Support keycode translation on macos shell

Differential Revision: D68856456

fbshipit-source-id: b9080d64ad0a75cd406a59d0cd31982c39fb5418

IGLU/imgui/InputListener.cpp

@@ -8,7 +8,7 @@
 // @MARK:COVERAGE_EXCLUDE_FILE
 
 #include "InputListener.h"
-
+#include "KeyCodeTranslator.h"
 // ImGui has a very awkward expectation when it comes to processing inputs and making decisions
 // based on them. This is what it expects clients to do, in order, every frame:
 // 1. Send ImGui all events via the input parameters in ImGuiIO.
@@ -70,7 +70,10 @@ bool InputListener::process(const igl::shell::KeyEvent& event) {
   makeCurrentContext();
 
   ImGuiIO& io = ImGui::GetIO();
-  io.KeysDown[event.key] = event.isDown;
+  // support IsKeyDown
+  io.KeysDown[keyFromShellKeyEvent(event)] = event.isDown;
+  // support IsKeyPressed
+  io.KeysData[keyFromShellKeyEvent(event)].Down = event.isDown;
   return io.WantCaptureKeyboard;
 }
 

IGLU/imgui/KeyCodeTranslator.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "KeyCodeTranslator.h"
+
+#include <igl/Macros.h>
+
+#if IGL_PLATFORM_APPLE
+namespace {
+enum KeyModifiers {
+  kVK_Return = 0x24,
+  kVK_Tab = 0x30,
+  kVK_Delete = 0x33,
+  kVK_Escape = 0x35,
+  kVK_Shift = 0x38,
+  kVK_Option = 0x3A,
+  kVK_Control = 0x3B,
+};
+
+IGL_MAYBE_UNUSED ImGuiKey keyFromShellKeyEventApple(igl::shell::KeyEvent event) {
+  KeyModifiers keyCode = (KeyModifiers)event.key;
+
+  switch (keyCode) {
+  case KeyModifiers::kVK_Return:
+    return ImGuiKey_Enter;
+  case KeyModifiers::kVK_Tab:
+    return ImGuiKey_Tab;
+  case KeyModifiers::kVK_Delete:
+    return ImGuiKey_Backspace;
+  case KeyModifiers::kVK_Escape:
+    return ImGuiKey_Escape;
+  case KeyModifiers::kVK_Shift:
+    return ImGuiKey_LeftShift;
+  case KeyModifiers::kVK_Option:
+    return ImGuiKey_LeftAlt;
+  default:
+    return (ImGuiKey)keyCode;
+  }
+}
+} // namespace
+#endif
+
+namespace iglu::imgui {
+ImGuiKey keyFromShellKeyEvent(igl::shell::KeyEvent event) {
+#if IGL_PLATFORM_APPLE
+  return keyFromShellKeyEventApple(event);
+#endif
+  return (ImGuiKey)event.key;
+}
+} // namespace iglu::imgui

IGLU/imgui/KeyCodeTranslator.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include "imgui.h"
+#include <shell/shared/input/KeyListener.h>
+
+namespace iglu::imgui {
+ImGuiKey keyFromShellKeyEvent(igl::shell::KeyEvent event);
+} // namespace iglu::imgui