Merge bitcoin-core/gui#29: refactor: Optimize signal-slot connections logic

62cb8d98d27e7f316f01f177f35ad0ed6f8cd9ce qt: Drop BitcoinGUI* WalletFrame data member (Hennadii Stepanov)
f73e5c972ab096e0f80cb9e753fa221d17313358 qt: Move CreateWalletActivity connection from WalletFrame to BitcoinGUI (Hennadii Stepanov)
20e2e24e90d782219e853ef0676ac66dc6a9de6a qt: Move WalletView connections from WalletFrame to BitcoinGUI (Hennadii Stepanov)

Pull request description:

  This PR:
  - implements an idea from https://github.com/bitcoin/bitcoin/pull/17937#issuecomment-575991765
  - simplifies `WalletFrame` class interface
  - as a side effect, removes `bitcoingui` -> `walletframe` -> `bitcoingui` circular dependency
  - is an alternative to https://github.com/bitcoin/bitcoin/pull/17500

ACKs for top commit:
  promag:
    Tested ACK 62cb8d98d27e7f316f01f177f35ad0ed6f8cd9ce on macos 11.2.3 with depends build.
  jarolrod:
    ACK 62cb8d98d27e7f316f01f177f35ad0ed6f8cd9ce

Tree-SHA512: 633b526a8499ba9ab4b16928daf4de4f6d610284bb9fa51891cad35300a03bde740df3466a71b46e87a62121330fcc9e606eac7666ea5e45fa6d5785b60dcbbd

4 files changed, 30 insertions, 32 deletions

diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index e5dde88bd1..50f6e739e8 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -105,6 +105,11 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
     {
         /** Create wallet frame and make it the central widget */
         walletFrame = new WalletFrame(_platformStyle, this);
+        connect(walletFrame, &WalletFrame::createWalletButtonClicked, [this] {
+            auto activity = new CreateWalletActivity(getWalletController(), this);
+            connect(activity, &CreateWalletActivity::finished, activity, &QObject::deleteLater);
+            activity->create();
+        });
         setCentralWidget(walletFrame);
     } else
 #endif // ENABLE_WALLET
@@ -671,7 +676,10 @@ WalletController* BitcoinGUI::getWalletController()
 void BitcoinGUI::addWallet(WalletModel* walletModel)
 {
     if (!walletFrame) return;
-    if (!walletFrame->addWallet(walletModel)) return;
+
+    WalletView* wallet_view = new WalletView(platformStyle, walletFrame);
+    if (!walletFrame->addWallet(walletModel, wallet_view)) return;
+
     rpcConsole->addWallet(walletModel);
     if (m_wallet_selector->count() == 0) {
         setWalletActionsEnabled(true);
@@ -681,6 +689,18 @@ void BitcoinGUI::addWallet(WalletModel* walletModel)
     }
     const QString display_name = walletModel->getDisplayName();
     m_wallet_selector->addItem(display_name, QVariant::fromValue(walletModel));
+
+    connect(wallet_view, &WalletView::outOfSyncWarningClicked, walletFrame, &WalletFrame::outOfSyncWarningClicked);
+    connect(wallet_view, &WalletView::transactionClicked, this, &BitcoinGUI::gotoHistoryPage);
+    connect(wallet_view, &WalletView::coinsSent, this, &BitcoinGUI::gotoHistoryPage);
+    connect(wallet_view, &WalletView::message, [this](const QString& title, const QString& message, unsigned int style) {
+        this->message(title, message, style);
+    });
+    connect(wallet_view, &WalletView::encryptionStatusChanged, this, &BitcoinGUI::updateWalletStatus);
+    connect(wallet_view, &WalletView::incomingTransaction, this, &BitcoinGUI::incomingTransaction);
+    connect(wallet_view, &WalletView::hdEnabledStatusChanged, this, &BitcoinGUI::updateWalletStatus);
+    connect(this, &BitcoinGUI::setPrivacy, wallet_view, &WalletView::setPrivacy);
+    wallet_view->setPrivacy(isPrivacyModeActivated());
 }
 
 void BitcoinGUI::removeWallet(WalletModel* walletModel)
diff --git a/src/qt/walletframe.cpp b/src/qt/walletframe.cpp
index 02b3c62867..0f2ea99685 100644
--- a/src/qt/walletframe.cpp
+++ b/src/qt/walletframe.cpp
@@ -4,10 +4,7 @@
 
 #include <qt/walletframe.h>
 
-#include <qt/bitcoingui.h>
-#include <qt/createwalletdialog.h>
 #include <qt/overviewpage.h>
-#include <qt/walletcontroller.h>
 #include <qt/walletmodel.h>
 #include <qt/walletview.h>
 
@@ -19,9 +16,8 @@
 #include <QPushButton>
 #include <QVBoxLayout>
 
-WalletFrame::WalletFrame(const PlatformStyle* _platformStyle, BitcoinGUI* _gui)
-    : QFrame(_gui),
-      gui(_gui),
+WalletFrame::WalletFrame(const PlatformStyle* _platformStyle, QWidget* parent)
+    : QFrame(parent),
       platformStyle(_platformStyle),
       m_size_hint(OverviewPage{platformStyle, nullptr}.sizeHint())
 {
@@ -42,11 +38,7 @@ WalletFrame::WalletFrame(const PlatformStyle* _platformStyle, BitcoinGUI* _gui)
 
     // A button for create wallet dialog
     QPushButton* create_wallet_button = new QPushButton(tr("Create a new wallet"), walletStack);
-    connect(create_wallet_button, &QPushButton::clicked, [this] {
-        auto activity = new CreateWalletActivity(gui->getWalletController(), this);
-        connect(activity, &CreateWalletActivity::finished, activity, &QObject::deleteLater);
-        activity->create();
-    });
+    connect(create_wallet_button, &QPushButton::clicked, this, &WalletFrame::createWalletButtonClicked);
     no_wallet_layout->addWidget(create_wallet_button, 0, Qt::AlignHCenter | Qt::AlignTop);
     no_wallet_group->setLayout(no_wallet_layout);
 
@@ -66,17 +58,15 @@ void WalletFrame::setClientModel(ClientModel *_clientModel)
     }
 }
 
-bool WalletFrame::addWallet(WalletModel *walletModel)
+bool WalletFrame::addWallet(WalletModel* walletModel, WalletView* walletView)
 {
-    if (!gui || !clientModel || !walletModel) return false;
+    if (!clientModel || !walletModel) return false;
 
     if (mapWalletViews.count(walletModel) > 0) return false;
 
-    WalletView *walletView = new WalletView(platformStyle, this);
     walletView->setClientModel(clientModel);
     walletView->setWalletModel(walletModel);
     walletView->showOutOfSyncWarning(bOutOfSync);
-    walletView->setPrivacy(gui->isPrivacyModeActivated());
 
     WalletView* current_wallet_view = currentWalletView();
     if (current_wallet_view) {
@@ -88,17 +78,6 @@ bool WalletFrame::addWallet(WalletModel *walletModel)
     walletStack->addWidget(walletView);
     mapWalletViews[walletModel] = walletView;
 
-    connect(walletView, &WalletView::outOfSyncWarningClicked, this, &WalletFrame::outOfSyncWarningClicked);
-    connect(walletView, &WalletView::transactionClicked, gui, &BitcoinGUI::gotoHistoryPage);
-    connect(walletView, &WalletView::coinsSent, gui, &BitcoinGUI::gotoHistoryPage);
-    connect(walletView, &WalletView::message, [this](const QString& title, const QString& message, unsigned int style) {
-        gui->message(title, message, style);
-    });
-    connect(walletView, &WalletView::encryptionStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
-    connect(walletView, &WalletView::incomingTransaction, gui, &BitcoinGUI::incomingTransaction);
-    connect(walletView, &WalletView::hdEnabledStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
-    connect(gui, &BitcoinGUI::setPrivacy, walletView, &WalletView::setPrivacy);
-
     return true;
 }
 
diff --git a/src/qt/walletframe.h b/src/qt/walletframe.h
index f57f8678d6..844ed121a0 100644
--- a/src/qt/walletframe.h
+++ b/src/qt/walletframe.h
@@ -8,7 +8,6 @@
 #include <QFrame>
 #include <QMap>
 
-class BitcoinGUI;
 class ClientModel;
 class PlatformStyle;
 class SendCoinsRecipient;
@@ -31,12 +30,12 @@ class WalletFrame : public QFrame
     Q_OBJECT
 
 public:
-    explicit WalletFrame(const PlatformStyle *platformStyle, BitcoinGUI *_gui = nullptr);
+    explicit WalletFrame(const PlatformStyle* platformStyle, QWidget* parent);
     ~WalletFrame();
 
     void setClientModel(ClientModel *clientModel);
 
-    bool addWallet(WalletModel *walletModel);
+    bool addWallet(WalletModel* walletModel, WalletView* walletView);
     void setCurrentWallet(WalletModel* wallet_model);
     void removeWallet(WalletModel* wallet_model);
     void removeAllWallets();
@@ -51,9 +50,10 @@ Q_SIGNALS:
     /** Notify that the user has requested more information about the out-of-sync warning */
     void requestedSyncWarningInfo();
 
+    void createWalletButtonClicked();
+
 private:
     QStackedWidget *walletStack;
-    BitcoinGUI *gui;
     ClientModel *clientModel;
     QMap<WalletModel*, WalletView*> mapWalletViews;
 
diff --git a/test/lint/lint-circular-dependencies.sh b/test/lint/lint-circular-dependencies.sh
index 07d613f62d..f8f24bb1ff 100755
--- a/test/lint/lint-circular-dependencies.sh
+++ b/test/lint/lint-circular-dependencies.sh
@@ -17,7 +17,6 @@ EXPECTED_CIRCULAR_DEPENDENCIES=(
     "index/coinstatsindex -> node/coinstats -> index/coinstatsindex"
     "policy/fees -> txmempool -> policy/fees"
     "qt/addresstablemodel -> qt/walletmodel -> qt/addresstablemodel"
-    "qt/bitcoingui -> qt/walletframe -> qt/bitcoingui"
     "qt/recentrequeststablemodel -> qt/walletmodel -> qt/recentrequeststablemodel"
     "qt/sendcoinsdialog -> qt/walletmodel -> qt/sendcoinsdialog"
     "qt/transactiontablemodel -> qt/walletmodel -> qt/transactiontablemodel"