Question

使用Qt 5

编译时，以下代码会产生错误

styleComboBox = new QComboBox;
typedef QPair<QString, Qt::BrushStyle> BrushPair;
foreach (const BrushPair &pair, QList<BrushPair>()
        << qMakePair(tr("No Brush"), Qt::NoBrush)
        << qMakePair(tr("Solid"), Qt::SolidPattern)
        << qMakePair(tr("Dense #1"), Qt::Dense1Pattern)
        << qMakePair(tr("Dense #2"), Qt::Dense2Pattern)
        << qMakePair(tr("Dense #3"), Qt::Dense3Pattern)
        << qMakePair(tr("Dense #4"), Qt::Dense4Pattern)
        << qMakePair(tr("Dense #5"), Qt::Dense5Pattern)
        << qMakePair(tr("Dense #6"), Qt::Dense6Pattern)
        << qMakePair(tr("Horizontal"), Qt::HorPattern)
        << qMakePair(tr("Vertical"), Qt::VerPattern)
        << qMakePair(tr("Cross"), Qt::CrossPattern)
        << qMakePair(tr("Diagonal /"), Qt::BDiagPattern)
        << qMakePair(tr("Diagonal \\"), Qt::FDiagPattern)
        << qMakePair(tr("Diagonal Cross"), Qt::DiagCrossPattern))
    styleComboBox->addItem(pair.first, pair.second);

错误信息如下：

C:\Qt\Qt5.2.1\5.2.1\mingw48_32\include\QtCore\qvariant.h:481: error: 'QVariant::QVariant(Qt::BrushStyle)' is private
 QVariant(Qt::BrushStyle) Q_DECL_EQ_DELETE;
 ^

那我怎么克服它？

Answer 1

BrushStyle是枚举类型，而不是QVariant类型。我认为你的意思是使用QBrush。

styleComboBox = new QComboBox;
typedef QPair<QString, QBrush> BrushPair;
foreach (const BrushPair &pair, QList<BrushPair>()
        << qMakePair(tr("No Brush"), QBrush(Qt::NoBrush))
        << qMakePair(tr("Solid"), QBrush(Qt::SolidPattern))
...

在ComboBox上调用addItem时，您隐式将 BrushPair 的“第二个”成员转换为QVariant

QVariant :: QVariant（Qt :: BrushStyle）是私有的

1 个答案: