Add context menu entry to clean the Recycle Bin in databases

This implements the feature request (issue) #503.

src/gui/DatabaseWidget.cpp

@@ -1267,3 +1267,38 @@ void DatabaseWidget::hideMessage()
         m_messageWidget->animatedHide();
     }
 }
+
+bool DatabaseWidget::isRecycleBinSelected() const
+{
+    return m_groupView->currentGroup() && m_groupView->currentGroup() == m_db->metadata()->recycleBin();
+}
+
+void DatabaseWidget::emptyTrash()
+{
+    Group* currentGroup = m_groupView->currentGroup();
+    if (!currentGroup) {
+        Q_ASSERT(false);
+        return;
+    }
+
+    if (currentGroup == m_db->metadata()->recycleBin()) {
+        QMessageBox::StandardButton result = MessageBox::question(
+            this, tr("Empty recycle bin?"),
+            tr("Are you sure you want to permanently delete everytning from your recycle bin?"),
+            QMessageBox::Yes | QMessageBox::No);
+
+        if (result == QMessageBox::Yes) {
+            // destroying direct entries of the recycle bin
+            QList<Entry*> subEntries = currentGroup->entries();
+            for (Entry* entry : subEntries) {
+                delete entry;
+            }
+            // destroying direct subgroups of the recycle bin
+            QList<Group*> subGroups = currentGroup->children();
+            for (Group* group : subGroups) {
+                delete group;
+            }
+            refreshSearch();
+        }
+    }
+}

src/gui/DatabaseWidget.h

@@ -102,6 +102,7 @@ public:
     void closeUnlockDialog();
     void blockAutoReload(bool block = true);
     void refreshSearch();
+    bool isRecycleBinSelected() const;
 
 signals:
     void closeRequest();
@@ -152,6 +153,7 @@ public slots:
     void switchToImportKeepass1(const QString& fileName);
     void databaseModified();
     void databaseSaved();
+    void emptyTrash();
 
     // Search related slots
     void search(const QString& searchtext);

src/gui/MainWindow.cpp

@@ -197,6 +197,7 @@ MainWindow::MainWindow()
     m_ui->actionGroupNew->setIcon(filePath()->icon("actions", "group-new", false));
     m_ui->actionGroupEdit->setIcon(filePath()->icon("actions", "group-edit", false));
     m_ui->actionGroupDelete->setIcon(filePath()->icon("actions", "group-delete", false));
+    m_ui->actionGroupEmptyTrash->setIcon(filePath()->icon("actions", "group-empty-trash", false));
 
     m_ui->actionSettings->setIcon(filePath()->icon("actions", "configure"));
     m_ui->actionSettings->setMenuRole(QAction::PreferencesRole);
@@ -295,6 +296,8 @@ MainWindow::MainWindow()
             SLOT(switchToGroupEdit()));
     m_actionMultiplexer.connect(m_ui->actionGroupDelete, SIGNAL(triggered()),
             SLOT(deleteGroup()));
+    m_actionMultiplexer.connect(m_ui->actionGroupEmptyTrash, SIGNAL(triggered()),
+            SLOT(emptyTrash()));
 
     connect(m_ui->actionSettings, SIGNAL(triggered()), SLOT(switchToSettings()));
     connect(m_ui->actionPasswordGenerator, SIGNAL(toggled(bool)), SLOT(switchToPasswordGen(bool)));
@@ -413,6 +416,7 @@ void MainWindow::setMenuActionState(DatabaseWidget::Mode mode)
             bool singleEntrySelected = dbWidget->numberOfSelectedEntries() == 1;
             bool entriesSelected = dbWidget->numberOfSelectedEntries() > 0;
             bool groupSelected = dbWidget->isGroupSelected();
+            bool recycleBinSelected = dbWidget->isRecycleBinSelected();
 
             m_ui->actionEntryNew->setEnabled(!inSearch);
             m_ui->actionEntryClone->setEnabled(singleEntrySelected);
@@ -429,6 +433,8 @@ void MainWindow::setMenuActionState(DatabaseWidget::Mode mode)
             m_ui->actionGroupNew->setEnabled(groupSelected);
             m_ui->actionGroupEdit->setEnabled(groupSelected);
             m_ui->actionGroupDelete->setEnabled(groupSelected && dbWidget->canDeleteCurrentGroup());
+            m_ui->actionGroupEmptyTrash->setVisible(recycleBinSelected);
+            m_ui->actionGroupEmptyTrash->setEnabled(recycleBinSelected);
             m_ui->actionChangeMasterKey->setEnabled(true);
             m_ui->actionChangeDatabaseSettings->setEnabled(true);
             m_ui->actionDatabaseSave->setEnabled(true);

src/gui/MainWindow.ui

@@ -162,7 +162,7 @@
      <x>0</x>
      <y>0</y>
      <width>800</width>
-     <height>29</height>
+     <height>21</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">
@@ -235,8 +235,10 @@
      <string>&amp;Groups</string>
     </property>
     <addaction name="actionGroupNew"/>
+    <addaction name="separator"/>
     <addaction name="actionGroupEdit"/>
     <addaction name="actionGroupDelete"/>
+    <addaction name="actionGroupEmptyTrash"/>
    </widget>
    <widget class="QMenu" name="menuTools">
     <property name="title">
@@ -521,6 +523,14 @@
     <string>Re&amp;pair database</string>
    </property>
   </action>
+  <action name="actionGroupEmptyTrash">
+   <property name="text">
+    <string>Empty recycle bin</string>
+   </property>
+   <property name="visible">
+    <bool>false</bool>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>