From 3893ef0e369fc64170c1cc1f37426809d81da31b Mon Sep 17 00:00:00 2001
From: Robbert van der Helm <mail@robbertvanderhelm.nl>
Date: Wed, 9 Feb 2022 18:39:53 +0100
Subject: [PATCH] Use the new baseview mouse modifiers

Which should fix https://github.com/RustAudio/baseview/issues/116 for
the use case of Shift+dragging a slider.
---
 Cargo.toml    |  2 +-
 src/window.rs | 30 ++++++++++++++++++++++++++----
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index fa0952a..3d6bf7f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,6 @@ egui = "0.16"
 gl = { version = "0.14" }
 keyboard-types = { version = "0.6.1", default-features = false }
 # TODO: Move this back to RustAudio/baseview once the PR gets merged
-baseview = { git = "https://github.com/robbert-vdh/baseview.git", branch = "feature/merge-raw-gl-context", features = ["opengl"]  }
+baseview = { git = "https://github.com/robbert-vdh/baseview.git", branch = "feature/mouse-event-modifiers", features = ["opengl"]  }
 raw-window-handle = "0.4"
 copypasta = "0.7.1"
diff --git a/src/window.rs b/src/window.rs
index 6a6fcfa..2ed4d01 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -3,6 +3,7 @@ use baseview::{
     Event, EventStatus, Window, WindowHandle, WindowHandler, WindowOpenOptions, WindowScalePolicy,
 };
 use copypasta::ClipboardProvider;
+use keyboard_types::Modifiers;
 use raw_window_handle::HasRawWindowHandle;
 
 use std::time::Instant;
@@ -306,6 +307,13 @@ where
             )
         }
     }
+
+    /// Update the pressed key modifiers when a mouse event has sent a new set of modifiers.
+    fn update_modifiers(&mut self, modifiers: &Modifiers) {
+        self.raw_input.modifiers.alt = !(*modifiers & Modifiers::ALT).is_empty();
+        self.raw_input.modifiers.shift = !(*modifiers & Modifiers::SHIFT).is_empty();
+        self.raw_input.modifiers.command = !(*modifiers & Modifiers::CONTROL).is_empty();
+    }
 }
 
 impl<State, U> WindowHandler for EguiWindow<State, U>
@@ -365,12 +373,19 @@ where
     fn on_event(&mut self, _window: &mut Window, event: Event) -> EventStatus {
         match &event {
             baseview::Event::Mouse(event) => match event {
-                baseview::MouseEvent::CursorMoved { position } => {
+                baseview::MouseEvent::CursorMoved {
+                    position,
+                    modifiers,
+                } => {
+                    self.update_modifiers(modifiers);
+
                     let pos = pos2(position.x as f32, position.y as f32);
                     self.mouse_pos = Some(pos);
                     self.raw_input.events.push(egui::Event::PointerMoved(pos));
                 }
-                baseview::MouseEvent::ButtonPressed(button) => {
+                baseview::MouseEvent::ButtonPressed { button, modifiers } => {
+                    self.update_modifiers(modifiers);
+
                     if let Some(pos) = self.mouse_pos {
                         if let Some(button) = translate_mouse_button(*button) {
                             self.raw_input.events.push(egui::Event::PointerButton {
@@ -382,7 +397,9 @@ where
                         }
                     }
                 }
-                baseview::MouseEvent::ButtonReleased(button) => {
+                baseview::MouseEvent::ButtonReleased { button, modifiers } => {
+                    self.update_modifiers(modifiers);
+
                     if let Some(pos) = self.mouse_pos {
                         if let Some(button) = translate_mouse_button(*button) {
                             self.raw_input.events.push(egui::Event::PointerButton {
@@ -394,7 +411,12 @@ where
                         }
                     }
                 }
-                baseview::MouseEvent::WheelScrolled(scroll_delta) => {
+                baseview::MouseEvent::WheelScrolled {
+                    delta: scroll_delta,
+                    modifiers,
+                } => {
+                    self.update_modifiers(modifiers);
+
                     let mut delta = match scroll_delta {
                         baseview::ScrollDelta::Lines { x, y } => {
                             let points_per_scroll_line = 50.0; // Scroll speed decided by consensus: https://github.com/emilk/egui/issues/461