为什么这个libreoffice Edit控件事件处理程序不起作用

Question

我需要以编程方式创建此对话框，因为根据客户端的不同，它将具有可变数量的控件。 （现在的命名约定很草率，因为我正在中间调整其他人的代码。）当输入focusGained子代码时，代码会阻塞（请参阅下文）。

我已经尝试了很多事情，但是特别需要注意的是：如果我更改相关行来代替处理textChanged事件，则所有这些工作都可以按预期进行。

Sub main

    Dim dlgmodel As Variant
    Dim oComponents As Variant
    Dim oDoc As Variant

    dlgmodel = CreateUnoService("com.sun.star.awt.UnoControlDialogModel")
    With dlgmodel
        .Name = "checkwriter"
        .Title = "check writer"
        .PositionX = 170
        .PositionY = 70
        .Width = 190
        .Height = 100
        .DesktopAsParent = false ' or true, does not affect problem
    End With

    Dim oModel As Variant

    oModel = dlgmodel.createInstance("com.sun.star.awt.UnoControlGroupBoxModel")
    omodel.name = "rbgroup"
    dlgmodel.insertByName(oModel.Name, oModel)

    dim j%

    for j = 0 to 3         ' 3 is for example
        oModel = dlgmodel.createInstance("com.sun.star.awt.UnoControlRadioButtonModel")
        With oModel
            .Name = "rb" & j
            .PositionX = 10
            .PositionY = 6 + j * 15
            .Width = 12
            .Height = 12
            .groupname = "rbgroup"
        End With
        dlgmodel.insertByName(oModel.Name, oModel)

        oModel = dlgmodel.createInstance("com.sun.star.awt.UnoControlEditModel")
        with omodel
            .Name = "txt" & j
            .PositionX = 40
            .PositionY = 6 + j * 15
            .Width = 40
            .Height = 12
        end with
        dlgmodel.insertByName(oModel.Name, oModel)
    next

    Dim oDlg As Variant
    oDlg = CreateUnoService("com.sun.star.awt.UnoControlDialog")
    oDlg.setModel(dlgmodel)


    Dim oControl As Variant
    oListener = CreateUnoListener("txt_", "com.sun.star.awt.XFocusListener")

    oControl = oDlg.getControl("txt0")           ' testing one single edit control
    ocontrol.addFocusListener(oListener)

    Dim oWindow As Variant
    oWindow = CreateUnoService("com.sun.star.awt.Toolkit")

    oDlg.createPeer(oWindow, null)

    oDlg.execute()
End Sub

'entering focusGained() causes
' "BASIC runtime error. Property or method not found: $(ARG1)."
' after clearing that, the print statement executes.
' ***warning*** without the print statement the dialog will become uncloseable.

sub txt_focusGained(event as object)
    print "txt1" 
end sub

Answer 1

接口com.sun.star.awt.XFocusListener需要两种方法。您仅实现了其中之一，这就是发生错误的原因。

要修复它，请添加以下内容：

sub txt_focusLost(event as object)
    print "txt2" 
end sub

但是，您确定要焦点监听器吗？正如您将看到的那样，修改后的代码将导致无限循环。焦点通常比较棘手，并且根据操作系统的不同而有所不同。通常我改用textChanged。

Answer 2

此处有示例的解决方案的详细信息

https://ask.libreoffice.org/en/question/218979/why-is-this-edit-control-event-handler-not-working/