[RESOLVED] Tab Control questions.

[Tool]

I am wanting to do a couple things with a tab control.

1) Change the back/fore color of the actual tab in the tabcontrol, not the tabpage background.
2) Handle the MouseDown event of the actual tab, not the tabpage background.

When I do tabPage.ForeColor = Color.Red, it changes the background of the tabpage, and same thing with the MouseDown event. Is there a (somewhat) simple method of doing the above 2 things for the actual tab?

Thanks in advance.

[kleinma]

1) You need to set the drawmode to owner draw, and draw the tabs yourself.
2) I am not sure what you mean by handle the MouseDown of the actual tab. Both the individual tabs, and the tabcontrol itself, have MouseDown events that you can write code in.

[stanav]

Use "owner draw" to do this.... This is a slightly modified version of the example found on MSDN. (You need to set your TabControl's DrawMode property to OwnerDrawFixed, and do the drawing in DrawItem event of the TabControl.)

Private Sub TabControl1_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles TabControl1.DrawItem
        Dim g As Graphics = e.Graphics
        Dim _TextBrush As Brush
        Dim pageNum As Integer = e.Index
        
        ' Get the item from the collection.
        Dim _TabPage As TabPage = TabControl1.TabPages(pageNum)
 
        ' Get the real bounds for the tab rectangle.
        Dim _TabBounds As Rectangle = TabControl1.GetTabRect(pageNum)
 
        If (e.State = DrawItemState.Selected) Then
            ' Draw a different background color, and don't paint a focus rectangle.
            _TextBrush = New SolidBrush(Color.Red)
            g.FillRectangle(Brushes.Yellow, e.Bounds)
        Else
            'The TabControl has 2 TabPages, thus select case only goes to 1.
            'Add more Case if you have more tabpages.
            Select Case pageNum
                Case 0
                    g.FillRectangle(Brushes.Brown, e.Bounds)
                Case 1
                    g.FillRectangle(Brushes.Blue, e.Bounds)
                Case Else
                    g.FillRectangle(Brushes.Green, e.Bounds)
            End Select
            _TextBrush = New System.Drawing.SolidBrush(e.ForeColor)
        End If
 
        ' Use our own font.
        Dim _TabFont As New Font("Times New Roman", 10.0, FontStyle.Bold, GraphicsUnit.Pixel)
 
        ' Draw string. Center the text.
        Dim _StringFlags As New StringFormat()
        _StringFlags.Alignment = StringAlignment.Center
        _StringFlags.LineAlignment = StringAlignment.Center
        g.DrawString(_TabPage.Text, _TabFont, _TextBrush, _TabBounds, New StringFormat(_StringFlags))
    End Sub

[Tool]

Thank you keinma and stanav, I guess ownerdraw is the only way to do it (was hoping it would be a bit easier). That answered my first question.

kleinma:
As for the second question, I want to have a context menu on the tab itself on right click, and close on middle click. Best example I can think of is almost any tabbed web browser.

I created my own class that inherits from TabPage. When I handle MouseDown on that, it only gets called when the TabPage gets the Mouse Down. I am guessing I will have to write my own code to figure out which tab is selected (similar to owner draw and changing the background color of the selected tab). Is this the case, or is there a simpler way of handling that?

[kleinma]

Like I mentioned earlier, use the mousedown of the tab control itself, not the tabpage.

Private Sub TabControl1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TabControl1.MouseDown
        If e.Button = Windows.Forms.MouseButtons.Right Then
            ContextMenuStrip1.Show(TabControl1, e.X, e.Y)
        End If
    End Sub

the tabcontrol itself has its own full set of events, just like each tab page has a set of events. the mousedown of the tabcontrol only fires when the mouse is clicked on one of the tabs.

[Tool]

Sorry, misunderstood your first post. That is, indeed, what I was looking for. Thank you again for your help, much appreciated.

[Simply]

g.DrawString(_TabPage.Text, _TabFont, _TextBrush, _TabBounds, New StringFormat(_StringFlags))

(141): Overload resolution failed because no accessible 'DrawString' can be called with these arguments:
'Public Sub DrawString(s As String, font As System.Drawing.Font, brush As System.Drawing.Brush, layoutRectangle As System.Drawing.RectangleF, format As System.Drawing.StringFormat)': Value of type 'System.Drawing.Rectangle' cannot be converted to 'System.Drawing.RectangleF'.
'Public Sub DrawString(s As String, font As System.Drawing.Font, brush As System.Drawing.Brush, point As System.Drawing.PointF, format As System.Drawing.StringFormat)': Value of type 'System.Drawing.Rectangle' cannot be converted to 'System.Drawing.PointF'.
'Public Sub DrawString(s As String, font As System.Drawing.Font, brush As System.Drawing.Brush, x As Single, y As Single)': Value of type 'System.Drawing.Rectangle' cannot be converted to 'Single'.
'Public Sub DrawString(s As String, font As System.Drawing.Font, brush As System.Drawing.Brush, x As Single, y As Single)': Value of type 'System.Drawing.StringFormat' cannot be converted to 'Single'.


using vb2003 why am I getting this error? Used the code from above post.

[kleinma]

just a guess, but maybe you are trying to pass in a type of "rectangle" when it wants a type of "rectangleF"

the difference between the 2 is that rectangleF uses singles and rectangle uses integer. That means a rectangleF can have a side that is 2.5 and not just 2 or 3

if _TabBounds is indeed a rectangle, you can use

RectangleF.op_Implicit(_TabBounds)

to convert a rectangle to rectangleF

[Simply]

Thanks Kleinma

got it with

Dim _TabBounds As RectangleF = RectangleF.op_Implicit(TabControl1.GetTabRect(pageNum))