Implement tab change via button

Cargo.toml

@@ -54,6 +54,7 @@ sdl2 = { version = "0.37.0" }
 syn = { version =  "2.0.67", features = ["extra-traits", "full"] }
 quote = "1.0.35"
 proc-macro2 = "1.0.86"
+downcast-rs = "1.2.1"
 
 utilities = { git = "https://gavania.de/hodasemi/utilities.git" }
 vulkan-rs = { git = "https://gavania.de/hodasemi/vulkan_lib.git" }

character_window/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 anyhow = { workspace = true }
 paste = { workspace = true }
 destructure_traitobject = { workspace = true }
+downcast-rs = { workspace = true }
 
 engine = { path = "../engine" }
 rpg_components = { path = "../rpg_components" }

character_window/src/abilities/mod.rs

@@ -56,7 +56,7 @@ impl<A: Ability + 'static> AbilityPage<A> {
 
         // abilities
         let ability_mode = PageContent::new(
-            Content::new(&engine, reference.clone(), {
+            Content::new::<_, Self>(&engine, reference.clone(), {
                 let engine = engine.clone();
                 let hero = hero.clone();
 
@@ -100,7 +100,7 @@ impl<A: Ability + 'static> AbilityPage<A> {
 
         // addons
         let addons_mode = PageContent::<A, _>::new(
-            Content::new(&engine, reference.clone(), {
+            Content::new::<_, Self>(&engine, reference.clone(), {
                 let engine = engine.clone();
                 let hero = hero.clone();
 

character_window/src/content.rs

@@ -32,13 +32,14 @@ pub struct Content<A: Ability + 'static, T: Send + Sync> {
 }
 
 impl<A: Ability + 'static, T: Send + Sync> Content<A, T> {
-    pub fn new<F>(
+    pub fn new<F, P>(
         engine: &Arc<Engine>,
         reference: Weak<CharacterWindow>,
         on_enable: F,
     ) -> Result<Self>
     where
         F: Fn() -> Result<Vec<T>> + Send + Sync + 'static,
+        P: Page,
     {
         let base = GuiSnippet::from_str(
             engine.gui_handler(),
@@ -48,9 +49,38 @@ impl<A: Ability + 'static, T: Send + Sync> Content<A, T> {
         let left: Arc<Button> = base.element("left")?;
         left.set_text("<")?;
         left.set_info_icon(&engine.controller_icon(ControllerButton::LeftTrigger)?)?;
+        left.set_callback({
+            let reference = reference.clone();
+
+            move || {
+                if let Some(window) = reference.upgrade() {
+                    let mut tab = window.tab_mut();
+                    let page = tab.downcast_mut::<P>();
+
+                    page.previous_tab()?;
+                }
+
+                Ok(())
+            }
+        });
+
         let right: Arc<Button> = base.element("right")?;
         right.set_text(">")?;
         right.set_info_icon(&engine.controller_icon(ControllerButton::RightTrigger)?)?;
+        right.set_callback({
+            let reference = reference.clone();
+
+            move || {
+                if let Some(window) = reference.upgrade() {
+                    let mut tab = window.tab_mut();
+                    let page = tab.downcast_mut::<P>();
+
+                    page.next_tab()?;
+                }
+
+                Ok(())
+            }
+        });
 
         Ok(Self {
             reference,

character_window/src/inventory/mod.rs

@@ -58,7 +58,7 @@ impl<A: Ability + 'static> InventoryPage<A> {
 
         // items
         let item_mode = PageContent::<A, _>::new(
-            Content::new(engine, reference.clone(), {
+            Content::new::<_, Self>(engine, reference.clone(), {
                 let engine = engine.clone();
                 let hero = hero.clone();
 
@@ -107,7 +107,7 @@ impl<A: Ability + 'static> InventoryPage<A> {
 
         // jewels
         let jewel_mode = PageContent::<A, _>::new(
-            Content::new(engine, reference.clone(), {
+            Content::new::<_, Self>(engine, reference.clone(), {
                 let engine = engine.clone();
                 let hero = hero.clone();
 
@@ -153,7 +153,7 @@ impl<A: Ability + 'static> InventoryPage<A> {
 
         // maps
         let map_mode = PageContent::<A, _>::new(
-            Content::new(engine, reference.clone(), {
+            Content::new::<_, Self>(engine, reference.clone(), {
                 let engine = engine.clone();
                 let hero: Entity = hero.clone();
 

character_window/src/lib.rs

@@ -6,6 +6,7 @@ mod page_content;
 mod traits;
 
 use anyhow::Result;
+use downcast_rs::{impl_downcast, Downcast};
 use engine::prelude::*;
 use rpg_components::{
     components::{
@@ -18,7 +19,6 @@ use rpg_components::{
 use std::{
     any::Any,
     collections::HashMap,
-    mem::transmute,
     ops::{Deref, DerefMut},
     sync::{
         atomic::{AtomicUsize, Ordering::SeqCst},
@@ -28,7 +28,7 @@ use std::{
 
 use self::{abilities::AbilityPage, character::CharacterPage, inventory::InventoryPage};
 
-trait Page: Any + Send + Sync {
+trait Page: Any + Send + Sync + Downcast {
     fn enable(&mut self) -> Result<Arc<Grid>>;
     fn disable(&mut self) -> Result<()>;
     fn select(&self) -> Result<()>;
@@ -37,6 +37,8 @@ trait Page: Any + Send + Sync {
     fn event(&mut self, button: ControllerButton) -> Result<bool>;
 }
 
+impl_downcast!(Page);
+
 struct Tab<'a> {
     index: usize,
     tabs: RwLockReadGuard<'a, [Box<dyn Page>; 3]>,
@@ -55,6 +57,12 @@ struct TabMut<'a> {
     tabs: RwLockWriteGuard<'a, [Box<dyn Page>; 3]>,
 }
 
+impl<'a> TabMut<'a> {
+    pub fn downcast_mut<T: Page>(&mut self) -> &mut T {
+        self.tabs[self.index].downcast_mut().unwrap()
+    }
+}
+
 impl<'a> Deref for TabMut<'a> {
     type Target = Box<dyn Page>;
 
@@ -75,25 +83,16 @@ pub struct Tabs<'a> {
 
 #[allow(unused)]
 impl<'a> Tabs<'a> {
-    pub fn character(&mut self) -> &'a CharacterPage {
-        Self::downcast_unchecked(&self.tabs[0])
+    pub fn character(&mut self) -> &CharacterPage {
+        self.tabs[0].downcast_ref().unwrap()
     }
 
-    pub fn inventory<A: Ability + 'static>(&mut self) -> &'a InventoryPage<A> {
-        Self::downcast_unchecked(&self.tabs[1])
+    pub fn inventory<A: Ability + 'static>(&mut self) -> &InventoryPage<A> {
+        self.tabs[1].downcast_ref().unwrap()
     }
 
-    pub fn abilities<A: Ability + 'static>(&mut self) -> &'a AbilityPage<A> {
-        Self::downcast_unchecked(&self.tabs[2])
-    }
-
-    fn downcast_unchecked<T: Page>(boxed_ref: &Box<dyn Page>) -> &'a T {
-        unsafe {
-            let ptr_to_ptr: *const *const T =
-                transmute(destructure_traitobject::data(boxed_ref as *const _));
-
-            &**ptr_to_ptr
-        }
+    pub fn abilities<A: Ability + 'static>(&mut self) -> &AbilityPage<A> {
+        self.tabs[2].downcast_ref().unwrap()
     }
 }
 
@@ -103,25 +102,16 @@ pub struct TabsMut<'a> {
 
 #[allow(unused)]
 impl<'a> TabsMut<'a> {
-    pub fn character(&mut self) -> &'a mut CharacterPage {
-        Self::downcast_mut_unchecked(&mut self.tabs[0])
+    pub fn character(&mut self) -> &mut CharacterPage {
+        self.tabs[0].downcast_mut().unwrap()
     }
 
-    pub fn inventory<A: Ability + 'static>(&mut self) -> &'a mut InventoryPage<A> {
-        Self::downcast_mut_unchecked(&mut self.tabs[1])
+    pub fn inventory<A: Ability + 'static>(&mut self) -> &mut InventoryPage<A> {
+        self.tabs[1].downcast_mut().unwrap()
     }
 
-    pub fn abilities<A: Ability + 'static>(&mut self) -> &'a mut AbilityPage<A> {
-        Self::downcast_mut_unchecked(&mut self.tabs[2])
-    }
-
-    fn downcast_mut_unchecked<T: Page>(boxed_ref: &mut Box<dyn Page>) -> &'a mut T {
-        unsafe {
-            let ptr_to_ptr: *mut *mut T =
-                transmute(destructure_traitobject::data(boxed_ref as *mut _));
-
-            &mut **ptr_to_ptr
-        }
+    pub fn abilities<A: Ability + 'static>(&mut self) -> &mut AbilityPage<A> {
+        self.tabs[2].downcast_mut().unwrap()
     }
 }