Implemented QAccessibleTextWidget

A new class called QAccessibleTextWidget was added.
This class should implement all methods of QAccessibleTextInterface and
QAccessibleEditableTextInterface which only need a QTextCursor, and it
defines two pure virtual methods, to obtain and set the text cursor, so
accessible implementations of widgets which use a text cursor can implement
these two methods.

QAccessibleTextEdit is now a subclass of QAccessibleTextWidget and most of
its methods were moved to QAccessibleTextWidget.

This is a forward port of ba5d7d608cc31fc63354fd74d85a1bad7780fc45 from
Qt 4.8, and is a prerequisite for forward-porting QPlainTextEdit

Change-Id: I6093c4fa7e0a77b84de779479c6074db006efec1
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>

1 files changed, 44 insertions, 15 deletions

diff --git a/src/plugins/accessible/widgets/qaccessiblewidgets.h b/src/plugins/accessible/widgets/qaccessiblewidgets.h
index dba645570a..e403465ba3 100644
--- a/src/plugins/accessible/widgets/qaccessiblewidgets.h
+++ b/src/plugins/accessible/widgets/qaccessiblewidgets.h
@@ -48,6 +48,7 @@
 #ifndef QT_NO_ACCESSIBILITY
 
 #include <QtCore/QPointer>
+#include <QtCore/QPair>
 
 QT_BEGIN_NAMESPACE
 
@@ -63,19 +64,16 @@ class QAbstractItemView;
 class QDockWidget;
 class QDockWidgetLayout;
 class QMainWindow;
+class QTextCursor;
+class QTextDocument;
 
-#ifndef QT_NO_TEXTEDIT
-class QAccessibleTextEdit : public QAccessibleWidget, public QAccessibleTextInterface,
-                            public QAccessibleEditableTextInterface
+#ifndef QT_NO_CURSOR
+class QAccessibleTextWidget : public QAccessibleWidget,
+                              public QAccessibleTextInterface,
+                              public QAccessibleEditableTextInterface
 {
 public:
-    explicit QAccessibleTextEdit(QWidget *o);
-
-    QString text(QAccessible::Text t) const;
-    void setText(QAccessible::Text t, const QString &text);
-    QAccessible::State state() const;
-
-    void *interface_cast(QAccessible::InterfaceType t);
+    QAccessibleTextWidget(QWidget *o, QAccessible::Role r = QAccessible::EditableText, const QString &name = QString());
 
     // QAccessibleTextInterface
     void addSelection(int startOffset, int endOffset);
@@ -86,17 +84,17 @@ public:
     int offsetAtPoint(const QPoint &point) const;
     void selection(int selectionIndex, int *startOffset, int *endOffset) const;
     QString text(int startOffset, int endOffset) const;
-    QString textBeforeOffset (int offset, QAccessible2::BoundaryType boundaryType,
-            int *startOffset, int *endOffset) const;
+    QString textBeforeOffset(int offset, QAccessible2::BoundaryType boundaryType,
+                             int *startOffset, int *endOffset) const;
     QString textAfterOffset(int offset, QAccessible2::BoundaryType boundaryType,
-            int *startOffset, int *endOffset) const;
+                            int *startOffset, int *endOffset) const;
     QString textAtOffset(int offset, QAccessible2::BoundaryType boundaryType,
-            int *startOffset, int *endOffset) const;
+                         int *startOffset, int *endOffset) const;
     void removeSelection(int selectionIndex);
     void setCursorPosition(int position);
     void setSelection(int selectionIndex, int startOffset, int endOffset);
     int characterCount() const;
-    void scrollToSubstring(int startIndex, int endIndex);
+
 
     // QAccessibleEditableTextInterface
     void deleteText(int startOffset, int endOffset);
@@ -104,8 +102,39 @@ public:
     void replaceText(int startOffset, int endOffset, const QString &text);
 
 protected:
+    QTextCursor textCursorForRange(int startOffset, int endOffset) const;
+    QPair<int, int> getBoundaries(int offset, QAccessible2::BoundaryType boundaryType) const;
+    virtual QPoint scrollBarsCurrentPosition() const;
+    virtual QTextCursor textCursor() const = 0;
+    virtual void setTextCursor(const QTextCursor &) = 0;
+    virtual QTextDocument *textDocument() const = 0;
+    virtual QWidget *viewport() const = 0;
+};
+#endif  //QT_NO_CURSOR
+
+#ifndef QT_NO_TEXTEDIT
+class QAccessibleTextEdit : public QAccessibleTextWidget
+{
+public:
+    explicit QAccessibleTextEdit(QWidget *o);
+
+    QString text(QAccessible::Text t) const;
+    void setText(QAccessible::Text t, const QString &text);
+    QAccessible::State state() const;
+
+    void *interface_cast(QAccessible::InterfaceType t);
+
+    // QAccessibleTextInterface
+    void scrollToSubstring(int startIndex, int endIndex);
+
+protected:
     QTextEdit *textEdit() const;
 
+    QPoint scrollBarsCurrentPosition() const;
+    QTextCursor textCursor() const;
+    void setTextCursor(const QTextCursor &textCursor);
+    QTextDocument *textDocument() const;
+    QWidget *viewport() const;
 private:
     int childOffset;
 };