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#include "kristalltextbrowser.hpp"
#include "kristall.hpp"
#include <QtGlobal>
#include <QMouseEvent>
#include <QScroller>
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
#include <QTouchDevice>
#else
#include <QInputDevice>
#endif
#include <QRegularExpression>
#include <QLineEdit>
#include <QApplication>
const Qt::CursorShape KristallTextBrowser::NORMAL_CURSOR = Qt::IBeamCursor;
KristallTextBrowser::KristallTextBrowser(QWidget *parent) :
QTextBrowser(parent)
{
connect(this, &QTextBrowser::anchorClicked, this, &KristallTextBrowser::on_anchorClicked);
// Enable touch scrolling on touchscreen devices
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
for (int i = 0; i < QTouchDevice::devices().length(); ++i)
{
if (QTouchDevice::devices()[i]->type() == QTouchDevice::TouchScreen)
{
this->viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
QScroller::grabGesture(this, QScroller::LeftMouseButtonGesture);
break;
}
}
#else
for (auto &device: QInputDevice::devices())
{
if (device->type() == QInputDevice::DeviceType::TouchScreen)
{
this->viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
QScroller::grabGesture(this, QScroller::LeftMouseButtonGesture);
break;
}
}
#endif
}
void KristallTextBrowser::mouseReleaseEvent(QMouseEvent *event)
{
if(event->button() == Qt::MiddleButton) {
// Deselect any selection. Otherwise the click won't register.
setTextCursor(cursorForPosition(event->pos()));
// Fake a middle-click event here
QMouseEvent fake_event {
event->type(),
event->localPos(),
Qt::LeftButton,
event->buttons(),
event->modifiers()
};
this->signal_new_tab = true;
QTextBrowser::mouseReleaseEvent(&fake_event);
} else {
this->signal_new_tab = event->modifiers().testFlag(Qt::ControlModifier);
QTextBrowser::mouseReleaseEvent(event);
}
}
void KristallTextBrowser::on_anchorClicked(const QUrl &url)
{
emit this->anchorClicked(url, this->signal_new_tab);
}
void KristallTextBrowser::mouseMoveEvent(QMouseEvent *event)
{
QTextBrowser::mouseMoveEvent(event);
this->updateCursor();
}
void KristallTextBrowser::setDefaultCursor(const QCursor &cur)
{
this->wanted_cursor = cur;
this->updateCursor();
}
void KristallTextBrowser::focusInEvent(QFocusEvent *event)
{
QTextBrowser::focusInEvent(event);
this->updateCursor();
}
void KristallTextBrowser::updateCursor()
{
// This slight hack allows us to set the "default" cursor,
// (i.e when not hovering over links) We need to do this
// because QTextBrowser for some reason resets viewport cursor
// to ArrowCursor after we hover over links
const QCursor& cur = this->viewport()->cursor();
if (cur.shape() != this->wanted_cursor.shape() &&
cur.shape() != Qt::PointingHandCursor)
{
this->viewport()->setCursor(wanted_cursor);
}
}
void KristallTextBrowser::keyPressEvent(QKeyEvent *event)
{
if(event->modifiers() == Qt::ControlModifier &&
event->key() == Qt::Key_C) {
this->betterCopy();
} else {
QTextBrowser::keyPressEvent(event);
}
}
void KristallTextBrowser::keyReleaseEvent(QKeyEvent *event)
{
if(event->modifiers() == Qt::ControlModifier &&
event->key() == Qt::Key_C) {
// Eat the event
} else {
QTextBrowser::keyReleaseEvent(event);
}
}
void KristallTextBrowser::betterCopy()
{
// Our own implementation of a copy. All we need to do is get the
// selected text, adjust it if needed, and copy it.
//
// The main adjustment we make here is stripping "fancy" quotes from the text,
// as these quotes are usually an annoyance when copying text.
//
// There is a little trick here though: if a user selects a piece of text
// which consists only of whitespace and fancy quotes
// the fancy quotes will be included in the copy.
//
// In all other cases the quotes will be replaced. This can be said to be
// a usability feature for the few people that may want to actually copy
// the quotes themselves.
QTextCursor cursor = QTextBrowser::textCursor();
QString text = cursor.selectedText();
if (text.isEmpty()) return;
// Check if text only consists of fancy quotes:
static const QRegularExpression REGEX_ONLY_QUOTES(R"(^[\s“”‘’]+$)",
QRegularExpression::CaseInsensitiveOption);
if (text.contains(REGEX_ONLY_QUOTES))
{
// Copy the original text.
qApp->clipboard()->setText(text);
return;
}
// Replace fancy quotes
static const QRegularExpression REGEX_QUOTES_D("(“|”)"), REGEX_QUOTES_S("(‘|’)");
text.replace(REGEX_QUOTES_D, "\"").replace(REGEX_QUOTES_S, "'");
// From docs:
// "If the selection obtained from an editor spans a line break, the text will
// contain a Unicode U+2029 paragraph separator character instead of a newline \n character"
// Hence, we replace with \r\n on Win$hit, and \n on all other platforms
#ifdef Q_OS_WIN32
text.replace(QChar(0x2029), "\r\n");
#else
text.replace(QChar(0x2029), "\n");
#endif
qApp->clipboard()->setText(text);
}
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