Problem migrating AdwAboutWindow to AdwAboutDialog (with XML)

[yookoala (Koala Yeung)]

AdwAboutWindow is marked to be deprecated in libadwaita 1.6. From documentation AdwAboutDialog is supposed to be a drop-in replacement.

This is a AdwAboutWindow specification in XML format:

  <object class="AdwAboutWindow" id="about_dialog">
    <property name="visible">False</property>
    <property name="application-name" translatable="true">IBus Cangjie</property>
    <property name="developer-name" translatable="true">IBus Cangjie developers</property>
    <property name="website">https://cangjie.pages.freedesktop.org/</property>
    <property name="issue-url">https://gitlab.freedesktop.org/cangjie/ibus-cangjie/-/issues</property>
    <property name="copyright" translatable="true">© 2012 IBus Cangjie Developers</property>
  </object>

This works for my use.

But if I simply change the class:

  <object class="AdwAboutDialog" id="about_dialog">
    <property name="visible">False</property>
    <property name="application-name" translatable="true">IBus Cangjie</property>
    <property name="developer-name" translatable="true">IBus Cangjie developers</property>
    <property name="website">https://cangjie.pages.freedesktop.org/</property>
    <property name="issue-url">https://gitlab.freedesktop.org/cangjie/ibus-cangjie/-/issues</property>
    <property name="copyright" translatable="true">© 2012 IBus Cangjie Developers</property>
  </object>

This simply doesn’t show. And there is no error message. (You may test this on Workbench. The problem is exactly the same.)

What is my problem?

[Sid]

It works fine for me. Maybe an issue with WorkBench.

Wike uses AdwAboutDialog from .ui.

Refer https://github.com/hugolabe/Wike/blob/master/data/gtk/about.ui.

[yookoala (Koala Yeung)]

I heard the usage of Dialog is different from Window. I used to set the Window’s visible to False and then set it to True in script when needed. How do you trigger the display of this Dialog?

[yookoala (Koala Yeung)]

Found the solution.

Turns out AdwAboutDialog doesn’t work exactly like AdwAboutWindow. My old script used the visibility flag to toggle the appearance of the AdwAboutWindow:

# Show the about window
self.__builder.get_object("about_dialog").set_visible(True)

# Hide the about window
self.__builder.get_object("about_dialog").set_visible(False)

With AdwAboutDialog, I should instead use the present and close method.

# Show the about dialog on the parent window (self.__window)
self.__builder.get_object("about_dialog").present(self.__window)

# Hide the about dialog
self.__builder.get_object("about_dialog").close()