Add support for click event in Windows

systray.go

@@ -13,7 +13,9 @@ import (
 )
 
 var (
-	log = golog.LoggerFor("systray")
+	// ClickedCh is the channel which will be notified when the systray icon is clicked
+	ClickedCh = make(chan struct{})
+	log       = golog.LoggerFor("systray")
 
 	systrayReady  func()
 	systrayExit   func()
@@ -208,3 +210,11 @@ func systrayMenuItemSelected(id int32) {
 	default:
 	}
 }
+
+func systrayClicked() {
+	select {
+	case ClickedCh <- struct{}{}:
+	default:
+		showMenu()
+	}
+}

systray_nonwindows.go

@@ -23,6 +23,9 @@ func nativeLoop() {
 	C.nativeLoop()
 }
 
+func showMenu() {
+}
+
 func quit() {
 	C.quit()
 }

systray_windows.go

@@ -281,8 +281,10 @@ func (t *winTray) wndProc(hWnd windows.Handle, message uint32, wParam, lParam ui
 		systrayExit()
 	case t.wmSystrayMessage:
 		switch lParam {
-		case WM_RBUTTONUP, WM_LBUTTONUP:
+		case WM_RBUTTONUP:
 			t.showMenu()
+		case WM_LBUTTONUP:
+			systrayClicked()
 		}
 	case t.wmTaskbarCreated: // on explorer.exe restarts
 		t.muNID.Lock()
@@ -803,6 +805,10 @@ func nativeLoop() {
 	}
 }
 
+func showMenu() {
+	wt.showMenu()
+}
+
 func quit() {
 	const WM_CLOSE = 0x0010