//------------------------------------------------------------------------------//
bool InventoryReceiver::itemWillFitAtLocation(const InventoryItem& item,
int x, int y)
{
if (x < 0 || y < 0)
return false;
if (x + item.contentWidth() > d_content.width() ||
y + item.contentHeight() > d_content.height())
return false;
const bool already_attached = this == item.getParent();
// if item is already attatched erase its data from the content map so the
// test result is reliable.
if (already_attached)
eraseItemFromContentMap(item);
bool result = true;
for (int item_y = 0; item_y < item.contentHeight() && result; ++item_y)
{
for (int item_x = 0; item_x < item.contentWidth() && result; ++item_x)
{
if (d_content.elementAtLocation(item_x + x, item_y + y) &&
item.isSolidAtLocation(item_x, item_y))
result = false;
}
}
// re-write item into content map if we erased it earlier.
if (already_attached)
writeItemToContentMap(item);
return result;
}
//------------------------------------------------------------------------------//
bool InventoryReceiver::addItemAtLocation(InventoryItem& item, int x, int y)
{
if (itemWillFitAtLocation(item, x, y))
{
InventoryReceiver* old_receiver =
dynamic_cast<InventoryReceiver*>(item.getParent());
if (old_receiver)
old_receiver->removeItem(item);
item.setLocationOnReceiver(x, y);
writeItemToContentMap(item);
addChild(&item);
// set position and size. This ensures the items visually match the
// logical content map.
item.setPosition(UVector2(UDim(static_cast<float>(x) / contentWidth(), 0),
UDim(static_cast<float>(y) / contentHeight(), 0)));
item.setSize(USize(
UDim(static_cast<float>(item.contentWidth()) / contentWidth(), 0),
UDim(static_cast<float>(item.contentHeight()) / contentHeight(), 0)));
return true;
}
return false;
}
//------------------------------------------------------------------------------//
void InventoryReceiver::writeItemToContentMap(const InventoryItem& item)
{
if (item.locationOnReceiverX() == -1 || item.locationOnReceiverY() == -1)
return;
for (int y = 0; y < item.contentHeight(); ++y)
{
const int map_y = item.locationOnReceiverY() + y;
for (int x = 0; x < item.contentWidth(); ++x)
{
const int map_x = item.locationOnReceiverX() + x;
bool val = d_content.elementAtLocation(map_x, map_y) |
item.isSolidAtLocation(x, y);
d_content.setElementAtLocation(map_x, map_y, val);
}
}
invalidate();
}