From 529f8625f58c23ce6118d4ae0dc6a5310f6d24a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mon=20ou=C3=AFe?= <mon.ouie@gmail.com>
Date: Thu, 30 Nov 2023 23:12:39 +0100
Subject: Allow VR keyboard overlay to type into the tracked window
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This adds a new dependency — xdo — but I do not feel too bad about requiring it
at compile time, since the readme already recommends using xdotool to select
a window from the command line.
---
 src/main.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/main.cpp b/src/main.cpp
index 1929193..2559785 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -49,6 +49,8 @@
 #include <X11/Xlib.h>
 #include <X11/extensions/Xfixes.h>
 
+#include <xdo.h>
+
 #include <stdio.h>
 #include <string>
 #include <cstdlib>
@@ -416,6 +418,7 @@ private: // X compositor
         VideoBuffers *overlay_buffers = nullptr;
         GLuint m_unOverlayProgramID = 0;
         const char *overlay_key = "vr-video-player";
+        xdo_t *overlay_xdo = nullptr;
 };
 
 
@@ -1201,6 +1204,8 @@ bool CMainApplication::BInitOverlay()
 
         vr::VROverlay()->SetOverlayFromFile( thumbnail_handle, "frog.png");
 
+        overlay_xdo = xdo_new_with_opened_display(x_display, nullptr, 0);
+
 	return true;
 }
 
@@ -1280,6 +1285,9 @@ void CMainApplication::Shutdown()
 
 	SDL_Quit();
 
+        if (overlay_xdo)
+                xdo_free(overlay_xdo);
+
 	if (x_display)
 		XCloseDisplay(x_display);
 }
@@ -1616,6 +1624,16 @@ void CMainApplication::ProcessVREvent( const vr::VREvent_t & event )
                         bQuitSignal = true;
                 }
                 break;
+
+        case vr::VREvent_KeyboardCharInput:
+                if (overlay_xdo && src_window_id != None) {
+                        char text[sizeof(event.data.keyboard.cNewInput) + 1] = {0};
+                        memcpy(text, event.data.keyboard.cNewInput,
+                               sizeof(event.data.keyboard.cNewInput));
+                        xdo_enter_text_window(overlay_xdo, src_window_id, text,
+                                              12 * 1000);
+                }
+                break;
 	}
 }
 
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