如何從java中的formAttachment讀取值？

Question

如何從Java中的formAttachment讀取值？

這裏是我的代碼：

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); 

結果：

Answer 1

FormAttachment s的用來定位Control。您可以通過使用左側，頂部，右側或底部的FormAttachment來修復控件的邊緣。所有剩餘的邊自動計算。 最簡單的可能性是相對於周圍複合材料邊緣的百分比定位。這裏有一個例子：

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可以使用構造器new FormAttachment(control, offset, alignment)修復控制relativ的邊緣到另一個控制的邊緣：

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); 

有拉爾夫一個很好的Eclipse RCP手冊Ebert here。不幸的是它是用德語。但是，您可以在第56-57頁上找到解釋上述示例的圖像。