QTreeView中某些索引的自定义文本颜色 [英] Custom text color for certain indexes in QTreeView
问题描述
我想使用自定义颜色(取决于与每行相关的数据)在QTreeView窗口小部件的一个列中绘制文本。我试图重载drawRow()保护方法,并更改样式选项参数像这样(一个精简的例子):
virtual void drawRow(QPainter * p_painter,const QStyleOptionViewItem& option,
const QModelIndex& index)const
{
QStyleOptionViewItem optionCustom = option;
if(index.column()== 2)
{
optionCustom.palette.setColor(QPalette :: Text,Qt :: red);
}
QTreeView :: drawRow(p_painter,optionCustom,index);
}
但是显然我缺少一些东西,因为这似乎不工作更改 QPalette :: WindowText
颜色角色)。
在您的模型中,扩展 data()
函数以将 Qt :: ForegroundRole
角色返回给定的颜色。 / p>
例如:
virtual QVariant MyModel :: data(const QModelIndex & index,int role)const
{
if(index.isValid()&&&&& ()== 2)
{
return QVariant(QColor(Qt :: red));
}
return QVariant(QColor(Qt :: black));
}
return QAbstractItemModel :: data(index,role);
}
I would like to draw texts in one of the columns in a QTreeView widget using a custom color (depending on the data related to each row). I tried to overload the drawRow() protected method and change the style option parameter like this (a stripped-down example):
virtual void drawRow(QPainter* p_painter, const QStyleOptionViewItem& option,
const QModelIndex& index) const
{
QStyleOptionViewItem optionCustom = option;
if (index.column() == 2)
{
optionCustom.palette.setColor(QPalette::Text, Qt::red);
}
QTreeView::drawRow(p_painter, optionCustom, index);
}
But obviously I am missing something because this does not seem to work (I tried to change also the QPalette::WindowText
color role).
In your model, extend the data()
function to return a given color as the Qt::ForegroundRole
role.
For example:
virtual QVariant MyModel::data( const QModelIndex &index, int role ) const
{
if ( index.isValid() && role == Qt::ForegroundRole )
{
if ( index.column() == 2 )
{
return QVariant( QColor( Qt::red ) );
}
return QVariant( QColor( Qt::black ) );
}
return QAbstractItemModel::data( index, role );
}
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