QTableView not displaying Icon for column zero

SGaist

Hi,

In addition to @mpergand checks, shouldn't your path start with ":/" since it's a file path and not a URL ?

Perdrix

@mpergand said in QTableView not displaying Icon for column zero:

@Perdrix
Check QIcon::isNull()

Roger- wilco

Perdrix

@SGaist said in QTableView not displaying Icon for column zero:

Hi,

In addition to @mpergand checks, shouldn't your path start with ":/" since it's a file path and not a URL ?

I don't know: The docs I am looking at say:

By default, resources are accessible in the application under the same file name as they have in the source tree, with a :/ prefix, or by a URL with a qrc scheme.
For example, the file path :/images/cut.png or the URL qrc:///images/cut.png would give access to the cut.png file, whose location in the application's source tree is images/cut.png. This can be changed using the file tag's alias attribute:
<file alias="cut-img.png">images/cut.png</file>

so I used the qrc::/// format - I will try the :/ format

SGaist

QIcon takes a file path, not a QUrl.

Perdrix

Gotcha

I changed the code to use :/ instead of qrc:/// and added code to the end of rowIcon() so the end of it now reads:

        if (ImageListModel::icons[index].isNull())
        {
            qDebug("null icon");
        }
        return ImageListModel::icons[index];
    }

and the qDebug line isn't triggered, so I guess the code is returning a valid QIcon.

Sadly no Icon is displayed :(

SGaist

What if you test with the full path to the file system ?

ChrisW67

Also check that your code is not exiting via the return in the switch default.

Perdrix

@ChrisW67 said in QTableView not displaying Icon for column zero:

Also check that your code is not exiting via the return in the switch default.

Yes, I checked that under the debugger - never hit that path.

Perdrix

@SGaist Aha! That was much more interesting:

So it looks like I can't use that form of static initialisation for the array of Icons. I'm somewhat surprised I didn't get that error when using the ":/" format!

I'll see what other solution I can come up with to initialise that array.

Thank you

Perdrix

I added this to the ctor:

    //
    // Populate the Icon array if it's not already been done
    //
    if (0 == ImageListModel::icons.size())
    {
        std::lock_guard lock(ImageListModel::mutex);
        if (0 == ImageListModel::icons.size())          // check for race condtion
        {
            ImageListModel::icons.emplace_back(":/stacking/LightColour.png");
            // etc
        }
    }

That worked just fine - thank you again for the push to try with filepaths which exposed the real issue.