Qt4/Win32 - Reimplementing Copy

[gesslar]

I have a GDoc which is a subclass of QTextEdit.

I want to re-implement copy/paste functionality of it because I want to manipulate the data before releasing it.

void GDoc::copy() {
    QTextEdit::copy();
    QClipboard *clip = QApplication::clipboard();
    QString work = clip->text();
 
    if(work.length() <= 79) return ;
    QStringList blocks = work.split("\n");
    bool done = false;
    for(int i  = 0; i < blocks.count(); i++) {
        int left = 0;
        int right = 79;
        QStringList inner;
        if(blocks[i].length() <= 79) continue;
        do {
            QString sec = blocks[i].mid(left, right);
            int pos = sec.lastIndexOf(QChar(32));
            if(pos == -1) {
                inner.append(sec.trimmed());
                blocks[i].remove(0,79);
            } else {
                inner.append(sec.mid(0,pos).trimmed());
                blocks[i].remove(0,pos+1);
            }
            if(blocks[i].length() < 79) {
                inner.append(blocks[i]);
                blocks[i] = inner.join("\n");
                done = true;
            }                                
    } while ( !done );
        done = false;
    }
    clip->setText(blocks.join("\n"));
}

void GDoc::copy() {
    QTextEdit::copy();
    QClipboard *clip = QApplication::clipboard();
    QString work = clip->text();

    if(work.length() <= 79) return ;
    QStringList blocks = work.split("\n");
    bool done = false;
    for(int i  = 0; i < blocks.count(); i++) {
        int left = 0;
        int right = 79;
        QStringList inner;
        if(blocks[i].length() <= 79) continue;
        do {
            QString sec = blocks[i].mid(left, right);
            int pos = sec.lastIndexOf(QChar(32));
            if(pos == -1) {
                inner.append(sec.trimmed());
                blocks[i].remove(0,79);
            } else {
                inner.append(sec.mid(0,pos).trimmed());
                blocks[i].remove(0,pos+1);
            }
            if(blocks[i].length() < 79) {
                inner.append(blocks[i]);
                blocks[i] = inner.join("\n");
                done = true;
            }                                
    } while ( !done );
        done = false;
    }
    clip->setText(blocks.join("\n"));
}

To copy to clipboard, switch view to plain text mode 

Simply, the above takes a bunch of text, and forces line-wrapping at a specified column and then sends that to the clipboard ready to be pasted as prescribed.

If I call the copy() function from my application, say from a menu, or toolbar it works. When I hit Ctlr-C, it does not work.

So! I had this brilliant idea of capturing the Ctrl-C event!

void GDoc::keyPressEvent( QKeyEvent *e) {
    if(e->key() == Qt::Key_Tab && !(e->modifiers() | Qt::NoModifier)) {
        insertPlainText(pad());  // Replace tab character with 4 spaces
        e->accept();
        return ;
    } else if (e->key() == Qt::Key_C && (e->modifiers() | 
        Qt::ControlModifier)) {
        copy();
        e->accept(); 
    }
    QTextEdit::keyPressEvent(e);
}

void GDoc::keyPressEvent( QKeyEvent *e) {
    if(e->key() == Qt::Key_Tab && !(e->modifiers() | Qt::NoModifier)) {
        insertPlainText(pad());  // Replace tab character with 4 spaces
        e->accept();
        return ;
    } else if (e->key() == Qt::Key_C && (e->modifiers() | 
        Qt::ControlModifier)) {
        copy();
        e->accept(); 
    }
    QTextEdit::keyPressEvent(e);
}

To copy to clipboard, switch view to plain text mode 

Now, I put a test QMessageBox::information throughout the Copy code and it DOES get executed, but when I paste anywhere the data is unchanged. I think that the clipboard is getting over-written afterwards, it's the only explanation. I honestly don't know, but would SERIOUSLY appreciate some help.

I have some code I want to do for pasting, but if it's going to behave like this I might just forget it.

[gesslar]

Damnit...ok, easy. I forgot to put a return in the if statement which handles the ctrl-c