Suggestions/Ideas about a file browser

[SkripT]

I'd say, forget about the QListWidget and use a QDirModel+QListView instead..

jpn I appreciate your suggestion but can you give me some reasons and how you think that I should use the list view?

[jpn]

Because it's this simple:

#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
	// a "file manager" at simplest :)
	QSplitter* splitter = new QSplitter;
	QDirModel* model = new QDirModel;
	QTreeView* tree = new QTreeView(splitter);
	tree->setModel(model);
	QListView* list = new QListView(splitter);
	list->setModel(model);
	list->setDragEnabled(true);
	splitter->show();
 
	// tree navigation by click
	QObject::connect(tree, SIGNAL(clicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// list navigation by dbl click
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// update tree upon list change
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		tree, SLOT(setCurrentIndex(const QModelIndex&)));
 
	a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
    return a.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

	// a "file manager" at simplest :)
	QSplitter* splitter = new QSplitter;
	QDirModel* model = new QDirModel;
	QTreeView* tree = new QTreeView(splitter);
	tree->setModel(model);
	QListView* list = new QListView(splitter);
	list->setModel(model);
	list->setDragEnabled(true);
	splitter->show();

	// tree navigation by click
	QObject::connect(tree, SIGNAL(clicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// list navigation by dbl click
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// update tree upon list change
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		tree, SLOT(setCurrentIndex(const QModelIndex&)));
	
	a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
    return a.exec();
}

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Notice the amount of code ..with this, you can already drag'n drop a file from the list view to e.g. desktop..

[SkripT]

Cool jpn thanks , where have you get this example? Is it from your creation?

[jpn]

No problem. Yep, I did it myself..
It's not a complete solution, just a small example demonstrating the power of QDirModel

[invictus]

Because it's this simple:

#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
	// a "file manager" at simplest :)
	QSplitter* splitter = new QSplitter;
	QDirModel* model = new QDirModel;
	QTreeView* tree = new QTreeView(splitter);
	tree->setModel(model);
	QListView* list = new QListView(splitter);
	list->setModel(model);
	list->setDragEnabled(true);
	splitter->show();
 
	// tree navigation by click
	QObject::connect(tree, SIGNAL(clicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// list navigation by dbl click
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// update tree upon list change
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		tree, SLOT(setCurrentIndex(const QModelIndex&)));
 
	a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
    return a.exec();
}

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

	// a "file manager" at simplest :)
	QSplitter* splitter = new QSplitter;
	QDirModel* model = new QDirModel;
	QTreeView* tree = new QTreeView(splitter);
	tree->setModel(model);
	QListView* list = new QListView(splitter);
	list->setModel(model);
	list->setDragEnabled(true);
	splitter->show();

	// tree navigation by click
	QObject::connect(tree, SIGNAL(clicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// list navigation by dbl click
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		list, SLOT(setRootIndex(const QModelIndex&)));
	// update tree upon list change
	QObject::connect(list, SIGNAL(doubleClicked(const QModelIndex&)),
		tree, SLOT(setCurrentIndex(const QModelIndex&)));
	
	a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
    return a.exec();
}

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Notice the amount of code ..with this, you can already drag'n drop a file from the list view to e.g. desktop..

Nice... is there any way you can go back to the parent of the "current" modelindex? Or does setRootIndex() overwrite everything "above" the defined index?

I am using a QTreeView with
view->setRootIsDecorated(false);
view->setItemsExpandable(false);

So I can only see the top level list.

[jpn]

You can get the parent via QModelIndex::parent(). If you want to provide a button with "go one level up" -functionality, the slot connected to button's SIGNAL(clicked()) would do roughly:

QModelIndex parent = view->rootIndex().parent();
view->setRootIndex(parent);
button->setEnabled(parent.parent().isValid());

QModelIndex parent = view->rootIndex().parent();
view->setRootIndex(parent);
button->setEnabled(parent.parent().isValid());

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[invictus]

You can get the parent via QModelIndex::parent(). If you want to provide a button with "go one level up" -functionality, the slot connected to button's SIGNAL(clicked()) would do roughly:

QModelIndex parent = view->currentIndex().parent();
view->setCurrentIndex(parent);
button->setEnabled(parent.parent().isValid());

QModelIndex parent = view->currentIndex().parent();
view->setCurrentIndex(parent);
button->setEnabled(parent.parent().isValid());

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This seem to work fine...until I select an item. Then the up-action will no longer work for some reason. Although I am using setRootIndex instead of setCurrentIndex in order to show a flat structure instead of a tree.

[jpn]

This seem to work fine...until I select an item. Then the up-action will no longer work for some reason. Although I am using setRootIndex instead of setCurrentIndex in order to show a flat structure instead of a tree.

Oops, sorry. Those should've been rootIndex() and setRootIndex(). Thanks for pointing it out. I have corrected it to my previous post..

[invictus]

Oops, sorry. Those should've been rootIndex() and setRootIndex(). Thanks for pointing it out. I have corrected it to my previous post..

Yeah, but thats when it is not working, unfortunately

[mchara]

hello all,
and what about providing custom class inherited from QFileIconProvider (QDirModel::setIconProvider()) that generates thumbnails? My app generates them in separate thread & stores thumbnails in xmlfile in each directory it works great, maybe with similar ithumbsProvider you could have only one QTreeView with thumbnails inside & drag&drop functionalities?

[jpn]

QtCentreWiki: Extended Dir View example

[invictus]

QtCentreWiki: Extended Dir View example

Nice example. Thanks.

But one question. When you doubleclick the treeview it will enter the clicked item...but if the item selected isnt the first column it will not enter the correct directory. Any thoughts on that?

[mchara]

connect clicked(const QModelIndex &) or doubleClicked(const QModelIndex &) signal to slot that setRootIndex ( const QModelIndex & ) for index in first column & the same row as passed in signal...

[jpn]

But one question. When you doubleclick the treeview it will enter the clicked item...but if the item selected isnt the first column it will not enter the correct directory. Any thoughts on that?

Thanks for the bug report. It's fixed now.

[invictus]

Speaking of problems...

This is my goTo slot (much like your setRootIndex):

void goTo(const QModelIndex &dir)
{
if(dirModel->isDir(dir))
{
dirView->setRootIndex(dir);
addressField->setText(dirModel->filePath(dir));
upAction->setEnabled(dir.isValid());
}
}

dirView is a QTreeView. The problem is that when the up method is run (which run goTo() with the parent() of the dirView rootIndex like in your example) the program just quits/crashes. If I comment the if(dirView->isDir()) line it works.

[astrude]

hello.// how an i load the files from the file list so that i an get its directory to load the file itself to transfer it to another device..thanks!

[giacomelli.fabio]

Hi I'm doing that thing with the contents of clipboard.. ( a simple enumeration )

const QMimeData *mime = QApplication::clipboard()->mimeData();
if (mime && mime->hasUrls()) {
QStringList fileList;
foreach(QUrl url, mime->urls())
fileList.append(url.toLocalFile());
........
But If clipboard was filled by a windows application I can't know if I I need to copy or cut ..... do you know a trick ????