Your First Factory: GtkListView and the Bind/Unbind Rhythm
This is the fourth entry in A Field Guide to GTK Widgets — a series about which widget to reach for, when, and what bites you when you do. The previous post got a list on screen with a factory it deliberately didn't explain. This one explains it. The complete, runnable code lives in the companion repo . Where we left off The list-mindset post got a GtkListView on screen with just enough factory…
This article explains the GtkListView widget in GTK and the bind/unbind signal pair that is crucial for proper row recycling. The previous post in the series built a list using a factory but didn't delve into the details of how the factory works. GtkListView uses row recycling to efficiently scroll through large numbers of items without creating new rows.
The bind signal is where most of the logic lives, attaching data from the item to the widget tree, and it runs every time GTK assigns a row slot to an item, including when the same row is reused. The setup signal builds the widget tree once per recycled row slot, while unbind undoes what bind did before the row slot is reassigned to a different item.
Teardown is the least used signal, which destroys the widget tree for good. The article highlights a common issue where bind and unbind signals are not properly paired. If bind sets up a CSS class but forgets to remove it in unbind, the class remains even when the task status changes. This can result in a task appearing dim for no reason.
The recommended solution is to treat bind and unbind as a symmetrical pair, ensuring both signals are handled to avoid such issues.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
