PScrollBar.cxx

//==============================================================================
// File:        PScrollBar.cxx
//
// Copyright (c) 2017, Phil Harvey, Queen's University
//==============================================================================
#include <Xm/ScrollBar.h>
#include "PScrollBar.h"
#include "PScrollingWindow.h"

const int   kScrollIncrement    = 100;

// scrollBar callback
static void scrollBarProc(Widget w, PScrollBar *aScroll, XmScrollBarCallbackStruct *call_data)
{
    if (aScroll->GetHandler()) {
        aScroll->GetHandler()->ScrollValueChanged(aScroll->GetType(), call_data->value);
    }
}

// ------------------------------------------------------------------------------------------------------------
// PScrollBar constructor
//
PScrollBar::PScrollBar(Widget container, EScrollBar bar, char *name, Arg *aWargs, int an, PScrollHandler *handler)
{
    int     n;
    Arg     wargs[10];
    
    mType = bar;
    mHandler = handler;
    mScrollWidget = XtCreateManagedWidget(name, xmScrollBarWidgetClass, container, aWargs, an);
    
    // override scrollbar range to set all scrollbars to 0 -> kScrollMax
    n = 0;
    XtSetArg(wargs[n], XmNminimum, 0); ++n;
    XtSetArg(wargs[n], XmNmaximum, kScrollMax + kSliderSize); ++n;
    XtSetArg(wargs[n], XmNsliderSize, kSliderSize); ++n;
    XtSetArg(wargs[n], XmNpageIncrement, kSliderSize); ++n;
    XtSetArg(wargs[n], XmNincrement, kScrollIncrement); ++n;
    XtSetValues(mScrollWidget, wargs, n);

    XtAddCallback(mScrollWidget, XmNvalueChangedCallback, (XtCallbackProc)scrollBarProc, this);
    XtAddCallback(mScrollWidget, XmNdragCallback, (XtCallbackProc)scrollBarProc, this);
}

PScrollBar::~PScrollBar()
{
}