QT C++实现表头添加组件

QTableWidget在表头添加组件#

QTableWidget的表头有一个类QHeaderView是专门处理表头的类，要在表头添加一个类似QCheckBox的组件需要重写一个类并继承QHeaderView。

QTableWidget中添加复选框并实现全选居中：

• 自定义类MyHeaderView并继承QHeaderView
• 自定义类MyTableWidget并继承QTableWidget

myheaderview.h

#ifndef MYHEADERVIEW_H
#define MYHEADERVIEW_H

#include <QHeaderView>
#include <Qt>

class MyHeaderView : public QHeaderView
{
    //Q_OBJECT：使用信号和槽函数必备的宏
public:
    struct Margins
    {
        int left;
        int right;
        int top;
        int buttom;

        Margins(int left = 2, int right = 2, int top = 2, int buttom = 2);  //通过构造函数设置默认参数
    };


    explicit MyHeaderView(Qt::Orientation orientation, QWidget *parent = nullptr);
    ~MyHeaderView();

    void SetItemWidget(int index, QWidget * widget);    //表头添加组件，比如checkbox、pushbutton
    void SetItemMargins(int index, Margins margins);    //设置边距

private:
    struct Item
    {
        QWidget * item;     //组件
        Margins margins;    //边缘

        Item(); //默认构造函数
    };

    QMap<int, Item> mItems;	//<key, data>
};

#endif // MYHEADERVIEW_H

myheaderview.cpp

#include "myheaderview.h"

MyHeaderView::MyHeaderView(Qt::Orientation orientation, QWidget * parent)
    : QHeaderView(orientation, parent)
{

}

MyHeaderView::~MyHeaderView()
{

}

void MyHeaderView::SetItemWidget(int index, QWidget *widget)
{
    widget->setParent(this);
    mItems[index].item = widget;
}

void MyHeaderView::SetItemMargins(int index, Margins margins)
{
    mItems[index].margins = margins;
}

MyHeaderView::Item::Item() : item(nullptr)
{
}

MyHeaderView::Margins::Margins(int left, int right, int top, int buttom) :
    left(left),
    right(right),
    top(top),
    buttom(buttom)
{
}

mytablewidget.h

#ifndef MYTABLEWIDGET_H
#define MYTABLEWIDGET_H
#include <QTableWidget>
#include "myheaderview.h"

class MyTableWidget : public QTableWidget
{
    //Q_OBJECT

public:
    MyTableWidget(QWidget * parent = nullptr);
    ~MyTableWidget();

    void SetHorizontalHeaderItemWidget(int column, QWidget * widget);	//表头添加组件
    void SetHorizontalHeaderItemMargins(int column, MyHeaderView::Margins margins);	//修改表头组件的边距

private:
    MyHeaderView *myheadview;
};

#endif // MYTABLEWIDGET_H

mytablewidget.cpp

#include "mytablewidget.h"

MyTableWidget::MyTableWidget(QWidget * parent)
    : QTableWidget(parent)
{
    myheadview = new MyHeaderView(Qt::Orientation::Horizontal, this);
    setHorizontalHeader(myheadview);        //这里有upcasting
}

MyTableWidget::~MyTableWidget()
{
    delete myheadview;
}

void MyTableWidget::SetHorizontalHeaderItemWidget(int column, QWidget *widget)
{
    myheadview->SetItemWidget(column, widget);
}

void MyTableWidget::SetHorizontalHeaderItemMargins(int column, MyHeaderView::Margins margins)
{
    myheadview->SetItemMargins(column, margins);
}

使用方法：

table->setColumnCount(5);
QCheckBox all_check = new QCheckBox("全选");
table->SetHorizontalHeaderItemWidget(0, all_check);     //在第0列添加一个QCheckBox

效果预览：

参考：https://stackoverflow.com/questions/27000484/add-custom-widgets-as-qtablewidget-horizontalheader