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Fix wrong preedit cursor position in Qt5

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This commit is contained in:
Koji Yokota 2024-08-20 21:11:15 +09:00
parent 20548fbd0c
commit 0562b13743
1 changed files with 36 additions and 14 deletions
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32
src/frontends/qt/GuiWorkArea.cpp
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@ -1227,11 +1227,20 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
// get attributes of input method cursor.
// cursor_pos : cursor position in preedit string.
size_t cursor_pos = 0;
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
bool cursor_is_visible = false;
#endif
for (auto const & attr : preedit_attr_) {
if (attr.type == QInputMethodEvent::Cursor) {
// in the completing mode, cursor_pos comes after the selected
// snippet in Qt 5
// in Qt 6, it comes at the head of the selected snippet
cursor_pos = size_t(attr.start);
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
cursor_is_visible = attr.length != 0;
#endif
break;
}
}
@ -1244,21 +1253,34 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
size_t rStart = 0;
// rLength : selected string length in IM.
size_t rLength = 0;
if (cursor_pos < preedit_length) {
for (auto const & attr : preedit_attr_) {
if (attr.type == QInputMethodEvent::TextFormat) {
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
if (attr.start <= int(cursor_pos)
&& int(cursor_pos) < attr.start + attr.length) {
// we are in the completing mode
// (selecting the right chars from candidates)
rStart = size_t(attr.start);
rLength = size_t(attr.length);
if (!cursor_is_visible)
cursor_pos += rLength;
break;
}
#else
if (attr.start < int(cursor_pos)
&& int(cursor_pos) <= attr.start + attr.length) {
// we are in the completing mode
// (selecting the right chars from candidates)
rStart = size_t(attr.start);
rLength = size_t(attr.length);
break;
}
#endif
}
}
}
else {
if (rStart == 0 && rLength == preedit_length) {
// we are in the composing mode (typing) as we didn't break above
rStart = cursor_pos;
rLength = 0;
}
@ -1290,9 +1312,9 @@ void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
ps = Painter::preedit_selecting;
}
if (pos == cursor_pos
&& (cursor_pos < rLength && rLength == preedit_length))
if (pos == cursor_pos && rLength == 0) {
ps = Painter::preedit_cursor;
}
// draw one character and update cur_x.
cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);