Add API: SetPreeditCallback

This is for GLFW3 Preedit Callback: glfwSetPreeditCallback

Author: daipom

src/raylib.h

@@ -1092,6 +1092,14 @@ RLAPI unsigned char *DecodeDataBase64(const unsigned char *data, int *outputSize
 //------------------------------------------------------------------------------------
 // Input Handling Functions (Module: core)
 //------------------------------------------------------------------------------------
+// Callback for preedit text.
+// preeditLength: The length of preedit text
+// preeditString: The preedit text (unicode)
+// blockCount: The number of all converting blocks
+// blockSizes: The size of each converting block
+// focusedBlock: The index of the current converting block
+// caret: The index of the caret in preeditString
+typedef void (*PreeditCallback)(int preeditLength, int *preeditString, int blockCount, int *blockSizes, int focusedBlock, int caret);
 
 // Input-related functions: keyboard
 RLAPI bool IsKeyPressed(int key);                             // Check if a key has been pressed once
@@ -1101,6 +1109,7 @@ RLAPI bool IsKeyUp(int key);                                  // Check if a key
 RLAPI void SetExitKey(int key);                               // Set a custom key to exit program (default is ESC)
 RLAPI int GetKeyPressed(void);                                // Get key pressed (keycode), call it multiple times for keys queued, returns 0 when the queue is empty
 RLAPI int GetCharPressed(void);                               // Get char pressed (unicode), call it multiple times for chars queued, returns 0 when the queue is empty
+RLAPI void SetPreeditCallback(PreeditCallback callback);      // Set a callback for preedit
 
 // Input-related functions: gamepads
 RLAPI bool IsGamepadAvailable(int gamepad);                   // Check if a gamepad is available

src/rcore.c

@@ -438,6 +438,8 @@ typedef struct CoreData {
             int charPressedQueue[MAX_CHAR_PRESSED_QUEUE];   // Input characters queue (unicode)
             int charPressedQueueCount;      // Input characters queue count
 
+            PreeditCallback preeditCallback;                // Preedit callback
+
 #if defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
             int defaultMode;                // Default keyboard mode
 #if defined(SUPPORT_SSH_KEYBOARD_RPI)
@@ -639,6 +641,7 @@ static void WindowDropCallback(GLFWwindow *window, int count, const char **paths
 // Input callbacks events
 static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods);  // GLFW3 Keyboard Callback, runs on key pressed
 static void CharCallback(GLFWwindow *window, unsigned int key);                            // GLFW3 Char Key Callback, runs on key pressed (get char value)
+static void PreeditCallbackInner(GLFWwindow *window, int preeditLength, unsigned int *preeditString, int blockCount, int *blockSizes, int focusedBlock, int caret); // GLFW3 Preedit Callback
 static void MouseButtonCallback(GLFWwindow *window, int button, int action, int mods);     // GLFW3 Mouse Button Callback, runs on mouse button pressed
 static void MouseCursorPosCallback(GLFWwindow *window, double x, double y);                // GLFW3 Cursor Position Callback, runs on mouse move
 static void MouseScrollCallback(GLFWwindow *window, double xoffset, double yoffset);       // GLFW3 Srolling Callback, runs on mouse wheel
@@ -3545,6 +3548,12 @@ int GetCharPressed(void)
     return value;
 }
 
+// Set a callback for preedit
+void SetPreeditCallback(PreeditCallback callback)
+{
+    CORE.Input.Keyboard.preeditCallback = callback;
+}
+
 // Set a custom key to exit program
 // NOTE: default exitKey is ESCAPE
 void SetExitKey(int key)
@@ -4141,6 +4150,7 @@ static bool InitGraphicsDevice(int width, int height)
     // Set input callback events
     glfwSetKeyCallback(CORE.Window.handle, KeyCallback);
     glfwSetCharCallback(CORE.Window.handle, CharCallback);
+    glfwSetPreeditCallback(CORE.Window.handle, PreeditCallbackInner);
     glfwSetMouseButtonCallback(CORE.Window.handle, MouseButtonCallback);
     glfwSetCursorPosCallback(CORE.Window.handle, MouseCursorPosCallback);   // Track mouse position changes
     glfwSetScrollCallback(CORE.Window.handle, MouseScrollCallback);
@@ -5380,6 +5390,14 @@ static void CharCallback(GLFWwindow *window, unsigned int key)
     }
 }
 
+ // GLFW3 Preedit Callback
+static void PreeditCallbackInner(GLFWwindow *window, int preeditLength, unsigned int *preeditString, int blockCount, int *blockSizes, int focusedBlock, int caret)
+{
+    if (!CORE.Input.Keyboard.preeditCallback) return;
+    CORE.Input.Keyboard.preeditCallback(preeditLength, (int *)preeditString, blockCount, blockSizes, focusedBlock, caret);
+}
+
+
 // GLFW3 Mouse Button Callback, runs on mouse button pressed
 static void MouseButtonCallback(GLFWwindow *window, int button, int action, int mods)
 {