refs #312 navigation bars, contributes also to #347

* allow to set/unset frameless mode in CDockWidget
* adjusted context menus
* adjusted style sheets
* ini settings for margins
* hidden info area to host floating widgets only visible when floating (allows to CDockInfoArea widgets)
* made some private slots non-virtual

src/blackgui/qss/gui.ini

@@ -1,5 +1,12 @@
-[infoarea]
-; margins as used in infoarea.cpp
+[alias]
+; those are the component names and valid until an object name is set
+; in most cases the object name is not yet known in the constructor
+; this alias makes sense as long there is one object per component
+CMainInfoAreaComponent = comp_MainInfoArea
+CCockpitInfoAreaComponent = comp_CockpitInfoArea
+CInfoBarStatusComponent = dw_dw_InfoBarStatus
+
+[comp_MainInfoArea]
 margindocked.left = 1
 margindocked.right = 1
 margindocked.top = 1
@@ -8,4 +15,41 @@ margindocked.bottom = 1
 marginfloating.left = 5
 marginfloating.right = 20
 marginfloating.top = 5
-marginfloating.bottom = 20
+marginfloating.bottom = 40
+
+marginfloating.frameless.left = 5
+marginfloating.frameless.right = 5
+marginfloating.frameless.top = 5
+marginfloating.frameless.bottom = 5
+
+[comp_CockpitInfoArea]
+margindocked.left = 1
+margindocked.right = 1
+margindocked.top = 1
+margindocked.bottom = 1
+
+marginfloating.left = 5
+marginfloating.right = 20
+marginfloating.top = 5
+marginfloating.bottom = 40
+
+marginfloating.frameless.left = 5
+marginfloating.frameless.right = 5
+marginfloating.frameless.top = 5
+marginfloating.frameless.bottom = 5
+
+[dw_InfoBarStatus]
+margindocked.left = 0
+margindocked.right = 0
+margindocked.top = 0
+margindocked.bottom = 0
+
+marginfloating.left = 0
+marginfloating.right = 0
+marginfloating.top = 0
+marginfloating.bottom = 0
+
+marginfloating.frameless.left = 0
+marginfloating.frameless.right = 0
+marginfloating.frameless.top = 0
+marginfloating.frameless.bottom = 0

src/blackgui/qss/infobar.qss

@@ -1,14 +1,13 @@
+/** style is applied to a CDockWidgetInfoBar **/
+/** frameless is dynamic property**/
+/** for frameless only use QDockWidget[frameless="true"] QFrame **/
+
 QFrame {
   margin: 0px;
   padding-left: 6px;
   padding-right: 6px;
   padding-bottom: 0px;
-}
-
-/** frameless is dynamic property**/
-/** for frameless only use QDockWidget[frameless="true"] QFrame **/
-QDockWidget QFrame
- {
+  padding-top: 0px;
   background-color: darkslategray;
   background-image: url(:/textures/icons/textures/texture-outer.jpg);
   border: 0px;

src/blackgui/qss/mainwindow.qss

@@ -19,25 +19,29 @@ QMainWindow {
 
 /** required when dock widget is floating **/
 /** background-image not working on QDockWidget, so I use direct children **/
-#sw_MainMiddle BlackGui--CDockWidgetInfoArea {
+BlackGui--CDockWidgetInfoArea[frameless="false"] {
   background-color: black;
 }
 
+BlackGui--CDockWidgetInfoArea[frameless="true"] {
+  background-color: white;
+}
+
 /** this is the first widget in the dock area **/
 /** all dock widgets shall have this QWidget as container **/
-#sw_MainMiddle BlackGui--CDockWidgetInfoArea > QWidget {
+BlackGui--CDockWidgetInfoArea > QWidget {
   background-color: black;
   background-image: url(:/textures/icons/textures/texture-inner.jpg);
 }
 
 /** the following QFrame, likely the component itself
-#sw_MainMiddle BlackGui--CDockWidgetInfoArea > QWidget > QFrame {
-    border: 0px;
-    padding: 0px;
+BlackGui--CDockWidgetInfoArea > QWidget > QFrame {
+  border: 0px;
+  padding: 0px;
 }
 
 /** fix the menu, which is overridden by the above QWidget **/
-#sw_MainMiddle BlackGui--CDockWidgetInfoArea > QMenu {
+BlackGui--CDockWidgetInfoArea > QMenu {
   border: 1px solid darkslategray; /* reserve space for selection border */
   background: lightgray;
   color: black;
@@ -74,7 +78,10 @@ QAbstractScrollArea #pg_StatusPageConsole  { background-color: black; }
 /** dw_InfoBarStatus has its own style sheet **/
 
 #fr_CentralFrameInside {
-  margin: 5px;
+  margin-right: 5px;
+  margin-left: 5px;
+  margin-top: 2px;
+  margin-bottom: 5px;
 }
 
 #gb_AtcStationsOnlineInfo {