RetroShare/retroshare-gui/src/gui/mainpagestack.cpp

/****************************************************************
 * This file is distributed under the following license:
 *
 * Copyright (c) 2006-2007, crypton
 * Copyright (c) 2006, Matt Edman, Justin Hipple
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, 
 *  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"

/** Default constructor. */
MainPageStack::MainPageStack(QWidget *parent)
: QStackedWidget(parent)
{
}

/** Adds a page to the stack. */
void
MainPageStack::add(MainPage *page, QAction *action)
{
  _pages.insert(action, page);
  page->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);  /* 2015 Aug 01 */
  insertWidget(count(), page);
}

/** Sets the current Main page and checks its action. */
void
MainPageStack::setCurrentPage(MainPage *page)
{
  foreach (QAction *action, _pages.keys(page)) {
    action->setChecked(true);
  }
  setCurrentWidget(page);
}

/** Sets the current Main page index and checks its action. */
void
MainPageStack::setCurrentIndex(int index)
{
  setCurrentPage((MainPage *)widget(index));
}

/** Shows the Main page associated with the activated action. */
void
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();
}