Added: Scroll bar for main chat tabs

--HG--
branch : develop

code/ryzom/client/data/gamedev/interfaces_v3/interaction.xml

@@ -1042,7 +1042,9 @@
                h="24"
                posref="TL TL"
                x="0"
-               y="-4">
+               y="-4"
+               max_w="0"
+               max_sizeref="w">
           <ctrl style="tab_button_new"
                 id="tab0"
                 x="0"
@@ -1183,6 +1185,22 @@
               texture="blank.tga"
               color="166 166 166 255" />
       </group>
+
+      <!-- scroll target element will be set from c++ code: it does not exist on template build time -->
+      <ctrl type="scroll"
+            id="channel_scroll"
+            vertical="false"
+            align="L"
+            y="-1"
+            h="4"
+            scale="true"
+            posref="BL TL"
+            posparent="header_opened"
+            tx_bottomleft="skin_scroll_l.tga"
+            tx_middle="skin_scroll_h.tga"
+            tx_topright="skin_scroll_r.tga"
+            target="" />
+
       <group id="content"
              x="0"
              y="0"

code/ryzom/client/src/interface_v3/chat_window.cpp

@@ -1142,6 +1142,15 @@ CChatWindow *CChatWindowManager::createChatGroupWindow(const CChatWindowDesc &de
 		if (!desc.HeaderColor.empty())
 			w->setHeaderColor(desc.HeaderColor);
 
+
+		// because root group was created from template, element from scrollbar target attribute was not created yet
+		CInterfaceGroup *pIG = w->getContainer()->getGroup("header_opened:channel_select");
+		if (pIG)
+		{
+			CCtrlScroll *sb = dynamic_cast<CCtrlScroll*>(w->getContainer()->getCtrl("channel_scroll"));
+			if (sb) sb->setTarget(pIG);
+		}
+
 		return w;
 	}
 	else