Implement key events for tizen webview (flutter-tizen#14)

* Send key event messages from engine to plugin native about a current focused view

Author: seungsoo47

shell/platform/tizen/channels/platform_view_channel.cc

@@ -89,6 +89,27 @@ PlatformViewChannel::~PlatformViewChannel() {
   view_instances_.clear();
 }
 
+void PlatformViewChannel::sendKeyEvent(Ecore_Event_Key* key, bool is_down) {
+  auto instances = viewInstances();
+  auto it = instances.find(currentFocusedViewId());
+  if (it != instances.end()) {
+    if (is_down) {
+      it->second->dispatchKeyDownEvent(key);
+    } else {
+      it->second->dispatchKeyUpEvent(key);
+    }
+  }
+}
+
+int PlatformViewChannel::currentFocusedViewId() {
+  for (auto it = view_instances_.begin(); it != view_instances_.end(); it++) {
+    if (it->second->isFocused()) {
+      return it->second->getViewId();
+    }
+  }
+  return -1;
+}
+
 void PlatformViewChannel::HandleMethodCall(
     const flutter::MethodCall<flutter::EncodableValue>& call,
     std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result) {
@@ -113,10 +134,22 @@ void PlatformViewChannel::HandleMethodCall(
     }
     auto it = view_factories_.find(viewType);
     if (it != view_factories_.end()) {
+      auto focuesdView = view_instances_.find(currentFocusedViewId());
+      if (focuesdView != view_instances_.end()) {
+        focuesdView->second->setFocus(false);
+      }
+
       auto viewInstance =
           it->second->create(viewId, width, height, byteMessage);
+      viewInstance->setFocus(true);
       view_instances_.insert(
           std::pair<int, PlatformView*>(viewId, viewInstance));
+
+      if (channel_ != nullptr) {
+        auto id = std::make_unique<flutter::EncodableValue>(viewId);
+        channel_->InvokeMethod("viewFocused", std::move(id));
+      }
+
       result->Success(flutter::EncodableValue(viewInstance->getTextureId()));
     } else {
       LoggerE("can't find view type = %s", viewType.c_str());

shell/platform/tizen/channels/platform_view_channel.h

@@ -5,6 +5,8 @@
 #ifndef EMBEDDER_PLATFORM_VIEW_CHANNEL_H_
 #define EMBEDDER_PLATFORM_VIEW_CHANNEL_H_
 
+#include <Ecore_Input.h>
+
 #include <map>
 
 #include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/binary_messenger.h"
@@ -20,6 +22,10 @@ class PlatformViewChannel {
   std::map<std::string, std::unique_ptr<PlatformViewFactory>>& viewFactories() {
     return view_factories_;
   }
+  std::map<int, PlatformView*>& viewInstances() { return view_instances_; }
+
+  void sendKeyEvent(Ecore_Event_Key* key, bool is_down);
+  int currentFocusedViewId();
 
  private:
   std::unique_ptr<flutter::MethodChannel<flutter::EncodableValue>> channel_;

shell/platform/tizen/channels/text_input_channel.cc

@@ -21,6 +21,8 @@ static constexpr char kMultilineInputType[] = "TextInputType.multiline";
 static constexpr char kUpdateEditingStateMethod[] =
     "TextInputClient.updateEditingState";
 static constexpr char kPerformActionMethod[] = "TextInputClient.performAction";
+static constexpr char kSetPlatformViewClient[] =
+    "TextInput.setPlatformViewClient";
 static constexpr char kTextInputAction[] = "inputAction";
 static constexpr char kTextInputType[] = "inputType";
 static constexpr char kTextInputTypeName[] = "name";
@@ -329,6 +331,8 @@ void TextInputChannel::HandleMethodCall(
     ShowSoftwareKeyboard();
   } else if (method.compare(kHideMethod) == 0) {
     HideSoftwareKeyboard();
+  } else if (method.compare(kSetPlatformViewClient) == 0) {
+    // TODO: implement if necessary
   } else if (method.compare(kClearClientMethod) == 0) {
     active_model_ = nullptr;
   } else if (method.compare(kSetClientMethod) == 0) {

shell/platform/tizen/key_event_handler.cc

@@ -47,6 +47,9 @@ Eina_Bool KeyEventHandler::OnKey(void *data, int type, void *event) {
     if (engine->key_event_channel) {
       engine->key_event_channel->SendKeyEvent(key, is_down);
     }
+    if (engine->platform_view_channel) {
+      engine->platform_view_channel->sendKeyEvent(key, is_down);
+    }
   }
   return ECORE_CALLBACK_PASS_ON;
 }

shell/platform/tizen/public/flutter_platform_view.h

@@ -5,6 +5,7 @@
 #ifndef FLUTTER_SHELL_PLATFORM_TIZEN_PUBLIC_FLUTTER_PLATFORM_VIEW_H_
 #define FLUTTER_SHELL_PLATFORM_TIZEN_PUBLIC_FLUTTER_PLATFORM_VIEW_H_
 
+#include <Ecore_Input.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ -15,7 +16,10 @@ using ByteMessage = std::vector<uint8_t>;
 class PlatformView {
  public:
   PlatformView(flutter::PluginRegistrar* registrar, int viewId)
-      : registrar_(registrar), viewId_(viewId), textureId_(0) {}
+      : registrar_(registrar),
+        viewId_(viewId),
+        textureId_(0),
+        isFocused_(false) {}
   virtual ~PlatformView() {}
   int getViewId() { return viewId_; }
   int getTextureId() { return textureId_; }
@@ -27,11 +31,18 @@ class PlatformView {
                      double dy) = 0;
   virtual void setDirection(int direction) = 0;
   virtual void clearFocus() = 0;
+  void setFocus(bool f) { isFocused_ = f; }
+  bool isFocused() { return isFocused_; }
+
+  // Key input event
+  virtual void dispatchKeyDownEvent(Ecore_Event_Key* key) = 0;
+  virtual void dispatchKeyUpEvent(Ecore_Event_Key* key) = 0;
 
  private:
   flutter::PluginRegistrar* registrar_;
   int viewId_;
   int textureId_;
+  bool isFocused_;
 };
 
 class PlatformViewFactory {