Qt5开发及实例-CH209.rar，Qt5创建具有复选框的树形控件代码

#include "widget.h" #include "ui_widget.h" 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))); } 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->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt:: ItemIsSelectable); subItem12->setText(0, "subItem12"); subItem12->setCheckState(0, Qt::Unchecked); QTreeWidgetItem *subItem13 = new QTreeWidgetItem(group1); subItem13->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable); subItem13->setText(0, "subItem13"); subItem13->setCheckState(0, Qt::Unchecked); QTreeWidgetItem *subItem14 = new QTreeWidgetItem(group1); subItem14->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt:: ItemIsSelectable); subItem14->setText(0, "subItem14"); 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->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt:: ItemIsSelectable); subItem22->setText(0, "subItem22"); subItem22->setCheckState(0, Qt::Unchecked); QTreeWidgetItem *subItem23 = new QTreeWidgetItem(group2); subItem23->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt:: ItemIsSelectable); subItem23->setText(0, "subItem23"); subItem23->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::Unchecked); } } else { updateParentItem(item); } } } void Widget::updateParentItem(QTreeWidgetItem* item) { QTreeWidgetItem *parent = item->parent(); if (parent == NULL) { return; } //选中的子节点个数 int selectedCount = 0; int childCount = parent->childCount(); for (int i = 0; i < childCount; i++) { QTreeWidgetItem *childItem = parent->child(i); if (childItem->checkState(0) == Qt::Checked) { selectedCount++; } } if (selectedCount <= 0) { //未选中状态 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) { //选中状态 parent->setCheckState(0, Qt::Checked); } } Widget::~Widget() { delete ui; }