fix(ime): composition window position problem (#36, #175)

Author: ArcticLampyrid

include/LCUI/ime.h

@@ -38,6 +38,7 @@ typedef struct LCUI_IMEHandlerRec_ {
 	void (*totext)(int);
 	LCUI_BOOL (*open)(void);
 	LCUI_BOOL (*close)(void);
+	void (*setcaret)(int, int);
 } LCUI_IMEHandlerRec, *LCUI_IMEHandler;
 
 /** 注册一个输入法 */
@@ -72,6 +73,8 @@ int LCUI_RegisterWin32IME(void);
 int LCUI_RegisterLinuxIME(void);
 #endif
 
+LCUI_API void LCUIIME_SetCaret(int x, int y);
+
 LCUI_END_HEADER
 
 #endif

src/gui/widget/textcaret.c

@@ -34,6 +34,7 @@
 #include <LCUI/gui/widget.h>
 #include <LCUI/gui/widget/textcaret.h>
 #include <LCUI/gui/css_parser.h>
+#include <LCUI/ime.h>
 
 /** 文本插入符相关数据 */
 typedef struct LCUI_TextCaretRec_ {
@@ -59,11 +60,16 @@ textcaret {
 
 void TextCaret_Refresh(LCUI_Widget widget)
 {
+	float x, y;
+
 	LCUI_TextCaret caret = Widget_GetData(widget, prototype);
+
 	if (!caret->visible) {
 		return;
 	}
 	LCUITimer_Reset(caret->timer_id, caret->blink_interval);
+	Widget_GetOffset(widget, LCUIWidget_GetRoot(), &x, &y);
+	LCUIIME_SetCaret((int)x, (int)y);
 	Widget_Show(widget);
 }
 
@@ -101,7 +107,7 @@ static void TextCaret_OnInit(LCUI_Widget widget)
 	caret->blink_interval = 500;
 	caret->visible = FALSE;
 	caret->timer_id = LCUI_SetInterval(caret->blink_interval,
-					   TextCaret_OnBlink, widget);
+		TextCaret_OnBlink, widget);
 }
 
 void TextCaret_SetBlinkTime(LCUI_Widget widget, unsigned int n_ms)

src/ime.c

@@ -270,6 +270,13 @@ void LCUI_InitIME(void)
 #endif
 }
 
+void LCUIIME_SetCaret(int x, int y)
+{
+	if (self.ime->handler.setcaret) {
+		self.ime->handler.setcaret(x, y);
+	}
+}
+
 void LCUI_FreeIME(void)
 {
 	self.active = FALSE;

src/platform/linux/linux_ime.c

@@ -88,6 +88,7 @@ int LCUI_RegisterLinuxIME(void)
 		handler.totext = X11IME_ToText;
 		handler.close = X11IME_Close;
 		handler.open = X11IME_Open;
+		handler.setcaret = NULL;
 		return LCUIIME_Register("LCUI X11 Input Method", &handler);
 	}
 #endif

src/platform/windows/windows_ime.c

@@ -32,14 +32,15 @@
 #include <string.h>
 #include <stdlib.h>
 #include <LCUI_Build.h>
-
 #ifdef LCUI_BUILD_IN_WIN32
 #include <LCUI/LCUI.h>
 #include <LCUI/input.h>
 #include <LCUI/ime.h>
 #include <LCUI/platform.h>
 #include LCUI_EVENTS_H
 
+#pragma comment(lib, "Imm32.lib")
+
 static LCUI_BOOL IME_ProcessKey(int key, int key_state)
 {
 	return FALSE;
@@ -60,6 +61,20 @@ static void WinIME_OnChar(LCUI_Event e, void *arg)
 	LCUIIME_Commit(text, 2);
 }
 
+static void IME_SetCaret(int x, int y)
+{
+	HWND hwnd = GetActiveWindow();
+	HIMC himc = ImmGetContext(hwnd);
+	if (himc) {
+		COMPOSITIONFORM composition;
+		composition.dwStyle = CFS_POINT;
+		composition.ptCurrentPos.x = x;
+		composition.ptCurrentPos.y = y;
+		ImmSetCompositionWindow(himc, &composition);
+		ImmReleaseContext(hwnd, himc);
+	}
+}
+
 static LCUI_BOOL IME_Open(void)
 {
 	LCUI_BindSysEvent(WM_CHAR, WinIME_OnChar, NULL, NULL);
@@ -79,6 +94,7 @@ int LCUI_RegisterWin32IME(void)
 	handler.totext = IME_ToText;
 	handler.close = IME_Close;
 	handler.open = IME_Open;
+	handler.setcaret = IME_SetCaret;
 	return LCUIIME_Register("LCUI Input Method", &handler);
 }