1.使用marginWidth,marginHeight设置边距
这两个属性用来设置容器的左边距和上边距(单位:像素).下面给出一个具体的实例:
1 public class FormLayout1 {
2 public static void main(String[] args) {
3 final Display display = Display.getDefault();
4 final Shell shell = new Shell();
5 shell.setSize(327, 253);
6 shell.setText("SWT Application");
7 // ------------------新插入的界面核心代码------------------------
8 FormLayout formLayout = new FormLayout();
9 formLayout.marginWidth = 100;
10 formLayout.marginHeight = 50;
11 shell.setLayout(formLayout);
12 new Button(shell, SWT.NONE).setText("button1");
13 // ------------------END---------------------------------------------
14 shell.layout();
15 shell.open();
16 while (!shell.isDisposed()) {
17 if (!display.readAndDispatch()) {
18 display.sleep();
19 }
20 }
21 }
22 }
2.使用FormData的构造函数
FromLayout也有自己的布局数据类FormData,它的使用方法是:new FormData()或者new FormData(int width,int height)
1 public class FormData1 {
2 public static void main(String[] args) {
3 final Display display = Display.getDefault();
4 final Shell shell = new Shell();
5 shell.setSize(327, 253);
6 shell.setText("SWT Application");
7 // ------------------新插入的界面核心代码------------------------
8 shell.setLayout(new FormLayout());
9 // new FormData ()
10 Button button1 = new Button(shell, SWT.NONE);
11 button1.setText("button1");
12 FormData formData = new FormData();
13 button1.setLayoutData(formData);
14 // new FormData (int width, int height)，单位：像素
15 Button button2 = new Button(shell, SWT.NONE);
16 button2.setText("button2");
17 FormData formData2 = new FormData(200, 50);// button2变成200长，50宽
18 button2.setLayoutData(formData2);
19 // ------------------END---------------------------------------------
20 shell.layout();
21 shell.open();
22 while (!shell.isDisposed()) {
23 if (!display.readAndDispatch()) {
24 display.sleep();
25 }
26 }
27 }
28 }
3.FormAttachment类的用法:
FromAttachment是在FormData下的,更进一步的布局数据类.它的用法体现在他不同的构造函数中.
(1) new FormAttachment(int numerator,int offset)
button1的顶边(fromData.top)离shell容器的空白边距是shell容器总体空白长度的60%.
偏移的点数(points)为0,效果如下:
1 //>>>>>>>>>>>>>>>华丽丽的分割线>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2 shell.setLayout(new FormLayout());
3 new Text(shell, SWT.BORDER).setText("text1");
4 //将button1应用FormData
5 Button button1 = new Button(shell, SWT.NONE);
6 button1.setText("button1");
7
8 FormData formData = new FormData();
9 formData.top = new FormAttachment(60, 0); // button1的顶端应用FormAttachment设置
10 button1.setLayoutData(formData);
11
12 //>>>>>>>>>>>>>>>华丽丽的分割线>>>>>>>>>>>>>>>>>>>>>>>>>>>>
如果改成了 formData.top = new FormAttachment(60, 30)
从图中更以看出FormAttachment(60,30)是先按照FormAttachment(60,0)
的方式布局后,再下移动10个像素.这个地方有一个布局的次序.
new FormAttachment(int numerator)相当于new FormAttachment(int numerator,int offset)
当offset=0时,new FormAttachment(int numerator,int offset)相当于FormAttachmetn(int numerator,int denominator,int offset)当denominator(分母的意思)=100时,其中denominator是分母,例如FormAttachment(30,50,0)就是长度比例为30/50=60%,也就是和FormAttachment(60,0)的效果是一样的.
(2) new FormAttachment(Control control,int offset,int alignment)
参数1是一个Control类,一般在使用的时候,都传入一个组件(如文本框来做参数),应用此FormAttachment的组件将
依据参数1的contorl为基准来布局,offset为离control偏移量(单位:像素),alignment为对齐方式.
下面给出一个例子:
1 //======================华丽丽的分割线===========================
2 shell.setLayout(new FormLayout());
3 Text text1 = new Text(shell, SWT.BORDER);
4 text1.setLayoutData(new FormData(100, 50));
5 //定义并设置FormData
6 FormData formData = new FormData();
7 //以text1为基准偏移50像素
8 FormAttachment formAttachment = new FormAttachment(text1,50);
9 formData.top = formAttachment;
10 formData.left = formAttachment;
11 // 将button1应用FormData
12 Button button1 = new Button(shell, SWT.NONE);
13 button1.setText("button1");
14 button1.setLayoutData(formData);
15 //======================华丽丽的分割线===========================
new FormAttachment(text1,50,int alignment)中alignment的设置的效果如图所示,
表中的效果的程序就是按照上面的代码为基础修改"FormAttachment formAttachment = new FormAttachment(text1,50);"
这一句得到的.
