Merge bitcoin-core/gui#618: refactor: Add `transactionoverviewwidget.cpp` source file

a50e0b1bcb120e097a2b23dbfb71533b2f9c4d6c qt, refactor: Add `transactionoverviewwidget.cpp` source file (Hennadii Stepanov)

Pull request description:

  The `TransactionOverviewWidget` class was added in bitcoin-core/gui#176 as a header-only one.

  Apparently, in upcoming [CMake project](https://github.com/hebasto/bitcoin/pull/3), CMake [AUTOMOC](https://cmake.org/cmake/help/latest/prop_tgt/AUTOMOC.html) could be integrated better/simpler, if `QObject`-derived class implementation been placed into a source file.

  From our [Developer Notes](https://github.com/bitcoin/bitcoin/blob/master/doc/developer-notes.md#source-code-organization):
  > Implementation code should go into the `.cpp` file and not the `.h`, unless necessary due to template usage or when performance due to inlining is critical.

ACKs for top commit:
  Sjors:
    tACK a50e0b1bcb120e097a2b23dbfb71533b2f9c4d6c
  shaavan:
    ACK a50e0b1bcb120e097a2b23dbfb71533b2f9c4d6c

Tree-SHA512: 4707b6be1c5e794c4014475f826ac45ec833e472db11f12d29995f9c5a599ee98622ad54f0af72734b192144b626411c69acdafa0e6d1a390bdebfd7e570f377

3 files changed, 31 insertions, 16 deletions

diff --git a/src/Makefile.qt.include b/src/Makefile.qt.include
index 72037b3db2..b4acc47aa1 100644
--- a/src/Makefile.qt.include
+++ b/src/Makefile.qt.include
@@ -270,6 +270,7 @@ BITCOIN_QT_WALLET_CPP = \
   qt/transactiondesc.cpp \
   qt/transactiondescdialog.cpp \
   qt/transactionfilterproxy.cpp \
+  qt/transactionoverviewwidget.cpp \
   qt/transactionrecord.cpp \
   qt/transactiontablemodel.cpp \
   qt/transactionview.cpp \
diff --git a/src/qt/transactionoverviewwidget.cpp b/src/qt/transactionoverviewwidget.cpp
new file mode 100644
index 0000000000..360a1364fb
--- /dev/null
+++ b/src/qt/transactionoverviewwidget.cpp
@@ -0,0 +1,27 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <qt/transactionoverviewwidget.h>
+
+#include <qt/transactiontablemodel.h>
+
+#include <QListView>
+#include <QSize>
+#include <QSizePolicy>
+
+TransactionOverviewWidget::TransactionOverviewWidget(QWidget* parent)
+    : QListView(parent) {}
+
+QSize TransactionOverviewWidget::sizeHint() const
+{
+    return {sizeHintForColumn(TransactionTableModel::ToAddress), QListView::sizeHint().height()};
+}
+
+void TransactionOverviewWidget::showEvent(QShowEvent* event)
+{
+    Q_UNUSED(event);
+    QSizePolicy sp = sizePolicy();
+    sp.setHorizontalPolicy(QSizePolicy::Minimum);
+    setSizePolicy(sp);
+}
diff --git a/src/qt/transactionoverviewwidget.h b/src/qt/transactionoverviewwidget.h
index 2bdead7bc4..0572e84090 100644
--- a/src/qt/transactionoverviewwidget.h
+++ b/src/qt/transactionoverviewwidget.h
@@ -5,11 +5,8 @@
 #ifndef BITCOIN_QT_TRANSACTIONOVERVIEWWIDGET_H
 #define BITCOIN_QT_TRANSACTIONOVERVIEWWIDGET_H
 
-#include <qt/transactiontablemodel.h>
-
 #include <QListView>
 #include <QSize>
-#include <QSizePolicy>
 
 QT_BEGIN_NAMESPACE
 class QShowEvent;
@@ -21,21 +18,11 @@ class TransactionOverviewWidget : public QListView
     Q_OBJECT
 
 public:
-    explicit TransactionOverviewWidget(QWidget* parent = nullptr) : QListView(parent) {}
-
-    QSize sizeHint() const override
-    {
-        return {sizeHintForColumn(TransactionTableModel::ToAddress), QListView::sizeHint().height()};
-    }
+    explicit TransactionOverviewWidget(QWidget* parent = nullptr);
+    QSize sizeHint() const override;
 
 protected:
-    void showEvent(QShowEvent* event) override
-    {
-        Q_UNUSED(event);
-        QSizePolicy sp = sizePolicy();
-        sp.setHorizontalPolicy(QSizePolicy::Minimum);
-        setSizePolicy(sp);
-    }
+    void showEvent(QShowEvent* event) override;
 };
 
 #endif // BITCOIN_QT_TRANSACTIONOVERVIEWWIDGET_H