squawk/ui/utils/textmeter.h

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2022-04-17 11:58:46 +00:00
// Squawk messenger.
// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifndef TEXTMETER_H
#define TEXTMETER_H
#include <list>
#include <set>
#include <QFontMetrics>
#include <QFont>
#include <QSize>
#include <QFontDatabase>
class TextMeter
{
public:
TextMeter();
~TextMeter();
void initializeFonts(const QFont& font);
QSize boundingSize(const QString& text, const QSize& limits) const;
private:
QFontDatabase base;
std::list<QFontMetrics> fonts;
struct Helper {
Helper(int maxWidth);
int width;
int height;
int wordWidth;
int wordHeight;
int delayedSpaceWidth;
int maxWidth;
bool wordBeganWithTheLine;
QString text;
QString word;
QChar lastSpace;
QSize size;
void computeNewLine(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch);
void computeChar(const QChar& ch, const QFontMetrics& metrics);
void computeNewWord();
void beginNewLine();
bool lineOverflow(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch);
};
static bool newLine(const QChar& ch);
static bool newWord(const QChar& ch);
static bool visible(const QChar& ch);
static bool printOnLineBreak(const QChar& ch);
};
#endif // TEXTMETER_H