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SWT中的布局之-----FormLayout(表格式布局)
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 = http://www.mamicode.com/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 = http://www.mamicode.com/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 = http://www.mamicode.com/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FormData12 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.
SWT中的布局之-----FormLayout(表格式布局)