From 17dc2decf6841bd81f401fa741bbf3ef26db56d6 Mon Sep 17 00:00:00 2001
From: ksuprynowicz <ksuprynowicz@post.pl>
Date: Sat, 27 May 2023 00:08:24 +0200
Subject: [PATCH] Initial IME support

---
 interface/src/Application.cpp    | 29 +++++++++++++++++++++++++++++
 interface/src/Application.h      |  1 +
 libraries/gl/src/gl/GLWidget.cpp | 11 +++++++++++
 libraries/ui/src/OffscreenUi.cpp |  6 ++++++
 4 files changed, 47 insertions(+)

diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index b5984c6b65..510350221e 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -4181,6 +4181,31 @@ static inline bool isKeyEvent(QEvent::Type type) {
     return type == QEvent::KeyPress || type == QEvent::KeyRelease;
 }
 
+bool Application::handleInputMethodEventForFocusedEntity(QEvent* event) {
+    if (_keyboardFocusedEntity.get() != UNKNOWN_ENTITY_ID) {
+        switch (event->type()) {
+            case QEvent::InputMethod:
+            case QEvent::InputMethodQuery:
+            {
+                auto eventHandler = getEntities()->getEventHandler(_keyboardFocusedEntity.get());
+                if (eventHandler) {
+                    event->setAccepted(false);
+                    QCoreApplication::sendEvent(eventHandler, event);
+                    if (event->isAccepted()) {
+                        _lastAcceptedKeyPress = usecTimestampNow();
+                        return true;
+                    }
+                }
+                break;
+            }
+            default:
+                break;
+        }
+    }
+
+    return false;
+}
+
 bool Application::handleKeyEventForFocusedEntity(QEvent* event) {
     if (_keyboardFocusedEntity.get() != UNKNOWN_ENTITY_ID) {
         switch (event->type()) {
@@ -4241,6 +4266,10 @@ bool Application::event(QEvent* event) {
         return false;
     }
 
+    if ((event->type() == QEvent::InputMethod || event->type() == QEvent::InputMethodQuery) && handleInputMethodEventForFocusedEntity(event)) {
+        return true;
+    }
+
     // Allow focused Entities to handle keyboard input
     if (isKeyEvent(event->type()) && handleKeyEventForFocusedEntity(event)) {
         return true;
diff --git a/interface/src/Application.h b/interface/src/Application.h
index 005ec3cb18..bfd3aa6ac2 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -565,6 +565,7 @@ private:
     bool initMenu();
     void pauseUntilLoginDetermined();
     void resumeAfterLoginDialogActionTaken();
+    bool handleInputMethodEventForFocusedEntity(QEvent* event);
     bool handleKeyEventForFocusedEntity(QEvent* event);
     bool handleFileOpenEvent(QFileOpenEvent* event);
     void cleanupBeforeQuit();
diff --git a/libraries/gl/src/gl/GLWidget.cpp b/libraries/gl/src/gl/GLWidget.cpp
index 45c8e70659..e84e109da9 100644
--- a/libraries/gl/src/gl/GLWidget.cpp
+++ b/libraries/gl/src/gl/GLWidget.cpp
@@ -39,6 +39,7 @@ GLWidget::GLWidget() {
     setAttribute(Qt::WA_NativeWindow);
     setAttribute(Qt::WA_PaintOnScreen);
     setAttribute(Qt::WA_NoSystemBackground);
+    setAttribute(Qt::WA_InputMethodEnabled);
     setAutoFillBackground(false);
     grabGesture(Qt::PinchGesture);
     setAcceptDrops(true);
@@ -106,6 +107,16 @@ bool GLWidget::event(QEvent* event) {
                 return true;
             }
             break;
+        case QEvent::InputMethod:
+            if (QCoreApplication::sendEvent(QCoreApplication::instance(), event)) {
+                return true;
+            }
+            break;
+        case QEvent::InputMethodQuery:
+            if (QCoreApplication::sendEvent(QCoreApplication::instance(), event)) {
+                return true;
+            }
+            break;
 
         default:
             break;
diff --git a/libraries/ui/src/OffscreenUi.cpp b/libraries/ui/src/OffscreenUi.cpp
index 07376cf761..143a472722 100644
--- a/libraries/ui/src/OffscreenUi.cpp
+++ b/libraries/ui/src/OffscreenUi.cpp
@@ -1145,6 +1145,12 @@ bool OffscreenUi::eventFilter(QObject* originalDestination, QEvent* event) {
             }
             break;
         }
+        case QEvent::InputMethod:
+        case QEvent::InputMethodQuery:
+            if (QCoreApplication::sendEvent(getWindow(), event)) {
+                return result;
+            }
+            break;
         default:
             break;
     }