ListBox::ListBox( Framework &fw, Control* Owner, VScrollBar* ExternalScrollBar ) : Control( fw, Owner )
{
if( ExternalScrollBar == nullptr )
{
ConfigureInternalScrollBar();
} else {
scroller = ExternalScrollBar;
scroller_is_internal = false;
}
}
void ListBox::Update()
{
Control::Update();
if (scroller == nullptr)
{
ConfigureInternalScrollBar();
}
if (scroller)
{
scroller->Update();
}
}
void ListBox::OnRender()
{
int offset = 0;
if (scroller == nullptr)
{
ConfigureInternalScrollBar();
}
for (auto c = Controls.begin(); c != Controls.end(); c++)
{
auto ctrl = *c;
if (ctrl != scroller)
{
switch (ListOrientation)
{
case Orientation::Vertical:
ctrl->Location.x = 0;
ctrl->Location.y = offset - scroller->GetValue();
if (ItemSize != 0)
{
ctrl->Size.x = (scroller_is_internal ? scroller->Location.x : this->Size.x);
ctrl->Size.y = ItemSize;
}
offset += ctrl->Size.y + ItemSpacing;
break;
case Orientation::Horizontal:
ctrl->Location.x = offset - scroller->GetValue();
ctrl->Location.y = 0;
if (ItemSize != 0)
{
ctrl->Size.x = ItemSize;
ctrl->Size.y = (scroller_is_internal ? scroller->Location.y : this->Size.y);
}
offset += ctrl->Size.x + ItemSpacing;
break;
}
}
}
ResolveLocation();
switch (ListOrientation)
{
case Orientation::Vertical:
scroller->Maximum = std::max(offset - this->Size.y, scroller->Minimum);
break;
case Orientation::Horizontal:
scroller->Maximum = std::max(offset - this->Size.x, scroller->Minimum);
break;
}
scroller->LargeChange =
static_cast<int>(std::max((scroller->Maximum - scroller->Minimum + 2) / 10.0f, 4.0f));
}
void ListBox::Clear()
{
for (auto &c : Controls)
{
c->SetParent(nullptr);
}
Controls.clear();
this->selected = nullptr;
this->hovered = nullptr;
if (scroller_is_internal)
{
ConfigureInternalScrollBar();
}
ResolveLocation();
}
ListBox::ListBox( Framework &fw, Control* Owner ) : Control( fw, Owner )
{
ConfigureInternalScrollBar();
}
