[layout] Add context menu entries for cutting/copying, and pasting items

Fixes #1830

python/gui/layout/qgslayoutview.sip

@@ -205,9 +205,17 @@ class QgsLayoutView: QGraphicsView
  A list of pasted items is returned.
 
 .. seealso:: copySelectedItems()
+.. seealso:: hasItemsInClipboard()
  :rtype: list of QgsLayoutItem
 %End
 
+    bool hasItemsInClipboard() const;
+%Docstring
+ Returns true if the current clipboard contains layout items.
+.. seealso:: pasteItems()
+ :rtype: bool
+%End
+
     QPointF deltaForKeyEvent( QKeyEvent *event );
 %Docstring
  Returns the delta (in layout coordinates) by which to move items

src/app/layout/qgslayoutappmenuprovider.cpp

@@ -76,6 +76,30 @@ QMenu *QgsLayoutAppMenuProvider::createContextMenu( QWidget *parent, QgsLayout *
 
     if ( addedGroupAction )
       menu->addSeparator();
+
+    QAction *copyAction = new QAction( tr( "Copy" ), menu );
+    connect( copyAction, &QAction::triggered, this, [this]()
+    {
+      mDesigner->view()->copySelectedItems( QgsLayoutView::ClipboardCopy );
+    } );
+    menu->addAction( copyAction );
+    QAction *cutAction = new QAction( tr( "Cut" ), menu );
+    connect( cutAction, &QAction::triggered, this, [this]()
+    {
+      mDesigner->view()->copySelectedItems( QgsLayoutView::ClipboardCut );
+    } );
+    menu->addAction( cutAction );
+    menu->addSeparator();
+  }
+  else if ( mDesigner->view()->hasItemsInClipboard() )
+  {
+    QAction *pasteAction = new QAction( tr( "Paste" ), menu );
+    connect( pasteAction, &QAction::triggered, this, [this]()
+    {
+      mDesigner->paste();
+    } );
+    menu->addAction( pasteAction );
+    menu->addSeparator();
   }
 
   // is a page under the mouse?

src/app/layout/qgslayoutdesignerdialog.h

@@ -216,6 +216,18 @@ class QgsLayoutDesignerDialog: public QMainWindow, private Ui::QgsLayoutDesigner
      */
     void refreshLayout();
 
+    /**
+     * Pastes items from the clipboard to the current layout.
+     * \see pasteInPlace()
+     */
+    void paste();
+
+    /**
+     * Pastes item (in place) from the clipboard to the current layout.
+     * \see paste()
+     */
+    void pasteInPlace();
+
   signals:
 
     /**
@@ -247,9 +259,6 @@ class QgsLayoutDesignerDialog: public QMainWindow, private Ui::QgsLayoutDesigner
     void dockVisibilityChanged( bool visible );
     void undoRedoOccurredForItems( const QSet< QString > itemUuids );
 
-    void paste();
-    void pasteInPlace();
-
   private:
 
     static bool sInitializedRegistry;

src/gui/layout/qgslayoutview.cpp

@@ -365,6 +365,19 @@ QList< QgsLayoutItem * > QgsLayoutView::pasteItems( QgsLayoutView::PasteMode mod
   return pastedItems;
 }
 
+bool QgsLayoutView::hasItemsInClipboard() const
+{
+  QDomDocument doc;
+  QClipboard *clipboard = QApplication::clipboard();
+  if ( doc.setContent( clipboard->mimeData()->data( QStringLiteral( "text/xml" ) ) ) )
+  {
+    QDomElement docElem = doc.documentElement();
+    if ( docElem.tagName() == QLatin1String( "LayoutItemClipboard" ) )
+      return true;
+  }
+  return false;
+}
+
 QPointF QgsLayoutView::deltaForKeyEvent( QKeyEvent *event )
 {
   // increment used for cursor key item movement

src/gui/layout/qgslayoutview.h

@@ -235,9 +235,16 @@ class GUI_EXPORT QgsLayoutView: public QGraphicsView
      * A list of pasted items is returned.
      *
      * \see copySelectedItems()
+     * \see hasItemsInClipboard()
      */
     QList< QgsLayoutItem * > pasteItems( PasteMode mode );
 
+    /**
+     * Returns true if the current clipboard contains layout items.
+     * \see pasteItems()
+     */
+    bool hasItemsInClipboard() const;
+
     /**
      * Returns the delta (in layout coordinates) by which to move items
      * for the given key \a event.

tests/src/python/test_qgslayoutview.py

@@ -23,8 +23,9 @@ from qgis.core import (QgsProject,
                        QgsLayoutSize,
                        QgsLayoutAligner)
 from qgis.gui import QgsLayoutView
-from qgis.PyQt.QtCore import QRectF
+from qgis.PyQt.QtCore import QRectF, QMimeData, QByteArray
 from qgis.PyQt.QtGui import QTransform
+from qgis.PyQt.QtWidgets import QApplication
 from qgis.PyQt.QtTest import QSignalSpy
 
 from qgis.testing import start_app, unittest
@@ -639,6 +640,12 @@ class TestQgsLayoutView(unittest.TestCase):
         p = QgsProject()
         l = QgsLayout(p)
 
+        # clear clipboard
+        mime_data = QMimeData()
+        mime_data.setData("text/xml", QByteArray())
+        clipboard = QApplication.clipboard()
+        clipboard.setMimeData(mime_data)
+
         # add an item
         item1 = QgsLayoutItemLabel(l)
         item1.setText('label 1')
@@ -651,8 +658,11 @@ class TestQgsLayoutView(unittest.TestCase):
 
         view = QgsLayoutView()
         view.setCurrentLayout(l)
+        self.assertFalse(view.hasItemsInClipboard())
 
         view.copySelectedItems(QgsLayoutView.ClipboardCopy)
+        self.assertTrue(view.hasItemsInClipboard())
+
         pasted = view.pasteItems(QgsLayoutView.PasteModeCursor)
         self.assertEqual(len(pasted), 2)
         self.assertIn(pasted[0], l.items())
@@ -664,6 +674,12 @@ class TestQgsLayoutView(unittest.TestCase):
         p = QgsProject()
         l = QgsLayout(p)
 
+        # clear clipboard
+        mime_data = QMimeData()
+        mime_data.setData("text/xml", QByteArray())
+        clipboard = QApplication.clipboard()
+        clipboard.setMimeData(mime_data)
+
         # add an item
         item1 = QgsLayoutItemLabel(l)
         item1.setText('label 1')
@@ -676,9 +692,11 @@ class TestQgsLayoutView(unittest.TestCase):
 
         view = QgsLayoutView()
         view.setCurrentLayout(l)
+        self.assertFalse(view.hasItemsInClipboard())
 
         len_before = len(l.items())
         view.copySelectedItems(QgsLayoutView.ClipboardCut)
+        self.assertTrue(view.hasItemsInClipboard())
         self.assertEqual(len(l.items()), len_before - 2)
 
         pasted = view.pasteItems(QgsLayoutView.PasteModeCursor)