/// <summary>
/// Set up and show a vehicle data window for a unit.
/// </summary>
/// <param name="unit">Unit to display</param>
private void ShowVcleData(IUnitViewModel unit)
{
VehicleDataWindow window;
if (this.vcleWindows.Exists(vw => vw.DataContext == unit))
{
window = this.vcleWindows.Find(vw => vw.DataContext == unit);
}
else
{
window =
new VehicleDataWindow
{
DataContext = unit
};
if (unit.JourneysList != null)
{
window.SetUpGraph(unit.JourneysList);
}
else
{
window.SetUpGraph(new List <IJourneyViewModel>());
}
window.Closed += this.VcleDataWindowClosed;
this.vcleWindows.Add(window);
}
window.Show();
window.Activate();
}
/// <summary>
/// Change the data context of an existing window to display the indicated unit.
/// Update the graphs.
/// </summary>
/// <remarks>
/// The command is rejected if there is a window which already displays the indicated unit.
/// In that case, the other window is focused.
/// </remarks>
/// <param name="window">Window to change</param>
/// <param name="unit">Unit to display on the window</param>
private void ChangeWindowUnit(
VehicleDataWindow window,
IUnitViewModel unit)
{
// Focus on an existing window if one already exists.
if (this.vcleWindows.Exists(vw => vw.DataContext == unit))
{
VehicleDataWindow existingWindow =
this.vcleWindows.Find(
vw => vw.DataContext == unit);
existingWindow.Show();
existingWindow.Activate();
return;
}
if (window == null)
{
Logger.Instance.WriteLog("SubClassViewModel: failed to change unit in a window, failed to find valid window");
return;
}
window.DataContext = unit;
if (unit.JourneysList != null)
{
window.SetUpGraph(unit.JourneysList);
}
else
{
window.SetUpGraph(new List <IJourneyViewModel>());
}
}
/// <summary>
/// Close a vehicle data window.
/// </summary>
/// <param name="unit">unit to close</param>
private void CloseVcleData(IUnitViewModel unit)
{
if (this.vcleWindows.Exists(vw => vw.DataContext == unit))
{
this.vcleWindows.Find(vw => vw.DataContext == unit).Close();
}
}
/// <summary>
/// Find and return the index of a unit.
/// </summary>
/// <param name="unit">unit to search for</param>
/// <returns>found index</returns>
private int?GetUnitIndex(IUnitViewModel unit)
{
for (int index = 0; index < this.Units?.Count; ++index)
{
if (this.Units[index] == unit)
{
return(index);
}
}
return(null);
}
/// <summary>
/// Display the previous unit.
/// </summary>
/// <param name="unit">Unit to display</param>
private void PreviousUnit(IUnitViewModel unit)
{
int?index = this.GetUnitIndex(unit);
if (index != null &&
index > 0)
{
VehicleDataWindow window = this.vcleWindows.Find(vw => vw.DataContext == unit);
this.ChangeWindowUnit(
window,
this.Units[(int)index - 1]);
}
}
