Add a widget that controls the SC editor mode

plugins/spectral_compressor/src/editor.rs

@@ -23,6 +23,8 @@ use std::sync::Arc;
 
 use crate::{SpectralCompressor, SpectralCompressorParams};
 
+mod mode_button;
+
 /// The entire GUI's width, in logical pixels.
 const EXPANDED_GUI_WIDTH: u32 = 1360;
 /// The width of the GUI's main part containing the controls.
@@ -44,8 +46,8 @@ pub enum EditorMode {
     #[serde(rename = "collapsed")]
     Collapsed,
     #[default]
-    #[serde(rename = "visualizer-shown")]
-    Visualizer,
+    #[serde(rename = "visualizer-visible")]
+    VisualizerVisible,
 }
 
 #[derive(Lens)]

plugins/spectral_compressor/src/editor/mode_button.rs

@@ -0,0 +1,86 @@
+// Spectral Compressor: an FFT based compressor
+// Copyright (C) 2021-2023 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use std::sync::Arc;
+
+use crossbeam::atomic::AtomicCell;
+use nih_plug_vizia::vizia::prelude::*;
+
+use super::EditorMode;
+
+/// A custom toggleable button that allows changing between the collapsed and expanded editor modes.
+pub struct EditorModeButton {
+    mode: Arc<AtomicCell<EditorMode>>,
+}
+
+impl EditorModeButton {
+    /// Creates a new button bound to the editor mode setting.
+    pub fn new<L, T>(cx: &mut Context, lens: L, label: impl Res<T>) -> Handle<Self>
+    where
+        L: Lens<Target = Arc<AtomicCell<EditorMode>>>,
+        T: ToString,
+    {
+        Self { mode: lens.get(cx) }
+            .build(cx, move |cx| {
+                Label::new(cx, label);
+            })
+            .checked(lens.map(|v| v.load() == EditorMode::VisualizerVisible))
+            // We'll pretend this is a param-button, so this class is used for assigning a unique
+            // color
+            .class("editor-mode")
+    }
+}
+
+impl View for EditorModeButton {
+    fn element(&self) -> Option<&'static str> {
+        // Reuse the styling from param-button
+        Some("param-button")
+    }
+
+    fn event(&mut self, cx: &mut EventContext, event: &mut Event) {
+        event.map(|window_event, meta| match window_event {
+            WindowEvent::MouseDown(MouseButton::Left)
+            | WindowEvent::MouseDoubleClick(MouseButton::Left)
+            | WindowEvent::MouseTripleClick(MouseButton::Left) => {
+                // TODO: Somehow change the way window sizes work in NIH-plug to be callback based.
+                //       Now this can technically go out of sync if the GUI is closed between the
+                //       mode changing and the resize actually getting processed
+                let current_mode = self.mode.load();
+                let new_mode = match current_mode {
+                    EditorMode::Collapsed => EditorMode::VisualizerVisible,
+                    EditorMode::VisualizerVisible => EditorMode::Collapsed,
+                };
+
+                match new_mode {
+                    EditorMode::Collapsed => cx.set_window_size(WindowSize {
+                        width: super::COLLAPSED_GUI_WIDTH,
+                        height: super::GUI_HEIGHT,
+                    }),
+                    EditorMode::VisualizerVisible => cx.set_window_size(WindowSize {
+                        width: super::EXPANDED_GUI_WIDTH,
+                        height: super::GUI_HEIGHT,
+                    }),
+                }
+
+                self.mode.store(new_mode);
+                meta.consume();
+            }
+            // Mouse scrolling is intentionally not implemented here since it could be very easy to
+            // do that by accident and that would cause the window to jump all over the place
+            _ => {}
+        });
+    }
+}