qt: Add GUIUtil::ShowModalDialogAndDeleteOnClose

src/qt/guiutil.cpp

@@ -36,6 +36,7 @@
 #include <QClipboard>
 #include <QDateTime>
 #include <QDesktopServices>
+#include <QDialog>
 #include <QDoubleValidator>
 #include <QFileDialog>
 #include <QFont>
@@ -958,4 +959,11 @@ void PrintSlotException(
     PrintExceptionContinue(exception, description.c_str());
 }
 
+void ShowModalDialogAndDeleteOnClose(QDialog* dialog)
+{
+    dialog->setAttribute(Qt::WA_DeleteOnClose);
+    dialog->setWindowModality(Qt::ApplicationModal);
+    dialog->show();
+}
+
 } // namespace GUIUtil

src/qt/guiutil.h

@@ -41,6 +41,7 @@ class QAbstractButton;
 class QAbstractItemView;
 class QAction;
 class QDateTime;
+class QDialog;
 class QFont;
 class QKeySequence;
 class QLineEdit;
@@ -417,6 +418,11 @@ namespace GUIUtil
             type);
     }
 
+    /**
+     * Shows a QDialog instance asynchronously, and deletes it on close.
+     */
+    void ShowModalDialogAndDeleteOnClose(QDialog* dialog);
+
 } // namespace GUIUtil
 
 #endif // BITCOIN_QT_GUIUTIL_H