From b12a51a0f1346bf5b021bd1bec2ed532b9cfe101 Mon Sep 17 00:00:00 2001
From: Putta Khunchalee <ultimaweapon@outlook.com>
Date: Sat, 21 Dec 2024 22:46:01 +0700
Subject: [PATCH] Implements RuntimeWindow::on_mouse_input (#1196)

---
 .vscode/launch.json          | 24 +-----------------------
 gui/src/rt/mod.rs            | 11 +++++++++++
 gui/src/rt/window.rs         |  8 +++++++-
 gui/src/ui/backend/window.rs | 35 +++++++++++++++++++++++++++++++++--
 4 files changed, 52 insertions(+), 26 deletions(-)

diff --git a/.vscode/launch.json b/.vscode/launch.json
index 83afac719..e6ddbdacc 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -1,29 +1,7 @@
 {
   "configurations": [
     {
-      "name": "Qt",
-      "type": "lldb",
-      "request": "launch",
-      "args": [
-        "--kernel",
-        "${workspaceFolder}/build/obkrnl"
-      ],
-      "cwd": "${workspaceFolder}",
-      "windows": {
-        "program": "${workspaceFolder}/build/gui/Obliteration.exe",
-        "env": {
-          "Path": "${env:Path};${env:CMAKE_PREFIX_PATH}\\bin"
-        }
-      },
-      "linux": {
-        "program": "${workspaceFolder}/build/gui/obliteration"
-      },
-      "osx": {
-        "program": "${workspaceFolder}/build/gui/obliteration.app/Contents/MacOS/obliteration"
-      }
-    },
-    {
-      "name": "Slint",
+      "name": "GUI",
       "type": "lldb",
       "request": "launch",
       "preLaunchTask": "Build",
diff --git a/gui/src/rt/mod.rs b/gui/src/rt/mod.rs
index 176160ddc..a4727a70a 100644
--- a/gui/src/rt/mod.rs
+++ b/gui/src/rt/mod.rs
@@ -228,6 +228,14 @@ impl<T> ApplicationHandler<Event> for Runtime<T> {
                     _ => return,
                 }
             }
+            WindowEvent::MouseInput {
+                device_id: dev,
+                state: st,
+                button: btn,
+            } => match self.dispatch_window(el, id, move |w| w.on_mouse_input(dev, st, btn)) {
+                Some(Err(e)) => RuntimeError::MouseInput(e),
+                _ => return,
+            },
             WindowEvent::ScaleFactorChanged {
                 scale_factor: new,
                 inner_size_writer: sw,
@@ -283,6 +291,9 @@ pub enum RuntimeError {
     #[error("couldn't handle cursor left")]
     CursorLeft(#[source] Box<dyn Error + Send + Sync>),
 
+    #[error("couldn't handle mouse input")]
+    MouseInput(#[source] Box<dyn Error + Send + Sync>),
+
     #[error("couldn't handle scale factor changed")]
     ScaleFactorChanged(#[source] Box<dyn Error + Send + Sync>),
 
diff --git a/gui/src/rt/window.rs b/gui/src/rt/window.rs
index 5eb8606d5..c25dd943c 100644
--- a/gui/src/rt/window.rs
+++ b/gui/src/rt/window.rs
@@ -1,6 +1,6 @@
 use std::error::Error;
 use winit::dpi::{PhysicalPosition, PhysicalSize};
-use winit::event::{DeviceId, InnerSizeWriter};
+use winit::event::{DeviceId, ElementState, InnerSizeWriter, MouseButton};
 
 /// Encapsulates winit window with window-specific logic.
 ///
@@ -14,6 +14,12 @@ pub trait RuntimeWindow {
         pos: PhysicalPosition<f64>,
     ) -> Result<(), Box<dyn Error + Send + Sync>>;
     fn on_cursor_left(&self, dev: DeviceId) -> Result<(), Box<dyn Error + Send + Sync>>;
+    fn on_mouse_input(
+        &self,
+        dev: DeviceId,
+        st: ElementState,
+        btn: MouseButton,
+    ) -> Result<(), Box<dyn Error + Send + Sync>>;
     fn on_scale_factor_changed(
         &self,
         new: f64,
diff --git a/gui/src/ui/backend/window.rs b/gui/src/ui/backend/window.rs
index d3d55dcf5..ac82d0147 100644
--- a/gui/src/ui/backend/window.rs
+++ b/gui/src/ui/backend/window.rs
@@ -2,13 +2,13 @@ use crate::rt::RuntimeWindow;
 use i_slint_core::window::WindowAdapterInternal;
 use i_slint_core::InternalToken;
 use i_slint_renderer_skia::SkiaRenderer;
-use slint::platform::{Renderer, WindowAdapter, WindowEvent, WindowProperties};
+use slint::platform::{PointerEventButton, Renderer, WindowAdapter, WindowEvent, WindowProperties};
 use slint::{LogicalPosition, LogicalSize, PhysicalSize, PlatformError, WindowSize};
 use std::any::Any;
 use std::cell::Cell;
 use std::error::Error;
 use std::rc::Rc;
-use winit::event::{DeviceId, InnerSizeWriter};
+use winit::event::{DeviceId, ElementState, InnerSizeWriter, MouseButton};
 use winit::window::WindowId;
 
 /// Implementation of [`WindowAdapter`].
@@ -17,6 +17,7 @@ pub struct Window {
     slint: slint::Window,
     renderer: SkiaRenderer,
     visible: Cell<Option<bool>>, // Wayland does not support this so we need to emulate it.
+    pointer: Cell<LogicalPosition>,
 }
 
 impl Window {
@@ -30,6 +31,7 @@ impl Window {
             slint,
             renderer,
             visible: Cell::new(None),
+            pointer: Cell::default(),
         }
     }
 
@@ -68,6 +70,7 @@ impl RuntimeWindow for Window {
 
         self.slint
             .dispatch_event(WindowEvent::PointerMoved { position });
+        self.pointer.set(position);
 
         Ok(())
     }
@@ -77,6 +80,34 @@ impl RuntimeWindow for Window {
         Ok(())
     }
 
+    fn on_mouse_input(
+        &self,
+        _: DeviceId,
+        st: ElementState,
+        btn: MouseButton,
+    ) -> Result<(), Box<dyn Error + Send + Sync>> {
+        // Map button.
+        let button = match btn {
+            MouseButton::Left => PointerEventButton::Left,
+            MouseButton::Right => PointerEventButton::Right,
+            MouseButton::Middle => PointerEventButton::Middle,
+            MouseButton::Back => PointerEventButton::Back,
+            MouseButton::Forward => PointerEventButton::Forward,
+            MouseButton::Other(_) => PointerEventButton::Other,
+        };
+
+        // Dispatch to Slint.
+        let position = self.pointer.get();
+        let ev = match st {
+            ElementState::Pressed => WindowEvent::PointerPressed { position, button },
+            ElementState::Released => WindowEvent::PointerReleased { position, button },
+        };
+
+        self.slint.dispatch_event(ev);
+
+        Ok(())
+    }
+
     fn on_scale_factor_changed(
         &self,
         new: f64,