yang686526

layer updates
layer updates
hi,
my mfc app uses the doc/view structure, and i'm using vc2003 + dd2.2. the problem i have is possibly simple, but i can't see where to go. i load in a file into a database, and once loaded, i scan the layer table, setting some of the layers off (for application reasons) using setisoff(true). this sets them off correctly, so when the view is displayed they are not visible. however, when i try to then set them on, using setisoff(false), they are not updated on the view.
after a day of struggling with this, i've found that if i leave it till the layers have been drawn the first time before i set them off, then it works correctly, but if i set them off before the first view update, then i can never display them after that.
but if i interrogate the layer records, they are set as on/unlocked/not frozen, so i reckon they should be displayed.
in my cview:npaint routine if i have
void cplanview:npaint()
{
if (m_blayersneedswitchingoff)
{
m_pdoc->switchoffrequiredlayers();
m_blayersneedswitchingoff = false;
}
if(!m_pdevice.isnull()) m_pdevice->update();
invalidate();
cview:npaint();
}
it does not work, but it works if i have :
void cplanview:npaint()
{
if(!m_pdevice.isnull()) m_pdevice->update();
if (m_blayersneedswitchingoff)
{
m_pdoc->switchoffrequiredlayers();
m_blayersneedswitchingoff = false;
}
invalidate();
cview:npaint();
}
have i missed something?
thanks in advance,
ali smith