text.cpp

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/*
    Copyright © 2014-2019 by The qTox Project Contributors
 
    This file is part of qTox, a Qt-based graphical interface for Tox.
 
    qTox is libre 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.
 
    qTox 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 qTox.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "text.h"
#include "../documentcache.h"
 
#include <QAbstractTextDocumentLayout>
#include <QApplication>
#include <QDebug>
#include <QDesktopServices>
#include <QFontMetrics>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QPalette>
#include <QTextBlock>
#include <QTextFragment>
 
Text::Text(const QString& txt, const QFont& font, bool enableElide, const QString& rwText,
           const TextType& type, const QColor& custom)
    : rawText(rwText)
    , elide(enableElide)
    , defFont(font)
    , defStyleSheet(Style::getStylesheet(QStringLiteral("chatArea/innerStyle.css"), font))
    , textType(type)
    , customColor(custom)
{
    color = textColor();
    setText(txt);
    setAcceptedMouseButtons(Qt::LeftButton);
    setAcceptHoverEvents(true);
}
 
Text::~Text()
{
    if (doc)
        DocumentCache::getInstance().push(doc);
}
 
void Text::setText(const QString& txt)
{
    text = txt;
    dirty = true;
}
 
void Text::selectText(const QString& txt, const std::pair<int, int>& point)
{
    regenerate();
 
    if (!doc) {
        return;
    }
 
    auto cursor = doc->find(txt, point.first);
 
    selectText(cursor, point);
}
 
void Text::selectText(const QRegularExpression &exp, const std::pair<int, int>& point)
{
    regenerate();
 
    if (!doc) {
        return;
    }
 
    auto cursor = doc->find(exp, point.first);
 
    selectText(cursor, point);
}
 
void Text::deselectText()
{
    dirty = true;
    regenerate();
    update();
}
 
void Text::setWidth(qreal w)
{
    width = w;
    dirty = true;
 
    regenerate();
}
 
void Text::selectionMouseMove(QPointF scenePos)
{
    if (!doc)
        return;
 
    int cur = cursorFromPos(scenePos);
    if (cur >= 0) {
        selectionEnd = cur;
        selectedText = extractSanitizedText(getSelectionStart(), getSelectionEnd());
    }
 
    update();
}
 
void Text::selectionStarted(QPointF scenePos)
{
    int cur = cursorFromPos(scenePos);
    if (cur >= 0) {
        selectionEnd = cur;
        selectionAnchor = cur;
    }
}
 
void Text::selectionCleared()
{
    selectedText.clear();
    selectedText.squeeze();
 
    // Do not reset selectionAnchor!
    selectionEnd = -1;
 
    update();
}
 
void Text::selectionDoubleClick(QPointF scenePos)
{
    if (!doc)
        return;
 
    int cur = cursorFromPos(scenePos);
 
    if (cur >= 0) {
        QTextCursor cursor(doc);
        cursor.setPosition(cur);
        cursor.select(QTextCursor::WordUnderCursor);
 
        selectionAnchor = cursor.selectionStart();
        selectionEnd = cursor.selectionEnd();
 
        selectedText = extractSanitizedText(getSelectionStart(), getSelectionEnd());
    }
 
    update();
}
 
void Text::selectionTripleClick(QPointF scenePos)
{
    if (!doc)
        return;
 
    int cur = cursorFromPos(scenePos);
 
    if (cur >= 0) {
        QTextCursor cursor(doc);
        cursor.setPosition(cur);
        cursor.select(QTextCursor::BlockUnderCursor);
 
        selectionAnchor = cursor.selectionStart();
        selectionEnd = cursor.selectionEnd();
 
        if (cursor.block().isValid() && cursor.block().blockNumber() != 0)
            selectionAnchor++;
 
        selectedText = extractSanitizedText(getSelectionStart(), getSelectionEnd());
    }
 
    update();
}
 
void Text::selectionFocusChanged(bool focusIn)
{
    selectionHasFocus = focusIn;
    update();
}
 
bool Text::isOverSelection(QPointF scenePos) const
{
    int cur = cursorFromPos(scenePos);
    if (getSelectionStart() < cur && getSelectionEnd() >= cur)
        return true;
 
    return false;
}
 
QString Text::getSelectedText() const
{
    return selectedText;
}
 
void Text::fontChanged(const QFont& font)
{
    defFont = font;
}
 
QRectF Text::boundingRect() const
{
    return QRectF(QPointF(0, 0), size);
}
 
void Text::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
    Q_UNUSED(option)
    Q_UNUSED(widget)
 
    if (!doc)
        return;
 
    painter->setClipRect(boundingRect());
 
    // draw selection
    QAbstractTextDocumentLayout::PaintContext ctx;
    QAbstractTextDocumentLayout::Selection sel;
 
    if (hasSelection()) {
        sel.cursor = QTextCursor(doc);
        sel.cursor.setPosition(getSelectionStart());
        sel.cursor.setPosition(getSelectionEnd(), QTextCursor::KeepAnchor);
    }
 
    const QColor selectionColor = Style::getColor(Style::SelectText);
    sel.format.setBackground(selectionColor.lighter(selectionHasFocus ? 100 : 160));
    sel.format.setForeground(selectionHasFocus ? Qt::white : Qt::black);
 
    ctx.selections.append(sel);
    ctx.palette.setColor(QPalette::Text, color);
 
    // draw text
    doc->documentLayout()->draw(painter, ctx);
}
 
void Text::visibilityChanged(bool visible)
{
    keepInMemory = visible;
 
    regenerate();
    update();
}
 
void Text::reloadTheme()
{
    defStyleSheet = Style::getStylesheet(QStringLiteral("chatArea/innerStyle.css"), defFont);
    color = textColor();
    dirty = true;
    regenerate();
    update();
}
 
qreal Text::getAscent() const
{
    return ascent;
}
 
void Text::mousePressEvent(QGraphicsSceneMouseEvent* event)
{
    if (event->button() == Qt::LeftButton)
        event->accept(); // grabber
}
 
void Text::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
{
    if (!doc)
        return;
 
    QString anchor = doc->documentLayout()->anchorAt(event->pos());
 
    // open anchor in browser
    if (!anchor.isEmpty())
        QDesktopServices::openUrl(anchor);
}
 
void Text::hoverMoveEvent(QGraphicsSceneHoverEvent* event)
{
    if (!doc)
        return;
 
    QString anchor = doc->documentLayout()->anchorAt(event->pos());
 
    if (anchor.isEmpty())
        setCursor(Qt::IBeamCursor);
    else
        setCursor(Qt::PointingHandCursor);
 
    // tooltip
    setToolTip(extractImgTooltip(cursorFromPos(event->scenePos(), false)));
}
 
QString Text::getText() const
{
    return rawText;
}
 
QString Text::getLinkAt(QPointF scenePos) const
{
    QTextCursor cursor(doc);
    cursor.setPosition(cursorFromPos(scenePos));
    return cursor.charFormat().anchorHref();
}
 
void Text::regenerate()
{
    if (!doc) {
        doc = DocumentCache::getInstance().pop();
        dirty = true;
    }
 
    if (dirty) {
        doc->setDefaultFont(defFont);
 
        if (elide) {
            QFontMetrics metrics = QFontMetrics(defFont);
            QString elidedText = metrics.elidedText(text, Qt::ElideRight, qRound(width));
 
            doc->setPlainText(elidedText);
        } else {
            doc->setDefaultStyleSheet(defStyleSheet);
            doc->setHtml(text);
        }
 
        // wrap mode
        QTextOption opt;
        opt.setWrapMode(elide ? QTextOption::NoWrap : QTextOption::WrapAtWordBoundaryOrAnywhere);
        doc->setDefaultTextOption(opt);
 
        // width
        doc->setTextWidth(width);
        doc->documentLayout()->update();
 
        // update ascent
        if (doc->firstBlock().layout()->lineCount() > 0)
            ascent = doc->firstBlock().layout()->lineAt(0).ascent();
 
        // let the scene know about our change in size
        if (size != idealSize())
            prepareGeometryChange();
 
        // get the new width and height
        size = idealSize();
 
        dirty = false;
    }
 
    // if we are not visible -> free mem
    if (!keepInMemory)
        freeResources();
}
 
void Text::freeResources()
{
    DocumentCache::getInstance().push(doc);
    doc = nullptr;
}
 
QSizeF Text::idealSize()
{
    if (doc)
        return doc->size();
 
    return size;
}
 
int Text::cursorFromPos(QPointF scenePos, bool fuzzy) const
{
    if (doc)
        return doc->documentLayout()->hitTest(mapFromScene(scenePos),
                                              fuzzy ? Qt::FuzzyHit : Qt::ExactHit);
 
    return -1;
}
 
int Text::getSelectionEnd() const
{
    return qMax(selectionAnchor, selectionEnd);
}
 
int Text::getSelectionStart() const
{
    return qMin(selectionAnchor, selectionEnd);
}
 
bool Text::hasSelection() const
{
    return selectionEnd >= 0;
}
 
QString Text::extractSanitizedText(int from, int to) const
{
    if (!doc)
        return "";
 
    QString txt;
 
    QTextBlock begin = doc->findBlock(from);
    QTextBlock end = doc->findBlock(to);
    for (QTextBlock block = begin; block != end.next() && block.isValid(); block = block.next()) {
        for (QTextBlock::Iterator itr = block.begin(); itr != block.end(); ++itr) {
            int pos = itr.fragment().position(); // fragment position -> position of the first
                                                 // character in the fragment
 
            if (itr.fragment().charFormat().isImageFormat()) {
                QTextImageFormat imgFmt = itr.fragment().charFormat().toImageFormat();
                QString key = imgFmt.name(); // img key (eg. key::D for :D)
                QString rune = key.mid(4);
 
                if (pos >= from && pos < to) {
                    txt += rune;
                    ++pos;
                }
            } else {
                for (QChar c : itr.fragment().text()) {
                    if (pos >= from && pos < to)
                        txt += c;
 
                    ++pos;
                }
            }
        }
 
        txt += '\n';
    }
 
    txt.chop(1);
 
    return txt;
}
 
QString Text::extractImgTooltip(int pos) const
{
    for (QTextBlock::Iterator itr = doc->firstBlock().begin(); itr != doc->firstBlock().end(); ++itr) {
        if (itr.fragment().contains(pos) && itr.fragment().charFormat().isImageFormat()) {
            QTextImageFormat imgFmt = itr.fragment().charFormat().toImageFormat();
            return imgFmt.toolTip();
        }
    }
 
    return QString();
}
 
void Text::selectText(QTextCursor& cursor, const std::pair<int, int>& point)
{
    if (!cursor.isNull()) {
        cursor.beginEditBlock();
        cursor.setPosition(point.first);
        cursor.setPosition(point.first + point.second, QTextCursor::KeepAnchor);
        cursor.endEditBlock();
 
        QTextCharFormat format;
        format.setBackground(QBrush(Style::getColor(Style::SearchHighlighted)));
        cursor.mergeCharFormat(format);
 
        regenerate();
        update();
    }
}
 
QColor Text::textColor() const
{
    QColor c = Style::getColor(Style::MainText);
    if (textType == ACTION) {
        c = Style::getColor(Style::Action);
    } else if (textType == CUSTOM) {
        c = customColor;
    }
 
    return c;
}