async void CheckForSavedInfo()
{
if (await FileHelper.ExistsAsync(App.TransientFilename))
{
// Read the file.
string str = await FileHelper.ReadTextAsync(App.TransientFilename);
// Delete the file.
await FileHelper.DeleteFileAsync(App.TransientFilename);
// Break down the file contents.
string[] contents = str.Split('\x1F');
string filename = contents[0];
bool isNoteEdit = Boolean.Parse(contents[1]);
string entryText = contents[2];
string editorText = contents[3];
// Create the Note object and initialize it with saved data.
Note note = new Note(filename);
note.Title = entryText;
note.Text = editorText;
// Navigate to NotePage.
NotePage notePage = new NotePage(note, isNoteEdit);
await this.Navigation.PushAsync(notePage);
}
}
public HomePage()
{
this.Title = "Note Taker";
// Create and initialize ListView.
ListView listView = new ListView
{
ItemsSource = App.NoteFolder.Notes,
ItemTemplate = new DataTemplate(typeof(TextCell)),
VerticalOptions = LayoutOptions.FillAndExpand
};
listView.ItemTemplate.SetBinding(TextCell.TextProperty, "Identifier");
// Handle item selection for editing and deleting.
listView.ItemSelected += (sender, args) =>
{
if (args.SelectedItem != null)
{
// Deselect the item.
listView.SelectedItem = null;
// Navigate to NotePage.
Note note = (Note)args.SelectedItem;
this.Navigation.PushAsync(new NotePage(note, true));
}
};
// Create and initialize ToolbarItem.
ToolbarItem addNewItem = new ToolbarItem
{
Name = "Add Note",
Icon = Device.OnPlatform("new.png",
"ic_action_new.png",
"Images/add.png"),
Order = ToolbarItemOrder.Primary
};
addNewItem.Activated += (sender, args) =>
{
// Create unique filename.
DateTime datetime = DateTime.UtcNow;
string filename = datetime.ToString("yyyyMMddHHmmssfff") + ".note";
// Navigate to new NotePage.
Note note = new Note(filename);
this.Navigation.PushAsync(new NotePage(note));
};
this.ToolbarItems.Add(addNewItem);
// Assemble page.
this.Content = listView;
CheckForSavedInfo();
}
public void Restore(string prefix)
{
Application app = Application.Current;
// Create a new Note object.
Note note = new Note((string)app.Properties["fileName"])
{
Title = (string)app.Properties["title"],
Text = (string)app.Properties["text"]
};
// Set the properties of this class.
Note = note;
IsNoteEdit = (bool)app.Properties["isNoteEdit"];
}
async void GetFilesAsync()
{
// Sort the filenames.
IEnumerable<string> filenames =
from filename in await FileHelper.GetFilesAsync()
where filename.EndsWith(".note")
orderby (filename)
select filename;
// Store them in the Notes collection.
foreach (string filename in filenames)
{
Note note = new Note(filename);
await note.LoadAsync();
this.Notes.Add(note);
}
}
public NotePage(Note note, bool isNoteEdit = false)
{
// Initialize Note object
this.note = note;
this.isNoteEdit = isNoteEdit;
Title = isNoteEdit ? "Edit Note" : "New Note";
// Create Entry and Editor views.
Entry entry = new Entry
{
Placeholder = "Title (optional)"
};
Editor editor = new Editor
{
Keyboard = Keyboard.Create(KeyboardFlags.All),
BackgroundColor = Device.OnPlatform(Color.Default,
Color.Default,
Color.White),
VerticalOptions = LayoutOptions.FillAndExpand
};
// Set data bindings.
this.BindingContext = note;
entry.SetBinding(Entry.TextProperty, "Title");
editor.SetBinding(Editor.TextProperty, "Text");
// Assemble page.
StackLayout stackLayout = new StackLayout
{
Children =
{
new Label { Text = "Title:" },
entry,
new Label { Text = "Note:" },
editor,
}
};
if (isNoteEdit)
{
// Cancel toolbar item.
ToolbarItem cancelItem = new ToolbarItem
{
Name = "Cancel",
Icon = Device.OnPlatform("cancel.png",
"ic_action_cancel.png",
"Images/cancel.png"),
Order = ToolbarItemOrder.Primary
};
cancelItem.Activated += async (sender, args) =>
{
bool confirm = await this.DisplayAlert("Note Taker",
"Cancel note edit?",
"Yes", "No");
if (confirm)
{
// Reload note.
await note.LoadAsync();
// Return to home page.
await this.Navigation.PopAsync();
}
};
this.ToolbarItems.Add(cancelItem);
// Delete toolbar item.
ToolbarItem deleteItem = new ToolbarItem
{
Name = "Delete",
Icon = Device.OnPlatform("discard.png",
"ic_action_discard.png",
"Images/delete.png"),
Order = ToolbarItemOrder.Primary
};
deleteItem.Activated += async (sender, args) =>
{
bool confirm = await this.DisplayAlert("Note Taker",
"Delete this note?",
"Yes", "No");
if (confirm)
{
// Delete Note file and remove from collection.
await note.DeleteAsync();
App.NoteFolder.Notes.Remove(note);
// Return to home page.
await this.Navigation.PopAsync();
}
};
this.ToolbarItems.Add(deleteItem);
}
this.Content = stackLayout;
}