bool OnParentWmPaint(ref Message m, BaseWndProc baseProc)
{
IntPtr hwnd = m.HWnd;
var clientRect = new NativeMethods.RECT();
UnsafeNativeMethods.GetClientRect(hwnd, ref clientRect);
ActionOnFrameRect(clientRect.ToRectangle(), rect => UnsafeNativeMethods.ValidateRect(hwnd, ref rect));
return(false);
}
bool OnParentWmNcCalcSize(ref Message m, BaseWndProc baseProc)
{
if (m.WParam != IntPtr.Zero)
{
m.Result = IntPtr.Zero;
ExtendFrameIntoClientArea(m.HWnd);
return(true);
}
return(false);
}
bool OnParentWmEraseBackground(ref Message m, BaseWndProc baseProc)
{
baseProc(ref m);
using (var g = Graphics.FromHdc(m.WParam))
{
DrawParentFrame(g, m.HWnd);
}
return(true);
}
bool OnParentWmNcHitTest(ref Message m, BaseWndProc baseProc)
{
int hitTestCode = GetHitTest(m);
if (hitTestCode != NativeMethods.HTNOWHERE)
{
m.Result = (IntPtr)hitTestCode;
return(true);
}
return(false);
}
bool OnParentWmNcRButtonUp(ref Message m, BaseWndProc baseProc)
{
switch (m.WParam.ToInt32())
{
case NativeMethods.HTCAPTION:
case NativeMethods.HTSYSMENU:
// HACK: display a system menu
UnsafeNativeMethods.PostMessage(m.HWnd, 0x313, IntPtr.Zero, m.LParam);
return(true);
}
return(false);
}
bool OnParentWmSize(ref Message m, BaseWndProc baseProc)
{
var oldRect = this.ParentForm.ClientRectangle;
baseProc(ref m);
IntPtr hwnd = m.HWnd;
var newRect = new NativeMethods.RECT();
UnsafeNativeMethods.GetClientRect(hwnd, ref newRect);
ActionOnFrameRect(oldRect, rect => UnsafeNativeMethods.InvalidateRect(hwnd, ref rect, 1));
ActionOnFrameRect(newRect.ToRectangle(), rect => UnsafeNativeMethods.InvalidateRect(hwnd, ref rect, 1));
return(true);
}
bool OnParentWmWindowPosChanged(ref Message m, BaseWndProc baseProc)
{
if (this.ParentForm == null || this.ParentForm.IsHandleCreated == false)
{
return(false);
}
// recover the correct size of the parent window
// after the Form's WM_WINDOWPOSCHANGED handler messes it up.
// 1a. minimise FormWindowState.Normal, SW_SHOWMINIMIZED
// 1b. maximise FormWindowState.Maximized, SW_SHOWMAXIMIZED
// 2. restore (ignore) FormWindowState.Minimized, SW_SHOWMINIMIZED
// 3. reentrant (<<here) FormWindowState.Normal, SW_SHOWNORMAL
var parentForm = this.ParentForm;
var wp = new NativeMethods.WINDOWPLACEMENT();
wp.length = Marshal.SizeOf(typeof(NativeMethods.WINDOWPLACEMENT));
UnsafeNativeMethods.GetWindowPlacement(this.ParentForm.Handle, ref wp);
var saveSize = (wp.showCmd == NativeMethods.SW_SHOWMINIMIZED) ||
(wp.showCmd == NativeMethods.SW_SHOWMAXIMIZED);
if (saveSize)
{
this.restoredWindowSize = wp.rcNormalPosition.ToRectangle().Size;
this.restoredSizeSaved = true;
}
var stage2 = parentForm.WindowState == FormWindowState.Minimized && wp.showCmd == NativeMethods.SW_SHOWMINIMIZED;
var stage3 = parentForm.WindowState == FormWindowState.Normal && wp.showCmd == NativeMethods.SW_SHOWNORMAL;
baseProc(ref m);
if (this.restoredSizeSaved && stage3)
{
this.restoredSizeSaved = false;
//parentForm.Refresh();
parentForm.Size = this.restoredWindowSize;
}
else if (stage2)
{
}
return(true);
}
bool OnParentWmDwmCompositionChanged(ref Message m, BaseWndProc baseProc)
{
ExtendFrameIntoClientArea(m.HWnd);
return(false);
}
bool OnParentWmActivate(ref Message m, BaseWndProc baseProc)
{
UpdateForeColour(m.WParam.ToInt32() != NativeMethods.WA_INACTIVE);
this.Refresh();
return(false);
}
