wxWidgets/interface/dialog.h

/////////////////////////////////////////////////////////////////////////////
// Name:        dialog.h
// Purpose:     interface of wxDialog
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxDialog
    @wxheader{dialog.h}

    A dialog box is a window with a title bar and sometimes a system menu, which
    can be moved around the screen. It can contain controls and other windows and
    is often used to allow the user to make some choice or to answer a question.

    Dialogs can be made scrollable, automatically: please see @ref
    overview_autoscrollingdialogs "Automatic scrolling dialogs" for further details.

    @beginStyleTable
    @style{wxCAPTION}:
           Puts a caption on the dialog box.
    @style{wxDEFAULT_DIALOG_STYLE}:
           Equivalent to a combination of wxCAPTION, wxCLOSE_BOX and
           wxSYSTEM_MENU (the last one is not used under Unix)
    @style{wxRESIZE_BORDER}:
           Display a resizeable frame around the window.
    @style{wxSYSTEM_MENU}:
           Display a system menu.
    @style{wxCLOSE_BOX}:
           Displays a close box on the frame.
    @style{wxMAXIMIZE_BOX}:
           Displays a maximize box on the dialog.
    @style{wxMINIMIZE_BOX}:
           Displays a minimize box on the dialog.
    @style{wxTHICK_FRAME}:
           Display a thick frame around the window.
    @style{wxSTAY_ON_TOP}:
           The dialog stays on top of all other windows.
    @style{wxNO_3D}:
           Under Windows, specifies that the child controls should not have 3D
           borders unless specified in the control.
    @style{wxDIALOG_NO_PARENT}:
           By default, a dialog created with a @NULL parent window will be
           given the application's top level window as parent. Use this style
           to prevent this from happening and create an orphan dialog. This is
           not recommended for modal dialogs.
    @style{wxDIALOG_EX_CONTEXTHELP}:
           Under Windows, puts a query button on the caption. When pressed,
           Windows will go into a context-sensitive help mode and wxWidgets
           will send a wxEVT_HELP event if the user clicked on an application
           window. Note that this is an extended style and must be set by
           calling SetExtraStyle before Create is called (two-step
           construction).
    @style{wxDIALOG_EX_METAL}:
           On Mac OS X, frames with this style will be shown with a metallic
           look. This is an extra style.
    @endStyleTable

    @library{wxcore}
    @category{cmndlg}

    @see @ref overview_wxdialogoverview, wxFrame, @ref overview_validatoroverview
    "Validator overview"
*/
class wxDialog : public wxTopLevelWindow
{
public:
    //@{
    /**
        Constructor.
        
        @param parent
            Can be @NULL, a frame or another dialog box.
        @param id
            An identifier for the dialog. A value of -1 is taken to mean a default.
        @param title
            The title of the dialog.
        @param pos
            The dialog position. The value wxDefaultPosition indicates a default position,
        chosen by
            either the windowing system or wxWidgets, depending on platform.
        @param size
            The dialog size. The value wxDefaultSize indicates a default size, chosen by
            either the windowing system or wxWidgets, depending on platform.
        @param style
            The window style. See wxDialog.
        @param name
            Used to associate a name with the window,
            allowing the application user to set Motif resource values for
            individual dialog boxes.
        
        @see Create()
    */
    wxDialog();
    wxDialog(wxWindow* parent, wxWindowID id,
             const wxString& title,
             const wxPoint& pos = wxDefaultPosition,
             const wxSize& size = wxDefaultSize,
             long style = wxDEFAULT_DIALOG_STYLE,
             const wxString& name = "dialogBox");
    //@}

    /**
        Destructor. Deletes any child windows before deleting the physical window.
    */
    ~wxDialog();

    /**
        Adds an identifier to be regarded as a main button for the non-scrolling area
        of a dialog.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    void AddMainButtonId(wxWindowID id);

    /**
        Returns @true if this dialog can and should perform layout adaptation using
        DoLayoutAdaptation(), usually if
        the dialog is too large to fit on the display.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    bool CanDoLayoutAdapation();

    /**
        Centres the dialog box on the display.
        
        @param direction
            May be wxHORIZONTAL, wxVERTICAL or wxBOTH.
    */
    void Centre(int direction = wxBOTH);

    /**
        Used for two-step dialog box construction. See wxDialog()
        for details.
    */
    bool Create(wxWindow* parent, wxWindowID id,
                const wxString& title,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = wxDEFAULT_DIALOG_STYLE,
                const wxString& name = "dialogBox");

    /**
        Creates a sizer with standard buttons. @a flags is a bit list
        of the following flags: wxOK, wxCANCEL, wxYES, wxNO, wxAPPLY, wxCLOSE,
        wxHELP, wxNO_DEFAULT.
        The sizer lays out the buttons in a manner appropriate to the platform.
        This function uses CreateStdDialogButtonSizer()
        internally for most platforms but doesn't create the sizer at all for the
        platforms with hardware buttons (such as smartphones) for which it sets up the
        hardware buttons appropriately and returns @NULL, so don't forget to test that
        the return value is valid before using it.
    */
    wxSizer* CreateButtonSizer(long flags);

    /**
        Creates a sizer with standard buttons using
        CreateButtonSizer() separated from the rest
        of the dialog contents by a horizontal wxStaticLine.
        Please notice that just like CreateButtonSizer() this function may return @c
        @NULL
        if no buttons were created.
    */
    wxSizer* CreateSeparatedButtonSizer(long flags);

    /**
        Creates a wxStdDialogButtonSizer with standard buttons. @a flags is a bit list
        of the following flags: wxOK, wxCANCEL, wxYES, wxNO, wxAPPLY, wxCLOSE,
        wxHELP, wxNO_DEFAULT.
        The sizer lays out the buttons in a manner appropriate to the platform.
    */
    wxStdDialogButtonSizer* CreateStdDialogButtonSizer(long flags);

    /**
        Performs layout adaptation, usually if the dialog is too large to fit on the
        display.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    bool DoLayoutAdapation();

    /**
        This function is called when the titlebar OK button is pressed (PocketPC only).
        A command event for the identifier returned by GetAffirmativeId is sent by
        default. You can override this function. If the function returns @false,
        wxWidgets
        will call Close() for the dialog.
    */
    virtual bool DoOK();

    /**
        A static function enabling or disabling layout adaptation for all dialogs.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    static void EnableLayoutAdaptation(bool enable);

    /**
        Ends a modal dialog, passing a value to be returned from the ShowModal()
        invocation.
        
        @param retCode
            The value that should be returned by ShowModal.
        
        @see ShowModal(), GetReturnCode(), SetReturnCode()
    */
    void EndModal(int retCode);

    /**
        Gets the identifier of the button which works like standard OK button in this
        dialog.
        
        @see SetAffirmativeId()
    */
    int GetAffirmativeId() const;

    /**
        Override this to return a window containing the main content of the dialog.
        This is
        particularly useful when the dialog implements pages, such as
        wxPropertySheetDialog,
        and allows the @ref overview_wxdialogoverview "layout adaptation code" to know
        that only the pages need to be made scrollable.
    */
    wxWindow* GetContentWindow() const;

    /**
        Gets the identifier of the button to map presses of @c ESC
        button to.
        
        @see SetEscapeId()
    */
    int GetEscapeId() const;

    /**
        Returns @true if the dialog has been adapted, usually by making it scrollable
        to work with a small display.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    bool GetLayoutAdaptationDone() const;

    /**
        Gets a value representing the aggressiveness of search for buttons and sizers
        to be in the non-scrolling part of a layout-adapted dialog.
        Zero switches off adaptation, and 3 allows search for standard buttons anywhere
        in the dialog.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    int GetLayoutAdaptationLevel();

    /**
        Gets the adaptation mode, overriding the global adaptation flag.
        See also SetLayoutAdaptationMode() and @ref overview_autoscrollingdialogs
        "Automatic scrolling dialogs".
    */
    wxDialogLayoutAdaptationMode GetLayoutAdaptationMode() const;

    /**
        A static function getting the current layout adapter object.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    static wxDialogLayoutAdapter* GetLayoutAdapter();

    /**
        Returns an array of identifiers to be regarded as the main buttons for the
        non-scrolling area of a dialog.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    wxArrayInt GetMainButtonIds();

    /**
        Gets the return code for this window.
        
        @remarks A return code is normally associated with a modal dialog, where
                 ShowModal() returns a code to the application.
        
        @see SetReturnCode(), ShowModal(), EndModal()
    */
    int GetReturnCode();

    /**
        On PocketPC, a dialog is automatically provided with an empty toolbar.
        GetToolBar
        allows you to access the toolbar and add tools to it. Removing tools and adding
        arbitrary controls are not currently supported.
        This function is not available on any other platform.
    */
    wxToolBar* GetToolBar() const;

    /**
        Iconizes or restores the dialog. Windows only.
        
        @param iconize
            If @true, iconizes the dialog box; if @false, shows and restores it.
        
        @remarks Note that in Windows, iconization has no effect since dialog
                 boxes cannot be iconized. However, applications may
                 need to explicitly restore dialog boxes under Motif
                 which have user-iconizable frames, and under Windows
                 calling Iconize(@false) will bring the window to the
                 front, as does Show(@true).
    */
    void Iconize(bool iconize);

    /**
        Returns @true if the dialog box is iconized. Windows only.
        
        @remarks Always returns @false under Windows since dialogs cannot be
                 iconized.
    */
    bool IsIconized() const;

    /**
        A static function returning @true if layout adaptation is enabled for all
        dialogs.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    static bool IsLayoutAdaptationEnabled();

    /**
        Returns @true if @a id is in the array of identifiers to be regarded as the
        main buttons for the non-scrolling area of a dialog.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    bool IsMainButton(wxWindowID& id) const;

    /**
        Returns @true if the dialog box is modal, @false otherwise.
    */
    bool IsModal() const;

    /**
        The default handler for wxEVT_SYS_COLOUR_CHANGED.
        
        @param event
            The colour change event.
        
        @remarks Changes the dialog's colour to conform to the current settings
                 (Windows only). Add an event table entry for your
                 dialog class if you wish the behaviour to be different
                 (such as keeping a user-defined background colour). If
                 you do override this function, call wxEvent::Skip to
                 propagate the notification to child windows and
                 controls.
        
        @see wxSysColourChangedEvent
    */
    void OnSysColourChanged(wxSysColourChangedEvent& event);

    /**
        Sets the identifier to be used as OK button. When the button with this
        identifier is pressed, the dialog calls wxWindow::Validate
        and wxWindow::TransferDataFromWindow
        and, if they both return @true, closes the dialog with @c wxID_OK return
        code.
        Also, when the user presses a hardware OK button on the devices having one or
        the special OK button in the PocketPC title bar, an event with this id is
        generated.
        By default, the affirmative id is wxID_OK.
        
        @see GetAffirmativeId(), SetEscapeId()
    */
    void SetAffirmativeId(int id);

    /**
        Sets the identifier of the button which should work like the standard
        @c CANCEL button in this dialog. When the button with this id is
        clicked, the dialog is closed. Also, when the user presses @c ESC
        key in the dialog or closes the dialog using the close button in the title bar,
        this is mapped to the click of the button with the specified id.
        By default, the escape id is the special value @c wxID_ANY meaning that
        @c wxID_CANCEL button is used if it's present in the dialog and
        otherwise the button with GetAffirmativeId()
        is used. Another special value for @a id is @c wxID_NONE meaning that
        @c ESC presses should be ignored. If any other value is given, it
        is interpreted as the id of the button to map the escape key to.
    */
    void SetEscapeId(int id);

    /**
        Sets the icon for this dialog.
        
        @param icon
            The icon to associate with this dialog.
    */
    void SetIcon(const wxIcon& icon);

    /**
        Sets the icons for this dialog.
        
        @param icons
            The icons to associate with this dialog.
    */
    void SetIcons(const wxIconBundle& icons);

    /**
        Marks the dialog as having been adapted, usually by making it scrollable to
        work with a small display.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    void SetLayoutAdaptationDone(bool done);

    /**
        Sets the aggressiveness of search for buttons and sizers to be in the
        non-scrolling part of a layout-adapted dialog.
        Zero switches off adaptation, and 3 allows search for standard buttons anywhere
        in the dialog.
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    void SetLayoutAdaptationLevel(int level);

    /**
        Sets the adaptation mode, overriding the global adaptation flag. @a mode may be
        one of the following values:
        
        See also @ref overview_autoscrollingdialogs "Automatic scrolling dialogs" for
        more on layout adaptation.
    */
    void SetLayoutAdaptationMode(wxDialogLayoutAdaptationMode mode);

    /**
        A static function for setting the current layout adapter object, returning the
        old adapter. If you call this, you should
        delete the old adapter object.
        See also wxDialogLayoutAdapter and @ref overview_autoscrollingdialogs
        "Automatic scrolling dialogs".
    */
    static wxDialogLayoutAdapter* SetLayoutAdapter(wxDialogLayoutAdapter* adapter);

    /**
        @b NB: This function is deprecated and doesn't work for all ports, just use
        ShowModal() to show a modal dialog instead.
        Allows the programmer to specify whether the dialog box is modal (Show() blocks
        control
        until the dialog is hidden) or modeless (control returns immediately).
        
        @param flag
            If @true, the dialog will be modal, otherwise it will be modeless.
    */
    void SetModal(bool flag);

    /**
        Sets the return code for this window.
        
        @param retCode
            The integer return code, usually a control identifier.
        
        @remarks A return code is normally associated with a modal dialog, where
                 ShowModal() returns a code to the application.
                 The function EndModal() calls SetReturnCode.
        
        @see GetReturnCode(), ShowModal(), EndModal()
    */
    void SetReturnCode(int retCode);

    /**
        Hides or shows the dialog.
        
        @param show
            If @true, the dialog box is shown and brought to the front;
            otherwise the box is hidden. If @false and the dialog is
            modal, control is returned to the calling program.
        
        @remarks The preferred way of dismissing a modal dialog is to use
                 EndModal().
    */
    bool Show(bool show);

    /**
        Shows a modal dialog. Program flow does not return until the dialog has been
        dismissed with
        EndModal().
        
        @returns The return value is the value set with SetReturnCode().
    */
    int ShowModal();
};



/**
    @class wxDialogLayoutAdapter
    @wxheader{dialog.h}

    This abstract class is the base for classes that help wxWidgets peform run-time
    layout adaptation of dialogs. Principally,
    this is to cater for small displays by making part of the dialog scroll, but
    the application developer may find other
    uses for layout adaption.

    By default, there is one instance of wxStandardDialogLayoutAdapter
    which can perform adaptation for most custom dialogs and dialogs with book
    controls
    such as wxPropertySheetDialog.

    @library{wxcore}
    @category{FIXME}

    @see @ref overview_autoscrollingdialogs "Automatic scrolling dialogs"
*/
class wxDialogLayoutAdapter
{
public:
    /**
        Default constructor.
    */
    wxDialogLayoutAdapter();

    /**
        Override this to returns @true if adaptation can and should be done.
    */
    bool CanDoLayoutAdaptation(wxDialog* dialog);

    /**
        Override this to perform layout adaptation, such as making parts of the dialog
        scroll and resizing the dialog to fit the display.
        Normally this function will be called just before the dialog is shown.
    */
    bool DoLayoutAdaptation(wxDialog* dialog);
};