Thumbnail view

MTK358 · 08-06-2010, 09:36 AM

How to I make a list of thumbnails in Qt, kind of like the "Icon View" in many GUI file managers?

Sergei Steshenko · 08-06-2010, 10:06 AM

Quote:

Originally Posted by MTK358

How to I make a list of thumbnails in Qt, kind of like the "Icon View" in many GUI file managers?

How is it Qt-specific ?

Scan (opendir, readdir) image files in the directory, resize them internally and display the images by Qt means.

MTK358 · 08-06-2010, 10:16 AM

I was thinking a file view-like thing, where you are able to select the thumbnails.

Sergei Steshenko · 08-06-2010, 10:19 AM

Quote:

Originally Posted by MTK358

I was thinking a file view-like thing, where you are able to select the thumbnails.

Selecting is mouse click registering, i.e. you need to read about mouse events in Qt.

And in addition probably mouse movement registering - there should be events related to mouse entering an leaving widget area.

MTK358 · 08-06-2010, 11:54 AM

So you mean like the icon/thumbnail view in a Qt file manager is *not* a Q(List|Column|Table|Tree)View?

Sergei Steshenko · 08-06-2010, 12:01 PM

Quote:

Originally Posted by MTK358

So you mean like the icon/thumbnail view in a Qt file manager is *not* a Q(List|Column|Table|Tree)View?

I do not know Qt, so I can't answer your question specifically.

But I think you should split your problem into three:

establishment of files <-> small images relationship;
graphical display of the above small images (e.g. buttons showing them);
actions in response to clicking/selecting entities with the small images.

.

There is bunch of Qt-based file managers and image viewers - yes, you will have to go through code written by others.

MTK358 · 08-09-2010, 04:06 PM

I found that QList actually does this, it has an Icon Mode, but the problem is how do I attach a QFileSystemModel (which is a tree) to it to list a certain directory?

MTK358 · 08-10-2010, 01:03 PM

Instead, I decided to try a QListWidget (not a QListView) and populate it like this:

Code:

QDirIterator i("/home/michael/Pictures");
while (i.hasNext())
{
    i.next();
    ui->fileList->addItem(new QListWidgetItem(QIcon(i.filePath()), i.fileName()));
}

But is has some problems:

It takes a REALLY long time to show, and it loads the CPU quite heavily just scrolling throught it.
What if the file is not an image file?
The icons aren't in a neat grid, instead they are scattered in an ugly fashion.

dugan · 08-10-2010, 01:44 PM

I would write my own model.

Sergei Steshenko · 08-10-2010, 02:09 PM

Quote:

Originally Posted by MTK358

Instead, I decided to try a QListWidget (not a QListView) and populate it like this:

Code:

QDirIterator i("/home/michael/Pictures");
while (i.hasNext())
{
    i.next();
    ui->fileList->addItem(new QListWidgetItem(QIcon(i.filePath()), i.fileName()));
}

But is has some problems:

It takes a REALLY long time to show, and it loads the CPU quite heavily just scrolling throught it.
What if the file is not an image file?
The icons aren't in a neat grid, instead they are scattered in an ugly fashion.

How about putting away excuses and looking into source code of, say 'konqueror' ?

MTK358 · 08-10-2010, 02:27 PM

Quote:

Originally Posted by Sergei Steshenko

How about putting away excuses and looking into source code of, say 'konqueror' ?

I'd like to, but I am basically worthless at reading code that someone else wrote. Especially the relationships between all to files, functions, objects, etc.

Sergei Steshenko · 08-10-2010, 02:30 PM

Quote:

Originally Posted by MTK358

I'd like to, but I am basically worthless at reading code that someone else wrote. Especially the relationships between all to files, functions, objects, etc.

So, work on yourself. And starting from 'main' build the hierarchy.

And there are tools (start from 'ctags', 'cscope' and similar) and IDEs which help to understand "relationships between all to files, functions, objects, etc".