Qt 学习笔记 TreeWidget 增删改
在窗体上放一个TreeWidget控件和四个PushButton加一个Horizontal Spacer
布局如图
给树添加元素节点的方法和实现
.h文件
QTreeWidgetItem * AddTreeRoot(QString name,QString desc);
QTreeWidgetItem * AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc);.cpp文件
QTreeWidgetItem * TreeViewView::AddTreeRoot(QString name,QString desc)
{
QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
ui->tv_Source->addTopLevelItem(item);
return item;
}
QTreeWidgetItem * TreeViewView::AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc)
{
QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
parent->addChild(item);
return item;
}在构造方法里添加元素设置树的列数和标题的名称 当然可以设置Header不显示，根据你的需求定
ui->tv_Source->setColumnCount(2);
ui->tv_Source->setHeaderLabels(QStringList()<<"Name"<<"Description");
//ui->tv_Source->setHeaderHidden(true);
QTreeWidgetItem * beiJingItem = AddTreeRoot("bejing","city");
AddTreeNode(beiJingItem,"haidian","HaiDian");
AddTreeNode(beiJingItem,"chaoYang","chaoYang");
AddTreeNode(beiJingItem,"fengTai","fengTai");
QTreeWidgetItem * HeiBeiItem =AddTreeRoot("hebei","city");
AddTreeNode(HeiBeiItem,"baoDing","baoDing");
AddTreeNode(HeiBeiItem,"shiJiaZhuang","shiJiaZhuang");添加事件相对来说比较简单 直接调用我的前边写的方法，因为TreeWidget一直是选中状态就加了一个
添加根节点的槽
void TreeViewView::on_btn_Add_clicked()
{
QTreeWidgetItem * item= ui->tv_Source->currentItem();
if(item!=Q_NULLPTR)
{
AddTreeNode(item,"new","new");
}
else
{
AddTreeRoot("new","new");
}
}
void TreeViewView::on_btn_AddRoot_clicked()
{
AddTreeRoot("new","new");
}修改方法也很简单
void TreeViewView::on_btn_Modify_clicked()
{
QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
if(currentItem==Q_NULLPTR)
{
return;
}
for(int i=0;i<currentItem->columnCount();i++)
{
currentItem->setText(i,tr("Modify")+QString::number(i));
}
}删除槽就要考虑的多一点 要看它有没有父节点
void TreeViewView::on_btn_Del_clicked()
{
QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
if(currentItem==Q_NULLPTR)
{
return;
}
//如果没有父节点就直接删除
if(currentItem->parent()==Q_NULLPTR)
{
delete ui->tv_Source->takeTopLevelItem(ui->tv_Source->currentIndex().row());
}
else
{
//如果有父节点就要用父节点的takeChild删除节点
delete currentItem->parent()->takeChild(ui->tv_Source->currentIndex().row());
}
}看一下效果
完整代码 .h文件
#ifndef TREEVIEWVIEW_H
#define TREEVIEWVIEW_H
#include <QDialog>
#include<QString>
#include<QTreeWidgetItem>
namespace Ui {
class TreeViewView;
}
class TreeViewView : public QDialog
{
Q_OBJECT
public:
explicit TreeViewView(QWidget *parent = 0);
~TreeViewView();
private slots:
void on_tv_Source_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
void on_btn_Add_clicked();
void on_btn_AddRoot_clicked();
void on_btn_Del_clicked();
void on_btn_Modify_clicked();
private:
Ui::TreeViewView *ui;
QTreeWidgetItem * AddTreeRoot(QString name,QString desc);
QTreeWidgetItem * AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc);
};
#endif // TREEVIEWVIEW_H.cpp文件
#include "treeviewview.h"
#include "ui_treeviewview.h"
#include <QStringList>
TreeViewView::TreeViewView(QWidget *parent) :
QDialog(parent),
ui(new Ui::TreeViewView)
{
ui->setupUi(this);
ui->tv_Source->setColumnCount(2);
ui->tv_Source->setHeaderLabels(QStringList()<<"Name"<<"Description");
//ui->tv_Source->setHeaderHidden(true);
QTreeWidgetItem * beiJingItem = AddTreeRoot("bejing","city");
AddTreeNode(beiJingItem,"haidian","HaiDian");
AddTreeNode(beiJingItem,"chaoYang","chaoYang");
AddTreeNode(beiJingItem,"fengTai","fengTai");
QTreeWidgetItem * HeiBeiItem =AddTreeRoot("hebei","city");
AddTreeNode(HeiBeiItem,"baoDing","baoDing");
AddTreeNode(HeiBeiItem,"shiJiaZhuang","shiJiaZhuang");
}
TreeViewView::~TreeViewView()
{
delete ui;
}
QTreeWidgetItem * TreeViewView::AddTreeRoot(QString name,QString desc)
{
QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
ui->tv_Source->addTopLevelItem(item);
return item;
}
QTreeWidgetItem * TreeViewView::AddTreeNode(QTreeWidgetItem *parent,QString name,QString desc)
{
QTreeWidgetItem * item=new QTreeWidgetItem(QStringList()<<name<<desc);
parent->addChild(item);
return item;
}
void TreeViewView::on_tv_Source_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
{
if(current==Q_NULLPTR)return;
if(previous!=Q_NULLPTR)
{
previous->setBackground(0,Qt::transparent);
previous->setBackground(1,Qt::transparent);
previous->setTextColor(0,Qt::black);
previous->setTextColor(1,Qt::black);
}
current->setTextColor(0,Qt::blue);
current->setTextColor(1,Qt::blue);
current->setBackground(0,Qt::red);
current->setBackground(1,Qt::red);
}
void TreeViewView::on_btn_Add_clicked()
{
QTreeWidgetItem * item= ui->tv_Source->currentItem();
if(item!=Q_NULLPTR)
{
AddTreeNode(item,"new","new");
}
else
{
AddTreeRoot("new","new");
}
}
void TreeViewView::on_btn_AddRoot_clicked()
{
AddTreeRoot("new","new");
}
void TreeViewView::on_btn_Del_clicked()
{
QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
if(currentItem==Q_NULLPTR)
{
return;
}
//如果没有父节点就直接删除
if(currentItem->parent()==Q_NULLPTR)
{
delete ui->tv_Source->takeTopLevelItem(ui->tv_Source->currentIndex().row());
}
else
{
//如果有父节点就要用父节点的takeChild删除节点
delete currentItem->parent()->takeChild(ui->tv_Source->currentIndex().row());
}
}
void TreeViewView::on_btn_Modify_clicked()
{
QTreeWidgetItem * currentItem = ui->tv_Source->currentItem();
if(currentItem==Q_NULLPTR)
{
return;
}
for(int i=0;i<currentItem->columnCount();i++)
{
currentItem->setText(i,tr("Modify")+QString::number(i));
}
}本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2014-04-08 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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