Qt实现QQ好友下拉列表（用QListView实现，所以还得定义它的Model）

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偶然发现Qt有个控件可以实现下拉列表，所以就试着实现一下类似QQ面板的下拉列表，这里主要实现几个功能：

1.可以删除列表中图标

2.可以像qq一样的，把某个分组下的图标转移到另外的分组

3.添加分组

代码里写了注释了，这里就不重复了，下面直接看代码吧。

自定义的数据模型

ListModel继承了QAbstractListModel，主要是实现要显示的数据结构。用的是model/view的三层结构，这样好拆分

struct ListItemData
{
QString iconPath;
QString Name;
};
class ListModel:public QAbstractListModel
{
Q_OBJECT
public:
ListModel(QObject *parent = NULL);
~ListModel();
void init();
void addItem(ListItemData *pItem);
QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const ;
int rowCount ( const QModelIndex & parent = QModelIndex() ) const;
void deleteItem(int index);
ListItemData* getItem(int index );
protected:
private:
vector<ListItemData*> m_ItemDataVec;
};

<pre name="code" class="cpp">ListModel::ListModel( QObject *parent /*= NULL*/ ):QAbstractListModel(parent)
{
init();
}
ListModel::~ListModel()
{
}
QVariant ListModel::data( const QModelIndex & index, int role /*= Qt::DisplayRole */ ) const
{
if (index.row() > m_ItemDataVec.size())
{
return QVariant();
}
else
{
switch (role)
{
case Qt::DisplayRole:
{
return m_ItemDataVec[index.row()]->Name;
}
break;
case Qt::DecorationRole:
{
return QIcon(m_ItemDataVec[index.row()]->iconPath);
}
break;
case Qt::SizeHintRole:
{
return QSize(10,50);
}
}
}
return QVariant();
}
int ListModel::rowCount( const QModelIndex & parent /*= QModelIndex() */ ) const
{
return m_ItemDataVec.size();
}
void ListModel::init()
{
for (int i = 1; i < 26; ++i)
{
ListItemData *pItem = new ListItemData;
pItem->Name = QString::number(i);
pItem->iconPath = QString(":/QQPanel/Resources/%1.jpg").arg(i);
QFile Iconfile(pItem->iconPath);
if (Iconfile.exists())
{
m_ItemDataVec.push_back(pItem);
}
}
}
void ListModel::deleteItem( int index )
{
vector<ListItemData*>::iterator it = m_ItemDataVec.begin();
m_ItemDataVec.erase(it + index);
}
void ListModel::addItem( ListItemData *pItem )
{
if (pItem)
{
this->beginInsertRows(QModelIndex(),m_ItemDataVec.size(),m_ItemDataVec.size() + 1);
<span style="white-space:pre"> </span>m_ItemDataVec.push_back(pItem);
<span style="white-space:pre"> </span>this->endInsertRows();
}
}
ListItemData* ListModel::getItem( int index )
{
if (index > -1 && index < m_ItemDataVec.size())
{
return m_ItemDataVec[index];
}
}
</pre><br>
<br>
<pre></pre>
<h1><a name="t1"></a><br>
</h1>
<h1><a name="t2"></a>自定义的列表</h1>
<div>这个类才是重点，因为这里实现了删除和转移图标的几个重要的函数。</div>
<pre name="code" class="cpp">class MyListView:public QListView
{
Q_OBJECT
public:
MyListView(QWidget *parent = NULL);
~MyListView();
void setListMap(map<MyListView*,QString> *pListMap);
void addItem(ListItemData *pItem);
protected:
void contextMenuEvent ( QContextMenuEvent * event );
private slots:
void deleteItemSlot(bool bDelete);
void moveSlot(bool bMove);
private:
int m_hitIndex;
ListModel *m_pModel;
////记录分组和分组名字的映射关系，这个值跟QQPanel类中的映射组的值保持一致
//这里还有一个用处就是在弹出的菜单需要分组的名称
map<MyListView*,QString> *m_pListMap;
//记录每个菜单项对应的列表，才能知道要转移到那个分组
map<QAction*,MyListView*> m_ActionMap;
};</pre><br>
<pre name="code" class="cpp">MyListView::MyListView( QWidget *parent /*= NULL*/ ):QListView(parent)
{
m_hitIndex = -1;
m_pModel = new ListModel;
this->setModel(m_pModel);
m_pListMap = NULL;
}
MyListView::~MyListView()
{
}
void MyListView::contextMenuEvent( QContextMenuEvent * event )
{
int hitIndex = this->indexAt(event->pos()).column();
if (hitIndex > -1)
{
QMenu *pMenu = new QMenu(this);
QAction *pDeleteAct = new QAction(tr("删除"),pMenu);
pMenu->addAction(pDeleteAct);
connect(pDeleteAct,SIGNAL(triggered (bool)),this,SLOT(deleteItemSlot(bool)));
QMenu *pSubMenu = NULL;
map<MyListView*,QString>::iterator it = m_pListMap->begin();
for (it;it != m_pListMap->end();++it)
{
if (!pSubMenu)
{
pSubMenu = new QMenu(tr("转移联系人至") ,pMenu);
pMenu->addMenu(pSubMenu);
}
if (it->first != this)
{
QAction *pMoveAct = new QAction( it->second ,pMenu);
//记录菜单与分组的映射，在moveSlot()响应时需要用到。
m_ActionMap.insert(pair<QAction*,MyListView*>(pMoveAct,it->first));
pSubMenu->addAction(pMoveAct);
connect(pMoveAct,SIGNAL(triggered (bool)),this,SLOT(moveSlot(bool)));
}
}
pMenu->popup(mapToGlobal(event->pos()));
}
}
void MyListView::deleteItemSlot( bool bDelete )
{
int index = this->currentIndex().row();
if (index > -1)
{
m_pModel->deleteItem(index);
}
}
void MyListView::setListMap( map<MyListView*,QString> *pListMap )
{
m_pListMap = pListMap;
}
void MyListView::addItem( ListItemData *pItem )
{
m_pModel->addItem(pItem);
}
void MyListView::moveSlot( bool bMove )
{
QAction *pSender = qobject_cast<QAction*>(sender());
if (pSender)
{
//根据点击的菜单，找到相应的列表，然后才能把图标转移过去
MyListView *pList = m_ActionMap.find(pSender)->second;
if (pList)
{
int index = this->currentIndex().row();
ListItemData *pItem = m_pModel->getItem(index);
pList->addItem(pItem);
//添加到别的分组，就在原来的分组中删除掉了
m_pModel->deleteItem(index);
}
}
//操作完了要把这个临时的映射清空
m_ActionMap.clear();
}
</pre><br>
<h1><a name="t3"></a>自定义的主控件</h1>