/// <summary>
/// Refreshes the state of the page from the application state or the category
/// page state. This will not be called for initial application launch on
/// navigating to the page, but for either a activation, or returning from the
/// category page.
///
/// </summary>
/// <param name="v">The view model object</param>
/// <param name="forceUseOfAppState">When true, force use of the
/// application state instead of possibly using the category page settings</param>
internal void RefreshStateFromAppState(
MainPageViewModel v,
bool forceUseOfAppState)
{
MainPageState m = ApplicationState.MainPageInformation;
try
{
if (!forceUseOfAppState && ApplicationState.CategoryPageInformation != null)
{
// If we were on the category page, then this object should be
// non null.
CategoryPageState c = ApplicationState.CategoryPageInformation;
if (c.Apply)
{
// Only update from the category page if appropriate
v.Category = c.Category;
this.IsUpperUnitSource = m.IsUpperUnitSource;
v.UpperUnitName = c.SourceUnitName;
v.LowerUnitName = c.TargetUnitName;
this.UserInput = new StringBuilder();
if (!String.IsNullOrEmpty(m.SourceUnitValue))
{
this.UserInput.Append(m.SourceUnitValue);
}
this.CurrentCategory = ApplicationState.UnitCategoryAccess[v.Category];
this.SourceUnit = this.CurrentCategory.UnitAccess[v.UpperUnitName];
this.TargetUnit = this.CurrentCategory.UnitAccess[v.LowerUnitName];
v.UpdateUnitDisplayStrings();
return;
}
}
// Restore the state from the application main page state. App tomb
// stoned from this page, and now we need to restore the state
v.Category = m.Category;
this.IsUpperUnitSource = m.IsUpperUnitSource;
v.UpperUnitName = m.SourceUnitName;
v.LowerUnitName = m.TargetUnitName;
this.UserInput = new StringBuilder();
if (!String.IsNullOrEmpty(m.SourceUnitValue))
{
this.UserInput.Append(m.SourceUnitValue);
}
this.CurrentCategory = ApplicationState.UnitCategoryAccess[v.Category];
this.SourceUnit = this.CurrentCategory.UnitAccess[v.UpperUnitName];
this.TargetUnit = this.CurrentCategory.UnitAccess[v.LowerUnitName];
v.UpdateUnitDisplayStrings();
}
catch (Exception e)
{
ApplicationState.ErrorLog.Add(new ErrorLog("RefreshStateFromAppState", e.Message));
}
}
/// <summary>
/// Syncs the state of this page to the central application state object.
/// </summary>
/// <param name="category">The current category.</param>
/// <param name="upperUnitName">Name of the upper unit.</param>
/// <param name="lowerUnitName">Name of the lower unit.</param>
internal void SyncStateToAppState(
string category,
string upperUnitName,
string lowerUnitName)
{
if (ApplicationState.MainPageInformation == null)
{
ApplicationState.MainPageInformation = new MainPageState();
}
MainPageState m = ApplicationState.MainPageInformation;
m.IsUpperUnitSource = this.IsUpperUnitSource;
m.SourceUnitValue = this.UserInput.ToString();
m.UpdateNames(category, upperUnitName, lowerUnitName);
}
/// <summary>
/// Sets the default category and units.
/// Used when the application first starts
/// </summary>
/// <param name="sourceUnitName">Name of the source unit.</param>
/// <param name="targetUnitName">Name of the target unit.</param>
internal void SetDefaultCategoryAndUnits(
out string sourceUnitName,
out string targetUnitName)
{
string categorySelection = ApplicationState.SupportedConversions[0].CategoryLocalized;
this.CurrentCategory = ApplicationState.UnitCategoryAccess[categorySelection];
MainPageState m = ApplicationState.MainPageInformation;
m.IsUpperUnitSource = this.IsUpperUnitSource;
if (this.IsUpperUnitSource)
{
sourceUnitName = this.CurrentCategory.Units[0].NameLocalized;
targetUnitName = this.CurrentCategory.Units[1].NameLocalized;
}
else
{
sourceUnitName = this.CurrentCategory.Units[1].NameLocalized;
targetUnitName = this.CurrentCategory.Units[0].NameLocalized;
}
this.SourceUnit = this.CurrentCategory.UnitAccess[sourceUnitName];
this.TargetUnit = this.CurrentCategory.UnitAccess[targetUnitName];
}