/// <summary>
/// Restores the user selections. This can be used when we are navigating from
/// the main page, or are returning from a tombstone operation.
/// </summary>
internal static void RestoreUserSelections()
{
CategoryPageState p = ApplicationState.CategoryPageInformation;
// If we are on the favorite tab, we handle the data binding differently
if (p.IsFavorite)
{
return;
}
// In case the user does not make any changes or selections, we need to have the data
// to send back to the main page, so we select the current conversion units
CategoryInformation c = ApplicationState.UnitCategoryAccess[p.Category];
try
{
if ((p.SourceUnitName != null) && (c.PivotUnitSelect.fromListView.ItemsSource != null))
{
c.PivotUnitSelect.fromListView.SelectedItem = c.FindUnit(p.SourceUnitName);
}
else
{
c.PivotUnitSelect.fromListView.SelectedIndex = -1;
}
if ((p.TargetUnitName != null) && (c.PivotUnitSelect.toListView.ItemsSource != null))
{
c.PivotUnitSelect.toListView.SelectedItem = c.FindUnit(p.TargetUnitName);
}
else
{
c.PivotUnitSelect.toListView.SelectedIndex = -1;
}
}
catch (Exception e)
{
ApplicationState.ErrorLog.Add(new ErrorLog("RestoreUserSelections", e.Message));
c.PivotUnitSelect.fromListView.SelectedIndex = -1;
c.PivotUnitSelect.toListView.SelectedIndex = -1;
}
}
/// <summary>
/// Syncs the state of selections on this page to the main application state
/// objetc. THis will be used for either Tombstone support, or returning to the main
/// application page
/// </summary>
/// <param name="pivotIndex">Index of the page in the pivot control</param>
internal void SyncStateToAppState(Int32 pivotIndex)
{
CategoryPageState c = ApplicationState.CategoryPageInformation;
ApplicationState.CategoryPageInformation.PivotSelectedIndex = pivotIndex;
// We may have an invalid unit category if we chose a favorite and then deleted
// it, in which case the user has not made a selection. We will set the
// apply flag to false so that the main page will not try to apply the settings
// from this page.
if (!String.IsNullOrEmpty(c.Category))
{
// Favorite category is not in the list of supported categories, because
// it is not in the XML file.
if (ApplicationState.UnitCategoryAccess.ContainsKey(c.Category))
{
// Non favorite category selection
CategoryInformation category = ApplicationState.UnitCategoryAccess[c.Category];
// We only set the selection information back on the app for use on the main
// page if it's valid. The user must have chosen an item for the to and from
// unit list on the same category.
// Our category is only updated once we've made a selection
// in both the to/from list boxes in order
// for the main page to update the conversion information
if (!(category.IsUnit(c.SourceUnitName) && category.IsUnit(c.TargetUnitName)))
{
// The unit selections are not both valid. Don't apply any change
c.Apply = false;
}
}
else
{
// Favorite category case
c.Apply = this.lastSelectedFavorite != null ? true : false;
}
}
else
{
c.Apply = false;
}
}