ListView anchor to bottom

[peiyangli]

Feature Description

In a chat window. My ListView elements are all different heights and using self.viewport-y calculations is not accurate and I need the functionality for the ListView to anchor to the bottom, or reverse the listview(not model) is OK.

Product Impact

Customer service chat client

[ogoffart]

There is some code for that in the Slint live preview:

slint/tools/lsp/ui/components/console-panel.slint

Lines 208 to 226 in 8131481

	property <int> timer-clicked: 0;
	function scroll-to-bottom(){
	lv.viewport-y = -100000px;
	timer-clicked = 0;
	scroll-timer.running = true;
	}
	scroll-timer := Timer {
	running: true;
	interval: 1ms;
	triggered => {
	lv.viewport-y = -100000px;
	if timer-clicked < 1 {
	timer-clicked += 1;
	} else {
	self.running = false;
	}
	}
	}

This needs Slint 1.12. With earlier version it should be fine replacing the -100000px with visible.height - viewport-height or something like that. See also #7421