public static int SendMessage(Control destinationObject, int messageId, int generic16BitsParameter, int generic32BitsParameter)
{
if (destinationObject == null)
{
throw new NolmeArgumentNullException();
}
int iResult = User32ApiNativeMethods.SendMessage(new HandleRef(destinationObject, destinationObject.Handle), messageId, generic16BitsParameter, generic32BitsParameter);
return(iResult);
}
/// <summary>
/// Resumes drawing and event handling.
/// </summary>
/// <remarks>
/// This method should be called every time a call is made
/// made to BeginUpdate. It resets the event mask to it's
/// original value and enables redrawing of the control.
/// </remarks>
public static void EndUpdate(Control sourceRichEdit)
{
if (sourceRichEdit == null)
{
throw new NolmeArgumentNullException();
}
// Deal with nested calls
--updating;
if (updating > 0)
{
return;
}
// Allow the control to redraw itself
User32ApiNativeMethods.SendMessage(new HandleRef(sourceRichEdit, sourceRichEdit.Handle), WM_SETREDRAW, 1, 0);
// Allow the control to raise event messages
User32ApiNativeMethods.SendMessage(new HandleRef(sourceRichEdit, sourceRichEdit.Handle), EM_SETEVENTMASK, 0, oldEventMask);
}
/// <summary>
/// Maintains performance while updating.
/// </summary>
/// <remarks>
/// <para>
/// It is recommended to call this method before doing
/// any major updates that you do not wish the user to
/// see. Remember to call EndUpdate when you are finished
/// with the update. Nested calls are supported.
/// </para>
/// <para>
/// Calling this method will prevent redrawing. It will
/// also setup the event mask of the underlying richedit
/// control so that no events are sent.
/// </para>
/// </remarks>
public static void BeginUpdate(Control sourceRichEdit)
{
if (sourceRichEdit == null)
{
throw new NolmeArgumentNullException();
}
// Deal with nested calls
++updating;
if (updating > 1)
{
return;
}
// Prevent the control from raising any events
oldEventMask = User32ApiNativeMethods.SendMessage(new HandleRef(sourceRichEdit, sourceRichEdit.Handle), EM_SETEVENTMASK, 0, 0);
// Prevent the control from redrawing itself
User32ApiNativeMethods.SendMessage(new HandleRef(sourceRichEdit, sourceRichEdit.Handle), WM_SETREDRAW, 0, 0);
}
public static int SendMessage(IntPtr windowHandle, int messageId, int generic16BitsParameter, object parameter)
{
int iResult = User32ApiNativeMethods.SendMessage((int)windowHandle, messageId, generic16BitsParameter, (int)parameter);
return(iResult);
}
public static int SendMessage(HandleRef windowHandle, int messageId, int generic16BitsParameter, int generic32BitsParameter)
{
int iResult = User32ApiNativeMethods.SendMessage(windowHandle, messageId, generic16BitsParameter, generic32BitsParameter);
return(iResult);
}