ScaleSignalHandle: Initial implementation

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

diff --git a/pv/view/signalscalehandle.hpp b/pv/view/signalscalehandle.hpp
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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
+ */
+
+#ifndef PULSEVIEW_PV_VIEW_SIGNALSCALEHANDLE_HPP
+#define PULSEVIEW_PV_VIEW_SIGNALSCALEHANDLE_HPP
+
+#include "rowitem.hpp"
+
+namespace pv {
+namespace view {
+
+class Signal;
+
+/**
+ * A row item owned by a @c Signal that implements the v-scale adjustment grab
+ * handle.
+ */
+class SignalScaleHandle : public RowItem
+{
+       Q_OBJECT
+public:
+       /**
+        * Constructor
+        */
+       explicit SignalScaleHandle(Signal &owner);
+
+public:
+       /**
+        * Returns true if the parent item is enabled.
+        */
+       bool enabled() const;
+
+       /**
+        * Selects or deselects the signal.
+        */
+       void select(bool select = true);
+
+       /**
+        * Sets this item into the un-dragged state.
+        */
+       void drag_release();
+
+       /**
+        * Drags the item to a delta relative to the drag point.
+        * @param delta the offset from the drag point.
+        */
+       void drag_by(const QPoint &delta);
+
+       /**
+        * Get the drag point.
+        * @param rect the rectangle of the widget area.
+        */
+       QPoint point(const QRect &rect) const;
+
+       /**
+        * Computes the outline rectangle of the viewport hit-box.
+        * @param rect the rectangle of the viewport area.
+        * @return Returns the rectangle of the hit-box.
+        */
+       QRectF hit_box_rect(const ViewItemPaintParams &pp) const;
+
+       /**
+        * Paints the foreground layer of the item with a QPainter
+        * @param p the QPainter to paint into.
+        * @param pp the painting parameters object to paint with.
+        **/
+       void paint_fore(QPainter &p, const ViewItemPaintParams &pp);
+
+private:
+       Signal &owner_;
+};
+
+} // namespace view
+} // namespace pv
+
+#endif // PULSEVIEW_PV_VIEW_SIGNALSCALEHANDLE_HPP