C++ UIElement::SetSelected方法代码示例

void DropDownList::GetBatches(ea::vector<UIBatch>& batches, ea::vector<float>& vertexData, const IntRect& currentScissor)
{
    Menu::GetBatches(batches, vertexData, currentScissor);

    if (!placeholder_->IsVisible())
        return;

    UIElement* selectedItem = GetSelectedItem();
    if (selectedItem)
    {
        // Can not easily copy the selected item. However, it can be re-rendered on the placeholder's position
        const IntVector2& targetPos = placeholder_->GetScreenPosition();
        const IntVector2& originalPos = selectedItem->GetScreenPosition();
        IntVector2 offset = targetPos - originalPos;

        // GetBatches() usually resets the hover flag. Therefore get its value and then reset it for the real rendering
        // Render the selected item without its selection color, so temporarily reset the item's selected attribute
        bool hover = selectedItem->IsHovering();
        selectedItem->SetSelected(false);
        selectedItem->SetHovering(false);
        selectedItem->GetBatchesWithOffset(offset, batches, vertexData, currentScissor);
        selectedItem->SetSelected(true);
        selectedItem->SetHovering(hover);
    }
}

void ListView::UpdateSelectionEffect()
{
    unsigned numItems = GetNumItems();
    bool highlighted = highlightMode_ == HM_ALWAYS || HasFocus();

    for (unsigned i = 0; i < numItems; ++i)
    {
        UIElement* item = GetItem(i);
        if (highlightMode_ != HM_NEVER && selections_.Contains(i))
            item->SetSelected(highlighted);
        else
            item->SetSelected(false);
    }
}

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;
        }
    }
}