Windows mobile: hide [X] button in task bar on unmaximize

When calling showNormal on a window that was maximized, we must remove
the [X] button from the task bar. But only if it was added by
qt_wince_maximize.

Task-number: QTBUG-8408
Reviewed-by: Martin Petersson

1 files changed, 17 insertions, 0 deletions

diff --git a/src/gui/kernel/qguifunctions_wince.cpp b/src/gui/kernel/qguifunctions_wince.cpp
index bdaed65..377dfe3 100644
--- a/src/gui/kernel/qguifunctions_wince.cpp
+++ b/src/gui/kernel/qguifunctions_wince.cpp
@@ -76,6 +76,10 @@ struct AygSIPINFO
 #define SHIDIF_SIZEDLGFULLSCREEN 0x0004
 #endif
 
+#ifndef SHDB_HIDE
+#define SHDB_HIDE 0x0002
+#endif
+
 #ifndef SHFS_SHOWTASKBAR
 #define SHFS_SHOWTASKBAR 0x0001
 #endif
@@ -112,10 +116,12 @@ struct AygSIPINFO
 typedef BOOL (*AygInitDialog)(AygSHINITDLGINFO*);
 typedef BOOL (*AygFullScreen)(HWND, DWORD);
 typedef BOOL (*AygSHSipInfo)(UINT, UINT, PVOID, UINT);
+typedef BOOL (*AygSHDoneButton)(HWND, DWORD);
 
 static AygInitDialog ptrAygInitDialog = 0;
 static AygFullScreen ptrAygFullScreen = 0;
 static AygSHSipInfo  ptrAygSHSipInfo  = 0;
+static AygSHDoneButton ptrAygSHDoneButton = 0;
 static bool aygResolved = false;
 
 static void resolveAygLibs()
@@ -128,6 +134,7 @@ static void resolveAygLibs()
         ptrAygInitDialog = (AygInitDialog) ayglib.resolve("SHInitDialog");
         ptrAygFullScreen = (AygFullScreen) ayglib.resolve("SHFullScreen");
         ptrAygSHSipInfo  = (AygSHSipInfo)  ayglib.resolve("SHSipInfo");
+        ptrAygSHDoneButton = (AygSHDoneButton) ayglib.resolve("SHDoneButton");
     }
 }
 
@@ -327,6 +334,16 @@ void qt_wince_maximize(QWidget *widget)
     }
 }
 
+void qt_wince_unmaximize(QWidget *widget)
+{
+    if (ptrAygSHDoneButton && qt_wince_is_mobile()
+        && !(widget->windowFlags() & (Qt::WindowCancelButtonHint | Qt::WindowOkButtonHint)))
+    {
+        // Hide the [X] button, we've added in qt_wince_maximize.
+        ptrAygSHDoneButton(widget->winId(), SHDB_HIDE);
+    }
+}
+
 void qt_wince_minimize(HWND hwnd)
 {
 #ifdef Q_OS_WINCE_WM