/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the accessibility module of the Qt Toolkit.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** 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 "qaccessiblecompat.h"
#include "q3widgetstack.h"

#include <q3listview.h>
#include <q3textedit.h>
#include <q3iconview.h>
#include <q3listbox.h>

/*!
\fn Q3AccessibleScrollView::Q3AccessibleScrollView(QWidget* widget, Role role)

Constructs a Q3AccessibleScrollView object for a \a widget.
The \a role is propagated to the QAccessibleWidget constructor.
*/
Q3AccessibleScrollView::Q3AccessibleScrollView(QWidget *w, Role role)
: QAccessibleWidget(w, role)
{
}

/*!
  Returns the ID of the item at viewport position \a x, \a y.
*/
int Q3AccessibleScrollView::itemAt(int /*x*/, int /*y*/) const
{
    return 0;
}

/*!
  Returns the location in viewport coordinates of the item with ID \a
  item.
*/
QRect Q3AccessibleScrollView::itemRect(int /*item*/) const
{
    return QRect();
}

/*!
  Returns the number of items in the scroll view.
*/
int Q3AccessibleScrollView::itemCount() const
{
    return 0;
}

/*!
  \class QAccessibleListView qaccessiblewidget.h
  \brief The QAccessibleListView class implements the QAccessibleInterface for list views.
  \internal
*/

static Q3ListViewItem *findLVItem(Q3ListView* listView, int child)
{
    int id = 1;
    Q3ListViewItemIterator it(listView);
    Q3ListViewItem *item = it.current();
    while (item && id < child) {
        ++it;
        ++id;
        item = it.current();
    }
    return item;
}

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

  Constructs a QAccessibleListView object for a \a widget.
*/
QAccessibleListView::QAccessibleListView(QWidget *o)
    : Q3AccessibleScrollView(o, Tree)
{
}

/*! Returns the list view. */
Q3ListView *QAccessibleListView::listView() const
{
    Q_ASSERT(widget()->inherits("Q3ListView"));
    return (Q3ListView*)widget();
}

/*! \reimp */
int QAccessibleListView::itemAt(int x, int y) const
{
    Q3ListViewItem *item = listView()->itemAt(QPoint(x, y));
    if (!item)
        return 0;

    Q3ListViewItemIterator it(listView());
    int c = 1;
    while (it.current()) {
        if (it.current() == item)
            return c;
        ++c;
        ++it;
    }
    return 0;
}

/*! \reimp */
QRect QAccessibleListView::itemRect(int child) const
{
    Q3ListViewItem *item = findLVItem(listView(), child);
    if (!item)
        return QRect();
    return listView()->itemRect(item);
}

/*! \reimp */
int QAccessibleListView::itemCount() const
{
    Q3ListViewItemIterator it(listView());
    int c = 0;
    while (it.current()) {
        ++c;
        ++it;
    }

    return c;
}

/*! \reimp */
QString QAccessibleListView::text(Text t, int child) const
{
    if (!child || t != Name)
        return Q3AccessibleScrollView::text(t, child);

    Q3ListViewItem *item = findLVItem(listView(), child);
    if (!item)
        return QString();
    return item->text(0);
}

/*! \reimp */
QAccessible::Role QAccessibleListView::role(int child) const
{
    if (!child)
        return Q3AccessibleScrollView::role(child);
    return TreeItem;
}

/*! \reimp */
QAccessible::State QAccessibleListView::state(int child) const
{
    State state = Q3AccessibleScrollView::state(child);
    Q3ListViewItem *item;
    if (!child || !(item = findLVItem(listView(), child)))
        return state;

    if (item->isSelectable()) {
        if (listView()->selectionMode() == Q3ListView::Multi)
            state |= MultiSelectable;
        else if (listView()->selectionMode() == Q3ListView::Extended)
            state |= ExtSelectable;
        else if (listView()->selectionMode() == Q3ListView::Single)
            state |= Selectable;
        if (item->isSelected())
            state |= Selected;
    }
    if (listView()->focusPolicy() != Qt::NoFocus) {
        state |= Focusable;
        if (item == listView()->currentItem())
            state |= Focused;
    }
    if (item->childCount()) {
        if (item->isOpen())
            state |= Expanded;
        else
            state |= Collapsed;
    }
    if (!listView()->itemRect(item).isValid())
        state |= Invisible;

    if (item->rtti() == Q3CheckListItem::RTTI) {
        if (((Q3CheckListItem*)item)->isOn())
            state|=Checked;
    }
    return state;
}

/* \reimp
QAccessibleInterface *QAccessibleListView::focusChild(int *child) const
{
    Q3ListViewItem *item = listView()->currentItem();
    if (!item)
        return 0;

    Q3ListViewItemIterator it(listView());
    int c = 1;
    while (it.current()) {
        if (it.current() == item) {
            *child = c;
            return (QAccessibleInterface*)this;
        }
        ++c;
        ++it;
    }
    return 0;
}
*/
/* \reimp
bool QAccessibleListView::setFocus(int child)
{
    bool res = Q3AccessibleScrollView::setFocus(0);
    if (!child || !res)
        return res;

    Q3ListViewItem *item = findLVItem(listView(), child);
    if (!item)
        return false;
    listView()->setCurrentItem(item);
    return true;
}*/

/*! \internal */
bool QAccessibleListView::setSelected(int child, bool on, bool extend)
{
    if (!child || (extend &&
        listView()->selectionMode() != Q3ListView::Extended &&
        listView()->selectionMode() != Q3ListView::Multi))
        return false;

    Q3ListViewItem *item = findLVItem(listView(), child);
    if (!item)
        return false;
    if (!extend) {
        listView()->setSelected(item, on);
    } else {
        Q3ListViewItem *current = listView()->currentItem();
        if (!current)
            return false;
        bool down = item->itemPos() > current->itemPos();
        Q3ListViewItemIterator it(current);
        while (it.current()) {
            listView()->setSelected(it.current(), on);
            if (it.current() == item)
                break;
            if (down)
                ++it;
            else
                --it;
        }
    }
    return true;
}

/*! \internal */
void QAccessibleListView::clearSelection()
{
    listView()->clearSelection();
}

/*! \internal */
QVector<int> QAccessibleListView::selection() const
{
    QVector<int> array;
    uint size = 0;
    int id = 1;
    array.resize(size);
    Q3ListViewItemIterator it(listView());
    while (it.current()) {
        if (it.current()->isSelected()) {
            ++size;
            array.resize(size);
            array[(int)size-1] = id;
        }
        ++it;
        ++id;
    }
    return array;
}

/*!
  \class QAccessibleIconView qaccessiblewidget.h
  \brief The QAccessibleIconView class implements the QAccessibleInterface for icon views.
  \internal
*/

static Q3IconViewItem *findIVItem(Q3IconView *iconView, int child)
{
    int id = 1;
    Q3IconViewItem *item = iconView->firstItem();
    while (item && id < child) {
        item = item->nextItem();
        ++id;
    }

    return item;
}

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

  Constructs a QAccessibleIconView object for a \a widget.
*/
QAccessibleIconView::QAccessibleIconView(QWidget *o)
    : Q3AccessibleScrollView(o, List)
{
    Q_ASSERT(widget()->inherits("Q3IconView"));
}

/*! Returns the icon view. */
Q3IconView *QAccessibleIconView::iconView() const
{
    return (Q3IconView*)widget();
}

/*! \internal */
int QAccessibleIconView::itemAt(int x, int y) const
{
    Q3IconViewItem *item = iconView()->findItem(QPoint(x, y));
    return iconView()->index(item) + 1;
}

/*! \internal */
QRect QAccessibleIconView::itemRect(int child) const
{
    Q3IconViewItem *item = findIVItem(iconView(), child);

    if (!item)
        return QRect();
    return item->rect();
}

/*! \internal */
int QAccessibleIconView::itemCount() const
{
    return iconView()->count();
}

/*! \internal */
QString QAccessibleIconView::text(Text t, int child) const
{
    if (!child || t != Name)
        return Q3AccessibleScrollView::text(t, child);

    Q3IconViewItem *item = findIVItem(iconView(), child);
    if (!item)
        return QString();
    return item->text();
}

/*! \internal */
QAccessible::Role QAccessibleIconView::role(int child) const
{
    if (!child)
        return Q3AccessibleScrollView::role(child);
    return ListItem;
}

/*! \internal */
QAccessible::State QAccessibleIconView::state(int child) const
{
    State state = Q3AccessibleScrollView::state(child);
    Q3IconViewItem *item;
    if (!child || !(item = findIVItem(iconView(), child)))
        return state;

    if (item->isSelectable()) {
        if (iconView()->selectionMode() == Q3IconView::Multi)
            state |= MultiSelectable;
        else if (iconView()->selectionMode() == Q3IconView::Extended)
            state |= ExtSelectable;
        else if (iconView()->selectionMode() == Q3IconView::Single)
            state |= Selectable;
        if (item->isSelected())
            state |= Selected;
    }
    if (iconView()->itemsMovable())
        state |= Movable;
    if (iconView()->focusPolicy() != Qt::NoFocus) {
        state |= Focusable;
        if (item == iconView()->currentItem())
            state |= Focused;
    }

    return state;
}

/* \reimp
QAccessibleInterface *QAccessibleIconView::focusChild(int *child) const
{
    Q3IconViewItem *item = iconView()->currentItem();
    if (!item)
        return 0;

    *child = iconView()->index(item);
    return (QAccessibleInterface*)this;
}
*/
/* \reimp
bool QAccessibleIconView::setFocus(int child)
{
    bool res = Q3AccessibleScrollView::setFocus(0);
    if (!child || !res)
        return res;

    Q3IconViewItem *item = findIVItem(iconView(), child);
    if (!item)
        return false;
    iconView()->setCurrentItem(item);
    return true;
}*/

/*! \internal */
bool QAccessibleIconView::setSelected(int child, bool on, bool extend)
{
    if (!child || (extend &&
        iconView()->selectionMode() != Q3IconView::Extended &&
        iconView()->selectionMode() != Q3IconView::Multi))
        return false;

    Q3IconViewItem *item = findIVItem(iconView(), child);
    if (!item)
        return false;
    if (!extend) {
        iconView()->setSelected(item, on, true);
    } else {
        Q3IconViewItem *current = iconView()->currentItem();
        if (!current)
            return false;
        bool down = false;
        Q3IconViewItem *temp = current;
        while ((temp = temp->nextItem())) {
            if (temp == item) {
                down = true;
                break;
            }
        }
        temp = current;
        if (down) {
            while ((temp = temp->nextItem())) {
                iconView()->setSelected(temp, on, true);
                if (temp == item)
                    break;
            }
        } else {
            while ((temp = temp->prevItem())) {
                iconView()->setSelected(temp, on, true);
                if (temp == item)
                    break;
            }
        }
    }
    return true;
}

/*! \internal */
void QAccessibleIconView::clearSelection()
{
    iconView()->clearSelection();
}

/*! \internal */
QVector<int> QAccessibleIconView::selection() const
{
    QVector<int> array;
    uint size = 0;
    int id = 1;
    array.resize(iconView()->count());
    Q3IconViewItem *item = iconView()->firstItem();
    while (item) {
        if (item->isSelected()) {
            ++size;
            array[(int)size-1] = id;
        }
        item = item->nextItem();
        ++id;
    }
    array.resize(size);
    return array;
}


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

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

  Constructs a QAccessibleTextEdit object for a \a widget.
*/
QAccessibleTextEdit::QAccessibleTextEdit(QWidget *o)
: Q3AccessibleScrollView(o, Pane)
{
    Q_ASSERT(widget()->inherits("Q3TextEdit"));
}

/*! Returns the text edit. */
Q3TextEdit *QAccessibleTextEdit::textEdit() const
{

    return (Q3TextEdit*)widget();
}

/*! \reimp */
int QAccessibleTextEdit::itemAt(int x, int y) const
{
    int p;
    QPoint cp = textEdit()->viewportToContents(QPoint(x,y));
    textEdit()->charAt(cp , &p);
    return p + 1;
}

/*! \reimp */
QRect QAccessibleTextEdit::itemRect(int item) const
{
    QRect rect = textEdit()->paragraphRect(item - 1);
    if (!rect.isValid())
        return QRect();
    QPoint ntl = textEdit()->contentsToViewport(QPoint(rect.x(), rect.y()));
    return QRect(ntl.x(), ntl.y(), rect.width(), rect.height());
}

/*! \reimp */
int QAccessibleTextEdit::itemCount() const
{
    return textEdit()->paragraphs();
}

/*! \reimp */
QString QAccessibleTextEdit::text(Text t, int child) const
{
    if (t == Name && child > 0)
        return textEdit()->text(child - 1);
    if (t == Value) {
        if (child > 0)
            return textEdit()->text(child - 1);
        else
            return textEdit()->text();
    }

    return Q3AccessibleScrollView::text(t, child);
}

/*! \reimp */
void QAccessibleTextEdit::setText(Text t, int control, const QString &text)
{
    if (t != Value || control) {
        Q3AccessibleScrollView::setText(t, control, text);
        return;
    }
    textEdit()->setText(text);
}

/*! \reimp */
QAccessible::Role QAccessibleTextEdit::role(int child) const
{
    if (child)
        return EditableText;
    return Q3AccessibleScrollView::role(child);
}

/*!
  \class QAccessibleWidgetStack qaccessible.h
  \brief The QAccessibleWidgetStack class implements the QAccessibleInterface for widget stacks.

  \ingroup accessibility
  \internal
*/

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

  Creates a QAccessibleWidgetStack object for a \a widget.
*/
QAccessibleWidgetStack::QAccessibleWidgetStack(QWidget *w)
: QAccessibleWidget(w, LayeredPane)
{
    Q_ASSERT(widgetStack());
    setDescription("This is a widgetstack");
}

/*! Returns the widget stack. */
Q3WidgetStack *QAccessibleWidgetStack::widgetStack() const
{
    return qobject_cast<Q3WidgetStack*>(object());
}

/*! \reimp */
int QAccessibleWidgetStack::childCount() const
{
    // a widget stack has always only one accessible widget
    return 1;
}

/*! \reimp */
int QAccessibleWidgetStack::indexOfChild(const QAccessibleInterface *child) const
{
    QObject *childObject = child ? child->object() : 0;
    if (childObject != widgetStack()->visibleWidget())
        return -1;
    return 1;
}

/*! \reimp */
int QAccessibleWidgetStack::childAt(int, int) const
{
    QWidget *curPage = widgetStack()->visibleWidget();
    if (!curPage)
        return 0;
    return 1;
}

/*! \reimp */
int QAccessibleWidgetStack::navigate(RelationFlag rel, int entry,
                                     QAccessibleInterface **target) const
{
    *target = 0;
    QObject *targetObject = 0;
    switch (rel) {
    // Hierarchical
    case Child:
        if (entry != 1)
            return -1;
        targetObject = widgetStack()->visibleWidget();
        break;
    default:
        return QAccessibleWidget::navigate(rel, entry, target);
    }
    *target = QAccessible::queryAccessibleInterface(targetObject);
    return *target ? 0 : -1;
}

/*!
  \class QAccessibleListBox qaccessiblewidget.h
  \brief The QAccessibleListBox class implements the QAccessibleInterface for list boxes.

  \ingroup accessibility
  \internal
*/

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

  Constructs a QAccessibleListBox object for a \a widget.
*/
QAccessibleListBox::QAccessibleListBox(QWidget *o)
    : Q3AccessibleScrollView(o, List)
{
    Q_ASSERT(widget()->inherits("Q3ListBox"));
}

/*! Returns the list box. */
Q3ListBox *QAccessibleListBox::listBox() const
{
    return (Q3ListBox*)widget();
}

/*! \reimp */
int QAccessibleListBox::itemAt(int x, int y) const
{
    Q3ListBoxItem *item = listBox()->itemAt(QPoint(x, y));
    return listBox()->index(item) + 1;
}

/*! \reimp */
QRect QAccessibleListBox::itemRect(int item) const
{
    return listBox()->itemRect(listBox()->item(item-1));
}

/*! \reimp */
int QAccessibleListBox::itemCount() const
{
    return listBox()->count();
}

/*! \reimp */
QString QAccessibleListBox::text(Text t, int child) const
{
    if (!child || t != Name)
        return Q3AccessibleScrollView::text(t, child);

    Q3ListBoxItem *item = listBox()->item(child - 1);
    if (item)
        return item->text();
    return QString();
}

/*! \reimp */
QAccessible::Role QAccessibleListBox::role(int child) const
{
    if (!child)
        return Q3AccessibleScrollView::role(child);
    return ListItem;
}

/*! \reimp */
QAccessible::State QAccessibleListBox::state(int child) const
{
    State state = Q3AccessibleScrollView::state(child);
    Q3ListBoxItem *item;
    if (!child || !(item = listBox()->item(child - 1)))
        return state;

    if (item->isSelectable()) {
        if (listBox()->selectionMode() == Q3ListBox::Multi)
            state |= MultiSelectable;
        else if (listBox()->selectionMode() == Q3ListBox::Extended)
            state |= ExtSelectable;
        else if (listBox()->selectionMode() == Q3ListBox::Single)
            state |= Selectable;
        if (item->isSelected())
            state |= Selected;
    }
    if (listBox()->focusPolicy() != Qt::NoFocus) {
        state |= Focusable;
        if (item->isCurrent())
            state |= Focused;
    }
    if (!listBox()->itemVisible(item))
        state |= Invisible;

    return state;
}

/* \reimp
bool QAccessibleListBox::setFocus(int child)
{
    bool res = Q3AccessibleScrollView::setFocus(0);
    if (!child || !res)
        return res;

    Q3ListBoxItem *item = listBox()->item(child -1);
    if (!item)
        return false;
    listBox()->setCurrentItem(item);
    return true;
}*/

/*!
    Selects the item with index \a child if \a on is true; otherwise
    unselects it. If \a extend is true and the selection mode is not
    \c Single and there is an existing selection, the selection is
    extended to include all the items from the existing selection up
    to and including the item with index \a child. Returns true if a
    selection was made or extended; otherwise returns false.

    \sa selection() clearSelection()
*/
bool QAccessibleListBox::setSelected(int child, bool on, bool extend)
{
    if (!child || (extend &&
        listBox()->selectionMode() != Q3ListBox::Extended &&
        listBox()->selectionMode() != Q3ListBox::Multi))
        return false;

    Q3ListBoxItem *item = listBox()->item(child -1);
    if (!item)
        return false;
    if (!extend) {
        listBox()->setSelected(item, on);
    } else {
        int current = listBox()->currentItem();
        bool down = child > current;
        for (int i = current; i != child;) {
            down ? i++ : i--;
            listBox()->setSelected(i, on);
        }

    }
    return true;
}

/*!
    Sets all the items in the list box to be unselected.

    \sa setSelected() selection()
*/
void QAccessibleListBox::clearSelection()
{
    listBox()->clearSelection();
}

/*!
    Returns a (possibly empty) list of indexes of the items selected
    in the list box.

    \sa setSelected() clearSelection()
*/
QVector<int> QAccessibleListBox::selection() const
{
    QVector<int> array;
    uint size = 0;
    const uint c = listBox()->count();
    array.resize(c);
    for (uint i = 0; i < c; ++i) {
        if (listBox()->isSelected(i)) {
            ++size;
            array[(int)size-1] = i+1;
        }
    }
    array.resize(size);
    return array;
}
