DropHandler.cpp

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#include "ui/shell/window/DropHandler.h"
 
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QEvent>
#include <QMimeData>
 
namespace ui::window {
 
namespace {
 
QStringList droppedLocalFiles(const QMimeData* mimeData) {
  QStringList files;
  if (!mimeData || !mimeData->hasUrls())
    return files;
 
  const auto urls = mimeData->urls();
  for (const auto& url : urls) {
    const QString localFile = url.toLocalFile();
    if (!localFile.isEmpty())
      files.push_back(localFile);
  }
  return files;
}
 
} // namespace
 
DropEventOutcome DropHandler::handle(QEvent* event) const {
  if (!event)
    return {};
 
  switch (event->type()) {
    case QEvent::DragEnter: {
      auto* dragEvent = static_cast<QDragEnterEvent*>(event);
      const QStringList files = droppedLocalFiles(dragEvent->mimeData());
      if (!files.isEmpty())
        dragEvent->acceptProposedAction();
      else
        dragEvent->ignore();
      return {true, !files.isEmpty(), files};
    }
    case QEvent::DragMove: {
      auto* dragEvent = static_cast<QDragMoveEvent*>(event);
      const QStringList files = droppedLocalFiles(dragEvent->mimeData());
      if (!files.isEmpty())
        dragEvent->acceptProposedAction();
      else
        dragEvent->ignore();
      return {true, !files.isEmpty(), files};
    }
    case QEvent::Drop: {
      auto* dropEvent = static_cast<QDropEvent*>(event);
      const QStringList files = droppedLocalFiles(dropEvent->mimeData());
      if (!files.isEmpty())
        dropEvent->acceptProposedAction();
      else
        dropEvent->ignore();
      return {true, !files.isEmpty(), files};
    }
    default:
      return {};
  }
}
 
} // namespace ui::window