); display = new Display(); clientArea = display.getClientArea(); shell = new Shell(display, SWT.TITLE); FormLayout layout = new FormLayout(); layout.marginHeight = 10; layout.marginWidth = 20; shell.setLayout(layout); shell.setText("用戶登錄");
name = new Label(shell, SWT.NONE); name.setText("用戶名"); nameText = new Text(shell, SWT.SINGLE SWT.BORDER); pass = new Label(shell, SWT.NONE); pass.setText("密碼"); passText = new Text(shell, SWT.SINGLE SWT.BORDER); passText.setEchoChar(´*´); passText.setTabs(2); bottom = new Composite(shell, SWT.NONE); RowLayout rowLayout = new RowLayout(); rowLayout.justify = true; bottom.setLayout(rowLayout); ok = new Button(bottom, SWT.PUSH); ok.setText("確定"); ok.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { ok(); } }); exit = new Button(bottom, SWT.PUSH); exit.setText("取消"); exit.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { cancel(); } });
FormData data = new FormData(); data.top = new FormAttachment(15, 0); name.setLayoutData(data);
data = new FormData(); data.top = new FormAttachment(name, 0, SWT.CENTER); data.left = new FormAttachment(name, 10, SWT.RIGHT); nameText.setLayoutData(data);
data = new FormData(); data.top = new FormAttachment(name, 10, SWT.BOTTOM); pass.setLayoutData(data);
data = new FormData(); data.top = new FormAttachment(pass, 0, SWT.CENTER); data.left = new FormAttachment(nameText, 0, SWT.LEFT); passText.setLayoutData(data);
data = new FormData(); data.top = new FormAttachment(pass, 15, SWT.BOTTOM); data.left = new FormAttachment(pass, 0, SWT.LEFT); data.right = new FormAttachment(passText, 0, SWT.RIGHT); bottom.setLayoutData(data);
