tableview中的checkbox和itemdelegate

Question

我正在做一个继承自QitemDelegate的CheckBox的实现,把它放到QTableView中.

问题是我在插入时向左冲,我需要它居中.

据我所知,负责Paint的方法.我写的如下:

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 );
}

什么缺少出现居中？

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 );

};

的.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);
}

Answer 1

如果你正在扩展这个QItemDelegate类,它有一个drawCheck()函数,它将为你绘制一个nince,居中的复选框.您可以在paint()函数中使用它.

编辑:

下面是一个示例,假设您有一个名为BooleanEditor,从QItemDelegate继承的类:

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:

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);}
};

在ItemDelegates中,createEditor()方法返回此BooleanWidget类的实例.在setModelData()和setEditorData()中,您现在可以将输入窗口小部件转换为此BooleanWidget:

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

然后使用is/setChecked方法.

Answer 2

我用以下项目委托解决了这个问题：

booleanitemdelegate.h

#ifndef BOOLEANITEMDELEGATE_H
#define BOOLEANITEMDELEGATE_H

#include <QItemDelegate>



class BooleanItemDelegate : public QItemDelegate
{
public:
    BooleanItemDelegate(QObject *parent);

public:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;public:
    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index);
};

#endif // BOOLEANITEMDELEGATE_H

布尔值委托.cpp

#include "booleanitemdelegate.h"

BooleanItemDelegate::BooleanItemDelegate(QObject *parent):
    QItemDelegate(parent)
{

}

void BooleanItemDelegate::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);
}

bool BooleanItemDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
    if(event->type() == QEvent::MouseButtonRelease){
        model->setData(index, !model->data(index).toBool());
        event->accept();
    }
    return QItemDelegate::editorEvent(event, model, option, index);
}

我希望，我能帮忙。