desktop: Add OpenDialog event for opening dialogs

This event replaces AskToOpenUrl and is more generic, because
it may open any dialog (specified as an argument).

desktop/src/app.rs

@@ -500,8 +500,8 @@ impl App {
                         .create_movie(&mut self.player, *options, url);
                 }
 
-                winit::event::Event::UserEvent(RuffleEvent::AskToOpenUrl(url)) => {
-                    self.gui.borrow_mut().show_open_url_dialog(url);
+                winit::event::Event::UserEvent(RuffleEvent::OpenDialog(descriptor)) => {
+                    self.gui.borrow_mut().open_dialog(descriptor);
                 }
 
                 winit::event::Event::UserEvent(RuffleEvent::CloseFile) => {

desktop/src/backends/navigator.rs

@@ -9,6 +9,7 @@ use url::Url;
 use winit::event_loop::EventLoopProxy;
 
 use crate::custom_event::RuffleEvent;
+use crate::gui::DialogDescriptor;
 use crate::util::open_url;
 
 #[derive(Clone)]
@@ -36,7 +37,7 @@ impl NavigatorInterface for DesktopNavigatorInterface {
             .event_loop
             .lock()
             .expect("Non-poisoned event loop")
-            .send_event(RuffleEvent::AskToOpenUrl(url));
+            .send_event(RuffleEvent::OpenDialog(DialogDescriptor::OpenUrl(url)));
     }
 
     fn open_file(&self, path: &Path) -> io::Result<File> {

desktop/src/custom_event.rs

@@ -1,6 +1,6 @@
 //! Custom event type for desktop ruffle
 
-use crate::player::LaunchOptions;
+use crate::{gui::DialogDescriptor, player::LaunchOptions};
 
 /// User-defined events.
 pub enum RuffleEvent {
@@ -31,6 +31,6 @@ pub enum RuffleEvent {
     /// The user selected an item in the right-click context menu.
     ContextMenuItemClicked(usize),
 
-    /// The movie wants to open a URL link.
-    AskToOpenUrl(url::Url),
+    /// The movie wants to open a dialog.
+    OpenDialog(DialogDescriptor),
 }

desktop/src/gui.rs

@@ -8,6 +8,7 @@ mod theme;
 mod widgets;
 
 pub use controller::GuiController;
+pub use dialogs::DialogDescriptor;
 pub use movie::MovieView;
 pub use picker::FilePicker;
 use std::borrow::Cow;

desktop/src/gui/controller.rs

@@ -23,7 +23,7 @@ use winit::event_loop::EventLoop;
 use winit::keyboard::{Key, NamedKey};
 use winit::window::{Theme, Window};
 
-use super::FilePicker;
+use super::{DialogDescriptor, FilePicker};
 
 /// Integration layer connecting wgpu+winit to egui.
 pub struct GuiController {
@@ -397,8 +397,8 @@ impl GuiController {
         self.gui.dialogs.open_file_advanced()
     }
 
-    pub fn show_open_url_dialog(&mut self, url: Url) {
-        self.gui.dialogs.open_open_url(url);
+    pub fn open_dialog(&mut self, dialog_event: DialogDescriptor) {
+        self.gui.dialogs.open_dialog(dialog_event);
     }
 }
 

desktop/src/gui/dialogs.rs

@@ -41,6 +41,10 @@ pub struct Dialogs {
     preferences: GlobalPreferences,
 }
 
+pub enum DialogDescriptor {
+    OpenUrl(url::Url),
+}
+
 impl Dialogs {
     pub fn new(
         preferences: GlobalPreferences,
@@ -121,8 +125,12 @@ impl Dialogs {
         self.is_about_visible = true;
     }
 
-    pub fn open_open_url(&mut self, url: Url) {
-        self.open_url_dialog = Some(OpenUrlDialog::new(url));
+    pub fn open_dialog(&mut self, event: DialogDescriptor) {
+        match event {
+            DialogDescriptor::OpenUrl(url) => {
+                self.open_url_dialog = Some(OpenUrlDialog::new(url));
+            }
+        }
     }
 
     pub fn show(