QLineEdit: Add an inputRejected() signal for when a key is not allowed

[ChangeLog][QtWidgets][QLineEdit] Added inputRejected() signal for when
a key press is not accepted by the QLineEdit. For instance, when an
invalid key is pressed for a validator set.

Task-number: QTBUG-57448
Change-Id: I39182a78b07b37c6da01905b8da4c57930e3454b
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/widgets/widgets/qwidgetlinecontrol.cpp b/src/widgets/widgets/qwidgetlinecontrol.cpp
index ff00e26683..670735df3b 100644
--- a/src/widgets/widgets/qwidgetlinecontrol.cpp
+++ b/src/widgets/widgets/qwidgetlinecontrol.cpp
@@ -715,6 +715,8 @@ bool QWidgetLineControl::finishChange(int validateFromState, bool update, bool e
                     return true;
                 }
                 m_cursor = cursorCopy;
+            } else {
+                emit inputRejected();
             }
         }
 #endif
@@ -762,6 +764,8 @@ void QWidgetLineControl::internalSetText(const QString &txt, int pos, bool edite
     if (m_maskData) {
         m_text = maskString(0, txt, true);
         m_text += clearString(m_text.length(), m_maxLength - m_text.length());
+        if (edited && oldText == m_text)
+            emit inputRejected();
     } else {
         m_text = txt.isEmpty() ? txt : txt.left(m_maxLength);
     }
@@ -839,6 +843,8 @@ void QWidgetLineControl::internalInsert(const QString &s)
         addCommand(Command(SetSelection, m_cursor, 0, m_selstart, m_selend));
     if (m_maskData) {
         QString ms = maskString(m_cursor, s);
+        if (ms.isEmpty() && !s.isEmpty())
+            emit inputRejected();
 #ifndef QT_NO_ACCESSIBILITY
         QAccessibleTextInsertEvent insertEvent(accessibleObject(), m_cursor, ms);
         QAccessible::updateAccessibility(&insertEvent);
@@ -866,6 +872,8 @@ void QWidgetLineControl::internalInsert(const QString &s)
             for (int i = 0; i < (int) s.left(remaining).length(); ++i)
                addCommand(Command(Insert, m_cursor++, s.at(i), -1, -1));
             m_textDirty = true;
+        } else {
+            emit inputRejected();
         }
     }
 }