pv/view/signalscalehandle.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2015 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <algorithm>
  22
  23 #include <QRadialGradient>
  24
  25 #include "signal.hpp"
  26 #include "signalscalehandle.hpp"
  27 #include "tracetreeitemowner.hpp"
  28
  29 using std::max;
  30 using std::min;
  31
  32 namespace pv {
  33 namespace view {
  34
  35 SignalScaleHandle::SignalScaleHandle(Signal &owner) :
  36         owner_(owner)
  37 {
  38 }
  39
  40 bool SignalScaleHandle::enabled() const
  41 {
  42         return selected() || owner_.selected();
  43 }
  44
  45 void SignalScaleHandle::select(bool select)
  46 {
  47         ViewItem::select(select);
  48         owner_.owner()->row_item_appearance_changed(true, true);
  49 }
  50
  51 void SignalScaleHandle::drag_release()
  52 {
  53         RowItem::drag_release();
  54         owner_.scale_handle_released();
  55         owner_.owner()->row_item_appearance_changed(true, true);
  56 }
  57
  58 void SignalScaleHandle::drag_by(const QPoint &delta)
  59 {
  60         owner_.scale_handle_dragged(
  61                 drag_point_.y() + delta.y() - owner_.get_visual_y());
  62         owner_.owner()->row_item_appearance_changed(true, true);
  63 }
  64
  65 QPoint SignalScaleHandle::point(const QRect &rect) const
  66 {
  67         return owner_.point(rect) + QPoint(0, owner_.scale_handle_offset());
  68 }
  69
  70 QRectF SignalScaleHandle::hit_box_rect(const ViewItemPaintParams &pp) const
  71 {
  72         const int text_height = ViewItemPaintParams::text_height();
  73         const double x = -pp.pixels_offset() - text_height / 2;
  74         const double min_x = pp.left() + text_height;
  75         const double max_x = pp.right() - text_height * 2;
  76         return QRectF(min(max(x, min_x), max_x),
  77                 owner_.get_visual_y() + owner_.scale_handle_offset() -
  78                         text_height / 2,
  79                 text_height, text_height);
  80 }
  81
  82 void SignalScaleHandle::paint_fore(QPainter &p, const ViewItemPaintParams &pp)
  83 {
  84         if (!enabled())
  85                 return;
  86
  87         const QRectF r(hit_box_rect(pp));
  88         const QPointF c = (r.topLeft() + 2 * r.center()) / 3;
  89         QRadialGradient gradient(c, r.width(), c);
  90
  91         if (selected()) {
  92                 gradient.setColorAt(0.0, QColor(255, 255, 255));
  93                 gradient.setColorAt(0.75, QColor(192, 192, 192));
  94                 gradient.setColorAt(1.0, QColor(128, 128, 128));
  95         } else {
  96                 gradient.setColorAt(0.0, QColor(192, 192, 192));
  97                 gradient.setColorAt(0.75, QColor(128, 128, 128));
  98                 gradient.setColorAt(1.0, QColor(128, 128, 128));
  99         }
 100
 101         p.setBrush(QBrush(gradient));
 102         p.setPen(QColor(128, 128, 128));
 103         p.drawEllipse(r);
 104 }
 105
 106 } // view
 107 } // pv