C++ enabled函数代码示例

 BugzillaModule::BugzillaModule()
 {
   ADD_INTERFACE_IMPL(BugzillaNoteAddin);
   ADD_INTERFACE_IMPL(BugzillaPreferencesFactory);
   enabled(false);
 }

void QgsDecorationNorthArrow::render( const QgsMapSettings &mapSettings, QgsRenderContext &context )
{
  if ( !enabled() )
    return;

  double maxLength = mSize * mapSettings.outputDpi() / 25.4;
  QSvgRenderer svg;

  const QByteArray &svgContent = QgsApplication::svgCache()->svgContent( svgPath(), maxLength, mColor, mOutlineColor, 1.0, 1.0 );
  svg.load( svgContent );

  if ( svg.isValid() )
  {
    QSize size( maxLength, maxLength );
    QRectF viewBox = svg.viewBoxF();
    if ( viewBox.height() > viewBox.width() )
    {
      size.setWidth( maxLength * viewBox.width() / viewBox.height() );
    }
    else
    {
      size.setHeight( maxLength * viewBox.height() / viewBox.width() );
    }

    double centerXDouble = size.width() / 2.0;
    double centerYDouble = size.height() / 2.0;

    //save the current canvas rotation
    context.painter()->save();
    //
    //work out how to shift the image so that it rotates
    //           properly about its center
    //(x cos a + y sin a - x, -x sin a + y cos a - y)
    //
    // could move this call to somewhere else so that it is only
    // called when the projection or map extent changes
    if ( mAutomatic )
    {
      try
      {
        mRotationInt = QgsBearingUtils:: bearingTrueNorth( mapSettings.destinationCrs(), mapSettings.transformContext(), context.extent().center() );
      }
      catch ( QgsException & )
      {
        mRotationInt = 0.0;
      }
      mRotationInt += mapSettings.rotation();
    }

    double radiansDouble = mRotationInt * M_PI / 180.0;
    int xShift = static_cast<int>( (
                                     ( centerXDouble * std::cos( radiansDouble ) ) +
                                     ( centerYDouble * std::sin( radiansDouble ) )
                                   ) - centerXDouble );
    int yShift = static_cast<int>( (
                                     ( -centerXDouble * std::sin( radiansDouble ) ) +
                                     ( centerYDouble * std::cos( radiansDouble ) )
                                   ) - centerYDouble );
    // need width/height of paint device
    int deviceHeight = context.painter()->device()->height();
    int deviceWidth = context.painter()->device()->width();

    // Set  margin according to selected units
    int xOffset = 0;
    int yOffset = 0;
    switch ( mMarginUnit )
    {
      case QgsUnitTypes::RenderMillimeters:
      {
        int pixelsInchX = context.painter()->device()->logicalDpiX();
        int pixelsInchY = context.painter()->device()->logicalDpiY();
        xOffset = pixelsInchX * INCHES_TO_MM * mMarginHorizontal;
        yOffset = pixelsInchY * INCHES_TO_MM * mMarginVertical;
        break;
      }

      case QgsUnitTypes::RenderPixels:
        xOffset = mMarginHorizontal - 5; // Minus 5 to shift tight into corner
        yOffset = mMarginVertical - 5;
        break;

      case QgsUnitTypes::RenderPercentage:
        xOffset = ( ( deviceWidth - size.width() ) / 100. ) * mMarginHorizontal;
        yOffset = ( ( deviceHeight - size.width() ) / 100. ) * mMarginVertical;
        break;
      case QgsUnitTypes::RenderMapUnits:
      case QgsUnitTypes::RenderPoints:
      case QgsUnitTypes::RenderInches:
      case QgsUnitTypes::RenderUnknownUnit:
      case QgsUnitTypes::RenderMetersInMapUnits:
        break;
    }
    //Determine placement of label from form combo box
    switch ( mPlacement )
    {
      case BottomLeft:
        context.painter()->translate( xOffset, deviceHeight - yOffset - maxLength + ( maxLength - size.height() ) / 2 );
        break;
      case TopLeft:
        context.painter()->translate( xOffset, yOffset );
//.........这里部分代码省略.........

 void setCount(const Counter counter) {
   if (enabled()) {
     mCount = counter;
     mHasCount = true;
   }
 }

void LayerThicknessVariation::updateEnabled()
{
    emit enabledChanged(enabled());
}

 bool is_enabled() const { 
     data::read enabled(m_enabled);
     return enabled.use(); 
 }

 ~binding () {
   kassert (!enabled ());
 }

         void on_create( const value_type& v ) {
            if( !enabled() ) return;
            auto& head = _stack.back();

            head.new_ids.insert( v.id );
         }

void
OfflineCollectorPlugin::update (
	int	 command,
	ClassAd	&ad )
{

	dprintf (
		D_FULLDEBUG,
		"In OfflineCollectorPlugin::update ( %d )\n",
		command );

	/* bail out if the plug-in is not enabled */
	if ( !enabled () ) {
		return;
	}

	/* make sure the command is relevant to us */
	if ( UPDATE_STARTD_AD_WITH_ACK != command &&
		 UPDATE_STARTD_AD != command &&
		 MERGE_STARTD_AD != command ) {
		 return;
	}

	MyString s;
	const char *key = makeOfflineKey(ad,s);
	if (!key) return;

	/* report whether this ad is "off-line" or not and update
	   the ad accordingly. */		
	int offline  = FALSE,
		lifetime = 0;

	bool offline_explicit = false;
	if( ad.EvalBool( ATTR_OFFLINE, NULL, offline ) ) {
		offline_explicit = true;
	}

	if ( MERGE_STARTD_AD == command ) {
		mergeClassAd( ad, key );
		return;
	}

	// Rewrite the ad if it is going offline
	if ( UPDATE_STARTD_AD_WITH_ACK == command && !offline_explicit ) {

		/* set the off-line state of the machine */
		offline = TRUE;

		/* get the off-line expiry time (default to INT_MAX) */
		lifetime = param_integer ( 
			"OFFLINE_EXPIRE_ADS_AFTER",
			INT_MAX );

		/* reset any values in the ad that may interfere with
		a match in the future */

		/* Reset Condor state */
		ad.Assign ( ATTR_STATE, state_to_string ( unclaimed_state ) );
		ad.Assign ( ATTR_ACTIVITY, activity_to_string ( idle_act ) );
		ad.Assign ( ATTR_ENTERED_CURRENT_STATE, 0 );
		ad.Assign ( ATTR_ENTERED_CURRENT_ACTIVITY, 0 );

		/* Set the heart-beat time */
		int now = static_cast<int> ( time ( NULL ) );
		ad.Assign ( ATTR_MY_CURRENT_TIME, now );
		ad.Assign ( ATTR_LAST_HEARD_FROM, now );

		/* Reset machine load */
		ad.Assign ( ATTR_LOAD_AVG, 0.0 );
		ad.Assign ( ATTR_CONDOR_LOAD_AVG, 0.0 );		
		ad.Assign ( ATTR_TOTAL_LOAD_AVG, 0.0 );
		ad.Assign ( ATTR_TOTAL_CONDOR_LOAD_AVG, 0.0 );
		
		/* Reset CPU load */
		ad.Assign ( ATTR_CPU_IS_BUSY, false );
		ad.Assign ( ATTR_CPU_BUSY_TIME, 0 );

		/* Reset keyboard and mouse times */
		ad.Assign ( ATTR_KEYBOARD_IDLE, INT_MAX );
		ad.Assign ( ATTR_CONSOLE_IDLE, INT_MAX );		

		/* any others? */


		dprintf ( 
			D_FULLDEBUG, 
			"Machine ad lifetime: %d\n",
			lifetime );

			/* record the new values as specified above */
		ad.Assign ( ATTR_OFFLINE, (bool)offline );
		if ( lifetime > 0 ) {
			ad.Assign ( ATTR_CLASSAD_LIFETIME, lifetime );
		}
	}

	/* if it is off-line then add it to the list; otherwise,
	   remove it. */
	if ( offline > 0 ) {
		persistentStoreAd(key,ad);
//.........这里部分代码省略.........

         /**
          *  This method works similar to git squash, it merges the change set from the two most
          *  recent revision numbers into one revision number (reducing the head revision number)
          *
          *  This method does not change the state of the index, only the state of the undo buffer.
          */
         void squash()
         {
            if( !enabled() ) return;
            if( _stack.size() == 1 ) {
               _stack.pop_front();
               return;
            }

            auto& state = _stack.back();
            auto& prev_state = _stack[_stack.size()-2];

            // An object's relationship to a state can be:
            // in new_ids            : new
            // in old_values (was=X) : upd(was=X)
            // in removed (was=X)    : del(was=X)
            // not in any of above   : nop
            //
            // When merging A=prev_state and B=state we have a 4x4 matrix of all possibilities:
            //
            //                   |--------------------- B ----------------------|
            //
            //                +------------+------------+------------+------------+
            //                | new        | upd(was=Y) | del(was=Y) | nop        |
            //   +------------+------------+------------+------------+------------+
            // / | new        | N/A        | new       A| nop       C| new       A|
            // | +------------+------------+------------+------------+------------+
            // | | upd(was=X) | N/A        | upd(was=X)A| del(was=X)C| upd(was=X)A|
            // A +------------+------------+------------+------------+------------+
            // | | del(was=X) | N/A        | N/A        | N/A        | del(was=X)A|
            // | +------------+------------+------------+------------+------------+
            // \ | nop        | new       B| upd(was=Y)B| del(was=Y)B| nop      AB|
            //   +------------+------------+------------+------------+------------+
            //
            // Each entry was composed by labelling what should occur in the given case.
            //
            // Type A means the composition of states contains the same entry as the first of the two merged states for that object.
            // Type B means the composition of states contains the same entry as the second of the two merged states for that object.
            // Type C means the composition of states contains an entry different from either of the merged states for that object.
            // Type N/A means the composition of states violates causal timing.
            // Type AB means both type A and type B simultaneously.
            //
            // The merge() operation is defined as modifying prev_state in-place to be the state object which represents the composition of
            // state A and B.
            //
            // Type A (and AB) can be implemented as a no-op; prev_state already contains the correct value for the merged state.
            // Type B (and AB) can be implemented by copying from state to prev_state.
            // Type C needs special case-by-case logic.
            // Type N/A can be ignored or assert(false) as it can only occur if prev_state and state have illegal values
            // (a serious logic error which should never happen).
            //

            // We can only be outside type A/AB (the nop path) if B is not nop, so it suffices to iterate through B's three containers.

            for( const auto& item : state.old_values )
            {
               if( prev_state.new_ids.find( item.second.id ) != prev_state.new_ids.end() )
               {
                  // new+upd -> new, type A
                  continue;
               }
               if( prev_state.old_values.find( item.second.id ) != prev_state.old_values.end() )
               {
                  // upd(was=X) + upd(was=Y) -> upd(was=X), type A
                  continue;
               }
               // del+upd -> N/A
               assert( prev_state.removed_values.find(item.second.id) == prev_state.removed_values.end() );
               // nop+upd(was=Y) -> upd(was=Y), type B
               prev_state.old_values.emplace( std::move(item) );
            }

            // *+new, but we assume the N/A cases don't happen, leaving type B nop+new -> new
            for( auto id : state.new_ids )
               prev_state.new_ids.insert(id);

            // *+del
            for( auto& obj : state.removed_values )
            {
               if( prev_state.new_ids.find(obj.second.id) != prev_state.new_ids.end() )
               {
                  // new + del -> nop (type C)
                  prev_state.new_ids.erase(obj.second.id);
                  continue;
               }
               auto it = prev_state.old_values.find(obj.second.id);
               if( it != prev_state.old_values.end() )
               {
                  // upd(was=X) + del(was=Y) -> del(was=X)
                  prev_state.removed_values.emplace( std::move(*it) );
                  prev_state.old_values.erase(obj.second.id);
                  continue;
               }
               // del + del -> N/A
               assert( prev_state.removed_values.find( obj.second.id ) == prev_state.removed_values.end() );
//.........这里部分代码省略.........

 /**
  * Unwinds all undo states
  */
 void undo_all()
 {
    while( enabled() )
       undo();
 }

void Download::setEnabled(bool e)
{
    m_enabled = e;
    emit enabled(e);
}

//___________________________________________________________________
bool LabelData::eventFilter( QObject* object, QEvent* event ) {

      if ( object != target_.data() ) return TransitionData::eventFilter( object, event );
      switch ( event->type() ) {

            case QEvent::Show:
                  /*
                  at show event, on set the old text to current
                  to avoid animate the "first" paint event.
                  text mnemonic is always removed to avoid triggering the animation when only the
                  latter is changed
                  */
                  text_ = target_.data()->text().remove( '&' );
                  break;

            case QEvent::Paint: {

                  if ( enabled() && target_  ) {

                        // remove showMnemonic from text before comparing
                        QString text( target_.data()->text().remove( '&' ) );
                        if ( text == text_ ) {
                              if ( transition().data()->isAnimated() && TransitionWidget::paintEnabled() ) return true;
                              else break;
                              }

                        // update text and pixmap
                        text_ = text;

                        if ( !(transition() && target_.data()->isVisible() ) ) break;

                        if ( transition().data()->isAnimated() ) {
                              transition().data()->endAnimation();
                              }

                        // check whether animations are locked
                        if ( isLocked() ) {

                              // hide transition widget
                              transition().data()->hide();

                              // restart the lock timer
                              // and abort transition
                              lockAnimations();
                              break;
                              }

                        // restart the lock timer
                        // and prepare transition
                        lockAnimations();
                        initializeAnimation();
                        timer_.start( 0, this );

                        if ( !transition().data()->startPixmap().isNull() && TransitionWidget::paintEnabled() ) {

                              // show the transition widget
                              // and disable this event painting
                              transition().data()->show();
                              transition().data()->raise();
                              return true;

                              }
                        else {

                              // hide transition widget and abort transition
                              transition().data()->hide();
                              break;

                              }

                        }
                  else if ( transition().data()->isAnimated() && TransitionWidget::paintEnabled() ) {

                        // disable painting when transition is running
                        // since label is obscured by transition widget
                        return true;

                        }
                  else break;
                  }

            default:
                  break;
            }

      return TransitionData::eventFilter( object, event );

      }

// Return commands to restore this breakpoint, using the dummy number
// NR.  If AS_DUMMY is set, delete the breakpoint immediately in order
// to increase the breakpoint number.  If ADDR is set, use ADDR as
// (fake) address.  If COND is set, use COND as (fake) condition.
// Return true iff successful.
bool BreakPoint::get_state(std::ostream& os, int nr, bool as_dummy,
			   string pos, string cond)
{
    if (pos.empty())
    { 
	if (line_nr() > 0)
	    pos = file_name() + ":" + itostring(line_nr());
	else
	    pos = string('*') + address();
    }

    if (cond == char(-1))
	cond = real_condition();

    const string num = "@" + itostring(nr) + "@";

    switch (gdb->type())
    {
    case BASH:
    case GDB:
    case MAKE:
    case PYDB:
    case DBG:
    {
	switch (type())
	{
	case BREAKPOINT:
	{
	    switch (dispo())
	    {
	    case BPKEEP:
	    case BPDIS:
		os << "break " << pos << "\n";
		break;

	    case BPDEL:
		os << "tbreak " << pos << "\n";
		break;
	    }
	    break;
	}

	case WATCHPOINT:
	{
	    os << gdb->watch_command(expr(), watch_mode()) << "\n";
	    break;
	}

	case TRACEPOINT:
	case ACTIONPOINT:
	{
	    // Not handled - FIXME
	    break;
	}
	}

	if (!as_dummy)
	{
	    // Extra infos
	    if (!enabled() && gdb->has_disable_command())
		os << gdb->disable_command(num) << "\n";
	    int ignore = ignore_count();
	    if (ignore > 0 && gdb->has_ignore_command())
		os << gdb->ignore_command(num, ignore) << "\n";
	    if (!cond.empty() && gdb->has_condition_command())
		os << gdb->condition_command(num, cond) << "\n";
	    if (commands().size() != 0)
	    {
		os << "commands " << num << "\n";
		for (int i = 0; i < commands().size(); i++)
		    os << commands()[i] << "\n";
		os << "end\n";
	    }
	}
	break;
    }

    case DBX:
    {
	string cond_suffix = "";
	if (!cond.empty())
	{
	    if (gdb->has_handler_command())
		cond_suffix = " -if " + cond;
	    else
		cond_suffix = " if " + cond;
	}

	switch (type())
	{
	case BREAKPOINT:
	    if (!func().empty())
	    {
		os << "stop in " << func() << "\n";
	    }
//.........这里部分代码省略.........

void LightComponent::onDraw(render::RenderQueue *ops)
{
    if (enabled())
        ops->lights.push_back(this);
}

 // Construct with specific option values.
 linger(bool e, int t)
 {
   enabled(e);
   timeout BOOST_PREVENT_MACRO_SUBSTITUTION(t);
 }