C++ QAbstractItemView::verticalScrollBar方法代码示例

void TabPage::forward() {
  // remember current scroll position
  BrowseHistoryItem& item = history_.currentItem();
  QAbstractItemView* childView = folderView_->childView();
  item.setScrollPos(childView->verticalScrollBar()->value());

  history_.forward();
  chdir(history_.currentPath(), false);
}

void TabPage::jumpToHistory(int index)
{
  if(index >=0 && index < history_.size()) {
    // remember current scroll position
    BrowseHistoryItem& item = history_.currentItem();
    QAbstractItemView* childView = folderView_->childView();
    item.setScrollPos(childView->verticalScrollBar()->value());

    history_.setCurrentIndex(index);
    chdir(history_.currentPath(), false);
  }
}

void TabPage::chdir(FmPath* newPath, bool addHistory) {
  if(folder_) {
    // we're already in the specified dir
    if(fm_path_equal(newPath, fm_folder_get_path(folder_)))
      return;

    // remember the previous folder path that we have browsed.
    lastFolderPath_ = fm_folder_get_path(folder_);

    if(addHistory) {
      // store current scroll pos in the browse history
      BrowseHistoryItem& item = history_.currentItem();
      QAbstractItemView* childView = folderView_->childView();
      item.setScrollPos(childView->verticalScrollBar()->value());
    }

    // free the previous model
    if(folderModel_) {
      proxyModel_->setSourceModel(NULL);
      folderModel_->unref(); // unref the cached model
      folderModel_ = NULL;
    }

    freeFolder();
  }

  char* disp_name = fm_path_display_basename(newPath);
  title_ = QString::fromUtf8(disp_name);
  Q_EMIT titleChanged(title_);
  g_free(disp_name);

  folder_ = fm_folder_from_path(newPath);
  proxyFilter_->setVirtHidden(folder_);
  if(addHistory) {
    // add current path to browse history
    history_.add(path());
  }
  g_signal_connect(folder_, "start-loading", G_CALLBACK(onFolderStartLoading), this);
  g_signal_connect(folder_, "finish-loading", G_CALLBACK(onFolderFinishLoading), this);
  g_signal_connect(folder_, "error", G_CALLBACK(onFolderError), this);
  g_signal_connect(folder_, "fs-info", G_CALLBACK(onFolderFsInfo), this);
  /* destroy the page when the folder is unmounted or deleted. */
  g_signal_connect(folder_, "removed", G_CALLBACK(onFolderRemoved), this);
  g_signal_connect(folder_, "unmount", G_CALLBACK(onFolderUnmount), this);
  g_signal_connect(folder_, "content-changed", G_CALLBACK(onFolderContentChanged), this);

  folderModel_ = CachedFolderModel::modelFromFolder(folder_);
  proxyModel_->setSourceModel(folderModel_);
  proxyModel_->sort(proxyModel_->sortColumn(), proxyModel_->sortOrder());
  Settings& settings = static_cast<Application*>(qApp)->settings();
  proxyModel_->setFolderFirst(settings.sortFolderFirst());
  proxyModel_->sort(settings.sortColumn(), settings.sortOrder());

  if(fm_folder_is_loaded(folder_)) {
    onFolderStartLoading(folder_, this);
    onFolderFinishLoading(folder_, this);
    onFolderFsInfo(folder_, this);
  }
  else
    onFolderStartLoading(folder_, this);
}

//.........这里部分代码省略.........
  QHBoxLayout *topLayout = new QHBoxLayout(sw);

  // create elevation color bar as image
  elevationImage = new ElevationColorImage( &terrainColor[0], this );
  topLayout->addWidget( elevationImage );

  // all editor widgets will be put into a group box to get a better view
  QGroupBox *editBox = new QGroupBox( tr("Color Selection"), this );

  // put group box in an extra VBox layout to center it vertically
  QVBoxLayout *editAll = new QVBoxLayout;
  editAll->addStretch( 10 );
  editAll->addWidget( editBox );
  editAll->addStretch( 10 );

  topLayout->addLayout( editAll );

  // put all edit widgets (combo box and buttons) in a separate VBox layout
  QVBoxLayout *editLayout = new QVBoxLayout;
  editLayout->setSpacing( editLayout->spacing() * Layout::getIntScaledDensity() );

  QLabel *label = new QLabel( tr("Terrain Level") );
  editLayout->addWidget( label );

  //--------------------------------------------------------------------------
  // The users altitude unit (meters/feed) must be considered during
  // elevation display in the combo box.
  QString unit;

  elevationBox = new QComboBox( this );

#ifdef ANDROID
  QAbstractItemView* listView = elevationBox->view();
  QScrollBar* lvsb = listView->verticalScrollBar();
  lvsb->setStyleSheet( Layout::getCbSbStyle() );
#endif

#ifdef QSCROLLER
  elevationBox->view()->setVerticalScrollMode( QAbstractItemView::ScrollPerPixel );
  QScroller::grabGesture( elevationBox->view()->viewport(), QScroller::LeftMouseButtonGesture );
#endif

#ifdef QTSCROLLER
  elevationBox->view()->setVerticalScrollMode( QAbstractItemView::ScrollPerPixel );
  QtScroller::grabGesture( elevationBox->view()->viewport(), QtScroller::LeftMouseButtonGesture );
#endif

  if( Altitude::getUnit() == Altitude::meters )
    {
      // use unit meter
       unit = "m";

       for( int i = SIZEOF_TERRAIN_COLORS-1; i > 1; i-- )
        {
          pixmap.fill( terrainColor[i] );
          elevationBox->addItem( QIcon( pixmap ), QString(altitudes[i]) + unit );
        }
    }
  else
    {
      // use unit feed
      unit = "ft";

      for( int i = SIZEOF_TERRAIN_COLORS-1; i > 1; i-- )
        {
          int altFeed = static_cast<int>(QString(altitudes[i]).toDouble() * 3.28095);