Delay masking the last character in Password echo mode.

If QT_GUI_PASSWORD_ECHO_DELAY is defined in qplatformdefs.h with an
integer value in milliseconds, QLineEdit and TextInput will display
the last character entered unmasked for that delay period and then
mask the character as normal.  If QT_GUI_PASSWORD_ECHO_DELAY is
not defined then the behaviour is unchanged.

Change-Id: I55f527932d34453828caba88e93ad57e012e79be
Task-number: QTBUG-17003
Reviewed-by: Martin Jones

1 files changed, 51 insertions, 0 deletions

diff --git a/tests/auto/qlineedit/tst_qlineedit.cpp b/tests/auto/qlineedit/tst_qlineedit.cpp
index 9f4d158..1f33458 100644
--- a/tests/auto/qlineedit/tst_qlineedit.cpp
+++ b/tests/auto/qlineedit/tst_qlineedit.cpp
@@ -72,6 +72,8 @@
 #include "qcommonstyle.h"
 #include "qstyleoption.h"
 
+#include "qplatformdefs.h"
+
 QT_BEGIN_NAMESPACE
 class QPainter;
 QT_END_NAMESPACE
@@ -180,6 +182,10 @@ private slots:
     void echoMode();
     void passwordEchoOnEdit();
 
+#ifdef QT_GUI_PASSWORD_ECHO_DELAY
+    void passwordEchoDelay();
+#endif
+
     void maxLength_mask_data();
     void maxLength_mask();
 
@@ -1718,6 +1724,51 @@ void tst_QLineEdit::passwordEchoOnEdit()
     testWidget->setEchoMode(QLineEdit::Normal);
 }
 
+#ifdef QT_GUI_PASSWORD_ECHO_DELAY
+void tst_QLineEdit::passwordEchoDelay()
+{
+    QStyleOptionFrameV2 opt;
+    QChar fillChar = testWidget->style()->styleHint(QStyle::SH_LineEdit_PasswordCharacter, &opt, testWidget);
+
+    testWidget->setEchoMode(QLineEdit::Password);
+    testWidget->setFocus();
+    testWidget->raise();
+    QTRY_VERIFY(testWidget->hasFocus());
+
+    QTest::keyPress(testWidget, '0');
+    QTest::keyPress(testWidget, '1');
+    QTest::keyPress(testWidget, '2');
+    QCOMPARE(testWidget->displayText(), QString(2, fillChar) + QLatin1Char('2'));
+    QTest::keyPress(testWidget, '3');
+    QTest::keyPress(testWidget, '4');
+    QCOMPARE(testWidget->displayText(), QString(4, fillChar) + QLatin1Char('4'));
+    QTest::keyPress(testWidget, Qt::Key_Backspace);
+    QCOMPARE(testWidget->displayText(), QString(4, fillChar));
+    QTest::keyPress(testWidget, '4');
+    QCOMPARE(testWidget->displayText(), QString(4, fillChar) + QLatin1Char('4'));
+    QTest::qWait(QT_GUI_PASSWORD_ECHO_DELAY);
+    QTRY_COMPARE(testWidget->displayText(), QString(5, fillChar));
+    QTest::keyPress(testWidget, '5');
+    QCOMPARE(testWidget->displayText(), QString(5, fillChar) + QLatin1Char('5'));
+    testWidget->clearFocus();
+    QVERIFY(!testWidget->hasFocus());
+    QCOMPARE(testWidget->displayText(), QString(6, fillChar));
+    testWidget->setFocus();
+    QTRY_VERIFY(testWidget->hasFocus());
+    QCOMPARE(testWidget->displayText(), QString(6, fillChar));
+    QTest::keyPress(testWidget, '6');
+    QCOMPARE(testWidget->displayText(), QString(6, fillChar) + QLatin1Char('6'));
+
+    QInputMethodEvent ev;
+    ev.setCommitString(QLatin1String("7"));
+    QApplication::sendEvent(testWidget, &ev);
+    QCOMPARE(testWidget->displayText(), QString(7, fillChar) + QLatin1Char('7'));
+
+    // restore clean state
+    testWidget->setEchoMode(QLineEdit::Normal);
+}
+#endif
+
 void tst_QLineEdit::maxLength_mask_data()
 {
     QTest::addColumn<QString>("mask");