gui: Add GUIUtil::ItemDelegate with keyEscapePressed signal

src/qt/guiutil.cpp

@@ -49,6 +49,7 @@
 #include <QDoubleValidator>
 #include <QFileDialog>
 #include <QFont>
+#include <QKeyEvent>
 #include <QLineEdit>
 #include <QSettings>
 #include <QTextDocument> // for Qt::mightBeRichText
@@ -927,4 +928,14 @@ void ClickableProgressBar::mouseReleaseEvent(QMouseEvent *event)
     Q_EMIT clicked(event->pos());
 }
 
+bool ItemDelegate::eventFilter(QObject *object, QEvent *event)
+{
+    if (event->type() == QEvent::KeyPress) {
+        if (static_cast<QKeyEvent*>(event)->key() == Qt::Key_Escape) {
+            Q_EMIT keyEscapePressed();
+        }
+    }
+    return QItemDelegate::eventFilter(object, event);
+}
+
 } // namespace GUIUtil