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/*
Crystal Space Windowing System: scroll bar class
Copyright (C) 1998,1999 by Andrew Zabolotny <bit@eltech.ru>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CSSCRBAR_H__
#define __CSSCRBAR_H__
#include "cscomp.h"
#include "csbutton.h"
#include "cstimer.h"
/// Recommended scroll bar size (width or height)
#define CSSB_DEFAULTSIZE (3+3+9)
/// Possible scrollbar frame styles
enum csScrollBarFrameStyle
{
/// Scroll bar has a thick rectangular frame
cssfsThickRect,
/// Scroll bar has a thin rectangular frame
cssfsThinRect
};
/// Scroll bar range structure
struct csScrollBarStatus
{
/// Knob position and max position
int value, maxvalue;
/// Knob size and max size
int size, maxsize;
/// Scroll bar jump steps
int step, pagestep;
};
/// csScrollBar class messages
enum
{
/**
* Set scroll bar range, value etc.
* <pre>
* IN: (csScrollBarStatus *)status
* OUT: NULL if successful
* </pre>
*/
cscmdScrollBarSet = 0x00000600,
/**
* Query scroll bar status
* <pre>
* IN: (csScrollBarStatus *)status
* OUT: NULL if successful
* </pre>
*/
cscmdScrollBarGetStatus,
/**
* Scroll bar value changed (parent notification)
* <pre>
* IN: (csScrollBar *)source
* </pre>
*/
cscmdScrollBarValueChanged,
/**
* Query just the scroll bar value
* <pre>
* OUT: (int)value
* </pre>
*/
cscmdScrollBarQueryValue,
/**
* Set just the scroll bar value
* <pre>
* IN: (int)value
* </pre>
*/
cscmdScrollBarSetValue
};
/**
* The ScrollBar component class is used to scroll left/right or
* up/down windows whose content does not fit into their size.
* If scroll bar's width is bigger than its height, it becomes a
* horizontal scroll bar, otherwise it is a vertical scroll bar.
* A scroll bar notifies its parent with a command event when
* user requests (using mouse) to scroll window contents.
* Parent can set scroll bar's position/range using command
* messages.
*/
class csScrollBar : public csComponent
{
/// Scroll bar frame style
csScrollBarFrameStyle FrameStyle;
/// The scroll buttons and the scroller
csButton *topleft, *botright, *scroller;
/// The repeat timer
csTimer *timer;
/// Active button ID
int active_button;
/// true if scroll bar is horizontal
bool IsHorizontal;
/// true if tracking scroller
bool TrackScroller;
/// Scroller tracking initial position
int scrollerdx, scrollerdy;
/// Length of active portion of scrollbar
int activepixlen;
/// Images of arrows
static csPixmap *sprarrows[12];
/// Image of scroller
static csPixmap *sprscroller[2];
/// Current scroll bar status
csScrollBarStatus status;
public:
/// Create static component object (by default - a label) linked to another
csScrollBar (csComponent *iParent, csScrollBarFrameStyle iFrameStyle = cssfsThickRect);
/// Destroy the scroll bar
virtual ~csScrollBar ();
/// Handle scroll button notifications
virtual bool HandleEvent (iEvent &Event);
/// Set scroll button positions on resize
virtual bool SetRect (int xmin, int ymin, int xmax, int ymax);
/// Override SetState method to disable scroll buttons as well
virtual void SetState (int mask, bool enable);
/**
* Accessors
*/
/// Get frame style
csScrollBarFrameStyle GetFrameStyle()
{ return FrameStyle; }
/// Get active button
int GetActiveButton()
{ return active_button; }
/// Returns true if scrollbar is horizontal
bool GetIsHorizontal()
{ return IsHorizontal; }
/// Get the scroller button
csButton *GetScroller()
{ return scroller; }
/// Get the top or left arrow button
csButton *GetTopLeft()
{ return topleft; }
/// Get the bottom or right arrow button
csButton *GetBotRight()
{ return botright; }
/// Get the name of the skip slice for this component
virtual char *GetSkinName ()
{ return "ScrollBar"; }
protected:
/// Set scroll bar value
void SetValue (int iValue);
};
#endif // __CSSCRBAR_H__
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