Merge #30: Disable the main window toolbar when the modal overlay is shown

d0cc1f6 qt: Disable toolbar when overlay is shown (Hennadii Stepanov)
e74cd20 qt, refactor: Cleanup ModalOverlay slots (Hennadii Stepanov)

Pull request description:

  Keeping the main window toolbar activated while the modal overlay is shown could create the appearance of the non-responsive GUI.

  Fixes #22.

  ---

  On master (ca05588):

  ![Screenshot from 2020-07-11 13-07-00](https://user-images.githubusercontent.com/32963518/87221791-7504e100-c377-11ea-9689-ddd4b21b98f9.png)

  With this PR:

  ![Screenshot from 2020-07-11 13-07-39](https://user-images.githubusercontent.com/32963518/87221803-8817b100-c377-11ea-92c8-3602dc4d2451.png)

ACKs for top commit:
  harding:
    Tested ACK d0cc1f6.  Tested on Linux/X11 as much as I could given it's a pretty small change; seems like a nice improvement.  I'm not experienced in Qt, but I don't see anything obviously problematic about the code.
  jonatack:
    ACK d0cc1f6 tested on Debian 5.7.6-1 (2020-06-24) x86_64 GNU/Linux
  LarryRuane:
    ACK d0cc1f6 tested on Ubuntu 18.04.4 LTS

Tree-SHA512: e371b34231c01e77118deb100e0f280ba1cdef54e317f7f7d6ac322598bda811bd1bfe3035e90d87f8267f4f5d2095d34a8136911159db63694fd1b1b11335a1

Author: MarcoFalke

src/qt/bitcoingui.cpp

@@ -112,6 +112,8 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
         Q_EMIT consoleShown(rpcConsole);
     }
 
+    modalOverlay = new ModalOverlay(enableWallet, this->centralWidget());
+
     // Accept D&D of URIs
     setAcceptDrops(true);
 
@@ -201,7 +203,6 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
         openOptionsDialogWithTab(OptionsDialog::TAB_NETWORK);
     });
 
-    modalOverlay = new ModalOverlay(enableWallet, this->centralWidget());
     connect(labelBlocksIcon, &GUIUtil::ClickableLabel::clicked, this, &BitcoinGUI::showModalOverlay);
     connect(progressBar, &GUIUtil::ClickableProgressBar::clicked, this, &BitcoinGUI::showModalOverlay);
 #ifdef ENABLE_WALLET
@@ -238,6 +239,7 @@ BitcoinGUI::~BitcoinGUI()
 void BitcoinGUI::createActions()
 {
     QActionGroup *tabGroup = new QActionGroup(this);
+    connect(modalOverlay, &ModalOverlay::triggered, tabGroup, &QActionGroup::setEnabled);
 
     overviewAction = new QAction(platformStyle->SingleColorIcon(":/icons/overview"), tr("&Overview"), this);
     overviewAction->setStatusTip(tr("Show general overview of wallet"));

src/qt/modaloverlay.cpp

@@ -171,6 +171,8 @@ void ModalOverlay::showHide(bool hide, bool userRequested)
     if ( (layerIsVisible && !hide) || (!layerIsVisible && hide) || (!hide && userClosed && !userRequested))
         return;
 
+    Q_EMIT triggered(hide);
+
     if (!isVisible() && !hide)
         setVisible(true);
 

src/qt/modaloverlay.h

@@ -25,16 +25,20 @@ class ModalOverlay : public QWidget
     explicit ModalOverlay(bool enable_wallet, QWidget *parent);
     ~ModalOverlay();
 
-public Q_SLOTS:
     void tipUpdate(int count, const QDateTime& blockDate, double nVerificationProgress);
     void setKnownBestHeight(int count, const QDateTime& blockDate);
 
-    void toggleVisibility();
     // will show or hide the modal layer
     void showHide(bool hide = false, bool userRequested = false);
-    void closeClicked();
     bool isLayerVisible() const { return layerIsVisible; }
 
+public Q_SLOTS:
+    void toggleVisibility();
+    void closeClicked();
+
+Q_SIGNALS:
+    void triggered(bool hidden);
+
 protected:
     bool eventFilter(QObject * obj, QEvent * ev) override;
     bool event(QEvent* ev) override;