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roomhistory: keep scroll position when adding messeges

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This adjusts the scroll position when more messages are loaded. Also
messages are fetched once the user reaches the edge -2*pageSize.
This commit is contained in:
Julian Sparber 2018-11-08 21:23:18 +01:00
parent 1f1de7ab82
commit 51a75d5a96
1 changed files with 24 additions and 5 deletions
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29
fractal-gtk/src/app/connect/scroll.rs
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@ -1,3 +1,6 @@
use std::cell::RefCell;
use std::rc::Rc;
use gtk;
use gtk::prelude::*;
use gdk::FrameClockExt;
@ -18,11 +21,6 @@ impl App {
.get_object::<gtk::Revealer>("scroll_btn_revealer")
.expect("Can't find scroll_btn_revealer in ui file.");
let op = self.op.clone();
s.connect_edge_overshot(move |_, dir| if dir == gtk::PositionType::Top {
op.lock().unwrap().load_more_messages();
});
/* From clutter-easing.c, based on Robert Penner's
* infamous easing equations, MIT license.
*/
@ -67,13 +65,32 @@ impl App {
let op = self.op.clone();
adj.connect_changed(clone!(s => move |_| {
if op.lock().unwrap().autoscroll {
op.lock().unwrap().autoscroll = true;
scroll_down(&s, false);
}
}));
/* Keep the scroll position when loading more messages */
let op = self.op.clone();
let upper: Rc<RefCell<f64>> = Rc::new(RefCell::new(adj.get_upper()));
adj.connect_property_upper_notify(move |x| {
let new_upper = x.get_upper();
let diff = new_upper - *upper.borrow();
*upper.borrow_mut() = new_upper;
if !op.lock().unwrap().autoscroll {
x.set_value(x.get_value() + diff);
}
});
let op = self.op.clone();
let r = revealer.clone();
adj.connect_value_changed(move |adj| {
/* the page size twice to detect if the user gets close the edge */
if adj.get_value() < adj.get_page_size() * 2.0 {
/* Load more messages once the user is nearly at the end of the history */
op.lock().unwrap().load_more_messages();
}
let bottom = adj.get_upper() - adj.get_page_size();
if adj.get_value() == bottom {
r.set_reveal_child(false);
@ -85,8 +102,10 @@ impl App {
});
}
let op = self.op.clone();
btn.connect_clicked(move |_| {
revealer.set_reveal_child(false);
op.lock().unwrap().autoscroll = true;
scroll_down(&s, true);
});
}