/*!********************************************************************

   Audacity: A Digital Audio Editor

   @file ListNavigationEnabled.cpp

   @author Vitaly Sverchinsky

**********************************************************************/

#include "ListNavigationEnabled.h"

void ListNavigationEnabled_HandleCharHook(wxWindow* self, wxKeyEvent& evt)
{
   //We want to restore focus to list item once arrow navigation is used
   //on the child item, for this we need a char hook since key/navigation
   //events are sent directly to the focused item
   const auto keyCode = evt.GetKeyCode();
   if((keyCode == WXK_DOWN || keyCode == WXK_UP) &&
      !self->HasFocus() &&
      self->IsDescendant(wxWindow::FindFocus()))
   {
      self->SetFocusFromKbd();
   }
   else
      evt.Skip();
}

void ListNavigationEnabled_HandleKeyDown(wxWindow* self, wxKeyEvent& evt)
{
   const auto keyCode = evt.GetKeyCode();
   if(keyCode == WXK_TAB)
      self->NavigateIn(wxNavigationKeyEvent::FromTab | (evt.ShiftDown() ? wxNavigationKeyEvent::IsBackward : wxNavigationKeyEvent::IsForward));
   else if(keyCode == WXK_DOWN)
      self->Navigate(wxNavigationKeyEvent::IsForward);
   else if(keyCode == WXK_UP)
      self->Navigate(wxNavigationKeyEvent::IsBackward);
   else
      evt.Skip();
}

void ListNavigationEnabled_HandleNavigationKeyEvent(wxWindow* self, wxNavigationKeyEvent& evt)
{
   if(evt.GetEventObject() == self->GetParent() && !evt.IsFromTab())
      self->SetFocusFromKbd();
   else if(evt.GetEventObject() == self && evt.GetCurrentFocus() == self && evt.IsFromTab())
   {
      //NavigateIn
      wxPropagationDisabler disableProp(evt);
      const auto isForward = evt.GetDirection();
      const auto& children = self->GetChildren();
      auto node = isForward ? children.GetFirst() : children.GetLast();
      while(node)
      {
         auto child = node->GetData();
         if(child->CanAcceptFocusFromKeyboard())
         {
            if(!child->GetEventHandler()->ProcessEvent(evt))
            {
               child->SetFocusFromKbd();
            }
            evt.Skip(false);
            return;
         }
         node = isForward ? node->GetNext() : node->GetPrevious();
      }
   }
   else
      evt.Skip();
}

void ListNavigationEnabled_HandleDestroy(wxWindow* self)
{
   if(self->IsDescendant(wxWindow::FindFocus()))
   {
      auto next = self->GetNextSibling();
      if(next != nullptr && next->AcceptsFocus())
         next->SetFocus();
      else
      {
         auto prev = self->GetPrevSibling();
         if(prev != nullptr && prev->AcceptsFocus())
            prev->SetFocus();
      }
   }
}
