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Thread: [2005] ListView Gridlines color

  1. #1

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    PowerPoster BruceG's Avatar
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    [2005] ListView Gridlines color

    Is there a way to change the color of the listview gridlines (black would be nice)? I have Gridlines = True, but the color is so faint that they cannot be seen (for example on Win XP with the default Blue theme). You can only see them on a highlighted item. (If I change the backcolor of the LV to a funky color, I can see them, but I want to keep the default color of "Window" (white when Win XP default them is used).

    Your ideas are appreciated.
    Thanks,
    Bruce
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  2. #2
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    Re: [2005] ListView Gridlines color

    Probably have to do OwnerDrawing or subclass the listview and intercept the pain message but to determine when its painting the gridlines would be hard.
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  3. #3

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    Re: [2005] ListView Gridlines color

    (sigh) I was afraid of that ...
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    Re: [2005] ListView Gridlines color

    If you subclass, it should be very similar from any solutions you can find in VB 6 as Im sure you know. Perhaps there is something in the lParam or wParam paramteres of the WM_PAINT message call that specifies the gridlines are being drawn. Have you tried looking at Spy++ messages of a demo app to see?
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    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    does the listview gridlines still have that scrolling bug where half your text gets a strikeout look and grid lines don't draw correctly for half of them?

    Last time I tried using gridlines, I found this to be the case, and stopped using them.
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    Re: [2005] ListView Gridlines color

    The only thing I can see in 2008 is a focus rectangle issue where the bottom line isnt drawn.
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  7. #7
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    Rob, perhaps you can confirm if the issue no longer exists in Vista (don't have a Vista box around ATM), but I just tested a .NET 3.5 app on XP, and the issue is still there. You need to have enough items to get a scrollbar, then all you do is scroll to produce the bug.

    It has to do with the repainting. If you drag the scrollbar manually, it will fix, but the issue happens anytime you scroll with the arrows.

    See screenie:
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    Re: [2005] ListView Gridlines color

    No, I had also tried it with more items after I posted to make sure. Under Vista and a new blank 3.5 vb project I can not duplicate your image issue. Using the arrow keys, mouse wheel, or manually dragging the thumb scrollbar, its all good except as originally noted with the bottom focus rectangle issue.

    Edit, I added a second column too populated with test items and still its good.
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  9. #9
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    The bug is probably in the common controls dll which is a different version in Vista. Probably won't see a fix ever for XP.
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    Re: [2005] ListView Gridlines color

    Maybe in SP-3. Do you have SP-3 installed on the system you just tested it on?
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  11. #11
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    yup
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  12. #12

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    Re: [2005] ListView Gridlines color

    Hey guys, I was going back and forth on whether or not to use gridlines as I was also experiencing the scroll issue Matt mentioned. I decided to live with it. But back to the original question about changing the color, is owner drawing / subclassing the only way to go here, and if so, how difficult would it be to implement? (An example would be nice as I am not an expert in the whole owner-drawing / subclassing arena.)
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  13. #13
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    Bruce, I got around to getting you a working sample of custom drawing a listview in details view where you can customize the gridline color.

    It took a little trial and error, as the listview can be a bit odd when it comes to custom drawing its items. However I think this has all the same standard functionality, while still giving you the extra settings you need.

    The new properties exposed by the class are:

    GridLines - shadows the original property, has same result, however when true custom draws the grid
    GridLineColor - color in which to draw the grid lines
    ItemHighlightColor - color to use to highlight selected items
    ItemNotFocusedHighlightColor - color to use to highlight selected items when listview is not focused (and HideSelection set to false)
    UseDefaultGridLines - Set to true to bypass custom gridlines and use original ones

    I didn't fully test in all scenarios (as the listview is pretty robust) but give it a go, and if you need some help let me know.

    All you need to do is paste it into its own class file, and then compile the project, you can then add the new listview class from the toolbox to your form.

    Code:
    Public Class ListViewEx
        Inherits System.Windows.Forms.ListView
    
        Private _gridLines As Boolean = False
        Private _useDefaultGridLines As Boolean = False
        Private _gridLineColor As Color = Color.Black
        Private _itemHighlightColor As Color = Color.FromKnownColor(KnownColor.Highlight)
        Private _itemNotFocusedHighlighColor As Color = Color.FromKnownColor(KnownColor.MenuBar)
    
        Public Property GridLineColor() As Color
            Get
                Return _gridLineColor
            End Get
            Set(ByVal value As Color)
                If value <> _gridLineColor Then
                    _gridLineColor = value
                    If _gridLines Then
                        Me.Invalidate()
                    End If
                End If
            End Set
        End Property
    
        Public Property ItemHighlightColor() As Color
            Get
                Return _itemHighlightColor
            End Get
            Set(ByVal value As Color)
                If value <> _itemHighlightColor Then
                    _itemHighlightColor = value
                    Me.Invalidate()
                End If
            End Set
        End Property
    
        Public Property ItemNotFocusedHighlighColor() As Color
            Get
                Return _itemNotFocusedHighlighColor
            End Get
            Set(ByVal value As Color)
                If value <> _itemNotFocusedHighlighColor Then
                    _itemNotFocusedHighlighColor = value
                    Me.Invalidate()
                End If
            End Set
        End Property
    
        Private ReadOnly Property DrawCustomGridLines() As Boolean
            Get
                Return (_gridLines And Not _useDefaultGridLines)
            End Get
        End Property
    
        Public Shadows Property GridLines() As Boolean
            Get
                Return _gridLines
            End Get
            Set(ByVal value As Boolean)
                _gridLines = value
            End Set
        End Property
    
        Public Property UseDefaultGridLines() As Boolean
            Get
                Return _useDefaultGridLines
            End Get
            Set(ByVal value As Boolean)
                If _useDefaultGridLines <> value Then
                    _useDefaultGridLines = value
                End If
                MyBase.GridLines = value
                MyBase.OwnerDraw = Not value
            End Set
        End Property
    
        Protected Overrides Sub OnDrawColumnHeader(ByVal e As System.Windows.Forms.DrawListViewColumnHeaderEventArgs)
            e.DrawDefault = True
            MyBase.OnDrawColumnHeader(e)
        End Sub
    
        Protected Overrides Sub OnLostFocus(ByVal e As System.EventArgs)
            For Each selectedIndex As Integer In MyBase.SelectedIndices
                MyBase.RedrawItems(selectedIndex, selectedIndex, False)
            Next
            MyBase.OnLostFocus(e)
        End Sub
    
        Protected Overrides Sub OnDrawSubItem(ByVal e As System.Windows.Forms.DrawListViewSubItemEventArgs)
    
    
            Dim drawAsDefault As Boolean = False
            Dim highlightBounds As Rectangle = Nothing
            Dim highlightBrush As SolidBrush = Nothing
    
            'FIRST DETERMINE THE COLOR
            If e.Item.Selected Then
                If MyBase.Focused Then
                    highlightBrush = New SolidBrush(_itemHighlightColor)
                ElseIf HideSelection Then
                    drawAsDefault = True
                Else
                    highlightBrush = New SolidBrush(_itemNotFocusedHighlighColor)
                End If
            Else
                drawAsDefault = True
            End If
    
            If drawAsDefault Then
                e.DrawBackground()
            Else
                'NEXT DETERMINE THE BOUNDS IN WHICH TO DRAW THE BACKGROUND
                If FullRowSelect Then
                    highlightBounds = e.Bounds
                Else
                    highlightBounds = e.Item.GetBounds(ItemBoundsPortion.Label)
                End If
    
                'ONLY DRAW HIGHLIGHT IN 1 OF 2 CASES
                'CASE 1 - FULL ROW SELECT (AND DRAWING ANY ITEM)
                'CASE 2 - NOT FULL ROW SELECT (AND DRAWING 1ST ITEM)
                If FullRowSelect Then
                    e.Graphics.FillRectangle(highlightBrush, highlightBounds)
                ElseIf e.ColumnIndex = 0 Then
                    e.Graphics.FillRectangle(highlightBrush, highlightBounds)
                Else
                    e.DrawBackground()
                End If
            End If
    
            e.DrawText()
    
            If _gridLines Then
                e.Graphics.DrawRectangle(New Pen(_gridLineColor), e.Bounds)
            End If
    
    
            If FullRowSelect Then
                e.DrawFocusRectangle(e.Item.GetBounds(ItemBoundsPortion.Entire))
            Else
                e.DrawFocusRectangle(e.Item.GetBounds(ItemBoundsPortion.Label))
            End If
    
    
            MyBase.OnDrawSubItem(e)
    
        End Sub
    End Class
    also, sorry for lack of comments, but i didn't really have time to put them in. You should be able to tell what is going on though, its not super complicated.
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  14. #14

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    Re: [2005] ListView Gridlines color

    Very nice, Matt. Thanks for taking the time to work this up. This gives me options.
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    Smile Re: [2005] ListView Gridlines color

    Hi Kleinma,

    We have a ListView with the GridLines up/down arrow bug. Do you know if your solution fixes this problem ?

    We have a deadline so I dont have time to test your change just now

    Thanks,

    Jason

  16. #16
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    Yes it does.. you can take the code above and throw it in a project to test it...
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    Re: [2005] ListView Gridlines color

    Kleinma you are a star. Will give it a try.

    Thanks

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    Re: [2005] ListView Gridlines color

    Hello Matt,

    Can you please describe how to use your code? A quick example of a listview and your class together would be a great help. I am still new in VB. Thank you.

  19. #19
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    Quote Originally Posted by fanlx1122 View Post
    Hello Matt,

    Can you please describe how to use your code? A quick example of a listview and your class together would be a great help. I am still new in VB. Thank you.
    Do you know how to use the regular listview?

    My code is nothing more than an extended class of the listview that comes with Visual Studio.

    It works exactly the same way as the standard listview, except it has the 5 additional properties I outlined in my above post that you can set to get the extended behavior.
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    Re: [2005] ListView Gridlines color

    Thanks for replying me quickly.
    I normally use listview by place it from the tool box. Then I add items,, etc. How can I make a listview from you code to the design screen? And then can I set properties from the property window? Thanks.

  21. #21
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    You add a new class file to your project. When it asks for a name for the class, name it ListViewEx (just so you don't have to rename it later if you leave it class1.vb)

    After you do that, it will bring up the code window for that class. Erase the 2 lines of the empty class definition that is generated and paste in my entire code from above which is the entire extended class.

    After that all you need to do is build your project, and ListViewEx will be in the toolbox.
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    Re: [2005] ListView Gridlines color

    Thanks Matt. I think I got it.

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    Re: [2005] ListView Gridlines color

    Hi Matt, I tested your code and found out it only display the horizontal gridlines. Also it does not display gridlines with items that are empty. Is it what you designed or I am using it incorrectly. Thanks.

  24. #24
    Moderator.NET kleinma's Avatar
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    Re: [2005] ListView Gridlines color

    Thats sounds right since this workaround meant custom drawing the actual items with borders around them. So if there is no item, there is no border, so no grid.

    The solution would be to not have any listviewitems that don't have the same number of subitems as the listview has columns. You could add empty string subitems, which should make the grid draw.
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  25. #25
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    Re: [2005] ListView Gridlines color

    Hi

    This will work in vb 2010? coz my columns don't show, also can some1 add border n alt row color options..

  26. #26
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    Re: [2005] ListView Gridlines color

    Hi

    This will work in vb 2010? coz my columns don't show, also can some1 add border n alt row color options..

  27. #27
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    Re: [2005] ListView Gridlines color

    Yes it works in 2010. How can you possibly have alternate rows with different border colours? The borders are shared by the adjoining cells!
    As the 6-dimensional mathematics professor said to the brain surgeon, "It ain't Rocket Science!"

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