Add context menu to all table views

Add a context menu to all table view widgets in the program (Browse Data
tab and Execute SQL tab) which opens when right clicking a table item.

Currently the menu only allows you to copy and paste the selected
item(s).

Only activate the paste action when the current view is writable.

src/ExtendedTableWidget.cpp

@@ -12,6 +12,7 @@
 #include <QHeaderView>
 #include <QMessageBox>
 #include <QBuffer>
+#include <QMenu>
 
 namespace
 {
@@ -75,7 +76,34 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     m_tableHeader = new FilterTableHeader(this);
     setHorizontalHeader(m_tableHeader);
 
+    // Set up vertical header context menu
     verticalHeader()->setContextMenuPolicy(Qt::CustomContextMenu);
+
+    // Set up table view context menu
+    m_contextMenu = new QMenu(this);
+    QAction* copyAction = new QAction(QIcon(":/icons/copy"), "Copy", m_contextMenu);
+    QAction* pasteAction = new QAction(QIcon(":/icons/paste"), "Paste", m_contextMenu);
+    m_contextMenu->addAction(copyAction);
+    m_contextMenu->addAction(pasteAction);
+    setContextMenuPolicy(Qt::CustomContextMenu);
+
+    // Set up context menu actions
+    connect(this, static_cast<void(QTableView::*)(const QPoint&)>(&QTableView::customContextMenuRequested),
+            [=](const QPoint& pos)
+    {
+        // Try to find out whether the current view is editable and (de)activate menu options according to that
+        bool editable = editTriggers() != QAbstractItemView::NoEditTriggers;
+        pasteAction->setEnabled(editable);
+
+        // Show menu
+        m_contextMenu->popup(viewport()->mapToGlobal(pos));
+    });
+    connect(copyAction, &QAction::triggered, [&]() {
+       copy();
+    });
+    connect(pasteAction, &QAction::triggered, [&]() {
+       paste();
+    });
 }
 
 void ExtendedTableWidget::reloadSettings()

src/ExtendedTableWidget.h

@@ -6,6 +6,7 @@
 #include <QDropEvent>
 #include <QDragMoveEvent>
 
+class QMenu;
 class FilterTableHeader;
 
 class ExtendedTableWidget : public QTableView
@@ -47,6 +48,7 @@ protected:
     virtual void dropEvent(QDropEvent* event);
 
     FilterTableHeader* m_tableHeader;
+    QMenu* m_contextMenu;
 };
 
 #endif

src/icons/icons.qrc

@@ -54,5 +54,6 @@
         <file>folder.png</file>
         <file>database.png</file>
         <file>cog_go.png</file>
+        <file alias="paste">page_paste.png</file>
     </qresource>
 </RCC>