表格视图中的复选框和项目委托 [英] checkbox and itemdelegate in a tableview

问题描述

我正在实现一个继承自 QitemDelegate 的 CheckBox，将其放入 QTableView.

I'm doing an implementation of a CheckBox that inherits from QitemDelegate, to put it into a QTableView.

问题是当我插入左侧齐平时，我需要将其居中.

the problem is that I get when inserted flush left and I need it centered.

据我所知，负责绘制的方法.我是这样写的:

As I understand the method that is responsible for the Paint. I have it written as follows:

void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
bool checkValue;

QStyleOptionButton BtnStyle;
BtnStyle.state = QStyle::State_Enabled;

if(index.model()->data(index, Qt::DisplayRole).toBool() == true)
{
BtnStyle.state |= QStyle::State_On;
checkValue = true;
}else{
BtnStyle.state |= QStyle::State_Off;
checkValue = false;
}


BtnStyle.direction = QApplication::layoutDirection();
BtnStyle.rect = option.rect;
QApplication::style()->drawControl(QStyle::CE_CheckBox,&BtnStyle,painter );
QApplication::style()->drawControl(QStyle::CE_CheckBox,&BtnStyle,painter );
}

显示居中缺少什么?

所以我有委托:

.h

class BooleanWidget : public QWidget
{
    Q_OBJECT
    QCheckBox * checkBox;

    public:
    BooleanWidget(QWidget * parent = 0)
    {
        checkBox = new QCheckBox(this);
        QHBoxLayout * layout = new QHBoxLayout(this);
        layout->addWidget(checkBox,0, Qt::AlignCenter);

    }

    bool isChecked(){return checkBox->isChecked();}
    void setChecked(bool value){checkBox->setChecked(value);}
};

class CheckBoxDelegate : public QItemDelegate
{
    Q_OBJECT
private:
    BooleanWidget *checkbox;

public:
    CheckBoxDelegate(QObject *parent);
    ~CheckBoxDelegate();
    void setEditorData( QWidget *editor,const QModelIndex &index )const;
    void setModelData( QWidget *editor,QAbstractItemModel *model,const QModelIndex &index )const;
    QWidget *createEditor( QWidget *parent,const QStyleOptionViewItem &/* option */,const QModelIndex &/* index */ )const;
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;

public slots:
    void changed( bool );

};

.cpp

void CheckBoxDelegate::changed( bool value )
{
    BooleanWidget *checkbox = static_cast<BooleanWidget*>( sender() );
    emit commitData( checkbox );
    emit closeEditor( checkbox );
}

QWidget *CheckBoxDelegate::createEditor( QWidget *parent,const QStyleOptionViewItem &/* option */,const QModelIndex &/* index */ ) const
{
  BooleanWidget *editor = new BooleanWidget( parent );
  connect( editor, SIGNAL( toggled ( bool ) ), this, SLOT( changed( bool ) ) );

  return editor;
}

void CheckBoxDelegate::setEditorData( QWidget *editor,const QModelIndex &index ) const
{
    int value = index.model()->data(index, Qt::DisplayRole).toInt();

    BooleanWidget *checkbox = static_cast<BooleanWidget*>(editor);

    if(value == 1)
    {
        checkbox->setChecked(true);
    }
    else
    {
        checkbox->setChecked(false);
    }


}

void CheckBoxDelegate::setModelData( QWidget *editor,QAbstractItemModel *model,const QModelIndex &index ) const
{
    BooleanWidget *checkBox = qobject_cast<BooleanWidget*>( editor );
    Qt::CheckState value;

    if(checkBox->isChecked())
        value = Qt::Checked;
    else
        value = Qt::Unchecked;

    model->setData( index, value, Qt::DisplayRole);
}

void CheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    drawCheck(painter, option, option.rect, index.data().toBool() ? Qt::Checked : Qt::Unchecked);
    drawFocus(painter, option, option.rect);
}

推荐答案

如果你要扩展 QItemDelegate 类，它有一个 drawCheck() 函数，什么会为您绘制一个居中的复选框.你可以在paint()函数中使用它.

If you are extending the QItemDelegate class, it has a drawCheck() function, what will draw you a nince, centered checkbox. You can use it in the paint() function.

这里有一个例子，假设您有一个名为 BooleanEditor 的类，它继承自 QItemDelegate:

Here is an example, assuming you have a class called BooleanEditor, what inherits from QItemDelegate:

void BooleanEditor::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    drawCheck(painter, option, option.rect, index.data().toBool() ? Qt::Checked : Qt::Unchecked);
    drawFocus(painter, option, option.rect);
}

为了在进入编辑模式时保持复选框居中，您可以执行以下操作:

For keeping the checkbox centered when entering the edit mode, you can do something like this:

class BooleanWidget : public QWidget
{
    Q_OBJECT
    QCheckBox * checkBox;

    public:
    BooleanWidget(QWidget * parent = 0)
    {
        checkBox = new QCheckBox(this);
        QHBoxLayout * layout = new QHBoxLayout(this);
        layout->addWidget(checkBox,0, Qt::AlignCenter);
    }

    bool isChecked(){return checkBox->isChecked();}
    void setChecked(bool value){checkBox->setChecked(value);}
};

并在您的 ItemDelegates createEditor() 方法中返回此 BooleanWidget 类的实例.在您的 setModelData() 和 setEditorData() 中，您现在可以将您的输入小部件转换为这个 BooleanWidget:

And in your ItemDelegates createEditor() method return an instance of this BooleanWidget class. In your setModelData() and setEditorData() you can now cast your input widget to this BooleanWidget:

BooleanWidget * widget = qobject_cast<BooleanWidget*>(editor);

然后使用 is/setChecked 方法.

and then use the is/setChecked method.

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