feat: add middle click event to tray

docs/api/tray.md

@@ -111,6 +111,15 @@ Returns:
 
 Emitted when the tray icon is double clicked.
 
+#### Event: 'middle-click' _Windows_
+
+Returns:
+
+* `event` [KeyboardEvent](structures/keyboard-event.md)
+* `bounds` [Rectangle](structures/rectangle.md) - The bounds of tray icon.
+
+Emitted when the tray icon is middle clicked.
+
 #### Event: 'balloon-show' _Windows_
 
 Emitted when the tray balloon shows.

shell/browser/api/electron_api_tray.cc

@@ -102,6 +102,12 @@ void Tray::OnRightClicked(const gfx::Rect& bounds, int modifiers) {
   EmitWithoutEvent("right-click", CreateEventFromFlags(modifiers), bounds);
 }
 
+void Tray::OnMiddleClicked(const gfx::Rect& bounds, int modifiers) {
+  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
+  v8::HandleScope scope(isolate);
+  EmitWithoutEvent("middle-click", CreateEventFromFlags(modifiers), bounds);
+}
+
 void Tray::OnBalloonShow() {
   Emit("balloon-show");
 }

shell/browser/api/electron_api_tray.h

@@ -69,6 +69,7 @@ class Tray : public gin::Wrappable<Tray>,
                  int modifiers) override;
   void OnDoubleClicked(const gfx::Rect& bounds, int modifiers) override;
   void OnRightClicked(const gfx::Rect& bounds, int modifiers) override;
+  void OnMiddleClicked(const gfx::Rect& bounds, int modifiers) override;
   void OnBalloonShow() override;
   void OnBalloonClicked() override;
   void OnBalloonClosed() override;

shell/browser/ui/tray_icon.cc

@@ -41,6 +41,11 @@ void TrayIcon::NotifyDoubleClicked(const gfx::Rect& bounds, int modifiers) {
     observer.OnDoubleClicked(bounds, modifiers);
 }
 
+void TrayIcon::NotifyMiddleClicked(const gfx::Rect& bounds, int modifiers) {
+  for (TrayIconObserver& observer : observers_)
+    observer.OnMiddleClicked(bounds, modifiers);
+}
+
 void TrayIcon::NotifyBalloonShow() {
   for (TrayIconObserver& observer : observers_)
     observer.OnBalloonShow();

shell/browser/ui/tray_icon.h

@@ -106,6 +106,7 @@ class TrayIcon {
                      const gfx::Point& location = gfx::Point(),
                      int modifiers = 0);
   void NotifyDoubleClicked(const gfx::Rect& = gfx::Rect(), int modifiers = 0);
+  void NotifyMiddleClicked(const gfx::Rect& = gfx::Rect(), int modifiers = 0);
   void NotifyBalloonShow();
   void NotifyBalloonClicked();
   void NotifyBalloonClosed();

shell/browser/ui/tray_icon_observer.h

@@ -23,6 +23,7 @@ class TrayIconObserver : public base::CheckedObserver {
                          const gfx::Point& location,
                          int modifiers) {}
   virtual void OnDoubleClicked(const gfx::Rect& bounds, int modifiers) {}
+  virtual void OnMiddleClicked(const gfx::Rect& bounds, int modifiers) {}
   virtual void OnBalloonShow() {}
   virtual void OnBalloonClicked() {}
   virtual void OnBalloonClosed() {}

shell/browser/ui/win/notify_icon.cc

@@ -73,7 +73,8 @@ NotifyIcon::~NotifyIcon() {
 
 void NotifyIcon::HandleClickEvent(int modifiers,
                                   bool left_mouse_click,
-                                  bool double_button_click) {
+                                  bool double_button_click,
+                                  bool middle_button_click) {
   gfx::Rect bounds = GetBounds();
 
   if (left_mouse_click) {
@@ -84,6 +85,8 @@ void NotifyIcon::HandleClickEvent(int modifiers,
                     display::Screen::GetScreen()->GetCursorScreenPoint(),
                     modifiers);
     return;
+  } else if (middle_button_click) {  // single middle click
+    NotifyMiddleClicked(bounds, modifiers);
   } else if (!double_button_click) {  // single right click
     if (menu_model_)
       PopUpContextMenu(gfx::Point(), menu_model_->GetWeakPtr());

shell/browser/ui/win/notify_icon.h

@@ -45,7 +45,8 @@ class NotifyIcon : public TrayIcon {
   // otherwise displays the context menu if there is one.
   void HandleClickEvent(int modifiers,
                         bool left_button_click,
-                        bool double_button_click);
+                        bool double_button_click,
+                        bool middle_button_click);
 
   // Handles a mouse move event from the user.
   void HandleMouseMoveEvent(int modifiers);

shell/browser/ui/win/notify_icon_host.cc

@@ -189,8 +189,10 @@ LRESULT CALLBACK NotifyIconHost::WndProc(HWND hwnd,
 
       case WM_LBUTTONDOWN:
       case WM_RBUTTONDOWN:
+      case WM_MBUTTONDOWN:
       case WM_LBUTTONDBLCLK:
       case WM_RBUTTONDBLCLK:
+      case WM_MBUTTONDBLCLK:
       case WM_CONTEXTMENU:
         // Walk our icons, find which one was clicked on, and invoke its
         // HandleClickEvent() method.
@@ -200,7 +202,8 @@ LRESULT CALLBACK NotifyIconHost::WndProc(HWND hwnd,
                 &NotifyIcon::HandleClickEvent, win_icon_weak,
                 GetKeyboardModifiers(),
                 (lparam == WM_LBUTTONDOWN || lparam == WM_LBUTTONDBLCLK),
-                (lparam == WM_LBUTTONDBLCLK || lparam == WM_RBUTTONDBLCLK)));
+                (lparam == WM_LBUTTONDBLCLK || lparam == WM_RBUTTONDBLCLK),
+                (lparam == WM_MBUTTONDOWN || lparam == WM_MBUTTONDBLCLK)));
 
         return TRUE;