Method GetNonClientArea

source/script_gui.cpp:5166–5187

void GuiType::GetNonClientArea(LONG &aWidth, LONG &aHeight)
// Added for v1.0.44.13.
// Yields only the *extra* width/height added by the windows non-client area.
// If the window hasn't been shown for the first time, the caller wants zeros.
// The reason for making the script specify size of client area rather than entire window is that it
// seems far more useful.  For example, a script might know exactly how much minimum height its
// controls require in the client area, but would find it inconvenient to have to take into account
// the height of the title bar and menu bar (which vary depending on theme and other settings).
{
	if (mGuiShowHasNeverBeenDone) // In this case, the script might not yet have added the menu bar and other styles that affect the size of the non-client area.  So caller wants to do these calculations later.
	{
		aWidth = 0;
		aHeight = 0;
		return;
	}
	// Otherwise, mGuiShowHasNeverBeenDone==false, which should mean that mHwnd!=NULL.
	RECT rect, client_rect;
	GetWindowRect(mHwnd, &rect);
	GetClientRect(mHwnd, &client_rect); // Client rect's left & top are always zero.
	aWidth = (rect.right - rect.left) - client_rect.right;
	aHeight = (rect.bottom - rect.top) - client_rect.bottom;
}