simpleclock: migrate to updateLabelAndTooltip (label + tooltip share the
localtime arg; default tooltip falls back to the label format).
systemd-failed-units: use setLabelMarkup/setTooltipMarkup dedup setters;
label/tooltip formats are selected by different conditions so the combined
helper does not apply.
upower: use setLabelMarkup for the label; tooltip stays a custom GTK widget.
mpd already uses the dedup setters (label/tooltip use different truncated
args), so no change.
Mouse-over tooltips set on the label only appear once the mouse hovers
over exactly the label. Other apps (e.g. firefox) show the tooltip once
the pointer hovers the button. Not solely its label. With this commit we
get the same behaviour.
The AButton class is designed as full a substitute to ALabel. The
GtkButton attribute 'button_' is initialized with a label. This
label can the be referenced by the subsequent inheritors of AButton
instead of the GtkLabel attribute 'label_' of ALabel.
For convenience a GtkLabel* 'label_' attribute is added to AButton.
If the button cannot be clicked it is disabled, effectively acting
like its label predecessor.
GtkButton seems to catch one-click mouse events regardless of the
flags set on it. Therefore, 'signal_pressed' is connected to a
function creating a fake GdkEventButton* and calling 'handleToggle'
(for details on this possible bug in GTK see:
https://stackoverflow.com/questions/45334911 )
In accordance with other GtkButtons (i.e. the sway/workspace ones)
set_relief(Gtk::RELIEF_NONE) is called on the 'button_' instance.
Alex