自学教程：C++ updateScrollBars函数代码示例

bool QScrollView::qt_invoke( int _id, QUObject* _o ){    switch ( _id - staticMetaObject()->slotOffset() ) {    case 0: resizeContents((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2)); break;    case 1: scrollBy((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2)); break;    case 2: setContentsPos((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2)); break;    case 3: ensureVisible((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2)); break;    case 4: ensureVisible((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2),(int)static_QUType_int.get(_o+3),(int)static_QUType_int.get(_o+4)); break;    case 5: center((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2)); break;    case 6: center((int)static_QUType_int.get(_o+1),(int)static_QUType_int.get(_o+2),(float)(*((float*)static_QUType_ptr.get(_o+3))),(float)(*((float*)static_QUType_ptr.get(_o+4)))); break;    case 7: updateScrollBars(); break;    case 8: setEnabled((bool)static_QUType_bool.get(_o+1)); break;    case 9: hslide((int)static_QUType_int.get(_o+1)); break;    case 10: vslide((int)static_QUType_int.get(_o+1)); break;    case 11: hbarIsPressed(); break;    case 12: hbarIsReleased(); break;    case 13: vbarIsPressed(); break;    case 14: vbarIsReleased(); break;    case 15: doDragAutoScroll(); break;    case 16: startDragAutoScroll(); break;    case 17: stopDragAutoScroll(); break;    default:	return QFrame::qt_invoke( _id, _o );    }    return TRUE;}

void ossimGui::ImageScrollWidget::resizeEvent(QResizeEvent* event){   QAbstractScrollArea::resizeEvent(event);   m_widget->resize(size());   updateScrollBars();   m_scrollOrigin.x = horizontalScrollBar()->value();   m_scrollOrigin.y = verticalScrollBar()->value();      updateTransforms();      setCacheRect();   if(m_layers->findFirstDirtyLayer())   {      if(m_jobQueue.valid())      {         if(!m_imageWidgetJob->isRunning()) m_imageWidgetJob->ready();         m_jobQueue->add(m_imageWidgetJob.get());      }   }   // This would be useful only for HUD??   //m_regOverlay->resize(event->size());   // event->accept(); //???}

void AdvScrollArea::resizeEvent(QResizeEvent* e) {	std::cout << "RESIZE TO: " << e->size().width() << ":"<< e->size().height() << std::endl;	Q_UNUSED(e);	// scrollbar size	unsigned int scrS = 16;	unsigned int top = (headerH.widget) ? (headerH.height) : (0);	unsigned int left = (headerV.widget) ? (headerV.width) : (0);	// area	unsigned int areaW = width() - scrS - left;	unsigned int areaH = height() - scrS - top;	area->setGeometry(left, top, areaW, areaH);	area->setMaximumSize(areaW, areaH);	// scrollbar position	scrollV->setGeometry(width()-scrS, top, scrS, height()-scrS-top);	scrollH->setGeometry(left, height()-scrS, width()-scrS-left, scrS);	// scrollbar values	updateScrollBars();	// move the widget	updateWidgetPosition();}

	void ScrollPane::add( Widget *widget )	{		pChildContent->add(widget);		pChildContent->setSize(Dimension(getContentWidth(),getContentHeight()));		updateScrollBars();	}

void CQueryTable::refresh(){  if (isBlocked())    return;  reset();  m_cancel = false;  if (!query()->isResultNull())  {    setBlocked(true);    query()->dataSeek(0);    uint num_fields = query()->numFields();    ulong num_rows = query()->numRows();    setNumRows(num_rows);    setNumCols(num_fields);    QPixmap icon;    bool columns_ok = (keepColumnWidth() && previous_columns_map.count() == num_fields);    if (columns_ok)      for (uint i = 0; i < num_fields; i++)        columns_ok &= (previous_columns_map[i].label == query()->fields(i).name);    if (!columns_ok && keepColumnWidth())      previous_columns_map.clear();    for (uint i = 0; i < num_fields; i++)    {      if (IS_PRI_KEY(query()->fields(i).flags))        icon = pkIcon;      else if (IS_MUL_KEY(query()->fields(i).flags))        icon = mulIcon;      else if (IS_UNI_KEY(query()->fields(i).flags))        icon = uniIcon;      else             icon = nothingIcon;      if (columns_ok && previous_columns_map[i].label == query()->fields(i).name)        horizontalHeader()->setLabel(i, icon, query()->fields(i).name, previous_columns_map[i].size);      else        horizontalHeader()->setLabel(i, icon, query()->fields(i).name);    }    if (hasProcessEvents())      qApp->processEvents();    else      updateScrollBars();    ulong j = 0;    while (query()->next(!hasProcessEvents()))    {      if (m_cancel)        break;      for (uint i = 0; i < num_fields; i++)        setText(j, i, query()->row(i));      j++;    }    setBlocked(false);    emit refreshed();  }  else    if (!previous_columns_map.empty())      previous_columns_map.clear();}

void ScrollZoomer::setVScrollBarPosition( ScrollBarPosition pos ){    if ( d_vScrollData->position != pos )    {        d_vScrollData->position = pos;        updateScrollBars();    }}

void MultiLineEdit::setScrollBarsEnabled(bool enable){    if (_scrollBarsEnabled == enable)        return;    _scrollBarsEnabled = enable;    updateScrollBars();}

void RosegardenScrollView::resizeEvent(QResizeEvent* e){    QAbstractScrollArea::resizeEvent(e);    updateScrollBars();//### What was the purpose of this?//    if (!horizontalScrollBar()->isVisible())    updateBottomWidgetGeometry();}

void CodeEditorComponent::moveCaretTo (const CodeDocument::Position& newPos, const bool highlighting){    caretPos = newPos;    columnToTryToMaintain = -1;    bool selectionWasActive = isHighlightActive();    if (highlighting)    {        if (dragType == notDragging)        {            if (abs (caretPos.getPosition() - selectionStart.getPosition())                  < abs (caretPos.getPosition() - selectionEnd.getPosition()))                dragType = draggingSelectionStart;            else                dragType = draggingSelectionEnd;        }        if (dragType == draggingSelectionStart)        {            selectionStart = caretPos;            if (selectionEnd.getPosition() < selectionStart.getPosition())            {                const CodeDocument::Position temp (selectionStart);                selectionStart = selectionEnd;                selectionEnd = temp;                dragType = draggingSelectionEnd;            }        }        else        {            selectionEnd = caretPos;            if (selectionEnd.getPosition() < selectionStart.getPosition())            {                const CodeDocument::Position temp (selectionStart);                selectionStart = selectionEnd;                selectionEnd = temp;                dragType = draggingSelectionStart;            }        }        rebuildLineTokensAsync();    }    else    {        deselectAll();    }    updateCaretPosition();    scrollToKeepCaretOnScreen();    updateScrollBars();    if (appCommandManager != nullptr && selectionWasActive != isHighlightActive())        appCommandManager->commandStatusChanged();}

QcScrollArea::QcScrollArea() :    paint(false),    painting(false){    setViewport( new QWidget() );    scrollWidget = new QcScrollWidget( viewport() );    scrollWidget->installEventFilter( this );    updateScrollBars();}

void ScrollZoomer::setHScrollBarMode(Qt::ScrollBarPolicy mode)#endif{  if (hScrollBarMode() != mode)    {      d_hScrollData->mode = mode;      updateScrollBars();    }}

void ScrollZoomer::rescale(){    QwtScaleWidget *xScale = plot()->axisWidget( xAxis() );    QwtScaleWidget *yScale = plot()->axisWidget( yAxis() );    if ( zoomRectIndex() <= 0 )    {        if ( d_inZoom )        {            xScale->setMinBorderDist( 0, 0 );            yScale->setMinBorderDist( 0, 0 );            QwtPlotLayout *layout = plot()->plotLayout();            for ( int axis = 0; axis < QwtAxis::PosCount; axis++ )                layout->setAlignCanvasToScale( axis, d_alignCanvasToScales );            d_inZoom = false;        }    }    else    {        if ( !d_inZoom )        {            /*             We set a minimum border distance.             Otherwise the canvas size changes when scrolling,             between situations where the major ticks are at             the canvas borders (requiring extra space for the label)             and situations where all labels can be painted below/top             or left/right of the canvas.             */            int start, end;            xScale->getBorderDistHint( start, end );            xScale->setMinBorderDist( start, end );            yScale->getBorderDistHint( start, end );            yScale->setMinBorderDist( start, end );            QwtPlotLayout *layout = plot()->plotLayout();            for ( int axis = 0; axis < QwtAxis::PosCount; axis++ )            {                d_alignCanvasToScales[axis] =                     layout->alignCanvasToScale( axis );            }            layout->setAlignCanvasToScales( false );            d_inZoom = true;        }    }    QwtPlotZoomer::rescale();    updateScrollBars();}

void AdvScrollArea::setWidget(QWidget* content) {	this->content = content;	//layout->addWidget(content);	content->setParent(area);	content->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);	content->setMinimumSize(100, 100);	content->move(0,0);	content->installEventFilter(this);	updateScrollBars();}

void CodeEditorComponent::moveCaretTo (const CodeDocument::Position& newPos, const bool highlighting){    caretPos = newPos;    columnToTryToMaintain = -1;    if (highlighting)    {        if (dragType == notDragging)        {            if (abs (caretPos.getPosition() - selectionStart.getPosition())                  < abs (caretPos.getPosition() - selectionEnd.getPosition()))                dragType = draggingSelectionStart;            else                dragType = draggingSelectionEnd;        }        if (dragType == draggingSelectionStart)        {            selectionStart = caretPos;            if (selectionEnd.getPosition() < selectionStart.getPosition())            {                const CodeDocument::Position temp (selectionStart);                selectionStart = selectionEnd;                selectionEnd = temp;                dragType = draggingSelectionEnd;            }        }        else        {            selectionEnd = caretPos;            if (selectionEnd.getPosition() < selectionStart.getPosition())            {                const CodeDocument::Position temp (selectionStart);                selectionStart = selectionEnd;                selectionEnd = temp;                dragType = draggingSelectionStart;            }        }        triggerAsyncUpdate();    }    else    {        deselectAll();    }    updateCaretPosition();    scrollToKeepCaretOnScreen();    updateScrollBars();}

void CodeEditorComponent::resized(){    linesOnScreen = (getHeight() - scrollbarThickness) / lineHeight;    columnsOnScreen = (int) ((getWidth() - scrollbarThickness) / charWidth);    lines.clear();    rebuildLineTokens();    ((CaretComponent*) caret)->updatePosition (*this);    verticalScrollBar->setBounds (getWidth() - scrollbarThickness, 0, scrollbarThickness, getHeight() - scrollbarThickness);    horizontalScrollBar->setBounds (gutter, getHeight() - scrollbarThickness, getWidth() - scrollbarThickness - gutter, scrollbarThickness);    updateScrollBars();}

voidScrollZoomer::setCornerWidget(QWidget* w){  if (w != d_cornerWidget) {    if (canvas()) {      delete d_cornerWidget;      d_cornerWidget = w;      if (d_cornerWidget->parent() != canvas())        d_cornerWidget->setParent(canvas());      updateScrollBars();    }  }}

void TLFrameSequenceLayout::updateContentSize(){    if ( contentsHeight() < number_of_frame_sequences * 24 )    {    	resizeContents( contentsWidth(), number_of_frame_sequences * 24 );    }    else if ( contentsHeight() > number_of_frame_sequences * 24 && contentsHeight() > 90 )    {        resizeContents( contentsWidth(), contentsHeight() - 24 );    }    updateContents();    updateScrollBars();    parent_widget -> update();}

AdvScrollArea::AdvScrollArea(QWidget* parent) :	QWidget(parent), content(nullptr) {	// both scrollbars	scrollV = new QScrollBar(Qt::Vertical, this);	scrollH = new QScrollBar(Qt::Horizontal, this);	// connect events	connect(scrollV, SIGNAL(valueChanged(int)), this, SLOT(onScrollV()));	connect(scrollH, SIGNAL(valueChanged(int)), this, SLOT(onScrollH()));	// the widget accepting the content	area = new QWidget(this);	updateScrollBars();	updateWidgetPosition();}

//==============================================================================void CodeEditorComponent::resized(){    const int visibleWidth = getWidth() - scrollbarThickness - getGutterSize();    linesOnScreen   = jmax (1, (getHeight() - scrollbarThickness) / lineHeight);    columnsOnScreen = jmax (1, (int) (visibleWidth / charWidth));    lines.clear();    rebuildLineTokens();    updateCaretPosition();    if (gutter != nullptr)        gutter->setBounds (0, 0, getGutterSize() - 2, getHeight());    verticalScrollBar.setBounds (getWidth() - scrollbarThickness, 0,                                 scrollbarThickness, getHeight() - scrollbarThickness);    horizontalScrollBar.setBounds (getGutterSize(), getHeight() - scrollbarThickness,                                   visibleWidth, scrollbarThickness);    updateScrollBars();}

//==============================================================================void CodeEditorComponent::codeDocumentChanged (const CodeDocument::Position& affectedTextStart,                                               const CodeDocument::Position& affectedTextEnd){    clearCachedIterators (affectedTextStart.getLineNumber());    triggerAsyncUpdate();    ((CaretComponent*) caret)->updatePosition (*this);    if (affectedTextEnd.getPosition() >= selectionStart.getPosition()         && affectedTextStart.getPosition() <= selectionEnd.getPosition())        deselectAll();    if (caretPos.getPosition() > affectedTextEnd.getPosition()         || caretPos.getPosition() < affectedTextStart.getPosition())        moveCaretTo (affectedTextStart, false);    updateScrollBars();}