Method UpdateTextClipping

libraries/ZWidget/src/widgets/lineedit/lineedit.cpp:817–870

}

void LineEdit::UpdateTextClipping()
{
	Canvas* canvas = GetCanvas();

	Size text_size = GetVisualTextSize(canvas, clip_start_offset, (int)text.size() - clip_start_offset);

	if (cursor_pos < clip_start_offset)
		clip_start_offset = cursor_pos;

	Rect cursor_rect = GetCursorRect();

	UTF8Reader utf8_reader(text.data(), text.length());
	double width = GetWidth();
	while (cursor_rect.x + cursor_rect.width > width)
	{
		utf8_reader.set_position(clip_start_offset);
		utf8_reader.next();
		clip_start_offset = (int)utf8_reader.position();
		if (clip_start_offset == text.size())
			break;
		cursor_rect = GetCursorRect();
	}

	// Get number of chars of current text fitting in the lineedit.
	int search_upper = (int)text.size();
	int search_lower = clip_start_offset;

	while (true)
	{
		int midpoint = (search_lower + search_upper) / 2;

		utf8_reader.set_position(midpoint);
		utf8_reader.move_to_leadbyte();
		if (midpoint != utf8_reader.position())
			utf8_reader.next();
		midpoint = (int)utf8_reader.position();

		if (midpoint == search_lower || midpoint == search_upper)
			break;

		Size midpoint_size = GetVisualTextSize(canvas, clip_start_offset, midpoint - clip_start_offset);

		if (width < midpoint_size.width)
			search_upper = midpoint;
		else
			search_lower = midpoint;
	}
	clip_end_offset = search_upper;

	if (cursor_rect.x < 0.0)
	{
		clip_start_offset = cursor_pos;
	}
}

Rect LineEdit::GetCursorRect()
{