Add vim-like page scrolling

* feat: added match fallback for handle_command SelectViewExt

* feat: HalfPage and FullPage MoveAmount variants

* feat: Display for MoveAmount variants

* feat: fallback for MoveAmount variants in TabView

* feat: ListView FullPage/HalfPage MoveAmount

* feat: default keybinds for page scrolling

* feat: HalfPage/FullPage MoveAmount for HelpView

* feat: removed new defaul keybinds for pagescroll

* style: "upwards" -> "halfpageup" etc.

* feat: toml parse "move pageup" / "move halfpageup"

* chore: cargo fmt

* feat: simplified page scroll command interface

* docs: added `move` to readme

* feat: replace FullPage and HalfPage with Float variant

* fix: remove stray variant

* dosc: update move command

* chore: fmt

* feat: implement MoveAmount::Float for selectview

* chore: fmt

src/ui/help.rs

@@ -70,6 +70,11 @@ impl ViewExt for HelpView {
                             MoveAmount::Extreme => {
                                 self.view.scroll_to_top();
                             }
+                            MoveAmount::Float(scale) => {
+                                let amount = (viewport.height() as f32) * scale;
+                                scroller
+                                    .scroll_to_y(viewport.top().saturating_sub(amount as usize));
+                            }
                             MoveAmount::Integer(amount) => scroller
                                 .scroll_to_y(viewport.top().saturating_sub(*amount as usize)),
                         };
@@ -80,6 +85,11 @@ impl ViewExt for HelpView {
                             MoveAmount::Extreme => {
                                 self.view.scroll_to_bottom();
                             }
+                            MoveAmount::Float(scale) => {
+                                let amount = (viewport.height() as f32) * scale;
+                                scroller
+                                    .scroll_to_y(viewport.bottom().saturating_add(amount as usize));
+                            }
                             MoveAmount::Integer(amount) => scroller
                                 .scroll_to_y(viewport.bottom().saturating_add(*amount as usize)),
                         };

src/ui/listview.rs

@@ -542,6 +542,10 @@ impl<I: ListItem + Clone> ViewExt for ListView<I> {
                         if self.selected > 0 {
                             match amount {
                                 MoveAmount::Extreme => self.move_focus_to(0),
+                                MoveAmount::Float(scale) => {
+                                    let amount = (self.last_size.y as f32) * scale;
+                                    self.move_focus(-(amount as i32))
+                                }
                                 MoveAmount::Integer(amount) => self.move_focus(-(*amount)),
                             }
                         }
@@ -551,6 +555,10 @@ impl<I: ListItem + Clone> ViewExt for ListView<I> {
                         if self.selected < last_idx {
                             match amount {
                                 MoveAmount::Extreme => self.move_focus_to(last_idx),
+                                MoveAmount::Float(scale) => {
+                                    let amount = (self.last_size.y as f32) * scale;
+                                    self.move_focus(amount as i32)
+                                }
                                 MoveAmount::Integer(amount) => self.move_focus(*amount),
                             }
                         }

src/ui/tabview.rs

@@ -144,6 +144,7 @@ impl ViewExt for TabView {
                     match amount {
                         MoveAmount::Extreme => self.move_focus_to(0),
                         MoveAmount::Integer(amount) => self.move_focus(-(*amount)),
+                        _ => (),
                     }
                     return Ok(CommandResult::Consumed(None));
                 }
@@ -151,6 +152,7 @@ impl ViewExt for TabView {
                     match amount {
                         MoveAmount::Extreme => self.move_focus_to(last_idx),
                         MoveAmount::Integer(amount) => self.move_focus(*amount),
+                        _ => (),
                     }
                     return Ok(CommandResult::Consumed(None));
                 }