what qwidget subclass?

user4592357

i need a widget that will have borders and an icon inside it (in the center of the widget), so i decided to use QFrame since it has a QFrame::Box property, and i'm drawing a pixmap on it but something is wrong. here's my code:

class myWidget : public QFrame {

    Q_OBJECT

public:

   myWidget(const QString &iconPath, QWidget *parent = nullptr);

    virtual ~myWidget() override {}

protected:

    virtual void paintEvent(QPaintEvent *event) override;

private:

    QPixmap pixmap;

};

implementation:

myWidget::myWidget(const QString &iconPath, QWidget *parent /* = nullptr */) : QFrame(parent) {

    setAttribute(Qt::WA_TranslucentBackground);
    setFixedSize(140, 180);
    setFrameStyle(QFrame::Box);

    pixmap.load(iconPath);
}

void myWidget::paintEvent(QPaintEvent */* event */) {
    QPainter painter(this);
    painter.drawPixmap(0, 0, width(), height() / 2, pixmap);
}

not only i don't get borders drawn around the widget, but also no icon loaded (actually, when i remove the paintEvent(), the border is drawn (because of QFrame::Box) but not with it).

this is how i use the class:

auto layout = new QVBoxLayout;
layout->addWidget(new myWidget(icon-full-path, this));
// etc...

the icon-full-path contains "\\"s instead of "\"s, just in case, but no icon is displayed

i've also tried using all "/"s but no success

please help!

mrjj

Hi
You must call the base class's paintEvent so it can draw the border

void myWidget::paintEvent(QPaintEvent event ) {
QFrame::paintEvent(event); // let base class paint
....

About the icon.
Are you use external file ?
Try with resource file and that syntax
Like ":/SMSicons/foo.png"
http://doc.qt.io/qt-5/resources.html

user4592357

but QPixmap can load from QString only, that's why i changed it from QIcon.

and yes, i'll need to load external files too so that's another problem

mrjj

@user4592357
Hi
If you need to load external files, where will they be placed ?
The user will point to them ?

Using a Resources file, includes the images in the exe file and can be loaded with QString and pixmap.

user4592357

the user will provide a path to the image, and i should go get the image from the path and display it in the widget

EDIT: i was able to draw using an entry from qrc but what should i do with that user provided icon paths?

mrjj

@user4592357

Ok, sounds like a normal file open dialog
http://www.codebind.com/cpp-tutorial/qt-tutorial/qt-tutorials-beginners-qfiledialog-getopenfilename-example/

Then load it via pixmap. Should just work.

user4592357

@mrjj

no i don't need to show a dialog, i just need to go and grab the image located in the user-specified path

mrjj

@user4592357
Ok, i see no reason it should not work if the paths are fully qualified and
valid.

I would test that
qDebug() << "loading: " pixmap.load(iconPath);
says true
also i would try with

#include <QFileInfo>

bool fileExists(QString path) {
    QFileInfo check_file(path);
    // check if file exists and if yes: Is it really a file and no directory?
    return check_file.exists() && check_file.isFile();
}

and check iconPath where u try to load the image.

Also where does icon-full-path come from ?
Is it in the app or do you load from text file ?

user4592357

thanks. i'll read a text file for that, but why does that matter?

mrjj

@user4592357
Well if inside the app you must escape

c:\\xxx\\cyy\\

But that is not valid if from text file so just asking to try to guess reason that is not shown :)

user4592357

@mrjj

QFile::exists() gives false when i use a full path for the image (like, C:\Users\user\image.png). but the file sure exists. i've tried using \\ instead of \, also / but not much success. with resource system, however, everything is okay

mrjj

@user4592357
if you take one of the paths from the file
and start paintbrush, select file->open
and paste the path into the filename area. and then press open.
will it then open ?

it sounds really, really wrong if QFile::exists() says false.

user4592357

@mrjj

yes it opens.

this is weird, really.
this works:

QFileInfo file("C:\Users\user\image.png");
setIcon(file.filePath());

but when i get the SAME line from a file and set the icon to it... it doesn't work

mrjj

Hi
Did you try to qDebug() << file.filePath();
to see if anything still 100% like the one in file?

user4592357

@mrjj

yes they're the same, actually i've copied them

mrjj

@user4592357
Really cannot guess then.
If path in text file truely are valid syntax, it should just work.
and you are 100% sure you escape it ?
( which is needed when inside the code, but from text file)

setIcon("C:\\Users\\user\\image.png");

user4592357

@mrjj

yes i've tried everything

okay, thanks anyways

mrjj

@user4592357
I have done it many times so I do
wonder what you do that is
different or if it really just is a path issue.

user4592357

@mrjj

it's really just a path

i even tried to QDir::toNativeSeparators(). nothing works

SGaist

Hi,

Since you are using Qt, why not use the Unix notation ? Qt handles the conversion when it calls the related platform specific functions.

So it should be C:/Users/user/image.png