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Passing a random GtkWidget and then searching its ancestors for an
EAlertSink turned out to be not as useful as I thought. Most of the
time we know about and have access to the widget that implements
EAlertSink, so just pass it directly as an EAlertSink.
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You can now amend the predefined actions in an EAlert by calling
e_alert_add_action(). Useful for adding actions from an existing
GtkUIManager.
Call e_alert_peek_actions() to obtain a combined list of predefined
and custom actions. These will typically serve as "related" actions
for GtkButtons (cf. gtk_activatable_set_related_action()).
Also, both EShellWindow and EShellView now implement EAlertSink. Use
EShellWindow for application-wide alerts, EShellView for view-specific
alerts.
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Trying out a new interface called EAlertSink. The idea is to centralize
how errors are shown to the user. A GtkWindow subclass would implement
the EAlertSink interface, which consists of a single method:
void (*submit_alert) (EAlertSink *alert_sink, EAlert *alert);
The subclass has complete control over what to do with the EAlert,
although I imagine we'll wind up implementing various alert-handling
policies as standalone widgets such as EAlertDialog. I'd like to try
an EAlertInfoBar.
Code that would otherwise display an error dialog itself would instead
pass the EAlert to an appropriate EAlertSink and be done with it.
Nothing is final yet. Still hacking on EAlert trying to find an API
that feels right for these use cases.
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