Qt 树形控件QTreeWidget

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最新推荐文章于 2025-06-15 16:59:29 发布

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分类专栏： Qt

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#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
    void init();
    void updateParentItem(QTreeWidgetItem *item);

public slots:
    void treeItemChanged(QTreeWidgetItem *item,int column);
private:
    QTreeWidget *treeWidget;

};

#endif // WIDGET_H#include "widget.h"
#include 
#include 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    treeWidget = new QTreeWidget(this);


    init();
    connect(treeWidget,SIGNAL(itemChanged(QTreeWidgetItem*,int)),this,SLOT(treeItemChanged(QTreeWidgetItem*,int)));


    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->addWidget(treeWidget);

}

void Widget::init()
{
    //在树形控件treeWidget 上创建节点 名称为group
    QTreeWidgetItem *group1 = new QTreeWidgetItem(treeWidget);
    group1->setText(0,"group1");
    //用户可以选中或未被选中。用户可以与产品进行交互。
    group1->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
    //给定列中设置项检查状态
    group1->setCheckState(0,Qt::Checked);

    //在节点上创建子节点
    QTreeWidgetItem *subItem1 = new QTreeWidgetItem(group1);
    subItem1->setText(0,"subItem1");
    subItem1->setFlags(Qt::ItemIsUserCheckable| Qt::ItemIsEnabled|Qt::ItemIsSelectable);
    subItem1->setCheckState(0,Qt::Unchecked);

    QTreeWidgetItem *subItem2 = new QTreeWidgetItem(group1);
    subItem2->setText(0,"subItem2");
    subItem2->setFlags(Qt::ItemIsUserCheckable| Qt::ItemIsEnabled|Qt::ItemIsSelectable);
    subItem2->setCheckState(0,Qt::Checked);

    QTreeWidgetItem *group2 = new QTreeWidgetItem(treeWidget);
    group2->setText(0,"group2");
    group2->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
    group2->setCheckState(0,Qt::Unchecked);

    QTreeWidgetItem *subitem3 = new QTreeWidgetItem(group2);
    subitem3->setText(0,"subItem3");
    subitem3->setFlags(Qt::ItemIsUserCheckable| Qt::ItemIsEnabled|Qt::ItemIsSelectable);
    subitem3->setCheckState(0,Qt::Checked);



}

void Widget::updateParentItem(QTreeWidgetItem *item)
{
    QTreeWidgetItem *parent  = item->parent();
    if(parent == NULL)
    {
        return;
    }
    //选中子节点的个数
    int selectedCount = 0;
    int childCount = parent->childCount();

    for(int i=0;ichild(i);
        if(childItem->checkState(0) == Qt::Checked)
        {
            selectedCount++; //检查每个子节点是否被选中 计算选中总数
        }
    }

    if(selectedCount<=0)
    {
        parent->setCheckState(0,Qt::Unchecked);
    }
    else if(selectedCount > 0 && selectedCount < childCount)
    {
        parent->setCheckState(0,Qt::PartiallyChecked);
    }
    else if(selectedCount == childCount)
    {
        //如何子节点都选中 把父节点也设置成选中状态
        parent->setCheckState(0,Qt::Checked);
    }
}
//槽函数
void Widget::treeItemChanged(QTreeWidgetItem *item, int column)
{
    //QString itemText = item->text(0);
    if(Qt::Checked == item->checkState(0))
    {
        //返回项的父。
        //QTreeWidgetItem *parent = item->parent();
        //返回子元素的数量。
        int count = item->childCount();
        if(count>0)
        {
            for(int i=0;ichild(i)->setCheckState(0,Qt::Checked);
            }
        }
        else
        {
            //更新子节点
            updateParentItem(item);
        }
    }
    else if(Qt::Unchecked == item->checkState(0))
    {
        int count = item->childCount();
        if(count > 0)
        {
            for(int i=0;ichild(i)->setCheckState(0,Qt::Unchecked);
            }
        }
        else
        {
            updateParentItem(item);
        }
    }
}

Widget::~Widget()
{
    delete treeWidget;
}#include "widget.h"
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}