Function GuiWindowProc

source/script_gui.cpp:8179–9149

LRESULT CALLBACK GuiWindowProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	// If a message pump other than our own is running -- such as that of a dialog like MsgBox -- it will
	// dispatch messages directly here.  This is detected by means of g->CalledByIsDialogMessageOrDispatch==false.
	// Such messages need to be checked here because MsgSleep hasn't seen the message and thus hasn't
	// done the check. The g->CalledByIsDialogMessageOrDispatch method relies on the fact that we never call
	// MsgSleep here for the types of messages dispatched from MsgSleep, which seems true.  Also, if
	// we do launch a monitor thread here via MsgMonitor, that means g->CalledByIsDialogMessageOrDispatch==false.
	// Therefore, any calls to MsgSleep made by the new thread can't corrupt our caller's settings of
	// g->CalledByIsDialogMessageOrDispatch because in that case, our caller isn't MsgSleep's IsDialog/Dispatch.
	// As an added precaution against the complexity of these message issues (only one of several such scenarios
	// is described above), CalledByIsDialogMessageOrDispatch is put into the g-struct rather than being
	// a normal global.  That way, a thread's calls to MsgSleep can't interfere with the value of
	// CalledByIsDialogMessageOrDispatch for any threads beneath it.  Although this may technically be
	// unnecessary, it adds maintainability.
	LRESULT msg_reply;
	if (g_MsgMonitor.Count() // Count is checked here to avoid function-call overhead.
		&& (!g->CalledByIsDialogMessageOrDispatch || g->CalledByIsDialogMessageOrDispatchMsg != iMsg) // v1.0.44.11: If called by IsDialog or Dispatch but they changed the message number, check if the script is monitoring that new number.
		&& MsgMonitor(hWnd, iMsg, wParam, lParam, NULL, msg_reply))
		return msg_reply; // MsgMonitor has returned "true", indicating that this message should be omitted from further processing.
	g->CalledByIsDialogMessageOrDispatch = false;
	// Fixed for v1.0.40.01: The above line was added to resolve a case where our caller did make the value
	// true but the message it sent us results in a recursive call to us (such as when the user resizes a
	// window by dragging its borders: that apparently starts a loop in DefDlgProc that calls this
	// function recursively).  This fixes OnMessage(0x24, "WM_GETMINMAXINFO") and probably others.
	// Known limitation: If the above launched a thread but the thread didn't cause it turn return,
	// and iMsg is something like AHK_GUI_ACTION that will be reposted via PostMessage(), the monitor
	// will be launched again when MsgSleep is called in conjunction with the repost. Given the rarity
	// and the minimal consequences of this, no extra code (such as passing a new parameter to MsgSleep)
	// is added to handle this.

	GuiType *pgui;
	GuiControlType *pcontrol;
	GuiIndexType control_index;
	bool text_color_was_changed;
	TCHAR buf[1024];

	switch (iMsg)
	{
	// case WM_CREATE: --> Do nothing extra because DefDlgProc() appears to be sufficient.

	case WM_SIZE: // Listed first for performance.
		if (   !(pgui = GuiType::FindGui(hWnd))   )
			break; // Let default proc handle it.
		pgui->mIsMinimized = wParam == SIZE_MINIMIZED; // See "case WM_SETFOCUS" for comments.
		if (pgui->mStatusBarHwnd)
			// Send the msg even if the bar is hidden because the OS typically knows not to do extra drawing work for
			// hidden controls.  In addition, when the bar is shown again, it might be the wrong size if this isn't done.
			// Known/documented limitation: In spite of being in the right z-order position, any control that
			// overlaps the status bar might sometimes get drawn on top of it.
			SendMessage(pgui->mStatusBarHwnd, WM_SIZE, wParam, lParam); // It apparently ignores wParam and lParam, but just in case send it the actuals.
		switch (wParam)
		{
		case SIZE_RESTORED: wParam = 0; break;
		case SIZE_MAXIMIZED: wParam = 1; break;
		case SIZE_MINIMIZED: wParam = -1; break;
		//default:
		// Note that SIZE_MAXSHOW/SIZE_MAXHIDE don't seem to ever be received under the conditions