Add an is input method composing property to TextEdit and TextInput.

Allows input handling to be disabled or changed while an input method
is active.  This might be used to allow mouse events through to the element
or in conjunction with the cursor position to determine whether a click
occurred on the preedit text.

Change-Id: I35e148691920579c1d7c6f27b7e805d9551beadd
Task-number: QTBUG-17835
Reviewed-by: Martin Jones

4 files changed, 63 insertions, 8 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativetextedit.cpp b/src/declarative/graphicsitems/qdeclarativetextedit.cpp
index 59921d5..9148e88 100644
--- a/src/declarative/graphicsitems/qdeclarativetextedit.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetextedit.cpp
@@ -1318,7 +1318,10 @@ Handles the given input method \a event.
 void QDeclarativeTextEdit::inputMethodEvent(QInputMethodEvent *event)
 {
     Q_D(QDeclarativeTextEdit);
+    const bool wasComposing = isInputMethodComposing();
     d->control->processEvent(event, QPointF(0, -d->yoff));
+    if (wasComposing != isInputMethodComposing())
+        emit inputMethodComposingChanged();
 }
 
 /*!
@@ -1394,6 +1397,27 @@ bool QDeclarativeTextEdit::canPaste() const
     return d->canPaste;
 }
 
+/*!
+    \qmlproperty bool TextEdit::isInputMethodComposing()
+
+    \since QtQuick 1.1
+
+    This property holds whether the TextEdit has partial text input from an
+    input method.
+
+    While it is composing an input method may rely on mouse or key events from
+    the TextEdit to edit or commit the partial text.  This property can be used
+    to determine when to disable events handlers that may interfere with the
+    correct operation of an input method.
+*/
+bool QDeclarativeTextEdit::isInputMethodComposing() const
+{
+    Q_D(const QDeclarativeTextEdit);
+    if (QTextLayout *layout = d->control->textCursor().block().layout())
+        return layout->preeditAreaText().length() > 0;
+    return false;
+}
+
 void QDeclarativeTextEditPrivate::init()
 {
     Q_Q(QDeclarativeTextEdit);
diff --git a/src/declarative/graphicsitems/qdeclarativetextedit_p.h b/src/declarative/graphicsitems/qdeclarativetextedit_p.h
index 7785a7a..612f9a9 100644
--- a/src/declarative/graphicsitems/qdeclarativetextedit_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetextedit_p.h
@@ -94,6 +94,7 @@ class Q_AUTOTEST_EXPORT QDeclarativeTextEdit : public QDeclarativeImplicitSizePa
     Q_PROPERTY(bool selectByMouse READ selectByMouse WRITE setSelectByMouse NOTIFY selectByMouseChanged)
     Q_PROPERTY(SelectionMode mouseSelectionMode READ mouseSelectionMode WRITE setMouseSelectionMode NOTIFY mouseSelectionModeChanged REVISION 1)
     Q_PROPERTY(bool canPaste READ canPaste NOTIFY canPasteChanged REVISION 1)
+    Q_PROPERTY(bool inputMethodComposing READ isInputMethodComposing NOTIFY inputMethodComposingChanged REVISION 1)
 
 public:
     QDeclarativeTextEdit(QDeclarativeItem *parent=0);
@@ -215,6 +216,8 @@ public:
 
     QRectF boundingRect() const;
 
+    bool isInputMethodComposing() const;
+
 Q_SIGNALS:
     void textChanged(const QString &);
     void paintedSizeChanged();
@@ -242,6 +245,7 @@ Q_SIGNALS:
     Q_REVISION(1) void mouseSelectionModeChanged(SelectionMode mode);
     Q_REVISION(1) void linkActivated(const QString &link);
     Q_REVISION(1) void canPasteChanged();
+    Q_REVISION(1) void inputMethodComposingChanged();
 
 public Q_SLOTS:
     void selectAll();
diff --git a/src/declarative/graphicsitems/qdeclarativetextinput.cpp b/src/declarative/graphicsitems/qdeclarativetextinput.cpp
index 65ed5c6..88b55df 100644
--- a/src/declarative/graphicsitems/qdeclarativetextinput.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetextinput.cpp
@@ -996,18 +996,22 @@ void QDeclarativeTextInput::inputMethodEvent(QInputMethodEvent *ev)
 {
     Q_D(QDeclarativeTextInput);
     ev->ignore();
+    const bool wasComposing = d->control->preeditAreaText().length() > 0;
     inputMethodPreHandler(ev);
-    if (ev->isAccepted())
-        return;
-    if (d->control->isReadOnly()) {
-        ev->ignore();
-    } else {
-        d->control->processInputMethodEvent(ev);
-        updateSize();
-        d->updateHorizontalScroll();
+    if (!ev->isAccepted()) {
+        if (d->control->isReadOnly()) {
+            ev->ignore();
+        } else {
+            d->control->processInputMethodEvent(ev);
+            updateSize();
+            d->updateHorizontalScroll();
+        }
     }
     if (!ev->isAccepted())
         QDeclarativePaintedItem::inputMethodEvent(ev);
+
+    if (wasComposing != (d->control->preeditAreaText().length() > 0))
+        emit inputMethodComposingChanged();
 }
 
 /*!
@@ -1706,6 +1710,25 @@ void QDeclarativeTextInput::focusInEvent(QFocusEvent *event)
     QDeclarativePaintedItem::focusInEvent(event);
 }
 
+/*!
+    \qmlproperty bool TextInput::isInputMethodComposing()
+
+    \since QtQuick 1.1
+
+    This property holds whether the TextInput has partial text input from an
+    input method.
+
+    While it is composing an input method may rely on mouse or key events from
+    the TextInput to edit or commit the partial text.  This property can be
+    used to determine when to disable events handlers that may interfere with
+    the correct operation of an input method.
+*/
+bool QDeclarativeTextInput::isInputMethodComposing() const
+{
+    Q_D(const QDeclarativeTextInput);
+    return d->control->preeditAreaText().length() > 0;
+}
+
 void QDeclarativeTextInputPrivate::init()
 {
     Q_Q(QDeclarativeTextInput);
diff --git a/src/declarative/graphicsitems/qdeclarativetextinput_p.h b/src/declarative/graphicsitems/qdeclarativetextinput_p.h
index c29be26..79f5230 100644
--- a/src/declarative/graphicsitems/qdeclarativetextinput_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetextinput_p.h
@@ -97,6 +97,7 @@ class Q_AUTOTEST_EXPORT QDeclarativeTextInput : public QDeclarativeImplicitSizeP
     Q_PROPERTY(bool selectByMouse READ selectByMouse WRITE setSelectByMouse NOTIFY selectByMouseChanged)
     Q_PROPERTY(SelectionMode mouseSelectionMode READ mouseSelectionMode WRITE setMouseSelectionMode NOTIFY mouseSelectionModeChanged REVISION 1)
     Q_PROPERTY(bool canPaste READ canPaste NOTIFY canPasteChanged REVISION 1)
+    Q_PROPERTY(bool inputMethodComposing READ isInputMethodComposing NOTIFY inputMethodComposingChanged REVISION 1)
 
 public:
     QDeclarativeTextInput(QDeclarativeItem* parent=0);
@@ -210,6 +211,8 @@ public:
     QRectF boundingRect() const;
     bool canPaste() const;
 
+    bool isInputMethodComposing() const;
+
 Q_SIGNALS:
     void textChanged();
     void cursorPositionChanged();
@@ -237,6 +240,7 @@ Q_SIGNALS:
     void selectByMouseChanged(bool selectByMouse);
     Q_REVISION(1) void mouseSelectionModeChanged(SelectionMode mode);
     Q_REVISION(1) void canPasteChanged();
+    Q_REVISION(1) void inputMethodComposingChanged();
 
 protected:
     virtual void geometryChanged(const QRectF &newGeometry,