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1. #Ctrl paint rendering how to#
2. #Ctrl paint rendering update#
3. #Ctrl paint rendering code#
4. #Ctrl paint rendering windows#

#Ctrl paint rendering windows#

a Windows Form - I'm finding that my Visual Studio 2015 renders the form correctly at Design Time as well as runtime: Once you host the ParentUserControl somewhere, e.g. M圜(Me.HostedControlToBeRotated, e.Graphics) 'twist rendering mode 90 counter clockwise, and shift rendering over to right-most endĮ.Graphics.SmoothingMode = Į.Graphics.TranslateTransform(Me.Width - Me.HostedControlToBeRotated.Height, Me.Height) 'here, we will custom paint the HostedControlToBeRotated instance. Then, in the same ParentUserControl, we paint the control-to-be-manipulated from the ground up: Protected Overrides Sub OnPaint(e As PaintEventArgs) Me.Controls.Remove(Me.HostedControlToBeRotated) 'exempt this control from standard painting: SetStyle(ControlStyles.AllPaintingInWmPaint, True)

#Ctrl paint rendering code#

Then, I exempt the child control from being painted, with this code in the ParentUserControl.Load event handler: Private Sub ParentUserControl_Load(sender As Object, e As EventArgs) Handles MyBase.Load Here I'm needing a sub-set of labels to render perpendicular to the layout: Now, I hand off my child paint routine to an extension method based off this concept from Mike Gold for printing windows forms. fully taking the child's paint capabilities offline. Controls collection, and the Parent's OnPaint takes care of completely painting the child control in whatever special way. In my scenario, I use what I'll refer to as a "Parent" UserControl - and during the Load event, I simply remove the control-to-be-manipulated from the Parent's. This is even simpler, and perhaps hacky - as I can see a lot of GDI muscle on this thread, and is obviously only a good fit for certain scenarios. Public Sub ResumePaint(ByVal ctrl As )ĭim msgResumeUpdate As = (ctrl.Handle, WM_SETREDRAW, wparam, ) Public Sub SuspendPaint(ByVal ctrl As )ĭim msgSuspendUpdate As = (ctrl.Handle, WM_SETREDRAW,, )ĭim window As = (ctrl.Handle) ''' A stronger "SuspendLayout" completely holds the controls painting until ResumePaint is called Here is a combination of ceztko's and ng5000's to bring a VB extensions version that doesn't use pinvoke Imports Public Sub ResumeDrawing(ByVal Target As Control) SendMessage(Target.Handle, WM_SETREDRAW, False, IntPtr.Zero) Public Sub SuspendDrawing(ByVal Target As Control) SendMessage(Target.Handle, WM_SETREDRAW, True, IntPtr.Zero) Public Sub ResumeDrawing(ByVal Target As Control, ByVal Redraw As Boolean) Private Const WM_SETREDRAW As Integer = 11 Private Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Boolean, ByVal lParam As IntPtr) As Integer There are fuller discussions on this - google for C# and WM_SETREDRAW, e.g.Īnd to whom it may concern, this is a similar example in VB: Public Module Extensions SendMessage(parent.Handle, WM_SETREDRAW, true, 0) Public static void ResumeDrawing( Control parent ) SendMessage(parent.Handle, WM_SETREDRAW, false, 0) Public static void SuspendDrawing( Control parent ) Public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam)

#Ctrl paint rendering how to#

This is a very very simple class demonstrating how to use this message: class DrawingControl

#Ctrl paint rendering update#

This really stops controls drawing whilst you update them and can be applied, IIRC to the parent/containing panel. Net controls, custom controls and devexpress controls.Īfter a lot of googling and reflector usage, I came across the WM_SETREDRAW win32 message. At my previous job, we struggled with getting our rich UI app to paint instantly and smoothly.