droplabel.cpp

#include "droplabel.h"




DropLabel::DropLabel(QWidget *parent, const QStringList &extensions) //drag and drop box
:QLabel(parent), extensions(extensions)
{
    setAcceptDrops(true);
    setAlignment(Qt::AlignCenter);
    setText("Drop a file here");
    setStyleSheet("border: 2px dashed gray;");
}


void DropLabel::dragEnterEvent(QDragEnterEvent *event){
    //user puts some files above the box, if it doesn't have any file expected reject
    auto storage = event->mimeData()->urls();
    for (const auto &file: storage){
        for (const auto &extension : extensions){
            if(file.toLocalFile().toLower().endsWith(extension.toLower())){event->acceptProposedAction();return;}}
    }
    event->ignore();
}


void DropLabel::dropEvent(QDropEvent *event){
    //user drops the files, filter and use only the expected files
    auto storage = event->mimeData()->urls();
    QStringList list_;
    for (const auto &file: storage){
        for (const auto &extension : extensions){
            if(file.toLocalFile().toLower().endsWith(extension.toLower())){
                list_.append(file.toLocalFile());
            }
        }
    }
    emit fileDropped(list_);
}


void DropLabel::mousePressEvent(QMouseEvent *){
    //user clics on the box, call explorer and allow it to chose only the expected files
    QStringList path = QFileDialog::getOpenFileNames(this, "Chose files", "", "All files (*)");
    if(path.size() != 0){
        emit fileDropped(path);
    }
}