相关资料：
https://blog.csdn.net/xdw_it/article/details/80973144
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 MainWindow::MainWindow(QWidget *parent)
5 : QMainWindow(parent)
6 , ui(new Ui::MainWindow)
7 {
8 ui->setupUi(this);
9 setWindowTitle(QStringLiteral("QTreeView做出复选框功能"));
10
11 m_publicIconMap[QStringLiteral("treeItem_Project")] = QIcon(QStringLiteral(":/new/image/image/Project.png"));
12 m_publicIconMap[QStringLiteral("treeItem_folder")] = QIcon(QStringLiteral(":/new/image/image/folder.png"));
13 m_publicIconMap[QStringLiteral("treeItem_folder-ansys")] = QIcon(QStringLiteral(":/new/image/image/folder-ansys.png"));
14 m_publicIconMap[QStringLiteral("treeItem_group")] = QIcon(QStringLiteral(":/new/image/image/group.png"));
15 m_publicIconMap[QStringLiteral("treeItem_channel")] = QIcon(QStringLiteral(":/new/image/image/channel.png"));
16
17 QStandardItemModel* model = new QStandardItemModel(ui->treeView);
18 model->setHorizontalHeaderLabels(QStringList()<<QStringLiteral("项目名")<<QStringLiteral("信息"));
19 QStandardItem* itemProject = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_Project")],QStringLiteral("项目"));
20 model->appendRow(itemProject);
21 model->setItem(model->indexFromItem(itemProject).row(),1,new QStandardItem(QStringLiteral("项目信息说明")));
22 QStandardItem* itemFolder = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_folder")],QStringLiteral("文件夹1"));
23 itemProject->appendRow(itemFolder);
24 itemProject->setChild(itemFolder->index().row(),1,new QStandardItem(QStringLiteral("信息说明")));
25 itemFolder = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_folder")],QStringLiteral("文件夹2"));
26 itemProject->appendRow(itemFolder);
27 for(int i=0;i<5;++i)
28 {
29 QStandardItem* itemgroup = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_group")],QStringLiteral("组%1").arg(i+1));
30 itemFolder->appendRow(itemgroup);
31 for(int j=0;j<(i+1);++j)
32 {
33 QStandardItem* itemchannel = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_channel")],QStringLiteral("频道%1").arg(j+1));
34 itemgroup->appendRow(itemchannel);
35 itemgroup->setChild(itemchannel->index().row(),1,new QStandardItem(QStringLiteral("频道%1信息说明").arg(j+1)));
36 }
37 }
38 itemProject->setChild(itemFolder->index().row(),1,new QStandardItem(QStringLiteral("文件夹2信息说明")));
39 itemProject = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_Project")],QStringLiteral("项目2"));
40 itemProject->setCheckable(true);
41 itemProject->setTristate(true);
42 model->appendRow(itemProject);
43 for(int i =0;i<3;++i)
44 {
45 itemFolder = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_folder")],QStringLiteral("项目2文件夹%1").arg(i+1));
46 itemFolder->setCheckable(true);
47 itemFolder->setTristate(true);
48 QStandardItem* itemFolderDes = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_group")],QStringLiteral("文件夹%1组").arg(i+1));
49 itemProject->appendRow(itemFolder);
50 itemProject->setChild(itemFolder->index().row(),1,itemFolderDes);
51 for(int j=0;j<i+1;++j)
52 {
53 QStandardItem* item = new QStandardItem(m_publicIconMap[QStringLiteral("treeItem_dataItem")],QStringLiteral("项目%1").arg(j+1));
54 item->setCheckable(true);
55 itemFolder->appendRow(item);
56 }
57 }
58 //关联项目属性改变的信号和槽
59 connect(model,&QStandardItemModel::itemChanged,this,&::MainWindow::on_treeItemChanged);
60 //connect(model,SIGNAL(itemChanged(QStandardItem*)),this,SLOT(treeItemChanged(QStandardItem*)));
61 ui->treeView->setModel(model);
62 }
63
64 MainWindow::~MainWindow()
65 {
66 delete ui;
67 }
68
69 void MainWindow::on_treeView_clicked(const QModelIndex &index)
70 {
71 QString sData;
72 QString sDir;
73 QString sfilePath;
74 QString stype;
75 QString sfileName;
76 QString sFromatStr = QStringLiteral("data:%1 \nisDir:%2 \nfilePath:%3 \ntype:%4 \nfileName:%5");
77 sData = index.data().toString();
78 // sDir = QString::number(m_pFileModel->isDir(index));
79 // sfilePath = m_pFileModel->filePath(index);
80 // stype = m_pFileModel->type(index);
81 // sfileName = m_pFileModel->fileName(index);
82
83 ui->textEdit->setText("");
84 ui->textEdit->append(sFromatStr.arg(sData).arg(sDir).arg(sfilePath).arg(stype).arg(sfileName));
85 }
86
87 // brief 测量兄弟节点的情况，如果都选中返回Qt::Checked，都不选中Qt::Unchecked,不完全选中返回Qt::PartiallyChecked
88 // param item
89 // return 如果都选中返回Qt::Checked，都不选中Qt::Unchecked,不完全选中返回Qt::PartiallyChecked
90 Qt::CheckState MainWindow::checkSibling(QStandardItem * item)
91 {
92 //先通过父节点获取兄弟节点
93 QStandardItem * parent = item->parent();
94 if(nullptr == parent)
95 return item->checkState();
96 int brotherCount = parent->rowCount();
97 int checkedCount(0),unCheckedCount(0);
98 Qt::CheckState state;
99 for(int i=0;i<brotherCount;++i)
100 {
101 QStandardItem* siblingItem = parent->child(i);
102 state = siblingItem->checkState();
103 if(Qt::PartiallyChecked == state)
104 return Qt::PartiallyChecked;
105 else if(Qt::Unchecked == state)
106 ++unCheckedCount;
107 else
108 ++checkedCount;
109 if(checkedCount>0 && unCheckedCount>0)
110 return Qt::PartiallyChecked;
111 }
112 if(unCheckedCount>0)
113 return Qt::Unchecked;
114 return Qt::Checked;
115 }
116
117 void MainWindow::on_treeItemChanged(QStandardItem * item)
118 {
119 qDebug() << "on_treeItemChanged";
120
121 if ( item == nullptr )
122 return ;
123 if ( item->isCheckable ())
124 {
125 //如果条目是存在复选框的，那么就进行下面的操作
126 Qt::CheckState state = item->checkState(); //获取当前的选择状态
127 if (item->isTristate())
128 {
129 //如果条目是三态的，说明可以对子目录进行全选和全不选的设置
130 if ( state != Qt::PartiallyChecked )
131 {
132 //当前是选中状态，需要对其子项目进行全选
133 treeItem_checkAllChild ( item , state == Qt::Checked ? true : false );
134 }
135 }
136 else
137 {
138 //说明是两态的，两态会对父级的三态有影响
139 //判断兄弟节点的情况
140 treeItem_CheckChildChanged(item);
141 }
142 }
143 }
144
145 // brief 根据子节点的改变，更改父节点的选择情况
146 // param item
147 void MainWindow::treeItem_CheckChildChanged(QStandardItem * item)
148 {
149 if(nullptr == item)
150 return;
151 Qt::CheckState siblingState = checkSibling(item);
152 QStandardItem * parentItem = item->parent();
153 if(nullptr == parentItem)
154 return;
155 if(Qt::PartiallyChecked == siblingState)
156 {
157 if(parentItem->isCheckable() && parentItem->isTristate())
158 parentItem->setCheckState(Qt::PartiallyChecked);
159 }
160 else if(Qt::Checked == siblingState)
161 {
162 if(parentItem->isCheckable())
163 parentItem->setCheckState(Qt::Checked);
164 }
165 else
166 {
167 if(parentItem->isCheckable())
168 parentItem->setCheckState(Qt::Unchecked);
169 }
170 treeItem_CheckChildChanged(parentItem);
171 }
172
173 // brief 递归设置所有的子项目为全选或全不选状态
174 // param item 当前项目
175 // param check true时为全选，false时全不选
176 void MainWindow::treeItem_checkAllChild(QStandardItem *item, bool check)
177 {
178 if(item == nullptr)
179 return;
180 int rowCount = item->rowCount();
181 for(int i=0;i<rowCount;++i)
182 {
183 QStandardItem* childItems = item->child(i);
184 treeItem_checkAllChild_recursion(childItems,check);
185 }
186 if(item->isCheckable())
187 item->setCheckState(check ? Qt::Checked : Qt::Unchecked);
188 }
189
190 void MainWindow::treeItem_checkAllChild_recursion(QStandardItem * item,bool check)
191 {
192 if(item == nullptr)
193 return;
194 int rowCount = item->rowCount();
195 for(int i=0;i<rowCount;++i)
196 {
197 QStandardItem* childItems = item->child(i);
198 treeItem_checkAllChild_recursion(childItems,check);
199 }
200 if(item->isCheckable())
201 item->setCheckState(check ? Qt::Checked : Qt::Unchecked);
202 }
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