Subclassing Adw.EntryRow

Platform
,
1

G’day!

I’m subclassing Adw.EntryRow and would like to prevent it from emitting the apply signal if it is invalid. I’ve played around with self.stop_emission_by_name("apply") but that just makes things weird.

Any help is most appreciated.

2

A workaround would be to handle the object’s own apply signal and emit an apply-valid signal conditional on the validation, but I’m still curious as to how I’d suppress apply itself conditionally.

Also, I’m using Gtk.Template and Gtk.Template.Callback in Python if that’s relevant.

3

Hi,

From what I see, it doesn’t seem something straightforward to do.
That would help if apply was a virtual method, but sadly it’s not the case.

Either go for your workaround, or monitor the entry’s content and hide the apply button when the conditions are not fulfilled.

4

I’ve gone with the workaround. Here it is:

@Gtk.Template(resource_path="/org/bswa/Leaftracker/ui/validated_entry_row.ui")
class ValidatedEntryRow(Adw.EntryRow):
    __gtype_name__ = "ValidatedEntryRow"

    def __init__(self):
        super().__init__()
        self._validate_entry: Callable[[str], bool] = lambda entry: True

    def entry_is_valid(self) -> bool:
        text = self.get_text()
        return self._validate_entry(text)

    def clear(self):
        self.set_text("")
        self.set_show_apply_button(False)
        self.set_show_apply_button(True)

    def set_validator(self, validator: Callable[[str], bool]):
        self._validate_entry = validator

    @Gtk.Template.Callback()
    def _on_changed(self, instance: Self) -> None:
        text = self.get_text()
        valid = self._validate_entry(text)
        self.set_show_apply_button(valid)

    @Gtk.Template.Callback()
    def _on_apply(self, instance: Self) -> None:
        if self.entry_is_valid():
            self.emit("apply-valid")

    @GObject.Signal
    def apply_valid(self) -> None:
        pass

<?xml version='1.0' encoding='UTF-8'?>
<interface>
    <template class="ValidatedEntryRow" parent="AdwEntryRow">
        <property name="show-apply-button">true</property>
        <signal name="changed" handler="_on_changed"/>
        <signal name="apply" handler="_on_apply"/>
    </template>
</interface>

Note that AFAIK, setting show-apply-button to false does not necessarily stop you applying. You can still hit enter? Haven’t tested so I’m not sure. Extending the control with a new signal seems a better pattern.

1 Like