学习了一下ListWidget控件的使用，做一个小功能增删改
先把代码分解最后给出完整代码
在窗体上添加一个ListWidget 一个Horizontal Specer和 三个PushButton
效果如下
因为构造函数中的SetupUi(this)会自动将符合on_objectName_signalName()命名
的任意槽与相应的objectName的signalName()信号连接到一起
我就直接在.h文件里添加槽的声明
private slots: void on_btn_AddEvent_clicked(); void on_btn_Del_clicked(); void on_btn_Modify_clicked(); void on_lvWid_Source_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous);
先在给ListWidget控件添加一些元素
MyElementsView::MyElementsView(QWidget *parent) : QDialog(parent), ui(new Ui::MyElementsView) { ui->setupUi(this); for(int i=0;i<5;i++) { ui->lvWid_Source->addItem(tr("item : ") + QString::number(i)); } }
这样ListWidget就有5个元素了
我们再看一下它的curretnItemChanged事件
void on_lvWid_Source_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous);
在这里我们把选中行的字体变为蓝色行背景变为红色
在.cpp里实现
void MyElementsView::on_lvWid_Source_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous) { if(current==Q_NULLPTR)return; if(previous!=Q_NULLPTR) { previous->setBackgroundColor(Qt::transparent); previous->setTextColor(Qt::black); } current->setBackgroundColor(Qt::red); current->setTextColor(Qt::blue); }
效果如下
添加事件比较简单
在cpp实现
void MyElementsView::on_btn_AddEvent_clicked() { ui->lvWid_Source->addItem(tr("new item : ") +QString::number(ui->lvWid_Source->count())); }
直接用它自己的addItem方法就可以
删除有些麻烦
void MyElementsView::on_btn_Del_clicked() { if(ui->lvWid_Source->currentItem()!=Q_NULLPTR) { QListWidgetItem * item = ui->lvWid_Source->takeItem(ui->lvWid_Source->currentRow()); delete item; } }
删除要先把选中的widget取出来再进行删除
修改实现也比较简单
void MyElementsView::on_btn_Modify_clicked() { if(ui->lvWid_Source->currentItem()!=Q_NULLPTR) { ui->lvWid_Source->currentItem()->setText(tr("Modify :Item ") +QString::number(ui->lvWid_Source->count())); } }
看一下效果
完整代码如下
.h
#ifndef MYELEMENTSVIEW_H #define MYELEMENTSVIEW_H #include <QDialog> #include<QListWidgetItem> namespace Ui { class MyElementsView; } class MyElementsView : public QDialog { Q_OBJECT public: explicit MyElementsView(QWidget *parent = 0); ~MyElementsView(); private: Ui::MyElementsView *ui; private slots: void on_btn_AddEvent_clicked(); void on_btn_Del_clicked(); void on_btn_Modify_clicked(); void on_lvWid_Source_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous); }; #endif // MYELEMENTSVIEW_H
.cpp完整代码
#include "myelementsview.h" #include "ui_myelementsview.h" #include <QToolBar> #include<QHBoxLayout> #include<QMainWindow> #include<QMessageBox> #include<QList> MyElementsView::MyElementsView(QWidget *parent) : QDialog(parent), ui(new Ui::MyElementsView) { ui->setupUi(this); for(int i=0;i<5;i++) { ui->lvWid_Source->addItem(tr("item : ") + QString::number(i)); } } void MyElementsView::on_btn_AddEvent_clicked() { ui->lvWid_Source->addItem(tr("new item : ") +QString::number(ui->lvWid_Source->count())); //多选 // const QList<QListWidgetItem *> items = ui->lvWid_Source->selectedItems(); // foreach (QListWidgetItem * item, items) { // item->text(); // item->setTextColor(Qt::blue); // } } void MyElementsView::on_btn_Del_clicked() { if(ui->lvWid_Source->currentItem()!=Q_NULLPTR) { QListWidgetItem * item = ui->lvWid_Source->takeItem(ui->lvWid_Source->currentRow()); delete item; } } void MyElementsView::on_btn_Modify_clicked() { if(ui->lvWid_Source->currentItem()!=Q_NULLPTR) { ui->lvWid_Source->currentItem()->setText(tr("Modify :Item ") +QString::number(ui->lvWid_Source->count())); } } MyElementsView::~MyElementsView() { delete ui; } void MyElementsView::on_lvWid_Source_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous) { if(current==Q_NULLPTR)return; if(previous!=Q_NULLPTR) { previous->setBackgroundColor(Qt::transparent); previous->setTextColor(Qt::black); } current->setBackgroundColor(Qt::red); current->setTextColor(Qt::blue); }
