From 212e808b9d2e8e7249a997a0ea20029b26de146b Mon Sep 17 00:00:00 2001
From: user7182 <96945402+user7182@users.noreply.github.com>
Date: Tue, 5 Apr 2022 08:19:17 -0400
Subject: [PATCH] user_io: Keyboard emulation mode key combo added. (#578)

A key combo, Meta (Win) + Scroll Lock was added
to allow cores using PS/2 to access the Scroll
Lock.

Num Lock (EMU_SWITCH_2) was previously excluded,
this has been re-enabled when using the Meta key
modifier.

Meta+Scroll Lock previously took a screenshot.
This is no longer possible, when that key combo
is used for keyboard emuation mode. A screenshot
must be taken with either:
  Meta+Print Screen or Alt+Scroll Lock.
---
 user_io.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/user_io.cpp b/user_io.cpp
index 81499bb..af940a7 100644
--- a/user_io.cpp
+++ b/user_io.cpp
@@ -3547,7 +3547,10 @@ void user_io_kbd(uint16_t key, int press)
 	if(is_menu()) spi_uio_cmd(UIO_KEYBOARD); //ping the Menu core to wakeup
 
 	// Win+PrnScr or Alt/Win+ScrLk - screen shot
-	if ((key == KEY_SYSRQ && (get_key_mod() & (RGUI | LGUI))) || (key == KEY_SCROLLLOCK && (get_key_mod() & (LALT | RALT | RGUI | LGUI))))
+	bool key_WinPrnScr = (key == KEY_SYSRQ && (get_key_mod() & (RGUI | LGUI)));
+	// Excluding scroll lock for PS/2 so Win+ScrLk can be used to change the emu mode.
+	bool key_AltWinScrLk = (key == KEY_SCROLLLOCK && (get_key_mod() & (LALT | RALT | RGUI | LGUI))) && !use_ps2ctl;
+	if (key_WinPrnScr || key_AltWinScrLk)
 	{
 		int shift = (get_key_mod() & LSHIFT);
 		if (press == 1)
@@ -3616,7 +3619,14 @@ void user_io_kbd(uint16_t key, int press)
 				}
 				else
 				{
-					if (((code & EMU_SWITCH_1) || ((code & EMU_SWITCH_2) && !use_ps2ctl && !is_archie())) && !is_menu())
+					// When ps2ctl is set then the RGUI or LGUI key must be held in addition
+					// to the EMU_SWITCH_1 or EMU_SWITCH_2. This allows for cores such as AO486
+					// to pass through the Scroll Lock and Num Lock keys.
+					bool ps2ctl_modifier = (get_key_mod() & (RGUI | LGUI)) || !use_ps2ctl;
+					bool key_EMU_SWITCH_1 = (code & EMU_SWITCH_1) && ps2ctl_modifier;
+					bool key_EMU_SWITCH_2 = (code & EMU_SWITCH_2) && ps2ctl_modifier && !is_archie();
+
+					if (( key_EMU_SWITCH_1 || key_EMU_SWITCH_2 ) && !is_menu())
 					{
 						if (press == 1)
 						{