C++ CGUIControl::CanFocus方法代码示例

bool CGUIControlGroupList::IsLastFocusableControl(const CGUIControl *control) const
{
  for (crControls it = m_children.rbegin(); it != m_children.rend(); ++it)
  {
    CGUIControl *child = *it;
    if (child->IsVisible() && child->CanFocus())
    { // found first focusable
      return child == control;
    }
  }
  return false;
}

void CGUIWindow::DoProcess(unsigned int currentTime, CDirtyRegionList &dirtyregions)
{
  g_graphicsContext.SetRenderingResolution(m_coordsRes, m_needsScaling);
  g_graphicsContext.AddGUITransform();
  CGUIControlGroup::DoProcess(currentTime, dirtyregions);
  g_graphicsContext.RemoveTransform();

  // check if currently focused control can have it
  // and fallback to default control if not
  CGUIControl* focusedControl = GetFocusedControl();
  if (focusedControl && !focusedControl->CanFocus())
    SET_CONTROL_FOCUS(m_defaultControl, 0);
}

void CGUIWindow::DoProcess(unsigned int currentTime, CDirtyRegionList &dirtyregions)
{
  if (!IsControlDirty() && CServiceBroker::GetSettingsComponent()->GetAdvancedSettings()->m_guiSmartRedraw)
    return;

  CServiceBroker::GetWinSystem()->GetGfxContext().SetRenderingResolution(m_coordsRes, m_needsScaling);
  CServiceBroker::GetWinSystem()->GetGfxContext().AddGUITransform();
  CGUIControlGroup::DoProcess(currentTime, dirtyregions);
  CServiceBroker::GetWinSystem()->GetGfxContext().RemoveTransform();

  // check if currently focused control can have it
  // and fallback to default control if not
  CGUIControl* focusedControl = GetFocusedControl();
  if (focusedControl && !focusedControl->CanFocus())
    SET_CONTROL_FOCUS(m_defaultControl, 0);
}

// in the case of id == 0, we don't match id
CGUIControl *CGUIControlGroup::GetFirstFocusableControl(int id)
{
  if (!CanFocus()) return NULL;
  if (id && id == (int) GetID()) return this; // we're focusable and they want us
  for (iControls it = m_children.begin(); it != m_children.end(); ++it)
  {
    CGUIControl* pControl = *it;
    if (pControl->IsGroup())
    {
      CGUIControlGroup *group = (CGUIControlGroup *)pControl;
      CGUIControl *control = group->GetFirstFocusableControl(id);
      if (control) return control;
    }
    if ((!id || (int) pControl->GetID() == id) && pControl->CanFocus())
      return pControl;
  }
  return NULL;
}

bool CGUIControlGroupList::OnMessage(CGUIMessage& message)
{
  switch (message.GetMessage() )
  {
  case GUI_MSG_FOCUSED:
    { // a control has been focused
      // scroll if we need to and update our page control
      ValidateOffset();
      float offset = 0;
      for (iControls it = m_children.begin(); it != m_children.end(); ++it)
      {
        CGUIControl *control = *it;
        if (!control->IsVisible())
          continue;
        if (control->GetID() == message.GetControlId())
        {
          // find out whether this is the first or last control
          if (IsFirstFocusableControl(control))
            ScrollTo(0);
          else if (IsLastFocusableControl(control))
            ScrollTo(m_totalSize - Size());
          else if (offset < m_scroller.GetValue())
            ScrollTo(offset);
          else if (offset + Size(control) > m_scroller.GetValue() + Size())
            ScrollTo(offset + Size(control) - Size());
          break;
        }
        offset += Size(control) + m_itemGap;
      }
    }
    break;
  case GUI_MSG_SETFOCUS:
    {
      // we've been asked to focus.  We focus the last control if it's on this page,
      // else we'll focus the first focusable control from our offset (after verifying it)
      ValidateOffset();
      // now check the focusControl's offset
      float offset = 0;
      for (iControls it = m_children.begin(); it != m_children.end(); ++it)
      {
        CGUIControl *control = *it;
        if (!control->IsVisible())
          continue;
        if (control->GetID() == m_focusedControl)
        {
          if (IsControlOnScreen(offset, control))
            return CGUIControlGroup::OnMessage(message);
          break;
        }
        offset += Size(control) + m_itemGap;
      }
      // find the first control on this page
      offset = 0;
      for (iControls it = m_children.begin(); it != m_children.end(); ++it)
      {
        CGUIControl *control = *it;
        if (!control->IsVisible())
          continue;
        if (control->CanFocus() && IsControlOnScreen(offset, control))
        {
          m_focusedControl = control->GetID();
          break;
        }
        offset += Size(control) + m_itemGap;
      }
    }
    break;
  case GUI_MSG_PAGE_CHANGE:
    {
      if (message.GetSenderId() == m_pageControl)
      { // it's from our page control
        ScrollTo((float)message.GetParam1());
        return true;
      }
    }
    break;
  }
  return CGUIControlGroup::OnMessage(message);
}