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#define Uses_ScrollGroup
// ===================================================================
#define Uses_TGroup
#define Uses_TPoint
#define Uses_TRect
// ===================================================================
#define Uses_TScrollBar
#define Uses_TBackground
#define Uses_TEvent
// ===================================================================
#include <tv.h>
#include "dlg.h"
// ===================================================================
ScrollGroup::ScrollGroup(const TRect& bounds, TScrollBar* hsb, TScrollBar* vsb) :
ScrollGroupInit(initBackground),
TGroup(bounds),
hScrollBar(hsb),
vScrollBar(vsb),
background(0)
{
eventMask |= evBroadcast;
delta.x = delta.y = limit.x = limit.y = 0;
if(bkgdMaker != 0 && (background = bkgdMaker(getExtent())) != 0)
{
background->growMode = gfGrowHiX | gfGrowHiY;
insert(background);
}
}
void ScrollGroup::changeBounds(const TRect& bounds)
{
lock();
TGroup::changeBounds(bounds);
setLimit(limit.x, limit.y);
unlock();
drawView();
}
static Boolean isView(TView* view, void* args)
{
return Boolean(view == args);
}
void ScrollGroup::handleEvent(TEvent& event)
{
TGroup::handleEvent(event);
if(event.what == evBroadcast)
{
if(event.message.command == cmScrollBarChanged &&
(event.message.infoPtr == hScrollBar ||
event.message.infoPtr == vScrollBar))
scrollDraw();
else if(event.message.command == cmReceivedFocus &&
firstThat(isView, event.message.infoPtr) != 0)
focusSubView((TView*) event.message.infoPtr);
}
}
struct ScrollInfo
{
TPoint delta;
TView* ignore;
};
static void doScroll(TView* view, void* args)
{
ScrollInfo* info = (ScrollInfo*) args;
if(view != info->ignore)
{
TPoint dest = view->origin + info->delta;
view->moveTo(dest.x, dest.y);
}
}
void ScrollGroup::scrollDraw()
{
TPoint d;
d.x = hScrollBar ? hScrollBar->value : 0;
d.y = vScrollBar ? vScrollBar->value : 0;
if( d.x != delta.x || d.y != delta.y )
{
ScrollInfo info;
info.delta = delta-d;
info.ignore = background;
lock();
forEach(doScroll, &info);
delta = d;
unlock();
drawView();
}
}
void ScrollGroup::scrollTo(int x, int y)
{
lock();
if( hScrollBar != 0 && x != hScrollBar->value)
hScrollBar->setValue(x);
if( vScrollBar != 0 && y != vScrollBar->value)
vScrollBar->setValue(y);
unlock();
scrollDraw();
}
void ScrollGroup::setLimit(int x, int y)
{
limit.x = x;
limit.y = y;
lock();
if(hScrollBar != 0)
hScrollBar->setParams(hScrollBar->value, 0, x-size.x, size.x-1, 1);
if(vScrollBar != 0 )
vScrollBar->setParams(vScrollBar->value, 0, y-size.y, size.y-1, 1);
unlock();
scrollDraw();
}
void ScrollGroup::setState(ushort aState, Boolean enable)
{
TGroup::setState(aState, enable);
if((aState & (sfActive | sfSelected)) != 0 )
{
if(hScrollBar != 0)
if(enable)
hScrollBar->show();
else
hScrollBar->hide();
if(vScrollBar != 0)
if(enable)
vScrollBar->show();
else
vScrollBar->hide();
}
}
void ScrollGroup::focusSubView(TView* view)
{
TRect rview = view->getBounds();
TRect r = getExtent();
r.intersect(rview);
if(r != rview)
{
int dx, dy;
dx = delta.x;
if(view->origin.x < 0)
dx = delta.x + view->origin.x;
else if(view->origin.x + view->size.x > size.x)
dx = delta.x+view->origin.x+view->size.x-size.x;
dy = delta.y;
if(view->origin.y < 0)
dy = delta.y + view->origin.y;
else if(view->origin.y + view->size.y > size.y)
dy = delta.y+view->origin.y+view->size.y-size.y;
scrollTo(dx, dy);
}
}
TBackground* ScrollGroup::initBackground(TRect r)
{
return new TBackground(r, ' ');
}
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