如何从java中的formAttachment读取值？

Question

如何从Java中的formAttachment读取值？

这里是我的代码：

Text one = new Text(composite, SWT.BORDER); 
data = new FormData(); 
data.top = new FormAttachment(0, 0); 
data.bottom = new FormAttachment(100, 0); 
data.left = new FormAttachment(0, 0); 
data.right = new FormAttachment(sash, 0); 
one.setLayoutData(data); 

结果：

Answer 1

FormAttachment s的用来定位Control。您可以通过使用左侧，顶部，右侧或底部的FormAttachment来修复控件的边缘。所有剩余的边自动计算。 最简单的可能性是相对于周围复合材料边缘的百分比定位。这里有一个例子：

FormData formData = new FormData(); 
// Fix the left edge of the control to 25% of the overall width + 10px offset. 
formData.left = new FormAttachment(25, 10); 
// Fix the lower edge of the control to 75% of the overall height + 0px offset. 
formData.bottom = new FormAttachment(75); 
// Tell the control its new position. 
control.setLayoutData(formData); 

Alternativelyyou可以使用构造器new FormAttachment(control, offset, alignment)修复控制relativ的边缘到另一个控制的边缘：

FormData formData = new FormData(); 
// Fix left edge 10px to the right of the right edge of otherControl 
formData.left = new FormAttachment(otherControl, 10, SWT.RIGHT); 
// Fix bottom edge at exactly the same height as the one of otherControl 
formData.bottom = new FormAttachment(otherControl, 0, SWT.BOTTOM); 
control.setLayoutData(formData); 

有拉尔夫一个很好的Eclipse RCP手册Ebert here。不幸的是它是用德语。但是，您可以在第56-57页上找到解释上述示例的图像。