first attempt
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@ -15,4 +15,6 @@ target_sources(squawk PRIVATE
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resizer.h
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shadowoverlay.cpp
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shadowoverlay.h
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textmeter.cpp
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textmeter.h
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)
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233
ui/utils/textmeter.cpp
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233
ui/utils/textmeter.cpp
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@ -0,0 +1,233 @@
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// Squawk messenger.
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// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "textmeter.h"
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#include <QDebug>
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#include <QApplication>
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TextMeter::TextMeter():
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base(),
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fonts()
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{
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}
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TextMeter::~TextMeter()
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{
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}
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void TextMeter::initializeFonts(const QFont& font)
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{
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fonts.clear();
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QList<QFontDatabase::WritingSystem> supported = base.writingSystems(font.family());
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std::set<QFontDatabase::WritingSystem> sup;
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std::set<QString> added({font.family()});
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for (const QFontDatabase::WritingSystem& system : supported) {
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sup.insert(system);
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}
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fonts.push_back(QFontMetrics(font));
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QString style = base.styleString(font);
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QList<QFontDatabase::WritingSystem> systems = base.writingSystems();
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for (const QFontDatabase::WritingSystem& system : systems) {
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if (sup.count(system) == 0) {
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QStringList families = base.families(system);
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if (!families.empty() && added.count(families.first()) == 0) {
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QString family(families.first());
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QFont nfont = base.font(family, style, font.pointSize());
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if (added.count(nfont.family()) == 0) {
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added.insert(family);
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fonts.push_back(QFontMetrics(nfont));
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qDebug() << "Added font" << nfont.family() << "for" << system;
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}
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}
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}
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}
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}
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QSize TextMeter::boundingSize(const QString& text, const QSize& limits) const
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{
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// QString str("ridiculus mus. Suspendisse potenti. Cras pretium venenatis enim, faucibus accumsan ex");
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// bool first = true;
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// int width = 0;
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// QStringList list = str.split(" ");
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// QFontMetrics m = fonts.front();
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// for (const QString& word : list) {
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// if (first) {
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// first = false;
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// } else {
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// width += m.horizontalAdvance(QChar::Space);
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// }
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// width += m.horizontalAdvance(word);
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// for (const QChar& ch : word) {
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// width += m.horizontalAdvance(ch);
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// }
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// }
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// qDebug() << "together:" << m.horizontalAdvance(str);
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// qDebug() << "apart:" << width;
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// I cant measure or wrap text this way, this simple example shows that even this gives differen result
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// The Qt implementation under it is thousands and thousands lines of code in QTextEngine
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// I simply can't get though it
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if (text.size() == 0) {
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return QSize (0, 0);
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}
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Helper current(limits.width());
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for (const QChar& ch : text) {
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if (newLine(ch)) {
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current.computeNewWord();
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if (current.height == 0) {
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current.height = fonts.front().lineSpacing();
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}
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current.beginNewLine();
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} else if (visible(ch)) {
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bool found = false;
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for (const QFontMetrics& metrics : fonts) {
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if (metrics.inFont(ch)) {
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current.computeChar(ch, metrics);
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found = true;
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break;
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}
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}
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if (!found) {
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current.computeChar(ch, fonts.front());
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}
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}
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}
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current.computeNewWord();
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current.beginNewLine();
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int& height = current.size.rheight();
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if (height > 0) {
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height -= fonts.front().leading();
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}
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return current.size;
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}
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void TextMeter::Helper::computeChar(const QChar& ch, const QFontMetrics& metrics)
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{
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int ha = metrics.horizontalAdvance(ch);
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if (newWord(ch)) {
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if (printOnLineBreak(ch)) {
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if (!lineOverflow(metrics, ha, ch)){
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computeNewWord();
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}
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} else {
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computeNewWord();
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delayedSpaceWidth = ha;
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lastSpace = ch;
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}
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} else {
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lineOverflow(metrics, ha, ch);
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}
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}
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void TextMeter::Helper::computeNewLine(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch)
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{
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if (wordBeganWithTheLine) {
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text = word.chopped(1);
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width = wordWidth - horizontalAdvance;
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height = wordHeight;
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}
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if (width != metrics.horizontalAdvance(text)) {
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qDebug() << "Kerning Error" << width - metrics.horizontalAdvance(text);
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}
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beginNewLine();
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if (wordBeganWithTheLine) {
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word = ch;
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wordWidth = horizontalAdvance;
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wordHeight = metrics.lineSpacing();
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}
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wordBeganWithTheLine = true;
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delayedSpaceWidth = 0;
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lastSpace = QChar::Null;
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}
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void TextMeter::Helper::beginNewLine()
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{
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size.rheight() += height;
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size.rwidth() = qMax(size.width(), width);
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qDebug() << text;
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text = "";
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width = 0;
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height = 0;
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}
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void TextMeter::Helper::computeNewWord()
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{
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width += wordWidth + delayedSpaceWidth;
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height = qMax(height, wordHeight);
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if (lastSpace != QChar::Null) {
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text += lastSpace;
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}
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text += word;
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word = "";
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wordWidth = 0;
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wordHeight = 0;
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delayedSpaceWidth = 0;
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lastSpace = QChar::Null;
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wordBeganWithTheLine = false;
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}
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bool TextMeter::Helper::lineOverflow(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch)
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{
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wordHeight = qMax(wordHeight, metrics.lineSpacing());
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wordWidth += horizontalAdvance;
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word += ch;
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if (width + delayedSpaceWidth + wordWidth > maxWidth) {
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computeNewLine(metrics, horizontalAdvance, ch);
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return true;
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}
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return false;
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}
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bool TextMeter::newLine(const QChar& ch)
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{
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return ch == QChar::LineFeed;
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}
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bool TextMeter::newWord(const QChar& ch)
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{
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return ch.isSpace() || ch.isPunct();
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}
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bool TextMeter::printOnLineBreak(const QChar& ch)
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{
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return ch != QChar::Space;
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}
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bool TextMeter::visible(const QChar& ch)
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{
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return true;
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}
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TextMeter::Helper::Helper(int p_maxWidth):
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width(0),
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height(0),
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wordWidth(0),
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wordHeight(0),
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delayedSpaceWidth(0),
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maxWidth(p_maxWidth),
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wordBeganWithTheLine(true),
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text(""),
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word(""),
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lastSpace(QChar::Null),
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size(0, 0)
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{
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}
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68
ui/utils/textmeter.h
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68
ui/utils/textmeter.h
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@ -0,0 +1,68 @@
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// Squawk messenger.
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// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef TEXTMETER_H
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#define TEXTMETER_H
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#include <list>
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#include <set>
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#include <QFontMetrics>
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#include <QFont>
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#include <QSize>
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#include <QFontDatabase>
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class TextMeter
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{
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public:
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TextMeter();
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~TextMeter();
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void initializeFonts(const QFont& font);
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QSize boundingSize(const QString& text, const QSize& limits) const;
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private:
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QFontDatabase base;
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std::list<QFontMetrics> fonts;
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struct Helper {
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Helper(int maxWidth);
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int width;
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int height;
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int wordWidth;
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int wordHeight;
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int delayedSpaceWidth;
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int maxWidth;
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bool wordBeganWithTheLine;
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QString text;
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QString word;
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QChar lastSpace;
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QSize size;
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void computeNewLine(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch);
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void computeChar(const QChar& ch, const QFontMetrics& metrics);
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void computeNewWord();
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void beginNewLine();
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bool lineOverflow(const QFontMetrics& metrics, int horizontalAdvance, const QChar& ch);
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};
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static bool newLine(const QChar& ch);
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static bool newWord(const QChar& ch);
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static bool visible(const QChar& ch);
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static bool printOnLineBreak(const QChar& ch);
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};
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#endif // TEXTMETER_H
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@ -42,6 +42,7 @@ MessageDelegate::MessageDelegate(QObject* parent):
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nickFont(),
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dateFont(),
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bodyMetrics(bodyFont),
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bodyMeter(),
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nickMetrics(nickFont),
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dateMetrics(dateFont),
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buttonHeight(0),
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@ -123,10 +124,7 @@ void MessageDelegate::paint(QPainter* painter, const QStyleOptionViewItem& optio
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opt.displayAlignment = Qt::AlignRight | Qt::AlignTop;
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}
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QSize bodySize(0, 0);
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if (data.text.size() > 0) {
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bodySize = bodyMetrics.boundingRect(opt.rect, Qt::TextWordWrap, data.text).size();
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}
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QSize bodySize = bodyMeter.boundingSize(data.text, opt.rect.size());
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QRect rect;
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if (ntds) {
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@ -306,7 +304,7 @@ QSize MessageDelegate::sizeHint(const QStyleOptionViewItem& option, const QModel
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Models::FeedItem data = qvariant_cast<Models::FeedItem>(vi);
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QSize messageSize(0, 0);
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if (data.text.size() > 0) {
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messageSize = bodyMetrics.boundingRect(messageRect, Qt::TextWordWrap, data.text).size();
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messageSize = bodyMeter.boundingSize(data.text, messageRect.size());
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messageSize.rheight() += textMargin;
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}
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@ -390,10 +388,13 @@ void MessageDelegate::initializeFonts(const QFont& font)
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dateFont.setPointSize(dateFont.pointSize() * dateFontMultiplier);
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}
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bodyFont.setKerning(false);
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bodyMetrics = QFontMetrics(bodyFont);
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nickMetrics = QFontMetrics(nickFont);
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dateMetrics = QFontMetrics(dateFont);
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bodyMeter.initializeFonts(bodyFont);
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Preview::initializeFont(bodyFont);
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}
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@ -34,6 +34,7 @@
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#include "shared/global.h"
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#include "shared/utils.h"
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#include "shared/pathcheck.h"
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#include "ui/utils/textmeter.h"
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#include "preview.h"
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@ -94,6 +95,7 @@ private:
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QFont nickFont;
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QFont dateFont;
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QFontMetrics bodyMetrics;
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TextMeter bodyMeter;
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QFontMetrics nickMetrics;
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QFontMetrics dateMetrics;
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