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Internals: added ImDrawTextFlags_StopOnNewLine support to ImFontCalcTextSizeEx(), ImDrawTextFlags_WrapKeepTrailingBlanks to ImTextCalcWordWrapNextLineStart().

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ocornut
2025-08-27 21:55:40 +02:00
parent 71e9a449b2
commit 2efd2c61c3
2 changed files with 24 additions and 13 deletions
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32
imgui_draw.cpp
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@@ -5346,10 +5346,11 @@ ImFontBaked* ImFontAtlasBakedGetOrAdd(ImFontAtlas* atlas, ImFont* font, float fo
} }
// Trim trailing space and find beginning of next line // Trim trailing space and find beginning of next line
const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end) const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end, ImDrawTextFlags flags)
{ {
while (text < text_end && ImCharIsBlankA(*text)) if ((flags & ImDrawTextFlags_WrapKeepBlanks) == 0)
text++; while (text < text_end && ImCharIsBlankA(*text))
text++;
if (*text == '\n') if (*text == '\n')
text++; text++;
return text; return text;
@@ -5466,14 +5467,16 @@ const char* ImFont::CalcWordWrapPosition(float size, const char* text, const cha
return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width, ImDrawTextFlags_None); return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width, ImDrawTextFlags_None);
} }
ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining) ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end_display, const char* text_end, const char** out_remaining, ImVec2* out_offset, ImDrawTextFlags flags)
{ {
if (!text_end) if (!text_end)
text_end = text_begin + ImStrlen(text_begin); // FIXME-OPT: Need to avoid this. text_end = text_begin + ImStrlen(text_begin); // FIXME-OPT: Need to avoid this.
if (!text_end_display)
text_end_display = text_end;
const float line_height = size;
ImFontBaked* baked = font->GetFontBaked(size); ImFontBaked* baked = font->GetFontBaked(size);
const float scale = size / baked->Size; const float line_height = size;
const float scale = line_height / baked->Size;
ImVec2 text_size = ImVec2(0, 0); ImVec2 text_size = ImVec2(0, 0);
float line_width = 0.0f; float line_width = 0.0f;
@@ -5482,14 +5485,14 @@ ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wra
const char* word_wrap_eol = NULL; const char* word_wrap_eol = NULL;
const char* s = text_begin; const char* s = text_begin;
while (s < text_end) while (s < text_end_display)
{ {
// Word-wrapping // Word-wrapping
if (word_wrap_enabled) if (word_wrap_enabled)
{ {
// Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature. // Calculate how far we can render. Requires two passes on the string data but keeps the code simple and not intrusive for what's essentially an uncommon feature.
if (!word_wrap_eol) if (!word_wrap_eol)
word_wrap_eol = ImFontCalcWordWrapPositionEx(font, size, s, text_end, wrap_width - line_width); word_wrap_eol = ImFontCalcWordWrapPositionEx(font, size, s, text_end, wrap_width - line_width, flags);
if (s >= word_wrap_eol) if (s >= word_wrap_eol)
{ {
@@ -5497,8 +5500,10 @@ ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wra
text_size.x = line_width; text_size.x = line_width;
text_size.y += line_height; text_size.y += line_height;
line_width = 0.0f; line_width = 0.0f;
s = ImTextCalcWordWrapNextLineStart(s, text_end, flags); // Wrapping skips upcoming blanks
if (flags & ImDrawTextFlags_StopOnNewLine)
break;
word_wrap_eol = NULL; word_wrap_eol = NULL;
s = ImTextCalcWordWrapNextLineStart(s, text_end); // Wrapping skips upcoming blanks
continue; continue;
} }
} }
@@ -5516,6 +5521,8 @@ ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wra
text_size.x = ImMax(text_size.x, line_width); text_size.x = ImMax(text_size.x, line_width);
text_size.y += line_height; text_size.y += line_height;
line_width = 0.0f; line_width = 0.0f;
if (flags & ImDrawTextFlags_StopOnNewLine)
break;
continue; continue;
} }
if (c == '\r') if (c == '\r')
@@ -5539,7 +5546,10 @@ ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wra
if (text_size.x < line_width) if (text_size.x < line_width)
text_size.x = line_width; text_size.x = line_width;
if (line_width > 0 || text_size.y == 0.0f) if (out_offset != NULL)
*out_offset = ImVec2(line_width, text_size.y + line_height); // offset allow for the possibility of sitting after a trailing \n
if (line_width > 0 || text_size.y == 0.0f) // whereas size.y will ignore the trailing \n
text_size.y += line_height; text_size.y += line_height;
if (out_remaining != NULL) if (out_remaining != NULL)
@@ -5550,7 +5560,7 @@ ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wra
ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining) ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining)
{ {
return ImFontCalcTextSizeEx(this, size, max_width, wrap_width, text_begin, text_end, out_remaining); return ImFontCalcTextSizeEx(this, size, max_width, wrap_width, text_begin, NULL, text_end, out_remaining, NULL, ImDrawTextFlags_None);
} }
// Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound. // Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.

5
imgui_internal.h
View File

@@ -446,10 +446,11 @@ enum ImDrawTextFlags_
{ {
ImDrawTextFlags_None = 0, ImDrawTextFlags_None = 0,
ImDrawTextFlags_WrapKeepBlanks = 1 << 1, ImDrawTextFlags_WrapKeepBlanks = 1 << 1,
ImDrawTextFlags_StopOnNewLine = 1 << 2,
}; };
IMGUI_API ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining); IMGUI_API ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end_display, const char* text_end, const char** out_remaining, ImVec2* out_offset, ImDrawTextFlags flags);
IMGUI_API const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width, ImDrawTextFlags flags = 0); IMGUI_API const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width, ImDrawTextFlags flags = 0);
IMGUI_API const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end); // trim trailing space and find beginning of next line IMGUI_API const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end, ImDrawTextFlags flags = 0); // trim trailing space and find beginning of next line
// Helpers: File System // Helpers: File System
#ifdef IMGUI_DISABLE_FILE_FUNCTIONS #ifdef IMGUI_DISABLE_FILE_FUNCTIONS