IUP - Minimizing and restoring programmatically

["Mark Meijer" <meijer78@...>]

Thanks again regarding my previous questions. Obviously I got to it 
yesterday to revisit the tray functionality of the app in question, and 
bumped into a few more problems. The app's main dialog should minimize to 
the system tray, but I'm not sure if I'm going about it the right way. 
Particularly because I can't seem to bring the dialog back up 
programmatically (i.e. using the tray popup menu).
Minimizing appears to work fine, either using the regular minimize button on 
the dialog, or using the designated menu item from the tray popup menu. When 
using the tray menu, its action callback minimizes the dialog with 
dlg.placement = "MINIMIZE" followed by dlg:show(). The show_cb of the dialog 
gets called with the mode argument set to 2, as expected when it gets 
minimized, and there it does self.hidetaskbar = "YES" successfully, and the 
tray menu item title is changed from "Hide" to "Show" (I did consider truely 
hiding the dialog by means of dlg:hide() but that leaves no other dialogs 
open, and thus causes IUP to quit the mainloop irrevocably).
When I try to bring the dialog back up using the tray menu (as the taskbar 
button is gone), well, it doesn't come back up. The action callback of the 
tray menu item tries to restore the dialog with dlg.placement = "NORMAL" and 
dlg:show(). When this happens, the button reappears back into the taskbar, 
but the dialog stays minimized. The show_cb gets called with mode == 0, as 
always, which is ignored by my code there. But it does not get called with 
mode == 1, probably because the dialog is not actually restored. So, oddly, 
it turns out that it's not (directly) my code that un-hides the taskbar 
button.
The show_cb then is where my code would set self.hidetaskbar = "NO" and 
change the tray menu item from "Show" back to "Hide", if it would ever get 
there (e.g. when it gets mode == 1). But it does not, indeed the menu item 
title remains unchanged. It's not clear to me why the taskbar button 
magically reappears and the dialog does not. Note that once the taskbar 
button reappears, clicking on it will restore the dialog (and calls show_cb 
with mode == 1) as expected. I just can't get it to restore 
programmatically.
If I try dlg.placement = "MAXIMIZED" (instead of "NORMAL") in the tray menu 
item's action callback, then the dialog gets maximized as expected. And then 
the show_cb gets called with mode == 1. So I tried maximizing it first just 
to have the dialog come back up, and then trying to restore it to its 
original size in the same way as before, but it stays maximized. In any 
event, setting dlg.placement = "NORMAL" does not seem to have any effect at 
all. I've also tried refresh, show and showXY in all kinds of combinations, 
but to no avail.
Furthermore, once I've used that tray menu to try and get the dialog back 
up, the iup.MainLoop doesn't return anymore when the dialog is closed 
(although the dialog itself closes and its close_cb gets called). This means 
the app doesn't shut down (which I only noticed because the I/O console 
stays open) Another (probably unrelated) problem is that the other item in 
my little tray menu, which looks like this... iup.item {title = "Exit", 
action = function() return iup.CLOSE; end}; ...doesn't seem to have any 
effect. The callback is called, but nothing happens when iup.CLOSE is 
returned.
By the way I didn't move to IUP 2.4 final yet, the current build of my app 
is statically linked to the prebuilt VC6 libs of IUP version 2.4b, and to 
lua 5.0.2.
I've reduced my code to the following little test proggie for purposes of 
reproducing the problems. All it needs is lua and IUP (for example the 
prebuilt iuplua5.exe binary download).

-----8<----------8<--[snip]--8<----------8<----------
local MainDialog = nil;


local function Hide(dlg)
	if dlg then
		dlg.placement = "MINIMIZED";
		dlg:show();
	end
end


local function Show(dlg)
	if dlg then
		dlg.placement = "NORMAL";
		dlg:show();
	end
end


local TrayMenuToggle = iup.item {
	title = "Hide";
	action = function(self)
		local text = self.title;
		if text == "Hide" then Hide(MainDialog); else Show(MainDialog); end
	end;
};


local TrayMenu = iup.menu {
	TrayMenuToggle;
	iup.item {title = "Exit", action = function() return iup.CLOSE; end};
};


MainDialog = iup.dialog {
	title       = "MyApp";
	icon        = "MyIcon";
	maxbox      = "NO";
	resize      = "NO";
	tray        = "YES";
	traytip     = "Hello World";
	trayimage   = "MyIcon";

	iup.label{title = "          Hello World          "};

	trayclick_cb = function()
		TrayMenu:popup(iup.MOUSEPOS, iup.MOUSEPOS);
	end;

	show_cb = function(self, mode)
		if 1 == mode then     -- Restore
			TrayMenuToggle.title = "Hide";
			self.hidetaskbar = "NO";
		elseif 2 == mode then -- Minimize
			TrayMenuToggle.title = "Show";
			self.hidetaskbar = "YES";
		else                  -- Show dialog (mode == 0)
			--iup.Message("Just checking...", tostring(mode));
		end
	end;

	close_cb = function(self)
		self.tray = "NO";
		return iup.CLOSE;
	end;
};


MainDialog:show();
iup.MainLoop();
----->8---------->8--[snip]-->8---------->8----------


Does anyone have any clues what's going wrong?