How to add content of text/sql file in QPlainTextEdit on QDropEvent.

deleted385

in the CodeEditor, a subclass of QPlainTextEdit I've these:

void CodeEditor::dragEnterEvent(QDragEnterEvent *event)
{
    QPlainTextEdit::dragEnterEvent(event);
}
void CodeEditor::dropEvent(QDropEvent *event)
{
    QFile file (event->mimeData()->text().remove("file:///"));
    file.open(QIODevice::ReadOnly);
    QTextStream in(&file);
    qDebug() << in.readAll();
    insertPlainText(in.readAll());
    //setPlainText(in.readAll());
    file.close();
}

when I drop .txt/..sql file on the CodeEditor, nothing happens:

How to add the content? In addition to that I also want to block drop (and change the cursor icon from copy (+) to block) if the file isn't .txt/.sql .

mchinand

I think the issue is/was that you're calling QTextstream::readAll() twice and there's nothing left to read after the first call. QTextstream's documentation doesn't explicitly say so, but
QIODevice::readAll() says it 'Reads all remaining data from the device'.

jsulm

@Emon-Haque said in How to add content of text/sql file in QPlainTextEdit on QDropEvent.:

nothing happens

What did you do already to fine out why it does not work?
Please use debugger and add a break point inside dropEvent and go through step by step.
Also check what file.open(QIODevice::ReadOnly) returns.

mchinand

Is the widget set to accept drop events? Do you know if anything in your dropEvent() is being run? Was the file open successful?

deleted385

@jsulm, this qDebug() << in.readAll() prints out all content in the QtCreator output, I can see content there.

deleted385

@mchinand, widget that contains the CodeEditor or the CodeEditor itself? In the constructor of the CodeEditor I've this setAcceptDrops(true);. Tried the same in the QWidget that contains the CodeEditor, doesn't work.

deleted385

@jsulm, somehow your trick works without any change of code. Just clicked the Start debugging of startup project button and kept hitting F5 and now it works!

I always used qDebug to observe and use Ctrl+R to run the project. Looks like those Play buttons actually have some use.

mchinand

I think the issue is/was that you're calling QTextstream::readAll() twice and there's nothing left to read after the first call. QTextstream's documentation doesn't explicitly say so, but
QIODevice::readAll() says it 'Reads all remaining data from the device'.

deleted385

@mchinand, correct. I've tried again with qDebug and that's the case.
Thanks.