PScrollingWindow.cxx

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

PScrollingWindow::PScrollingWindow(ImageData *data)
                : PWindow(data)
{
    for (int i=0; i<kNumScrollBars; ++i) {
        mScrollBar[i] = NULL;
    }
}

PScrollingWindow::~PScrollingWindow()
{
    for (int i=0; i<kNumScrollBars; ++i) {
        delete mScrollBar[i];
    }
}


// --------------------------------------------------------------------------------
// New ScrollBar
//
// Create new scroll bar in window
//
void PScrollingWindow::NewScrollBar(EScrollBar bar, char *name, Arg *wargs, int n)
{
    delete mScrollBar[bar];
    
    mScrollBar[bar] = new PScrollBar(GetMainPane(),bar,name,wargs,n);
    mScrollBar[bar]->SetHandler(this);  // default to this as the scroll handler
}

void PScrollingWindow::SetScrollValue(EScrollBar bar, int value, int do_callback)
{
    Arg     wargs[1];
    
    if (!GetScrollBar(bar)) return;
    
    if (value < 0) value = 0;
    if (value > kScrollMax) value = kScrollMax;
    
    XtSetArg(wargs[0], XmNvalue, value);
    XtSetValues(GetScrollBar(bar)->GetWidget(),wargs,1);

    if (do_callback) {
        GetScrollBar(bar)->GetHandler()->ScrollValueChanged(bar,value);
    }
}


int PScrollingWindow::GetScrollValue(EScrollBar bar)
{
    Arg     wargs[1];
    int     value;
    
    if (!GetScrollBar(bar)) return(0);
    
    XtSetArg(wargs[0], XmNvalue, &value);
    XtGetValues(GetScrollBar(bar)->GetWidget(),wargs,1);
    
    return(value);
}

// SetScrollHandler - set handler for existing scrollbars
void PScrollingWindow::SetScrollHandler(PScrollHandler *hand)
{
    for (int i=0; i<kNumScrollBars; ++i) {
        if (mScrollBar[i]) {
            mScrollBar[i]->SetHandler(hand);
        }
    }
}