Improved the support for input methods in Graphics View.

This patch improves the graphics view support for input
methods in several ways:

  * A new ItemAcceptsInputMethod flag is introduced to serve
    the same purpose for graphics items as WA_InputMethodEnabled
    does for widgets: Input method support can be controlled
    individually for each item.
  * The input method sensitivity of a view (i.e. the value of
    the WA_InputMethodEnabled flag) is updated dynamically
    whenever the input method support of the current focus
    item may change.
  * Input contexts are reset whenever an item that supports
    input methods loses focus.

Reviewed-by: janarve
Task-number: 254492

3 files changed, 220 insertions, 2 deletions

diff --git a/tests/auto/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp b/tests/auto/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
index 0b1d5cf9d2..dbc433914d 100644
--- a/tests/auto/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
+++ b/tests/auto/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
@@ -178,6 +178,7 @@ private slots:
     void windowFlags_data();
     void windowFlags();
     void comboboxWindowFlags();
+    void inputMethod();
 };
 
 // Subclass that exposes the protected functions.
@@ -1572,7 +1573,7 @@ void tst_QGraphicsProxyWidget::resize_simple()
 
     QGraphicsProxyWidget proxy;
     QWidget *widget = new QWidget;
-    widget->setGeometry(0, 0, size.width(), size.height());
+    widget->setGeometry(0, 0, (int)size.width(), (int)size.height());
     proxy.setWidget(widget);
     widget->show();
     QCOMPARE(widget->pos(), QPoint());
@@ -3217,10 +3218,51 @@ void tst_QGraphicsProxyWidget::comboboxWindowFlags()
     QVERIFY((static_cast<QGraphicsWidget *>(popupProxy)->windowFlags() & Qt::Popup) == Qt::Popup);
 }
 
+class InputMethod_LineEdit : public QLineEdit
+{
+    bool event(QEvent *e)
+    {
+        if (e->type() == QEvent::InputMethod)
+            ++inputMethodEvents;
+        return QLineEdit::event(e);
+    }
+public:
+    int inputMethodEvents;
+};
+
+void tst_QGraphicsProxyWidget::inputMethod()
+{
+    QGraphicsScene scene;
+
+    // check that the proxy is initialized with the correct input method sensitivity
+    for (int i = 0; i < 2; ++i)
+    {
+        QLineEdit *lineEdit = new QLineEdit;
+        lineEdit->setAttribute(Qt::WA_InputMethodEnabled, !!i);
+        QGraphicsProxyWidget *proxy = scene.addWidget(lineEdit);
+        QCOMPARE(!!(proxy->flags() & QGraphicsItem::ItemAcceptsInputMethod), !!i);
+    }
+
+    // check that input method events are only forwarded to widgets with focus
+    for (int i = 0; i < 2; ++i)
+    {
+        InputMethod_LineEdit *lineEdit = new InputMethod_LineEdit;
+        lineEdit->setAttribute(Qt::WA_InputMethodEnabled, true);
+        QGraphicsProxyWidget *proxy = scene.addWidget(lineEdit);
+
+        if (i)
+            lineEdit->setFocus();
+            
+        lineEdit->inputMethodEvents = 0;
+        QInputMethodEvent event;
+        qApp->sendEvent(proxy, &event);
+        QCOMPARE(lineEdit->inputMethodEvents, i);
+    }
+}
+
 QTEST_MAIN(tst_QGraphicsProxyWidget)
 #include "tst_qgraphicsproxywidget.moc"
 
 #else // QT_NO_STYLE_CLEANLOOKS
 QTEST_NOOP_MAIN
 #endif
-
diff --git a/tests/auto/qgraphicsscene/tst_qgraphicsscene.cpp b/tests/auto/qgraphicsscene/tst_qgraphicsscene.cpp
index 4247cca3eb..d325f0f5d3 100644
--- a/tests/auto/qgraphicsscene/tst_qgraphicsscene.cpp
+++ b/tests/auto/qgraphicsscene/tst_qgraphicsscene.cpp
@@ -252,6 +252,8 @@ private slots:
     void stickyFocus_data();
     void stickyFocus();
     void sendEvent();
+    void inputMethod_data();
+    void inputMethod();
 
     // task specific tests below me
     void task139710_bspTreeCrash();
@@ -3614,5 +3616,61 @@ void tst_QGraphicsScene::sendEvent()
     QCOMPARE(spy->count(), 1);
 }
 
+void tst_QGraphicsScene::inputMethod_data()
+{
+    QTest::addColumn<int>("flags");
+    QTest::addColumn<bool>("callFocusItem");
+    QTest::newRow("0") << 0 << false;
+    QTest::newRow("1") << (int)QGraphicsItem::ItemAcceptsInputMethod << false;
+    QTest::newRow("2") << (int)QGraphicsItem::ItemIsFocusable << false;
+    QTest::newRow("3") <<
+        (int)(QGraphicsItem::ItemAcceptsInputMethod|QGraphicsItem::ItemIsFocusable) << true;
+}
+
+class InputMethodTester : public QGraphicsRectItem
+{
+    void inputMethodEvent(QInputMethodEvent *) { ++eventCalls; }
+    QVariant inputMethodQuery(Qt::InputMethodQuery) const { ++queryCalls; return QVariant(); }
+public:
+    int eventCalls;
+    mutable int queryCalls;
+};
+
+void tst_QGraphicsScene::inputMethod()
+{
+    QFETCH(int, flags);
+    QFETCH(bool, callFocusItem);
+
+    InputMethodTester *item = new InputMethodTester;
+    item->setFlags((QGraphicsItem::GraphicsItemFlags)flags);
+
+    QGraphicsScene scene;
+    scene.addItem(item);
+    QInputMethodEvent event;
+
+    scene.setFocusItem(item);
+    QCOMPARE(!!(item->flags() & QGraphicsItem::ItemIsFocusable), scene.focusItem() == item);
+
+    item->eventCalls = 0;
+    qApp->sendEvent(&scene, &event);
+    QCOMPARE(item->eventCalls, callFocusItem ? 1 : 0);
+
+    item->queryCalls = 0;
+    scene.inputMethodQuery((Qt::InputMethodQuery)0);
+    QCOMPARE(item->queryCalls, callFocusItem ? 1 : 0);
+
+    scene.setFocusItem(0);
+    QCOMPARE(item->eventCalls, callFocusItem ? 2 : 0); // verify correct delivery of "reset" event
+    QCOMPARE(item->queryCalls, callFocusItem ? 1 : 0); // verify that value is unaffected
+
+    item->eventCalls = 0;
+    qApp->sendEvent(&scene, &event);
+    QCOMPARE(item->eventCalls, 0);
+
+    item->queryCalls = 0;
+    scene.inputMethodQuery((Qt::InputMethodQuery)0);
+    QCOMPARE(item->queryCalls, 0);
+}
+
 QTEST_MAIN(tst_QGraphicsScene)
 #include "tst_qgraphicsscene.moc"
diff --git a/tests/auto/qgraphicsview/tst_qgraphicsview.cpp b/tests/auto/qgraphicsview/tst_qgraphicsview.cpp
index d24e43712d..8b4ca4c65e 100644
--- a/tests/auto/qgraphicsview/tst_qgraphicsview.cpp
+++ b/tests/auto/qgraphicsview/tst_qgraphicsview.cpp
@@ -63,6 +63,7 @@
 #include <QtGui/QBoxLayout>
 #include <QtGui/QStyle>
 #include <QtGui/QPushButton>
+#include <QtGui/QInputContext>
 
 //TESTED_CLASS=
 //TESTED_FILES=
@@ -195,6 +196,8 @@ private slots:
     void mouseTracking2();
     void render();
     void exposeRegion();
+    void inputMethodSensitivity();
+    void inputContextReset();
 
     // task specific tests below me
     void task172231_untransformableItems();
@@ -3357,6 +3360,121 @@ void tst_QGraphicsView::exposeRegion()
     QCOMPARE(item->paints, 0);
 }
 
+void tst_QGraphicsView::inputMethodSensitivity()
+{
+    QGraphicsScene scene;
+    QGraphicsView view(&scene);
+
+    QGraphicsRectItem *item = new QGraphicsRectItem;
+
+    view.setAttribute(Qt::WA_InputMethodEnabled, true);
+
+    scene.addItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.removeItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    item->setFlag(QGraphicsItem::ItemAcceptsInputMethod);
+    scene.addItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.removeItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.addItem(item);
+    scene.setFocusItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.removeItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    item->setFlag(QGraphicsItem::ItemIsFocusable);
+    scene.addItem(item);
+    scene.setFocusItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), true);
+
+    item->setFlag(QGraphicsItem::ItemAcceptsInputMethod, false);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    item->setFlag(QGraphicsItem::ItemAcceptsInputMethod, true);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), true);
+
+    // introduce another item that is focusable but does not accept input methods
+    QGraphicsRectItem *item2 = new QGraphicsRectItem;
+    item2->setFlag(QGraphicsItem::ItemIsFocusable);
+    scene.addItem(item2);
+    scene.setFocusItem(item2);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.setFocusItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), true);
+
+    view.setScene(0);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    view.setScene(&scene);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), true);
+
+    scene.setFocusItem(item2);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    view.setScene(0);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    scene.setFocusItem(item);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), false);
+
+    view.setScene(&scene);
+    QCOMPARE(view.testAttribute(Qt::WA_InputMethodEnabled), true);
+}
+
+class InputContextTester : public QInputContext
+{
+    QString identifierName() { return QString(); }
+    bool isComposing() const { return false; }
+    QString language() { return QString(); }
+    void reset() { ++resets; }
+public:
+    int resets;
+};
+
+void tst_QGraphicsView::inputContextReset()
+{
+    QGraphicsScene scene;
+    QGraphicsView view(&scene);
+
+    InputContextTester inputContext;
+    view.setInputContext(&inputContext);
+
+    QGraphicsItem *item1 = new QGraphicsRectItem;
+    item1->setFlags(QGraphicsItem::ItemIsFocusable | QGraphicsItem::ItemAcceptsInputMethod);
+
+    inputContext.resets = 0;
+    scene.addItem(item1);
+    QCOMPARE(inputContext.resets, 0);
+
+    inputContext.resets = 0;
+    scene.setFocusItem(item1);
+    QCOMPARE(inputContext.resets, 0);
+
+    inputContext.resets = 0;
+    scene.setFocusItem(0);
+    QCOMPARE(inputContext.resets, 1);
+
+    // introduce another item that is focusable but does not accept input methods
+    QGraphicsItem *item2 = new QGraphicsRectItem;
+    item1->setFlags(QGraphicsItem::ItemIsFocusable);
+
+    inputContext.resets = 0;
+    scene.setFocusItem(item2);
+    QCOMPARE(inputContext.resets, 0);
+
+    inputContext.resets = 0;
+    scene.setFocusItem(item1);
+    QCOMPARE(inputContext.resets, 0);
+}
+
 void tst_QGraphicsView::task253415_reconnectUpdateSceneOnSceneChanged()
 {
     QGraphicsView view;