C++ UIElement::GetIndent方法代码示例

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;
        }
    }
}