BOOL ContextMenu::ShowOverView(Spread* pSpread, DocCoord ClickPos, ClickModifiers ClickMods)
{
// If there's a menu still around for some reason, get rid of it.
if (pCurrentMenu)
{
pCurrentMenu->Hide();
}
// Preserve current ID generator state
AutoIDStash = MenuItem::GetAutomaticIDState();
// Make a new root item
pRootItem = new MenuItem("CONTEXT");
if (pRootItem)
{
// OK, make this menu current and try to build it's contents
pCurrentMenu=this;
if (BuildOverView(pSpread, ClickPos, ClickMods))
{
// Kernel menu built OK so create the OILy part of it...
CreateContextMenu(pRootItem);
return TRUE;
}
}
// Failed to completely build Kernel menu structure so delete anything
// that might have been built...
Hide();
return FALSE;
}
bool MyMainWindow::CheckOverView(GDALDataset*pDataset)
{
GDALRasterBand *pband=pDataset->GetRasterBand(1);
int n=pband->GetOverviewCount();
if (n==0)
{
BuildOverView(pDataset);
QMessageBox w;
w.setText("build over view for the image,please reopen it!");
return false;
}
return true;
}
