qui/seqbrowser/ScrollableSequenceBrowser.cpp

   1 #include <QVBoxLayout>
   2
   3 #include "qui/seqbrowser/ScrollableSequenceBrowser.hpp"
   4
   5 ScrollableSequenceBrowser::ScrollableSequenceBrowser(QWidget *parent) :
   6   QWidget(parent),
   7   sequence_browser(0),
   8   viewportBar(0)
   9 {
  10   QVBoxLayout *layout = new QVBoxLayout(this);
  11   sequence_browser = new SequenceBrowser;
  12   viewportBar = new QScrollBar(Qt::Horizontal);
  13   // construct central opengl widget
  14
  15   layout->addWidget(sequence_browser);
  16   layout->addWidget(viewportBar);
  17
  18   connect(viewportBar, SIGNAL(valueChanged(int)),
  19           this, SLOT(setViewportCenter(int)));
  20   connect(sequence_browser, SIGNAL(viewportChanged()),
  21           this, SLOT(updateScrollBar()));
  22
  23   setLayout(layout);
  24
  25   // sets range & scale
  26   updateScrollBar();
  27
  28   // enble keyboard input
  29   viewportBar->setFocusPolicy(Qt::StrongFocus);
  30 }
  31
  32 void ScrollableSequenceBrowser::updateScrollBar()
  33 {
  34   thumb = (int)sequence_browser->viewportCenter();
  35   viewportBar->setRange((int)sequence_browser->left(),
  36                         (int)sequence_browser->right());
  37   viewportBar->setValue(thumb);
  38   viewportBar->setPageStep(static_cast<int>(sequence_browser->viewportWidth()));
  39   int step_size = static_cast<int>(sequence_browser->zoom());
  40   step_size = step_size > 1 ? step_size : 1;
  41   viewportBar->setSingleStep(static_cast<int>( step_size ));
  42 }
  43
  44 void ScrollableSequenceBrowser::setViewportCenter(int x)
  45 {
  46   if (x != thumb) {
  47     thumb = x;
  48     sequence_browser->setViewportCenter(thumb);
  49   }
  50 }