/////////////////////////////////////////////////////////////////////////////
// Name:        wizard.h
// Purpose:     interface of wxWizardPage, wxWizardEvent,
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxWizardPage

    wxWizardPage is one of the screens in wxWizard: it must know what are the
    following and preceding pages (which may be @NULL for the first/last page).
    Except for this extra knowledge, wxWizardPage is just a
    panel, so the controls may be placed directly on it in the usual way.

    This class allows the programmer to decide the order of pages in the wizard
    dynamically (during run-time) and so provides maximal flexibility.
    Usually, however, the order of pages is known in advance in which case
    wxWizardPageSimple class is enough and it is simpler to use.


    @section wizardpage_virtuals Virtual functions to override

    To use this class, you must override wxWizardPage::GetPrev() and
    wxWizardPage::GetNext() pure virtual functions (or you may use
    wxWizardPageSimple instead).
    wxWizardPage::GetBitmap() can also be overridden, but this should be very
    rarely needed.

    @library{wxadv}
    @category{miscwnd}

    @see wxWizard, @ref page_samples_wizard
*/
class wxWizardPage : public wxPanel
{
public:
    /**
        Constructor accepts an optional bitmap which will be used for this page
        instead of the default one for this wizard (note that all bitmaps used should
        be of the same size). Notice that no other parameters are needed because the
        wizard will resize and reposition the page anyhow.

        @param parent
            The parent wizard
        @param bitmap
            The page-specific bitmap if different from the global one
    */
    wxWizardPage(wxWizard* parent,
                 const wxBitmap& bitmap = wxNullBitmap);

    /**
        This method is called by wxWizard to get the bitmap to display alongside the page.
        By default, @c m_bitmap member variable which was set in the
        @ref wxWizardPage() constructor.

        If the bitmap was not explicitly set (i.e. if ::wxNullBitmap is returned),
        the default bitmap for the wizard should be used.

        The only cases when you would want to override this function is if the page
        bitmap depends dynamically on the user choices, i.e. almost never.
    */
    virtual wxBitmap GetBitmap() const;

    /**
        Get the page which should be shown when the user chooses the @c "Next"
        button: if @NULL is returned, this button will be disabled.
        The last page of the wizard will usually return @NULL from here, but
        the others will not.

        @see GetPrev()
    */
    virtual wxWizardPage* GetNext() const = 0;

    /**
        Get the page which should be shown when the user chooses the @c "Back"
        button: if @NULL is returned, this button will be disabled.
        The first page of the wizard will usually return @NULL from here, but
        the others will not.

        @see GetNext()
    */
    virtual wxWizardPage* GetPrev() const = 0;
};



/**
    @class wxWizardEvent

    wxWizardEvent class represents an event generated by the wxWizard: this event
    is first sent to the page itself and, if not processed there, goes up the
    window hierarchy as usual.

    @beginEventTable{wxWizardEvent}
    @event{EVT_WIZARD_PAGE_CHANGED(id, func)}
        The page has been just changed (this event cannot be vetoed).
    @event{EVT_WIZARD_PAGE_CHANGING(id, func)}
        The page is being changed (this event can be vetoed).
    @event{EVT_WIZARD_PAGE_SHOWN(id, func)}
        The page was shown and laid out (this event cannot be vetoed).
    @event{EVT_WIZARD_CANCEL(id, func)}
        The user attempted to cancel the wizard (this event may also be vetoed).
    @event{EVT_WIZARD_HELP(id, func)}
        The wizard help button was pressed.
    @event{EVT_WIZARD_FINISHED(id, func)}
        The wizard finished button was pressed.
    @endEventTable

    @library{wxadv}
    @category{events}

    @see wxWizard, @ref page_samples_wizard
*/
class wxWizardEvent : public wxNotifyEvent
{
public:
    /**
        Constructor.

        It is not normally used by the user code as the objects of this
        type are constructed by wxWizard.
    */
    wxWizardEvent(wxEventType type = wxEVT_NULL, int id = wxID_ANY,
                  bool direction = true, wxWizardPage* page = 0);

    /**
        Return the direction in which the page is changing: for
        @c EVT_WIZARD_PAGE_CHANGING, return @true if we're going forward or
        @false otherwise and for @c EVT_WIZARD_PAGE_CHANGED return @true if we
        came from the previous page and @false if we returned from the next one.
    */
    bool GetDirection() const;

    /**
        Returns the wxWizardPage which was active when this event was generated.
    */
    wxWizardPage* GetPage() const;
};



/**
    @class wxWizardPageSimple

    wxWizardPageSimple is the simplest possible wxWizardPage implementation:
    it just returns the pointers given to its constructor from wxWizardPage::GetNext()
    and wxWizardPage::GetPrev() functions.

    This makes it very easy to use the objects of this class in the wizards where
    the pages order is known statically - on the other hand, if this is not the
    case you must derive your own class from wxWizardPage instead.

    @library{wxadv}
    @category{miscwnd}

    @see wxWizard, @ref page_samples_wizard
*/
class wxWizardPageSimple : public wxWizardPage
{
public:
    /**
        Constructor takes the previous and next pages.
        They may be modified later by SetPrev() or SetNext().
    */
    wxWizardPageSimple(wxWizard* parent,
                       wxWizardPage* prev = NULL,
                       wxWizardPage* next = NULL,
                       const wxBitmap& bitmap = wxNullBitmap);

    /**
        A convenience function to make the pages follow each other.
        Example:

        @code
        wxRadioboxPage *page3 = new wxRadioboxPage(wizard);
        wxValidationPage *page4 = new wxValidationPage(wizard);

        wxWizardPageSimple::Chain(page3, page4);
        @endcode
    */
    static void Chain(wxWizardPageSimple* first,
                      wxWizardPageSimple* second);

    /**
        Sets the next page.
    */
    void SetNext(wxWizardPage* next);

    /**
        Sets the previous page.
    */
    void SetPrev(wxWizardPage* prev);
};



/**
    @class wxWizard

    wxWizard is the central class for implementing 'wizard-like' dialogs.
    These dialogs are mostly familiar to Windows users and are nothing other than a
    sequence of 'pages', each displayed inside a dialog which has the buttons to
    navigate to the next (and previous) pages.

    The wizards are typically used to decompose a complex dialog into several
    simple steps and are mainly useful to the novice users, hence it is important
    to keep them as simple as possible.

    To show a wizard dialog, you must first create an instance of the wxWizard class
    using either the non-default constructor or a default one followed by call to the
    wxWizard::Create function. Then you should add all pages you want the wizard to
    show and call wxWizard::RunWizard().
    Finally, don't forget to call @c "wizard->Destroy()", otherwise your application
    will hang on exit due to an undestroyed window.

    You can supply a bitmap to display on the left of the wizard, either for all pages
    or for individual pages. If you need to have the bitmap resize to the height of
    the wizard, call wxWizard::SetBitmapPlacement() and if necessary,
    wxWizard::SetBitmapBackgroundColour() and wxWizard::SetMinimumBitmapWidth().

    To make wizard pages scroll when the display is too small to fit the whole
    dialog, you can switch layout adaptation on globally with
    wxDialog::EnableLayoutAdaptation() or per dialog with wxDialog::SetLayoutAdaptationMode().
    For more about layout adaptation, see @ref overview_dialog_autoscrolling.

    @beginEventEmissionTable{wxWizardEvent}
    For some events, Veto() can be called to prevent the event from happening.
    @event{EVT_WIZARD_PAGE_CHANGED(id, func)}
        The page has just been changed (this event cannot be vetoed).
    @event{EVT_WIZARD_PAGE_CHANGING(id, func)}
        The page is being changed (this event can be vetoed).
    @event{EVT_WIZARD_PAGE_SHOWN(id, func)}
        The page was shown and laid out (this event cannot be vetoed).
    @event{EVT_WIZARD_CANCEL(id, func)}
        The user attempted to cancel the wizard (this event may also be vetoed).
    @event{EVT_WIZARD_HELP(id, func)}
        The wizard help button was pressed.
    @event{EVT_WIZARD_FINISHED(id, func)}
        The wizard finished button was pressed.
    @endEventTable


    @section wizard_extstyles Extended styles

    Use the wxWindow::SetExtraStyle() function to set the following style.
    You will need to use two-step construction (use the default constructor,
    call SetExtraStyle(), then call Create).

    @beginExtraStyleTable
    @style{wxWIZARD_EX_HELPBUTTON}
        Shows a Help button using wxID_HELP.
    @endExtraStyleTable

    See also wxDialog for other extended styles.

    @library{wxadv}
    @category{cmndlg}

    @see wxWizardEvent, wxWizardPage, @ref page_samples_wizard
*/
class wxWizard : public wxDialog
{
public:
    /**
        Default constructor.

        Use this if you wish to derive from wxWizard and then call Create(),
        for example if you wish to set an extra style with wxWindow::SetExtraStyle()
        between the two calls.
    */
    wxWizard();

    /**
        Constructor which really creates the wizard -- if you use this constructor, you
        shouldn't call Create().

        Notice that unlike almost all other wxWidgets classes, there is no @e size
        parameter in the wxWizard constructor because the wizard will have a predefined
        default size by default.
        If you want to change this, you should use the GetPageAreaSizer() function.

        @param parent
            The parent window, may be @NULL.
        @param id
            The id of the dialog, will usually be just wxID_ANY.
        @param title
            The title of the dialog.
        @param bitmap
            The default bitmap used in the left side of the wizard. See also GetBitmap().
        @param pos
            The position of the dialog, it will be centered on the screen by default.
        @param style
            Window style is passed to wxDialog.
    */
    wxWizard(wxWindow* parent, int id = wxID_ANY,
             const wxString& title = wxEmptyString,
             const wxBitmap& bitmap = wxNullBitmap,
             const wxPoint& pos = wxDefaultPosition,
             long style = wxDEFAULT_DIALOG_STYLE);

    /**
        Creates the wizard dialog.
        Must be called if the default constructor had been used to create the object.

        Notice that unlike almost all other wxWidgets classes, there is no @e size
        parameter in the wxWizard constructor because the wizard will have a predefined
        default size by default.
        If you want to change this, you should use the GetPageAreaSizer() function.

        @param parent
            The parent window, may be @NULL.
        @param id
            The id of the dialog, will usually be just -1.
        @param title
            The title of the dialog.
        @param bitmap
            The default bitmap used in the left side of the wizard. See also GetBitmap().
        @param pos
            The position of the dialog, it will be centered on the screen by default.
        @param style
            Window style is passed to wxDialog.
    */
    bool Create(wxWindow* parent, int id = wxID_ANY,
                const wxString& title = wxEmptyString,
                const wxBitmap& bitmap = wxNullBitmap,
                const wxPoint& pos = wxDefaultPosition, long style = 536877056);

    /**
        This method is obsolete, use GetPageAreaSizer() instead.

        Sets the page size to be big enough for all the pages accessible via the
        given @e firstPage, i.e. this page, its next page and so on.

        This method may be called more than once and it will only change the page size
        if the size required by the new page is bigger than the previously set one.
        This is useful if the decision about which pages to show is taken during
        run-time, as in this case, the wizard won't be able to get to all pages starting
        from a single one and you should call @e Fit separately for the others.
    */
    virtual void FitToPage(const wxWizardPage* firstPage);

    /**
        Returns the bitmap used for the wizard.
    */
    const wxBitmap& GetBitmap() const;

    /**
        Returns the colour that should be used to fill the area not taken up by the
        wizard or page bitmap, if a non-zero bitmap placement flag has been set.

        See also SetBitmapPlacement().
    */
    const wxColour& GetBitmapBackgroundColour() const;

    /**
        Returns the flags indicating how the wizard or page bitmap should be expanded
        and positioned to fit the page height. By default, placement is 0 (no expansion is done).

        See also SetBitmapPlacement() for the possible values.
    */
    int GetBitmapPlacement() const;

    /**
        Get the current page while the wizard is running.
        @NULL is returned if RunWizard() is not being executed now.
    */
    virtual wxWizardPage* GetCurrentPage() const;

    /**
        Returns the minimum width for the bitmap that will be constructed to contain
        the actual wizard or page bitmap if a non-zero bitmap placement flag has been set.

        See also SetBitmapPlacement().
    */
    int GetMinimumBitmapWidth() const;

    /**
        Returns pointer to page area sizer. The wizard is laid out using sizers and
        the page area sizer is the place-holder for the pages. All pages are resized
        before being shown to match the wizard page area.

        Page area sizer has a minimal size that is the maximum of several values.
        First, all pages (or other objects) added to the sizer. Second, all pages reachable
        by repeatedly applying wxWizardPage::GetNext() to any page inserted into the sizer.

        Third, the minimal size specified using SetPageSize() and FitToPage().
        Fourth, the total wizard height may be increased to accommodate the bitmap height.
        Fifth and finally, wizards are never smaller than some built-in minimal size to
        avoid wizards that are too small.

        The caller can use wxSizer::SetMinSize to enlarge it beyond the minimal size.
        If @c wxRESIZE_BORDER was passed to constructor, user can resize wizard and
        consequently the page area (but not make it smaller than the minimal size).

        It is recommended to add the first page to the page area sizer.
        For simple wizards, this will enlarge the wizard to fit the biggest page.

        For non-linear wizards, the first page of every separate chain should be added.
        Caller-specified size can be accomplished using wxSizer::SetMinSize().
        Adding pages to the page area sizer affects the default border width around page
        area that can be altered with SetBorder().
    */
    virtual wxSizer* GetPageAreaSizer() const;

    /**
        Returns the size available for the pages.
    */
    virtual wxSize GetPageSize() const;

    /**
        Return @true if this page is not the last one in the wizard.
        The base class version implements this by calling
        @ref wxWizardPage::GetNext "page->GetNext" but this could be
        undesirable if, for example, the pages are created on demand only.

        @see HasPrevPage()
    */
    virtual bool HasNextPage(wxWizardPage* page);

    /**
        Returns @true if this page is not the last one in the wizard.
        The base class version implements this by calling
        @ref wxWizardPage::GetPrev "page->GetPrev" but this could be
        undesirable if, for example, the pages are created on demand only.

        @see HasNextPage()
    */
    virtual bool HasPrevPage(wxWizardPage* page);

    /**
        Executes the wizard starting from the given page, returning @true if it was
        successfully finished or @false if user cancelled it.
        The @a firstPage cannot be @NULL.
    */
    virtual bool RunWizard(wxWizardPage* firstPage);

    /**
        Sets the bitmap used for the wizard.
    */
    void SetBitmap(const wxBitmap& bitmap);

    /**
        Sets the colour that should be used to fill the area not taken up by the wizard
        or page bitmap, if a non-zero bitmap placement flag has been set.

        See also SetBitmapPlacement().
    */
    void SetBitmapBackgroundColour(const wxColour& colour);

    /**
        Sets the flags indicating how the wizard or page bitmap should be expanded and
        positioned to fit the page height.

        By default, placement is 0 (no expansion is done). @a placement is a bitlist with the
        following possible values:

        - @b wxWIZARD_VALIGN_TOP: Aligns the bitmap at the top.
        - @b wxWIZARD_VALIGN_CENTRE: Centres the bitmap vertically.
        - @b wxWIZARD_VALIGN_BOTTOM: Aligns the bitmap at the bottom.
        - @b wxWIZARD_HALIGN_LEFT: Left-aligns the bitmap.
        - @b wxWIZARD_HALIGN_CENTRE: Centres the bitmap horizontally.
        - @b wxWIZARD_HALIGN_RIGHT: Right-aligns the bitmap.
        - @b wxWIZARD_TILE: @todo describe this

        See also SetMinimumBitmapWidth().
    */
    void SetBitmapPlacement(int placement);

    /**
        Sets width of border around page area. Default is zero.
        For backward compatibility, if there are no pages in GetPageAreaSizer(),
        the default is 5 pixels.

        If there is a five point border around all controls in a page and the border
        around page area is left as zero, a five point white space along all dialog borders
        will be added to the control border in order to space page controls ten points
        from the dialog border and non-page controls.
    */
    virtual void SetBorder(int border);

    /**
        Sets the minimum width for the bitmap that will be constructed to contain the
        actual wizard or page bitmap if a non-zero bitmap placement flag has been set.
        If this is not set when using bitmap placement, the initial layout may be incorrect.

        See also SetBitmapPlacement().
    */
    void SetMinimumBitmapWidth(int width);

    /**
        Sets the minimal size to be made available for the wizard pages.
        The wizard will take into account the size of the bitmap (if any) itself.
        Also, the wizard will never be smaller than the default size.

        The recommended way to use this function is to lay out all wizard pages
        using the sizers (even though the wizard is not resizable) and then use
        wxSizer::CalcMin() in a loop to calculate the maximum of minimal sizes of
        the pages and pass it to SetPageSize().
    */
    virtual void SetPageSize(const wxSize& sizePage);
};

