Add a spin box widget for timestamp values

[pulseview.git] / pv / widgets / timestampspinbox.cpp

diff --git a/pv/widgets/timestampspinbox.cpp b/pv/widgets/timestampspinbox.cpp
new file mode 100644 (file)
index 0000000..703da6e
--- /dev/null
+++ b/pv/widgets/timestampspinbox.cpp
@@ -0,0 +1,122 @@
+/*
+ * This file is part of the PulseView project.
+ *
+ * Copyright (C) 2015 Jens Steinhauser <jens.steinhauser@gmail.com>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "timestampspinbox.hpp"
+
+#include <QLineEdit>
+#include <QRegExp>
+
+namespace pv {
+namespace widgets {
+
+TimestampSpinBox::TimestampSpinBox(QWidget* parent)
+       : QAbstractSpinBox(parent)
+       , precision_(9)
+       , stepsize_("1e-6")
+{
+       connect(this, SIGNAL(editingFinished()), this, SLOT(on_editingFinished()));
+
+       updateEdit();
+}
+
+void TimestampSpinBox::stepBy(int steps)
+{
+       setValue(value_ + steps * stepsize_);
+}
+
+QAbstractSpinBox::StepEnabled TimestampSpinBox::stepEnabled() const
+{
+       return QAbstractSpinBox::StepUpEnabled | QAbstractSpinBox::StepDownEnabled;
+}
+
+unsigned TimestampSpinBox::precision() const
+{
+       return precision_;
+}
+
+void TimestampSpinBox::setPrecision(unsigned precision)
+{
+       precision_ = precision;
+       updateEdit();
+}
+
+const pv::util::Timestamp& TimestampSpinBox::singleStep() const
+{
+       return stepsize_;
+}
+
+void TimestampSpinBox::setSingleStep(const pv::util::Timestamp& step)
+{
+       stepsize_ = step;
+}
+
+const pv::util::Timestamp& TimestampSpinBox::value() const
+{
+       return value_;
+}
+
+QSize TimestampSpinBox::minimumSizeHint() const
+{
+       const QFontMetrics fm(fontMetrics());
+       const int l = round(value_).str().size() + precision_ + 10;
+       const int w = fm.width(QString(l, '0'));
+       const int h = lineEdit()->minimumSizeHint().height();
+       return QSize(w, h);
+}
+
+void TimestampSpinBox::setValue(const pv::util::Timestamp& val)
+{
+       if (val == value_)
+               return;
+
+       value_ = val;
+       updateEdit();
+       Q_EMIT valueChanged(value_);
+}
+
+void TimestampSpinBox::on_editingFinished()
+{
+       if (!lineEdit()->isModified())
+               return;
+       lineEdit()->setModified(false);
+
+       QRegExp re(R"(\s*([-+]?)\s*([0-9]+\.?[0-9]*).*)");
+
+       if (re.exactMatch(text())) {
+               QStringList captures = re.capturedTexts();
+               captures.removeFirst(); // remove entire match
+               QString str = captures.join("");
+               setValue(pv::util::Timestamp(str.toStdString()));
+       }
+       else {
+               // replace the malformed entered string with the old value
+               updateEdit();
+       }
+}
+
+void TimestampSpinBox::updateEdit()
+{
+       QString newtext = pv::util::format_si_value(
+               value_, "s", 8, precision_);
+       lineEdit()->setText(newtext);
+}
+
+} // widgets
+} // pv