Set up screen via transitions from state to state

cyberpunk-slideshow/Cargo.toml

@@ -6,10 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-cairo-rs    = "0.20.1"
+cairo-rs    = "0.18"
 cyberpunk   = { path = "../cyberpunk" }
-gio         = "0.20.4"
-glib        = "0.20.4"
+gio         = "0.18"
+glib        = "0.18"
 gtk         = { version = "0.7", package = "gtk4" }
 serde       = { version = "1.0.210", features = ["derive"] }
 serde_yml   = "0.0.12"

cyberpunk-slideshow/script.yml

@@ -1,20 +1,11 @@
 - text: The distinguishing thing about magic is that it includes some kind of personal element. The person who is performing the magic is relevant to the magic. -- Ted Chang, Marie Brennan
   position: top
-  transition_in: !Fade
-      duration:
-        secs: 5
-        nanos: 0
+  transition: !Fade
 - text: Any sufficiently advanced technology is indistinguishable from magic. -- Arthur C. Clark.
   position: middle
-  transition_in: !Fade
-      duration:
-        secs: 5
-        nanos: 0
+  transition: !Fade
 
 - text: Electricity is the closest we get to Magic in this world.
   position: middle
-  transition_in: !Fade
-      duration:
-        secs: 5
-        nanos: 0
+  transition: !Fade
 

cyberpunk-slideshow/src/main.rs

@@ -1,42 +1,47 @@
-use std::{fs::File, io::Read, path::Path, rc::Rc, time::Duration};
+use std::{cell::RefCell, fs::File, io::Read, ops::Index, path::Path, rc::Rc, time::Duration};
 
 use cyberpunk::{AsymLine, AsymLineCutout, GlowPen, Pen, Text};
-use glib::Object;
-use gtk::{glib, prelude::*, subclass::prelude::*};
+use glib::{GString, Object};
+use gtk::{
+    glib::{self, Propagation},
+    prelude::*,
+    subclass::prelude::*,
+    EventControllerKey,
+};
 use serde::{Deserialize, Serialize};
 
-#[derive(Serialize, Deserialize, Debug)]
+const PURPLE: (f64, f64, f64) = (0.7, 0., 1.);
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename_all = "lowercase")]
-enum TextArea {
+enum Position {
     Top,
     Middle,
     Bottom,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-struct Fade {
-    duration: Duration,
+#[derive(Serialize, Deserialize, Debug, Clone)]
+enum TransitionName {
+    Fade,
+    CrossFade,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-enum AnimationIn {
+struct Fade(Step);
+
+enum Transition {
     Fade(Fade),
+    CrossFade(Step, Step),
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-enum AnimationOut {
-    Fade(Fade),
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-struct ScriptElement {
+#[derive(Serialize, Deserialize, Debug, Clone)]
+struct Step {
     text: String,
-    position: TextArea,
-    transition_in: AnimationIn,
+    position: Position,
+    transition: TransitionName,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-struct Script(Vec<ScriptElement>);
+#[derive(Serialize, Deserialize, Debug, Clone)]
+struct Script(Vec<Step>);
 
 impl Script {
     fn from_file(path: &Path) -> Result<Script, serde_yml::Error> {
@@ -47,13 +52,106 @@ impl Script {
         Ok(Self(script))
     }
 
-    fn iter<'a>(&'a self) -> impl Iterator<Item = &'a ScriptElement> {
+    fn iter<'a>(&'a self) -> impl Iterator<Item = &'a Step> {
         self.0.iter()
     }
+
+    fn len(&self) -> usize {
+        self.0.len()
+    }
+}
+
+impl Default for Script {
+    fn default() -> Self {
+        Self(vec![])
+    }
+}
+
+impl Index<usize> for Script {
+    type Output = Step;
+
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.0[index]
+    }
+}
+
+#[derive(Debug)]
+pub struct CyberScreenState {
+    script: Script,
+    idx: Option<usize>,
+    top: Option<Step>,
+    middle: Option<Step>,
+    bottom: Option<Step>,
+}
+
+impl Default for CyberScreenState {
+    fn default() -> Self {
+        Self {
+            script: Script(vec![]),
+            idx: None,
+            top: None,
+            middle: None,
+            bottom: None,
+        }
+    }
+}
+
+impl CyberScreenState {
+    fn new(script: Script) -> CyberScreenState {
+        let mut s = CyberScreenState::default();
+        s.script = script;
+        s
+    }
+
+    fn next_page(&mut self) -> Transition {
+        let idx = match self.idx {
+            None => 0,
+            Some(idx) => if idx < self.script.len() {
+                idx + 1
+            } else {
+                idx
+            }
+        };
+        self.idx = Some(idx);
+        let step = self.script[idx].clone();
+
+        match step.position {
+            Position::Top => {
+                let transition = if let Some(old_step) = self.top.take() {
+                    Transition::CrossFade(old_step, step.clone())
+                } else {
+                    Transition::Fade(Fade(step.clone()))
+                };
+                self.top = Some(step);
+                transition
+            }
+            Position::Middle => {
+                let transition = if let Some(old_step) = self.middle.take() {
+                    Transition::CrossFade(old_step, step.clone())
+                } else {
+                    Transition::Fade(Fade(step.clone()))
+                };
+                self.middle = Some(step);
+                transition
+            }
+            Position::Bottom => {
+                let transition = if let Some(old_step) = self.bottom.take() {
+                    Transition::CrossFade(old_step, step.clone())
+                } else {
+                    Transition::Fade(Fade(step.clone()))
+                };
+                self.bottom = Some(step);
+                transition
+            }
+        }
+    }
 }
 
 #[derive(Default)]
-pub struct CyberScreenPrivate {}
+pub struct CyberScreenPrivate {
+    state: Rc<RefCell<CyberScreenState>>,
+    transition_queue: Rc<RefCell<Vec<Transition>>>,
+}
 
 #[glib::object_subclass]
 impl ObjectSubclass for CyberScreenPrivate {
@@ -66,74 +164,89 @@ impl ObjectImpl for CyberScreenPrivate {}
 impl WidgetImpl for CyberScreenPrivate {}
 impl DrawingAreaImpl for CyberScreenPrivate {}
 
+impl CyberScreenPrivate {
+    fn set_script(&self, script: Script) {
+        *self.state.borrow_mut() = CyberScreenState::new(script);
+    }
+
+    fn next_page(&self) {
+        let transition = self.state.borrow_mut().next_page();
+        self.transition_queue.borrow_mut().push(transition);
+    }
+}
+
 glib::wrapper! {
     pub struct CyberScreen(ObjectSubclass<CyberScreenPrivate>) @extends gtk::DrawingArea, gtk::Widget;
 }
 
 impl CyberScreen {
-    pub fn new() -> Self {
+    pub fn new(script: Script) -> Self {
         let s: Self = Object::builder().build();
+        s.imp().set_script(script);
 
         s.set_draw_func({
+            let s = s.clone();
             move |_, context, width, height| {
                 let _ = context.set_source_rgb(0., 0., 0.);
                 let _ = context.paint();
 
                 let pen = GlowPen::new(width, height, 2., 8., (0.7, 0., 1.));
-
-                AsymLine {
-                    orientation: gtk::Orientation::Horizontal,
-                    start_x: 50.,
-                    start_y: height as f64 / 2.,
-                    start_length: 75.,
-                    height: 50.,
-                    end_length: 75.,
-                    invert: false,
+                /*
+                for i in 0..6 {
+                    pen.move_to(0., height as f64 * i as f64 / 5.);
+                    pen.line_to(width as f64, height as f64 * i as f64 / 5.);
                 }
-                .draw(&pen);
                 pen.stroke();
+                */
+
 
-                AsymLineCutout {
-                    orientation: gtk::Orientation::Horizontal,
-                    start_x: 50.,
-                    start_y: height as f64 / 4. * 3.,
-                    start_length: 75.,
-                    cutout_length: 15.,
-                    end_length: 75.,
-                    height: 15.,
-                    invert: true,
-                }.draw(&pen);
-                pen.stroke();
 
                 let tracery = pen.finish();
                 let _ = context.set_source(tracery);
                 let _ = context.paint();
 
-                let text = Text::new("Test text".to_owned(), &context, 64.);
-                let text_extents = text.extents();
-                context.move_to(20., text_extents.height() + 40.);
-                context.set_source_rgb(0.7, 0., 1.);
-                text.draw();
+                for transition in s.imp().transition_queue.borrow().iter() {
+                    if let Some(ref text) = s.imp().state.borrow().top {
+                        let text_display = Text::new(text.text.clone(), context, 32.);
+                        let y = height as f64 * 1. / 5. + text_display.extents().height();
+
+                        context.move_to(20., y);
+                        let _ = context.set_source_rgb(PURPLE.0, PURPLE.1, PURPLE.2);
+                        text_display.draw();
+                    }
+
+                    if let Some(ref text) = s.imp().state.borrow().middle {
+                        let text_display = Text::new(text.text.clone(), context, 32.);
+                        let y = height as f64 * 2. / 5. + text_display.extents().height();
+
+                        context.move_to(20., y);
+                        let _ = context.set_source_rgb(PURPLE.0, PURPLE.1, PURPLE.2);
+                        text_display.draw();
+                    }
+
+                    if let Some(ref text) = s.imp().state.borrow().bottom {
+                        let text_display = Text::new(text.text.clone(), context, 32.);
+                        let y = height as f64 * 3. / 5. + text_display.extents().height();
+
+                        context.move_to(20., y);
+                        let _ = context.set_source_rgb(PURPLE.0, PURPLE.1, PURPLE.2);
+                        text_display.draw();
+                    }
+                }
             }
         });
 
         s
     }
+
+    fn next_page(&self) {
+        println!("next page");
+        self.imp().next_page();
+        self.queue_draw();
+    }
 }
 
 fn main() {
-    /*
-    let script: Script = Script(vec![ScriptElement {
-        text: "abcdefg".to_owned(),
-        position: TextArea::Top,
-        transition_in: AnimationIn::Fade(Fade {
-            duration: Duration::from_secs(10),
-        }),
-    }]);
-
-    println!("{}", serde_yml::to_string(&script).unwrap());
-    */
-
     let script = Script::from_file(Path::new("./script.yml")).unwrap();
     for element in script.iter() {
         println!("{:?}", element);
@@ -143,11 +256,22 @@ fn main() {
         .application_id("com.luminescent-dreams.cyberpunk-slideshow")
         .build();
 
-    app.connect_activate(|app| {
-        let window = gtk::ApplicationWindow::new(app);
-        window.present();
+    app.connect_activate(move |app| {
+        let screen = CyberScreen::new(script.clone());
 
-        let screen = CyberScreen::new();
+        let events = EventControllerKey::new();
+
+        events.connect_key_released({
+            let screen = screen.clone();
+            move |_, key, _, _| {
+                if key.name() == Some(GString::from("Right")) {
+                    screen.next_page();
+                }
+            }
+        });
+
+        let window = gtk::ApplicationWindow::new(app);
+        window.add_controller(events);
 
         window.set_child(Some(&screen));
         window.set_width_request(800);

cyberpunk/src/lib.rs

@@ -1,14 +1,7 @@
 use cairo::{
-    Context, FontSlant, FontWeight, Format, ImageSurface, LineCap, LinearGradient, Pattern,
+    Context, FontSlant, FontWeight, Format, ImageSurface, LineCap, Pattern,
     TextExtents,
 };
-use gtk::{prelude::*, subclass::prelude::*, EventControllerKey};
-use std::{
-    cell::RefCell,
-    rc::Rc,
-    sync::{Arc, RwLock},
-    time::{Duration, Instant},
-};
 
 pub struct AsymLineCutout {
     pub orientation: gtk::Orientation,