fix ui widgets

src/platform/platform.h

@@ -3,6 +3,46 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+////////////////////////////////
+// Input event buffer
+// Accumulated per frame, consumed by the app each tick.
+
+#define PLATFORM_MAX_CHARS_PER_FRAME 64
+#define PLATFORM_MAX_KEYS_PER_FRAME  32
+
+// Virtual key codes (subset matching Win32 VK_ codes)
+enum {
+    PKEY_BACKSPACE = 0x08,
+    PKEY_TAB       = 0x09,
+    PKEY_RETURN    = 0x0D,
+    PKEY_ESCAPE    = 0x1B,
+    PKEY_DELETE    = 0x2E,
+    PKEY_LEFT      = 0x25,
+    PKEY_UP        = 0x26,
+    PKEY_RIGHT     = 0x27,
+    PKEY_DOWN      = 0x28,
+    PKEY_HOME      = 0x24,
+    PKEY_END       = 0x23,
+    PKEY_A         = 0x41,
+    PKEY_C         = 0x43,
+    PKEY_V         = 0x56,
+    PKEY_X         = 0x58,
+};
+
+struct PlatformInputEvents {
+    // Typed characters (UTF-16 code units, printable only)
+    uint16_t chars[PLATFORM_MAX_CHARS_PER_FRAME];
+    int32_t  char_count;
+
+    // Key-down events (virtual key codes)
+    uint8_t  keys[PLATFORM_MAX_KEYS_PER_FRAME];
+    int32_t  key_count;
+
+    // Modifier state at time of last key event
+    bool     ctrl_held;
+    bool     shift_held;
+};
+
 struct PlatformWindow;
 
 struct PlatformWindowDesc {
@@ -36,3 +76,6 @@ void           *platform_get_native_handle(PlatformWindow *window);
 void            platform_set_frame_callback(PlatformWindow *window, PlatformFrameCallback cb, void *user_data);
 void            platform_set_menu(PlatformWindow *window, PlatformMenu *menus, int32_t menu_count);
 int32_t         platform_poll_menu_command(PlatformWindow *window);
+
+// Returns accumulated input events since last call, then clears the buffer.
+PlatformInputEvents platform_get_input_events(PlatformWindow *window);