Feature/keyboard layout support

example/simpleDemo/main.go

@@ -39,6 +39,7 @@ func main() {
 		gutter.OptionPixelRatio(1.2),
 		gutter.OptionVMArguments([]string{"--dart-non-checked-mode", "--observatory-port=50300"}),
 		gutter.OptionAddPluginReceiver(ownPlugin, "plugin_demo"),
+		gutter.OptionKeyboardLayout(gutter.KeyboardAzertyLayout),
 	}
 
 	if err = gutter.Run(options...); err != nil {

gutter.go

@@ -93,73 +93,74 @@ func glfwMouseButtonCallback(window *glfw.Window, key glfw.MouseButton, action g
 
 var state = textModel{}
 
-func glfwKeyCallback(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
+func glfwKey(keyboardLayout KeyboardShortcuts) func(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
 
-	if key == glfw.KeyEscape && action == glfw.Press {
-		w.SetShouldClose(true)
-	}
+	return func(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
+		if key == glfw.KeyEscape && action == glfw.Press {
+			w.SetShouldClose(true)
+		}
 
-	if action == glfw.Repeat || action == glfw.Press {
-		if state.clientID != 0 {
+		if action == glfw.Repeat || action == glfw.Press {
+			if state.clientID != 0 {
 
-			switch key {
-			case glfw.KeyEnter:
-				if mods == glfw.ModControl {
-					performAction(w, "done")
-				} else {
-					state.addChar([]rune{'\n'})
-					performAction(w, "newline")
-				}
+				switch key {
+				case glfw.KeyEnter:
+					if mods == glfw.ModControl {
+						performAction(w, "done")
+					} else {
+						state.addChar([]rune{'\n'})
+						performAction(w, "newline")
+					}
 
-			case glfw.KeyHome:
-				state.MoveCursorHome(int(mods))
+				case glfw.KeyHome:
+					state.MoveCursorHome(int(mods))
 
-			case glfw.KeyEnd:
-				state.MoveCursorEnd(int(mods))
+				case glfw.KeyEnd:
+					state.MoveCursorEnd(int(mods))
 
-			case glfw.KeyLeft:
-				state.MoveCursorLeft(int(mods))
+				case glfw.KeyLeft:
+					state.MoveCursorLeft(int(mods))
 
-			case glfw.KeyRight:
-				state.MoveCursorRight(int(mods))
+				case glfw.KeyRight:
+					state.MoveCursorRight(int(mods))
 
-			case glfw.KeyDelete:
-				state.Delete(int(mods))
+				case glfw.KeyDelete:
+					state.Delete(int(mods))
 
-			case glfw.KeyBackspace:
-				state.Backspace(int(mods))
+				case glfw.KeyBackspace:
+					state.Backspace(int(mods))
 
-			case glfw.KeyA:
-				if mods == glfw.ModControl {
-					state.SelectAll()
-				}
+				case keyboardLayout.SelectAll:
+					if mods == glfw.ModControl {
+						state.SelectAll()
+					}
 
-			case glfw.KeyC:
-				if mods == glfw.ModControl && state.isSelected() {
-					_, _, selectedContent := state.GetSelectedText()
-					w.SetClipboardString(selectedContent)
-				}
+				case keyboardLayout.Copy:
+					if mods == glfw.ModControl && state.isSelected() {
+						_, _, selectedContent := state.GetSelectedText()
+						w.SetClipboardString(selectedContent)
+					}
 
-			case glfw.KeyX:
-				if mods == glfw.ModControl && state.isSelected() {
-					_, _, selectedContent := state.GetSelectedText()
-					w.SetClipboardString(selectedContent)
-					state.RemoveSelectedText()
-				}
+				case keyboardLayout.Cut:
+					if mods == glfw.ModControl && state.isSelected() {
+						_, _, selectedContent := state.GetSelectedText()
+						w.SetClipboardString(selectedContent)
+						state.RemoveSelectedText()
+					}
 
-			case glfw.KeyV:
-				if mods == glfw.ModControl {
-					var clpString, err = w.GetClipboardString()
-					if err != nil {
-						log.Printf("unable to get the clipboard content: %v\n", err)
-					} else {
-						state.addChar([]rune(clpString))
+				case keyboardLayout.Paste:
+					if mods == glfw.ModControl {
+						var clpString, err = w.GetClipboardString()
+						if err != nil {
+							log.Printf("unable to get the clipboard content: %v\n", err)
+						} else {
+							state.addChar([]rune(clpString))
+						}
 					}
 				}
 			}
 		}
 	}
-
 }
 
 func glfwWindowSizeCallback(window *glfw.Window, width int, height int) {
@@ -242,6 +243,13 @@ func runFlutter(window *glfw.Window, c config) *flutter.EngineOpenGL {
 
 	width, height := window.GetFramebufferSize()
 	glfwWindowSizeCallback(window, width, height)
+	var glfwKeyCallback func(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey)
+
+	if c.KeyboardLayout != nil {
+		glfwKeyCallback = glfwKey(*c.KeyboardLayout)
+	} else {
+		glfwKeyCallback = glfwKey(KeyboardQwertyLayout)
+	}
 
 	window.SetKeyCallback(glfwKeyCallback)
 	window.SetFramebufferSizeCallback(glfwWindowSizeCallback)
@@ -286,11 +294,11 @@ func performAction(window *glfw.Window, action string) {
 		"TextInputAction." + action,
 	})
 	message := flutter.Message{
-		Args: actionArgs,
-		Method:"TextInputClient.performAction",
+		Args:   actionArgs,
+		Method: "TextInputClient.performAction",
 	}
 	var mess = &flutter.PlatformMessage{
-		Channel:textInputChannel,
+		Channel: textInputChannel,
 		Message: message,
 	}
 	flutterOGL := flutter.SelectEngine(0)

keyboard.go

@@ -0,0 +1,19 @@
+package gutter
+
+import "github.com/go-gl/glfw/v3.2/glfw"
+
+// KeyboardQwertyLayout  is the default key for shortcuts (US-layout)
+var KeyboardQwertyLayout = KeyboardShortcuts{
+	Cut:       glfw.KeyX,
+	Copy:      glfw.KeyC,
+	Paste:     glfw.KeyV,
+	SelectAll: glfw.KeyA,
+}
+
+// KeyboardAzertyLayout gives an Azerty layout (french)
+var KeyboardAzertyLayout = KeyboardShortcuts{
+	Cut:       glfw.KeyX,
+	Copy:      glfw.KeyC,
+	Paste:     glfw.KeyV,
+	SelectAll: glfw.KeyQ,
+}

option.go

@@ -86,6 +86,14 @@ func OptionAddPluginReceiver(handler PluginReceivers, channelName string) Option
 	}
 }
 
+// OptionKeyboardLayout allow application to support keyboard that have a different layout
+// when the FlutterEngine send a PlatformMessage to the Embedder
+func OptionKeyboardLayout(keyboardLayout KeyboardShortcuts) Option {
+	return func(c *config) {
+		c.KeyboardLayout = &keyboardLayout
+	}
+}
+
 type config struct {
 	WindowDimension struct {
 		x int
@@ -97,6 +105,16 @@ type config struct {
 	PixelRatio               float64
 	VMArguments              []string
 	PlatformMessageReceivers map[string][]PluginReceivers // The Key is the Channel name.
+	KeyboardLayout           *KeyboardShortcuts
+}
+
+// KeyboardShortcuts Struct where user can define his own keyboard shortcut.
+// This will allow application to support keyboard layout different from US layout
+type KeyboardShortcuts struct {
+	Cut       glfw.Key
+	Copy      glfw.Key
+	Paste     glfw.Key
+	SelectAll glfw.Key
 }
 
 func (t config) merge(options ...Option) config {