C++ UIElement::GetHeight方法代码示例

void DropDownList::OnShowPopup()
{
    // Resize the popup to match the size of the list content, and optionally match the button width
    UIElement* content = listView_->GetContentElement();
    content->UpdateLayout();
    const IntVector2& contentSize = content->GetSize();
    const IntRect& border = popup_->GetLayoutBorder();
    popup_->SetSize(resizePopup_ ? GetWidth() : contentSize.x_ + border.left_ + border.right_, contentSize.y_ + border.top_ +
        border.bottom_);

    // Check if popup fits below the button. If not, show above instead
    bool showAbove = false;
    UIElement* root = GetRoot();
    if (root)
    {
        const IntVector2& screenPos = GetScreenPosition();
        if (screenPos.y_ + GetHeight() + popup_->GetHeight() > root->GetHeight() && screenPos.y_ - popup_->GetHeight() >= 0)
            showAbove = true;
    }
    SetPopupOffset(0, showAbove ? -popup_->GetHeight() : GetHeight());
}

void ListView::OnKey(int key, int buttons, int qualifiers)
{
    // If no selection, can not move with keys
    unsigned numItems = GetNumItems();
    unsigned selection = GetSelection();

    // If either shift or ctrl held down, add to selection if multiselect enabled
    bool additive = multiselect_ && qualifiers & (QUAL_SHIFT | QUAL_CTRL);
    int delta = M_MAX_INT;
    int pageDirection = 1;

    if (numItems)
    {
        if (selection != M_MAX_UNSIGNED && qualifiers & QUAL_CTRL && key == KEY_C)
        {
            CopySelectedItemsToClipboard();
            return;
        }

        switch (key)
        {
        case KEY_LEFT:
        case KEY_RIGHT:
            if (selection != M_MAX_UNSIGNED && hierarchyMode_)
            {
                Expand(selection, key == KEY_RIGHT);
                return;
            }
            break;

        case KEY_RETURN:
        case KEY_RETURN2:
        case KEY_KP_ENTER:
            if (selection != M_MAX_UNSIGNED && hierarchyMode_)
            {
                ToggleExpand(selection);
                return;
            }
            break;

        case KEY_UP:
            delta = -1;
            break;

        case KEY_DOWN:
            delta = 1;
            break;

        case KEY_PAGEUP:
            pageDirection = -1;
            // Fallthru

        case KEY_PAGEDOWN:
            {
                // Convert page step to pixels and see how many items have to be skipped to reach that many pixels
                if (selection == M_MAX_UNSIGNED)
                    selection = 0;      // Assume as if first item is selected
                int stepPixels = ((int)(pageStep_ * scrollPanel_->GetHeight())) - contentElement_->GetChild(selection)->GetHeight();
                unsigned newSelection = selection;
                unsigned okSelection = selection;
                unsigned invisible = 0;
                while (newSelection < numItems)
                {
                    UIElement* item = GetItem(newSelection);
                    int height = 0;
                    if (item->IsVisible())
                    {
                        height = item->GetHeight();
                        okSelection = newSelection;
                    }
                    else
                        ++invisible;
                    if (stepPixels < height)
                        break;
                    stepPixels -= height;
                    newSelection += pageDirection;
                }
                delta = okSelection - selection - pageDirection * invisible;
            }
            break;

        case KEY_HOME:
            delta = -(int)GetNumItems();
            break;

        case KEY_END:
            delta = GetNumItems();
            break;

        default: break;
        }
    }

    if (delta != M_MAX_INT)
    {
        ChangeSelection(delta, additive);
        return;
    }

    using namespace UnhandledKey;
//.........这里部分代码省略.........