Qt工作笔记在QTreeView上实现模型数据的拖拽.pdf

Qt⼯作笔记-在QTreeView上实现模型数据的拖拽

运⾏截图如下：

逻辑是：

1.QTreeView开发拖拽功能。

2.在⾃定义模型中重写

flags(constQModelIndexindex)const

mimeData(constQModelIndexListindexes)const

实现拖的功能

3.在⾃定义模型中重写

dropMimeData(constQMimeData*data,Qt::DropActionaction,introw,intcolumn,constQModelIndexparent)

mimeTypes()const

实现放的功能

代码如下：

mymodel.h

#ifndefMYMODEL_H

#defineMYMODEL_H

#includeQObject

#includeQStandardItemModel

classMyModel:publicQStandardItemModel

{

Q_OBJECT

public:

explicitMyModel(QStandardItemModel*parent=0);

Qt::ItemFlagsflags(constQModelIndexindex)const;

QMimeData*mimeData(constQModelIndexListindexes)const;

booldropMimeData(constQMimeData*data,Qt::DropActionaction,introw,intcolumn,constQModelIndexparent);

QStringListmimeTypes()const;

signals:

publicslots:

private:

intm_rowCount;

};

#endif//MYMODEL_H

widget.h

#ifndefWIDGET_H

#defineWIDGET_H

#includeQWidget

classMyModel;

namespaceUi{

classWidget;

}

classWidget:publicQWidget

{

Q_OBJECT

public:

explicitWidget(QWidget*parent=0);

~Widget();

private:

Ui::Widget*ui;

MyModel*m_model1;

MyModel*m_model2;

};

#endif//WIDGET_H

main.cpp

#includewidget.h

#includeQApplication

intmain(intargc,char*argv[])

{

QApplicationa(argc,argv);

Widgetw;

w.show();

returna.exec();

}

mymodel.cpp

#includemymodel.h

#includeQDebug

#includeQMimeData

#includeQModelIndexList

MyModel::MyModel(QStandardItemModel*parent)

:QStandardItemModel(parent)

{

m_rowCount=0;

}

Qt::ItemFlagsMyModel::flags(constQModelIndexindex)const

{

Qt::ItemFlagsflags=QAbstractItemModel::flags(index);

flags=flags|Qt::ItemIsDragEnabled|Qt::It