From dfded1e97cb97e4f95bdfff57998a5b091393640 Mon Sep 17 00:00:00 2001
From: Waterdish <waterdish101@gmail.com>
Date: Thu, 19 Oct 2023 16:41:50 -0700
Subject: [PATCH] Allow Android text input

---
 src/CMakeLists.txt               |  5 +++++
 src/port/android/AndroidImpl.cpp | 27 +++++++++++++++++++++++++++
 src/port/android/AndroidImpl.h   | 14 ++++++++++++++
 src/window/gui/Gui.cpp           |  7 +++++++
 4 files changed, 53 insertions(+)
 create mode 100644 src/port/android/AndroidImpl.cpp
 create mode 100644 src/port/android/AndroidImpl.h

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 46ad61df6..3d4be97da 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -223,6 +223,11 @@ elseif (CMAKE_SYSTEM_NAME STREQUAL "NintendoSwitch")
         ${CMAKE_CURRENT_SOURCE_DIR}/port/switch/SwitchImpl.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/port/switch/SwitchPerformanceProfiles.h
     )
+elseif (CMAKE_SYSTEM_NAME STREQUAL "Android")
+    set(Source_Files__Port
+        ${CMAKE_CURRENT_SOURCE_DIR}/port/android/AndroidImpl.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/port/android/AndroidImpl.cpp
+    )
 endif()
 
 source_group("port" FILES ${Source_Files__Port})
diff --git a/src/port/android/AndroidImpl.cpp b/src/port/android/AndroidImpl.cpp
new file mode 100644
index 000000000..b9ce25e85
--- /dev/null
+++ b/src/port/android/AndroidImpl.cpp
@@ -0,0 +1,27 @@
+#ifdef __ANDROID__
+#include "AndroidImpl.h"
+#include <SDL2/SDL.h>
+#include "public/bridge/consolevariablebridge.h"
+
+#include <ImGui/imgui_internal.h>
+
+static bool isShowingVirtualKeyboard = true;
+
+void LUS::Android::ImGuiProcessEvent(bool wantsTextInput) {
+    ImGuiInputTextState* state = ImGui::GetInputTextState(ImGui::GetActiveID());
+
+    if (wantsTextInput) {
+        if (!isShowingVirtualKeyboard) {
+            state->ClearText();
+
+            isShowingVirtualKeyboard = true;
+            SDL_StartTextInput();
+        }
+    } else {
+        if (isShowingVirtualKeyboard) {
+            isShowingVirtualKeyboard = false;
+            SDL_StopTextInput();
+        }
+    }
+}
+#endif
diff --git a/src/port/android/AndroidImpl.h b/src/port/android/AndroidImpl.h
new file mode 100644
index 000000000..548469872
--- /dev/null
+++ b/src/port/android/AndroidImpl.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+#include <ImGui/imgui.h>
+
+namespace LUS {
+
+class Android {
+  public:
+    static void ImGuiProcessEvent(bool wantsTextInput);
+};
+}; // namespace LUS
diff --git a/src/window/gui/Gui.cpp b/src/window/gui/Gui.cpp
index 879a9cbb5..accb63026 100644
--- a/src/window/gui/Gui.cpp
+++ b/src/window/gui/Gui.cpp
@@ -42,6 +42,10 @@
 #include "port/switch/SwitchImpl.h"
 #endif
 
+#ifdef __ANDROID__
+#include "port/android/AndroidImpl.h"
+#endif
+
 #ifdef ENABLE_OPENGL
 #include <ImGui/backends/imgui_impl_opengl3.h>
 #include <ImGui/backends/imgui_impl_sdl2.h>
@@ -274,6 +278,9 @@ void Gui::Update(WindowEvent event) {
 
 #ifdef __SWITCH__
             LUS::Switch::ImGuiProcessEvent(mImGuiIo->WantTextInput);
+#endif
+#ifdef __ANDROID__
+            LUS::Android::ImGuiProcessEvent(mImGuiIo->WantTextInput);
 #endif
             break;
 #endif