which class need to be addressed to support drag'n drop between Qt app and finder

Question

I'm trying to build an app which list the folders and files from an Android device to finder and be able copy from/to PC.

I have done the class as below in my Browser.cpp

Browser::Browser(USBDevice dev, QWidget *parent) :
     QTreeWidget(parent)
{
    USBDevice MyDevice;

    MyDevice = dev;

    QMainWindow *window = new QMainWindow();

    window->setWindowTitle(QString::fromUtf8("PULS"));
    window->resize(600, 600);
    // window->setDragEnabled(true);
    //   window->setAcceptDrops(true);
    //   window->setMouseTracking(true);



    QWidget *centralWidget = new QWidget(window);

    QPushButton* CreateFolderButton = new QPushButton("Create Folder", centralWidget);
    CreateFolderButton->setFixedSize(100,20);
    //QVBoxLayout* Layout = new QVBoxLayout(centralWidget);
    //Layout->addWidget(CreateFolderButton);

    QPushButton* DeleteButton = new QPushButton("Delete", centralWidget);
    DeleteButton->setFixedSize(100,20);
    QVBoxLayout* Layout = new QVBoxLayout(centralWidget);
    Layout->addWidget(CreateFolderButton);
    Layout->addWidget(DeleteButton);

    QTreeWidget *MyTree = new QTreeWidget(centralWidget);
    Layout->addWidget(MyTree);
    MyTree->setSortingEnabled(true);
    MyTree->setColumnWidth(0, 400);
    MyTree->setDragDropMode(DragDrop);
    MyTree->setDropIndicatorShown(true);
    MyTree->setDragEnabled(true);
    MyTree->setMouseTracking(true);

    QTreeWidgetItem* headerItem = new QTreeWidgetItem();
    headerItem->setText(0,QString("File Name"));
    headerItem->setText(1,QString("Size (Bytes)"));
    headerItem->setText(2,QString("Date"));
    MyTree->setHeaderItem(headerItem);

    Recursive_Parse(MyTree, MyDevice.device_id, MyDevice.device_id->storage, 0, 0, 0);

    window->setCentralWidget(centralWidget);

    MyButtonGroup* group = new MyButtonGroup(MyTree, MyDevice, MyDevice.device_id, MyDevice.device_id->storage, centralWidget);
    group->addButton(CreateFolderButton);
    group->addButton(DeleteButton);

    window->show();
}

and the class in browser.h as

class Browser : public QTreeWidget
{
    Q_OBJECT
    public:
        Browser(USBDevice dev, QWidget* parent = 0);    
        void dragEnterEvent(QDragEnterEvent *event);
        void dropEvent(QDropEvent *event);
        void dragMoveEvent(QDragMoveEvent *event);
        void dragLeaveEvent(QDragLeaveEvent *event);
        ~Browser(){};
};

Drag'n drop is working in the Tree I can move stuff even if it's not working properly as I can drop a file on a file and create a child. By file, I just mean the TreeWidgetItem not the real file. This is also something I need to add but I do not know where.

But I do not see how to handle the dran'ndrop. I need to be able to control the drag'n drop inside the tree and outside to copy file from/to my computer.

It seems that :

        void dragEnterEvent(QDragEnterEvent *event);
        void dropEvent(QDropEvent *event);
        void dragMoveEvent(QDragMoveEvent *event);
        void dragLeaveEvent(QDragLeaveEvent *event);

Are never called... even if the drag'n drop works

Any idea how to handle event and overload or customised the behaviour ?

Thanks

why a -1 ??? I have removed my previous post with a similar question but with less details 6sec after this post — Seb, Nov 25 '14 at 19:02

score 0 · Answer 1 · answered Nov 25 '14 at 19:13

0

The class that has the dragEnterEvent and stuff overridden is named Browser, however you do not instantiate it, instead you instantiate QTreeWidget:

QTreeWidget *MyTree = new QTreeWidget(centralWidget);

So that is the reason why no members from Browser will get called. You perhaps wanted to write:

QTreeWidget *MyTree = new Browser(MyDevice, centralWidget);

Or something like that.

answered Nov 25 '14 at 19:13

Öö Tiib

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How to make it ? Sorry I'm newby – Seb Nov 25 '14 at 19:14
Browser is mostly the class who design the overall app : button, tree... and the TreeWidget used to display data. – Seb Nov 25 '14 at 19:26
Your complaint was that the member functions of Browser are not called. Indeed these are not when you drag and drop in something else. If Browser is entirely meant for something else then derive some other MyTreeWidget class from QTreeWidget, override dragEnterEvent et all of it and instantiate it. – Öö Tiib Nov 25 '14 at 19:52
this was my thought. Do what I have done to create browser for TreeWidget. – Seb Nov 25 '14 at 20:27
Sorry for these stupid question but I'm new in C++/Qt and have a very tiny deadline to learn, develop and deliver – Seb Nov 25 '14 at 20:28
No need to be sorry. C++ language and Qt framework are big and complex. It is extremely unlikely to learn to use effectively with short deadline. – Öö Tiib Nov 26 '14 at 07:38

which class need to be addressed to support drag'n drop between Qt app and finder

1 Answers1