File indexing completed on 2024-04-28 04:21:18

 // SPDX-FileCopyrightText: 2014-2020 The KPhotoAlbum Development Team
 // SPDX-FileCopyrightText: 2022 Johannes Zarl-Zierl <johannes@zarl-zierl.at>
 //
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "CategoriesGroupsWidget.h"
 
 // Qt includes
 #include <QDropEvent>
 
 // Local includes
 #include "TagGroupsPage.h"
 
 #include <DB/Category.h>
 
 Settings::CategoriesGroupsWidget::CategoriesGroupsWidget(QWidget *parent)
     : QTreeWidget(parent)
     , m_backgroundHiglightTarget(Qt::lightGray)
 {
     setDragEnabled(true);
     setAcceptDrops(true);
 
     m_tagGroupsPage = dynamic_cast<TagGroupsPage *>(parentWidget());
 }
 
 Settings::CategoriesGroupsWidget::~CategoriesGroupsWidget()
 {
 }
 
 void Settings::CategoriesGroupsWidget::mousePressEvent(QMouseEvent *event)
 {
     m_draggedItem = itemAt(event->pos());
 
     if (m_draggedItem != nullptr) {
         if (m_draggedItem->parent() != nullptr) {
             m_draggedItemCategory = m_tagGroupsPage->getCategory(m_draggedItem);
         }
     } else {
         m_draggedItemCategory = QString();
     }
 
     QTreeWidget::mousePressEvent(event);
 }
 
 void Settings::CategoriesGroupsWidget::dragMoveEvent(QDragMoveEvent *event)
 {
     QTreeWidgetItem *target = itemAt(event->pos());
 
     if (target == nullptr) {
         // We don't have a target, so we don't allow a drop.
         event->setDropAction(Qt::IgnoreAction);
     } else {
         // The target has to be in the same category as the dragged group.
         QTreeWidgetItem *parent = target;
         // the category is the root item:
         while (parent->parent() != nullptr) {
             parent = parent->parent();
             if (parent == m_draggedItem) {
                 event->setDropAction(Qt::IgnoreAction);
                 return;
             }
         }
         if (parent->text(0) != m_draggedItemCategory) {
             event->setDropAction(Qt::IgnoreAction);
         } else {
             updateHighlight(target);
             event->setDropAction(Qt::MoveAction);
             event->accept();
         }
     }
 }
 
 void Settings::CategoriesGroupsWidget::updateHighlight(QTreeWidgetItem *target)
 {
     Q_ASSERT(target != nullptr);
     if (target == m_oldTarget) {
         return;
     }
 
     if (m_oldTarget != nullptr) {
         m_oldTarget->setBackground(0, m_backgroundNoTarget);
     }
 
     m_backgroundNoTarget = target->background(0);
     target->setBackground(0, m_backgroundHiglightTarget);
 
     m_oldTarget = target;
 }
 
 void Settings::CategoriesGroupsWidget::dropEvent(QDropEvent *event)
 {
     QTreeWidgetItem *target = itemAt(event->pos());
     target->setBackground(0, m_backgroundNoTarget);
     m_oldTarget = nullptr;
 
     if (m_draggedItem != target) {
         m_tagGroupsPage->processDrop(m_draggedItem, target);
     }
 }
 
 // vi:expandtab:tabstop=4 shiftwidth=4:
 
 #include "moc_CategoriesGroupsWidget.cpp"