Fix issue with drag pixmap.

It disappears if move cursor far enough. Instead draw a cursor which will include a piece pixmap.

src/app/puzzle/main.cpp

@@ -58,6 +58,7 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(schema);
     Q_INIT_RESOURCE(flags);
     Q_INIT_RESOURCE(style);
+    Q_INIT_RESOURCE(cursor);
 
     QT_REQUIRE_VERSION(argc, argv, "5.4.0")// clazy:exclude=qstring-arg,qstring-allocations
 

src/app/puzzle/puzzle.pro

@@ -60,6 +60,7 @@ UI_DIR = uic
 include(puzzle.pri)
 
 RESOURCES += \
+    share/resources/cursor.qrc \
     share/resources/puzzleicon.qrc
 
 include(../translations.pri)

src/app/puzzle/share/resources/cursor.qrc

@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>cursor/collect.png</file>
+        <file>cursor/collect@2x.png</file>
+    </qresource>
+</RCC>

src/app/puzzle/vpcarrouselpiecelist.cpp

@@ -139,9 +139,9 @@ void VPCarrouselPieceList::startDrag(Qt::DropActions supportedActions)
         VPPiece* piece = pieceItem->GetPiece();
         mimeData->SetPiecePtr(piece);
 
-        QPixmap pixmap = pieceItem->CreatePieceIcon(QSize(120,120), true).pixmap(QSize(120,120));
+        QPixmap pixmap = pieceItem->CreatePieceIcon(QSize(120, 120), true).pixmap(QSize(120, 120));
 
-        drag->setPixmap(pixmap);
+        drag->setDragCursor(VPMimeDataPiece::DragCursor(pixmap), Qt::MoveAction);
         drag->setMimeData(mimeData);
         if(drag->exec() == Qt::MoveAction)
         {

src/app/puzzle/vpmimedatapiece.cpp

@@ -28,6 +28,9 @@
 
 #include "vpmimedatapiece.h"
 
+#include <QPainter>
+#include <QPixmap>
+
 const QString VPMimeDataPiece::mineFormatPiecePtr = QStringLiteral("application/vnd.puzzle.piece.ptr");
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -47,3 +50,16 @@ void VPMimeDataPiece::SetPiecePtr(VPPiece* piece)
 {
     m_piece = piece;
 }
+
+//---------------------------------------------------------------------------------------------------------------------
+auto VPMimeDataPiece::DragCursor(const QPixmap &piecePixmap) -> QPixmap
+{
+    QPixmap dragCursor(piecePixmap.width()*2, piecePixmap.height()*2);
+    dragCursor.fill(Qt::transparent);
+    QPainter painter(&dragCursor);
+    painter.drawPixmap(dragCursor.width()/2, dragCursor.height()/2, piecePixmap);
+    QPixmap cursor = QPixmap("://cursor/collect.png");
+    painter.drawPixmap(dragCursor.width()/2 - cursor.width()/2, dragCursor.height()/2 - cursor.height()/2, cursor);
+    painter.end();
+    return dragCursor;
+}

src/app/puzzle/vpmimedatapiece.h

@@ -55,6 +55,8 @@ public:
      */
     void SetPiecePtr(VPPiece* piece);
 
+    static auto DragCursor(const QPixmap &piecePixmap) -> QPixmap;
+
     static const QString mineFormatPiecePtr;
 
 private: