Qt QTreeView 加自定义Model实现自定义树形控件_qtreeview model怎么加一个子树-优快云博客

本文介绍了一个基于Qt的文件树控件实现方法。通过自定义Node类来构造树形结构，并结合FileTreeModel和QTreeView展示文件树。文章详细展示了如何创建节点对象并设置不同类型的节点。

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Qt很好很强大，我很喜欢

研究完hello Qt后，开始自己开发一个小东西，Tree控件，

首先是Node类：

node.h

#ifndef NODE_H #define NODE_H class Node { public: enum Type{ Root, FileName }; Node(Type type,const QString &str = ""); ~Node(); Type type; QString str; Node *parent; QList<Node *> children; }; #endif // NODE_H

node.cpp

#include <QtGui> #include "node.h" Node::Node(Type type,const QString &str) { this->type = type; this->str = str; this->parent = 0; } Node::~Node() { qDeleteAll(this->children); }

node对象中包含 root，filename两种类型

widget.h

#ifndef QFILETREEWIDGET_H #define QFILETREEWIDGET_H #include <QTreeView> class Node; class FileTreeModel; class QFileTreeWidget : public QWidget { Q_OBJECT public: QFileTreeWidget(); ~QFileTreeWidget(); //void setMyModel(); private: //QModelIndex index; FileTreeModel *model; QTreeView *view; }; #endif // QFILETREEWIDGET_H

widget.cpp

#include <QtGui> #include "booleanmodel.h" #include "booleanparser.h" #include "booleanwindow.h" BooleanWindow::BooleanWindow() { label = new QLabel(tr("Boolean expression:")); lineEdit = new QLineEdit; booleanModel = new BooleanModel(this); treeView = new QTreeView; treeView->setModel(booleanModel); connect(lineEdit, SIGNAL(textChanged(const QString &)), this, SLOT(booleanExpressionChanged(const QString &))); QGridLayout *layout = new QGridLayout; layout->addWidget(label, 0, 0); layout->addWidget(lineEdit, 0, 1); layout->addWidget(treeView, 1, 0, 1, 2); setLayout(layout); setWindowTitle(tr("Boolean Parser")); } void BooleanWindow::booleanExpressionChanged(const QString &expr) { BooleanParser parser; Node *rootNode = parser.parse(expr); booleanModel->setRootNode(rootNode); }

在main函数中调用

QApplication app(argc, argv); BooleanWindow window; window.show(); return app.exec();