#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();
}
Qt 树形控件QTreeWidget
最新推荐文章于 2025-06-15 16:59:29 发布