1

我的项目需要您的宝贵知识；）我需要制作一棵至少有 3 列的树。我所拥有的是一个“操作”列表，如下所示：

typedef struct Action
{
    int ID;
    int parentID;
    char* ident;
    char* text;
}

“动作”列表 (pListActions) 如下所示：

ID  ParentID     ident              text
1   0           "root"        "this is my root"
2   1           "element1"    "1st element"
3   1           "element2"    "2nd element"
4   0           "root2"       "this is another root"
...
...

我可以用我的代码生成相应的树：

ID      ident       text

1
|-2
|-3
4

如您所见，我只有第一列，但我需要其他列。我尝试过使用 setItem 方法，但我不知道如何找到正确的行……事实上，我需要将一行的所有内容“链接”在一起；如果我插入一个新行，我想保持 ID 和相应的 ident/text 之间的链接。

我生成树的代码（第一列）：

QStandardItemModel *standardModel = new QStandardItemModel; //My model for the tree
standardModel->setColumnCount(3);
QStandardItem *rootNode = standardModel->invisibleRootItem();

for (auto it=std::begin(*this->pListActions);it!=std::end(*this->pListActions);it++) //I add all the elements in my list of actions
    {
        Action* pa = *it;
        QStandardItem *myNewItem= new QStandardItem(QString::number(pa->ID));   //The new item ID
        myNewItem->setCheckable(1);

    //Looking for a potential parent (with the action->parentID value
    //FindItemParent is the index of the element il the standardModel with the same ID as the current parentID (only one or zero because the ID is unique)
        QModelIndexList FindItemParent= standardModel->match(standardModel->index(0,0),Qt::DisplayRole,QVariant::fromValue(QString::number(pa->parentID)),2,Qt::MatchRecursive);

        if(!FindItemParent.empty())//If a parent exists
        {
            standardModel->itemFromIndex(FindItemParent.front())->appendRow(myNewItem);//add the current item to the parent in the standardModel

        }
        else {  //No parents
            rootNode->appendRow(myNewItem); //add the element to the root

        }
    }
    //drawing the tree
    QTreeView *tree = new QTreeView;    //Arbre affiché à l'aide du QTreeView
    tree->setModel(standardModel);
    tree->expandAll();
    tree->show();

我想要的最终结果是：

ID      ident       text
1       root        this is my root
|-2     element1    1st element
|-3     element2    2nd element
4       root2       this is another root
4

1 回答 1

0

我终于找到了如何使用更简单的 QTreeWidget 来做到这一点。这是如何做到的：

QTreeWidget *finalTree = new QTreeWidget;   
finalTree->setColumnCount(3);
QTreeWidgetItem *root = new QTreeWidgetItem;    //Racine de la séquence
root->setText(0,"ROOT");
finalTree->addTopLevelItem(root);

for (auto it=std::begin(*this->pListActions);it!=std::end(*this->pListActions);it++)
{
    Action* pa = *it; 
        QTreeWidgetItem *myNewItem = new QTreeWidgetItem;   
        myNewItem->setText(0,QString::number(pa->ID)); 
        myNewItem->setText(1,pa->ident);
        myNewItem->setText(1,pa->type);


        QList<QTreeWidgetItem*> foundAParent;
        foundAParent = finalTree->findItems(QString::number(pa->parentID),Qt::MatchContains | Qt::MatchRecursive,0);
        if (!foundAParent.empty())
        {
            foundAParent.front()->addChild(myNewItem);
        }
        else
        {
            root->addChild(myNewItem);
        }
        finalTree->addTopLevelItem(root);
}


finalTree->show();
于 2015-06-11T08:17:16.460 回答