QListWidget控件应用示例

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QMenu> //void MainWindow::createListContextMenu() //{ //创建右键弹出式菜单 // menuList=new QMenu(this); //创建菜单 // //添加Actions创建菜单项 // menuList->addAction(ui->actListIni); // menuList->addAction(ui->actListClear); // menuList->addAction(ui->actListInsert); // menuList->addAction(ui->actListAppend); // menuList->addAction(ui->actListDelete); // menuList->addSeparator(); // menuList->addAction(ui->actListSelALL); // menuList->addAction(ui->actListSelNone); // menuList->addAction(ui->actListSelInvs); //} void MainWindow::setActionsForButton() {//为QToolButton按钮设置Action ui->tBtnListIni->setDefaultAction(ui->actListIni); ui->tBtnListClear->setDefaultAction(ui->actListClear); ui->tBtnListInsert->setDefaultAction(ui->actListInsert); ui->tBtnListAppend->setDefaultAction(ui->actListAppend); ui->tBtnListDelete->setDefaultAction(ui->actListDelete); ui->tBtnSelALL->setDefaultAction(ui->actSelALL); ui->tBtnSelNone->setDefaultAction(ui->actSelNone); ui->tBtnSelInvs->setDefaultAction(ui->actSelInvs); } void MainWindow::createSelectionPopMenu() { //创建下拉菜单 QMenu* menuSelection=new QMenu(this); //创建选择弹出式菜单 menuSelection->addAction(ui->actSelALL); menuSelection->addAction(ui->actSelNone); menuSelection->addAction(ui->actSelInvs); //listWidget上方的tBtnSelectItem按钮 ui->tBtnSelectItem->setPopupMode(QToolButton::MenuButtonPopup);//菜单弹出模式，执行按钮的Action ui->tBtnSelectItem->setToolButtonStyle(Qt::ToolButtonTextBesideIcon); //按钮样式 ui->tBtnSelectItem->setDefaultAction(ui->actSelPopMenu);//关联Action ui->tBtnSelectItem->setMenu(menuSelection); //设置下拉菜单 //工具栏上的 下拉式菜单按钮 QToolButton *aBtn=new QToolButton(this); aBtn->setPopupMode(QToolButton::InstantPopup);//button's own action is not triggered. aBtn->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);//按钮样式 aBtn->setDefaultAction(ui->actSelPopMenu); //设置Action,获取图标、标题等设置 aBtn->setMenu(menuSelection);//设置下拉菜单 ui->mainToolBar->addWidget(aBtn); //工具栏添加按钮 //工具栏添加分隔条，和“退出”按钮 ui->mainToolBar->addSeparator(); ui->mainToolBar->addAction(ui->actQuit); } MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); //由于在设计器里无法更改tabWidget三个页面的文字标签，在构造函数里用函数修改 // ui->tabWidget->setTabText(0,"QListWidget"); // ui->tabWidget->setTabText(1,"QTreeWidget"); // ui->tabWidget->setTabText(2,"QTableWidget"); setCentralWidget(ui->splitter); //设置中心组件 setActionsForButton(); createSelectionPopMenu(); // createListContextMenu(); //创建弹出式菜单 } MainWindow::~MainWindow() { delete ui; // delete menuList; //手工创建的指针必须手工删除 } void MainWindow::on_actListClear_triggered() { ui->listWidget->clear(); //清除项 } void MainWindow::on_actListIni_triggered() { //初始化项 QListWidgetItem *aItem; //每一行是一个QListWidgetItem QIcon aIcon; aIcon.addFile(":/images/icons/check2.ico"); //设置ICON的图标 bool chk=ui->chkBoxListEditable->isChecked();//是否可编辑 ui->listWidget->clear(); //清除项 for (int i=0; i<10; i++) { QString str=QString::asprintf("Item %d",i); aItem=new QListWidgetItem(); //新建一个项 aItem->setText(str); //设置文字标签 aItem->setIcon(aIcon);//设置图标 aItem->setCheckState(Qt::Checked); //设置为选中状态 if (chk) //可编辑, 设置flags aItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); else//不可编辑, 设置flags aItem->setFlags(Qt::ItemIsSelectable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); ui->listWidget->addItem(aItem); //增加一个项 } } void MainWindow::on_chkBoxListEditable_clicked(bool checked) { //可编辑 QCheckBox的响应代码， 设置所有项是否可编辑 int i,cnt; QListWidgetItem *aItem; Qt::ItemFlags flags; cnt=ui->listWidget->count();//项的个数 for (i=0; i<cnt; i++) { aItem=ui->listWidget->item(i);//获得一个项 // flags=aItem->flags(); if (checked) //可编辑 aItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); else aItem->setFlags(Qt::ItemIsSelectable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); // flags = flags & (!Qt::ItemIsEditable); // aItem->setFlags(flags); } } void MainWindow::on_listWidget_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous) { //listWidget当前选中项发生变化 QString str; if (current != NULL) //需要检测变量指针是否为空 { if (previous==NULL) //需要检测变量指针是否为空 str="当前："+current->text(); else str="前一项："+previous->text()+"; 当前项："+current->text(); ui->editCutItemText->setText(str); } } void MainWindow::on_actListInsert_triggered() { //插入一个项 // QListWidgetItem *aItem; QIcon aIcon; aIcon.addFile(":/images/icons/check2.ico"); //图标 bool chk=ui->chkBoxListEditable->isChecked(); //是否可比那几 QListWidgetItem* aItem=new QListWidgetItem("New Inserted Item"); //创建一个项 aItem->setIcon(aIcon);//设置图标 aItem->setCheckState(Qt::Checked); //设置为checked if (chk) //设置标记 aItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); else aItem->setFlags(Qt::ItemIsSelectable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); ui->listWidget->insertItem(ui->listWidget->currentRow(),aItem); //在当前行的上方插入一个项 } void MainWindow::on_actListAppend_triggered() {//增加一个项 // QListWidgetItem *aItem; // bool chk; QIcon aIcon; aIcon.addFile(":/images/icons/check2.ico"); //设定图标 bool chk=ui->chkBoxListEditable->isChecked();//是否可编辑 QListWidgetItem* aItem=new QListWidgetItem("New Added Item"); //创建一个Item aItem->setIcon(aIcon); //设置图标 aItem->setCheckState(Qt::Checked); //设置为checked if (chk) //设置标志 aItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEditable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); else aItem->setFlags(Qt::ItemIsSelectable |Qt::ItemIsUserCheckable |Qt::ItemIsEnabled); ui->listWidget->addItem(aItem);//增加一个项 } void MainWindow::on_actListDelete_triggered() { //删除当前项 // QListWidgetItem *aItem; int row=ui->listWidget->currentRow();//当前行 QListWidgetItem* aItem=ui->listWidget->takeItem(row); //移除指定行的项，但不delete delete aItem; //需要手工删除对象 // QListWidgetItem *QListWidget::takeItem(int row) // Removes and returns the item from the given row in // the list widget; otherwise returns 0. // Items removed from a list widget will not be managed by Qt, // and will need to be deleted manually. } void MainWindow::on_listWidget_customContextMenuRequested(const QPoint &pos) { Q_UNUSED(pos); // QMenu *menuList; //自定义弹出式菜单 QMenu* menuList=new QMenu(this); //创建菜单 //添加Actions创建菜单项 menuList->addAction(ui->actListIni); menuList->addAction(ui->actList