kits/interface/ScrollBar.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2001-2002, OpenBeOS
//
//	Permission is hereby granted, free of charge, to any person obtaining a
//	copy of this software and associated documentation files (the "Software"),
//	to deal in the Software without restriction, including without limitation
//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
//	and/or sell copies of the Software, and to permit persons to whom the
//	Software is furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in
//	all copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		ScrollBar.cpp
//	Author:			Marc Flerackers (mflerackers@androme.be)
//					DarkWyrm (bpmagic@columbus.rr.com)
//	Description:	Client-side class for scrolling
//
//------------------------------------------------------------------------------

#include <Message.h>
#include <Rect.h>
#include <stdio.h>
#include <string.h>
#include <OS.h>
#include <Window.h>
#include <ScrollBar.h>

//#define TEST_MODE

typedef enum
{
	ARROW_LEFT=0,
	ARROW_RIGHT,
	ARROW_UP,
	ARROW_DOWN,
	ARROW_NONE
} arrow_direction;

#define SBC_SCROLLBYVALUE 0
#define SBC_SETDOUBLE 1
#define SBC_SETPROPORTIONAL 2
#define SBC_SETSTYLE 3

// Quick constants for determining which arrow is down and are defined with respect
// to double arrow mode. ARROW1 and ARROW4 refer to the outer pair of arrows and
// ARROW2 and ARROW3 refer to the inner ones. ARROW1 points left/up and ARROW4
// points right/down.
#define ARROW1 0
#define ARROW2 1
#define ARROW3 2
#define ARROW4 3
#define NOARROW -1

// Because the R5 version kept a lot of data on server-side, we need to kludge our way
// into binary compatibility
class BScrollBarPrivateData
{
public:
	BScrollBarPrivateData(void)
	{
		thumbframe.Set(0,0,B_V_SCROLL_BAR_WIDTH,B_H_SCROLL_BAR_HEIGHT);
		enabled=true;
		tracking=false;
		mousept.Set(0,0);
		thumbinc=1.0;
		repeaterid=-1;
		exit_repeater=false;
		arrowdown=ARROW_NONE;
		buttondown=NOARROW;

		#ifdef TEST_MODE
			sbinfo.proportional=true;
			sbinfo.double_arrows=false;
			sbinfo.knob=0;
			sbinfo.min_knob_size=14;
		#else
			get_scroll_bar_info(&sbinfo);
		#endif
	}

	~BScrollBarPrivateData(void)
	{
		if(repeaterid!=-1)
		{
			exit_repeater=false;
			kill_thread(repeaterid);
		}
	}
	void DrawScrollBarButton(BScrollBar *owner, arrow_direction direction,
		const BPoint &offset, bool down=false);
	static int32 ButtonRepeaterThread(void *data);


	thread_id repeaterid;
	scroll_bar_info sbinfo;
	BRect thumbframe;
	bool enabled;
	bool tracking;
	BPoint mousept;
	float thumbinc;
	bool exit_repeater;
	arrow_direction arrowdown;
	int8 buttondown;
};

// This thread is spawned when a button is initially pushed and repeatedly scrolls
// the scrollbar by a little bit after a short delay
int32 BScrollBarPrivateData::ButtonRepeaterThread(void *data)
{
	BScrollBar *sb=(BScrollBar *)data;
	BRect oldframe(sb->privatedata->thumbframe);
//	BRect update(sb->privatedata->thumbframe);

	snooze(250000);

	bool exitval=false;
	status_t returnval;

	sb->Window()->Lock();
	exitval=sb->privatedata->exit_repeater;
	sb->Window()->Unlock();

	float scrollvalue;

	if(sb->privatedata->arrowdown==ARROW_LEFT || sb->privatedata->arrowdown==ARROW_UP)
		scrollvalue=-sb->fSmallStep;
	else
	if(sb->privatedata->arrowdown!=ARROW_NONE)
		scrollvalue=sb->fSmallStep;
	else
		exitval=true;

	while(!exitval)
	{
		oldframe=sb->privatedata->thumbframe;

		returnval=control_scrollbar(SBC_SCROLLBYVALUE, &scrollvalue, sb);

		snooze(50000);

		sb->Window()->Lock();
		exitval=sb->privatedata->exit_repeater;

		if(returnval==B_OK)
		{
			sb->CopyBits(oldframe,sb->privatedata->thumbframe);

			// TODO: Redraw the old area here

			sb->ValueChanged(sb->fValue);
		}
		sb->Window()->Unlock();
	}

	sb->Window()->Lock();
	sb->privatedata->exit_repeater=false;
	sb->privatedata->repeaterid=-1;
	sb->Window()->Unlock();
	return 0;
	exit_thread(0);
}

BScrollBar::BScrollBar(BRect frame,const char *name,BView *target,float min,
		float max,orientation direction)
 : BView(frame, name, B_FOLLOW_NONE, B_WILL_DRAW)
{
	SetViewColor(ui_color(B_PANEL_BACKGROUND_COLOR));
	fMin=min;
	fMax=max;
	fOrientation=direction;
	fValue=0;
	fSmallStep=1.0;
	fLargeStep=10.0;
	fTarget=target;
	privatedata=new BScrollBarPrivateData;

	if(fTarget)
	{
		fTargetName=new char[strlen(fTarget->Name()+1)];
		strcpy(fTargetName,target->Name());

		// TODO: theoretically, we should also set the target BView's scrollbar
		// pointer here
	}
	else
		fTargetName=NULL;

	if(direction==B_VERTICAL)
	{
		if(frame.Width()>B_V_SCROLL_BAR_WIDTH)
			ResizeTo(B_V_SCROLL_BAR_WIDTH,frame.Height()+1);

		privatedata->thumbframe.bottom=privatedata->sbinfo.min_knob_size;
		if(privatedata->sbinfo.double_arrows)
			privatedata->thumbframe.OffsetBy(0,(B_H_SCROLL_BAR_HEIGHT+1)*2);
		else
			privatedata->thumbframe.OffsetBy(0,B_H_SCROLL_BAR_HEIGHT+1);
	}
	else
	{
		if(frame.Height()>B_H_SCROLL_BAR_HEIGHT)
			ResizeTo(frame.Width()+1,B_H_SCROLL_BAR_HEIGHT);

		privatedata->thumbframe.right=privatedata->sbinfo.min_knob_size;
		if(privatedata->sbinfo.double_arrows)
			privatedata->thumbframe.OffsetBy((B_V_SCROLL_BAR_WIDTH+1)*2,0);
		else
			privatedata->thumbframe.OffsetBy(B_V_SCROLL_BAR_WIDTH+1,0);
	}


	SetResizingMode( (direction==B_VERTICAL)?
		B_FOLLOW_TOP_BOTTOM | B_FOLLOW_RIGHT :
		B_FOLLOW_LEFT_RIGHT | B_FOLLOW_BOTTOM );

}

BScrollBar::BScrollBar(BMessage *data)
 : BView(data)
{
}

BScrollBar::~BScrollBar()
{
	delete privatedata;
	if(fTargetName)
		delete fTargetName;

	// TODO: Disconnect from target
}

BArchivable *BScrollBar::Instantiate(BMessage *data)
{
	// TODO: Implement
	return NULL;
}

status_t BScrollBar::Archive(BMessage *data, bool deep) const
{
	BView::Archive(data,deep);
	data->AddFloat("_range",fMin);
	data->AddFloat("_range",fMax);
	data->AddFloat("_steps",fSmallStep);
	data->AddFloat("_steps",fLargeStep);
	data->AddFloat("_val",fValue);
	data->AddInt32("_orient",(int32)fOrientation);
	data->AddInt32("_prop",fProportion);

	return B_OK;
}

void BScrollBar::AttachedToWindow()
{
	// R5's SB contacts the server if fValue!=0. I *think* we don't need to do anything here...
}

void BScrollBar::SetValue(float value)
{
	if(value>fMax)
		value=fMax;
	if(value<fMin)
		value=fMin;

	fValue=value;
	if(Window())
		Draw(Bounds());

	ValueChanged(fValue);
}

float BScrollBar::Value() const
{
	return fValue;
}

void BScrollBar::SetProportion(float value)
{
	fProportion=value;
}

float BScrollBar::Proportion() const
{
	return fProportion;
}

void BScrollBar::ValueChanged(float newValue)
{
	// TODO: Implement
/*
	From the BeBook:

Responds to a notification that the value of the scroll bar has changed to
newValue. For a horizontal scroll bar, this function interprets newValue
as the coordinate value that should be at the left side of the target
view's bounds rectangle. For a vertical scroll bar, it interprets
newValue as the coordinate value that should be at the top of the rectangle.
It calls ScrollTo() to scroll the target's contents into position, unless
they have already been scrolled.

ValueChanged() is called as the result both of user actions
(B_VALUE_CHANGED messages received from the Application Server) and of
programmatic ones. Programmatically, scrolling can be initiated by the
target view (calling ScrollTo()) or by the BScrollBar
(calling SetValue() or SetRange()).

In all these cases, the target view and the scroll bars need to be kept
in synch. This is done by a chain of function calls: ValueChanged() calls
ScrollTo(), which in turn calls SetValue(), which then calls
ValueChanged() again. It's up to ValueChanged() to get off this
merry-go-round, which it does by checking the target view's bounds
rectangle. If newValue already matches the left or top side of the
bounds rectangle, if forgoes calling ScrollTo().

ValueChanged() does nothing if a target BView hasn't been set—or
if the target has been set by name, but the name doesn't correspond to
an actual BView within the scroll bar's window.

*/
}

void BScrollBar::SetRange(float min, float max)
{
	fMin=min;
	fMax=max;

	if(fValue>fMax)
		fValue=fMax;
	else
	if(fValue<fMin)
		fValue=fMin;

	Draw(Bounds());

	// Just a sort-of hack for now. ValueChanged is called, but with
	// what value??
	ValueChanged(fValue);
}

void BScrollBar::GetRange(float *min, float *max) const
{
	*min=fMin;
	*max=fMax;
}

void BScrollBar::SetSteps(float smallStep, float largeStep)
{
	// Under R5, steps can be set only after being attached to a window, probably because
	// the data is kept server-side. We'll just remove that limitation... :P

	// The BeBook also says that we need to specify an integer value even though the step
	// values are floats. For the moment, we'll just make sure that they are integers
	fSmallStep=(int32)smallStep;
	fLargeStep=(int32)largeStep;

	// TODO: test use of fractional values and make them work properly if they don't
}

void BScrollBar::GetSteps(float *smallStep, float *largeStep) const
{
	*smallStep=fSmallStep;
	*largeStep=fLargeStep;
}

void BScrollBar::SetTarget(BView *target)
{
	fTarget=target;
	if(fTargetName)
		delete fTargetName;
	if(fTarget)
	{
		fTargetName=new char[strlen(target->Name())+1];
		strcpy(fTargetName,target->Name());

		// TODO: theoretically, we should also set the target BView's scrollbar
		// pointer here
	}
	else
		fTargetName=NULL;
}

void BScrollBar::SetTarget(const char *targetName)
{
	if(!targetName)
		return;

	if(!Window())
		debugger("Method requires window and doesn't have one");

	BView *tgt=Window()->FindView(targetName);
	if(tgt)
		SetTarget(tgt);
}

BView *BScrollBar::Target() const
{
	return fTarget;
}

orientation BScrollBar::Orientation() const
{
	return fOrientation;
}

void BScrollBar::MessageReceived(BMessage *msg)
{
	switch(msg->what)
	{
		case B_VALUE_CHANGED:
		{
			int32 value;
			if(msg->FindInt32("value",&value)==B_OK)
				ValueChanged(value);
			break;
		}
		default:
			BView::MessageReceived(msg);
			break;
	}
}

void BScrollBar::MouseDown(BPoint pt)
{
	if(!(fMin==0 && fMax==0))	// if enabled
	{
		// Hit test for thumb
		if(privatedata->thumbframe.Contains(pt))
		{
			privatedata->tracking=true;
			privatedata->mousept=pt;
			SetMouseEventMask(0,B_LOCK_WINDOW_FOCUS);
			Draw(privatedata->thumbframe);
			return;
		}

		BRect buttonrect(0,0,B_V_SCROLL_BAR_WIDTH,B_H_SCROLL_BAR_HEIGHT);
		float scrollval=0;
		status_t returnval=B_ERROR;


		// Hit test for arrow buttons
		if(fOrientation==B_VERTICAL)
		{
			if(buttonrect.Contains(pt))
			{
				scrollval= -fSmallStep;
				privatedata->arrowdown=ARROW_UP;
				privatedata->buttondown=ARROW1;
				returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

				if(returnval==B_OK)
				{
					Draw(buttonrect);
					ValueChanged(fValue);

					if(privatedata->repeaterid==-1)
					{
						privatedata->exit_repeater=false;
						privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
							"scroll repeater",B_NORMAL_PRIORITY,this);
						resume_thread(privatedata->repeaterid);
					}
				}
				return;

			}

			buttonrect.OffsetTo(0,Bounds().Height() - (B_H_SCROLL_BAR_HEIGHT));
			if(buttonrect.Contains(pt))
			{
				scrollval= fSmallStep;
				privatedata->arrowdown=ARROW_DOWN;
				privatedata->buttondown=ARROW4;
				returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

				if(returnval==B_OK)
				{
					Draw(buttonrect);
					ValueChanged(fValue);

					if(privatedata->repeaterid==-1)
					{
						privatedata->exit_repeater=false;
						privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
							"scroll repeater",B_NORMAL_PRIORITY,this);
						resume_thread(privatedata->repeaterid);
					}
				}
				return;
			}

			if(privatedata->sbinfo.double_arrows)
			{
				buttonrect.OffsetTo(0,B_H_SCROLL_BAR_HEIGHT+1);
				if(buttonrect.Contains(pt))
				{
					scrollval= fSmallStep;
					privatedata->arrowdown=ARROW_DOWN;
					privatedata->buttondown=ARROW2;
					returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

					if(returnval==B_OK)
					{
						Draw(buttonrect);
						ValueChanged(fValue);

						if(privatedata->repeaterid==-1)
						{
							privatedata->exit_repeater=false;
							privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
								"scroll repeater",B_NORMAL_PRIORITY,this);
							resume_thread(privatedata->repeaterid);
						}
					}
					return;
				}

				buttonrect.OffsetTo(0,Bounds().Height()-( (B_H_SCROLL_BAR_HEIGHT*2)+1 ));
				if(buttonrect.Contains(pt))
				{
					scrollval= -fSmallStep;
					privatedata->arrowdown=ARROW_UP;
					privatedata->buttondown=ARROW3;
					returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

					if(returnval==B_OK)
					{
						Draw(buttonrect);
						ValueChanged(fValue);

						if(privatedata->repeaterid==-1)
						{
							privatedata->exit_repeater=false;
							privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
								"scroll repeater",B_NORMAL_PRIORITY,this);
							resume_thread(privatedata->repeaterid);
						}
					}
					return;

				}
			}

			// TODO: add a repeater thread for large stepping and a call to it

			if(pt.y<privatedata->thumbframe.top)
			{
				scrollval=-fLargeStep;
				control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);
			}
			else
			{
				scrollval=fLargeStep;
				control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);
			}
		}
		else
		{
			if(buttonrect.Contains(pt))
			{
				scrollval= -fSmallStep;
				privatedata->arrowdown=ARROW_LEFT;
				privatedata->buttondown=ARROW1;
				returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

				if(returnval==B_OK)
				{
					Draw(buttonrect);
					ValueChanged(fValue);

					if(privatedata->repeaterid==-1)
					{
						privatedata->exit_repeater=false;
						privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
							"scroll repeater",B_NORMAL_PRIORITY,this);
						resume_thread(privatedata->repeaterid);
					}
				}
				return;
			}

			buttonrect.OffsetTo(Bounds().Width() - (B_V_SCROLL_BAR_WIDTH),0);
			if(buttonrect.Contains(pt))
			{
				scrollval= fSmallStep;
				privatedata->arrowdown=ARROW_RIGHT;
				privatedata->buttondown=ARROW4;
				returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

				if(returnval==B_OK)
				{
					Draw(buttonrect);
					ValueChanged(fValue);

					if(privatedata->repeaterid==-1)
					{
						privatedata->exit_repeater=false;
						privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
							"scroll repeater",B_NORMAL_PRIORITY,this);
						resume_thread(privatedata->repeaterid);
					}
				}
				return;
			}

			if(privatedata->sbinfo.proportional)
			{
				buttonrect.OffsetTo(B_V_SCROLL_BAR_WIDTH+1,0);
				if(buttonrect.Contains(pt))
				{
					scrollval= fSmallStep;
					privatedata->buttondown=ARROW2;
					privatedata->arrowdown=ARROW_LEFT;
					returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

					if(returnval==B_OK)
					{
						Draw(buttonrect);
						ValueChanged(fValue);

						if(privatedata->repeaterid==-1)
						{
							privatedata->exit_repeater=false;
							privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
								"scroll repeater",B_NORMAL_PRIORITY,this);
							resume_thread(privatedata->repeaterid);
						}
					}
					return;
				}

				buttonrect.OffsetTo(Bounds().Width()-( (B_V_SCROLL_BAR_WIDTH*2)+1 ),0);
				if(buttonrect.Contains(pt))
				{
					scrollval= -fSmallStep;
					privatedata->buttondown=ARROW3;
					privatedata->arrowdown=ARROW_RIGHT;
					returnval=control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);

					if(returnval==B_OK)
					{
						Draw(buttonrect);
						ValueChanged(fValue);

						if(privatedata->repeaterid==-1)
						{
							privatedata->exit_repeater=false;
							privatedata->repeaterid=spawn_thread(privatedata->ButtonRepeaterThread,
								"scroll repeater",B_NORMAL_PRIORITY,this);
							resume_thread(privatedata->repeaterid);
						}
					}
					return;
				}
			}

			// We got this far, so apparently the user has clicked on something
			// that isn't the thumb or a scroll button, so scroll by a large step

			// TODO: add a repeater thread for large stepping and a call to it


			if(pt.x<privatedata->thumbframe.left)
			{
				scrollval=-fLargeStep;
				control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);
			}
			else
			{
				scrollval=fLargeStep;
				control_scrollbar(SBC_SCROLLBYVALUE,&scrollval,this);
			}
		}
		ValueChanged(fValue);
		Draw(Bounds());
	}
}

void BScrollBar::MouseUp(BPoint pt)
{
	privatedata->arrowdown=ARROW_NONE;\
	privatedata->buttondown=NOARROW;
	privatedata->exit_repeater=true;

	// We'll be lazy here and just draw all the possible arrow regions for now...
	// TODO: optimize

	BRect r(0,0,B_V_SCROLL_BAR_WIDTH,B_H_SCROLL_BAR_HEIGHT);

	if(fOrientation==B_VERTICAL)
	{
		r.bottom+=B_H_SCROLL_BAR_HEIGHT+1;
		Draw(r);
		r.OffsetTo(0,Bounds().Height()-((B_H_SCROLL_BAR_HEIGHT*2)+1) );
		Draw(r);
	}
	else
	{
		r.bottom+=B_V_SCROLL_BAR_WIDTH+1;
		Draw(r);
		r.OffsetTo(0,Bounds().Height()-((B_V_SCROLL_BAR_WIDTH*2)+1) );
		Draw(r);
	}

	if(privatedata->tracking)
	{
		privatedata->tracking=false;
		SetMouseEventMask(0,0);
		Draw(privatedata->thumbframe);
	}
}

void BScrollBar::MouseMoved(BPoint pt, uint32 transit, const BMessage *msg)
{
	if(!privatedata->enabled)
		return;

	if(transit==B_EXITED_VIEW || transit==B_OUTSIDE_VIEW)
		MouseUp(privatedata->mousept);

	if(privatedata->tracking)
	{
		float delta;
		if(fOrientation==B_VERTICAL)
		{
			if( (pt.y>privatedata->thumbframe.bottom && fValue==fMax) ||
				(pt.y<privatedata->thumbframe.top && fValue==fMin) )
				return;
			delta=pt.y-privatedata->mousept.y;
		}
		else
		{
			if( (pt.x>privatedata->thumbframe.right && fValue==fMax) ||
				(pt.x<privatedata->thumbframe.left && fValue==fMin) )
				return;
			delta=pt.x-privatedata->mousept.x;
		}
		control_scrollbar(SBC_SCROLLBYVALUE, &delta, this);
		ValueChanged(fValue);
		Draw(Bounds());
		privatedata->mousept=pt;
	}
}

void BScrollBar::DoScroll(float delta)
{
	if(!fTarget)
		return;

	float scrollval;

	if(delta>0)
		scrollval=(fValue+delta<=fMax)?delta:(fMax-fValue);
	else
		scrollval=(fValue-delta>=fMin)?delta:(fValue-fMin);

	if(fOrientation==B_VERTICAL)
	{
		fTarget->ScrollBy(0,scrollval);
		privatedata->thumbframe.OffsetBy(0,scrollval);
	}
	else
	{
		fTarget->ScrollBy(scrollval,0);
		privatedata->thumbframe.OffsetBy(scrollval,0);
	}
	fValue+=scrollval;
}

void BScrollBar::DetachedFromWindow()
{
	fTarget=NULL;
	delete fTargetName;
	fTargetName=NULL;
}

void BScrollBar::Draw(BRect updateRect)
{
	rgb_color light, dark,normal,c;
	c=ui_color(B_PANEL_BACKGROUND_COLOR);
	if(privatedata->enabled)
	{
		light=tint_color(c,B_LIGHTEN_MAX_TINT);
		dark=tint_color(c,B_DARKEN_3_TINT);
		normal=c;
	}
	else
	{
		light=tint_color(c,B_LIGHTEN_MAX_TINT);
		dark=tint_color(c,B_DARKEN_3_TINT);
		normal=c;
	}

	// Draw main area
	SetHighColor(normal);
	FillRect(updateRect);

	SetHighColor(dark);
	StrokeRect(Bounds());

	// Draw arrows
	BPoint buttonpt(0,0);
	if(fOrientation==B_HORIZONTAL)
	{
		privatedata->DrawScrollBarButton(this, ARROW_LEFT, buttonpt,
			privatedata->buttondown==ARROW1);

		if(privatedata->sbinfo.double_arrows)
		{
			buttonpt.Set(B_V_SCROLL_BAR_WIDTH+1,0);
			privatedata->DrawScrollBarButton(this, ARROW_RIGHT, buttonpt,
				privatedata->buttondown==ARROW2);

			buttonpt.Set(Bounds().Width()-( (B_V_SCROLL_BAR_WIDTH*2)+1 ),0);
			privatedata->DrawScrollBarButton(this, ARROW_LEFT, buttonpt,
				privatedata->buttondown==ARROW3);

		}

		buttonpt.Set(Bounds().Width()-(B_V_SCROLL_BAR_WIDTH),0);
		privatedata->DrawScrollBarButton(this, ARROW_RIGHT, buttonpt,
			privatedata->buttondown==ARROW4);
	}
	else
	{
		privatedata->DrawScrollBarButton(this, ARROW_UP, buttonpt,
			privatedata->buttondown==ARROW1);

		if(privatedata->sbinfo.double_arrows)
		{
			buttonpt.Set(0,B_H_SCROLL_BAR_HEIGHT+1);
			privatedata->DrawScrollBarButton(this, ARROW_DOWN, buttonpt,
				privatedata->buttondown==ARROW2);

			buttonpt.Set(0,Bounds().Height()-( (B_H_SCROLL_BAR_HEIGHT*2)+1 ));
			privatedata->DrawScrollBarButton(this, ARROW_UP, buttonpt,
				privatedata->buttondown==ARROW3);

		}

		buttonpt.Set(0,Bounds().Height()-(B_H_SCROLL_BAR_HEIGHT));
		privatedata->DrawScrollBarButton(this, ARROW_DOWN, buttonpt,
			privatedata->buttondown==ARROW4);
	}

	// Draw scroll thumb

	if(privatedata->enabled)
	{
		BRect r(privatedata->thumbframe);

		SetHighColor(dark);
		StrokeRect(privatedata->thumbframe);

		r.InsetBy(1,1);
		SetHighColor(tint_color(c,B_DARKEN_2_TINT));
		StrokeLine(r.LeftBottom(),r.RightBottom());
		StrokeLine(r.RightTop(),r.RightBottom());

		SetHighColor(light);
		StrokeLine(r.LeftTop(),r.RightTop());
		StrokeLine(r.LeftTop(),r.LeftBottom());

		r.InsetBy(1,1);
		if(privatedata->tracking)
			SetHighColor(tint_color(normal,B_DARKEN_1_TINT));
		else
			SetHighColor(normal);
		FillRect(r);
	}

	// TODO: Add the other thumb styles - dots and lines
}

void BScrollBar::FrameMoved(BPoint new_position)
{
}

void BScrollBar::FrameResized(float new_width, float new_height)
{
}

BHandler *BScrollBar::ResolveSpecifier(BMessage *msg,int32 index,
		BMessage *specifier,int32 form,const char *property)
{
	return NULL;
}

void BScrollBar::ResizeToPreferred()
{
}

void BScrollBar::GetPreferredSize(float *width, float *height)
{
	if (fOrientation == B_VERTICAL)
		*width = B_V_SCROLL_BAR_WIDTH;
	else if (fOrientation == B_HORIZONTAL)
		*height = B_H_SCROLL_BAR_HEIGHT;
}

void BScrollBar::MakeFocus(bool state)
{
	if(fTarget)
		fTarget->MakeFocus(state);
}

void BScrollBar::AllAttached()
{
}

void BScrollBar::AllDetached()
{
}

status_t BScrollBar::GetSupportedSuites(BMessage *data)
{
	return B_ERROR;
}

status_t BScrollBar::Perform(perform_code d, void *arg)
{
	return B_OK;
}

void BScrollBar::_ReservedScrollBar1()
{
}

void BScrollBar::_ReservedScrollBar2()
{
}

void BScrollBar::_ReservedScrollBar3()
{
}

void BScrollBar::_ReservedScrollBar4()
{
}

BScrollBar &BScrollBar::operator=(const BScrollBar &)
{
	return *this;
}

/*
	This cheat function will allow the scrollbar prefs app to act exactly like R5's and
	perform other stuff without mucking around with the virtual tables B_BAD_VALUE is
	returned when a NULL scrollbar pointer is passed to it

	Command list:

	0:	Scroll By Value:	increment or decrement scrollbar's value by a certain amount.
				data parameter is cast to a float * and used to modify the value.
				Returns B_OK if everthing went well and the caller is to redraw the scrollbar
				B_ERROR is returned if the caller doesn't need to do anything
				B_BAD_VALUE is returned if data is NULL
	1: Set Double:			set usage mode to either single or double.
				data parameter is cast to a bool. true sets it to double, false sets to single
				B_OK is always returned
				B_BAD_VALUE is returned if data is NULL
	2: Set Proportional:	set usage mode to either proportional or fixed thumbsize.
				data parameter is cast to a bool. true sets it to proportional, false sets to fixed
				B_OK is always returned
				B_BAD_VALUE is returned if data is NULL
	3: Set Style:			set thumb style to blank, 3 dots, or 3 lines
				data parameter is cast to an int8. 0 is blank, 1 is dotted, 2 is lined
				B_ERROR is returned for values != 0, 1, or 2
				B_BAD_VALUE is returned if data is NULL
*/
status_t control_scrollbar(int8 command, void *data, BScrollBar *sb)
{
	if(!sb)
		return B_BAD_VALUE;

	switch(command)
	{
		case 0: 	// Scroll By Value
		{
			if(!data)
				return B_BAD_VALUE;

			float datavalue=*((float *)data);
			if(datavalue==0)
				return B_ERROR;

			if(sb->fOrientation==B_VERTICAL)
			{
				if(datavalue<0)
				{
					if(sb->fValue + datavalue >= sb->fMin)
					{
						sb->fValue += datavalue;
						if(sb->fTarget)
							sb->fTarget->ScrollBy(0,datavalue);
						sb->privatedata->thumbframe.OffsetBy(0,datavalue);
						sb->fValue--;
						return B_OK;
					}
					// fall through to return B_ERROR
				}
				else
				{
					if(sb->fValue + datavalue <= sb->fMax)
					{
						sb->fValue += datavalue;
						if(sb->fTarget)
							sb->fTarget->ScrollBy(0,datavalue);
						sb->privatedata->thumbframe.OffsetBy(0,datavalue);
						sb->fValue++;
						return B_OK;
					}
					// fall through to return B_ERROR
				}
			}
			else
			{
				if(datavalue<0)
				{
					if(sb->fValue + datavalue >= sb->fMin)
					{
						sb->fValue += datavalue;
						if(sb->fTarget)
							sb->fTarget->ScrollBy(datavalue,0);
						sb->privatedata->thumbframe.OffsetBy(datavalue,0);
						sb->fValue--;
						return B_OK;
					}
					// fall through to return B_ERROR
				}
				else
				{
					if(sb->fValue + datavalue <= sb->fMax)
					{
						sb->fValue += datavalue;
						if(sb->fTarget)
							sb->fTarget->ScrollBy(datavalue,0);
						sb->privatedata->thumbframe.OffsetBy(datavalue,0);
						sb->fValue++;
						return B_OK;
					}
					// fall through to return B_ERROR
				}
			}
			return B_ERROR;
		}// end case 0 (Scroll By Value)

		case 1:		// Set Double
		{
			if(!data)
				return B_BAD_VALUE;

			bool datavalue=*((bool *)data);

			if(sb->privatedata->sbinfo.double_arrows==datavalue)
				return B_OK;

			sb->privatedata->sbinfo.double_arrows=datavalue;

			int8 multiplier=(datavalue)?1:-1;

			if(sb->fOrientation==B_VERTICAL)
				sb->privatedata->thumbframe.OffsetBy(0,multiplier*B_H_SCROLL_BAR_HEIGHT);
			else
				sb->privatedata->thumbframe.OffsetBy(multiplier*B_V_SCROLL_BAR_WIDTH,0);
			return B_OK;
		}

		case 2:		// Set Proportional
		{
			// TODO: Figure out how proportional relates to the size of the thumb

			if(!data)
				return B_BAD_VALUE;

			bool datavalue=*((bool *)data);
			sb->privatedata->sbinfo.proportional=datavalue;
			return B_OK;
		}

		case 3:		// Set Style
		{
			// TODO: Add redraw code to reflect the changes

			if(!data)
				return B_BAD_VALUE;

			int8 datavalue=*((int8 *)data);

			if(datavalue!=0 && datavalue!=1 && datavalue!=2)
				return B_BAD_VALUE;

			sb->privatedata->sbinfo.knob=datavalue;
			return B_OK;
		}

		default:
		{
			printf("Unknown command value %d in control_scrollbar\n",command);
			break;
		}
	} // end command switch


	// We should never get here unless I've done something dumb in calling the function
	return B_BAD_VALUE;
}

void BScrollBarPrivateData::DrawScrollBarButton(BScrollBar *owner, arrow_direction direction,
	const BPoint &offset, bool down)
{
	// Another hack for code size

	BRect r(offset.x,offset.y,offset.x+14,offset.y+14);

	rgb_color c=ui_color(B_PANEL_BACKGROUND_COLOR);
	rgb_color light, dark, normal,arrow,arrow2;

	if(down)
	{
		light=tint_color(c,B_DARKEN_3_TINT);
		arrow2=dark=tint_color(c,B_LIGHTEN_MAX_TINT);
		normal=c;
		arrow=tint_color(c,B_DARKEN_MAX_TINT);
	}
	else
	{
		bool use_enabled_colors=enabled;

		// Add a usability perk - disable buttons if they would not do anything -
		// like a left arrow if the value==fMin
		if( (direction==ARROW_LEFT || direction==ARROW_UP) &&
					(owner->fValue==owner->fMin) )
			use_enabled_colors=false;
		else
		if( (direction==ARROW_RIGHT || direction==ARROW_DOWN) &&
					(owner->fValue==owner->fMax) )
			use_enabled_colors=false;


		if(use_enabled_colors)
		{
			arrow2=light=tint_color(c,B_LIGHTEN_MAX_TINT);
			dark=tint_color(c,B_DARKEN_3_TINT);
			normal=c;
			arrow=tint_color(c,B_DARKEN_MAX_TINT);
		}
		else
		{
			arrow2=light=tint_color(c,B_LIGHTEN_1_TINT);
			dark=tint_color(c,B_DARKEN_1_TINT);
			normal=c;
			arrow=tint_color(c,B_DARKEN_1_TINT);
		}
	}

	BPoint tri1,tri2,tri3;

	switch(direction)
	{
		case ARROW_LEFT:
		{
			tri1.Set(r.left+3,(r.top+r.bottom)/2);
			tri2.Set(r.right-3,r.top+3);
			tri3.Set(r.right-3,r.bottom-3);
			break;
		}
		case ARROW_RIGHT:
		{
			tri1.Set(r.left+3,r.bottom-3);
			tri2.Set(r.left+3,r.top+3);
			tri3.Set(r.right-3,(r.top+r.bottom)/2);
			break;
		}
		case ARROW_UP:
		{
			tri1.Set(r.left+3,r.bottom-3);
			tri2.Set((r.left+r.right)/2,r.top+3);
			tri3.Set(r.right-3,r.bottom-3);
			break;
		}
		default:
		{
			tri1.Set(r.left+3,r.top+3);
			tri2.Set(r.right-3,r.top+3);
			tri3.Set((r.left+r.right)/2,r.bottom-3);
			break;
		}
	}

	r.InsetBy(1,1);
	owner->SetHighColor(normal);
	owner->FillRect(r);

	owner->SetHighColor(arrow);
	owner->FillTriangle(tri1,tri2,tri3);

	r.InsetBy(-1,-1);
	owner->SetHighColor(dark);
	owner->StrokeLine(r.LeftBottom(),r.RightBottom());
	owner->StrokeLine(r.RightTop(),r.RightBottom());
	owner->StrokeLine(tri2,tri3);
	owner->StrokeLine(tri1,tri3);

	owner->SetHighColor(light);
	owner->StrokeLine(r.LeftTop(),r.RightTop());
	owner->StrokeLine(r.LeftTop(),r.LeftBottom());

	owner->SetHighColor(arrow2);
	owner->StrokeLine(tri1,tri2);
}