自学教程：C++ updatePreview函数代码示例

void QgsFontButton::prepareMenu(){  //we need to tear down and rebuild this menu every time it is shown. Otherwise the space allocated to any  //QgsColorSwatchGridAction is not recalculated by Qt and the swatch grid may not be the correct size  //for the number of colors shown in the grid. Note that we MUST refresh color swatch grids every time this  //menu is opened, otherwise color schemes like the recent color scheme grid are meaningless  mMenu->clear();  QWidgetAction *sizeAction = new QWidgetAction( mMenu );  QWidget *sizeWidget = new QWidget();  QVBoxLayout *sizeLayout = new QVBoxLayout();  sizeLayout->setMargin( 0 );  sizeLayout->setContentsMargins( 0, 0, 0, 3 );  sizeLayout->setSpacing( 2 );  QString fontHeaderLabel;  switch ( mMode )  {    case ModeTextRenderer:      fontHeaderLabel = tr( "Font size (%1)" ).arg( QgsUnitTypes::toString( mFormat.sizeUnit() ) );      break;    case ModeQFont:      fontHeaderLabel = tr( "Font size (pt)" );      break;  }  QgsMenuHeader *sizeLabel = new QgsMenuHeader( fontHeaderLabel );  sizeLayout->addWidget( sizeLabel );  QgsDoubleSpinBox *sizeSpin = new QgsDoubleSpinBox( nullptr );  sizeSpin->setDecimals( 4 );  sizeSpin->setMaximum( 1e+9 );  sizeSpin->setShowClearButton( false );  sizeSpin->setValue( mMode == ModeTextRenderer ? mFormat.size() : mFont.pointSizeF() );  connect( sizeSpin, static_cast < void ( QgsDoubleSpinBox::* )( double ) > ( &QgsDoubleSpinBox::valueChanged ),           this, [ = ]( double value )  {    switch ( mMode )    {      case ModeTextRenderer:        mFormat.setSize( value );        break;      case ModeQFont:        mFont.setPointSizeF( value );        break;    }    updatePreview();    emit changed();  } );  QHBoxLayout *spinLayout = new QHBoxLayout();  spinLayout->setMargin( 0 );  spinLayout->setContentsMargins( 4, 0, 4, 0 );  spinLayout->addWidget( sizeSpin );  sizeLayout->addLayout( spinLayout );  sizeWidget->setLayout( sizeLayout );  sizeAction->setDefaultWidget( sizeWidget );  sizeWidget->setFocusProxy( sizeSpin );  sizeWidget->setFocusPolicy( Qt::StrongFocus );  mMenu->addAction( sizeAction );  QMenu *recentFontMenu = new QMenu( tr( "Recent fonts" ), mMenu );  Q_FOREACH ( const QString &family, QgsFontUtils::recentFontFamilies() )  {    QAction *fontAction = new QAction( family, recentFontMenu );    QFont f = fontAction->font();    f.setFamily( family );    fontAction->setFont( f );    fontAction->setToolTip( family );    recentFontMenu->addAction( fontAction );    if ( ( mMode == ModeTextRenderer && family == mFormat.font().family() )         || ( mMode == ModeQFont && family == mFont.family() ) )    {      fontAction->setCheckable( true );      fontAction->setChecked( true );    }    auto setFont = [this, family]    {      switch ( mMode )      {        case ModeTextRenderer:        {          QgsTextFormat newFormat = mFormat;          QFont f = newFormat.font();          f.setFamily( family );          newFormat.setFont( f );          setTextFormat( newFormat );          QgsFontUtils::addRecentFontFamily( mFormat.font().family() );          break;        }        case ModeQFont:        {          QFont font = mFont;          font.setFamily( family );          setCurrentFont( font );          QgsFontUtils::addRecentFontFamily( family );          break;        }      }//.........这里部分代码省略.........

void KSnapshot::performGrab(){    int x = 0;    int y = 0;    grabber->releaseMouse();    grabber->hide();    grabTimer.stop();    title.clear();    windowClass.clear();    if ( mode() == ChildWindow ) {        WindowGrabber wndGrab;        connect( &wndGrab, SIGNAL(windowGrabbed(QPixmap)),                           SLOT(slotWindowGrabbed(QPixmap)) );        wndGrab.exec();        QPoint offset = wndGrab.lastWindowPosition();        x = offset.x();        y = offset.y();        qDebug() << "last window position is" << offset;    }    else if ( mode() == WindowUnderCursor ) {        snapshot = WindowGrabber::grabCurrent( includeDecorations() );        QPoint offset = WindowGrabber::lastWindowPosition();        x = offset.x();        y = offset.y();        // If we're showing decorations anyway then we'll add the title and window        // class to the output image meta data.        if ( includeDecorations() ) {            title = WindowGrabber::lastWindowTitle();        }    }    else if ( mode() == CurrentScreen ) {        qDebug() << "Desktop Geom2 = " << QApplication::desktop()->geometry();        QDesktopWidget *desktop = QApplication::desktop();        int screenId = desktop->screenNumber( QCursor::pos() );        qDebug() << "Screenid2 = " << screenId;        QRect geom = desktop->screenGeometry( screenId );        qDebug() << "Geometry2 = " << geom;        x = geom.x();        y = geom.y();        snapshot = QPixmap::grabWindow( desktop->winId(),                x, y, geom.width(), geom.height() );    }    else {        snapshot = QPixmap::grabWindow( QApplication::desktop()->winId() );    }#ifdef HAVE_X11_EXTENSIONS_XFIXES_H    if (haveXFixes && includePointer()) {        grabPointerImage(x, y);    }#endif // HAVE_X11_EXTENSIONS_XFIXES_H    if ( snapshot.isNull() )    {        mainWidget->ok_btn->setEnabled(false);        mainWidget->save_btn->setEnabled(false);    }    else    {        mainWidget->ok_btn->setEnabled(true);        mainWidget->save_btn->setEnabled(true);    }    updatePreview();    QApplication::restoreOverrideCursor();    modified = true;    updateCaption();    if (savedPosition != QPoint(-1, -1)) {        move(savedPosition);    }    show();}

Desktopwidget::Desktopwidget (QWidget *parent)      : QSplitter (parent)   {   _model = new Dirmodel ();//    _model->setLazyChildCount (true);   _dir = new Dirview (this);   _dir->setModel (_model);   _contents = new Desktopmodel (this);   QWidget *group = createToolbar();   _view = new Desktopview (group);   QVBoxLayout *lay = new QVBoxLayout (group);   lay->setContentsMargins (0, 0, 0, 0);   lay->setSpacing (2);   lay->addWidget (_toolbar);   lay->addWidget (_view);   connect (_view, SIGNAL (itemPreview (const QModelIndex &, int, bool)),         this, SLOT (slotItemPreview (const QModelIndex &, int, bool)));#ifdef USE_PROXY   _proxy = new Desktopproxy (this);   _proxy->setSourceModel (_contents);   _view->setModel (_proxy);//    printf ("contents=%p, proxy=%p/n", _contents, _proxy);   // set up the model converter   _modelconv = new Desktopmodelconv (_contents, _proxy);   // setup another one for Desktopmodel, which only allows assertions   _modelconv_assert = new Desktopmodelconv (_contents, _proxy, false);#else   _proxy = 0;   _view->setModel (_contents);   _modelconv = new Desktopmodelconv (_contents);   // setup another one for Desktopmodel, which only allows assertions   _modelconv_assert = new Desktopmodelconv (_contents, false);#endif   _view->setModelConv (_modelconv);   _contents->setModelConv (_modelconv_assert);   _delegate = new Desktopdelegate (_modelconv, this);   _view->setItemDelegate (_delegate);   connect (_delegate, SIGNAL (itemClicked (const QModelIndex &, int)),         this, SLOT (slotItemClicked (const QModelIndex &, int)));   connect (_delegate, SIGNAL (itemPreview (const QModelIndex &, int, bool)),         this, SLOT (slotItemPreview (const QModelIndex &, int, bool)));   connect (_delegate, SIGNAL (itemDoubleClicked (const QModelIndex &)),      this, SLOT (openStack (const QModelIndex &)));   connect (_contents, SIGNAL (undoChanged ()),      this, SIGNAL (undoChanged ()));   connect (_contents, SIGNAL (dirChanged (QString&, QModelIndex&)),      this, SLOT (slotDirChanged (QString&, QModelIndex&)));   connect (_contents, SIGNAL (beginningScan (const QModelIndex &)),      this, SLOT (slotBeginningScan (const QModelIndex &)));   connect (_contents, SIGNAL (endingScan (bool)),      this, SLOT (slotEndingScan (bool)));   connect (_contents, SIGNAL(updateRepositoryList (QString &, bool)),            this, SLOT(slotUpdateRepositoryList (QString &, bool)));    // position the items when the model is reset, otherwise things    // move and look ugly for a while    connect (_contents, SIGNAL (modelReset ()), _view, SLOT (setPositions ()));   createPage();   // and when there are no selected items   connect (_view, SIGNAL (pageLost()), _page, SLOT (slotReset ()));   _parent = parent;   _pendingMatch = QString::null;   _updating = false;   // setup the preview timer   _timer = new QTimer ();   _timer->setSingleShot (true);   connect (_timer, SIGNAL(timeout()), this, SLOT(updatePreview()));   connect (_dir, SIGNAL (clicked (const QModelIndex&)),            this, SLOT (dirSelected (const QModelIndex&)));   connect (_dir, SIGNAL (activated (const QModelIndex&)),            this, SLOT (dirSelected (const QModelIndex&)));   connect (_model, SIGNAL(droppedOnFolder(const QMimeData *, QString &)),            this, SLOT(slotDroppedOnFolder(const QMimeData *, QString &)));   /* notice when the current directory is fully displayed so we can handle      any pending action */   connect (_contents, SIGNAL (updateDone()), this, SLOT (slotUpdateDone()));   // connect signals from the directory tree   connect (_dir->_new, SIGNAL (triggered ()), this, SLOT (newDir ()));   connect (_dir->_rename, SIGNAL (triggered ()), this, SLOT (renameDir ()));   connect (_dir->_delete, SIGNAL (triggered ()), this, SLOT (deleteDir ()));   connect (_dir->_refresh, SIGNAL (triggered ()), this, SLOT (refreshDir ()));//.........这里部分代码省略.........

void PreviewEditor::buildWidget(){	previewWidget = new PreviewWidget(this);	locationIDE = new QComboBox(this);	int i=0;	foreach(const QString &loc, Data::locations().list())		locationIDE->addItem(loc, i++);	saveCountE = new SpinBox16(this);	curSaveE = new SpinBox32(this);	autoGroup = new QGroupBox(tr("Auto."));	autoGroup->setCheckable(true);	hpLeaderE = new SpinBox16(autoGroup);	hpMaxLeaderE = new SpinBox16(autoGroup);	gilsE = new SpinBox32(autoGroup);	timeE = new TimeWidget(autoGroup);	nivLeaderE = new SpinBox8(autoGroup);	discE = new SpinBox32(autoGroup);	discE->setRange(1, double(MAX_INT32) + 1.0);	QComboBox *comboBox;	QList<QIcon> icons;	for(int i=0 ; i<16 ; ++i) {		icons.append(QIcon(QString(":/images/icons/perso%1.png").arg(i)));	}	for(int i=0 ; i<3 ; ++i) {		partyE.append(comboBox = new QComboBox(autoGroup));		comboBox->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLengthWithIcon);		comboBox->addItem("-", 255);		for(int j=0 ; j<16 ; ++j) {			comboBox->addItem(icons.at(j), Data::names().at(j), j);		}	}	QHBoxLayout *partyL = new QHBoxLayout;	partyL->addWidget(partyE.first());	partyL->addWidget(partyE.at(1));	partyL->addWidget(partyE.last());	partyL->setContentsMargins(QMargins());	QGridLayout *autoL = new QGridLayout(autoGroup);	autoL->addWidget(new QLabel(tr("HP leader (inutilisé)"), autoGroup), 0, 0);	autoL->addWidget(hpLeaderE, 0, 1);	autoL->addWidget(new QLabel(tr("HP max. leader (inutilisé)"), autoGroup), 0, 2);	autoL->addWidget(hpMaxLeaderE, 0, 3);	autoL->addWidget(new QLabel(tr("Niveau leader"), autoGroup), 0, 4);	autoL->addWidget(nivLeaderE, 0, 5);	autoL->addWidget(new QLabel(tr("Argent"), autoGroup), 1, 0);	autoL->addWidget(gilsE, 1, 1);	autoL->addWidget(new QLabel(tr("Temps"), autoGroup), 1, 2);	autoL->addWidget(timeE, 1, 3);	autoL->addWidget(new QLabel(tr("Disque"), autoGroup), 1, 4);	autoL->addWidget(discE, 1, 5);	autoL->addWidget(new QLabel(tr("
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