Qt開發(fā)之QTreeWidget的使用教程詳解

更新時(shí)間：2022年12月01日 09:36:28 作者：音視頻開發(fā)老舅

這篇文章主要為大家詳細(xì)介紹了Qt中QTreeWidget使用的相關(guān)資料，文中的示例代碼講解詳細(xì)，對(duì)我們學(xué)習(xí)Qt有一定的幫助，感興趣的小伙伴可以了解一下

一.常用API設(shè)置

1.添加頂層節(jié)點(diǎn)

    //添加頂層節(jié)點(diǎn)
    QTreeWidgetItem *topItem1 = new QTreeWidgetItem(ui->treeWidget);
    topItem1->setText(0,"百度");
    ui->treeWidget->addTopLevelItem(topItem1);

2.設(shè)置表頭隱藏,展開所有項(xiàng)

    //隱藏表頭
    ui->treeWidget->setHeaderHidden(true);
    //設(shè)置展開
    ui->treeWidget->expandAll();

3.頂層節(jié)點(diǎn)添加子節(jié)點(diǎn)

    QTreeWidgetItem *item11 = new QTreeWidgetItem(topItem1);
    item11->setText(0,"研發(fā)部");
    QTreeWidgetItem *item12 = new QTreeWidgetItem(topItem1);
    item12->setText(0,"銷售部");
    QTreeWidgetItem *item13 = new QTreeWidgetItem(topItem1);
    item13->setText(0,"人事部");

4.節(jié)點(diǎn)可以帶一些數(shù)據(jù),使用setData()這個(gè)接口

    //設(shè)置數(shù)據(jù),可以帶多種數(shù)據(jù)
    item11->setData(0,Qt::UserRole,100/*人員數(shù)量*/);
    item11->setData(0,Qt::UserRole+1,"李彥宏"/*負(fù)責(zé)人名字*/);
 
    //獲得數(shù)據(jù)
    item11->data(0,Qt::UserRole).toInt();
    item11->data(0,Qt::UserRole+1).toString();

5.節(jié)點(diǎn)可以設(shè)置自定義類型，設(shè)置圖標(biāo)、flags、文本

//自定義枚舉
enum NodeType
{
    ROOT = 0,
    SON 
}；
 
QTreeWidgetItem *item = new QTreeWidgetItem(ROOT);
//item->setIcon();
//item->setText();
//item->setFlags();

二.設(shè)置帶checkBox

    QTreeWidgetItem *topItem2 = new QTreeWidgetItem(ui->treeWidget);
    topItem2->setText(0,"騰訊");
    topItem2->setCheckState(0,Qt::Checked);
    ui->treeWidget->addTopLevelItem(topItem2);
 
    QTreeWidgetItem *item21 = new QTreeWidgetItem(topItem2);
    item21->setText(0,"研發(fā)部");
    item21->setCheckState(0,Qt::Checked);
 
    QTreeWidgetItem *item22 = new QTreeWidgetItem(topItem2);
    item22->setText(0,"銷售部");
    item22->setCheckState(0,Qt::Checked);
 
    QTreeWidgetItem *item23 = new QTreeWidgetItem(topItem2);
    item23->setText(0,"人事部");
    item23->setCheckState(0,Qt::Checked);

簡(jiǎn)單的響應(yīng)一下點(diǎn)擊信號(hào),當(dāng)頂層節(jié)點(diǎn)選中,下面的所有子節(jié)點(diǎn)全選中

    connect(ui->treeWidget,&QTreeWidget::itemClicked,this,
            &Form::slotClicked);
 
    void Form::slotClicked(QTreeWidgetItem *item, int column)
    {
        //簡(jiǎn)單響應(yīng)一下選中狀態(tài)槽函數(shù)
        for (int i=0; i<item->childCount(); i++)
        {
           QTreeWidgetItem *pChildItem = item->child(i);
           pChildItem->setCheckState(0,item->checkState(0));
        }
    }

三.右鍵菜單

    //打開右鍵菜單屬性
    ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
 
    //右鍵菜單
    m_menu = new QMenu(ui->treeWidget);
    m_menu->addAction("添加");
    m_menu->addAction("刪除");
 
    //響應(yīng)右鍵菜單信號(hào)槽
    connect(ui->treeWidget,&QTreeWidget::customContextMenuRequested,
            this,&Form::slotMenuPopup);
    
    void Form::slotMenuPopup(const QPoint &pos)
    {
        m_menu->exec(ui->treeWidget->mapToGlobal(pos));
    }

四.設(shè)置qss

這里簡(jiǎn)單設(shè)置一下背景色，展開/合并時(shí)的圖標(biāo)，item的一些設(shè)置，僅供參考。

const QString styles = "QTreeView\
{\
    background-color: #5B677A;\
    font-size:17px;\
    color: white;\
}\
QTreeView::item:hover\
{\
    background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #e7effd, stop: 1 #cbdaf1);\
    border: 1px solid #bfcde4;\
}\
QTreeView::item:hover\
{\
    background: rgb(69, 187, 217);\
}\
QTreeView::item:selected:active\
{\
    background: rgb(63, 147, 168);\
}\
QTreeView::item:selected:!active\
{\
    background: rgb(63, 147, 168);\
}\
QTreeView::branch\
{\
    background:#5B677A;\
}\
QTreeView::branch:has-children:!has-siblings:closed,QTreeView::branch:closed:has-children:has-siblings\
{\
    border-image: none;\
    background:#5B677A;\
    image: url(image/Folder-1.png);\
}\
QTreeView::branch:open:has-children:!has-siblings,QTreeView::branch:open:has-children:has-siblings\
{\
    border-image: none;\
    background:#5B677A;\
    image: url(image/Open-Folder.png);\
}";

調(diào)用ui->treeWidget->setStyleSheet(styles);就行了

五.運(yùn)行效果

六.多列樹

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
 
const QString sstyle = "\
QHeaderView::section\
{\
    background-color: white;\
}";
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
 
    QStringList strList;
    strList<<"名稱"<<"年齡"<<"性別";
    ui->treeWidget->setHeaderLabels(strList);
    ui->treeWidget->header()->setStyleSheet(sstyle);
 
    QTreeWidgetItem *item1 = new QTreeWidgetItem(QStringList()<<"七年級(jí)");
    ui->treeWidget->addTopLevelItem(item1);
 
    QTreeWidgetItem *item11 = new QTreeWidgetItem(QStringList()<<"小漲"<<"13"<<"男");
    item1->addChild(item11);
    QTreeWidgetItem *item12 = new QTreeWidgetItem(QStringList()<<"小紅"<<"14"<<"女");
    item1->addChild(item12);
    QTreeWidgetItem *item13 = new QTreeWidgetItem(QStringList()<<"小麗"<<"13"<<"女");
    item1->addChild(item13);
 
    QTreeWidgetItem *item2 = new QTreeWidgetItem(QStringList()<<"八年級(jí)");
    ui->treeWidget->addTopLevelItem(item2);
 
    QTreeWidgetItem *item21 = new QTreeWidgetItem(QStringList()<<"小漲"<<"13"<<"男");
    item2->addChild(item21);
    QTreeWidgetItem *item22 = new QTreeWidgetItem(QStringList()<<"小紅"<<"14"<<"女");
    item2->addChild(item22);
    QTreeWidgetItem *item23 = new QTreeWidgetItem(QStringList()<<"小麗"<<"13"<<"女");
    item2->addChild(item23);
 
    QTreeWidgetItem *item3 = new QTreeWidgetItem(QStringList()<<"九年級(jí)");
    ui->treeWidget->addTopLevelItem(item3);
 
    QTreeWidgetItem *item31 = new QTreeWidgetItem(QStringList()<<"小漲"<<"13"<<"男");
    item3->addChild(item31);
    QTreeWidgetItem *item32 = new QTreeWidgetItem(QStringList()<<"小紅"<<"14"<<"女");
    item3->addChild(item32);
    QTreeWidgetItem *item33 = new QTreeWidgetItem(QStringList()<<"小麗"<<"13"<<"女");
    item3->addChild(item33);
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::on_treeWidget_itemClicked(QTreeWidgetItem *item, int column)
{
    qDebug()<<item->text(0);
    qDebug()<<item->text(1);
    qDebug()<<item->text(2);
}

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