qaccessiblewidgets.cpp

奇趣公司比较新的qt/emd版本

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the plugins of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [e-mail].
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** In addition, as a special exception, Trolltech, as the sole copyright
** holder for Qt Designer, grants users of the Qt/Eclipse Integration
** plug-in the right for the Qt/Eclipse Integration to link to
** functionality provided by Qt Designer and its related libraries.
**
** Trolltech reserves all rights not expressly granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qaccessiblewidgets.h"
#include "qabstracttextdocumentlayout.h"
#include "qapplication.h"
#include "qclipboard.h"
#include "qtextedit.h"
#include "private/qtextedit_p.h"
#include "qtextdocument.h"
#include "qtextobject.h"
#include "qscrollbar.h"
#include "qdebug.h"
#include <QApplication>
#include <QStackedWidget>
#include <QToolBox>
#include <QMdiArea>
#include <QMdiSubWindow>
#include <QWorkspace>
#include <QDialogButtonBox>
#include <limits.h>
#include <QRubberBand>
#include <QTextBrowser>
#include <QCalendarWidget>
#include <QAbstractItemView>
#include <QDockWidget>
#include <QMainWindow>
#include <QAbstractButton>
#include <private/qdockwidget_p.h>
#include <QtGui/QFocusFrame>

#ifndef QT_NO_ACCESSIBILITY
using namespace QAccessible2;

QList<QWidget*> childWidgets(const QWidget *widget, bool includeTopLevel)
{
    if (widget == 0)
        return QList<QWidget*>();
    QList<QObject*> list = widget->children();
    QList<QWidget*> widgets;
    for (int i = 0; i < list.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(list.at(i));
        if (w && (includeTopLevel || !w->isWindow() ) && !qobject_cast<QFocusFrame*>(w))
            widgets.append(w);
    }
    return widgets;
}

static inline int distance(QWidget *source, QWidget *target,
                           QAccessible::RelationFlag relation)
{
    if (!source || !target)
        return -1;

    int returnValue = -1;
    switch (relation) {
    case QAccessible::Up:
        if (target->y() <= source->y())
            returnValue = source->y() - target->y();
        break;
    case QAccessible::Down:
        if (target->y() >= source->y() + source->height())
            returnValue = target->y() - (source->y() + source->height());
        break;
    case QAccessible::Right:
        if (target->x() >= source->x() + source->width())
            returnValue = target->x() - (source->x() + source->width());
        break;
    case QAccessible::Left:
        if (target->x() <= source->x())
            returnValue = source->x() - target->x();
        break;
    default:
        break;
    }
    return returnValue;
}

static inline QWidget *mdiAreaNavigate(QWidget *area,
                                       QAccessible::RelationFlag relation, int entry)
{
#if defined(QT_NO_MDIAREA) && defined(QT_NO_WORKSPACE)
    Q_UNUSED(area);
#endif
#ifndef QT_NO_MDIAREA
    const QMdiArea *mdiArea = qobject_cast<QMdiArea *>(area);
#endif
#ifndef QT_NO_WORKSPACE
    const QWorkspace *workspace = qobject_cast<QWorkspace *>(area);
#endif
    if (true
#ifndef QT_NO_MDIAREA
        && !mdiArea
#endif
#ifndef QT_NO_WORKSPACE
    && !workspace
#endif
    )
        return 0;

    QWidgetList windows;
#ifndef QT_NO_MDIAREA
    if (mdiArea) {
        foreach (QMdiSubWindow *window, mdiArea->subWindowList())
            windows.append(window);
    } else
#endif
    {
#ifndef QT_NO_WORKSPACE
        foreach (QWidget *window, workspace->windowList())
            windows.append(window->parentWidget());
#endif
    }

    if (windows.isEmpty() || entry < 1 || entry > windows.count())
        return 0;

    QWidget *source = windows.at(entry - 1);
    QMap<int, QWidget *> candidates;
    foreach (QWidget *window, windows) {
        if (source == window)
            continue;
        int candidateDistance = distance(source, window, relation);
        if (candidateDistance >= 0)
            candidates.insert(candidateDistance, window);
    }

    int minimumDistance = INT_MAX;
    QWidget *target = 0;
    foreach (QWidget *candidate, candidates.values()) {
        switch (relation) {
        case QAccessible::Up:
        case QAccessible::Down:
            if (qAbs(candidate->x() - source->x()) < minimumDistance) {
                target = candidate;
                minimumDistance = qAbs(candidate->x() - source->x());
            }
            break;
        case QAccessible::Left:
        case QAccessible::Right:
            if (qAbs(candidate->y() - source->y()) < minimumDistance) {
                target = candidate;
                minimumDistance = qAbs(candidate->y() - source->y());
            }
            break;
        default:
            break;
        }
        if (minimumDistance == 0)
            break;
    }

#ifndef QT_NO_WORKSPACE
    if (workspace) {
        foreach (QWidget *widget, workspace->windowList()) {
            if (widget->parentWidget() == target)
                target = widget;
        }
    }
#endif
    return target;
}

#ifndef QT_NO_TEXTEDIT

/*!
  \class QAccessibleTextEdit qaccessiblewidget.h
  \brief The QAccessibleTextEdit class implements the QAccessibleInterface for richtext editors.
  \internal
*/

static QTextBlock qTextBlockAt(const QTextDocument *doc, int pos)
{
    Q_ASSERT(pos >= 0);

    QTextBlock block = doc->begin();
    int i = 0;
    while (block.isValid() && i < pos) {
        block = block.next();
        ++i;
    }
    return block;
}

static int qTextBlockPosition(QTextBlock block)
{
    int child = 0;
    while (block.isValid()) {
        block = block.previous();
        ++child;
    }

    return child;
}

/*!
  \fn QAccessibleTextEdit::QAccessibleTextEdit(QWidget* widget)

  Constructs a QAccessibleTextEdit object for a \a widget.
*/
QAccessibleTextEdit::QAccessibleTextEdit(QWidget *o)
: QAccessibleWidgetEx(o, EditableText)
{
    Q_ASSERT(widget()->inherits("QTextEdit"));
    childOffset = QAccessibleWidgetEx::childCount();
}

/*! Returns the text edit. */
QTextEdit *QAccessibleTextEdit::textEdit() const
{
    return static_cast<QTextEdit *>(widget());
}

QRect QAccessibleTextEdit::rect(int child) const
{
    if (child <= childOffset)
        return QAccessibleWidgetEx::rect(child);

     QTextEdit *edit = textEdit();
     QTextBlock block = qTextBlockAt(edit->document(), child - childOffset - 1);
     if (!block.isValid())
         return QRect();

     QRect rect = edit->document()->documentLayout()->blockBoundingRect(block).toRect();
     rect.translate(-edit->horizontalScrollBar()->value(), -edit->verticalScrollBar()->value());

     rect = edit->viewport()->rect().intersect(rect);
     if (rect.isEmpty())
         return QRect();

     return rect.translated(edit->viewport()->mapToGlobal(QPoint(0, 0)));
}

int QAccessibleTextEdit::childAt(int x, int y) const
{
    QTextEdit *edit = textEdit();
    if (!edit->isVisible())
        return -1;

    QPoint point = edit->viewport()->mapFromGlobal(QPoint(x, y));
    QTextBlock block = edit->cursorForPosition(point).block();
    if (block.isValid())
        return qTextBlockPosition(block) + childOffset;

    return QAccessibleWidgetEx::childAt(x, y);
}

/*! \reimp */
QString QAccessibleTextEdit::text(Text t, int child) const
{
    if (t == Value) {
        if (child > childOffset)
            return qTextBlockAt(textEdit()->document(), child - childOffset - 1).text();
        if (!child)
            return textEdit()->toPlainText();
    }

    return QAccessibleWidgetEx::text(t, child);
}

/*! \reimp */
void QAccessibleTextEdit::setText(Text t, int child, const QString &text)
{
    if (t != Value || (child > 0 && child <= childOffset)) {
        QAccessibleWidgetEx::setText(t, child, text);
        return;
    }
    if (textEdit()->isReadOnly())
        return;

    if (!child) {
        textEdit()->setText(text);
        return;
    }
    QTextBlock block = qTextBlockAt(textEdit()->document(), child - childOffset - 1);
    if (!block.isValid())
        return;

    QTextCursor cursor(block);
    cursor.select(QTextCursor::BlockUnderCursor);
    cursor.insertText(text);
}

/*! \reimp */
QAccessible::Role QAccessibleTextEdit::role(int child) const
{
    if (child > childOffset)
        return EditableText;
    return QAccessibleWidgetEx::role(child);
}

QVariant QAccessibleTextEdit::invokeMethodEx(QAccessible::Method method, int child,
                                                     const QVariantList &params)
{
    if (child)
        return QVariant();

    switch (method) {
    case ListSupportedMethods: {
        QSet<QAccessible::Method> set;
        set << ListSupportedMethods << SetCursorPosition << GetCursorPosition;
        return qVariantFromValue(set | qvariant_cast<QSet<QAccessible::Method> >(
                    QAccessibleWidgetEx::invokeMethodEx(method, child, params)));
    }
    case SetCursorPosition:
        setCursorPosition(params.value(0).toInt());
        return true;
    case GetCursorPosition:
        return textEdit()->textCursor().position();
    default:
        return QAccessibleWidgetEx::invokeMethodEx(method, child, params);
    }
}

int QAccessibleTextEdit::childCount() const
{
    return childOffset + textEdit()->document()->blockCount();
}
#endif // QT_NO_TEXTEDIT

#ifndef QT_NO_STACKEDWIDGET
// ======================= QAccessibleStackedWidget ======================
QAccessibleStackedWidget::QAccessibleStackedWidget(QWidget *widget)
    : QAccessibleWidgetEx(widget, LayeredPane)
{
    Q_ASSERT(qobject_cast<QStackedWidget *>(widget));
}

QVariant QAccessibleStackedWidget::invokeMethodEx(QAccessible::Method, int, const QVariantList &)
{
    return QVariant();
}


int QAccessibleStackedWidget::childAt(int x, int y) const
{
    if (!stackedWidget()->isVisible())
        return -1;
    QWidget *currentWidget = stackedWidget()->currentWidget();
    if (!currentWidget)
        return -1;
    QPoint position = currentWidget->mapFromGlobal(QPoint(x, y));
    if (currentWidget->rect().contains(position))
        return 1;
    return -1;
}

int QAccessibleStackedWidget::childCount() const
{
    return stackedWidget()->count();
}

int QAccessibleStackedWidget::indexOfChild(const QAccessibleInterface *child) const
{
    if (!child || (stackedWidget()->currentWidget() != child->object()))
        return -1;
    return 1;
}

int QAccessibleStackedWidget::navigate(RelationFlag relation, int entry, QAccessibleInterface **target) const
{
    *target = 0;

    QObject *targetObject = 0;
    switch (relation) {
    case Child:
        if (entry != 1)
            return -1;
        targetObject = stackedWidget()->currentWidget();
        break;
    default:
        return QAccessibleWidgetEx::navigate(relation, entry, target);
    }
    *target = QAccessible::queryAccessibleInterface(targetObject);
    return *target ? 0 : -1;