[LINUX,WINDOWS] Key/Joy background input.

- Joystick background input.

Set as enabled by default.

- Linux: `X11` and `Wayland` done.

1. `Wayland` does not allow to listen for keypresses for security reasons.

Discussion here: https://github.com/albertlauncher/albert/issues/309

2. For `X11` we can use `XQueryKeymap` to check keyboard state.

- Windows: done.

We use `GetAsyncKeyState` most significant bit to check if the key
is being pressed.

src/common/ConfigManager.cpp

@@ -260,6 +260,8 @@ uint32_t throttle = 100;
 uint32_t speedup_throttle = 100;
 uint32_t speedup_frame_skip = 9;
 bool speedup_throttle_frame_skip = false;
+bool allowKeyboardBackgroundInput = false;
+bool allowJoystickBackgroundInput = true;
 
 const char* preparedCheatCodes[MAX_CHEATS];
 
@@ -477,6 +479,8 @@ void ValidateConfig()
 void LoadConfig()
 {
 	agbPrint = ReadPrefHex("agbPrint");
+	allowKeyboardBackgroundInput = ReadPref("allowKeyboardBackgroundInput", false);
+	allowJoystickBackgroundInput = ReadPref("allowJoystickBackgroundInput", true);
 	autoFireMaxCount = fromDec(ReadPrefString("autoFireMaxCount"));
 	autoFrameSkip = ReadPref("autoFrameSkip", 0);
 	autoLoadMostRecent = ReadPref("autoLoadMostRecent", 0);

src/common/ConfigManager.h

@@ -149,6 +149,8 @@ extern uint32_t throttle;
 extern uint32_t speedup_throttle;
 extern uint32_t speedup_frame_skip;
 extern bool speedup_throttle_frame_skip;
+extern bool allowKeyboardBackgroundInput;
+extern bool allowJoystickBackgroundInput;
 
 extern int preparedCheats;
 extern const char *preparedCheatCodes[MAX_CHEATS];

src/wx/CMakeLists.txt

@@ -718,6 +718,7 @@ add_custom_command(
 set(
     SRC_WX
     wxvbam.cpp
+    background-input.cpp
     guiinit.cpp
     viewers.cpp
     gfxviewers.cpp
@@ -751,6 +752,7 @@ endif()
 set(
     HDR_WX
     wxvbam.h
+    background-input.h
     wxlogdebug.h
     drawing.h
     filters.h

src/wx/background-input.h

@@ -0,0 +1,23 @@
+#ifndef BACKGROUND_INPUT_H
+#define BACKGROUND_INPUT_H
+
+#include <wx/event.h>
+#include <wx/log.h>
+#include <wx/thread.h>
+#include <wx/utils.h>
+#include <wx/window.h>
+
+#include <unordered_map>
+
+#if defined(__WXMSW__)
+extern std::unordered_map<int, wxKeyCode> gs_specialKeys;
+#elif defined(__WXMAC__)
+#else // defined(__WXGTK__)
+extern std::unordered_map<unsigned, int> x11KeySym;
+#endif
+
+void enableKeyboardBackgroundInput(wxEvtHandler* handler);
+
+void disableKeyboardBackgroundInput();
+
+#endif // BACKGROUND_INPUT_H

src/wx/cmdevents.cpp

@@ -1565,6 +1565,36 @@ EVT_HANDLER(JoypadAutoholdStart, "Autohold Start (toggle)")
     GetMenuOptionInt(keyName, autohold, keym);
 }
 
+#include "background-input.h"
+
+EVT_HANDLER(AllowKeyboardBackgroundInput, "Allow keyboard background input (toggle)")
+{
+    bool menuPress;
+    GetMenuOptionBool("AllowKeyboardBackgroundInput", menuPress);
+    toggleBooleanVar(&menuPress, &allowKeyboardBackgroundInput);
+    SetMenuOption("AllowKeyboardBackgroundInput", allowKeyboardBackgroundInput ? 1 : 0);
+
+    disableKeyboardBackgroundInput();
+
+    if (allowKeyboardBackgroundInput) {
+        if (panel && panel->panel) {
+            enableKeyboardBackgroundInput(panel->panel->GetWindow());
+        }
+    }
+
+    update_opts();
+}
+
+EVT_HANDLER(AllowJoystickBackgroundInput, "Allow joystick background input (toggle)")
+{
+    bool menuPress;
+    GetMenuOptionBool("AllowJoystickBackgroundInput", menuPress);
+    toggleBooleanVar(&menuPress, &allowJoystickBackgroundInput);
+    SetMenuOption("AllowJoystickBackgroundInput", allowJoystickBackgroundInput ? 1 : 0);
+
+    update_opts();
+}
+
 EVT_HANDLER_MASK(LoadGameRecent, "Load most recent save", CMDEN_SAVST)
 {
     panel->LoadState();
@@ -2611,7 +2641,7 @@ EVT_HANDLER_MASK(DisplayConfigure, "Display options...", CMDEN_NREC_ANY)
 
     if (panel->panel) {
         panel->panel->Destroy();
-        panel->panel = NULL;
+        panel->panel = nullptr;
     }
 
     update_opts();
@@ -2629,7 +2659,7 @@ EVT_HANDLER_MASK(ChangeFilter, "Change Pixel Filter", CMDEN_NREC_ANY)
 
     if (panel->panel) {
         panel->panel->Destroy();
-        panel->panel = NULL;
+        panel->panel = nullptr;
     }
 
     wxString msg;
@@ -2644,7 +2674,7 @@ EVT_HANDLER_MASK(ChangeIFB, "Change Interframe Blending", CMDEN_NREC_ANY)
 
     if (panel->panel) {
         panel->panel->Destroy();
-        panel->panel = NULL;
+        panel->panel = nullptr;
     }
 
     wxString msg;

src/wx/guiinit.cpp

@@ -26,6 +26,10 @@
 #include "../common/ConfigManager.h"
 #include "../gba/CheatSearch.h"
 
+#if defined(__WXGTK__)
+#include "wayland.h"
+#endif
+
 // The program icon, in case it's missing from .xrc (MSW gets it from .rc file)
 #if !defined(__WXMSW__) && !defined(__WXPM__)
 // ImageMagick makes the name wxvbam, but wx expects wxvbam_xpm
@@ -2834,6 +2838,22 @@ bool MainFrame::BindControls()
                 continue;
             }
 
+#endif
+#if defined(__WXMAC__) || defined(__WXGTK__)
+
+            if (cmdtab[i].cmd_id == XRCID("AllowKeyboardBackgroundInput")
+#if defined(__WXGTK__)
+                && IsItWayland()
+#endif
+               ) {
+                if (mi)
+                    mi->GetMenu()->Remove(mi);
+
+                cmdtab[i].cmd_id = XRCID("NOOP");
+                cmdtab[i].mi = NULL;
+                continue;
+            }
+
 #endif
 #ifdef NO_LINK
 

src/wx/opts.cpp

@@ -308,6 +308,8 @@ opt_desc opts[] = {
     INTOPT("geometry/windowY", "Y", wxTRANSLATE("Window axis Y position at startup"), windowPositionY, -1, 99999),
 
     /// UI
+    BOOLOPT("ui/allowKeyboardBackgroundInput", "AllowKeyboardBackgroundInput", wxTRANSLATE("Capture key events while on background"), allowKeyboardBackgroundInput),
+    BOOLOPT("ui/allowJoystickBackgroundInput", "AllowJoystickBackgroundInput", wxTRANSLATE("Capture joy events while on background"), allowJoystickBackgroundInput),
     BOOLOPT("ui/hideMenuBar", "", wxTRANSLATE("Hide menu bar when mouse is inactive"), gopts.hide_menu_bar),
 
     /// Sound

src/wx/panel.cpp

@@ -27,6 +27,7 @@
 #include "wxvbam.h"
 #include "wxutil.h"
 #include "wayland.h"
+#include "background-input.h"
 
 #ifdef __WXMSW__
 #include <windows.h>
@@ -328,7 +329,6 @@ void GameArea::LoadGame(const wxString& name)
     emulating = true;
     was_paused = true;
     MainFrame* mf = wxGetApp().frame;
-    mf->StopJoyPollTimer();
     mf->SetJoystick();
     mf->cmd_enable &= ~(CMDEN_GB | CMDEN_GBA);
     mf->cmd_enable |= ONLOAD_CMDEN;
@@ -557,15 +557,17 @@ void GameArea::UnloadGame(bool destruct)
     emusys = NULL;
     soundShutdown();
 
+    disableKeyboardBackgroundInput();
+
     if (destruct)
         return;
 
     // in destructor, panel should be auto-deleted by wx since all panels
     // are derived from a window attached as child to GameArea
-    if (panel)
+    if (panel) {
         panel->Destroy();
-
-    panel = NULL;
+        panel = nullptr;
+    }
 
     // close any game-related viewer windows
     // in destructor, viewer windows are in process of being deleted anyway
@@ -579,7 +581,6 @@ void GameArea::UnloadGame(bool destruct)
     mf->enable_menus();
     mf->SetJoystick();
     mf->ResetCheatSearch();
-    mf->StartJoyPollTimer();
 
     if (rewind_mem)
         num_rewind_states = 0;
@@ -702,10 +703,10 @@ void GameArea::AddBorder()
     wxGetApp().frame->Fit();
     GetSizer()->Detach(panel->GetWindow());
 
-    if (panel)
+    if (panel) {
         panel->Destroy();
-
-    panel = NULL;
+        panel = nullptr;
+    }
 }
 
 void GameArea::DelBorder()
@@ -721,10 +722,10 @@ void GameArea::DelBorder()
     wxGetApp().frame->Fit();
     GetSizer()->Detach(panel->GetWindow());
 
-    if (panel)
+    if (panel) {
         panel->Destroy();
-
-    panel = NULL;
+        panel = nullptr;
+    }
 }
 
 void GameArea::AdjustMinSize()
@@ -802,7 +803,7 @@ void GameArea::ShowFullScreen(bool full)
     // delete panel to be recreated immediately after resize
     if (panel) {
         panel->Destroy();
-        panel = NULL;
+        panel = nullptr;
     }
 
     // Windows does not restore old window size/pos
@@ -1067,6 +1068,10 @@ void GameArea::OnIdle(wxIdleEvent& event)
         w->SetBackgroundStyle(wxBG_STYLE_CUSTOM);
         w->SetSize(wxSize(basic_width, basic_height));
 
+        // Allow input while on background
+        if (allowKeyboardBackgroundInput)
+            enableKeyboardBackgroundInput(w);
+
         if (maxScale)
             w->SetMaxSize(wxSize(basic_width * maxScale,
                 basic_height * maxScale));
@@ -2060,6 +2065,8 @@ DrawingPanelBase::~DrawingPanelBase()
 
         delete[] threads;
     }
+
+    disableKeyboardBackgroundInput();
 }
 
 BasicDrawingPanel::BasicDrawingPanel(wxWindow* parent, int _width, int _height)

src/wx/widgets/sdljoy.cpp

@@ -45,8 +45,10 @@ void wxSDLJoy::CreateAndSendEvent(wxEvtHandler* handler, unsigned short joy, uns
 {
     if (!handler) {
         GameArea *panel = wxGetApp().frame->GetPanel();
-        if (panel) handler = panel->GetEventHandler();
-        else return;
+        if (panel && allowJoystickBackgroundInput)
+            handler = panel->GetEventHandler();
+        else
+            return;
     }
 
     wxSDLJoyEvent *ev = new wxSDLJoyEvent(wxEVT_SDLJOY);

src/wx/xrc/MainMenu.xrc

@@ -426,6 +426,14 @@
         <object class="wxMenuItem" name="JoypadConfigure">
           <label>_Configure ...</label>
         </object>
+        <object class="wxMenuItem" name="AllowKeyboardBackgroundInput">
+          <label>Allow _keyboard background input</label>
+          <checkable>1</checkable>
+        </object>
+        <object class="wxMenuItem" name="AllowJoystickBackgroundInput">
+          <label>Allow _joystick background input</label>
+          <checkable>1</checkable>
+        </object>
         <object class="separator"/>
         <object class="wxMenu">
           <label>_Autofire</label>