/// <summary>
/// Method callback for when the edit button is clicked.
/// </summary>
/// <param name="sender">Object that sent the click event.</param>
/// <param name="e">Event arguments for the click event.</param>
private async void EditButton_Clicked(object sender,
System.EventArgs e)
{
// Only continue execution if the page is unlocked
if (this.locked)
{
return;
}
this.locked = true;
// Create the page to edit the horse and navigate to it
Page page = new HorseEditPage(this.horse);
await this.Navigation.PushAsync(page, true);
// Unlock the current page after navigation has occurred
this.locked = false;
}
/// <summary>
/// Method to be called when the "add horse" button is pressed.
/// </summary>
/// <param name="sender">The item that triggers the event.</param>
/// <param name="e">The event args for the event.</param>
private void AddHorseButton_Clicked(object sender, EventArgs e)
{
// If the current modal page is set to be locked, do not render a
// horse modal page
if (this.locked)
{
return;
}
// Lock the main thread from opening another page until the current
// modal display has been closed
this.locked = true;
// Invoke a separate operation to create a horse.
Device.BeginInvokeOnMainThread(async() => {
try {
// Prompt the user for the type of horse that they want to
// create, from the types that are available.
const string StandardHorseString = "Standard";
const string MiniatureHorseString = "Miniature";
const string CancelString = "Cancel";
string result = await this.DisplayActionSheet(
"Select A Horse Type",
CancelString,
null,
StandardHorseString,
MiniatureHorseString);
// Handle the result accordingly
HorseType type = HorseType.Standard;
switch (result)
{
// Handle when a standard horse is selected
case StandardHorseString:
type = HorseType.Standard;
break;
// Handle when a miniature horse is selected
case MiniatureHorseString:
type = HorseType.Miniature;
break;
// Handle when the "cancel" button was pressed, or the
// user selects outside the bounds of the select.
case CancelString:
default:
return;
}
// Get a new horse from the horse manager
Horse horse = await HorseManager.GetInstance()
.Create(type);
// Push a modal to the top of the navigation stack to
// display the selected horse's information
Page horsePage = new HorseEditPage(horse);
await this.Navigation.PushAsync(horsePage);
} catch (TooManyHorsesException) {
// Show a toast indicating that the horse could not be found
ToastController.ShortToast("Cannot create any more horses.");
} finally {
// Unlock the page after the modal has been created
this.locked = false;
}
});
}