Allow main window to resize to much smaller size when needed. Should help people with small screens to resize RS window appropriately (patch from Manuel Davis)

retroshare-gui/src/gui/mainpagestack.cpp

@@ -20,6 +20,26 @@
  *  Boston, MA  02110-1301, USA.
  ****************************************************************/
 
+/* ccr . 2015 Aug 01 . Resize Main page and Main window.
+ *
+ * On very small legacy CRTs of about 15" (38 cm) RetroShare pages are
+ * initially too deep (too tall) to fit the screen at 1024x768
+ * resolution.  Some can be shrunk down manually from their initial
+ * size.  Others cannot.  This patch tries to allow each page to be
+ * shrunk somewhat.  Then code that runs elsewhere to fit the logical
+ * Main window into the physical screen will have a better chance of
+ * success.  Notably, on Linux -- Gnome3 -- X11 systems, only when the
+ * Main window first fits entirely into the physical screen, can it
+ * then be maximized.
+ *
+ * This code is borrowed from a Stack Overflow post:
+ *
+ * o Darkgaze. "Resize QStackedWidget to the Page Which Is Opened." 23
+ * Jan. 2013. Online posting. Stack Overflow. 1 Aug. 2015
+ * <https://stackoverflow.com/questions/14480696/resize-qstackedwidget-to-the-page-which-is-opened>.
+ *
+ */
+
 #include <QAction>
 #include "mainpagestack.h"
 
@@ -34,6 +54,7 @@ void
 MainPageStack::add(MainPage *page, QAction *action)
 {
   _pages.insert(action, page);
+  page->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);  /* 2015 Aug 01 */
   insertWidget(count(), page);
 }
 
@@ -61,3 +82,14 @@ MainPageStack::showPage(QAction *pageAction)
   setCurrentWidget(_pages.value(pageAction));
 }
 
+/** Adjusts the size of the Main page and the Main window. */
+void
+MainPageStack::onCurrentChanged(int index)  /* 2015 Aug 01 */
+{
+   QWidget* pWidget = widget(index);
+   Q_ASSERT(pWidget);
+   pWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+   pWidget->adjustSize();
+   adjustSize();
+}
+

retroshare-gui/src/gui/mainpagestack.h

@@ -50,6 +50,8 @@ public:
 public slots:
   /** Displays the page associated with the activated action. */
   void showPage(QAction *pageAction);
+  /** Adjusts the size of the Main page and the Main window. */
+  void onCurrentChanged(int index);
   
 private:
   /** Maps an action to a Main page. */