How to set selected filter on QFileDialog?

Question

I have a open file dialog with three filters:

QString fileName = QFileDialog::getOpenFileName(
        this,
        title,
        directory,
        tr("JPEG (*.jpg *.jpeg);; TIFF (*.tif);; All files (*.*)")
);

This displays a dialog with "JPEG" selected as the default filter. I wanted to put the filter list in alphabetical order so "All files" was first in the list. If I do this however, "All files" is the default selected filter - which I don't want.

Can I set the default selected filter for this dialog or do I have to go with the first specified filter?

I tried specifying a 5th argument ( QString ) to set the default selected filter but this didn't work. I think this might only be used to retrieve the filter that was set by the user.

Answer 1

Like this:

QString selfilter = tr("JPEG (*.jpg *.jpeg)");
QString fileName = QFileDialog::getOpenFileName(
        this,
        title,
        directory,
        tr("All files (*.*);;JPEG (*.jpg *.jpeg);;TIFF (*.tif)" ),
        &selfilter 
);

The docs are a bit vague about this, so I found this out via guessing.

Answer 2

这是所有 QT 支持的图像格式的字符串。

"All files (*.*);;BMP (*.bmp);;CUR (*.cur);;GIF (*.gif);;ICNS (*.icns);;ICO (*.ico);;JPEG (*.jpeg);;JPG (*.jpg);;PBM (*.pbm);;PGM (*.pgm);;PNG (*.png);;PPM (*.ppm);;SVG (*.svg);;SVGZ (*.svgz);;TGA (*.tga);;TIF (*.tif);;TIFF (*.tiff);;WBMP (*.wbmp);;WEBP (*.webp);;XBM (*.xbm);;XPM (*.xpm)"