wxWidgets/interface/wx/slider.h

/////////////////////////////////////////////////////////////////////////////
// Name:        slider.h
// Purpose:     interface of wxSlider
// Author:      wxWidgets team
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////


#define wxSL_HORIZONTAL      wxHORIZONTAL /* 0x0004 */
#define wxSL_VERTICAL        wxVERTICAL   /* 0x0008 */

#define wxSL_TICKS           0x0010
#define wxSL_AUTOTICKS       wxSL_TICKS // we don't support manual ticks
#define wxSL_LEFT            0x0040
#define wxSL_TOP             0x0080
#define wxSL_RIGHT           0x0100
#define wxSL_BOTTOM          0x0200
#define wxSL_BOTH            0x0400
#define wxSL_SELRANGE        0x0800
#define wxSL_INVERSE         0x1000
#define wxSL_MIN_MAX_LABELS  0x2000
#define wxSL_VALUE_LABEL     0x4000
#define wxSL_LABELS          (wxSL_MIN_MAX_LABELS|wxSL_VALUE_LABEL)

/**
    @class wxSlider

    A slider is a control with a handle which can be pulled back and forth to
    change the value.

    On Windows, the track bar control is used.

    Slider generates the same events as wxScrollBar but in practice the most
    convenient way to process wxSlider updates is by handling the
    slider-specific @c wxEVT_SLIDER event which carries wxCommandEvent
    containing just the latest slider position.

    @beginStyleTable
    @style{wxSL_HORIZONTAL}
           Displays the slider horizontally (this is the default).
    @style{wxSL_VERTICAL}
           Displays the slider vertically.
    @style{wxSL_AUTOTICKS}
           Displays tick marks. Windows only.
    @style{wxSL_MIN_MAX_LABELS}
           Displays minimum, maximum labels (new since wxWidgets 2.9.1).
    @style{wxSL_VALUE_LABEL}
           Displays value label (new since wxWidgets 2.9.1).
    @style{wxSL_LABELS}
           Displays minimum, maximum and value labels (same as wxSL_VALUE_LABEL
           and wxSL_MIN_MAX_LABELS together).
    @style{wxSL_LEFT}
           Displays ticks on the left and forces the slider to be vertical.
    @style{wxSL_RIGHT}
           Displays ticks on the right and forces the slider to be vertical.
    @style{wxSL_TOP}
           Displays ticks on the top.
    @style{wxSL_BOTTOM}
           Displays ticks on the bottom (this is the default).
    @style{wxSL_SELRANGE}
           Allows the user to select a range on the slider. Windows only.
    @style{wxSL_INVERSE}
           Inverses the minimum and maximum endpoints on the slider. Not
           compatible with wxSL_SELRANGE.
    @endStyleTable

    Notice that @c wxSL_LEFT, @c wxSL_TOP, @c wxSL_RIGHT and @c wxSL_BOTTOM
    specify the position of the slider ticks in MSW implementation and that the
    slider labels, if any, are positioned on the opposite side. So, to have a
    label on the left side of a vertical slider, @b wxSL_RIGHT must be used (or
    none of these styles at all should be specified as left and top are default
    positions for the vertical and horizontal sliders respectively).

    @beginEventEmissionTable{wxScrollEvent}
    You can use EVT_COMMAND_SCROLL... macros with window IDs for when intercepting
    scroll events from controls, or EVT_SCROLL... macros without window IDs for
    intercepting scroll events from the receiving window -- except for this,
    the macros behave exactly the same.
    @event{EVT_SCROLL(func)}
        Process all scroll events.
    @event{EVT_SCROLL_TOP(func)}
        Process @c wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
    @event{EVT_SCROLL_BOTTOM(func)}
        Process @c wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
    @event{EVT_SCROLL_LINEUP(func)}
        Process @c wxEVT_SCROLL_LINEUP line up events.
    @event{EVT_SCROLL_LINEDOWN(func)}
        Process @c wxEVT_SCROLL_LINEDOWN line down events.
    @event{EVT_SCROLL_PAGEUP(func)}
        Process @c wxEVT_SCROLL_PAGEUP page up events.
    @event{EVT_SCROLL_PAGEDOWN(func)}
        Process @c wxEVT_SCROLL_PAGEDOWN page down events.
    @event{EVT_SCROLL_THUMBTRACK(func)}
        Process @c wxEVT_SCROLL_THUMBTRACK thumbtrack events
        (frequent events sent as the user drags the thumbtrack).
    @event{EVT_SCROLL_THUMBRELEASE(func)}
        Process @c wxEVT_SCROLL_THUMBRELEASE thumb release events.
    @event{EVT_SCROLL_CHANGED(func)}
        Process @c wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).
    @event{EVT_COMMAND_SCROLL(id, func)}
        Process all scroll events.
    @event{EVT_COMMAND_SCROLL_TOP(id, func)}
        Process @c wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
    @event{EVT_COMMAND_SCROLL_BOTTOM(id, func)}
        Process @c wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
    @event{EVT_COMMAND_SCROLL_LINEUP(id, func)}
        Process @c wxEVT_SCROLL_LINEUP line up events.
    @event{EVT_COMMAND_SCROLL_LINEDOWN(id, func)}
        Process @c wxEVT_SCROLL_LINEDOWN line down events.
    @event{EVT_COMMAND_SCROLL_PAGEUP(id, func)}
        Process @c wxEVT_SCROLL_PAGEUP page up events.
    @event{EVT_COMMAND_SCROLL_PAGEDOWN(id, func)}
        Process @c wxEVT_SCROLL_PAGEDOWN page down events.
    @event{EVT_COMMAND_SCROLL_THUMBTRACK(id, func)}
        Process @c wxEVT_SCROLL_THUMBTRACK thumbtrack events
        (frequent events sent as the user drags the thumbtrack).
    @event{EVT_COMMAND_SCROLL_THUMBRELEASE(func)}
        Process @c wxEVT_SCROLL_THUMBRELEASE thumb release events.
    @event{EVT_COMMAND_SCROLL_CHANGED(func)}
        Process @c wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).
    @event{EVT_SLIDER(id, func)}
        Process @c wxEVT_SLIDER which is generated after any
        change of wxSlider position in addition to one of the events above.
        Notice that the handler of this event receives a wxCommandEvent as
        argument and not wxScrollEvent, as all the other handlers.
    @endEventTable

    @section slider_diff The difference between EVT_SCROLL_THUMBRELEASE and EVT_SCROLL_CHANGED

    The EVT_SCROLL_THUMBRELEASE event is only emitted when actually dragging the
    thumb using the mouse and releasing it (This EVT_SCROLL_THUMBRELEASE event
    is also followed by an EVT_SCROLL_CHANGED event).

    The EVT_SCROLL_CHANGED event also occurs when using the keyboard to change
    the thumb position, and when clicking next to the thumb
    (In all these cases the EVT_SCROLL_THUMBRELEASE event does not happen).
    In short, the EVT_SCROLL_CHANGED event is triggered when scrolling/ moving
    has finished independently of the way it had started.
    Please see the widgets sample ("Slider" page) to see the difference between
    EVT_SCROLL_THUMBRELEASE and EVT_SCROLL_CHANGED in action.

    @library{wxcore}
    @category{ctrl}
    @appearance{slider}

    @see @ref overview_events, wxScrollBar
*/
class wxSlider : public wxControl
{
public:
    /**
       Default constructor
    */
    wxSlider();

    /**
        Constructor, creating and showing a slider.

        @param parent
            Parent window. Must not be @NULL.
        @param id
            Window identifier. The value wxID_ANY indicates a default value.
        @param value
            Initial position for the slider.
        @param minValue
            Minimum slider position.
        @param maxValue
            Maximum slider position.
        @param pos
            Window position. 
            If ::wxDefaultPosition is specified then a default position is chosen.
        @param size
            Window size. 
            If ::wxDefaultSize is specified then a default size is chosen.
        @param style
            Window style. See wxSlider.
        @param validator
            Window validator.
        @param name
            Window name.

        @see Create(), wxValidator
    */
    wxSlider(wxWindow* parent, wxWindowID id, int value,
             int minValue, int maxValue,
             const wxPoint& pos = wxDefaultPosition,
             const wxSize& size = wxDefaultSize,
             long style = wxSL_HORIZONTAL,
             const wxValidator& validator = wxDefaultValidator,
             const wxString& name = wxSliderNameStr);

    /**
        Destructor, destroying the slider.
    */
    virtual ~wxSlider();

    /**
        Clears the selection, for a slider with the @b wxSL_SELRANGE style.

        @onlyfor{wxmsw}
    */
    virtual void ClearSel();

    /**
        Clears the ticks.

        @onlyfor{wxmsw}
    */
    virtual void ClearTicks();

    /**
        Used for two-step slider construction.
        See wxSlider() for further details.
    */
    bool Create(wxWindow* parent, wxWindowID id, int value, int minValue,
                int maxValue, const wxPoint& point = wxDefaultPosition,
                const wxSize& size = wxDefaultSize, long style = wxSL_HORIZONTAL,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = wxSliderNameStr);

    /**
        Returns the line size.

        @see SetLineSize()
    */
    virtual int GetLineSize() const;

    /**
        Gets the maximum slider value.

        @see GetMin(), SetRange()
    */
    virtual int GetMax() const;

    /**
        Gets the minimum slider value.

        @see GetMin(), SetRange()
    */
    virtual int GetMin() const;

    /**
        Returns the page size.

        @see SetPageSize()
    */
    virtual int GetPageSize() const;

    /**
        Returns the selection end point.

        @onlyfor{wxmsw}

        @see GetSelStart(), SetSelection()
    */
    virtual int GetSelEnd() const;

    /**
        Returns the selection start point.

        @onlyfor{wxmsw}

        @see GetSelEnd(), SetSelection()
    */
    virtual int GetSelStart() const;

    /**
        Returns the thumb length.

        @onlyfor{wxmsw}

        @see SetThumbLength()
    */
    virtual int GetThumbLength() const;

    /**
        Returns the tick frequency.

        @onlyfor{wxmsw}

        @see SetTickFreq()
    */
    virtual int GetTickFreq() const;

    /**
        Gets the current slider value.

        @see GetMin(), GetMax(), SetValue()
    */
    virtual int GetValue() const;

    /**
        Sets the line size for the slider.

        @param lineSize
            The number of steps the slider moves when the user moves it up
            or down a line.

        @see GetLineSize()
    */
    virtual void SetLineSize(int lineSize);


    /**
        Sets the minimum slider value.

        @param minValue
            The new bottom end of the slider range.
            
        @see GetMin(), SetRange()
    */
    void SetMin( int minValue );

    /**
        Sets the maximum slider value.

        @param maxValue
            The new top end of the slider range.
            
        @see GetMax(), SetRange()
    */
    void SetMax( int maxValue );

    /**
        Sets the page size for the slider.

        @param pageSize
            The number of steps the slider moves when the user pages up or down.

        @see GetPageSize()
    */
    virtual void SetPageSize(int pageSize);

    /**
        Sets the minimum and maximum slider values.

        @see GetMin(), GetMax()
    */
    virtual void SetRange(int minValue, int maxValue);

    /**
        Sets the selection.

        @param startPos
            The selection start position.
        @param endPos
            The selection end position.

        @onlyfor{wxmsw}

        @see GetSelStart(), GetSelEnd()
    */
    virtual void SetSelection(int startPos, int endPos);

    /**
        Sets the slider thumb length.

        @param len
            The thumb length.

        @onlyfor{wxmsw}

        @see GetThumbLength()
    */
    virtual void SetThumbLength(int len);

    /**
        Sets a tick position.

        @param tickPos
            The tick position.

        @onlyfor{wxmsw}

        @see SetTickFreq()
    */
    virtual void SetTick(int tickPos);

    /**
        Sets the tick mark frequency and position.

        @param n
            Frequency. For example, if the frequency is set to two, a tick mark is
            displayed for every other increment in the slider's range.

        @onlyfor{wxmsw}

        @see GetTickFreq()
    */
    virtual void SetTickFreq(int n);

    /**
        Sets the slider position.

        @param value
            The slider position.
    */
    virtual void SetValue(int value);
};