qt 窗口实现打开文件夹浏览资源（纯代码实现，后附代码）

新建 widget 项目可参考

QT入门初学者——如何新建一个工程项目(详细)_guuuuug的博客-CSDN博客_qt新建工程

实现界面，点击浏览会打开文件夹

选中文件，窗口显示文件名，文件路径

过长的文字会在最后显示...，鼠标悬浮在文字栏会显示全部文字。

点击右下角打开可以实现打开目标文件目录（0 ~ 4个），点击清除可以清除全部

代码实现：

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QPushButton>
#include <QApplication>
#include <QDialog>
#include <QLabel>
#include <QString>
#include <QFileDialog>
#include <QDialogButtonBox>
#include <QDesktopServices>
namespace Ui {
class Widget;

}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private slots:
    void on_lineEdit_textChanged( );
    void on_lineEdit( );

private:
    Ui::Widget *ui;

    QPushButton *b1;
    QLabel *label;
    QLabel *label1;

    QPushButton *b2;
    QLabel *label2;
    QLabel *label22;

    QPushButton *b3;
    QLabel *label3;
    QLabel *label133;

    QPushButton *b4;
    QLabel *label4;
    QLabel *label144;

    QPushButton *b10;
    QPushButton *b11;

};

#endif // WIDGET_H

widget.cpp

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

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    b1 = new QPushButton;
    b2 = new QPushButton;
    b3 = new QPushButton;
    b4 = new QPushButton;
    label = new QLabel;
    label1 = new QLabel;
    label2 = new QLabel;
    label22 = new QLabel;
    label3 = new QLabel;
    label133 = new QLabel;
    label4 = new QLabel;
    label144 = new QLabel;

    b1->setParent(this);
    b1->setText("浏览");
    b1->setGeometry(420,50,50,30);

    label->setParent(this);
    label->setGeometry(20,50,100,30);
    label->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    label1->setParent(this);
    label1->setGeometry(150,50,250,30);
    label1->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    b2->setParent(this);
    b2->setText("浏览");
    b2->setGeometry(420,100,50,30);

    label2->setParent(this);
    label2->setGeometry(20,100,100,30);
    label2->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    label22->setParent(this);
    label22->setGeometry(150,100,250,30);
    label22->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    b3->setParent(this);
    b3->setText("浏览");
    b3->setGeometry(420,150,50,30);

    label3->setParent(this);
    label3->setGeometry(20,150,100,30);
    label3->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    label133->setParent(this);
    label133->setGeometry(150,150,250,30);
    label133->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    b4->setParent(this);
   b4->setText("浏览");
    b4->setGeometry(420,200,50,30);

    label4->setParent(this);
    label4->setGeometry(20,200,100,30);
    label4->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");

    label144->setParent(this);
    label144->setGeometry(150,200,250,30);
    label144->setStyleSheet("QLabel{background-color:rgb(255,255,255);}");
    b10 = new QPushButton;
    b10->setParent(this);
    b10->setGeometry(300, 255, 50, 20);
    b10->setText("打开");
    b11 = new QPushButton;
    b11->setParent(this);
    b11->setGeometry(380, 255, 50, 20);
    b11->setText("清除");

    //槽函数的两种写法
    //connect(b1, SIGNAL(clicked()), this, SLOT(on_lineEdit_textChanged()));  写法1
    connect(b1, &QPushButton::clicked, this, &Widget::on_lineEdit_textChanged);  //写法2
    connect(b2, &QPushButton::clicked, this, &Widget::on_lineEdit_textChanged);
    connect(b3, &QPushButton::clicked, this, &Widget::on_lineEdit_textChanged);
    connect(b4, &QPushButton::clicked, this, &Widget::on_lineEdit_textChanged);
    b1->setObjectName("1");
    b2->setObjectName("2");
    b3->setObjectName("3");
    b4->setObjectName("4");

    connect(b10, &QPushButton::clicked, this, &Widget::on_lineEdit);
    connect(b11, &QPushButton::clicked, this, &Widget::on_lineEdit);
    b10->setObjectName("10");
    b11->setObjectName("11");
}

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

void Widget::on_lineEdit_textChanged( )
{
    QString fullPath = QFileDialog::getOpenFileName();
    QString filename, filePath;
    QFileInfo fileInfo = QFileInfo(fullPath);
    //文件名
    filename = fileInfo.fileName();

    //绝对路径l
    filePath = fileInfo.absolutePath();

    QFontMetrics fontWidth(label1->font());//得到每个字符的宽度
    QString elideNote = fontWidth.elidedText(filePath, Qt::ElideRight, 250);//最大宽度250像素
    QString fileName = fontWidth.elidedText(filename, Qt::ElideRight, 100);//最大宽度100像素

    QPushButton* btn= qobject_cast<QPushButton*>(sender());
    QString str = btn->objectName();

    if(str == "1"){
        label->setText(fileName);
        label->setToolTip(filename);
        label1->setText(elideNote);
        label1->setToolTip(filePath);

      }
    if(str == "2"){
        label2->setText(fileName);
        label2->setToolTip(filename);
        label22->setText(elideNote);
        label22->setToolTip(filePath);
      }
    if(str == "3"){
        label3->setText(fileName);
        label3->setToolTip(filename);
        label133->setText(elideNote);
        label133->setToolTip(filePath);
      }
    if(str == "4"){
        label4->setText(fileName);
        label4->setToolTip(filename);
        label144->setText(elideNote);
        label144->setToolTip(filePath);
      }

}

void Widget::on_lineEdit(){
    QPushButton* btn= qobject_cast<QPushButton*>(sender());
    QString str = btn->objectName();

    if(str == "10"){
        QString st= label1->toolTip();
        QDesktopServices::openUrl(QUrl::fromLocalFile(st));
        QString st1= label22->toolTip();
        QDesktopServices::openUrl(QUrl::fromLocalFile(st1));
        QString st2= label133->toolTip();
        QDesktopServices::openUrl(QUrl::fromLocalFile(st2));
        QString st3= label144->toolTip();
        QDesktopServices::openUrl(QUrl::fromLocalFile(st3));
    }

    else if(str == "11"){
        label->clear();
        label1->clear();
        label1->setToolTip(" ");

        label2->clear();
        label22->clear();
        label22->setToolTip("");

        label3->clear();
        label133->clear();
        label133->setToolTip("");

        label4->clear();
        label144->clear();
        label144->setToolTip("");
    }

}

main.cpp

#include "widget.h"
#include <QApplication>
#include <QDialog>
#include <QLabel>
#include <QString>
#include <QFileDialog>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.resize(500,300);
    w.show();

    return a.exec();
}

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QT GUI编程_子羽丿的博客-CSDN博客