QtWidgets/D&D/dropsite example: Add copy functionality

Add a slot copying the QMimeData contents as text.

Task-number: QTBUG-60635
Change-Id: Ided14fccd8a49029ff1aff64969454ed2232dbeb
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

3 files changed, 29 insertions, 6 deletions

diff --git a/examples/widgets/doc/dropsite.qdoc b/examples/widgets/doc/dropsite.qdoc
index af8766a308..d8d09612f6 100644
--- a/examples/widgets/doc/dropsite.qdoc
+++ b/examples/widgets/doc/dropsite.qdoc
@@ -176,16 +176,16 @@
 
     \snippet draganddrop/dropsite/dropsitewindow.cpp constructor part3
 
-    Two QPushButton objects, \c clearButton and \c quitButton, are instantiated
-    and added to \c buttonBox - a QDialogButtonBox object. We use
-    QDialogButtonBox here to ensure that the push buttons are presented in a
+    Three QPushButton objects, \c clearButton, \c copyButton, and \c quitButton,
+    are instantiated and added to \c buttonBox - a QDialogButtonBox object. We
+    use QDialogButtonBox here to ensure that the push buttons are presented in a
     layout that conforms to the platform's style.
 
     \snippet draganddrop/dropsite/dropsitewindow.cpp constructor part4
 
-    The \l{QPushButton::clicked()}{clicked()} signals for \c quitButton and
-    \c clearButton are connected to \l{QWidget::close()}{close()} and
-    \c clear(), respectively.
+    The \l{QPushButton::clicked()}{clicked()} signals for \c copyButton,
+    \c clearButton, and \c quitButton are connected to \c copy(),
+    \c clear() and \l{QWidget::close()}{close()}, respectively.
 
     For the layout, we use a QVBoxLayout, \c mainLayout, to arrange our widgets
     vertically. We also set the window title to "Drop Site" and the minimum
diff --git a/examples/widgets/draganddrop/dropsite/dropsitewindow.cpp b/examples/widgets/draganddrop/dropsite/dropsitewindow.cpp
index 2dae83bb22..a937e24a4c 100644
--- a/examples/widgets/draganddrop/dropsite/dropsitewindow.cpp
+++ b/examples/widgets/draganddrop/dropsite/dropsitewindow.cpp
@@ -82,14 +82,21 @@ DropSiteWindow::DropSiteWindow()
 
 //! [constructor part4]
     clearButton = new QPushButton(tr("Clear"));
+    copyButton = new QPushButton(tr("Copy"));
     quitButton = new QPushButton(tr("Quit"));
 
     buttonBox = new QDialogButtonBox;
     buttonBox->addButton(clearButton, QDialogButtonBox::ActionRole);
+    buttonBox->addButton(copyButton, QDialogButtonBox::ActionRole);
+#if !QT_CONFIG(clipboard)
+    copyButton->setVisible(false);
+#endif
+
     buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
 
     connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
     connect(clearButton, &QAbstractButton::clicked, dropArea, &DropArea::clear);
+    connect(copyButton, &QAbstractButton::clicked, this, &DropSiteWindow::copy);
 //! [constructor part4]
 
 //! [constructor part5]
@@ -108,6 +115,7 @@ DropSiteWindow::DropSiteWindow()
 void DropSiteWindow::updateFormatsTable(const QMimeData *mimeData)
 {
     formatsTable->setRowCount(0);
+    copyButton->setEnabled(false);
     if (!mimeData)
         return;
 //! [updateFormatsTable() part1]
@@ -145,5 +153,18 @@ void DropSiteWindow::updateFormatsTable(const QMimeData *mimeData)
     }
 
     formatsTable->resizeColumnToContents(0);
+#if QT_CONFIG(clipboard)
+    copyButton->setEnabled(formatsTable->rowCount() > 0);
+#endif
 }
 //! [updateFormatsTable() part4]
+
+void DropSiteWindow::copy()
+{
+#if QT_CONFIG(clipboard)
+    QString text;
+    for (int row = 0, rowCount = formatsTable->rowCount(); row < rowCount; ++row)
+        text += formatsTable->item(row, 0)->text() + ": " + formatsTable->item(row, 1)->text() + '\n';
+    QGuiApplication::clipboard()->setText(text);
+#endif
+}
diff --git a/examples/widgets/draganddrop/dropsite/dropsitewindow.h b/examples/widgets/draganddrop/dropsite/dropsitewindow.h
index d80476f369..a40b481637 100644
--- a/examples/widgets/draganddrop/dropsite/dropsitewindow.h
+++ b/examples/widgets/draganddrop/dropsite/dropsitewindow.h
@@ -72,6 +72,7 @@ public:
 
 public slots:
     void updateFormatsTable(const QMimeData *mimeData);
+    void copy();
 
 private:
     DropArea *dropArea;
@@ -79,6 +80,7 @@ private:
     QTableWidget *formatsTable;
 
     QPushButton *clearButton;
+    QPushButton *copyButton;
     QPushButton *quitButton;
     QDialogButtonBox *buttonBox;
 };