Internals: Added ImTextFindPreviousUtf8Codepoint() helper + comments.

imgui.cpp

@@ -2265,6 +2265,18 @@ int ImTextCountUtf8BytesFromStr(const ImWchar* in_text, const ImWchar* in_text_e
     }
     return bytes_count;
 }
+
+const char* ImTextFindPreviousUtf8Codepoint(const char* in_text_start, const char* in_text_curr)
+{
+    while (in_text_curr > in_text_start)
+    {
+        in_text_curr--;
+        if ((*in_text_curr & 0xC0) != 0x80)
+            return in_text_curr;
+    }
+    return in_text_start;
+}
+
 IM_MSVC_RUNTIME_CHECKS_RESTORE
 
 //-----------------------------------------------------------------------------

imgui.h

@@ -2039,7 +2039,7 @@ struct ImGuiIO
     // (default to use native imm32 api on Windows)
     void        (*SetPlatformImeDataFn)(ImGuiViewport* viewport, ImGuiPlatformImeData* data);
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    void*       ImeWindowHandle;                // = NULL           // [Obsolete] Set ImGuiViewport::PlatformHandleRaw instead. Set this to your HWND to get automatic IME cursor positioning.
+    void*       ImeWindowHandle;                // = NULL           // [Obsoleted in 1.87] Set ImGuiViewport::PlatformHandleRaw instead. Set this to your HWND to get automatic IME cursor positioning.
 #else
     void*       _UnusedPadding;                                     // Unused field to keep data structure the same size.
 #endif

imgui_internal.h

@@ -348,18 +348,18 @@ static inline bool      ImIsPowerOfTwo(ImU64 v)         { return v != 0 && (v &
 static inline int       ImUpperPowerOfTwo(int v)        { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; v++; return v; }
 
 // Helpers: String
-IMGUI_API int           ImStricmp(const char* str1, const char* str2);
+IMGUI_API int           ImStricmp(const char* str1, const char* str2);                      // Case insensitive compare.
-IMGUI_API int           ImStrnicmp(const char* str1, const char* str2, size_t count);
+IMGUI_API int           ImStrnicmp(const char* str1, const char* str2, size_t count);       // Case insensitive compare to a certain count.
-IMGUI_API void          ImStrncpy(char* dst, const char* src, size_t count);
+IMGUI_API void          ImStrncpy(char* dst, const char* src, size_t count);                // Copy to a certain count and always zero terminate (strncpy doesn't).
-IMGUI_API char*         ImStrdup(const char* str);
+IMGUI_API char*         ImStrdup(const char* str);                                          // Duplicate a string.
-IMGUI_API char*         ImStrdupcpy(char* dst, size_t* p_dst_size, const char* str);
+IMGUI_API char*         ImStrdupcpy(char* dst, size_t* p_dst_size, const char* str);        // Copy in provided buffer, recreate buffer if needed.
-IMGUI_API const char*   ImStrchrRange(const char* str_begin, const char* str_end, char c);
+IMGUI_API const char*   ImStrchrRange(const char* str_begin, const char* str_end, char c);  // Find first occurrence of 'c' in string range.
-IMGUI_API int           ImStrlenW(const ImWchar* str);
 IMGUI_API const char*   ImStreolRange(const char* str, const char* str_end);                // End end-of-line
-IMGUI_API const ImWchar*ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin);   // Find beginning-of-line
+IMGUI_API const char*   ImStristr(const char* haystack, const char* haystack_end, const char* needle, const char* needle_end);  // Find a substring in a string range.
-IMGUI_API const char*   ImStristr(const char* haystack, const char* haystack_end, const char* needle, const char* needle_end);
+IMGUI_API void          ImStrTrimBlanks(char* str);                                         // Remove leading and trailing blanks from a buffer.
-IMGUI_API void          ImStrTrimBlanks(char* str);
+IMGUI_API const char*   ImStrSkipBlank(const char* str);                                    // Find first non-blank character.
-IMGUI_API const char*   ImStrSkipBlank(const char* str);
+IMGUI_API int           ImStrlenW(const ImWchar* str);                                      // Computer string length (ImWchar string)
+IMGUI_API const ImWchar*ImStrbolW(const ImWchar* buf_mid_line, const ImWchar* buf_begin);   // Find beginning-of-line (ImWchar string)
 IM_MSVC_RUNTIME_CHECKS_OFF
 static inline char      ImToUpper(char c)               { return (c >= 'a' && c <= 'z') ? c &= ~32 : c; }
 static inline bool      ImCharIsBlankA(char c)          { return c == ' ' || c == '\t'; }
@@ -386,6 +386,7 @@ IMGUI_API int           ImTextStrFromUtf8(ImWchar* out_buf, int out_buf_size, co
 IMGUI_API int           ImTextCountCharsFromUtf8(const char* in_text, const char* in_text_end);                                 // return number of UTF-8 code-points (NOT bytes count)
 IMGUI_API int           ImTextCountUtf8BytesFromChar(const char* in_text, const char* in_text_end);                             // return number of bytes to express one char in UTF-8
 IMGUI_API int           ImTextCountUtf8BytesFromStr(const ImWchar* in_text, const ImWchar* in_text_end);                        // return number of bytes to express string in UTF-8
+IMGUI_API const char*   ImTextFindPreviousUtf8Codepoint(const char* in_text_start, const char* in_text_curr);                   // return previous UTF-8 code-point.
 
 // Helpers: File System
 #ifdef IMGUI_DISABLE_FILE_FUNCTIONS