<div id="readability-page-1" class="page"><cite>_SYPark</cite>
 2023. 12. 1. 10:26
 <div>
 Qt를 설치할 때 볼 수 있던 아래와 같은 구조가지는 UI Component를 TreeWidget이라고 합니다. Qt에서 TreeWidget을 사용하는 법에 대해 간단히 소개하려고 합니다.
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 <img src="https://blog.kakaocdn.net/dn/4K5Tr/btsBfhLDL9Z/QgfcvbzeVXOa8l1CZYbEsK/img.png" onerror="this.onerror=null; this.src='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png'; this.srcset='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png';" data-origin-width="952" data-origin-height="632">
 
 
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먼저 UI는 아래와 같이 구성했습니다. 상단에 QTreeWidget 그리고 하단에는 선택한 Item의 Text를 확인할 수 있는 Label과 선택된 Item에 자식 Item을 추가할 수 있는 Insert와 해당 Item을 지울 Delete 버튼입니다.
<figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
 <img src="https://blog.kakaocdn.net/dn/QDjOz/btsBhYxOOSk/pDyLkOVizMwvLBx8UlsRcK/img.png" onerror="this.onerror=null; this.src='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png'; this.srcset='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png';" data-origin-width="534" data-origin-height="632">
 
 
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먼저 간단하게 Header와 몇가지 Item을 추가해보겠습니다.
<pre id="code_1701392019161" data-ke-language="cpp" data-ke-type="codeblock"><code>#include "mainwindow.h"
#include "./ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui-&gt;setupUi(this);

 QTreeWidgetItem* headerItem = new QTreeWidgetItem;
 headerItem-&gt;setText(0, "Name");
 headerItem-&gt;setText(1, "Price");
 ui-&gt;treeWidget-&gt;setHeaderItem(headerItem); // header

 QTreeWidgetItem* Parent = new QTreeWidgetItem(ui-&gt;treeWidget);
 Parent-&gt;setText(0, "Nintendo");

 QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
 Child-&gt;setText(0, "Zelda");
 Child-&gt;setText(1, "70000");
}

MainWindow::~MainWindow()
{
 delete ui;
}</code></pre>
Nintendo라는 부모 Item 아래 Zelda 라는 자식 Item을 추가했습니다.
<figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
 <img src="https://blog.kakaocdn.net/dn/bOm2I6/btsBca7SKyy/d6CxQ5aeOnbuOPgFqiHtQ1/img.png" onerror="this.onerror=null; this.src='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png'; this.srcset='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png';" data-origin-width="534" data-origin-height="632">
 
 
</figure>
여기에 선택된 Item의 Name을 label에 보여주는 Connect를 추가해보겠습니다.
<pre id="code_1701392271791" data-ke-language="cpp" data-ke-type="codeblock"><code>MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui-&gt;setupUi(this);

 QTreeWidgetItem* headerItem = new QTreeWidgetItem;
 headerItem-&gt;setText(0, "Name");
 headerItem-&gt;setText(1, "Price");
 ui-&gt;treeWidget-&gt;setHeaderItem(headerItem); // header

 QTreeWidgetItem* Parent = new QTreeWidgetItem(ui-&gt;treeWidget);
 Parent-&gt;setText(0, "Nintendo");

 QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
 Child-&gt;setText(0, "Zelda");
 Child-&gt;setText(1, "70000");

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemClicked, [&amp;] (QTreeWidgetItem *item, int column) {
 QString sName = item-&gt;text(0);
 ui-&gt;lbTreeItemTitle-&gt;setText(sName);
 });
}</code></pre>
<figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
 <img src="https://blog.kakaocdn.net/dn/B8jRi/btsBfdQf3nm/cAAli7kCTqqt9ZstHRR3f1/img.png" onerror="this.onerror=null; this.src='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png'; this.srcset='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png';" data-origin-width="534" data-origin-height="632">
 
 
</figure>
다음으로 Add Child Item, Delete Item 코드입니다.
<pre id="code_1701393308591" data-ke-language="cpp" data-ke-type="codeblock"><code>MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui-&gt;setupUi(this);

 QTreeWidgetItem* headerItem = new QTreeWidgetItem;
 headerItem-&gt;setText(0, "Name");
 headerItem-&gt;setText(1, "Price");
 ui-&gt;treeWidget-&gt;setHeaderItem(headerItem); // header

 QTreeWidgetItem* Parent = new QTreeWidgetItem(ui-&gt;treeWidget);
 Parent-&gt;setText(0, "Nintendo");

 QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
 Child-&gt;setText(0, "Zelda");
 Child-&gt;setText(1, "70000");

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemClicked, [&amp;] (QTreeWidgetItem *item, int column) {
 QString sName = item-&gt;text(0);
 ui-&gt;lbTreeItemTitle-&gt;setText(sName);
 }); // Display Current Selected Item Name(Column = 0)

 connect(ui-&gt;pb_AddChild, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
 pNewChild-&gt;setText(0, ui-&gt;le_ChildTitle-&gt;text());
 pCurrentSelectedItem-&gt;addChild(pNewChild);
 }); // Add Child Item

 connect(ui-&gt;pb_DeleteItem, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 delete pCurrentSelectedItem;
 }); // Delete Current Item
}</code></pre>
다음은 Item을 접고 펼칠때마다 Column의 크기를 재 조정할 수 있는 기능입니다.&nbsp;
<pre id="code_1701393581829" data-ke-language="cpp" data-ke-type="codeblock"><code>MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui-&gt;setupUi(this);

 QTreeWidgetItem* headerItem = new QTreeWidgetItem;
 headerItem-&gt;setText(0, "Name");
 headerItem-&gt;setText(1, "Price");
 ui-&gt;treeWidget-&gt;setHeaderItem(headerItem); // header

 QTreeWidgetItem* Parent = new QTreeWidgetItem(ui-&gt;treeWidget);
 Parent-&gt;setText(0, "Nintendo");

 QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
 Child-&gt;setText(0, "Zelda");
 Child-&gt;setText(1, "70000");

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemClicked, [&amp;] (QTreeWidgetItem *item, int column) {
 QString sName = item-&gt;text(0);
 ui-&gt;lbTreeItemTitle-&gt;setText(sName);
 }); // Display Current Selected Item Name(Column = 0)

 connect(ui-&gt;pb_AddChild, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
 pNewChild-&gt;setText(0, ui-&gt;le_ChildTitle-&gt;text());
 pCurrentSelectedItem-&gt;addChild(pNewChild);
 }); // Add Child Item

 connect(ui-&gt;pb_DeleteItem, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 delete pCurrentSelectedItem;
 }); // Delete Current Item

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemExpanded, [&amp;] (QTreeWidgetItem *item) {
 ui-&gt;treeWidget-&gt;resizeColumnToContents(0);
 ui-&gt;treeWidget-&gt;resizeColumnToContents(1);
 }); // Resize Columns

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemCollapsed, [&amp;] (QTreeWidgetItem *item) {
 ui-&gt;treeWidget-&gt;resizeColumnToContents(0);
 ui-&gt;treeWidget-&gt;resizeColumnToContents(1);
 }); // Resize Columns
}</code></pre>
<figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
 <img src="https://blog.kakaocdn.net/dn/bryAD4/btsBcY6YoOK/0SUK1SkB5Ri2ONDNWwdEn0/img.png" onerror="this.onerror=null; this.src='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png'; this.srcset='//t1.daumcdn.net/tistory_admin/static/images/no-image-v1.png';" data-origin-width="534" data-origin-height="632">
 
 
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</figure>
마지막으로 TreeWidgetItem에 체크박스를 추가하고 체크 상태에 따라 부모와 자식의 상태도 자동으로 변하는 기능입니다.
<pre id="code_1701393864401" data-ke-language="cpp" data-ke-type="codeblock"><code>MainWindow::MainWindow(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::MainWindow)
{
 ui-&gt;setupUi(this);

 QTreeWidgetItem* headerItem = new QTreeWidgetItem;
 headerItem-&gt;setText(0, "Name");
 headerItem-&gt;setText(1, "Price");
 ui-&gt;treeWidget-&gt;setHeaderItem(headerItem); // header

 QTreeWidgetItem* Parent = new QTreeWidgetItem(ui-&gt;treeWidget);
 Parent-&gt;setCheckState(0, Qt::Unchecked);
 Parent-&gt;setFlags(Parent-&gt;flags() | Qt::ItemIsAutoTristate | Qt::ItemIsUserCheckable );
 Parent-&gt;setText(0, "Nintendo");

 QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
 Child-&gt;setFlags(Child-&gt;flags() | Qt::ItemIsUserCheckable );
 Child-&gt;setCheckState(0, Qt::Unchecked);
 Child-&gt;setText(0, "Zelda");
 Child-&gt;setText(1, "70000");

 Child = new QTreeWidgetItem(Parent);
 Child-&gt;setFlags(Child-&gt;flags() | Qt::ItemIsUserCheckable );
 Child-&gt;setCheckState(0, Qt::Unchecked);
 Child-&gt;setText(0, "Mario");
 Child-&gt;setText(1, "75000");

 Child = new QTreeWidgetItem(Parent);
 Child-&gt;setFlags(Child-&gt;flags() | Qt::ItemIsUserCheckable );
 Child-&gt;setCheckState(0, Qt::Unchecked);
 Child-&gt;setText(0, "Pockemon");
 Child-&gt;setText(1, "60000");

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemClicked, [&amp;] (QTreeWidgetItem *item, int column) {
 QString sName = item-&gt;text(0);
 ui-&gt;lbTreeItemTitle-&gt;setText(sName);
 }); // Display Current Selected Item Name(Column = 0)

 connect(ui-&gt;pb_AddChild, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
 pNewChild-&gt;setText(0, ui-&gt;le_ChildTitle-&gt;text());
 pCurrentSelectedItem-&gt;addChild(pNewChild);
 }); // Add Child Item

 connect(ui-&gt;pb_DeleteItem, &amp;QPushButton::clicked, [&amp;] {
 QTreeWidgetItem* pCurrentSelectedItem = ui-&gt;treeWidget-&gt;currentItem();
 if ( pCurrentSelectedItem == nullptr ) { return; }

 delete pCurrentSelectedItem;
 }); // Delete Current Item

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemExpanded, [&amp;] (QTreeWidgetItem *item) {
 ui-&gt;treeWidget-&gt;resizeColumnToContents(0);
 ui-&gt;treeWidget-&gt;resizeColumnToContents(1);
 }); // Resize Columns

 connect(ui-&gt;treeWidget, &amp;QTreeWidget::itemCollapsed, [&amp;] (QTreeWidgetItem *item) {
 ui-&gt;treeWidget-&gt;resizeColumnToContents(0);
 ui-&gt;treeWidget-&gt;resizeColumnToContents(1);
 }); // Resize Columns
}</code></pre>
자식 Item에 Check 시에는 자식이 다수일 경우에는 Qt::PartiallyChecked이고 다 선택되면 Qt::Checked 상태 그리고 부모에서 Check 시에는 자식 Item이 모두 Qt::Checked 상태로 변하게 됩니다.
<figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
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</figure><figure data-ke-mobilestyle="widthOrigin" data-origin-width="534" data-origin-height="632">
 
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</figure>
 
 
 </div></div>

1D1C

Qt를 설치할 때 볼 수 있던 아래와 같은 구조가지는 UI Component를 TreeWidget이라고 합니다. Qt에서 TreeWidget을 사용하는 법에 대해 간단히 소개하려고 합니다.
먼저 UI는 아래와 같이 구성했습니다. 상단에 QTreeWidget 그리고 하단에는 선택한 Item의 Text를 확인할 수 있는 Label과 선택된 Item에 자식 Item을 추가할 수 있는 Insert와 해당 Item을 지울 Delete 버튼입니다.
먼저 간단하게 Header와 몇가지 Item을 추가해보겠습니다.
#include "mainwindow.h"
#include "./ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTreeWidgetItem* headerItem = new QTreeWidgetItem;
    headerItem->setText(0, "Name");
    headerItem->setText(1, "Price");
    ui->treeWidget->setHeaderItem(headerItem);  // header
    QTreeWidgetItem* Parent = new QTreeWidgetItem(ui->treeWidget);
    Parent->setText(0, "Nintendo");
    QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
    Child->setText(0, "Zelda");
    Child->setText(1, "70000");
}
MainWindow::~MainWindow()
{
    delete ui;
}
Nintendo라는 부모 Item 아래 Zelda 라는 자식 Item을 추가했습니다.
여기에 선택된 Item의 Name을 label에 보여주는 Connect를 추가해보겠습니다.
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTreeWidgetItem* headerItem = new QTreeWidgetItem;
    headerItem->setText(0, "Name");
    headerItem->setText(1, "Price");
    ui->treeWidget->setHeaderItem(headerItem);  // header
    QTreeWidgetItem* Parent = new QTreeWidgetItem(ui->treeWidget);
    Parent->setText(0, "Nintendo");
    QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
    Child->setText(0, "Zelda");
    Child->setText(1, "70000");
    connect(ui->treeWidget, &QTreeWidget::itemClicked, [&] (QTreeWidgetItem *item, int column) {
        QString sName = item->text(0);
        ui->lbTreeItemTitle->setText(sName);
    });
}
다음으로 Add Child Item, Delete Item 코드입니다.
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTreeWidgetItem* headerItem = new QTreeWidgetItem;
    headerItem->setText(0, "Name");
    headerItem->setText(1, "Price");
    ui->treeWidget->setHeaderItem(headerItem);  // header
    QTreeWidgetItem* Parent = new QTreeWidgetItem(ui->treeWidget);
    Parent->setText(0, "Nintendo");
    QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
    Child->setText(0, "Zelda");
    Child->setText(1, "70000");
    connect(ui->treeWidget, &QTreeWidget::itemClicked, [&] (QTreeWidgetItem *item, int column) {
        QString sName = item->text(0);
        ui->lbTreeItemTitle->setText(sName);
    }); // Display Current Selected Item Name(Column = 0)
    connect(ui->pb_AddChild, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
        pNewChild->setText(0, ui->le_ChildTitle->text());
        pCurrentSelectedItem->addChild(pNewChild);
    }); // Add Child Item
    connect(ui->pb_DeleteItem, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        delete pCurrentSelectedItem;
    }); // Delete Current Item
}
다음은 Item을 접고 펼칠때마다 Column의 크기를 재 조정할 수 있는 기능입니다. 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTreeWidgetItem* headerItem = new QTreeWidgetItem;
    headerItem->setText(0, "Name");
    headerItem->setText(1, "Price");
    ui->treeWidget->setHeaderItem(headerItem);  // header
    QTreeWidgetItem* Parent = new QTreeWidgetItem(ui->treeWidget);
    Parent->setText(0, "Nintendo");
    QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
    Child->setText(0, "Zelda");
    Child->setText(1, "70000");
    connect(ui->treeWidget, &QTreeWidget::itemClicked, [&] (QTreeWidgetItem *item, int column) {
        QString sName = item->text(0);
        ui->lbTreeItemTitle->setText(sName);
    }); // Display Current Selected Item Name(Column = 0)
    connect(ui->pb_AddChild, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
        pNewChild->setText(0, ui->le_ChildTitle->text());
        pCurrentSelectedItem->addChild(pNewChild);
    }); // Add Child Item
    connect(ui->pb_DeleteItem, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        delete pCurrentSelectedItem;
    }); // Delete Current Item
    connect(ui->treeWidget, &QTreeWidget::itemExpanded, [&] (QTreeWidgetItem *item) {
        ui->treeWidget->resizeColumnToContents(0);
        ui->treeWidget->resizeColumnToContents(1);
    }); // Resize Columns
    connect(ui->treeWidget, &QTreeWidget::itemCollapsed, [&] (QTreeWidgetItem *item) {
        ui->treeWidget->resizeColumnToContents(0);
        ui->treeWidget->resizeColumnToContents(1);
    }); // Resize Columns
}
마지막으로 TreeWidgetItem에 체크박스를 추가하고 체크 상태에 따라 부모와 자식의 상태도 자동으로 변하는 기능입니다.
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTreeWidgetItem* headerItem = new QTreeWidgetItem;
    headerItem->setText(0, "Name");
    headerItem->setText(1, "Price");
    ui->treeWidget->setHeaderItem(headerItem);  // header
    QTreeWidgetItem* Parent = new QTreeWidgetItem(ui->treeWidget);
    Parent->setCheckState(0, Qt::Unchecked);
    Parent->setFlags(Parent->flags() | Qt::ItemIsAutoTristate | Qt::ItemIsUserCheckable );
    Parent->setText(0, "Nintendo");
    QTreeWidgetItem* Child = new QTreeWidgetItem(Parent);
    Child->setFlags(Child->flags() | Qt::ItemIsUserCheckable );
    Child->setCheckState(0, Qt::Unchecked);
    Child->setText(0, "Zelda");
    Child->setText(1, "70000");
    Child = new QTreeWidgetItem(Parent);
    Child->setFlags(Child->flags() | Qt::ItemIsUserCheckable );
    Child->setCheckState(0, Qt::Unchecked);
    Child->setText(0, "Mario");
    Child->setText(1, "75000");
    Child = new QTreeWidgetItem(Parent);
    Child->setFlags(Child->flags() | Qt::ItemIsUserCheckable );
    Child->setCheckState(0, Qt::Unchecked);
    Child->setText(0, "Pockemon");
    Child->setText(1, "60000");
    connect(ui->treeWidget, &QTreeWidget::itemClicked, [&] (QTreeWidgetItem *item, int column) {
        QString sName = item->text(0);
        ui->lbTreeItemTitle->setText(sName);
    }); // Display Current Selected Item Name(Column = 0)
    connect(ui->pb_AddChild, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        QTreeWidgetItem* pNewChild = new QTreeWidgetItem;
        pNewChild->setText(0, ui->le_ChildTitle->text());
        pCurrentSelectedItem->addChild(pNewChild);
    }); // Add Child Item
    connect(ui->pb_DeleteItem, &QPushButton::clicked, [&] {
        QTreeWidgetItem* pCurrentSelectedItem = ui->treeWidget->currentItem();
        if ( pCurrentSelectedItem == nullptr ) { return; }
        delete pCurrentSelectedItem;
    }); // Delete Current Item
    connect(ui->treeWidget, &QTreeWidget::itemExpanded, [&] (QTreeWidgetItem *item) {
        ui->treeWidget->resizeColumnToContents(0);
        ui->treeWidget->resizeColumnToContents(1);
    }); // Resize Columns
    connect(ui->treeWidget, &QTreeWidget::itemCollapsed, [&] (QTreeWidgetItem *item) {
        ui->treeWidget->resizeColumnToContents(0);
        ui->treeWidget->resizeColumnToContents(1);
    }); // Resize Columns
}
자식 Item에 Check 시에는 자식이 다수일 경우에는 Qt::PartiallyChecked이고 다 선택되면 Qt::Checked 상태 그리고 부모에서 Check 시에는 자식 Item이 모두 Qt::Checked 상태로 변하게 됩니다.

[Qt] TreeWidget 사용하기

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