add FullScreen toolbar button

Add shortcut FullScreen (F11) in vnote.ini.

src/resources/icons/fullscreen.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 16.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="512px" height="512px" viewBox="0 0 512 512" style="enable-background:new 0 0 512 512;" xml:space="preserve">
+<path style="fill:#000000" d="M496,384V96H16v288h175v16h-64v16h257v-16h-64v-16H496z M32,112h448v256H32V112z"/>
+</svg>

src/resources/vnote.ini

@@ -259,6 +259,8 @@ ActivatePreviousTab=Ctrl+Shift+Tab
 FlashPage=Ctrl+Alt+L
 ; Open via system's default program
 OpenViaDefaultProgram=F12
+; Full screen
+FullScreen=F11
 
 [captain_mode_shortcuts]
 ; Define shortcuts in Captain mode here.

src/vmainwindow.cpp

@@ -428,6 +428,32 @@ void VMainWindow::initViewToolBar(QSize p_iconSize)
             });
 
     viewToolBar->addAction(expandViewAct);
+
+    m_fullScreenAct = new QAction(VIconUtils::toolButtonIcon(":/resources/icons/fullscreen.svg"),
+                                  tr("Full Screen"),
+                                  this);
+    QString keySeq = g_config->getShortcutKeySequence("FullScreen");
+    QKeySequence seq(keySeq);
+    if (!seq.isEmpty()) {
+        m_fullScreenAct->setText(tr("Full Screen\t%1").arg(VUtils::getShortcutText(keySeq)));
+        m_fullScreenAct->setShortcut(seq);
+    }
+
+    m_fullScreenAct->setStatusTip(tr("Toggle full screen"));
+    connect(m_fullScreenAct, &QAction::triggered,
+            this, [this]() {
+                if (windowState() & Qt::WindowFullScreen) {
+                    if (m_windowOldState & Qt::WindowMaximized) {
+                        showMaximized();
+                    } else {
+                        showNormal();
+                    }
+                } else {
+                    showFullScreen();
+                }
+            });
+
+    viewToolBar->addAction(m_fullScreenAct);
 }
 
 // Enable/disable all actions of @p_widget.

src/vmainwindow.h

@@ -334,12 +334,19 @@ private:
     QAction *saveNoteAct;
     QAction *saveExitAct;
     QAction *discardExitAct;
+
     QAction *expandViewAct;
+
+    QAction *m_fullScreenAct;
+
     QAction *m_importNoteAct;
+
     QAction *m_printAct;
+
     QAction *m_exportAsPDFAct;
 
     QAction *m_findReplaceAct;
+
     QAction *m_findNextAct;
     QAction *m_findPreviousAct;
     QAction *m_replaceAct;

src/vnote.qrc

@@ -237,5 +237,6 @@
         <file>resources/icons/clear_cart.svg</file>
         <file>resources/icons/cart.svg</file>
         <file>resources/icons/delete_cart_item.svg</file>
+        <file>resources/icons/fullscreen.svg</file>
     </qresource>
 </RCC>