Comment puis-je donner de la RichTextBox à plat?

Retour dans la journée, j'ai eu à résoudre ce avec un panneau où la zone de texte est un composant à l'intérieur et avait DockPadding set de 3 ou 4 pixels. Alors je dirais le style du groupe à un seul pixel.

J'ai toujours trouvé cela vraiment ennuyeux!

Est ici VB.NET code, il gonfle la zone non cliente avec -1 et remplit ensuite la zone non cliente avec caded bleu. Il peut être transformé en C# à l'aide de SharpDevelop 4.4. J'ai obtenu le code de cet article:

http://www.codeproject.com/Articles/13723/Themed-RichTextBox-A-RichTextBox-with-XP-styled-bo

Imports System.Runtime.InteropServices
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles
Imports System.Drawing
Imports System.Diagnostics
Public Class FlatRichTextBox
Inherits RichTextBox
Private BorderRect As RECT
Sub New()
If VisualStyleInformation.IsEnabledByUser Then
BorderStyle = BorderStyle.None
End If
End Sub
Protected Overrides Sub WndProc(ByRef m As Message)
Const WM_NCPAINT = &H85
Const WM_NCCALCSIZE = &H83
Const WM_THEMECHANGED = &H31A
Select Case m.Msg
Case WM_NCPAINT
WmNcpaint(m)
Case WM_NCCALCSIZE
WmNccalcsize(m)
Case WM_THEMECHANGED
UpdateStyles()
Case Else
MyBase.WndProc(m)
End Select
End Sub
Private Sub WmNccalcsize(ByRef m As Message)
MyBase.WndProc(m)
If Not VisualStyleInformation.IsEnabledByUser Then Return
Dim par As New NCCALCSIZE_PARAMS()
Dim windowRect As RECT
If m.WParam <> IntPtr.Zero Then
par = CType(Marshal.PtrToStructure(m.LParam, GetType(NCCALCSIZE_PARAMS)), NCCALCSIZE_PARAMS)
windowRect = par.rgrc0
End If
Dim clientRect = windowRect
clientRect.Left += 1
clientRect.Top += 1
clientRect.Right -= 1
clientRect.Bottom -= 1
BorderRect = New RECT(clientRect.Left - windowRect.Left,
clientRect.Top - windowRect.Top,
windowRect.Right - clientRect.Right,
windowRect.Bottom - clientRect.Bottom)
If m.WParam = IntPtr.Zero Then
Marshal.StructureToPtr(clientRect, m.LParam, False)
Else
par.rgrc0 = clientRect
Marshal.StructureToPtr(par, m.LParam, False)
End If
Const WVR_HREDRAW = &H100
Const WVR_VREDRAW = &H200
Const WVR_REDRAW = (WVR_HREDRAW Or WVR_VREDRAW)
m.Result = New IntPtr(WVR_REDRAW)
End Sub
Private Sub WmNcpaint(ByRef m As Message)
MyBase.WndProc(m)
If Not VisualStyleInformation.IsEnabledByUser Then Return
Dim r As RECT
GetWindowRect(Handle, r)
r.Right -= r.Left
r.Bottom -= r.Top
r.Top = 0
r.Left = 0
r.Left += BorderRect.Left
r.Top += BorderRect.Top
r.Right -= BorderRect.Right
r.Bottom -= BorderRect.Bottom
Dim hDC = GetWindowDC(Handle)
ExcludeClipRect(hDC, r.Left, r.Top, r.Right, r.Bottom)
Using g = Graphics.FromHdc(hDC)
g.Clear(Color.CadetBlue)
End Using
ReleaseDC(Handle, hDC)
m.Result = IntPtr.Zero
End Sub
<DllImport("user32.dll")>
Public Shared Function GetWindowRect(hWnd As IntPtr, ByRef lpRect As RECT) As Boolean
End Function
<DllImport("user32.dll")>
Public Shared Function GetWindowDC(hWnd As IntPtr) As IntPtr
End Function
<DllImport("user32.dll")>
Public Shared Function ReleaseDC(hWnd As IntPtr, hDC As IntPtr) As Integer
End Function
<DllImport("gdi32.dll")>
Public Shared Function ExcludeClipRect(hdc As IntPtr, nLeftRect As Integer, nTopRect As Integer, nRightRect As Integer, nBottomRect As Integer) As Integer
End Function
<StructLayout(LayoutKind.Sequential)>
Public Structure NCCALCSIZE_PARAMS
Public rgrc0, rgrc1, rgrc2 As RECT
Public lppos As IntPtr
End Structure
<StructLayout(LayoutKind.Sequential)>
Public Structure RECT
Public Left As Integer
Public Top As Integer
Public Right As Integer
Public Bottom As Integer
Public Sub New(left As Integer, top As Integer, right As Integer, bottom As Integer)
Me.Left = left
Me.Top = top
Me.Right = right
Me.Bottom = bottom
End Sub
End Structure
End Class