Added triple click on TextInput to select text.

Once it gets a double click, it'll start to monitor any other extra
click for a short duration. Once it is detected, the monitor stops
watching and all text is selected. It only works when selectByMouse
property is set, just like double click selecting current word.

Also added a test case that simulates clicking at the same point
and triggering the triple click, and another one that contemplates
movement of mouse between the second and the third click. Also test
timing between clicks.

Task-number: QTBUG-21038

Change-Id: I139f7ece2107f5dbfcba1836afb27aaa9b24fc57
Merge-request: 6
Reviewed-by: Andrew den Exter <andrew.den-exter@nokia.com>
Reviewed-on: http://codereview.qt-project.org/5761
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>

src/declarative/items/qsgtextinput.cpp

@@ -1088,6 +1088,10 @@ void QSGTextInput::mouseDoubleClickEvent(QMouseEvent *event)
         int cursor = d->xToPos(event->localPos().x());
         d->control->selectWordAtPos(cursor);
         event->setAccepted(true);
+        if (!d->hasPendingTripleClick()) {
+            d->tripleClickStartPoint = event->localPos().toPoint();
+            d->tripleClickTimer.start();
+        }
     } else {
         QSGImplicitSizeItem::mouseDoubleClickEvent(event);
     }
@@ -1116,6 +1120,13 @@ void QSGTextInput::mousePressEvent(QMouseEvent *event)
         setKeepMouseGrab(false);
         d->selectPressed = true;
         d->pressPos = event->localPos();
+        QPoint distanceVector = d->pressPos.toPoint() - d->tripleClickStartPoint;
+        if (d->hasPendingTripleClick()
+            && distanceVector.manhattanLength() < qApp->styleHints()->startDragDistance()) {
+            event->setAccepted(true);
+            selectAll();
+            return;
+        }
     }
     bool mark = (event->modifiers() & Qt::ShiftModifier) && d->selectByMouse;
     int cursor = d->xToPos(event->localPos().x());

src/declarative/items/qsgtextinput_p_p.h

@@ -50,7 +50,10 @@
 #include <private/qlinecontrol_p.h>
 
 #include <QtDeclarative/qdeclarative.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtCore/qpointer.h>
+#include <QtGui/qguiapplication.h>
+#include <QtGui/qstylehints.h>
 
 
 //
@@ -142,6 +145,8 @@ class Q_AUTOTEST_EXPORT QSGTextInputPrivate : public QSGImplicitSizeItemPrivate
     QPointer<QSGItem> cursorItem;
     QPointF pressPos;
     QSGTextNode *textNode;
+    QElapsedTimer tripleClickTimer;
+    QPoint tripleClickStartPoint;
 
     int lastSelectionStart;
     int lastSelectionEnd;
@@ -166,6 +171,9 @@ class Q_AUTOTEST_EXPORT QSGTextInputPrivate : public QSGImplicitSizeItemPrivate
     static inline QSGTextInputPrivate *get(QSGTextInput *t) {
         return t->d_func();
     }
+    bool hasPendingTripleClick() const {
+        return !tripleClickTimer.hasExpired(qApp->styleHints()->mouseDoubleClickInterval());
+    }
 };
 
 QT_END_NAMESPACE

tests/auto/declarative/qsgtextinput/tst_qsgtextinput.cpp

@@ -110,6 +110,7 @@ private slots:
     void dragMouseSelection();
     void mouseSelectionMode_data();
     void mouseSelectionMode();
+    void tripleClickSelectsAll();
 
     void horizontalAlignment_data();
     void horizontalAlignment();
@@ -2723,6 +2724,49 @@ void tst_qsgtextinput::cursorRectangleSize()
 #endif
 }
 
+void tst_qsgtextinput::tripleClickSelectsAll()
+{
+    QString qmlfile = SRCDIR "/data/positionAt.qml";
+    QSGView view(QUrl::fromLocalFile(qmlfile));
+    view.requestActivateWindow();
+    view.show();
+    QTest::qWaitForWindowShown(&view);
+
+    QEXPECT_FAIL("", QTBUG_21489_MESSAGE, Continue);
+    QTRY_COMPARE(view.windowState(), Qt::WindowActive);
+
+    QSGTextInput* input = qobject_cast<QSGTextInput*>(view.rootObject());
+    QVERIFY(input);
+
+    QLatin1String hello("Hello world!");
+    input->setSelectByMouse(true);
+    input->setText(hello);
+
+    // Clicking on the same point inside TextInput three times in a row
+    // should trigger a triple click, thus selecting all the text.
+    QPoint pointInside = input->pos().toPoint() + QPoint(2,2);
+    QTest::mouseDClick(&view, Qt::LeftButton, 0, pointInside);
+    QTest::mouseClick(&view, Qt::LeftButton, 0, pointInside);
+    QGuiApplication::processEvents();
+    QCOMPARE(input->selectedText(), hello);
+
+    // Now it simulates user moving the mouse between the second and the third click.
+    // In this situation, we don't expect a triple click.
+    QPoint pointInsideButFar = QPoint(input->width(),input->height()) - QPoint(2,2);
+    QTest::mouseDClick(&view, Qt::LeftButton, 0, pointInside);
+    QTest::mouseClick(&view, Qt::LeftButton, 0, pointInsideButFar);
+    QGuiApplication::processEvents();
+    QVERIFY(input->selectedText().isEmpty());
+
+    // And now we press the third click too late, so no triple click event is triggered.
+    QTest::mouseDClick(&view, Qt::LeftButton, 0, pointInside);
+    QGuiApplication::processEvents();
+    QTest::qWait(QApplication::doubleClickInterval() + 1);
+    QTest::mouseClick(&view, Qt::LeftButton, 0, pointInside);
+    QGuiApplication::processEvents();
+    QVERIFY(input->selectedText().isEmpty());
+}
+
 QTEST_MAIN(tst_qsgtextinput)
 
 #include "tst_qsgtextinput.moc"