QTreewidget的使用

1 QtreeWidget显示右键菜单

#include "treewidget.h"

#include <QPushButton>
#include <QMenu>

TreeWidget::TreeWidget(QWidget *parent)
  : QMainWindow(parent)
{
  ui.setupUi(this);

  //设置树形控件每一列的名称
  QStringList sl;
  sl << u8"名称";
  ui.treeWidget->setHeaderLabels(sl);

  //treewidget鼠标右键菜单事件，需要在代码手动设置ContextMenuPolicy属性或者在ui文件中设置
  ui.treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
  connect(ui.treeWidget, &QWidget::customContextMenuRequested, this,
          &TreeWidget::ShowContextMenu);

  //为树形控件添加一级结点
  connect(ui.add_first_node_button, &QPushButton::clicked, this,
          &TreeWidget::AddFirstNode);

  //为树形控件添加二级结点
  connect(ui.add_second_node_button, &QPushButton::clicked, this,
          &TreeWidget::AddSecondNode);
}

void TreeWidget::ShowContextMenu(const QPoint &pos)
{
  QMenu *menu = new QMenu(this);
  QTreeWidgetItem *item = ui.treeWidget->itemAt(pos);
  if (item)
  {
    if ((int)TreeItemType::kFisrtNode == item->type())
    {
      QAction *action1 = new QAction(u8"一级结点1", this);
      menu->addAction(action1);
      QAction *action2 = new QAction(u8"一级结点2", this);
      menu->addAction(action2);
      QAction *action3 = new QAction(u8"一级结点3", this);
      menu->addAction(action3);
    }
    else if ((int)TreeItemType::kSecondNode == item->type())
    {
      QAction *action1 = new QAction(u8"二级结点1", this);
      menu->addAction(action1);
      QAction *action2 = new QAction(u8"二级结点2", this);
      menu->addAction(action2);
      QAction *action3 = new QAction(u8"二级结点3", this);
      menu->addAction(action3);
    }
  }
  else
  { //在空白处点击，没有选中QTreeWidgetItem
    QAction *action1 = new QAction(u8"空白结点1", this);
    menu->addAction(action1);
    QAction *action2 = new QAction(u8"空白结点2", this);
    menu->addAction(action2);
    QAction *action3 = new QAction(u8"空白结点3", this);
    menu->addAction(action3);
  }

  menu->exec(QCursor::pos());
}

2 QtreeWidget添加结点

void TreeWidget::AddFirstNode()
{
  QTreeWidgetItem *node = new QTreeWidgetItem(ui.treeWidget,
      (int)TreeItemType::kFisrtNode);
  QString text = QString::number(++node_sequence_);
  node->setText(0, text);
  ui.treeWidget->addTopLevelItem(node);
}

void TreeWidget::AddSecondNode()
{
  QTreeWidgetItem *it = ui.treeWidget->currentItem();
  if (!it)
  {
    return;
  }
  QTreeWidgetItem *item = new QTreeWidgetItem(it, (int)TreeItemType::kSecondNode);
  item->setText(0,u8"二级结点");
  it->addChild(item);
}

3 QtreeWidget删除结点

void TreeWidget::DeleteNode()
{
  QTreeWidgetItem *item = ui.treeWidget->currentItem();
  if (!item)
  {
    return;
  }
  if ((int)TreeItemType::kFisrtNode == item->type())
  {
    int index = ui.treeWidget->indexOfTopLevelItem(item);
    ui.treeWidget->takeTopLevelItem(index);
  }
  else if ((int)TreeItemType::kSecondNode == item->type())
  {
    ui.treeWidget->removeItemWidget(item, 0);
    delete item;
  }
}

 效果如下图：

 代码源码下载（treewidget文件夹）：git@github.com:Mr-jiayunfei/qt_code.git