Add "Clear all" button to security tab

Button allows to clear all permission selection
(except inherited permissions).

src/admc/permission_control_widgets/permissions_widget.cpp

@@ -203,6 +203,26 @@ void PermissionsWidget::update_permissions() {
     ignore_item_changed_signal = false;
 }
 
+bool PermissionsWidget::there_are_selected_permissions() const {
+    for (int row = 0; row < rights_model->rowCount(); ++row) {
+        const QList<PermissionColumn> columns = {PermissionColumn_Allowed, PermissionColumn_Denied};
+        for (PermissionColumn col : columns) {
+            const QModelIndex index = rights_model->index(row, col);
+            if (!index.isValid()) {
+                continue;
+            }
+
+            QStandardItem *item = rights_model->itemFromIndex(index);
+            const bool checked = item->checkState() == Qt::Checked && item->isEnabled();
+            if (checked) {
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
 void PermissionsWidget::make_model_rights_read_only() {
     // NOTE: important to ignore this signal because
     // it's slot reloads the rights model

src/admc/permission_control_widgets/permissions_widget.h

@@ -76,6 +76,7 @@ public:
     virtual void update_permissions(AppliedObjects applied_objs, const QString &appliable_child_class = QString());
     // Updates permissions with current applied objects value
     virtual void update_permissions();
+    bool there_are_selected_permissions() const;
 
 signals:
     void edited();

src/admc/tabs/security_tab.cpp

@@ -60,7 +60,13 @@ SecurityTab::SecurityTab(QList<AttributeEdit *> *edit_list, QWidget *parent)
     permissions_widgets.append(ui->read_write_permissions_widget);
     permissions_widgets.append(ui->delegation_widget);
     for (PermissionsWidget *widget : permissions_widgets) {
-        connect(widget, &PermissionsWidget::edited, tab_edit, &SecurityTabEdit::edited);
+        connect(widget, &PermissionsWidget::edited,
+                [this, widget](){
+                    tab_edit->edited();
+                    if ((!ui->clear_all_button->isEnabled() && widget->there_are_selected_permissions())) {
+                        ui->clear_all_button->setEnabled(true);
+                    }
+        });
     }
 
     const QHash<QWidget*, PermissionsWidget*> tab_permission_wget_map = {
@@ -87,9 +93,15 @@ SecurityTab::SecurityTab(QList<AttributeEdit *> *edit_list, QWidget *parent)
             if (current_trustee.isEmpty()) {
                 return;
             }
+            bool clear_enabled = false;
             for (PermissionsWidget *widget : permissions_widgets) {
                 widget->set_current_trustee(current_trustee);
+
+                if (widget->there_are_selected_permissions()) {
+                    clear_enabled = true;
                 }
+            }
+            ui->clear_all_button->setEnabled(clear_enabled);
     });
 
     connect(
@@ -105,6 +117,9 @@ SecurityTab::SecurityTab(QList<AttributeEdit *> *edit_list, QWidget *parent)
     connect(
         ui->applied_objects_cmbBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
         this, &SecurityTab::on_applied_objs_cmbbox);
+    connect(
+        ui->clear_all_button, &QAbstractButton::clicked,
+        this, &SecurityTab::on_clear_all);
 }
 
 void SecurityTab::load(AdInterface &ad, const AdObject &object) {
@@ -277,6 +292,23 @@ void SecurityTab::on_applied_objs_cmbbox() {
     }
 }
 
+void SecurityTab::on_clear_all() {
+    const QByteArray trustee = get_current_trustee();
+    if (trustee.isEmpty()) {
+        return;
+    }
+
+    // Do not reload sd to leave permission selection enabled for
+    // trustee removed from security descriptor.
+    security_descriptor_remove_trustee(sd, {trustee});
+    for (PermissionsWidget* perm_wget : permissions_widgets) {
+       perm_wget->update_permissions();
+    }
+
+    tab_edit->edited();
+    ui->clear_all_button->setDisabled(true);
+}
+
 void SecurityTabEdit::load(AdInterface &ad, const AdObject &object) {
     security_tab->load(ad, object);
 }

src/admc/tabs/security_tab.h

@@ -71,6 +71,7 @@ private:
     QByteArray get_current_trustee() const;
     void load_applied_objects_cmbbox(const QStringList &target_class_list);
     void on_applied_objs_cmbbox();
+    void on_clear_all();
 
 signals:
     void current_trustee_changed(const QByteArray &current_trustee);

src/admc/tabs/security_tab.ui

@@ -122,6 +122,16 @@
        </property>
       </spacer>
      </item>
+     <item>
+      <widget class="QPushButton" name="clear_all_button">
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+       <property name="text">
+        <string>Clear all</string>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item>
@@ -133,7 +143,7 @@
       </sizepolicy>
      </property>
      <property name="currentIndex">
-      <number>3</number>
+      <number>0</number>
      </property>
      <property name="tabBarAutoHide">
       <bool>false</bool>