Drag and Drop Images

Now that we have the possibility to add images without meaningful
time stamps to a dive, we should let the user provide that time
offset manually. This patch allowed pictures to be dragged from
the image list to the profile.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/divepicturewidget.cpp

@@ -14,6 +14,7 @@
 #include <mainwindow.h>
 #include <qthelper.h>
 #include <QStandardPaths>
+#include <QtWidgets>
 
 DivePictureWidget::DivePictureWidget(QWidget *parent) : QListView(parent)
 {
@@ -25,3 +26,32 @@ void DivePictureWidget::doubleClicked(const QModelIndex &index)
 	QString filePath = model()->data(index, Qt::DisplayPropertyRole).toString();
 	emit photoDoubleClicked(localFilePath(filePath));
 }
+
+
+void DivePictureWidget::mousePressEvent(QMouseEvent *event)
+{
+
+	QPixmap pixmap = model()->data(indexAt(event->pos()), Qt::DecorationRole).value<QPixmap>();
+
+	QString filename = model()->data(indexAt(event->pos()), Qt::DisplayPropertyRole).toString();
+
+	QByteArray itemData;
+	QDataStream dataStream(&itemData, QIODevice::WriteOnly);
+	dataStream << filename << event->pos();
+
+	QMimeData *mimeData = new QMimeData;
+	mimeData->setData("application/x-subsurfaceimagedrop", itemData);
+
+	QDrag *drag = new QDrag(this);
+	drag->setMimeData(mimeData);
+	drag->setPixmap(pixmap);
+	drag->setHotSpot(event->pos() - rectForIndex(indexAt(event->pos())).topLeft());
+
+	QPixmap tempPixmap = pixmap;
+	QPainter painter;
+	painter.begin(&tempPixmap);
+	painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
+	painter.end();
+
+	drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
+}

desktop-widgets/divepicturewidget.h

@@ -10,6 +10,9 @@ class DivePictureWidget : public QListView {
 	Q_OBJECT
 public:
 	DivePictureWidget(QWidget *parent);
+protected:
+	void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+
 signals:
 	void photoDoubleClicked(const QString filePath);
 private

profile-widget/profilewidget2.cpp

@@ -14,6 +14,7 @@
 #include "diveplannermodel.h"
 #include "models.h"
 #include "divepicturemodel.h"
+#include "divelist.h"
 #ifndef SUBSURFACE_MOBILE
 #include "diveplanner.h"
 #include "simplewidgets.h"
@@ -33,6 +34,7 @@
 #include <QTableView>
 #endif
 #include "preferences/preferencesdialog.h"
+#include <QtWidgets>
 
 // a couple of helpers we need
 extern bool haveFilesOnCommandLine();
@@ -129,6 +131,8 @@ ProfileWidget2::ProfileWidget2(QWidget *parent) : QGraphicsView(parent),
 	scene()->installEventFilter(this);
 #ifndef SUBSURFACE_MOBILE
 	QAction *action = NULL;
+	setAcceptDrops(true);
+
 #define ADD_ACTION(SHORTCUT, Slot)                                  \
 	action = new QAction(this);                                 \
 	action->setShortcut(SHORTCUT);                              \
@@ -1874,3 +1878,65 @@ void ProfileWidget2::plotPictures()
 		pictures.push_back(item);
 	}
 }
+
+void ProfileWidget2::dropEvent(QDropEvent *event)
+{
+	if (event->mimeData()->hasFormat("application/x-subsurfaceimagedrop")) {
+		QByteArray itemData = event->mimeData()->data("application/x-subsurfaceimagedrop");
+		QDataStream dataStream(&itemData, QIODevice::ReadOnly);
+
+		QString filename;
+		QPoint offset;
+		dataStream >> filename >> offset;
+
+		QPointF mappedPos = mapToScene(event->pos());
+
+		FOR_EACH_PICTURE(current_dive) {
+			if (QString(picture->filename) == filename) {
+				picture->offset.seconds = timeAxis->valueAt(mappedPos);
+				mark_divelist_changed(true);
+				break;
+			}
+		}
+		copy_dive(current_dive, &displayed_dive);
+		DivePictureModel::instance()->updateDivePictures();
+
+
+		if (event->source() == this) {
+			event->setDropAction(Qt::MoveAction);
+			event->accept();
+		} else {
+			event->acceptProposedAction();
+		}
+	} else {
+		event->ignore();
+	}
+}
+
+void ProfileWidget2::dragEnterEvent(QDragEnterEvent *event)
+{
+	if (event->mimeData()->hasFormat("application/x-subsurfaceimagedrop")) {
+		if (event->source() == this) {
+			event->setDropAction(Qt::MoveAction);
+			event->accept();
+		} else {
+			event->acceptProposedAction();
+		}
+	} else {
+		event->ignore();
+	}
+}
+
+void ProfileWidget2::dragMoveEvent(QDragMoveEvent *event)
+{
+	if (event->mimeData()->hasFormat("application/x-subsurfaceimagedrop")) {
+		if (event->source() == this) {
+			event->setDropAction(Qt::MoveAction);
+			event->accept();
+		} else {
+			event->acceptProposedAction();
+		}
+	} else {
+		event->ignore();
+	}
+}

profile-widget/profilewidget2.h

@@ -149,6 +149,10 @@ protected:
 	virtual void mouseDoubleClickEvent(QMouseEvent *event);
 	virtual void mousePressEvent(QMouseEvent *event);
 	virtual void mouseReleaseEvent(QMouseEvent *event);
+	void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
+	void dragEnterEvent(QDragEnterEvent *event) Q_DECL_OVERRIDE;
+	void dragMoveEvent(QDragMoveEvent *event) Q_DECL_OVERRIDE;
+
 
 private: /*methods*/
 	void fixBackgroundPos();