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Qt 简单写一个TreeView,控制图层

作者：IT小白 | 2024-03-23 20:21:43

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Qt 简单写一个TreeView,控制图层

背景:

近期要用Qt写一个 加载渲染激光点云的小工具软件, 对于这种软件来说,首先要有一个图层树来方便控制.因而做了一个小demo来记录一下;

效果展示:

要完成的功能: 增,删,改,查,收起,以及展开的操作效果.以及对自己定义

 实现过程:

1.先定义自己的数据结构:

  1. #include <iostream>
  2. #include <list>
  3. /// <summary>
  4. /// Tree 基础图元
  5. /// </summary>
  6. class IXPloteTreeItem
  7. {
  8. public:
  9.  
  10.     IXPloteTreeItem();
  11.     ~IXPloteTreeItem();
  12.     static long XPloteNumsID;//全局的ID
  13.     void SetData(const std::string& name);
  14.     int GUID;
  15.     std::string gName{ "" };
  16.     std::shared_ptr<std::list<IXPloteTreeItem>> gChilds{ nullptr };
  17.     std::string toString() const;
  18. };
  19.

2.定义TreeStandItem,来包裹自己的结构

 XPloteStandardItem.h头文件.

  1. #include <qstandarditemmodel.h>
  2. #include "IXPloteTreeItem.h"
  3.  
  4. /// <summary>
  5. /// 创建自己的QstandItem 子项目.
  6. /// </summary>
  7. class XPloteStandardItem :public QStandardItem
  8. {
  9. public:
  10.  
  11. 	using QStandardItem::QStandardItem;
  12. 	XPloteStandardItem() :QStandardItem() {
  13. 	
  14. 		InitData();
  15. 	
  16. 	}
  17. 	XPloteStandardItem(const QString& str) :QStandardItem(str) 
  18. 	{
  19. 		InitData();
  20. 		gTreeData->gName = str.toStdString().c_str();
  21. 	}
  22. 	~XPloteStandardItem();
  23. 	std::shared_ptr<IXPloteTreeItem> gTreeData{ nullptr };
  24.  
  25. private:
  26.  
  27. 	void InitData();
  28.  
  29. };
  30.  
  31.

 XPloteStandardItem.cpp文件

  1. #include "XPloteStandardItem.h"
  2. #include <memory>
  3. XPloteStandardItem::~XPloteStandardItem()
  4. {
  5.  
  6. }
  7.  
  8. void XPloteStandardItem::InitData()
  9. {
  10. 	if(gTreeData==nullptr) gTreeData = std::make_shared<IXPloteTreeItem>();
  11. 	this->setCheckable(true);
  12. 	this->setCheckState(Qt::Checked);
  13. 	this->setEditable(false);
  14. }

3.UI上面我就不写了,随便拖一个TreeView控件上去,主要是下面的关键代码以及实现过程:

 QtTree.h 类头文件

  1. /// <summary>
  2. /// 主窗体函数.
  3. /// </summary>
  4. class QtTree : public QMainWindow
  5. {
  6.     Q_OBJECT
  7.  
  8. public:
  9.  
  10.     QtTree(QWidget *parent = nullptr);
  11.     
  12.     ~QtTree();
  13.  
  14.     void InitSource();
  15.  
  16. public slots:
  17.  
  18.     void on_treeView_customContextMenuRequested(const QPoint &pos);
  19.  
  20. private:
  21.  
  22.     Ui::QtTreeClass ui;
  23.     QMenu* menu;
  24.     QStandardItemModel* model;
  25.     QStandardItem* rootItem1;
  26.     QStandardItem* rootItem2;
  27. };

 QtTree.cpp实现部分:

  1. #include "QtTree.h"
  2. #include <QMessageBox>
  3.  
  4. QtTree::QtTree(QWidget *parent)
  5.     : QMainWindow(parent)
  6. {
  7.     ui.setupUi(this);
  8.     InitSource();
  9. }
  10.  
  11. QtTree::~QtTree()
  12. {
  13.  
  14.  
  15. }
  16.  
  17. void PrintLog(const std::string& str)
  18. {
  19.     QMessageBox::information(nullptr,"",str.c_str());
  20. }
  21. void PrintLog(QString str)
  22. {
  23.     QMessageBox::information(nullptr, "", str);
  24. }
  25.  
  26. void QtTree::InitSource()
  27. {
  28.  
  29.     ui.treeView->setContextMenuPolicy(Qt::CustomContextMenu);
  30.     //添加右键菜单...
  31.     QString qss = "QMenu{color:#E8E8E8;background:#4D4D4D;margin:2px;}\
  32.                 QMenu::item{padding:3px 20px 3px 20px;}\
  33.                 QMenu::indicator{width:13px;height:13px;}\
  34.                 QMenu::item:selected{color:#E8E8E8;border:0px solid #575757;background:#1E90FF;}\
  35.                 QMenu::separator{height:1px;background:#757575;}";      //设置样式表
  36.     menu = new QMenu(ui.treeView);
  37.     menu->setStyleSheet(qss);                                         //给菜单设置样式
  38.     QAction* a1 = new QAction(QStringLiteral("增加"));
  39.     menu->addAction(a1);   
  40.     connect(a1, &QAction::triggered, this, [&]() {
  41.         
  42.         QModelIndex curIndex = ui.treeView->currentIndex();
  43.         if (curIndex.isValid())
  44.         {
  45. #if 0
  46.             auto parentIndex = curIndex.parent();
  47.             if (parentIndex.isValid())
  48.             {
  49.                 auto parentItem = model->itemFromIndex(parentIndex);
  50.                 if (parentItem != nullptr)
  51.                 {
  52.                     parentItem->appendRow(new QStandardItem(QStringLiteral("城市_%1").arg(model->rowCount())));
  53.                 }
  54.             }
  55.             else
  56.             {
  57.                 //model
  58.                 model->appendRow(new QStandardItem(QStringLiteral("城市_%1").arg(model->rowCount())));
  59.             }
  60.  
  61. #else
  62.  
  63.             auto curItem = model->itemFromIndex(curIndex);
  64.             if (curItem != nullptr)
  65.             {
  66.                 auto item = new XPloteStandardItem(QStringLiteral("城市_%1").arg(model->rowCount()));
  67.                 item->setCheckable(true);
  68.                 item->setCheckState(Qt::Checked);
  69.                 curItem->appendRow(item);
  70.             }
  71.  
  72.  
  73. #endif // 0
  74.  
  75.  
  76.         }
  77.         
  78.         
  79.         });   
  80.    
  81.   
  82.     QAction* a2 = new QAction(QStringLiteral("查看"));
  83.     menu->addAction(a2);
  84.     connect(a2, &QAction::triggered, this, [&]() {
  85.  
  86.         QModelIndex curIndex = ui.treeView->currentIndex();
  87.         if (curIndex.isValid())
  88.         {
  89.         
  90.             auto curItem = static_cast<XPloteStandardItem*>((model->itemFromIndex(curIndex)));
  91.             if (curItem != nullptr)
  92.             {
  93.                 QString info;
  94.                 info.append(curItem->text());//获取当前文本.
  95.                 info.append(QStringLiteral("\r\n状态: %1\r\n").arg(curItem->checkState()));
  96.                 info.append(QStringLiteral("自己的数据(IXPloteTreeItem): %1").arg(curItem->gTreeData->toString().c_str()));
  97.                 PrintLog(info);
  98.             }
  99.         
  100.         }
  101.       
  102.         });
  103.  
  104.     QAction* a5 = new QAction(QStringLiteral("展开"));
  105.     menu->addAction(a5);
  106.     connect(a5, &QAction::triggered, this, [&]() {
  107.  
  108.         QModelIndex curIndex = ui.treeView->currentIndex();
  109.         if (curIndex.isValid())
  110.         {
  111.             ui.treeView->expand(curIndex);
  112.         }
  113.  
  114.         });
  115.  
  116.     QAction* a6 = new QAction(QStringLiteral("收起"));
  117.     menu->addAction(a6);
  118.     connect(a6, &QAction::triggered, this, [&]() {
  119.  
  120.         QModelIndex curIndex = ui.treeView->currentIndex();
  121.         if (curIndex.isValid())
  122.         {
  123.             ui.treeView->collapse(curIndex);
  124.         }
  125.  
  126.         });
  127.  
  128.     QAction* a3 = new QAction(QStringLiteral("修改"));
  129.     menu->addAction(a3);
  130.     connect(a3, &QAction::triggered, this, [&]() {
  131.  
  132.         QModelIndex curIndex = ui.treeView->currentIndex();
  133.         if (curIndex.isValid())
  134.         {
  135.  
  136.             auto curItem = static_cast<XPloteStandardItem*>((model->itemFromIndex(curIndex)));
  137.             if (curItem != nullptr)
  138.             {
  139.                 QString str = QStringLiteral("天朝");
  140.                 curItem->gTreeData->gName = str.toStdString();
  141.                 curItem->setText(str);
  142.                 PrintLog(QStringLiteral("修改完成"));
  143.             }
  144.  
  145.         }
  146.  
  147.         });
  148.  
  149.     QAction* a4 = new QAction(QStringLiteral("删除"));
  150.     menu->addAction(a4);
  151.     connect(a4, &QAction::triggered, this, [&]() {
  152.  
  153.         QModelIndex curIndex = ui.treeView->currentIndex();
  154.         if (curIndex.isValid())
  155.         {
  156.             auto parentIndex = curIndex.parent();
  157.             if (parentIndex.isValid())
  158.             {
  159.                 auto parentItem = model->itemFromIndex(parentIndex);
  160.                 parentItem->removeRow(curIndex.row());
  161.             }
  162.             else
  163.             {
  164.                 model->removeRow(curIndex.row());
  165.             }
  166.            
  167.         }
  168.  
  169.         });
  170.     //给菜单添加项
  171.  
  172.  
  173.     //添加一些Tree数据.
  174.     {
  175.         model = new QStandardItemModel(ui.treeView); //指定父对象，便于内存管理
  176.         model->setHorizontalHeaderLabels(QStringList() << QStringLiteral("名称") << QStringLiteral("说明"));
  177.         ui.treeView->setModel(model);//设置数据Model,关键.
  178.  
  179.         rootItem1 = new XPloteStandardItem(QStringLiteral("北京"));
  180.         model->appendRow(rootItem1);
  181.  
  182.         XPloteStandardItem* childItem1_1 = new XPloteStandardItem(QStringLiteral("故宫"));
  183.         rootItem1->appendRow(childItem1_1);
  184.         XPloteStandardItem* childItem1_2 = new XPloteStandardItem(QStringLiteral("子午庙"));
  185.         rootItem1->appendRow(childItem1_2);
  186.         rootItem1->appendRow(new XPloteStandardItem(QStringLiteral("日月潭")));
  187.         rootItem1->appendRow(new XPloteStandardItem(QStringLiteral("中南海")));
  188.  
  189.         rootItem2 = new XPloteStandardItem(QStringLiteral("湖北"));
  190.         model->appendRow(rootItem2);
  191.         //model->setItem(model->indexFromItem(rootItem2).row(), 1, new XPloteStandardItem(QStringLiteral("黄鹤楼")));//设置第二列内容.
  192.  
  193.         XPloteStandardItem* childItem2_1 = new XPloteStandardItem(QStringLiteral("武汉"));
  194.         rootItem2->appendRow(childItem2_1);
  195.         //rootItem2->setChild(childItem2_1->index().row(), 1, new XPloteStandardItem(QStringLiteral("步行街")));//在第二列添加数据.
  196.  
  197.         XPloteStandardItem* childItem2_2 = new XPloteStandardItem(QStringLiteral("园博园")); //注意这里->rootItem2,通过父类设置其所在的行.
  198.         rootItem2->appendRow(childItem2_2);
  199.         //rootItem2->setChild(childItem2_2->index().row(),1,new XPloteStandardItem(QStringLiteral("揽月楼")));
  200.  
  201.         rootItem2->appendRow(new XPloteStandardItem(QStringLiteral("白云寺")));
  202.     }
  203.  
  204. }
  205.  
  206.  
  207. /// <summary>
  208. /// 右键菜单...
  209. /// </summary>
  210. /// <param name="pos"></param>
  211. void QtTree::on_treeView_customContextMenuRequested(const QPoint& pos)
  212. {
  213.     if (ui.treeView->hasFocus()) {
  214.  
  215.         menu->exec(this->mapToGlobal(pos));
  216.     }
  217.   
  218. }

  完整的资源下载链接:

http://链接: https://pan.baidu.com/s/1HCHLJmsvV_5CRhqayFhiXg?pwd=hong 提取码: hong 复制这段内容后打开百度网盘手机App，操作更方便哦 --来自百度网盘超级会员v6的分享

 或者关注公众号 我有一座编码屋     回复 QtTree 即可获取链接

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