hw/xwin: Add a simple interface to the ITaskbarList COM interface

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>

hw/xwin/Makefile.am

@@ -102,6 +102,7 @@ SRCS =	InitInput.c \
 	winshaddd.c \
 	winshadddnl.c \
 	winshadgdi.c \
+	wintaskbar.c \
 	wintrayicon.c \
 	winvalargs.c \
 	winwakeup.c \

hw/xwin/wintaskbar.c

@@ -0,0 +1,92 @@
+/*
+  Permission is hereby granted, free of charge, to any person obtaining a
+  copy of this software and associated documentation files (the "Software"),
+  to deal in the Software without restriction, including without limitation
+  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+  and/or sell copies of the Software, and to permit persons to whom the
+  Software is furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice (including the next
+  paragraph) shall be included in all copies or substantial portions of the
+  Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+  DEALINGS IN THE SOFTWARE.
+*/
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+
+#include "win.h"
+#include "winwindow.h"
+
+const GUID CLSID_TaskbarList = {0x56fdf344,0xfd6d,0x11d0,{0x95,0x8a,0x0,0x60,0x97,0xc9,0xa0,0x90}};
+const GUID IID_ITaskbarList =  {0x56fdf342,0xfd6d,0x11d0,{0x95,0x8a,0x0,0x60,0x97,0xc9,0xa0,0x90}};
+
+#ifdef INTERFACE
+#undef INTERFACE
+#endif
+
+#define INTERFACE ITaskbarList
+DECLARE_INTERFACE_(ITaskbarList, IUnknown)
+{
+  /* IUnknown methods */
+  STDMETHOD(QueryInterface) (THIS_ REFIID riid, void **ppv) PURE;
+  STDMETHOD_(ULONG, AddRef) (THIS) PURE;
+  STDMETHOD_(ULONG, Release) (THIS) PURE;
+
+  /* ITaskbarList methods */
+  STDMETHOD(HrInit) (THIS) PURE;
+  STDMETHOD(AddTab) (THIS_ HWND hWnd) PURE;
+  STDMETHOD(DeleteTab) (THIS_ HWND hWnd) PURE;
+  STDMETHOD(ActivateTab) (THIS_ HWND hWnd) PURE;
+  STDMETHOD(SetActiveAlt) (THIS_ HWND hWnd) PURE;
+};
+#undef INTERFACE
+
+/*
+   The stuff above needs to be in win32api headers, not defined here,
+   or at least generated from the MIDL :-)
+*/
+
+/*
+  This is unnecessarily heavyweight, we could just call CoInitialize() once at
+   startup and CoUninitialize() once at shutdown
+*/
+
+/*
+  The documentation for ITaskbarList::AddTab says that we are responsible for
+   deleting the tab ourselves when the window is deleted, but that doesn't actually
+   seem to be the case
+*/
+
+void winShowWindowOnTaskbar(HWND hWnd, BOOL show)
+{
+  ITaskbarList* pTaskbarList = NULL;
+
+  if (SUCCEEDED(CoInitialize(NULL)))
+    {
+      if (SUCCEEDED(CoCreateInstance((const CLSID *)&CLSID_TaskbarList, NULL, CLSCTX_INPROC_SERVER, (const IID *)&IID_ITaskbarList, (void**)&pTaskbarList)))
+        {
+          if (SUCCEEDED(pTaskbarList->lpVtbl->HrInit(pTaskbarList)))
+            {
+              if (show)
+                {
+                  pTaskbarList->lpVtbl->AddTab(pTaskbarList,hWnd);
+                }
+              else
+                {
+                  pTaskbarList->lpVtbl->DeleteTab(pTaskbarList,hWnd);
+                }
+            }
+          pTaskbarList->lpVtbl->Release(pTaskbarList);
+        }
+      CoUninitialize();
+    }
+}

hw/xwin/winwindow.h

@@ -157,5 +157,8 @@ void
 void
  winSetAppUserModelID(HWND hWnd, const char *AppID);
 
+void
+ winShowWindowOnTaskbar(HWND hWnd, BOOL show);
+
 #endif                          /* XWIN_MULTIWINDOW */
 #endif