选中所有停靠小部件

Question

我正在尝试创建一个菜单操作，该操作将列出我QMainWindow中的所有停靠点，以减少混乱。在尝试使用迭代器（oops！）进行一些算术之后，我意识到我需要使用来自 this question 的adjacent_iterator之类的东西。问题是，它不会在我的应用程序中编译，因为dockPair没有初始化。我真的不太了解相邻迭代器的实现或限制，并且不确定我是否做错了什么，或者它是否真的适合我的应用程序。

此外，如果有一种比我的方法更容易/更好的方式来列出所有码头，我可以很好地重新实现该功能。

tabify docks：

void mainWindow::tabifyDocks()
{

    // get a list of all the docks
    QList<QDockWidget*> docks = findChildren<QDockWidget*>();

    // first, un-float all the tabs
    std::for_each(docks.begin(), docks.end(), std::bind(&QDockWidget::setFloating, std::placeholders::_1 /* the dock widget*/, false));

    // sort them into dockWidget areas
    QVector<QDockWidget*> topArea, leftArea, rightArea, bottomArea;
    QVector<QVector<QDockWidget*>*> dockAreas;

    dockAreas.push_back(&topArea);
    dockAreas.push_back(&leftArea);
    dockAreas.push_back(&rightArea);
    dockAreas.push_back(&bottomArea);

    std::for_each(docks.begin(), docks.end(), [&] (QDockWidget* dock) 
    {
        if      (dockWidgetArea(dock) ==  Qt::TopDockWidgetArea     )   {topArea.push_back(dock);       this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::TopDockWidgetArea   , dock); dock->setVisible(true);} 
        else if (dockWidgetArea(dock) ==  Qt::LeftDockWidgetArea    )   {leftArea.push_back(dock);      this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::LeftDockWidgetArea  , dock); dock->setVisible(true);}
        else if (dockWidgetArea(dock) ==  Qt::RightDockWidgetArea   )   {rightArea.push_back(dock);     this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::RightDockWidgetArea , dock); dock->setVisible(true);}
        else if (dockWidgetArea(dock) ==  Qt::BottomDockWidgetArea  )   {bottomArea.push_back(dock);    this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::BottomDockWidgetArea, dock); dock->setVisible(true);}
    });

    // then, tab them all       
    for (auto areasItr = dockAreas.begin(); areasItr != dockAreas.end(); areasItr++)
    {
        // within each area, tab all the docks if there are more than 1
        QVector<QDockWidget*> area = **areasItr;
        for (const auto& dockPair : make_adjacent_range(area)) 
        {
            this->tabifyDockWidget(dockPair.first, dockPair.second);
        }
    }
}

编译器错误：

error C2143: syntax error : missing ',' before ':'
error C2530: 'dockPair' : references must be initialized
error C3531: 'dockPair': a symbol whose type contains 'auto' must have an initializer
error C2143: syntax error : missing ';' before '{'

Answer 1

问题是，我尝试使用MSVC2010编译此代码， does not support range-based for loops 。

使用普通for循环的工作代码如下：

void mainWindow::tabifyDocks()
{
    // get a list of all the docks
    QList<QDockWidget*> docks = findChildren<QDockWidget*>();

    // first, un-float all the tabs
    std::for_each(docks.begin(), docks.end(), std::bind(&QDockWidget::setFloating, std::placeholders::_1 /* the dock widget*/, false));

    // sort them into dockWidget areas
    QVector<QDockWidget*> topArea, leftArea, rightArea, bottomArea;
    QVector<QVector<QDockWidget*>*> dockAreas;

    dockAreas.push_back(&topArea);
    dockAreas.push_back(&leftArea);
    dockAreas.push_back(&rightArea);
    dockAreas.push_back(&bottomArea);

    std::for_each(docks.begin(), docks.end(), [&] (QDockWidget* dock) 
    {
        if      (dockWidgetArea(dock) ==  Qt::TopDockWidgetArea     )   {topArea.   push_back(dock);    this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::TopDockWidgetArea   , dock); dock->setVisible(true);}
        else if (dockWidgetArea(dock) ==  Qt::LeftDockWidgetArea    )   {leftArea.  push_back(dock);    this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::LeftDockWidgetArea  , dock); dock->setVisible(true);}
        else if (dockWidgetArea(dock) ==  Qt::RightDockWidgetArea   )   {rightArea. push_back(dock);    this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::RightDockWidgetArea , dock); dock->setVisible(true);}
        else if (dockWidgetArea(dock) ==  Qt::BottomDockWidgetArea  )   {bottomArea.push_back(dock);    this->removeDockWidget(dock); dock->resize(dock->minimumSizeHint());    this->addDockWidget(Qt::BottomDockWidgetArea, dock); dock->setVisible(true);}
    });

    // then, tab them all       
    // definition: areas == top && bottom && etc.. 
    // definition: area == top || bottom || etc...
    for (QVector<QVector<QDockWidget*>*>::iterator areasItr = dockAreas.begin(); areasItr != dockAreas.end(); areasItr++)
    {
        // within each area, tab all the docks if there are more than 1
        QVector<QDockWidget*> area = **areasItr;
        auto areaRange = make_adjacent_range(area);
        for (auto areaItr = areaRange.begin(); areaItr != areaRange.end(); ++areaItr) 
        {
            auto dockPair = *areaItr;
            this->tabifyDockWidget(dockPair.first, dockPair.second);
        }
    }
}