/// <summary>
/// Attempts to open the level at the specified index either for playing or editing.
/// </summary>
/// <param name="index">The index of the level to be opened, or null to deselect the current level.</param>
/// <param name="state">Must be <see cref="LevelListBoxState.Playing"/> or <see cref="LevelListBoxState.Editing"/>. Ignored if index is null.</param>
private void setActiveLevel(int?index, LevelListBoxState state)
{
if (LevelActivating != null)
{
// Confirm with the owner that the level can be changed
ConfirmEventArgs args = new ConfirmEventArgs {
ConfirmOK = true
};
LevelActivating(this, args);
if (!args.ConfirmOK)
{
return;
}
}
if (index == null)
{
_activeLevelIndex = null;
}
else if (index.Value < 0 || index.Value >= Items.Count || !(Items[index.Value] is SokobanLevel))
{
Ut.InternalError();
}
else
{
SokobanLevelStatus status;
if (state == LevelListBoxState.Playing && (status = ((SokobanLevel)Items[index.Value]).Validity) != SokobanLevelStatus.Valid)
{
string problem = status == SokobanLevelStatus.NotEnclosed
? Program.Tr.Mainform_Validity_NotEnclosed
: Program.Tr.Mainform_Validity_WrongNumber;
if (DlgMessage.Show(Program.Tr.Mainform_Validity_CannotOpen + "\n\n" + problem + "\n\n" + Program.Tr.Mainform_Validity_CannotOpen_Fix,
Program.Tr.Mainform_MessageTitle_OpenLevel, DlgType.Error, Program.Tr.Mainform_Validity_CannotOpen_btnEdit, Program.Tr.Dialogs_btnCancel) == 0)
{
_state = LevelListBoxState.Editing;
_activeLevelIndex = index.Value;
}
else
{
return;
}
}
else
{
_state = state;
_activeLevelIndex = index.Value;
}
}
RefreshItems();
// Inform the owner that the level has changed
LevelActivated(this, new EventArgs());
// Make the active level selected
SelectActiveLevel();
}
/// <summary>
/// Called by the level list to verify that it is OK to switch levels.
/// </summary>
private void levelActivating(object sender, ConfirmEventArgs e)
{
e.ConfirmOK = ctMainArea.MayDestroy(Program.Tr.Mainform_MessageTitle_OpenLevel);
}
