ImGuiManager: Add Begin/EndTextInput()

src/duckstation-qt/qthost.cpp

@@ -234,8 +234,7 @@ bool QtHost::SaveGameSettings(SettingsInterface* sif, bool delete_if_empty)
     // to read it at the same time.
     const auto lock = Host::GetSettingsLock();
 
-    if (FileSystem::FileExists(ini->GetPath().c_str()) &&
-        !FileSystem::DeleteFile(ini->GetPath().c_str(), &error))
+    if (FileSystem::FileExists(ini->GetPath().c_str()) && !FileSystem::DeleteFile(ini->GetPath().c_str(), &error))
     {
       Host::ReportErrorAsync(
         TRANSLATE_SV("QtHost", "Error"),
@@ -1647,6 +1646,25 @@ void Host::OpenHostFileSelectorAsync(std::string_view title, bool select_directo
   });
 }
 
+void Host::BeginTextInput()
+{
+  DEV_LOG("Host::BeginTextInput()");
+
+  // NOTE: Called on GPU thread.
+  QInputMethod* method = qApp->inputMethod();
+  if (method)
+    QMetaObject::invokeMethod(method, "show", Qt::QueuedConnection);
+}
+
+void Host::EndTextInput()
+{
+  DEV_LOG("Host::EndTextInput()");
+
+  QInputMethod* method = qApp->inputMethod();
+  if (method)
+    QMetaObject::invokeMethod(method, "hide", Qt::QueuedConnection);
+}
+
 bool Host::CreateAuxiliaryRenderWindow(s32 x, s32 y, u32 width, u32 height, std::string_view title,
                                        std::string_view icon_name, AuxiliaryRenderWindowUserData userdata,
                                        AuxiliaryRenderWindowHandle* handle, WindowInfo* wi, Error* error)

src/duckstation-regtest/regtest_host.cpp

@@ -370,6 +370,16 @@ void Host::ReleaseRenderWindow()
   //
 }
 
+void Host::BeginTextInput()
+{
+  //
+}
+
+void Host::EndTextInput()
+{
+  //
+}
+
 bool Host::CreateAuxiliaryRenderWindow(s32 x, s32 y, u32 width, u32 height, std::string_view title,
                                        std::string_view icon_name, AuxiliaryRenderWindowUserData userdata,
                                        AuxiliaryRenderWindowHandle* handle, WindowInfo* wi, Error* error)

src/util/imgui_manager.cpp

@@ -119,6 +119,7 @@ static Timer s_last_render_time;
 // cached copies of WantCaptureKeyboard/Mouse, used to know when to dispatch events
 static std::atomic_bool s_imgui_wants_keyboard{false};
 static std::atomic_bool s_imgui_wants_mouse{false};
+static std::atomic_bool s_imgui_wants_text{false};
 
 // mapping of host key -> imgui key
 static std::unordered_map<u32, ImGuiKey> s_imgui_key_map;
@@ -375,6 +376,16 @@ void ImGuiManager::NewFrame()
   ImGui::GetCurrentWindowRead()->Flags |= ImGuiWindowFlags_NoNavInputs;
   s_imgui_wants_keyboard.store(io.WantCaptureKeyboard, std::memory_order_relaxed);
   s_imgui_wants_mouse.store(io.WantCaptureMouse, std::memory_order_release);
+
+  const bool wants_text_input = io.WantTextInput;
+  if (s_imgui_wants_text.load(std::memory_order_relaxed) != wants_text_input)
+  {
+    s_imgui_wants_text.store(wants_text_input, std::memory_order_release);
+    if (wants_text_input)
+      Host::BeginTextInput();
+    else
+      Host::EndTextInput();
+  }
 }
 
 void ImGuiManager::SetStyle(ImGuiStyle& style, float scale)

src/util/imgui_manager.h

@@ -230,6 +230,13 @@ void RemoveKeyedOSDMessage(std::string key);
 void RemoveKeyedOSDWarning(std::string key);
 void ClearOSDMessages(bool clear_warnings);
 
+/// Called by ImGuiManager when the cursor enters a text field. The host may choose to open an on-screen
+/// keyboard for devices without a physical keyboard.
+void BeginTextInput();
+
+/// Called by ImGuiManager when the cursor leaves a text field.
+void EndTextInput();
+
 #ifndef __ANDROID__
 
 /// Auxiliary window management.