[windows] Add key event support (#193)

Enables the GLFW raw key event handler for Windows.

Author: stuartmorgan

library/windows/GLFW Library.vcxproj

@@ -263,6 +263,7 @@
     </PreLinkEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="..\common\glfw\key_event_handler.cc" />
     <ClCompile Include="..\common\glfw\text_input_plugin.cc" />
     <ClCompile Include="..\common\internal\engine_method_result.cc" />
     <ClCompile Include="..\common\internal\json_message_codec.cc" />

library/windows/GLFW Library.vcxproj.filters

@@ -21,6 +21,45 @@
     <ClCompile Include="..\common\internal\plugin_handler.cc">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\common\glfw\text_input_plugin.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\internal\engine_method_result.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\internal\json_message_codec.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\internal\text_input_model.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\json_method_call.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\json_method_codec.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\json_plugin.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\method_call.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\method_channel.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\method_codec.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\method_result.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\plugin.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\common\glfw\key_event_handler.cc">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="embedder.h">
@@ -32,4 +71,4 @@
       <Filter>Source Files</Filter>
     </None>
   </ItemGroup>
-</Project>
+</Project>

library/windows/embedder.cpp

@@ -21,6 +21,7 @@
 
 #include <flutter_embedder.h>
 
+#include "library/common/glfw/key_event_handler.h"
 #include "library/common/glfw/keyboard_hook_handler.h"
 #include "library/common/glfw/text_input_plugin.h"
 #include "library/common/internal/plugin_handler.h"
@@ -36,6 +37,10 @@ struct FlutterEmbedderState {
   // deleted from the heap.
   std::vector<flutter_desktop_embedding::KeyboardHookHandler *>
       keyboard_hook_handlers;
+
+  // Handles raw key interactions from GLFW.
+  // TODO: Revisit ownership model once Issue #102 is resolved.
+  std::unique_ptr<flutter_desktop_embedding::KeyEventHandler> key_event_handler;
 };
 
 static constexpr char kDefaultWindowTitle[] = "Flutter";
@@ -268,6 +273,10 @@ GLFWwindow *CreateFlutterWindow(size_t initial_width, size_t initial_height,
   FlutterEmbedderState *state = new FlutterEmbedderState();
   state->plugin_handler = std::make_unique<PluginHandler>(engine);
   state->engine = engine;
+
+  state->key_event_handler =
+      std::make_unique<KeyEventHandler>(state->plugin_handler.get());
+  state->keyboard_hook_handlers.push_back(state->key_event_handler.get());
   auto input_plugin = std::make_unique<TextInputPlugin>();
   state->keyboard_hook_handlers.push_back(input_plugin.get());