Add remove from taskbar when minimized

README.references.txt

@@ -45,6 +45,10 @@ Intercept close event X11
 https://stackoverflow.com/questions/1157364/intercept-wm-delete-window-on-x11
 
 
+Allowed actions
+
+https://stackoverflow.com/questions/28495586/x11-how-to-set-net-wm-allowed-actions
+
 
 Qt X11
 

app/SysTray-X/windowctrl-unix.cpp

@@ -207,6 +207,82 @@ void    WindowCtrlUnix::minimizeWindow( Window window )
 }
 
 
+/*
+ *  Remove window from taskbar
+ */
+void    WindowCtrlUnix::skipTaskbarWindow( Window window, bool set )
+{
+    char prop_name[] = "_NET_WM_STATE";
+    Atom prop = XInternAtom( m_display, prop_name, True );
+    Atom prop_skip_taskbar = XInternAtom( m_display, WindowStates[ STATE_SKIP_TASKBAR ].toUtf8(), True );
+
+    Atom type;
+    int format;
+    unsigned long remain;
+    unsigned long len;
+    unsigned char* list = nullptr;
+
+    if( XGetWindowProperty( m_display, window, prop, 0, sizeof( Atom ), False, XA_ATOM,
+                &type, &format, &len, &remain, &list ) == Success )
+    {
+        Atom* atom_list = reinterpret_cast<Atom *>( list );
+        Atom* new_atom_list = nullptr;
+        bool present = false;
+
+        if( len > 1 )
+        {
+            /*
+             *  Check and remove atom from list
+             */
+            new_atom_list = new Atom[ len - 1 ];
+
+            for( unsigned long i = 0, o = 0; i < len; ++i )
+            {
+                if( atom_list[ i ] == prop_skip_taskbar )
+                {
+                    present = true;
+                    continue;
+                }
+
+                new_atom_list[ o++ ] = atom_list[ i ];
+            }
+        }
+
+        if( set && !present  )
+        {
+            /*
+             *  Set the atom
+             */
+            XChangeProperty( m_display, window, prop, XA_ATOM, 32, PropModeAppend, reinterpret_cast<unsigned char*>( &prop_skip_taskbar ), 1 );
+        }
+        else
+        if( !set && present )
+        {
+            /*
+             *  Remove the atom
+             */
+            XChangeProperty( m_display, window, prop, XA_ATOM, format, PropModeReplace, reinterpret_cast<unsigned char*>( new_atom_list ), static_cast<int>( len - 1 ) );
+        }
+
+        /*
+         *  Cleanup
+         */
+        if( new_atom_list )
+        {
+            delete [] new_atom_list;
+        }
+    }
+
+    /*
+     *  Cleanup
+     */
+    if( list )
+    {
+        XFree( list );
+    }
+}
+
+
 /*
  *  Normalize a window
  */
@@ -245,6 +321,8 @@ bool        WindowCtrlUnix::generateEvent()
 
 #ifdef  CHANGE_PROP
 
+//        XDeleteProperty( m_display, window, prop_skip_taskbar);
+
 void    WindowCtrlUnix::setAtomState()
 {
     char prop_name[] = "_NET_WM_STATE";

app/SysTray-X/windowctrl-unix.h

@@ -151,6 +151,8 @@ class WindowCtrlUnix : public QObject
          */
         void    normalizeWindow( Window window );
 
+        void    skipTaskbarWindow( Window window, bool set );
+
     private:
 
         /**

app/SysTray-X/windowctrl.cpp

@@ -54,7 +54,9 @@ void    WindowCtrl::slotWindowTest2()
     // Do something.
 
     unsigned long win_id = getWId();
+    skipTaskbarWindow( win_id, true );
     minimizeWindow( win_id );
+
 //    normalizeWindow( win_id );
 
     /*
@@ -77,6 +79,7 @@ void    WindowCtrl::slotWindowTest3()
     // Do something.
 
     unsigned long win_id = getWId();
+    skipTaskbarWindow( win_id, false );
     normalizeWindow( win_id );
 
     emit signalConsole("Test 3 done");