void ListView::Expand(unsigned index, bool enable, bool recursive)
{
if (!hierarchyMode_)
return;
unsigned numItems = GetNumItems();
if (index >= numItems)
return;
UIElement* item = GetItem(index++);
SetItemExpanded(item, enable);
int baseIndent = item->GetIndent();
PODVector<bool> expanded((unsigned)(baseIndent + 1));
expanded[baseIndent] = enable;
contentElement_->DisableLayoutUpdate();
while (index < numItems)
{
item = GetItem(index++);
int indent = item->GetIndent();
if (indent <= baseIndent)
break;
// Propagate the state to children when it is recursive
if (recursive)
SetItemExpanded(item, enable);
// Use the parent expanded flag to influence the visibility of its children
bool visible = enable && expanded[indent - 1];
item->SetVisible(visible);
if (indent >= (int)expanded.Size())
expanded.Resize((unsigned)(indent + 1));
expanded[indent] = visible && GetItemExpanded(item);
}
contentElement_->EnableLayoutUpdate();
contentElement_->UpdateLayout();
}
void ListView::RemoveItem(UIElement* item, unsigned index)
{
if (!item)
return;
unsigned numItems = GetNumItems();
for (unsigned i = index; i < numItems; ++i)
{
if (GetItem(i) == item)
{
item->SetSelected(false);
selections_.Remove(i);
unsigned removed = 1;
if (hierarchyMode_)
{
// Remove any child items in hierarchy mode
if (GetItemHierarchyParent(item))
{
int baseIndent = item->GetIndent();
for (unsigned j = i + 1; ; ++j)
{
UIElement* childItem = GetItem(i + 1);
if (!childItem)
break;
if (childItem->GetIndent() > baseIndent)
{
childItem->SetSelected(false);
selections_.Erase(j);
contentElement_->RemoveChildAtIndex(i + 1);
overlayContainer_->RemoveChildAtIndex(i + 1);
++removed;
}
else
break;
}
}
// Check if the parent of removed item still has other children
if (i > 0)
{
int baseIndent = item->GetIndent();
UIElement* prevKin = GetItem(i - 1); // Could be parent or sibling
if (prevKin->GetIndent() < baseIndent)
{
UIElement* nextKin = GetItem(i + 1); // Could be sibling or parent-sibling or 0 if index out of bound
if (!nextKin || nextKin->GetIndent() < baseIndent)
{
// If we reach here then the parent has no other children
SetItemHierarchyParent(prevKin, false);
}
}
}
// Remove the overlay at the same index
overlayContainer_->RemoveChildAtIndex(i);
}
// If necessary, shift the following selections
if (!selections_.Empty())
{
for (unsigned j = 0; j < selections_.Size(); ++j)
{
if (selections_[j] > i)
selections_[j] -= removed;
}
UpdateSelectionEffect();
}
contentElement_->RemoveChildAtIndex(i);
break;
}
}
}