Building out browser example.

- Includes test case to reproduce textfield dealloc bug.

examples/browser/main.rs

@@ -1,14 +1,29 @@
 //! This example showcases setting up a basic application and window, setting up some views to
 //! work with autolayout, and some basic ways to handle colors.
 
+use cacao::notification_center::Dispatcher;
 use cacao::webview::{WebView, WebViewConfig, WebViewDelegate};
 
-use cacao::input::{TextField, TextFieldDelegate};
-
 use cacao::macos::{App, AppDelegate};
-use cacao::macos::toolbar::{Toolbar, ToolbarItem, ItemIdentifier, ToolbarDelegate};
 use cacao::macos::menu::{Menu, MenuItem};
-use cacao::macos::window::{Window, WindowConfig, WindowDelegate};
+use cacao::macos::toolbar::Toolbar;
+use cacao::macos::window::{Window, WindowConfig, WindowDelegate, WindowToolbarStyle};
+
+mod toolbar;
+use toolbar::BrowserToolbar;
+
+#[derive(Debug)]
+pub enum Action {
+    Back,
+    Forwards,
+    Load(String)
+}
+
+impl Action {
+    pub fn dispatch(self) {
+        App::<BasicApp, Self>::dispatch_main(self);
+    }
+}
 
 struct BasicApp {
     window: Window<AppWindow>
@@ -61,33 +76,21 @@ impl AppDelegate for BasicApp {
     }
 }
 
-pub struct URLBar;
+impl Dispatcher for BasicApp {
+    type Message = Action;
 
-impl TextFieldDelegate for URLBar {
+    fn on_ui_message(&self, message: Self::Message) {
-    const NAME: &'static str = "URLBar";
+        let window = self.window.delegate.as_ref().unwrap();
-}
+        let webview = &window.content;
 
-struct BrowserToolbar {
+        match message {
-    url_bar: TextField<URLBar>
+            Action::Back => { webview.go_back(); },
-}
+            Action::Forwards => { webview.go_forward(); },
-
+            Action::Load(url) => { window.load_url(&url); } 
-impl BrowserToolbar {
-    pub fn new() -> Self {
-        BrowserToolbar {
-            url_bar: TextField::with(URLBar)
         }
     }
 }
 
-impl ToolbarDelegate for BrowserToolbar {
-    const NAME: &'static str = "BrowserToolbar";
-
-    fn allowed_item_identifiers(&self) -> Vec<ItemIdentifier> { vec![] }
-    fn default_item_identifiers(&self) -> Vec<ItemIdentifier> { vec![] }
-
-    fn item_for(&self, _identifier: &str) -> &ToolbarItem { std::unreachable!(); }
-}
-
 #[derive(Default)]
 pub struct WebViewInstance;
 
@@ -105,6 +108,11 @@ impl AppWindow {
             content: WebView::with(WebViewConfig::default(), WebViewInstance::default())
         }
     }
+
+    pub fn load_url(&self, url: &str) {
+        self.toolbar.delegate.as_ref().unwrap().set_url(url);
+        self.content.load_url(url);
+    }
 }
 
 impl WindowDelegate for AppWindow {
@@ -112,17 +120,25 @@ impl WindowDelegate for AppWindow {
 
     fn did_load(&mut self, window: Window) {
         window.set_title("Browser Example");
+        window.set_autosave_name("CacaoBrowserExample");
         window.set_minimum_content_size(400., 400.);
 
         window.set_toolbar(&self.toolbar);
         window.set_content_view(&self.content);
 
-        self.content.load_url("https://www.duckduckgo.com/");
+        self.load_url("https://www.duckduckgo.com/");
     }
 }
 
 fn main() {
     App::new("com.test.window", BasicApp {
-        window: Window::with(WindowConfig::default(), AppWindow::new())
+        window: Window::with({
+            let mut config = WindowConfig::default();
+
+            // This flag is necessary for Big Sur to use the correct toolbar style.
+            config.toolbar_style = WindowToolbarStyle::Expanded;
+
+            config
+        }, AppWindow::new())
     }).run();
 }

examples/browser/toolbar.rs

@@ -0,0 +1,105 @@
+
+use cacao::objc::{msg_send, sel, sel_impl};
+
+use cacao::button::Button;
+use cacao::input::{TextField, TextFieldDelegate};
+
+use cacao::macos::toolbar::{Toolbar, ToolbarDisplayMode, ToolbarItem, ItemIdentifier, ToolbarDelegate};
+
+use super::Action;
+
+const BACK_BUTTON: &'static str = "BackButton";
+const FWDS_BUTTON: &'static str = "FwdsButton";
+const URL_BAR: &'static str = "URLBar";
+
+#[derive(Debug)]
+pub struct URLBar;
+
+impl TextFieldDelegate for URLBar {
+    const NAME: &'static str = "URLBar";
+
+    fn text_did_end_editing(&self, value: &str) {
+        Action::Load(value.to_string()).dispatch();
+    }
+}
+
+#[derive(Debug)]
+pub struct BrowserToolbar {
+    back_item: ToolbarItem,
+    forwards_item: ToolbarItem,
+    url_bar: TextField<URLBar>,
+    url_bar_item: ToolbarItem
+}
+
+impl BrowserToolbar {
+    pub fn new() -> Self {
+        let back_button = Button::new("Back");
+        let mut back_item = ToolbarItem::new(BACK_BUTTON);
+        back_item.set_button(back_button);
+        back_item.set_action(|| Action::Back.dispatch());
+
+        let forwards_button = Button::new("Forwards");
+        let mut forwards_item = ToolbarItem::new(FWDS_BUTTON);
+        forwards_item.set_button(forwards_button);
+        forwards_item.set_action(|| Action::Forwards.dispatch());
+
+        let url_bar = TextField::with(URLBar);
+        let url_bar_item = ToolbarItem::new(URL_BAR);
+        
+        // We cheat for now to link these, as there's no API for Toolbar yet 
+        // to support arbitrary view types. The framework is designed to support this kind of
+        // cheating, though: it's not outlandish to need to just manage things yourself when it
+        // comes to Objective-C/AppKit sometimes.
+        //
+        // As long as we keep hold of things here and they all drop together, it's relatively safe.
+        url_bar.objc.with_mut(|obj| unsafe {
+            let _: () = msg_send![&*url_bar_item.objc, setView:&*obj];
+        });
+
+        BrowserToolbar {
+            back_item,
+            forwards_item,
+            url_bar,
+            url_bar_item
+        }
+    }
+
+    pub fn set_url(&self, url: &str) {
+        self.url_bar.set_text(url);
+    }
+
+    fn item_identifiers(&self) -> Vec<ItemIdentifier> {
+        vec![
+            ItemIdentifier::Custom(BACK_BUTTON),
+            ItemIdentifier::Custom(FWDS_BUTTON),
+            ItemIdentifier::Space,
+            ItemIdentifier::Custom(URL_BAR),
+            ItemIdentifier::Space
+        ]
+    }
+}
+
+impl ToolbarDelegate for BrowserToolbar {
+    const NAME: &'static str = "BrowserToolbar";
+
+    fn did_load(&mut self, toolbar: Toolbar) {
+        toolbar.set_display_mode(ToolbarDisplayMode::IconOnly);
+    }
+
+    fn allowed_item_identifiers(&self) -> Vec<ItemIdentifier> {
+        self.item_identifiers()
+    }
+
+    fn default_item_identifiers(&self) -> Vec<ItemIdentifier> {
+        self.item_identifiers()
+    }
+
+    fn item_for(&self, identifier: &str) -> &ToolbarItem {
+        match identifier {
+            BACK_BUTTON => &self.back_item,
+            FWDS_BUTTON => &self.forwards_item,
+            URL_BAR => &self.url_bar_item,
+            _ => { std::unreachable!(); }
+        }
+    }
+}

src/input/macos.rs

@@ -13,7 +13,7 @@ use crate::utils::load;
 /// Called when editing this text field has ended (e.g. user pressed enter).
 extern "C" fn text_did_end_editing<T: TextFieldDelegate>(this: &mut Object, _: Sel, _info: id) {
     let view = load::<T>(this, TEXTFIELD_DELEGATE_PTR);
-    let s = NSString::retain(unsafe { msg_send![this, stringValue] });
+    let s = NSString::from_retained(unsafe { msg_send![this, stringValue] });
     view.text_did_end_editing(s.to_str());
 }
 

src/webview/mod.rs

@@ -242,6 +242,20 @@ impl<T> WebView<T> {
             let _: () = msg_send![&*obj, loadRequest:request];
         });
     }
+
+    /// Go back in history, if possible.
+    pub fn go_back(&self) {
+        self.objc.with_mut(|obj| unsafe {
+            let _: () = msg_send![&*obj, goBack];
+        });
+    }
+
+    /// Go forward in history, if possible.
+    pub fn go_forward(&self) {
+        self.objc.with_mut(|obj| unsafe {
+            let _: () = msg_send![&*obj, goForward];
+        });
+    }
 }
 
 impl<T> Layout for WebView<T> {