1、概述
源码放在文章末尾

该项目基于QTabWidget和QTabBar实现了灵活的标签工具栏，主要包含如下功能：
1、标签栏可以收起，可以展开
2、可以在标签栏中添加新的标签界面
3、可以从标签工具栏中把界面拖出来，也可以拖回去
4、关闭拖出来的界面会自动回到标签工具栏
5、可以调换标签工具栏中界面的顺序

项目demo演示如下所示：

使用方式：
1、创建标签栏对象

TabBarPlugin* tabBarPlugin = new TabBar();

2、把标签栏放入布局

ui.centralWidget->layout()->addWidget(tabBarPlugin->getWidget());

3、在标签栏中添加多个界面

tabBarPlugin->addWidget(widget1, "testDemo1", QIcon());
tabBarPlugin->addWidget(widget2, "testDemo2", QIcon());
tabBarPlugin->addWidget(widget3, "testDemo3", QIcon());

项目部分代码如下所示：

#pragma once#include <QTabWidget>
//#include "ui_CustomTabWidget.h"
#include "CustomTabBar.h"/*** @brief 自定义TabWidget* @details setTabBar为protected接口，要修改tabbar就得继承下*  如果标签页关闭后会释放*  因此只需要删除tab不关闭窗口时需要调用 remove，clear*  因此需要删除tab同时关闭窗口时需要调用 close* *  保存弹出的widget指针，因为弹出的窗口有时候不会关闭，可能会导致重复添加*  在窗口弹出的时候添加到m_QLPopedPage，在窗口恢复以及关闭的时候从m_QLPopedPage移除*  当删除标签页的时候，判断是否为弹出的，弹出的不删除*  当添加标签页的时候，判断是否为弹出的，弹出的不添加**  If the tab is closed, it will be released*  You only need to delete the tab without closing the window. You need to call remove, clear*  When you need to delete the tab and close the window, you need to call close**  Save the pop-up widget pointer, because the pop-up window will not be closed sometimes, which may lead to repeated addition*  Add to m_QLPopedPage when the window pops up, and remove from m_QLPopedPage when the window restores and closes*  When deleting a tab, judge whether it is pop-up, and the pop-up will not be deleted*  When adding a tab, judge whether it is pop-up, and do not add the pop-up* */class CustomTabWidget : public QTabWidget
{Q_OBJECTpublic:CustomTabWidget(QWidget *parent = nullptr);~CustomTabWidget();public:// add a page  int addTab(QWidget* page);int addTab(QWidget* page, const QString&);int addTab(QWidget* page, const QIcon& icon, const QString& windowTitle);//Add a page that cannot be closed and dragged out//appendNormalPage+setFixedPagevoid addFixedTab(QWidget* page);//void addFixedTab(QWidget* page, const QString&);//Set that a page cannot be closed and dragged outvoid setFixedTabPage(QWidget* page);void setFixedTabPage(int index);// Remove a page and do not close itvoid removeTab(QWidget* page);void removeTab(int index);// Remove current pagevoid removeCurrentTab();//Clear all pages (no include fixed pages), only the tabs on the tabbar will be cleared, and the pop-up will not be clearedvoid clearTab();//Clear all pages (include fixed pages), only the tabs on the tabbar will be cleared, and the pop-up will not be clearedvoid clearAllTab();// tab is validbool isTabPageValid(int index) const;bool isTabPageValid(QWidget* page) const;// Check whether a page has popped up//bool isTabPagePoped(int index) const;bool isTabPagePoped(QWidget* page) const;// Move a page from the tab and record the widget pointer to the pop-up listvoid popTab(QWidget* page);// Pop up a page and create a new window to place the widgetvoid popPage(QWidget* page);// Set whether the label can be closed, and connect the signal and slot when it can be closedvoid setTabsClosable(bool flag);signals:void updateTabWidgetPage(QTabWidget*);private slots:void isDialogIntoTabBar(QPoint point, QDialog* dialog);protected:void showEvent(QShowEvent* event);void mousePressEvent(QMouseEvent* event) override;void mouseMoveEvent(QMouseEvent* event) override;
private:CustomTabBar* m_pBar = nullptr;void initTabBar();private://Ui::CustomTabWidgetClass ui;// Save tab pages that cannot be dragged out (such as home page)QList<QWidget*> m_QLfixedPage;// Save the dragged tabQList<QWidget*> m_QLPopedPage;
};

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