优化IME光标位置更新：使用作用域退出机制简化资源管理

src/mirage_render/src/ime/windows/windows_ime.cpp

@@ -4,6 +4,7 @@
 #include <windows.h>
 
 #include "misc/log_util.h"
+#include "misc/scope_exit.h"
 #include "platform_window/platform_window.h"
 
 bool ime::update_cursor_pos(void* in_window_native) {
@@ -13,14 +14,17 @@ bool ime::update_cursor_pos(void* in_window_native) {
 		log_error("IME: failed to get IME context");
 		return false;
 	}
+	ON_SCOPE_EXIT{
+		ImmReleaseContext(hwnd, himc);
+	};
+
+	// 将客户区坐标转换为屏幕坐标
+	POINT point = { cursor_pos_.x(), cursor_pos_.y() };
 
 	// 设置组合窗口位置（跟随光标）
 	COMPOSITIONFORM cf;
-	cf.dwStyle        = CFS_POINT;
-	cf.ptCurrentPos.x = cursor_pos_.x();
-	cf.ptCurrentPos.y = cursor_pos_.y();
+	cf.dwStyle = CFS_POINT;
+	cf.ptCurrentPos = point;
 	ImmSetCompositionWindow(himc, &cf);
-
-	ImmReleaseContext(hwnd, himc);
 	return true;
 }

src/mirage_render/src/platform_window/windows/windows_window_event.cpp

@@ -323,12 +323,14 @@ namespace ime_events {
 	}
 
 	LRESULT handle_window_ime_set_context(HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param) {
-		// 获取输入法上下文
-		HIMC himc = ImmGetContext(hwnd);
-		if (!himc)
-			return DEFAULT_PROCESS;
-
 		ime::get().update_cursor_pos(hwnd);
+
+		// 对于WM_IME_SETCONTEXT，如果要显示系统的输入法UI
+		if (w_param == TRUE) {
+			// 保持系统默认值以显示输入法UI
+			l_param |= ISC_SHOWUICOMPOSITIONWINDOW;
+			return DEFAULT_PROCESS;
+		}
 		return 0;
 	}
 
@@ -345,26 +347,7 @@ namespace ime_events {
 		if (!ime::get().has_processors())
 			return DEFAULT_PROCESS;
 
-		// 获取输入法上下文
-		HIMC himc = ImmGetContext(hwnd);
-		if (!himc)
-			return DEFAULT_PROCESS;
-
 		ime::get().update_cursor_pos(hwnd);
-
-		// 设置组合窗口字体
-		LOGFONT lf;
-		GetObject(GetStockObject(DEFAULT_GUI_FONT), sizeof(LOGFONT), &lf);
-		ImmSetCompositionFont(himc, &lf);
-
-		ImmReleaseContext(hwnd, himc);
-
-		// 对于WM_IME_SETCONTEXT，如果要显示系统的输入法UI
-		if (msg == WM_IME_SETCONTEXT && w_param == TRUE) {
-			// 保持系统默认值以显示输入法UI
-			l_param |= ISC_SHOWUICOMPOSITIONWINDOW;
-			return DEFAULT_PROCESS;
-		}
 		return 0;
 	}