Qt实现视频播放列表 QListWidget

1、创建Qt项目

2、设计Qt界面

3、编写代码

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT
    
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
 
private:
    void onRadioButtonClicked(); 
    void onItemClicked(QListWidgetItem* item);
    void onItemDoubleClicked(QListWidgetItem* item);
    
private slots:
    void onBtnAddClicked();
    void onBtnDeleteClicked();
    
    //Files list 
//    int getFiles(const QString& dirName);
    
private:
    Ui::Widget *ui;
    QButtonGroup* mBtnGroup;
    QList fileAllList;
    QList fileNameAllList;
    bool strOmit = false;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"


#include 
QStringList iconStringList = {
  ":/images/apple.png",  
  ":/images/banana.png",  
  ":/images/orange.png",  
  ":/images/peach.png",  
  ":/images/strawberry.png",  
};

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    
    //设置显示模式
    mBtnGroup = new QButtonGroup(this);
    mBtnGroup->addButton(ui->rbListMode,0);
    mBtnGroup->addButton(ui->rbIconMode,1);
    connect(ui->rbListMode,&QRadioButton::clicked,this,&Widget::onRadioButtonClicked);
    connect(ui->rbIconMode,&QRadioButton::clicked,this,&Widget::onRadioButtonClicked);
    ui->rbListMode->setChecked(true);
    ui->videoListWidget->setViewMode(QListView::ListMode);
    
    //单击和双击信号槽
    connect(ui->videoListWidget,&QListWidget::itemClicked,this,&Widget::onItemClicked);
    connect(ui->videoListWidget,&QListWidget::itemDoubleClicked,this,&Widget::onItemDoubleClicked);
    
    //add/delete
    connect(ui->btnAdd,&QPushButton::clicked,this,&Widget::onBtnAddClicked);
    connect(ui->btnDelete,&QPushButton::clicked,this,&Widget::onBtnDeleteClicked);
    
    //不显示行向滚动条，子项文本过长自动显示...
    ui->videoListWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    ui->videoListWidget->setStyleSheet("QScrollBar{width:10px;background:#0A1626;}");
    
    
}

Widget::~Widget()
{
    delete ui;
}

void Widget::onRadioButtonClicked()
{
    int checkedId = mBtnGroup->checkedId();
    if(checkedId == 0){
        //列表模式
        ui->videoListWidget->setViewMode(QListView::ListMode);

    }else if(checkedId == 1){
        //图标模式
        ui->videoListWidget->setViewMode(QListView::IconMode); //设置为自适应
        
        ui->videoListWidget->setResizeMode(QListView::Adjust); //设置为自适应
        
        ui->videoListWidget->setMovement(QListView::Static); //设置为不可拖动
        
        ui->videoListWidget->setUniformItemSizes(true);
        
        //ui->videoListWidget->setGridSize(QSize(40, 40));
        
        ui->videoListWidget->setWordWrap(true);
        //超出文本不显示省略号
//        ui->videoListWidget->setTextElideMode(Qt::ElideNone);
    }
}

//单击信号槽的时候获取文本
void Widget::onItemClicked(QListWidgetItem *item)
{
    //ui->selectVideoFile->setText(item->text());
    QString mStr = item->text();    
    ui->selectVideoFile->setText(mStr);
    
    QFontMetrics  fontMetrics(ui->selectVideoFile->font());
    int fontSize = fontMetrics.width(mStr);
    if (fontSize > ui->selectVideoFile->width()) {
        //省略左边的内容(Qt::ElideLeft) 省略中间的内容(Qt::ElideMiddle) 省略中间的内容(Qt::ElideRight)
        ui->selectVideoFile->setText(fontMetrics.elidedText(mStr, Qt::ElideMiddle, ui->selectVideoFile->width()));
        ui->selectVideoFile->setToolTip(mStr);
    } else {
        ui->selectVideoFile->setText(mStr);
        ui->selectVideoFile->setToolTip("");
    }
}

//双击信号槽的时候变成可编辑的状态
void Widget::onItemDoubleClicked(QListWidgetItem *item)
{
    item->setFlags(Qt::ItemIsEditable | Qt::ItemIsSelectable | Qt::ItemIsEnabled);    
}

//添加VideoItem
void Widget::onBtnAddClicked()
{
    int iconIndex = QRandomGenerator::global()->generate()%5;//获取0-4的随机数
    QIcon icon(iconStringList[iconIndex]);
    
    QString strCurrentPath = QDir::homePath();//获取系统当前目录
    QString strDlgTitle = "请选择视频文件";//打开文件对话框标题
    QString strFilter = "MP4 Files(*.mp4);;WMV(*.wmv);;AVI(*.avi);;All Files(*.*)";//打开视频文件过滤器
    QList fileList = QFileDialog::getOpenFileNames(this, strDlgTitle, strCurrentPath, strFilter);
    
    for (int i= 0;i fileNameList = fileList[i].split(".mp4")[0].split("/");
            qDebug()<videoListWidget->addItem(item);
            
            /************************ Qt QListWidget项文本过长显示处理 ************************/
            //根据长度判断是否设置ToolTip            
            QFontMetrics fontMetrics(item->font());
            if (ui->videoListWidget->width() < fontMetrics.width(text)){
                item->setToolTip(text);
                text =fontMetrics.elidedText(text, Qt::ElideMiddle, ui->selectVideoFile->width());
            }
            item->setText(text);
            
            
            item->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled);
            ui->videoListWidget->setIconSize(QSize(30, 30));
            
            ui->videoListWidget->addItem(item);
//            int currentRow = fileAllList.length() - ui->videoListWidget->currentRow();
//            qDebug()<videoListWidget->currentRow();
//            qDebug()<videoListWidget->insertItem(currentRow,item);
        }
    }
    qDebug()<<"fileList:"<videoListWidget->currentRow();
    qDebug()<<"删除第几行："<videoListWidget->takeItem(row);
    delete item;
    ui->selectVideoFile->setText("");
    fileAllList.removeAt(row);
    qDebug()<<"fileAllList:"<

添加文件： 查看ListMode模式和IconMode模式

选中文件，查看文件，删除文件

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