Question

我正在创建一个桌面是MDI父表单的VOS。但是，只要我显示任何子窗口，它们就会出现，加载所有资源然后再次隐藏。而且他们不会显示出来。

显示应用的代码：

Private Sub PictureBox1_Click(sender As Object, e As EventArgs) Handles PictureBox1.Click, Label1.Click, TestToolStripMenuItem.Click
        showapp(Maininternet)
    End Sub

''' <summary>
    ''' Add's an app to the Galaxy OS MDI child tree and shows it.
    ''' </summary>
    ''' <param name="app">Name of the app.</param>
    ''' <remarks></remarks>
    Sub showapp(app As Form)
        AddNewForm(app)
        app.Show()
    End Sub

在其中一个模块中：

''' <summary>
    ''' Adds a form to the MDI application
    ''' And links it with a TaskBarItem
    ''' </summary>
    ''' <param name="frm">The form to use</param>
    ''' <remarks></remarks>
    Private Sub AddNewForm(ByVal frm As Form)
        frm.MdiParent = GalaxyOS.Core.GUI.Desktop

        Dim img As Image = CType(New ImageConverter().ConvertFrom(frm.Icon), Image)

        Dim tbItem As New TaskBarItem(frm.Text, img, frm)
        tbItem.ImageScaling = ToolStripItemImageScaling.SizeToFit
        TaskBar.Items.Add(tbItem)

        frm.Show()
    End Sub

由于它是一个操作系统，有一个menustrip就像一个任务栏，而TaskBarItem是一个MenuStrip项，显示一个应用程序的图标，它的名称，以及关闭和恢复它的选项。代码：

Namespace Core.GUI.Desktop.Taskbar
''' <summary>
''' The TaskBarItem class is a item on the TaskBar that can close/restore a application
''' It represents the form's icon and text on the visual side
''' </summary>
''' <remarks></remarks>
Public Class TaskBarItem
    Inherits ToolStripMenuItem

    Private WithEvents CloseItem As New ToolStripMenuItem("Close")
    Private WithEvents RestoreItem As New ToolStripMenuItem("Restore")
    Friend WithEvents Control1 As System.Windows.Forms.Control

    Private _form As Form


    ''' <summary>
    ''' Creates a new instance of the TaskBarItem class
    ''' </summary>
    ''' <param name="text">The text used on the item</param>
    ''' <param name="img">The image used on the item</param>
    ''' <param name="frm">The form that is linked to it</param>
    ''' <remarks></remarks>
    Public Sub New(ByVal text As String, ByVal img As Image, ByVal frm As Form)
        MyBase.New(text, img)
        CloseItem.BackColor = color.black
        CloseItem.ForeColor = color.deepskyblue
        RestoreItem.BackColor = color.black
        RestoreItem.ForeColor = color.deepskyblue
        BackColor = color.black
        ForeColor = color.deepskyblue
        _form = frm
        AddHandler CloseItem.Click, AddressOf Close_Click
        AddHandler RestoreItem.Click, AddressOf Restore_Click

        AddHandler frm.FormClosing, AddressOf Form_Closed

        Me.DropDownItems.Add(CloseItem)
        Me.DropDownItems.Add(RestoreItem)
        frm.Show()
    End Sub

    '' A event to remove the item when the form has been closed by the close button
    '' or a internal Form.Close call
    Private Sub Close_Click(ByVal sender As Object, ByVal e As EventArgs)
        Me.Parent.Items.Remove(Me)
        If (Not IsNothing(_form)) Then
            _form.Close()
        End If
    End Sub

    '' A event to restore the form's previous state
    Private Sub Restore_Click(ByVal sender As Object, ByVal e As EventArgs)
        If (_form.WindowState = FormWindowState.Minimized) Then
            _form.WindowState = FormWindowState.Normal
            _form.Visible = True
        End If
    End Sub

    '' A event to close the form using the TaskBarItem
    Private Sub Form_Closed(sender As Object, e As FormClosingEventArgs)
        For Each tsmi As ToolStripMenuItem In GalaxyOs.Core.GUI.Desktop.Desktop.TaskBar.Items
            If (tsmi.Text = _form.Text) Then
                Me.Parent.Items.Remove(tsmi)
                Exit For
            End If
        Next
    End Sub
End Class
End Namespace

我是一个完整的菜鸟，我真的被困在这......

任何帮助都非常感激，哈姆扎阿里

Answer 1

我想出了问题！问题是，我在MDI父表单上有一个flowlayoutpanel，它位于前台，让MDI子项显示在后台。有没有什么方法可以使FlowLayoutPanel不受MDI孩子的影响？

谢谢，哈姆扎阿里

MDI子表单永远不会出现

1 个答案: