change.h

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#pragma once

#include <QList>
#include <QString>

namespace edbee {

class TextDocument;
class TextEditorController;


class Change
{
public:

    virtual ~Change();

    virtual void execute( TextDocument* document ) = 0;
    virtual void revert( TextDocument* );

    virtual bool giveAndMerge( TextDocument* document, Change* textChange );
    virtual bool canUndo();

    virtual bool isPersistenceRequired();
    virtual TextEditorController* controllerContext();
    bool isDocumentChange();
    virtual bool isGroup();

    virtual QString toString() = 0;
};


//--------------------------------------------------------------


class DocumentChange : public Change
{
public:
};


//--------------------------------------------------------------


class EmptyDocumentChange : public Change
{
public:
    virtual bool isPersistenceRequired();
    virtual void execute( TextDocument* );
    virtual void revert( TextDocument*);
    virtual QString toString();
};


//--------------------------------------------------------------


class ControllerChange : public Change
{
public:
    ControllerChange( TextEditorController* controller );
    virtual TextEditorController* controllerContext();
    virtual TextEditorController* controller();

private:
    TextEditorController* controllerRef_;  
};


//--------------------------------------------------------------


class ChangeGroup : public ControllerChange
{
public:
    ChangeGroup( TextEditorController* controller );
    virtual ~ChangeGroup();

    virtual bool isGroup();

    virtual bool isDiscardable();
    virtual void groupClosed();

    virtual void execute( TextDocument* document);
    virtual void revert( TextDocument* document);

    virtual bool giveAndMerge( TextDocument* document, Change* textChange ) = 0;
    virtual void flatten();

    virtual void giveChange( TextDocument* doc, Change* change ) = 0;
    virtual Change* at( int idx ) = 0;
    virtual Change* take( int idx ) = 0;
    virtual int size() = 0;
    virtual void clear(bool performDelete=true) = 0;
    Change* last();
    Change* takeLast();
    int recursiveSize();

    virtual TextEditorController* controllerContext();

    virtual QString toString();

private:
    QList<Change*> changeList_;     
};



} // edbee