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Thread: back color of MDI Parent form

  1. Nov 12th, 2003, 03:16 PM #1
    luckydogsystems
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    Question back color of MDI Parent form

    What is the secret to changing the backcolor property of an MDI Parent form in VB.NET?

    Changing this property does not change the back color of an MDI Parent form.backcolor
    Regards,

    Al Williams
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  2. Nov 13th, 2003, 01:54 AM #2
    dynamic_sysop
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    you could try handling the Paint event in a new Thread, here's a quick working example i knocked up....
    VB Code:
    1. [Color=Blue]Private[/COLOR] [Color=Blue]Sub[/COLOR] Form1_Paint([Color=Blue]ByVal[/COLOR] sender [Color=Blue]As[/COLOR] [Color=Blue]Object[/COLOR], [Color=Blue]ByVal[/COLOR] e [Color=Blue]As[/COLOR] System.Windows.Forms.PaintEventArgs) [Color=Blue]Handles[/COLOR] [Color=Blue]MyBase[/COLOR].Paint

    2.           [Color=Blue]Dim[/COLOR] t [Color=Blue]As[/COLOR] [Color=Blue]New[/COLOR] Threading.Thread([Color=Blue]AddressOf[/COLOR] pnt)

    3.           t.Start()

    4.       [Color=Blue]End[/COLOR] [Color=Blue]Sub

    5. [/COLOR] [Color=Blue][/COLOR] [Color=Blue]

    6. [/COLOR] [Color=Blue][/COLOR] [Color=Blue][/COLOR]    [Color=Blue]Sub[/COLOR] pnt()

    7.           [Color=Blue]Dim[/COLOR] bmp [Color=Blue]As[/COLOR] [Color=Blue]New[/COLOR] Bitmap([Color=Blue]MyBase[/COLOR].Width, [Color=Blue]MyBase[/COLOR].Height)

    8.           bmp.SetResolution(1, 1)

    9.           [Color=Blue]Dim[/COLOR] g [Color=Blue]As[/COLOR] Graphics = Graphics.FromImage(bmp)

    10.           g.FillRectangle([Color=Blue]New[/COLOR] SolidBrush(Color.AntiqueWhite), g.ClipBounds)

    11.           g.Dispose()

    12.           [Color=Blue]MyBase[/COLOR].BackgroundImage = bmp

    13.           Application.DoEvents()

    14.       [Color=Blue]End[/COLOR] [Color=Blue]Sub

    15. [/COLOR]
    ~
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  3. Nov 14th, 2003, 11:05 AM #3
    Hole-In-One
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    This works too and is a little easier


    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

    Dim ctl as Control
    For each ctl in me.controls
    If type of ctl is mdiclient then
    ctl.backcolor = color.fromknowncolor(knowncolor.control)
    Enf If
    Next

    End Sub
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  4. Nov 14th, 2003, 01:29 PM #4
    dynamic_sysop
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    Originally posted by Hole-In-One
    This works too and is a little easier


    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

    Dim ctl as Control
    For each ctl in me.controls
    If type of ctl is mdiclient then
    ctl.backcolor = color.fromknowncolor(knowncolor.control)
    Enf If
    Next

    End Sub

    a Form isn't a Control , so For each ctl in me.controls wont find the Form , but even if it could , you cant set the Color of an MDI Form with " .backcolor " , they want to change the backcolor of an MDI Form ....
    What is the secret to changing the backcolor property of an MDI Parent form in VB.NET?
    the only way to change it is through graphics or some serious Subclassing.
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  6. Nov 14th, 2003, 01:47 PM #5
    Hole-In-One
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    See this:

    http://vbforums.com/showthread.php?s...=backcolor+mdi

    It does work!
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  7. Nov 14th, 2003, 02:05 PM #6
    Edneeis
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    As crazy as it sounds Hole-In-One's code does work I found the samething here:
    http://www.dotnet247.com/247referenc.../13/66667.aspx

    Although I used it in the ControlAdded event to avoid looping too often, although it is the exact samething.
    VB Code:
    1. Private Sub Form2_ControlAdded(ByVal sender As Object, ByVal e As System.Windows.Forms.ControlEventArgs) Handles MyBase.ControlAdded

    2.         If TypeOf e.Control Is MdiClient Then

    3.             e.Control.BackColor = Me.BackColor

    4.         End If

    5.     End Sub

    Sorry i was a bit slow and didn't see your post Hole.
    Last edited by Edneeis; Nov 14th, 2003 at 03:21 PM.
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  8. Nov 14th, 2003, 03:14 PM #7
    nemaroller
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    What, were we all surprised to learn a Form is actually derived from Control?
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