mouse forward back support on windows

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/models/input_model.dart

@@ -466,15 +466,21 @@ class InputModel {
     evt['y'] = '${y.round()}';
     var buttons = '';
     switch (evt['buttons']) {
-      case 1:
+      case kPrimaryMouseButton:
         buttons = 'left';
         break;
-      case 2:
+      case kSecondaryMouseButton:
         buttons = 'right';
         break;
-      case 4:
+      case kMiddleMouseButton:
         buttons = 'wheel';
         break;
+      case kBackMouseButton:
+        buttons = 'back';
+        break;
+      case kForwardMouseButton:
+        buttons = 'forward';
+        break;
     }
     evt['buttons'] = buttons;
     bind.sessionSendMouse(id: id, msg: json.encode(evt));

libs/enigo/src/lib.rs

@@ -104,6 +104,10 @@ pub enum MouseButton {
     Middle,
     /// Right mouse button
     Right,
+    /// Back mouse button
+    Back,
+    /// Forward mouse button
+    Forward,
 
     /// Scroll up button
     ScrollUp,

libs/enigo/src/win/win_impl.rs

@@ -134,9 +134,15 @@ impl MouseControllable for Enigo {
                 MouseButton::Left => MOUSEEVENTF_LEFTDOWN,
                 MouseButton::Middle => MOUSEEVENTF_MIDDLEDOWN,
                 MouseButton::Right => MOUSEEVENTF_RIGHTDOWN,
+                MouseButton::Back => MOUSEEVENTF_XDOWN,
+                MouseButton::Forward => MOUSEEVENTF_XDOWN,
                 _ => unimplemented!(),
             },
-            0,
+            match button {
+                MouseButton::Back => XBUTTON1 as _,
+                MouseButton::Forward => XBUTTON2 as _,
+                _ => 0, 
+            },
             0,
             0,
         );
@@ -155,9 +161,15 @@ impl MouseControllable for Enigo {
                 MouseButton::Left => MOUSEEVENTF_LEFTUP,
                 MouseButton::Middle => MOUSEEVENTF_MIDDLEUP,
                 MouseButton::Right => MOUSEEVENTF_RIGHTUP,
+                MouseButton::Back => MOUSEEVENTF_XUP,
+                MouseButton::Forward => MOUSEEVENTF_XUP,
                 _ => unimplemented!(),
             },
-            0,
+            match button {
+                MouseButton::Back => XBUTTON1 as _,
+                MouseButton::Forward => XBUTTON2 as _,
+                _ => 0, 
+            },
             0,
             0,
         );

src/flutter_ffi.rs

@@ -885,9 +885,11 @@ pub fn session_send_mouse(id: String, msg: String) {
         }
         if let Some(buttons) = m.get("buttons") {
             mask |= match buttons.as_str() {
-                "left" => 1,
+                "left" => 0x01,
-                "right" => 2,
+                "right" => 0x02,
-                "wheel" => 4,
+                "wheel" => 0x04,
+                "back" => 0x08,
+                "forward" => 0x10,
                 _ => 0,
             } << 3;
         }

src/server/input_service.rs

@@ -556,27 +556,39 @@ pub fn handle_mouse_(evt: &MouseEvent) {
             en.mouse_move_to(evt.x, evt.y);
         }
         1 => match buttons {
-            1 => {
+            0x01 => {
                 allow_err!(en.mouse_down(MouseButton::Left));
             }
-            2 => {
+            0x02 => {
                 allow_err!(en.mouse_down(MouseButton::Right));
             }
-            4 => {
+            0x04 => {
                 allow_err!(en.mouse_down(MouseButton::Middle));
             }
+            0x08 => {
+                allow_err!(en.mouse_down(MouseButton::Back));
+            }
+            0x10 => {
+                allow_err!(en.mouse_down(MouseButton::Forward));
+            }
             _ => {}
         },
         2 => match buttons {
-            1 => {
+            0x01 => {
                 en.mouse_up(MouseButton::Left);
             }
-            2 => {
+            0x02 => {
                 en.mouse_up(MouseButton::Right);
             }
-            4 => {
+            0x04 => {
                 en.mouse_up(MouseButton::Middle);
             }
+            0x08 => {
+                en.mouse_up(MouseButton::Back);
+            }
+            0x10 => {
+                en.mouse_up(MouseButton::Forward);
+            }
             _ => {}
         },
         3 | 4 => {