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Workaround for glXChooseVisual() bug on some systems where a doublebuffer
visual is returned even when not requested. This occasionally prevented sliders
from being displayed (identified by Dennis Mikkelson).

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 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
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*
 * Copyright (C) 1990-93   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.2 $
 |
 |   Classes:
 |	_SoXtSlider
 |
 |   Author(s)	: Alain Dumesny
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
#include <inttypes.h>
#include <Inventor/Xt/SoXt.h>
#include <Inventor/Xt/devices/SoXtMouse.h>
#include <Inventor/errors/SoDebugError.h>
#include "SoFloatCallbackList.h"
#include "_SoXtUIRegion.h"
#include "_SoXtSlider.h"

#include <stream.h>
#include <malloc.h>
#include <string.h>

#include <X11/StringDefs.h>
#include <X11/Intrinsic.h>
#include <Xm/Form.h>
#include <Xm/Text.h>
#include <Xm/Label.h>
#include <Xm/LabelG.h>

#include <GL/gl.h>

#ifdef _POSIX_SOURCE
extern "C" char *strdup(const char *);
#endif


/*
 * Defines
 */

#define BOX_H	    12	    // thum height
#define BOX_L	    7	    // thum width/2
#define SPACE	    2
#define THUMB_SPACE 1
#define SIDE	    (UI_THICK + SPACE + UI_THICK)

// pixels between the slider and the label
#define TEXT_OFFSET 6

////////////////////////////////////////////////////////////////////////
//
// Public constructor - build the widget right now
//
_SoXtSlider::_SoXtSlider(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent)
	: SoXtGLWidget(
	    parent,
	    name, 
	    buildInsideParent, 
	    SO_GLX_RGB, 
	    FALSE) // tell GLWidget not to build just yet  
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component is what the app wants, so buildNow = TRUE
    constructorCommon(TRUE);
}

////////////////////////////////////////////////////////////////////////
//
// SoEXTENDER constructor - the subclass tells us whether to build or not
//
_SoXtSlider::_SoXtSlider(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent, 
    SbBool buildNow)
	: SoXtGLWidget(
	    parent,
	    name, 
	    buildInsideParent, 
	    SO_GLX_RGB, 
	    FALSE) // tell GLWidget not to build just yet  
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component may be what the app wants, 
    // or it may want a subclass of this component. Pass along buildNow
    // as it was passed to us.
    constructorCommon(buildNow);
}

////////////////////////////////////////////////////////////////////////
//
// Called by the constructors
//
// private
//
void
_SoXtSlider::constructorCommon(SbBool buildNow)
//
//////////////////////////////////////////////////////////////////////
{
    mouse = new SoXtMouse(ButtonPressMask | ButtonMotionMask | ButtonReleaseMask);

    // init local vars
    startCallbacks  	= new SoFloatCallbackList;
    changedCallbacks 	= new SoFloatCallbackList;
    finishCallbacks 	= new SoFloatCallbackList;
    interactive = FALSE;
    value = 0.0;
    sliderWidget = labelWidget = numberWidget = mgrWidget = NULL;
    labelStr = NULL;
    numberVisible = TRUE; // show the number by default
    
    // slider geometry vars which do not depend on window size
    slx1 = sly1 = SIDE;
    thumy1 = THUMB_SPACE;
    thumy2 = thumy1 + BOX_H;
    
    sliderSize.setValue(110, 25);  // default slider size
    
    // Build the widget tree, and let SoXtComponent know about our base widget.
    if (buildNow) {
	Widget w = buildWidget(getParentWidget());
	setBaseWidget(w);
    }
}

////////////////////////////////////////////////////////////////////////
//
//    Destructor.
//

_SoXtSlider::~_SoXtSlider()
//
////////////////////////////////////////////////////////////////////////
{
    delete startCallbacks;
    delete changedCallbacks;
    delete finishCallbacks;
    if (labelStr != NULL) free(labelStr);
    delete mouse;
}


////////////////////////////////////////////////////////////////////////
//
//	This routine draws the entire slider region.
//
// Use: virtual public

void
_SoXtSlider::redraw()
//
////////////////////////////////////////////////////////////////////////
{
    if (! isVisible())
	return;
    glXMakeCurrent(getDisplay(), getNormalWindow(), getNormalContext());
    
    // compute thum position
    position = slx1 + short(value * (slx2 - slx1));
    thumx1 = position - BOX_L;
    thumx2 = position + BOX_L;
    
    // draw slider surrounding
    SbVec2s size = getGlxSize();
    SoDrawDownUIRegion(0, 0, size[0]-1, size[1]-1);
    
    // now call the routine which does drawing inside the slider top region
    drawSliderTopRegion();
}


////////////////////////////////////////////////////////////////////////
//
//  Sets the label string.
//
// Use: public

void
_SoXtSlider::setLabel(const char *newlabel)
//
////////////////////////////////////////////////////////////////////////
{
    // out with the old...
    if (labelStr != NULL) free(labelStr);
    labelStr = NULL;
    
    // in with the new...
    if (newlabel != NULL)
    	labelStr = strdup(newlabel);
    
    if (getWidget() != NULL)
    	doLabelLayout();
}

////////////////////////////////////////////////////////////////////////
//
//  Sets visibility of the numeric field
//
// Use: public

void
_SoXtSlider::setNumericFieldVisible(SbBool setVisible)
//
////////////////////////////////////////////////////////////////////////
{
    if (setVisible) {
	if (numberVisible)
	    return;	// already visible
	else {
	    // make the number visible
	    numberVisible = TRUE;
	    if (getWidget() != NULL)
		doNumberLayout();
	}
    }
    else {
	if (! numberVisible)
	    return;	// already not visible
	else {
	    // make the number not visible
	    numberVisible = FALSE;
	    if (getWidget() != NULL)
		doNumberLayout();
	}
    }
}


////////////////////////////////////////////////////////////////////////
//
//  lays out the motif label (if any) and slider relative to it.
//
// Use: private

void
_SoXtSlider::doLabelLayout()
//
////////////////////////////////////////////////////////////////////////
{
    int n;
    Arg args[10];
    
    if (labelStr == NULL) {
    	
    	XtSetArg(args[0], XmNleftAttachment, 	    XmATTACH_FORM);
    	XtSetValues(sliderWidget, args, 1);
	    
	if (labelWidget != 0) {
	    //??? XtUnmanage first?
	    XtDestroyWidget(labelWidget);
	    labelWidget = 0;
	}
    }
    else {
	if (labelWidget == 0) {
	    
	    labelWidget = XtCreateWidget(labelStr, xmLabelGadgetClass, mgrWidget, 
            	NULL, 0);
	    
	    n = 0;
	    XtSetArg(args[n], XmNtopAttachment,     XmATTACH_FORM); n++;
	    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_FORM); n++;
	    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_FORM); n++;
	    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_NONE); n++;
	    XtSetValues(labelWidget, args, n);
	    
	    n = 0;
	    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_WIDGET); n++;
	    XtSetArg(args[n], XmNleftWidget, 	    labelWidget); n++;
	    XtSetArg(args[n], XmNleftOffset, 	    TEXT_OFFSET); n++;
	    XtSetValues(sliderWidget, args, n);
	    
	    XtManageChild(labelWidget);
	}
	else {
	    XtSetArg(args[0], XmNname, labelStr);
	    XtSetValues(labelWidget, args, 1);
	}
    }
}

////////////////////////////////////////////////////////////////////////
//
//  lays out the motif numeric text field (if any) and slider relative to it.
//
// Use: private

void
_SoXtSlider::doNumberLayout()
//
////////////////////////////////////////////////////////////////////////
{
    int n;
    Arg args[10];
    
    if (! numberVisible) {
    	
    	XtSetArg(args[0], XmNrightAttachment, 	    XmATTACH_FORM);
    	XtSetValues(sliderWidget, args, 1);
	    
	if (numberWidget != NULL) {
	    //??? XtUnmanage first?
	    XtDestroyWidget(numberWidget);
	    numberWidget = NULL;
	}
    }
    else {
	if (numberWidget == NULL) {
	    
	    n = 0;
	    XtSetArg(args[n], XmNhighlightThickness, 1); n++;
	    XtSetArg(args[n], XmNcolumns, 4); n++;
	    numberWidget = XtCreateWidget("sliderText", xmTextWidgetClass,
		mgrWidget, args, n);
	    XtAddCallback(numberWidget, XmNactivateCallback, 
		(XtCallbackProc) _SoXtSlider::textFieldCB, (XtPointer) this);
	    
	    n = 0;
	    XtSetArg(args[n], XmNtopAttachment,	    XmATTACH_NONE); n++;
	    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_NONE); n++;
	    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_FORM); n++;
	    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_FORM); n++;
	    XtSetValues(numberWidget, args, n);
	    
	    n = 0;
	    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_WIDGET); n++;
	    XtSetArg(args[n], XmNrightWidget, 	    numberWidget); n++;
	    XtSetValues(sliderWidget, args, n);
	    
	    // now set the string to the slider value
	    char valStr[6];
	    sprintf(valStr, "%.2f", getValue());
	    XmTextSetString(numberWidget, valStr);
    
	    XtManageChild(numberWidget);
	}
#ifdef DEBUG
	else {
	    SoDebugError::post("_SoXtSlider::doNumberLayout::menuPick",
		"INTERNAL ERROR");
	}
#endif
    }
}



////////////////////////////////////////////////////////////////////////
//
// Description:
//  	This builds the parent Glx widget, then registers interest
// in mouse events.
//
// Use: virtual protected
Widget
_SoXtSlider::buildWidget(Widget parent)
//
////////////////////////////////////////////////////////////////////////
{
    int n;
    Arg args[10];
    
    //
    // create a top form to hold everything together
    //
    mgrWidget = XtCreateWidget(getWidgetName(), xmFormWidgetClass, parent, NULL, 0);
    // ??? do we need to register this widget class?
    
    //
    // create _SoXtSlider and text widget
    //
    sliderWidget = SoXtGLWidget::buildWidget(mgrWidget);
    SoXt::setWidgetSize(sliderWidget, sliderSize);
    mouse->enable(getNormalWidget(), 
		(XtEventHandler) SoXtGLWidget::eventHandler,
		(XtPointer) this);
    
    
    //
    // do layout
    //
    
    n = 0;
    XtSetArg(args[n], XmNtopAttachment,     	XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNbottomAttachment,  	XmATTACH_FORM); n++;
    XtSetValues(sliderWidget, args, n);
    
    doLabelLayout();
    doNumberLayout();
    
    // manage that slider
    XtManageChild(sliderWidget);
    
    return mgrWidget;

}

////////////////////////////////////////////////////////////////////////
//
//  Resize the slider (only) widget
//
// Use: virtual public
void
_SoXtSlider::setSliderSize(const SbVec2s &newSize)
//
////////////////////////////////////////////////////////////////////////
{
    if (sliderWidget != NULL)
	 SoXt::setWidgetSize(sliderWidget, newSize);
    sliderSize = newSize;
}

////////////////////////////////////////////////////////////////////////
//
//  Returns the slider (only) widget size
//
// Use: virtual public
SbVec2s
_SoXtSlider::getSliderSize()
//
////////////////////////////////////////////////////////////////////////
{
    return sliderSize;
}

////////////////////////////////////////////////////////////////////////
//
// Process the passed X event.
//
// Use: virtual public

void
_SoXtSlider::processEvent(XAnyEvent *xe)
//
////////////////////////////////////////////////////////////////////////
{
    short x, y;
    XButtonEvent *be;
    XMotionEvent *me;
    SbVec2s size = getGlxSize();
    
    switch (xe->type) {
	case ButtonPress:
	    be = (XButtonEvent *) xe;
	    if (be->button == Button1) {
		
		startCallbacks->invokeCallbacks(value);
		interactive = TRUE;
		
		// check for thumb picking region
		x = short(be->x);
		y = short(size[1] - be->y);
		if (x>thumx1 && x<thumx2 && 
		    y>thumy1 && y<thumy2)
		    posdiff = x - position;
		else {
		    posdiff = 0;
		    setValue((x - slx1 - posdiff) / float(slx2 - slx1));
		}
	    }
	    break;
	    
	case ButtonRelease:
	    be = (XButtonEvent *) xe;
	    if (be->button == Button1) {
		interactive = FALSE;
		finishCallbacks->invokeCallbacks(value);
	    }
	    break;
	    
	case MotionNotify:
	    me = (XMotionEvent *) xe;
	    if (me->state & Button1Mask)
		setValue((me->x - slx1 - posdiff) / float(slx2 - slx1));
	    break;
    }
}


////////////////////////////////////////////////////////////////////////
//
//  Sets the slider to this value..
//
// Use: public

void
_SoXtSlider::setValue(float v)
//
////////////////////////////////////////////////////////////////////////
{
    // assign the clipped value and check for redraw needs
    float old = value;
    value = (v > 1.0) ? 1.0 : ((v < 0.0) ? 0.0 : v) ;
    
    if (value == old)
    	return;
    
    redraw();
    
    // update text field
    if (numberWidget != NULL) {
	char valStr[6];
	sprintf(valStr, "%.2f", value);
	XmTextSetString(numberWidget, valStr);
    }
    
    changedCallbacks->invokeCallbacks(value);
}


////////////////////////////////////////////////////////////////////////
//
//  This routine is when the window has changed size
//
// Use: virtual protected

void
_SoXtSlider::sizeChanged(const SbVec2s &newSize)
//
////////////////////////////////////////////////////////////////////////
{
    // calculate slider parameters which depends on window size
    slx2 = newSize[0] - SIDE -1;
    sly2 = newSize[1] - SIDE -1;
    
    // reset projection
    glXMakeCurrent(getDisplay(), getNormalWindow(), getNormalContext());
    glViewport(0, 0, newSize[0], newSize[1]);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, newSize[0], 0, newSize[1], -1, 1);
}


////////////////////////////////////////////////////////////////////////
//
//  Draws the little white maker. subclasses can redefine this routine to
//  make the slider top region look like anything they want.
//
// Use: virtual protected

void
_SoXtSlider::drawSliderTopRegion()
//
////////////////////////////////////////////////////////////////////////
{
    MAIN_UI_COLOR;
    glRects(slx1, sly1, slx2, sly2);
    SoDrawThumbUIRegion(thumx1, thumy1, thumx2, thumy2);
    
    if (isDoubleBuffer())
	glXSwapBuffers(getDisplay(), getNormalWindow());
    else
	glFlush();
}

void
_SoXtSlider::addStartCallback(_SoXtSliderCB *f, void *userData)
{ startCallbacks->addCallback((SoFloatCallbackListCB *)f, userData); }
	
void
_SoXtSlider::addValueChangedCallback(_SoXtSliderCB *f, void *userData)
{ changedCallbacks->addCallback((SoFloatCallbackListCB *)f, userData); }

void
_SoXtSlider::addFinishCallback(_SoXtSliderCB *f, void *userData)
{ finishCallbacks->addCallback((SoFloatCallbackListCB *)f, userData); }

void
_SoXtSlider::removeStartCallback(_SoXtSliderCB *f, void *userData)
{ startCallbacks->removeCallback((SoFloatCallbackListCB *)f, userData); }
	
void
_SoXtSlider::removeValueChangedCallback(_SoXtSliderCB *f, void *userData)
{ changedCallbacks->removeCallback((SoFloatCallbackListCB *)f, userData); }

void
_SoXtSlider::removeFinishCallback(_SoXtSliderCB *f, void *userData)
{ finishCallbacks->removeCallback((SoFloatCallbackListCB *)f, userData); }




//
////////////////////////////////////////////////////////////////////////
// static callbacks stubs
////////////////////////////////////////////////////////////////////////
//




//
// called whenever the user types a new value in the text field.
//
void
_SoXtSlider::textFieldCB(Widget w, _SoXtSlider *p, XtPointer)
{
    // get text value from the label
    char *str = XmTextGetString(w);
    float val;
    if (sscanf(str, "%f", &val))
	p->setValue(val);
    else {
	// reformat the text field
	char valStr[6];
	sprintf(valStr, "%.2f", p->getValue());
	XmTextSetString(w, valStr);
    }
    free(str);
    
    // make the text field loose the focus
    XmProcessTraversal(SoXt::getShellWidget(w), XmTRAVERSE_CURRENT);
}