ScaleSignalHandle: Initial implementation

[pulseview.git] / pv / view / signalscalehandle.cpp

diff --git a/pv/view/signalscalehandle.cpp b/pv/view/signalscalehandle.cpp
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+++ b/pv/view/signalscalehandle.cpp
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+/*
+ * This file is part of the PulseView project.
+ *
+ * Copyright (C) 2015 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * 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 <algorithm>
+
+#include <QRadialGradient>
+
+#include "signal.hpp"
+#include "signalscalehandle.hpp"
+#include "tracetreeitemowner.hpp"
+
+using std::max;
+using std::min;
+
+namespace pv {
+namespace view {
+
+SignalScaleHandle::SignalScaleHandle(Signal &owner) :
+       owner_(owner)
+{
+}
+
+bool SignalScaleHandle::enabled() const
+{
+       return selected() || owner_.selected();
+}
+
+void SignalScaleHandle::select(bool select)
+{
+       ViewItem::select(select);
+       owner_.owner()->row_item_appearance_changed(true, true);
+}
+
+void SignalScaleHandle::drag_release()
+{
+       RowItem::drag_release();
+       owner_.scale_handle_released();
+       owner_.owner()->row_item_appearance_changed(true, true);
+}
+
+void SignalScaleHandle::drag_by(const QPoint &delta)
+{
+       owner_.scale_handle_dragged(
+               drag_point_.y() + delta.y() - owner_.get_visual_y());
+}
+
+QPoint SignalScaleHandle::point(const QRect &rect) const
+{
+       return owner_.point(rect) + QPoint(0, owner_.scale_handle_offset());
+}
+
+QRectF SignalScaleHandle::hit_box_rect(const ViewItemPaintParams &pp) const
+{
+       const int text_height = ViewItemPaintParams::text_height();
+       const double x = -pp.pixels_offset() - text_height / 2;
+       const double min_x = pp.left() + text_height;
+       const double max_x = pp.right() - text_height * 2;
+       return QRectF(min(max(x, min_x), max_x),
+               owner_.get_visual_y() + owner_.scale_handle_offset() -
+                       text_height / 2,
+               text_height, text_height);
+}
+
+void SignalScaleHandle::paint_fore(QPainter &p, const ViewItemPaintParams &pp)
+{
+       if (!enabled())
+               return;
+
+       const QRectF r(hit_box_rect(pp));
+       const QPointF c = (r.topLeft() + 2 * r.center()) / 3;
+       QRadialGradient gradient(c, r.width(), c);
+
+       if (selected()) {
+               gradient.setColorAt(0.0, QColor(255, 255, 255));
+               gradient.setColorAt(0.75, QColor(192, 192, 192));
+               gradient.setColorAt(1.0, QColor(128, 128, 128));
+       } else {
+               gradient.setColorAt(0.0, QColor(192, 192, 192));
+               gradient.setColorAt(0.75, QColor(128, 128, 128));
+               gradient.setColorAt(1.0, QColor(128, 128, 128));
+       }
+
+       p.setBrush(QBrush(gradient));
+       p.setPen(QColor(128, 128, 128));
+       p.drawEllipse(r);
+}
+
+} // view
+} // pv