gui: network_view: add some help button to network graph

retroshare-gui/src/gui/NetworkView.cpp

@@ -59,6 +59,24 @@ NetworkView::NetworkView(QWidget *parent)
   connect( ui.freezeCheckBox, SIGNAL(toggled(bool)), this, SLOT(setFreezeState(bool)));
   connect( ui.nameBox, SIGNAL(textChanged(QString)), this, SLOT(setNameSearch(QString)));
 
+  QString help_text = tr(
+  "<h2>Graph scene info</h2>"
+  "<p>You could use mouse to deal with the scene here:</p>"
+  "<ul>"
+  "<li>Left mouse button press on a node: " "selection to see with which nodes it has connections"
+    " (you can drag it for some distance)"
+  "<li>Right mouse button click on a node: " "to do some actions with it"
+  "<li>Drag scene with left mouse button: " "to scroll"
+  "</ul>"
+  "<p>and keyboard:</p>"
+  "<ul>"
+  "<li>Arrow keys: " "to scroll"
+  "<li>Space/Enter: " "to repaint a scene"
+  "<li>+/-: " "to scale"
+  "</ul>"
+  );
+  registerHelpButton(ui.helpButton, help_text, "Graph scene");
+
   _should_update = true ;
 }
 

retroshare-gui/src/gui/NetworkView.ui

@@ -54,6 +54,20 @@
        </property>
       </widget>
      </item>
+     <item row="0" column="8">
+      <widget class="QToolButton" name="helpButton">
+       <property name="focusPolicy">
+        <enum>Qt::NoFocus</enum>
+       </property>
+       <property name="icon">
+        <iconset resource="icons.qrc">
+         <normaloff>:/icons/help_64.png</normaloff>:/icons/help_64.png</iconset>
+       </property>
+       <property name="checkable">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
      <item row="0" column="6">
       <spacer>
        <property name="orientation">