如何在 QTreeWidget 中为子代创建子代？

Question

我想这样做，以便我可以将第三级（子子级）扩展到顶级项目（根）下的子级。我所能做的就是让多个孩子成为一个根。

这是在我的 .cpp 中

    QStringList string1, string2;
    string1 << "xxxxxxxx" << "xxxxxxxxxxx";
    string2 << "yyyyyy" << "yy";

    m_treeWidget->insertTopLevelItem(0, new QTreeWidgetItem(string1));
    m_treeWidget->insertTopLevelItem(1, new QTreeWidgetItem(string2));


    //here I add a child
    AddChild(m_treeWidget->topLevelItem(0),"hello","world", m_treeWidget);

    //here I make two attempts to make a sub child
    AddChild(m_treeWidget->itemBelow(m_treeWidget->topLevelItem(0)),"hello_sub1","world_sub1", m_treeWidget);
    AddChild(m_treeWidget->itemAt(0,0),"hello_sub2","world_sub2", m_treeWidget);

以下是我在同一个 .cpp 文件中的添加子方法：

    void Dialog::AddChild (QTreeWidgetItem *parent, QString name, QString Description, QTreeWidget* treeWidget)
    {
         QTreeWidgetItem *item = new QTreeWidgetItem(treeWidget);
         item->setText(0,name);
         item->setText(1, Description);
         parent->addChild(item);
    }

Answer 1

其实我可以用另一种方式解决它...

在.cpp中：

    //Initialize the QTreeWidget with 2 columns

    QTreeWidget m_treeWidget = new QTreeWidget();
    m_treeWidget->setColumnCount(2);

    //these are the method calls:

    AddRoot("Root1_Column1", "Root2_Column2", m_treeWidget);
    AddRoot("Root2_Column1", "Root2_Column2", m_treeWidget);

    //topLevelItem(0) makes it a child of the first root... topLevelItem(1) makes it a child of the second root
    AddChild(m_treeWidget->topLevelItem(0),"Child1_Column1","Child1_Column2"); 
    AddChild(m_treeWidget->topLevelItem(1),"Child2_Column1","Child2_Column2");

    AddSubChild(m_treeWidget->itemBelow(m_treeWidget->topLevelItem(0)),"SubChild_Column1", "SubChild_Column2");

这些是我在同一个 .cpp 文件中使用的方法：

    void Dialog::AddRoot (QString name, QString Description, QTreeWidget* treeWidget)
    {
       QTreeWidgetItem *item = new QTreeWidgetItem(treeWidget);
       item->setText(0,name);
       item->setText(1,Description);
       item->setExpanded(true); //expand automatically
       treeWidget->addTopLevelItem(item);
    }

    void Dialog::AddChild (QTreeWidgetItem *parent, QString name, QString Description)
    {
       QTreeWidgetItem *item = new QTreeWidgetItem();
       item->setText(0,name);
       item->setText(1, Description);
       parent->addChild(item);
    }

    void Dialog::AddSubChild (QTreeWidgetItem *parent, QString name, QString Description)
    {
       QTreeWidgetItem *item = new QTreeWidgetItem();
       item->setText(0,name);
       item->setText(1, Description);
       parent->addChild(item);
    }

Answer 2

为了创建树层次结构，您可以使用QTreeWidgetItem 的API，尤其是它的构造函数。构造函数可以接受QTreeWidget 或QTreeWidgetItem 作为父对象。在第一种情况下，顶级项目将添加到树小部件中，在第二种情况下 - 另一个项目的子项目。此 API 更易于使用，因为您不需要将项目显式附加到树小部件。下面是实现这个想法的示例代码：

QStringList string1, string2;
string1 << "xxxxxxxx" << "xxxxxxxxxxx";
string2 << "yyyyyy" << "yy";

QTreeWidget tv;

// The top level items
QTreeWidgetItem *top1 = new QTreeWidgetItem(&tv, string1);
QTreeWidgetItem *top2 = new QTreeWidgetItem(&tv, string2);

// A child item.
QTreeWidgetItem *child1 =
               new QTreeWidgetItem(top1, QStringList() << "Hello" << "World");

// The grandchildren.
new QTreeWidgetItem(child1, QStringList() << "Hello_sub1" << "World_sub1");
new QTreeWidgetItem(child1, QStringList() << "Hello_sub2" << "World_sub2");