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, 40 insertions, 1 deletions

diff --git a/tests/auto/widgets/widgets/qlineedit/tst_qlineedit.cpp b/tests/auto/widgets/widgets/qlineedit/tst_qlineedit.cpp
index 7eb739611a..6e472bff02 100644
--- a/tests/auto/widgets/widgets/qlineedit/tst_qlineedit.cpp
+++ b/tests/auto/widgets/widgets/qlineedit/tst_qlineedit.cpp
@@ -304,7 +304,7 @@ private slots:
     void QTBUG59957_clearButtonLeftmostAction();
     void QTBUG_60319_setInputMaskCheckImSurroundingText();
     void testQuickSelectionWithMouse();
-
+    void inputRejected();
 protected slots:
     void editingFinished();
 
@@ -4820,5 +4820,44 @@ void tst_QLineEdit::testQuickSelectionWithMouse()
     QVERIFY(lineEdit.selectedText().endsWith(suffix));
 }
 
+void tst_QLineEdit::inputRejected()
+{
+    QLineEdit *testWidget = ensureTestWidget();
+    QSignalSpy spyInputRejected(testWidget, SIGNAL(inputRejected()));
+
+    QTest::keyClicks(testWidget, "abcde");
+    QCOMPARE(spyInputRejected.count(), 0);
+    testWidget->setText("fghij");
+    QCOMPARE(spyInputRejected.count(), 0);
+    testWidget->insert("k");
+    QCOMPARE(spyInputRejected.count(), 0);
+
+    testWidget->clear();
+    testWidget->setMaxLength(5);
+    QTest::keyClicks(testWidget, "abcde");
+    QCOMPARE(spyInputRejected.count(), 0);
+    QTest::keyClicks(testWidget, "fgh");
+    QCOMPARE(spyInputRejected.count(), 3);
+
+    testWidget->setMaxLength(INT_MAX);
+    testWidget->clear();
+    spyInputRejected.clear();
+    QIntValidator intValidator(1, 100);
+    testWidget->setValidator(&intValidator);
+    QTest::keyClicks(testWidget, "11");
+    QCOMPARE(spyInputRejected.count(), 0);
+    QTest::keyClicks(testWidget, "a#");
+    QCOMPARE(spyInputRejected.count(), 2);
+
+    testWidget->clear();
+    testWidget->setValidator(0);
+    spyInputRejected.clear();
+    testWidget->setInputMask("999.999.999.999;_");
+    QTest::keyClicks(testWidget, "11");
+    QCOMPARE(spyInputRejected.count(), 0);
+    QTest::keyClicks(testWidget, "a#");
+    QCOMPARE(spyInputRejected.count(), 2);
+}
+
 QTEST_MAIN(tst_QLineEdit)
 #include "tst_qlineedit.moc"