qui/seqbrowser/ScrollableSequenceBrowser.cpp

   1 #include <QVBoxLayout>
   2
   3 #include "qui/seqbrowser/ScrollableSequenceBrowser.hpp"
   4
   5 ScrollableSequenceBrowser::ScrollableSequenceBrowser(QWidget *parent) :
   6   QWidget(parent),
   7   viewportBar(Qt::Horizontal)
   8 {
   9   // construct central opengl widget
  10   QVBoxLayout *layout = new QVBoxLayout;
  11
  12   layout->addWidget(&sequence_browser);
  13   layout->addWidget(&viewportBar);
  14
  15   connect(&viewportBar, SIGNAL(valueChanged(int)),
  16           this, SLOT(setViewportCenter(int)));
  17   connect(&sequence_browser, SIGNAL(viewportChanged()),
  18           this, SLOT(updateScrollBar()));
  19
  20   setLayout(layout);
  21
  22   // sets range & scale
  23   updateScrollBar();
  24
  25   // enble keyboard input
  26   viewportBar.setFocusPolicy(Qt::StrongFocus);
  27 }
  28
  29 void ScrollableSequenceBrowser::updateScrollBar()
  30 {
  31   thumb = (int)sequence_browser.viewportCenter();
  32   viewportBar.setRange((int)sequence_browser.left(),
  33                        (int)sequence_browser.right());
  34   viewportBar.setValue(thumb);
  35   viewportBar.setPageStep(static_cast<int>(sequence_browser.viewportWidth()));
  36   int step_size = static_cast<int>(sequence_browser.zoom());
  37   step_size = step_size > 1 ? step_size : 1;
  38   viewportBar.setSingleStep(static_cast<int>( step_size ));
  39 }
  40
  41 void ScrollableSequenceBrowser::setViewportCenter(int x)
  42 {
  43   if (x != thumb) {
  44     thumb = x;
  45     sequence_browser.setViewportCenter(thumb);
  46   }
  47 }
  48