source: trunk/src/gui/util/qundoview.cpp@ 835

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#include "qundostack.h"
#include "qundoview.h"

#ifndef QT_NO_UNDOVIEW

#include "qundogroup.h"
#include <QtCore/qabstractitemmodel.h>
#include <QtCore/qpointer.h>
#include <QtGui/qicon.h>
#include <private/qlistview_p.h>

QT_BEGIN_NAMESPACE

class QUndoModel : public QAbstractItemModel
{
    Q_OBJECT
public:
    QUndoModel(QObject *parent = 0);

    QUndoStack *stack() const;

    virtual QModelIndex index(int row, int column,
                const QModelIndex &parent = QModelIndex()) const;
    virtual QModelIndex parent(const QModelIndex &child) const;
    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

    QModelIndex selectedIndex() const;
    QItemSelectionModel *selectionModel() const;

    QString emptyLabel() const;
    void setEmptyLabel(const QString &label);

    void setCleanIcon(const QIcon &icon);
    QIcon cleanIcon() const;

public slots:
    void setStack(QUndoStack *stack);

private slots:
    void stackChanged();
    void stackDestroyed(QObject *obj);
    void setStackCurrentIndex(const QModelIndex &index);

private:
    QUndoStack *m_stack;
    QItemSelectionModel *m_sel_model;
    QString m_emty_label;
    QIcon m_clean_icon;
};

QUndoModel::QUndoModel(QObject *parent)
    : QAbstractItemModel(parent)
{
    m_stack = 0;
    m_sel_model = new QItemSelectionModel(this, this);
    connect(m_sel_model, SIGNAL(currentChanged(QModelIndex,QModelIndex)),
            this, SLOT(setStackCurrentIndex(QModelIndex)));
    m_emty_label = tr("<empty>");
}

QItemSelectionModel *QUndoModel::selectionModel() const
{
    return m_sel_model;
}

QUndoStack *QUndoModel::stack() const
{
    return m_stack;
}

void QUndoModel::setStack(QUndoStack *stack)
{
    if (m_stack == stack)
        return;

    if (m_stack != 0) {
        disconnect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));
        disconnect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));
        disconnect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));
    }
    m_stack = stack;
    if (m_stack != 0) {
        connect(m_stack, SIGNAL(cleanChanged(bool)), this, SLOT(stackChanged()));
        connect(m_stack, SIGNAL(indexChanged(int)), this, SLOT(stackChanged()));
        connect(m_stack, SIGNAL(destroyed(QObject*)), this, SLOT(stackDestroyed(QObject*)));
    }

    stackChanged();
}

void QUndoModel::stackDestroyed(QObject *obj)
{
    if (obj != m_stack)
        return;
    m_stack = 0;

    stackChanged();
}

void QUndoModel::stackChanged()
{
    reset();
    m_sel_model->setCurrentIndex(selectedIndex(), QItemSelectionModel::ClearAndSelect);
}

void QUndoModel::setStackCurrentIndex(const QModelIndex &index)
{
    if (m_stack == 0)
        return;

    if (index == selectedIndex())