Hyperlink + copy&paste enabled tool tips

src/GUI/popup.cpp

@@ -0,0 +1,162 @@
+#include <QToolTip>
+#include <QStyle>
+#include <QStylePainter>
+#include <QStyleOptionFrame>
+#include <QLabel>
+#include <QMouseEvent>
+#include <QApplication>
+#include <QDesktopWidget>
+#include <QBasicTimer>
+#include "popup.h"
+
+#include <QDebug>
+
+
+class Label : public QLabel
+{
+public:
+	Label(const QString &text, QWidget *parent = 0);
+	~Label();
+
+	bool eventFilter(QObject *o, QEvent *ev);
+	void place(const QPoint &pos, QWidget *w);
+	void deleteAfterTimer();
+	void stopTimer() {_timer.stop();}
+
+	static Label *_instance;
+
+protected:
+	void paintEvent(QPaintEvent *event);
+	void timerEvent(QTimerEvent *event);
+
+private:
+	QBasicTimer _timer;
+};
+
+Label *Label::_instance = 0;
+
+Label::Label(const QString &text, QWidget *parent)
+  : QLabel(text, parent, Qt::ToolTip | Qt::BypassGraphicsProxyWidget)
+{
+	delete _instance;
+	_instance = this;
+
+	setForegroundRole(QPalette::ToolTipText);
+	setBackgroundRole(QPalette::ToolTipBase);
+	setPalette(QToolTip::palette());
+	ensurePolished();
+	setMargin(1 + style()->pixelMetric(QStyle::PM_ToolTipLabelFrameWidth, 0,
+	  this));
+	setFrameStyle(QFrame::NoFrame);
+	setAlignment(Qt::AlignLeft);
+	setIndent(1);
+	setWindowOpacity(style()->styleHint(QStyle::SH_ToolTipLabel_Opacity, 0,
+	  this) / 255.0);
+
+	setTextInteractionFlags(Qt::TextBrowserInteraction);
+	setOpenExternalLinks(true);
+
+	setMouseTracking(true);
+
+	qApp->installEventFilter(this);
+}
+
+Label::~Label()
+{
+	_instance = 0;
+}
+
+void Label::paintEvent(QPaintEvent *event)
+{
+	QStylePainter p(this);
+	QStyleOptionFrame opt;
+	opt.init(this);
+	p.drawPrimitive(QStyle::PE_PanelTipLabel, opt);
+	p.end();
+	QLabel::paintEvent(event);
+}
+
+void Label::timerEvent(QTimerEvent *event)
+{
+	if (event->timerId() == _timer.timerId()) {
+		_timer.stop();
+		deleteLater();
+	}
+}
+
+bool Label::eventFilter(QObject *o, QEvent *ev)
+{
+	Q_UNUSED(o);
+
+	switch (ev->type()) {
+		case QEvent::KeyPress:
+		case QEvent::KeyRelease: {
+			const int key = static_cast<QKeyEvent *>(ev)->key();
+			if (key == Qt::Key_Escape) {
+				deleteLater();
+				return true;
+			}
+			break;
+		}
+		case QEvent::FocusIn:
+		case QEvent::FocusOut:
+		case QEvent::WindowActivate:
+		case QEvent::WindowDeactivate:
+		case QEvent::Close:
+			deleteLater();
+			break;
+		case QEvent::MouseMove: {
+			QRectF r(geometry().adjusted(-5, -20, 5, 20));
+			QPointF p(static_cast<QMouseEvent*>(ev)->screenPos());
+			if (!r.contains(p))
+				deleteAfterTimer();
+			break;
+		}
+		default:
+			break;
+	}
+
+	return false;
+}
+
+void Label::place(const QPoint &pos, QWidget *w)
+{
+	QRect screen = QApplication::desktop()->screenGeometry(w);
+	QPoint p(pos.x() + 2, pos.y() + 16);
+
+	if (p.x() + width() > screen.x() + screen.width())
+		p.rx() -= 4 + width();
+	if (p.y() + height() > screen.y() + screen.height())
+		p.ry() -= 24 + height();
+	if (p.y() < screen.y())
+		p.setY(screen.y());
+	if (p.x() + width() > screen.x() + screen.width())
+		p.setX(screen.x() + screen.width() - width());
+	if (p.x() < screen.x())
+		p.setX(screen.x());
+	if (p.y() + height() > screen.y() + screen.height())
+		p.setY(screen.y() + screen.height() - height());
+
+	this->move(p);
+}
+
+void Label::deleteAfterTimer()
+{
+	if (!_timer.isActive())
+		_timer.start(300, this);
+}
+
+
+void Popup::show(const QPoint &pos, const QString &text, QWidget *w)
+{
+	if (Label::_instance) {
+		Label::_instance->stopTimer();
+		Label::_instance->setText(text);
+		Label::_instance->resize(Label::_instance->sizeHint());
+	} else {
+		Label::_instance = new Label(text);
+		Label::_instance->showNormal();
+	}
+
+	Label::_instance->place(pos, w);
+}