kyleandClaude Opus 5.5
b1576c4228
- The theme/font request globals (gThemeChange*, gFont*Request, gFontChangePending, gCurrentFont*, gFontDialogRequested): only Qt read them. - The font-picker-toggle command: it only set gFontDialogRequested, so it did nothing in kge or kte. - The terminal :font and :font-size recorded requests nothing read and answered "Font requested"; they now say fonts are not available in the terminal. - kte::DisplayColumns, added for Qt's drawing and now unused. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
// TermWidth.h - terminal cell width of a decoded character
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//
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// Shared by TerminalRenderer (drawing and cursor placement) and the command
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// layer (horizontal scrolling, mouse column mapping) so they always agree.
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// Tabs are handled by the callers, which know the current column.
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#pragma once
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#include <cstddef>
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#include <cwchar>
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#include <string_view>
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namespace kte {
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// Tab stops every kTabWidth columns, in every frontend and in the command
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// layer's horizontal scrolling (they must agree, or the cursor and the
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// scroll offset are misplaced on lines with tabs).
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constexpr std::size_t kTabWidth = 8;
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// C0 controls and DEL are drawn as caret notation ("^M", "^?"): two cells.
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// ncurses would otherwise act on them (carriage return, backspace) and
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// corrupt the line.
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inline bool
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IsCaretControl(wchar_t wch)
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{
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return (wch >= 0 && wch < 0x20) || wch == 0x7f;
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}
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// C1 controls (U+0080..U+009F, also what a stray byte in that range decodes
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// to) are drawn as '?': sent raw, U+009B is a terminal CSI.
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inline bool
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IsC1Control(wchar_t wch)
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{
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return wch >= 0x80 && wch <= 0x9f;
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}
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inline int
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CellWidth(wchar_t wch)
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{
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if (IsCaretControl(wch))
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return 2;
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if (IsC1Control(wch))
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return 1;
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const int w = wcwidth(wch);
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return w < 0 ? 1 : w;
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}
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// Decode the character at line[i]: its byte length and display width in
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// cells (a tab reaches the next multiple of tabw from column col). Measures
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// the way TerminalRenderer draws: an invalid byte or NUL is one byte, measured
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// as the byte value.
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inline void
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MeasureChar(std::string_view line, std::size_t i, std::size_t col, std::size_t &len, std::size_t &width,
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std::size_t tabw = kTabWidth)
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{
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std::mbstate_t state{};
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wchar_t wch = 0;
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const auto rc = std::mbrtowc(&wch, line.data() + i, line.size() - i, &state);
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if (rc == static_cast<std::size_t>(-1) || rc == static_cast<std::size_t>(-2) || rc == 0) {
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wch = static_cast<unsigned char>(line[i]);
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len = 1;
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} else {
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len = rc;
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}
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if (wch == L'\t')
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width = tabw - (col % tabw);
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else
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width = static_cast<std::size_t>(CellWidth(wch));
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}
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} // namespace kte
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