Refactor attachment handling system with enhanced UI (#12085)

* Renamed NewEntryAttachmentsDialog to EditEntryAttachmentsDialog for clarity.
* Introduced EditEntryAttachmentsDialog class to manage editing of existing attachments.
* Added functionality to preview attachments while editing them.
* Enhanced EntryAttachmentsModel with rowByKey method for better key management.
* Add image attachment support with zoom functionality.
* Add html and markdown detection.
* Improve button layout on the attachment section when editing an entry

src/gui/entry/attachments/ImageAttachmentsView.cpp

@@ -0,0 +1,98 @@
+/*
+ *  Copyright (C) 2025 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ImageAttachmentsView.h"
+
+#include <QDebug>
+#include <QWheelEvent>
+
+#include <limits>
+
+ImageAttachmentsView::ImageAttachmentsView(QWidget* parent)
+    : QGraphicsView(parent)
+{
+}
+
+void ImageAttachmentsView::wheelEvent(QWheelEvent* event)
+{
+    if (event->modifiers() == Qt::ControlModifier) {
+        emit ctrlWheelEvent(event);
+        return;
+    }
+
+    QGraphicsView::wheelEvent(event);
+}
+
+void ImageAttachmentsView::resizeEvent(QResizeEvent* event)
+{
+    QGraphicsView::resizeEvent(event);
+
+    if (m_autoFitInView) {
+        fitSceneInView();
+    }
+}
+
+void ImageAttachmentsView::showEvent(QShowEvent* event)
+{
+    if (m_autoFitInView) {
+        fitSceneInView();
+    }
+
+    QGraphicsView::showEvent(event);
+}
+
+void ImageAttachmentsView::fitSceneInView()
+{
+    if (auto scene = ImageAttachmentsView::scene()) {
+        ImageAttachmentsView::fitInView(scene->itemsBoundingRect(), Qt::KeepAspectRatio);
+    }
+}
+
+void ImageAttachmentsView::enableAutoFitInView()
+{
+    m_autoFitInView = true;
+    fitSceneInView();
+}
+
+void ImageAttachmentsView::disableAutoFitInView()
+{
+    m_autoFitInView = false;
+}
+
+bool ImageAttachmentsView::isAutoFitInViewActivated() const
+{
+    return m_autoFitInView;
+}
+
+double ImageAttachmentsView::calculateFitInViewFactor() const
+{
+    auto viewPort = viewport();
+    if (auto currentScene = scene(); currentScene && viewPort) {
+        const auto itemsRect = currentScene->itemsBoundingRect().size();
+
+        // If the image rect is empty
+        if (itemsRect.isEmpty()) {
+            return std::numeric_limits<double>::quiet_NaN();
+        }
+
+        const auto viewPortSize = viewPort->size();
+        // Calculate the zoom factor based on the current size and the image rect
+        return std::min(viewPortSize.width() / itemsRect.width(), viewPortSize.height() / itemsRect.height());
+    }
+
+    return std::numeric_limits<double>::quiet_NaN();
+}