#include <widget.h>
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QTreeWidgetItem>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
public:
void init();
void updateParentItem(QTreeWidgetItem* item);
private slots:
void treeItemChanged(QTreeWidgetItem* item, int column);
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
#include <widget.cpp>
#include "widget.h"
#include "ui_widget.h"
#include <QString>
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
init();
connect(ui->treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*,int)), this,
SLOT(treeItemChanged(QTreeWidgetItem*,int)));
}
Widget::~Widget()
{
delete ui;
}
void Widget::init()
{
ui->treeWidget->clear();
//第一个分组
QTreeWidgetItem * group1 = new QTreeWidgetItem(ui->treeWidget);
group1->setText(0, "group1");
group1->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
group1->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem* subItem11 = new QTreeWidgetItem(group1);
subItem11->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem11->setText(0, "subItem11");
subItem11->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem12 = new QTreeWidgetItem(group1);
subItem12->setText(0, "subItem12");
subItem12->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem12->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem13 = new QTreeWidgetItem(group1);
subItem13->setText(0, "subItem13");
subItem13->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem13->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem14 = new QTreeWidgetItem(group1);
subItem14->setText(0, "subItem14");
subItem14->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem14->setCheckState(0, Qt::Unchecked);
//第二个分组
QTreeWidgetItem * group2 = new QTreeWidgetItem(ui->treeWidget);
group2->setText(0, "group2");
group2->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
group2->setCheckState(0,Qt::Unchecked);
QTreeWidgetItem* subItem21 = new QTreeWidgetItem(group2);
subItem21->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem21->setText(0, "subItem21");
subItem21->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem22 = new QTreeWidgetItem(group2);
subItem22->setText(0, "subItem22");
subItem22->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem22->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem23 = new QTreeWidgetItem(group2);
subItem23->setText(0, "subItem23");
subItem23->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem23->setCheckState(0, Qt::Unchecked);
QTreeWidgetItem* subItem24 = new QTreeWidgetItem(group2);
subItem24->setText(0, "subItem24");
subItem24->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable);
subItem24->setCheckState(0, Qt::Unchecked);
}
void Widget::treeItemChanged(QTreeWidgetItem *item, int column)
{
QString itemText = item->text(0);
//选中时
if(Qt::Checked == item->checkState(0))
{
QTreeWidgetItem* parent = item->parent();
int count = item->childCount();
if(count > 0)
{
for(int i = 0; i < count; i++)
{
//子节点也被选中
item->child(i)->setCheckState(0, Qt::Checked);
}
}
else
{
//是子节点
updateParentItem(item);
}
}
else if(Qt::Unchecked == item->checkState(0))
{
int count = item->childCount();
if(count > 0)
{
for(int i = 0; i < count; i++)
{
item->child(i)->setCheckState(0, Qt::Checked);
}
}
else
{
updateParentItem(item);
}
}
}
void Widget::updateParentItem(QTreeWidgetItem *item)
{
QTreeWidgetItem* parent = item->parent();
//如果是主节点
if(parent == NULL) return;
//选中子节点个数
int selectedCount = 0;
int childCount = parent->childCount();
for(int i = 0 ; i < childCount; i++)
{
QTreeWidgetItem* chileItem = parent->child(i);
if(chileItem->checkState(0) == Qt::Checked)
{
selectedCount++;
}
}
if(selectedCount <= 0)
{
//选中状态
parent->setCheckState(0, Qt::Unchecked);
}
else if(selectedCount > 0 && selectedCount < childCount)
{
//部分选中状态
parent->setCheckState(0, Qt::PartiallyChecked);
}
else if(selectedCount == childCount)
{
//未选中状态
parent->setCheckState(0, Qt::Checked);
}
}