initial

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -59,9 +59,32 @@ namespace winrt::TerminalApp::implementation
     HRESULT TerminalPage::Initialize(HWND hwnd)
     {
         _hostingHwnd = hwnd;
+
+        TestNotifyIconFunction();
+
         return S_OK;
     }
 
+    void TerminalPage::TestNotifyIconFunction()
+    {
+        if (_hostingHwnd)
+        {
+            NOTIFYICONDATA nid{};
+
+            nid.hWnd = _hostingHwnd.value();
+            nid.uID = 1;
+            nid.uCallbackMessage = WM_APP + 1;
+            StringCchCopy(nid.szTip, ARRAYSIZE(nid.szTip), L"Windows Terminal");
+            nid.uFlags = NIF_MESSAGE | NIF_SHOWTIP | NIF_TIP;
+
+            // Add the icon to the tray
+            Shell_NotifyIcon(NIM_ADD, &nid);
+
+            nid.uVersion = NOTIFYICON_VERSION_4;
+            Shell_NotifyIcon(NIM_SETVERSION, &nid);
+        }
+    }
+
     // Function Description:
     // - Recursively check our commands to see if there's a keybinding for
     //   exactly their action. If there is, label that command with the text

src/cascadia/TerminalApp/TerminalPage.h

@@ -341,6 +341,8 @@ namespace winrt::TerminalApp::implementation
 
         void _SetFocusMode(const bool inFocusMode);
 
+        void TestNotifyIconFunction();
+
 #pragma region ActionHandlers
         // These are all defined in AppActionHandlers.cpp
 #define ON_ALL_ACTIONS(action) DECLARE_ACTION_HANDLER(action);

src/cascadia/WindowsTerminal/AppHost.cpp

@@ -77,6 +77,7 @@ AppHost::AppHost() noexcept :
     _window->MouseScrolled({ this, &AppHost::_WindowMouseWheeled });
     _window->WindowActivated({ this, &AppHost::_WindowActivated });
     _window->HotkeyPressed({ this, &AppHost::_GlobalHotkeyPressed });
+    _window->NotifyIconPressed({ this, &AppHost::_NotifyIconPressed });
     _window->SetAlwaysOnTop(_logic.GetInitialAlwaysOnTop());
     _window->MakeWindow();
 
@@ -917,3 +918,22 @@ void AppHost::_IsQuakeWindowChanged(const winrt::Windows::Foundation::IInspectab
 {
     _window->IsQuakeWindow(_logic.IsQuakeWindow());
 }
+
+void AppHost::_NotifyIconPressed()
+{
+    // No name provided means show the MRU window.
+    Remoting::SummonWindowSelectionArgs args{};
+
+    // For now, just show the window where it originally was.
+    args.OnCurrentDesktop(true);
+    args.SummonBehavior().MoveToCurrentDesktop(false);
+    args.SummonBehavior().ToggleVisibility(false);
+    args.SummonBehavior().DropdownDuration(0);
+    args.SummonBehavior().ToMonitor(Remoting::MonitorBehavior::ToCurrent);
+
+    _windowManager.SummonWindow(args);
+    if (args.FoundMatch())
+    {
+        // Excellent, the window was found. We have nothing else to do here.
+    }
+}

src/cascadia/WindowsTerminal/AppHost.h

@@ -81,4 +81,6 @@ class AppHost
 
     void _IsQuakeWindowChanged(const winrt::Windows::Foundation::IInspectable& sender,
                                const winrt::Windows::Foundation::IInspectable& args);
+
+    void _NotifyIconPressed();
 };

src/cascadia/WindowsTerminal/IslandWindow.cpp

@@ -506,6 +506,26 @@ long IslandWindow::_calculateTotalSize(const bool isWidth, const long clientSize
     case WM_THEMECHANGED:
         UpdateWindowIconForActiveMetrics(_window.get());
         return 0;
+    // TODO: Give this a better name, something like WT_NOTIFYICON
+    // WM_APP to 0xBFFF is available for use for apps.
+    case WM_APP + 1:
+    {
+        switch (LOWORD(lparam))
+        {
+        case NIN_SELECT:
+        {
+            _NotifyIconPressedHandlers();
+            break;
+        }
+        case WM_CONTEXTMENU:
+        {
+            // TODO: show the context menu
+            // Build it with ways to open specific windows
+            break;
+        }
+        }
+        break;
+    }
     }
 
     // TODO: handle messages here...

src/cascadia/WindowsTerminal/IslandWindow.h

@@ -51,6 +51,7 @@ class IslandWindow :
     WINRT_CALLBACK(MouseScrolled, winrt::delegate<void(til::point, int32_t)>);
     WINRT_CALLBACK(WindowActivated, winrt::delegate<void()>);
     WINRT_CALLBACK(HotkeyPressed, winrt::delegate<void(long)>);
+    WINRT_CALLBACK(NotifyIconPressed, winrt::delegate<void()>);
 
 protected:
     void ForceResize()