Qt之QComboBox定制(二)

上一篇文章Qt之QComboBox定制讲到了qt实现自定义的下拉框，该篇文章主要实现了列表式的下拉框，这一节我还将继续讲解QComboBox的定制，而这一节我将会讲述更高级的用法，不仅仅是下拉列表框，而可以实现下拉框为表格，原理其实上一篇文章中的列表框类似，不过在这篇文章我将会重点讲述一下不同的地方，好了，下边我先截取一下demo中的运行效果图，如图1所示，效果并不是那么美观，不过确实有很大的用处。

图1 表格下拉框

看了上图中的展示，是不是觉得很眼熟，是的，同学你说对了，其实这个界面时仿照铁道部的地区选组框做出来的，只不过是效果上有所差异，而功能上基本差不多，上图中的标题栏我是为了实现透明的表头而故意设置透明的，设置透明也是我后边重点要说的，怎么实现下拉框的背景色透明。

在文章的讲解开始前，我先截取下其他两个下拉框的截取，让有所期待的同学一睹为快。说实话，现在的下拉框并不是那么好看，不过用好了qss，这个就不是那么重要了，重要的是下拉框的交互功能，如图2是下拉框列表框，如图3是下拉框表格，不同于图1，图3是不支持根据表头切换内容的下拉框表格。

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" 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图2 下拉框列表

aaarticlea/png;base64,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" alt="" />

图3 下拉框表格

首先声明一下，在看这篇文章的时候我默认同学们已经看过Qt之QComboBox定制这篇文章，我的代码都是在这个demo的基础上重构出来的，如果有什么疑问可以去这篇文章中看看，或者直接私信我。

说起这个demo，我主要是按照两个路线来实现下拉框界面定制，列表和表格，所以我在实现的时候会分出这两个类来进行封装，然后在把他们的一些公有的操作提取出来，作为一层父类，也就是上文中所提到的博客中的combobox类。

接下来就是代码时刻，demo我会在文章最后给出下载链接，因此文章中我只贴出关键的代码段，

1、首先先来理解下文章中关键的类，理解了这几个类，这个demo的骨架就清楚了

CComboBox：下拉框父类，实现了大多数的数据添加接口

CListPopupComboBox：下拉框列表，如图2

CCheckBoxHeaderView：水平表头，主要是自绘表头

CTablePopupComboBox：下拉框表格，如图3

CTableRowHeaderView：列表头

CCityComboBox：城市选择下拉框，如图1

2、demo中的注释也是主要集中在接口中，不过在这里我还是要在不厌其烦的说一下接口相关的东西，毕竟接口就像是人的眼睛，接口弄明白了才能正确使用。

 class CComboBox : public QWidget
 {
 public:
     CComboBox(CustomPopupComboBox::ItemType type, QWidget * parent = nullptr);
     ~CComboBox(){}

 public:
     //设置分隔符  默认为'|'
     void SetSeparatorSymbol(char symbol);
     char GetSeparatorSymbol() const { return m_SeparatorSymbol; }

     //新增数据
     void AddText(const QString & text);
     void AddTexts(const QVector<QString> & items);

     //设置下拉框属性
     void SetItemWidth(int width);
     void SetItemHeight(int height);

     //设置最多可见条目数
     void SetMaxVisibleCount(int count);

     //设置下拉框中项模式
     void SetItemType(CustomPopupComboBox::ItemType type){ m_Type = type; }
     CustomPopupComboBox::ItemType GetItemType() const { return m_Type; }

 protected:
     virtual bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;

 protected:
     virtual void AddItem(const QString & text) = ;
     virtual void ResetItemWidth(int width) = ;
     virtual void ResetItemHeight(int height) = ;

 protected:
     QWidget * NewItem(const QString & text);

 protected:
     CustomPopupComboBox::ItemType m_Type = CustomPopupComboBox::LabelItem;
     char m_SeparatorSymbol = '|';//表格选择项分隔符
     int m_ItemCount = ;//表格总的项数
     QString m_CurrentMemory;//当前选择字符串
     QComboBox * m_ComboBox = nullptr;
     QWidget * m_BottomWidget = nullptr;
     QWidget * m_PopupWidget = nullptr;

     //定制项信息
     int m_ItemWidth = ;
     int m_ItemHeight = ;//需要和css文件中的QComboBox QAbstractItemView::item{height:45px;}对应

 private:
     void InitializeUI();
 };

上述代码中有几个保护的纯虚函数，这几个接口主要是在具体的下拉框类中实现，而该接口会在父类中被调用，其他public接口都是含有注释的，直接看代码应该也能看懂。

3、列表下拉框

 ///    说明：combobox定制  下拉框为单列数据，支持文本、单选和复选
 class CListPopupComboBox : public CComboBox
 {
     Q_OBJECT

 public:
     CListPopupComboBox(CustomPopupComboBox::ItemType type = CustomPopupComboBox::RadioItem, QWidget * parent = nullptr);
     ~CListPopupComboBox();

 protected:
     virtual bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;

     //新增数据 CComboBox
     virtual void AddItem(const QString & text) Q_DECL_OVERRIDE;
     virtual void ResetItemWidth(int width) Q_DECL_OVERRIDE;
     virtual void ResetItemHeight(int height) Q_DECL_OVERRIDE;

 private:
     virtual void ConstructView();//列表定制
 };

实现了CComboBox类中的3个纯虚接口，主要是重置下拉框项的高度和宽度，还有增加项等接口。列表框增加项代码如下：

 void CListPopupComboBox::AddItem(const QString & text)
 {
     if (QListWidget * listWidget = dynamic_cast<QListWidget *>(m_PopupWidget))
     {
         QWidget * itemWidget = NewItem(text);
         //itemWidget->setStyleSheet(QString("QCheckBox {background-color:lightgray;}"
         //    "QCheckBox:checked{background-color:white;}"));

         itemWidget->setFixedSize(m_ItemWidth, m_ItemHeight);

         int pos = listWidget->count() -  <  ?  : listWidget->count() - ;
         listWidget->insertItem(pos, new QListWidgetItem());
         listWidget->setItemWidget(listWidget->item(pos), itemWidget);
     }
 }

4、表格行表头定制

 ///    说明：table列表头定制
 class CCheckBoxHeaderView : public QHeaderView
 {
     Q_OBJECT
 public:
     CCheckBoxHeaderView(int checkColumnIndex,
         Qt::Orientation orientation,
         QWidget * parent = ) :
         QHeaderView(orientation, parent)
     {
         m_checkColIdx = checkColumnIndex;
     }

 public:
     void UpdateSelectColumn(int);

 signals:
     void SectionClicked(int);

 protected:
     virtual void paintSection(QPainter * painter, const QRect &rect, int logicalIndex) const;
     virtual void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;

 private:
     int m_checkColIdx;
 };

主要实现了表格行表头自绘制，绘制代码在paintSection接口中实现，具体绘制方式如下：

 void CCheckBoxHeaderView::paintSection(QPainter * painter, const QRect &rect, int logicalIndex) const
 {
     QRect r = rect;
     r.setTop(r.top() + );
     r.setLeft(r.left() - );
     painter->fillRect(r, Qt::white);

     if (logicalIndex == )
     {
         r.setTop(r.top() - );
         r.setHeight();
         painter->drawPixmap(rect, QPixmap(QStringLiteral(":/combobox/Resources/bg.png")));
     }

     QString text = model()->headerData(logicalIndex, this->orientation(),
         Qt::DisplayRole).toString();

     painter->setPen(QColor(, , ));
     painter->drawLine(rect.bottomLeft(), rect.bottomRight());

     painter->setPen(QPen(QColor(Qt::red), ));
     if (logicalIndex == m_checkColIdx)
     {

         QLine line(rect.bottomLeft() + QPoint(rect.width() / , ), rect.bottomRight() - QPoint(rect.width() / , ));
         painter->drawLine(line);

         QFont font = painter->font();
         font.setBold(true);
         painter->setFont(font);
     }

     painter->drawText(rect, Qt::AlignCenter, text);
 }

5、表格下拉框

 class CTablePopupComboBox : public CComboBox
 {
     Q_OBJECT

 public:
     CTablePopupComboBox(CustomPopupComboBox::ItemType type = CustomPopupComboBox::CheckBoxItem, QWidget * parent = );
     ~CTablePopupComboBox();

 public:

     //设置列数
     void SetTableColumn(int column);
     void SetHorizontalHeaderLabels(const QStringList & headerNames);

     //设置下拉框属性
     void SetItemWidth(int width);
     void SetItemHeight(int height);

     //设置表头是否可见
     void SetHorizontalHeaderVisible(bool visible);

     void CompletedData();

 protected:
     virtual bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;

     virtual void AddItem(const QString & text) Q_DECL_OVERRIDE;//新增数据
     virtual void ResetItemWidth(int width) Q_DECL_OVERRIDE;
     virtual void ResetItemHeight(int height) Q_DECL_OVERRIDE;
     virtual void CompleteItems();//补齐没有填充完的行  防止combobox的view接手鼠标事件

     virtual void ColumnHeaderClicked(int column);//列表头被点击处理

 private slots:
     void HeaderClicked(int index);

 private:
     virtual void ConstructView();//表格定制

 private:
     //定制项信息    //表格
     int m_TableColumnCount = ;
 };

表格下拉框比列表下拉框复杂，它除了实现列表下拉框的接口外还实现了额外的接口，比如支持列表头和行表头的显示，并支持滚动条的显示等，这个表格下拉框实现起来没有那么完善，其中不乏有大量的bug，如果有同学发现了什么解决不了的问题可以私信我，或许这个bug我已经在项目中修正了，但是demo就没有时间修改。

6、行表头定制

 ///    说明：table列表头定制
 class CTableRowHeaderView : public QHeaderView
 {
     Q_OBJECT
 public:
     CTableRowHeaderView(QWidget * parent = ) :
         QHeaderView(Qt::Vertical, parent)
     {
     }

 protected:
     virtual void paintSection(QPainter * painter, const QRect &rect, int logicalIndex) const;

 private:
 };

7、城市列表下拉框

 ///    说明：城市选择下拉框 支持行表头显示  不支持滚动条显示
 class CCityComboBox : public CTablePopupComboBox
 {
     Q_OBJECT

 public:
     CCityComboBox(QWidget *parent);
     ~CCityComboBox();

 public:
     void SetVerticalHeaderLabels(const QStringList & headerNames);//设置表头列显示数据  不建议主动设置
     void SetVerticalHeaderWidth(int width);//设置表头列宽度
     void SetVerticalHeaderVisible(bool visible);//设置表头列是否可见

     ///***********************************///     ///    说明：设置当前默认添加城市分组  配合AddText(AddTexts)一起使用   单次添加的数据  最后必须调用CompletedData接口
     ///***********************************///
     void SetCurrentCityKey(char key){ m_CurrentCityKey = QChar(key).toLower().toLatin1(); }
     void CompletedData();

     ///***********************************///     ///    说明：设置当前城市分组
     ///***********************************///
     void SetCistyMaps(const std::map < char, std::list<QString> > & citys);

 protected:
     virtual void AddItem(const QString & text);
     virtual void ColumnHeaderClicked(int column);

 private slots:

 private:
     void InitializeUI();
     void FillData();//填充数据
     int ResetTableData(int column);//根据点击列重置表格数据

 private:
     bool m_NeedFixedHeight = true;
     char m_CurrentCityKey = 'a';
     int m_CurrentDisplayColumnOrder = ;
     int m_VerticalHeaderWidth = ;
     QStringList m_VerticalHeaderName;
     std::map< char, std::list<QString> > m_CitysMap;//按字母存储的城市列表
     std::map < int, std::list<int> > m_RowsMap;//以列为键存储所在行
 };

本篇文章的核心主要是想讲解这个类，该类可以实现上述列表下拉框和表格下拉框的功能，只需要调用相应的接口就可以，比如说列表下拉框，那么我只需要调用隐藏行和列表头，并把列设置为一列即可。

这个城市列表框其实也是在Qt之QComboBox定制文章中重构过来的，虽然接口类似，但是内部的实现细节有了不小的变化，就比如这个表格下拉框在列表头点击切换功能实现时，我改变了数据的存储模式，以前都是把数据删除重新添加，但是现在我是把所有数据都添加在表格中，而根据所需要显示的行进行show，而其他行直接hide，这样不仅实现起来方便而且不需要维护大量的缓存数据。

在这篇文章最开始的效果展示图中就能看到，下拉框有一部分是透明的了，这个其实也是我想实现的功能的一部分，主要是想实现一个带有小三角的下拉框，按照上述的方式应该也是能够实现，关于这个下拉框北京透明我也是搞了好久才搞明白，其实只要简单的几行代码就可以，代码如下：

 if (QWidget * parent = m_ComboBox->view()->parentWidget())
     {
     //    parent->installEventFilter(this);
         parent->setAttribute(Qt::WA_TranslucentBackground);
         parent->setWindowFlags(Qt::Popup | Qt::FramelessWindowHint);
     }

只需要获取下拉框的顶层父类，然后设置其属性并设置其窗口风格即可，可是就这么几句话，不设置根本不能够实现背景色透明。所以看到这个信息的同学真是幸福。

城市表格下拉框的使用方式也比较简单，在添使用AddText加完数据之后需要调用CompletedData接口类告诉该类数据添加完毕；如果调用SetCistyMaps接口设置数据，则不需要，demo中使用方式如下：

 CCityComboBox w3(&p);

     w3.SetItemType(CustomPopupComboBox::LabelItem);
     w3.SetHorizontalHeaderLabels(QStringList() << QStringLiteral("ABCDEF") << QStringLiteral("GHIJ")
         << QStringLiteral("KLMN")
         << QStringLiteral("PQRSTUVM")
         << QStringLiteral("XYZ"));
     w3.SetVerticalHeaderLabels(QStringList() << QStringLiteral("A") << QStringLiteral("B")
         << QStringLiteral("C")
         << QStringLiteral("D")
         << QStringLiteral("E"));

     w3.SetHorizontalHeaderVisible(true);
     w3.SetVerticalHeaderVisible(true);
     w3.setFixedSize(, );
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));
     w3.AddText(QStringLiteral("a"));

     w3.SetCurrentCityKey('B');
     w3.AddText(QStringLiteral("b"));
     w3.AddText(QStringLiteral("b"));
     w3.AddText(QStringLiteral("b"));
     w3.AddText(QStringLiteral("b"));
     w3.AddText(QStringLiteral("b"));
     w3.SetCurrentCityKey('C');
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.AddText(QStringLiteral("cC"));
     w3.SetCurrentCityKey('M');
     w3.AddText(QStringLiteral("m"));
     w3.AddText(QStringLiteral("m"));
     w3.AddText(QStringLiteral("m"));
     w3.AddText(QStringLiteral("m"));
     w3.AddText(QStringLiteral("m"));
     w3.CompletedData();

本篇文章我只讲述了实现这样一个下拉框所需要的接口文件，而具体的实现我没有拉出来将，因为我觉着这个和上一篇文章中的实现类似，只是在接口上有比较大的重构。在写这篇文章的时候其实我就有一个想法，我应该还会写关于下拉框定制的第三篇文章，而这第三篇文章主要讲的还是怎么实现一个下拉框，但是走的完全是和现在不一样的路线。因为最近项目真的非常的紧张，根本没有时间去写和测试相关的demo，不过后边如果有时间我会尽快补上。

关于全新的下拉框定制，我的想法是完全定制一个下拉框，而不是重写QComboBox，这样的话可以省去很多的麻烦，比如：下拉框的大小，下拉框的视图位置等问题，说到这儿，我突然想起来这个demo的一个bug，那就是在表格下拉框出现下拉框滚动条的时候，如果在滚动了垂直滚动条之后隐藏下拉框，那么下次展示下拉框窗口时，视图会显示不正确，这个问题我自己已经解决了，但是没有在demo体现，解决办法是：在隐藏下拉框窗口时，把其视图滚动到顶端，实现代码如下：

 bool CTablePopupComboBox::eventFilter(QObject * watched, QEvent * event)
 {
     if (m_BottomWidget && m_BottomWidget == watched)
     {
         if (QMouseEvent * mouseEvent = static_cast<QMouseEvent *>(event))
         {
             if (mouseEvent->type() == QEvent::MouseButtonPress
                 || mouseEvent->type() == QEvent::MouseButtonRelease)
             {
                 return true;
             }
         }
     }
     else if (watched == m_ComboBox->view()->parentWidget()
         && event->type() == QEvent::Hide)
     {
         if (QTableWidget * tableWidget = dynamic_cast<QTableWidget *>(m_PopupWidget))
         {
             tableWidget->scrollToTop();
         }
     }

     return QWidget::eventFilter(watched, event);
 }

注意：这个demo比较粗糙，如果有问题的同学可以私聊我，不管是建议还是问题我都会认真的回答

demo下载链接：http://download.csdn.net/detail/qq_30392343/9608629

如果您觉得文章不错，不妨给个打赏，写作不易，感谢各位的支持。您的支持是我最大的动力，谢谢！！！ 

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奋斗中的无名小卒。。。