horizo​​ntalSpan在SWT GridLayout中不跨越

Question

我想配置像這樣的對話窗口：

@Override 
protected Control createDialogArea(Composite parent) { 


    GridLayout dialogAreaLayout = new GridLayout(); 
    dialogAreaLayout.numColumns = 2; 
    parent.setLayout(dialogAreaLayout); 


    GridData gridData = new GridData(); 
    gridData.grabExcessHorizontalSpace = true; 
    gridData.horizontalAlignment = GridData.FILL; 
    gridData.minimumWidth = 300; 

    // the label in the first row should span across both columns 
    gridData.horizontalSpan = 2; 

    Label headlineLabel = new Label(parent, SWT.NONE); 
    headlineLabel.setText("example test"); 
    headlineLabel.setLayoutData(gridData); 

    // the rest should be ordered in two columns 
    gridData.horizontalSpan = 1; 

    companyLabel = new Label(parent, SWT.NONE); 
    companyLabel("company"); 

    companyTextfield = new Text(parent, SWT.BORDER); 
    companyTextfield(gridData); 

...

我試圖做到的是一個標籤在第一橫跨兩列，並且每行對成對地排列以下字段。我得到的結果是，標籤（應該留在第二行）在第一行是正確的，就像標籤不會跨越兩列一樣。任何人都可以看到，我做錯了什麼？

再次感謝！

Answer 1

將layoutData設置爲headlineLabel之後，您將horizo​​ntalSpan設置爲1.您需要爲每個SWT小部件創建一個新的LayoutData對象。設置它們後不可能重複使用它們。