Hi Lance,
Based on my understanding, you wanted to create a customized
ToolStripRender inherits from ToolStripProfessionalRenderer to customize
the text display color of each item. However, you find that when the item
is disabled, your setting in ToolStripProfessionalRenderer.OnRenderItemText
method will be ignored.
Yes, I have written a little sample application regarding your scenario and
I can reproduce this behavior.
Further research shows that after invoking your override version of
OnRenderItemText, "MyBase.OnRenderItemText(e)" in your code will call the
ToolStripRenderer.OnRenderItemText method which is implemented by .Net
Framework. Below is the full code of "ToolStripRenderer.OnRenderItemText"
method:
Protected Overridable Sub OnRenderItemText(ByVal e As
ToolStripItemTextRenderEventArgs)
If (Not Me.RendererOverride Is Nothing) Then
Me.RendererOverride.OnRenderItemText(e)
Else
Dim item1 As ToolStripItem = e.Item
Dim graphics1 As Graphics = e.Graphics
Dim color1 As Color = e.TextColor
Dim font1 As Font = e.TextFont
Dim text1 As String = e.Text
Dim rectangle1 As Rectangle = e.TextRectangle
Dim flags1 As TextFormatFlags = e.TextFormat
color1 = IIf(item1.Enabled, color1, SystemColors.GrayText)
'<<<this statement will ignore our setting
If (((e.TextDirection <ToolStripTextDirection.Horizontal)
AndAlso (rectangle1.Width 0)) AndAlso (rectangle1.Height 0)) Then
Dim size1 As Size = LayoutUtils.FlipSize(rectangle1.Size)
Using bitmap1 As Bitmap = New Bitmap(size1.Width,
size1.Height, PixelFormat.Format32bppPArgb)
Using graphics2 As Graphics =
Graphics.FromImage(bitmap1)
graphics2.TextRenderingHint =
TextRenderingHint.AntiAlias
TextRenderer.DrawText(graphics2, text1,
font1, New Rectangle(Point.Empty, size1), color1, flags1)
bitmap1.RotateFlip(IIf((e.TextDirection =
ToolStripTextDirection.Vertical90), RotateFlipType.Rotate90FlipNone,
RotateFlipType.Rotate270FlipNone))
graphics1.DrawImage(bitmap1, rectangle1)
Return
End Using
End Using
End If
TextRenderer.DrawText(graphics1, text1, font1, rectangle1,
color1, flags1)
End If
End Sub
Please see the line I marked with "<<<", this code will ignore our color
setting when item is disabled. This means .Net Winform will not use our
provided text color setting if the item is disabled, so that it can keep a
consistent appearance. This behavior is by design.
If you really want to workaround this design behavior, you should not call
the "MyBase.OnRenderItemText(e)", but simulate
"ToolStripRenderer.OnRenderItemText" code logic in your method, like this:
Public Class MyRenderer
Inherits Windows.Forms.ToolStripProfessionalRenderer
Protected Overrides Sub OnRenderItemText(ByVal e As
System.Windows.Forms.ToolStripItemTextRenderEventA rgs)
If (Not e.Item.Enabled) Then
e.TextColor = Color.Red
End If
Dim item1 As ToolStripItem = e.Item
Dim graphics1 As Graphics = e.Graphics
Dim color1 As Color = e.TextColor
Dim font1 As Font = e.TextFont
Dim text1 As String = e.Text
Dim rectangle1 As Rectangle = e.TextRectangle
Dim flags1 As TextFormatFlags = e.TextFormat
'color1 = IIf(item1.Enabled, color1, SystemColors.GrayText)
TextRenderer.DrawText(graphics1, text1, font1, rectangle1,
color1, flags1)
End Sub
End Class
Note: I did not include the logic of
ToolStripProfessionalRenderer.OnRenderItemText method logic in this code
snippet, you may consider add its code in either.
Hope this helps.
Best regards,
Jeffrey Tan
Microsoft Online Community Support
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