Set editline text to path?
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So I have 2 GUIS, one directory browser and one main GUI, on the main GUI there's a line edit. Whenever I go to directory browser, select a directory and then click a button, the path should appear on the line edit, but it doesn't. It doesnt, can someone please check what I did wrong?
from directoryexplorer.cpp
@void directoryExplorer::on_selectButton_clicked()
{
if(ui->treeView->selectionModel()->hasSelection()){
QModelIndex i = ui->treeView->selectionModel()->currentIndex();
QString path = mmodel->fileInfo(i).absoluteFilePath();
MainWindow o;
o.fillInOutput(path);
}
}@from mainwindow.cpp
@void MainWindow::fillInOutput(QString fpath){
ui->lineEditOutput->setText(fpath);
}
@ -
Of course it doesn't work like that.
@
MainWindow o; //o is a local variable, not your main window
o.fillInOutput(path);
} //o is destroyed here.
@
This sounds like a job for signals and slots. In your directoryExplorer header add signal:
@signals:
void pathChanged(QString);
@
and replace the code above with
@emit pathChanged(path);
@
In the main window connect to that signal:
connect(<yourDirExplorerPointer>, directoryExplorer::pathChanged, this, MainWindow::fillInOutput); -
[quote author="Chris Kawa" date="1397316003"]Of course it doesn't work like that.
@
MainWindow o; //o is a local variable, not your main window
o.fillInOutput(path);
} //o is destroyed here.
@
This sounds like a job for signals and slots. In your directoryExplorer header add signal:
@signals:
void pathChanged(QString);
@
and replace the code above with
@emit pathChanged(path);
@
In the main window connect to that signal:
connect(<yourDirExplorerPointer>, directoryExplorer::pathChanged, this, MainWindow::fillInOutput);[/quote]Thanks but I don't understand the last instruction. I wrote
connect(<de>, directoryExplorer::pathChanged, this, MainWindow::fillInOutput);because I'm sure that's my pointer, is it not? I wrote it in the header like this : directoryExplorer de;
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I meant <yourDirExplorerPointer> as a placeholder, sorry.
connect() expects a pointer so in your case, since you have a stack variable de, you need to pass its address:
@connect(&de, directoryExplorer::pathChanged, this, MainWindow::fillInOutput);@The call to connect should be placed in an initializing function of your MainWindow eg. in the constructor.
I think it would be good for you to get back to some C++ basics before you start with Qt. It's only going to get harder. Without knowing what pointers are or what a variable scope will be you're gonna struggle a lot.
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[quote author="Chris Kawa" date="1397323784"]I meant <yourDirExplorerPointer> as a placeholder, sorry.
connect() expects a pointer so in your case, since you have a stack variable de, you need to pass its address:
@connect(&de, directoryExplorer::pathChanged, this, MainWindow::fillInOutput);@The call to connect should be placed in an initializing function of your MainWindow eg. in the constructor.
I think it would be good for you to get back to some C++ basics before you start with Qt. It's only going to get harder. Without knowing what pointers are or what a variable scope will be you're gonna struggle a lot.[/quote]
Yeah probably, I watched most of thenewboston's tutorials (skipped the last 15) but I keep on forgetting about everything, I should probably pick up a book rather than watching videos
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Chris: I think you need to get the pointer of the class member function for the connect to work?
@
&directoryExplorer::pathChanged
@
instead of
@
directoryExplorer::pathChanged
@
?I've also told glowdemon1 to learn the c++ basics first (in another thread), it will certainly help. and I think you should also learn how to interpret compiler errors, because most of your problems are syntax errors and show during compilation.
Btw: how can i escape the at-sign in this forum? lol
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@Xander84 - yeah, of course, sorry for that. My mind was somewhere else when I typed that.
The formatting on this forum is the most mind-boggling thing ever.
It's suppose to be "textile":http://qt-project.org/wiki/TextileSyntax but not really :P
To use @ in your text you can either have just one in the whole text or use html entity: @
Also, if you use @ inside a code tag without whitespace like this:
@a@b@c@ it will use the outer ones for code and the inner ones as text. If you have couple of them next to each other neighbored by a character eg. a@@@ it will print them all.
I would love to see the code for that parser one day :P
