/**
* Pushes a browse state to the browse stack.
*/
internal void Push(AbstractBrowseState state)
{
if (_showingState)
{
return;
}
// remove entries on the top of the stack
int removeCount = _browseStack.Count - _browseStackPos - 1;
if (removeCount > 0)
{
for (int i = _browseStackPos + 1; i < _browseStack.Count; i++)
{
AbstractBrowseState oldState = (AbstractBrowseState)_browseStack [i];
oldState.Dispose();
}
_browseStack.RemoveRange(_browseStackPos + 1, removeCount);
}
while (_browseStack.Count > _maxBrowseStackSize)
{
AbstractBrowseState oldState = (AbstractBrowseState)_browseStack [0];
oldState.Dispose();
_browseStack.RemoveAt(0);
_browseStackPos--;
}
if (_browseStack.Count > 0)
{
SaveSelectedResource(_browseStack.Count - 1);
}
_browseStack.Add(state);
_browseStackPos++;
}
/**
* Save the currently selected resource at the specified position
* in the browse stack.
*/
private void SaveSelectedResource(int browseStackPos)
{
if (browseStackPos < 0 || browseStackPos >= _browseStack.Count)
{
return;
}
AbstractBrowseState browseState = (AbstractBrowseState)_browseStack [browseStackPos];
IResourceList selection = _owner.SelectedResources;
if (selection.Count > 0 && selection.ResourceIds [0] != -1)
{
browseState.SetSelectedResource(selection [0]);
}
else
{
browseState.SetSelectedResource(null);
}
}
/**
* Shows the browse state at the current stack position, or the previous
* valid browse state.
*/
internal void ShowCurrentBrowseState()
{
_showingState = true;
try
{
while (_browseStackPos >= 0)
{
AbstractBrowseState state = (AbstractBrowseState)_browseStack [_browseStackPos];
// if the state failed to show, switch to previous state
if (state.Show(_owner))
{
break;
}
_browseStack.Remove(state);
_browseStackPos--;
}
}
finally
{
_showingState = false;
}
}