From adb51dba7ede90643b723799b7018697f28a3dfe Mon Sep 17 00:00:00 2001
From: Jonathan Johnson <jon@khonsulabs.com>
Date: Sun, 7 Jan 2024 15:57:23 -0800
Subject: [PATCH] More user guide work

---
 guide/guide-examples/examples/hello-world.rs  |   2 +-
 .../examples/thread-progress.rs               |  34 +++++++
 guide/src/SUMMARY.md                          |   2 +
 guide/src/about/philosophies.md               |   4 +-
 guide/src/about/reactive.md                   |  93 ++++++++++++++++++
 guide/src/about/widgets.md                    |  38 +++++++
 guide/src/examples/thread_progress.png        | Bin 0 -> 24738 bytes
 guide/src/widgets/utility/space.md            |   5 +-
 src/value.rs                                  |   2 +-
 src/widget.rs                                 |   4 +-
 src/window.rs                                 |   8 +-
 11 files changed, 182 insertions(+), 10 deletions(-)
 create mode 100644 guide/guide-examples/examples/thread-progress.rs
 create mode 100644 guide/src/about/reactive.md
 create mode 100644 guide/src/about/widgets.md
 create mode 100644 guide/src/examples/thread_progress.png

diff --git a/guide/guide-examples/examples/hello-world.rs b/guide/guide-examples/examples/hello-world.rs
index fd91cc0..e9744d5 100644
--- a/guide/guide-examples/examples/hello-world.rs
+++ b/guide/guide-examples/examples/hello-world.rs
@@ -8,7 +8,7 @@ fn main() -> cushy::Result {
 
 #[test]
 fn book() {
-    fn hello_world() -> impl MakeWidget {
+    fn hello_world() -> impl cushy::widget::MakeWidget {
         "Hello, World!"
     }
 
diff --git a/guide/guide-examples/examples/thread-progress.rs b/guide/guide-examples/examples/thread-progress.rs
new file mode 100644
index 0000000..ad27315
--- /dev/null
+++ b/guide/guide-examples/examples/thread-progress.rs
@@ -0,0 +1,34 @@
+use std::time::Duration;
+
+use cushy::value::{Destination, Dynamic, Source};
+use cushy::widget::MakeWidget;
+use cushy::widgets::progress::Progressable;
+use guide_examples::book_example;
+
+fn thread_progress() -> impl MakeWidget {
+    // ANCHOR: example
+    let progress = Dynamic::new(0_u8);
+    std::thread::spawn({
+        let progress = progress.clone();
+        move || {
+            while progress.get() < 10 {
+                std::thread::sleep(Duration::from_millis(100));
+                progress.set(progress.get() + 1);
+            }
+        }
+    });
+
+    progress.progress_bar_to(10)
+    // ANCHOR_END: example
+}
+
+fn main() {
+    book_example!(thread_progress).animated(|recorder| {
+        recorder.wait_for(Duration::from_secs(2)).unwrap();
+    });
+}
+
+#[test]
+fn runs() {
+    main();
+}
diff --git a/guide/src/SUMMARY.md b/guide/src/SUMMARY.md
index c26ca99..630ba06 100644
--- a/guide/src/SUMMARY.md
+++ b/guide/src/SUMMARY.md
@@ -6,6 +6,8 @@
 
 - [About Cushy](./about.md)
   - [Cushy's Philosophies](./about/philosophies.md)
+  - [Everything is a `Widget`](./about/widgets.md)
+  - [Reactive Data Model](./about/reactive.md)
 - [Widgets]()
   - [Layout Widgets](./widgets/layout.md)
     - [Align](./widgets/layout/align.md)
diff --git a/guide/src/about/philosophies.md b/guide/src/about/philosophies.md
index b517b8b..2627e15 100644
--- a/guide/src/about/philosophies.md
+++ b/guide/src/about/philosophies.md
@@ -5,8 +5,8 @@ displayed. Here's the philosophies that drive Cushy's design:
 
 - Cushy retains information between redraws so that many events can be handled
   without redrawing the user interface.
-- Everything is a widget. The "root" of a user interface/window is a widget, and
-  widgets can contain other widgets.
+- [Everything is a widget](./widgets.md). The "root" of a user interface/window
+  is a widget, and widgets can contain other widgets.
 - Composition is powerful and easy to reason about. The built-in widget library
   is aimed at providing a suite of single-purpose widgets that can be composed
   to create more complex user interfaces.
diff --git a/guide/src/about/reactive.md b/guide/src/about/reactive.md
new file mode 100644
index 0000000..5c8ca39
--- /dev/null
+++ b/guide/src/about/reactive.md
@@ -0,0 +1,93 @@
+# Reactive Data Model
+
+Cushy is designed around a reactive data model. In many UI frameworks, setting
+the text of a [`Label`][label] is done by telling the label what it's new text
+is. The Cushy way is to create a `Dynamic<T>` containing the value you want to
+display, and give a copy to the label and keep a copy for your application to
+update as needed.
+
+When a widget uses a `Dynamic<T>`, it informs Cushy that it needs to be either
+redrawn or invalidated when its contents change. In turn, when Cushy detects a
+change, it invalidates what is necessary.
+
+This means that updating a progress bar from a different thread is as simple as
+passing a clone of a `Dynamic<T>` that has been provided to a progress bar:
+
+```rust,no_run,no_playground
+{{#include ../../guide-examples/examples/thread-progress.rs:example}}
+```
+
+The above snippet produces this user interface:
+
+![Threaded Progress Bar Update](../examples/thread_progress.png)
+
+This example just shows one simple way that Cushy's reactive model simplifies
+development. To learn more, let's dive into the data types and traits that power
+everything.
+
+## How widgets interact with data
+
+In Cushy, it's conventional for widgets to accept data using one of these
+traits:
+
+| Trait | Target Type | Purpose |
+|-------|-------------|---------|
+| [`IntoValue<T>`][intovalue] | [`Value<T>`][value] | For possibly constant or dynamic values. Can be either a `T` or a `Dynamic<T>`. |
+| [`IntoDynamic<T>`][intodynamic] | [`Dynamic<T>`][dynamic] | For values that are read from and written to. |
+| [`IntoReadOnly<T>`][intoreadonly] | [`ReadOnly<T>`][readonly] | For values that are read-only. Can be either a `T` or a `DynamicReader<T>`. |
+| [`IntoDynamicReader<T>`][intodynamicreader] | [`DynamicReader<T>`][dynamicreader] | For values that are read-only, but are unexpected to be constant. In general, `IntoValue<T>` should be preferred if a single value makes sense to accept. |
+
+Let's look at an example of how these traits are utilizes.
+[`Label::new()`][label-new] accepts the value it is to display as a
+`ReadOnly<T>` where `T: Display + ...`.
+
+This showcases Cushy's philosophy of embracing the Rust type system. Rather than
+forcing `Label` to receive a `String`, it accepts any type that implements
+`Display`, This allows it to accept a wide variety of types.
+
+Beyond basic values, it can also be given a special type that the `Label` can
+react to when updated: a `Dynamic<T>` or a `DynamicReader<T>`.
+
+## What is a `Dynamic<T>`?
+
+A [`Dynamic<T>`][dynamic] is a reference-counted, threadsafe, async-friendly
+location in memory that can invoke a series of callbacks when its contents
+change. Let's revisit the example from the [intro](../intro.md):
+
+```rust,no_run,no_playground
+{{#include ../../guide-examples/examples/intro.rs:example}}
+```
+
+![Hello Ferris Example](../examples/intro.png)
+
+Both the [`Input`][input] and the [`Label`][label] widgets have been given
+instances of `Dynamic<String>`s, but they are two different dynamics. The text
+input field was given the dynamic we want to be edited. We react to the changes
+through the `name.map_each(...)` callback.
+
+## What is a `DynamicReader<T>`?
+
+A [`DynamicReader<T>`][dynamicreader] provides read-only access to a
+`Dynamic<T>`, and also can:
+
+- [block][block] the current thread until the underlying `Dynamic<T>` is changed.
+- [wait][wait] for a change in an async task.
+- Detect when the underlying `Dynamic<T>` has had all of its instances dropped.
+
+`DynamicReader<T>`s can be created using [`Dynamic::into_reader`][into-reader]/[`Dynamic::create_reader`][create-reader].
+
+[value]: <{{ docs }}/value/enum.Value.html>
+[readonly]: <{{ docs }}/value/enum.ReadOnly.html>
+[dynamic]: <{{ docs }}/value/struct.Dynamic.html>
+[into-reader]: <{{ docs }}/value/struct.Dynamic.html#method.into_reader>
+[create-reader]: <{{ docs }}/value/struct.Dynamic.html#method.create_reader>
+[dynamicreader]: <{{ docs }}/value/struct.DynamicReader.html>
+[block]: <{{ docs }}/value/struct.DynamicReader.html#method.block_until_updated>
+[wait]: <{{ docs }}/value/struct.DynamicReader.html#method.wait_until_updated>
+[intovalue]: <{{ docs }}/value/trait.IntoValue.html>
+[intodynamic]: <{{ docs }}/value/trait.IntoDynamic.html>
+[intoreadonly]: <{{ docs }}/value/trait.IntoReadOnly.html>
+[intodynamicreader]: <{{ docs }}/value/trait.IntoDynamicReader.html>
+[label-new]: <{{ docs }}/widgets/label/struct.Label.html#method.new>
+[label]: <{{ docs }}/widgets/label/struct.Label.html>
+[input]: <{{ docs }}/widgets/input/struct.Input.html>
diff --git a/guide/src/about/widgets.md b/guide/src/about/widgets.md
new file mode 100644
index 0000000..d179b70
--- /dev/null
+++ b/guide/src/about/widgets.md
@@ -0,0 +1,38 @@
+# Everything is a `Widget`
+
+A widget is a rectangular area of a screen that implements the
+[`Widget`][widget] trait. Widgets are the fundamental building block of Cushy.
+
+The `Widget` trait can look daunting, as it defines every possible function a
+`Widget` might need in a graphical user interface. Thankfully, the details of
+how this trait works can be ignored until you're ready to create custom widgets.
+
+Developing a user interface in Cushy is a two-step process: gather the
+information for the interface and present the information in one or more
+widgets.
+
+Cushy makes the process of creating widgets easy through the
+[`MakeWidget`][makewidget] trait. Every `Widget` implementor automatically
+implements `MakeWidget`, but it can also be implemented by any type to make it
+easy to utilize within Cushy. For example, `String` implements `MakeWidget` by
+returning a [`Label`][label]. This approach can also be used to convert complex
+structures into multi-widget components without needing to create any new
+`Widget` implementations.
+
+`MakeWidget` is also responsible for why `"Hello, World".run()` works. The
+[`Run`][run] trait is automatically implemented for all `MakeWidget`
+implementations. The implementation simply creates a [`Window`][window] from the
+widget and runs it:
+
+```rust,no_run,no_playground
+{{#include ../../../src/widget.rs:run}}
+```
+
+So now that we know our goal is to create one or more widgets to represent our
+data, how do we transform our data and application state into widgets?
+
+[widget]: <{{ docs }}/widget/trait.Widget.html>
+[makewidget]: <{{ docs }}/widget/trait.MakeWidget.html>
+[label]: <{{docs}}/widgets/label/struct.Label.html>
+[run]: <{{ docs }}/trait.Run.html>
+[window]: <{{ docs }}/window/struct.Window.html>
diff --git a/guide/src/examples/thread_progress.png b/guide/src/examples/thread_progress.png
new file mode 100644
index 0000000000000000000000000000000000000000..fcb4c34c011a6ca87a1b5ba5460cb9763a06deab
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diff --git a/guide/src/widgets/utility/space.md b/guide/src/widgets/utility/space.md
index 01d908a..47f45ef 100644
--- a/guide/src/widgets/utility/space.md
+++ b/guide/src/widgets/utility/space.md
@@ -1,5 +1,8 @@
 # Space Widget
 
-The [`Space`][space]
+The [`Space`][space] widget is used to fill space. It is not interactive, and
+will always occupy the smallest size it can.
+
+It can render a color or be clear.
 
 [space]: <{{ docs }}/widgets/struct.Space.html>
diff --git a/src/value.rs b/src/value.rs
index acece66..edd22dd 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -2030,7 +2030,7 @@ impl<T> PartialEq<WeakDynamic<T>> for Dynamic<T> {
     }
 }
 
-/// A reader that tracks the last generation accessed through this reader.
+/// A reader of a [`Dynamic<T>`] that tracks the last generation accessed.
 pub struct DynamicReader<T> {
     source: Arc<DynamicData<T>>,
     read_generation: Mutex<Generation>,
diff --git a/src/widget.rs b/src/widget.rs
index d30de58..42e152c 100644
--- a/src/widget.rs
+++ b/src/widget.rs
@@ -455,14 +455,16 @@ pub trait Widget: Send + Debug + 'static {
     }
 }
 
+// ANCHOR: run
 impl<T> Run for T
 where
     T: MakeWidget,
 {
     fn run(self) -> crate::Result {
-        Window::<WidgetInstance>::new(self.make_widget()).run()
+        Window::for_widget(self).run()
     }
 }
+// ANCHOR_END: run
 
 impl<T> Open for T
 where
diff --git a/src/window.rs b/src/window.rs
index 00a1d12..c93d2f2 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -56,8 +56,8 @@ use crate::value::{
     Destination, Dynamic, DynamicReader, Generation, IntoDynamic, IntoValue, Source, Value,
 };
 use crate::widget::{
-    EventHandling, MakeWidget, MountedWidget, OnceCallback, RootBehavior, Widget, WidgetId,
-    WidgetInstance, HANDLED, IGNORED,
+    EventHandling, MakeWidget, MountedWidget, OnceCallback, RootBehavior, WidgetId, WidgetInstance,
+    HANDLED, IGNORED,
 };
 use crate::window::sealed::WindowCommand;
 use crate::{initialize_tracing, ConstraintLimit};
@@ -496,9 +496,9 @@ impl Window<WidgetInstance> {
     /// Returns a new instance using `widget` as its contents.
     pub fn for_widget<W>(widget: W) -> Self
     where
-        W: Widget,
+        W: MakeWidget,
     {
-        Self::new(WidgetInstance::new(widget))
+        Self::new(widget.make_widget())
     }
 
     /// Sets `focused` to be the dynamic updated when this window's focus status