protected override void OnElementPropertyChanged(System.ComponentModel.PropertyChangedEventArgs args)
{
if (args.PropertyName == AccessibilityEffect.AccessibilityLabelProperty.PropertyName)
{
Control.AccessibilityLabel = AccessibilityEffect.GetAccessibilityLabel(Element);
}
else if (args.PropertyName == AccessibilityEffect.AccessibilityHintProperty.PropertyName)
{
Control.AccessibilityHint = AccessibilityEffect.GetAccessibilityHint(Element);
}
else if (args.PropertyName == AccessibilityEffect.AccessibilityIDProperty.PropertyName)
{
Control.AccessibilityIdentifier = AccessibilityEffect.GetAccessibilityID(Element);
}
else if (args.PropertyName == AccessibilityEffect.InAccessibleTreeProperty.PropertyName)
{
Control.IsAccessibilityElement = AccessibilityEffect.GetInAccessibleTree(Element);
}
else if (args.PropertyName == AccessibilityEffect.AccessibilityTraitsProperty.PropertyName)
{
SetTraits();
}
else
{
base.OnElementPropertyChanged(args);
}
}
protected override void OnAttached()
{
try
{
Control.AccessibilityLabel = AccessibilityEffect.GetAccessibilityLabel(Element);
Control.AccessibilityHint = AccessibilityEffect.GetAccessibilityHint(Element);
Control.AccessibilityIdentifier = AccessibilityEffect.GetAccessibilityID(Element);
Control.IsAccessibilityElement = AccessibilityEffect.GetInAccessibleTree(Element);
SetTraits();
}
catch (Exception ex)
{
Console.WriteLine("Cannot set property on attached control. Error: ", ex.Message);
}
}
protected override void OnAttached()
{
try
{
Control.ContentDescription = AccessibilityEffect.GetAccessibilityLabel(Element);
if (Control is TextView)
{
(Control as TextView).Hint = AccessibilityEffect.GetAccessibilityHint(Element);
}
Control.Focusable = AccessibilityEffect.GetInAccessibleTree(Element);
}
catch (Exception ex)
{
Console.WriteLine("Cannot set property on attached control. Error: ", ex.Message);
}
}
void SetTraits()
{
var tempTraits = Control.AccessibilityTraits;
var newTraits = AccessibilityEffect.GetAccessibilityTraits(Element);
if ((newTraits & AccessibilityTrait.Button) > 0)
{
tempTraits = tempTraits | UIAccessibilityTrait.Button;
}
if ((newTraits & AccessibilityTrait.Header) > 0)
{
tempTraits = tempTraits | UIAccessibilityTrait.Header;
}
Control.AccessibilityTraits = tempTraits;
}
protected override void OnElementPropertyChanged(System.ComponentModel.PropertyChangedEventArgs args)
{
if (args.PropertyName == AccessibilityEffect.AccessibilityLabelProperty.PropertyName)
{
Control.ContentDescription = AccessibilityEffect.GetAccessibilityLabel(Element);
}
else if (args.PropertyName == AccessibilityEffect.AccessibilityHintProperty.PropertyName)
{
if (Control is TextView)
{
(Control as TextView).Hint = AccessibilityEffect.GetAccessibilityHint(Element);
}
}
else if (args.PropertyName == AccessibilityEffect.InAccessibleTreeProperty.PropertyName)
{
Control.Focusable = AccessibilityEffect.GetInAccessibleTree(Element);
}
}
public TodoListPage()
{
Title = "Todo";
listView = new ListView {
StyleId = "TodoList"
};
listView.ItemTemplate = new DataTemplate(typeof(TodoItemCell));
listView.ItemSelected += async(sender, e) => {
if (e.SelectedItem == null)
{
return; // ensures we ignore this handler when the selection is just being cleared
}
var todoItem = (TodoItem)e.SelectedItem;
var todoPage = new TodoItemPage();
todoPage.BindingContext = todoItem;
await Navigation.PushAsync(todoPage);
((ListView)sender).SelectedItem = null; // clears the 'selected' background
};
// make floating (+) image at bottom of screen
var tap = new TapGestureRecognizer(async(View obj) => {
var todoItem = new TodoItem();
var todoPage = new TodoItemPage();
todoPage.BindingContext = todoItem;
var b = newImage.Bounds;
b.Y = b.Y - 50;
await newImage.LayoutTo(b, 250, Easing.SinIn);
b.Y = b.Y + 50;
await newImage.LayoutTo(b, 250, Easing.SinOut);
await Navigation.PushAsync(todoPage);
});
newImage = new Image {
Source = "newitem.png",
WidthRequest = 40,
Opacity = 0.8f,
StyleId = "TodoAdd"
};
newImage.GestureRecognizers.Add(tap);
AccessibilityEffect.SetAccessibilityTraits(newImage, AccessibilityTrait.Button);
AccessibilityEffect.SetAccessibilityLabel(newImage, "Add new item");
layout = new RelativeLayout();
layout.Children.Add(listView,
xConstraint: Constraint.Constant(0),
yConstraint: Constraint.Constant(0),
widthConstraint: Constraint.RelativeToParent((parent) => { return(parent.Width); }),
heightConstraint: Constraint.RelativeToParent((parent) => { return(parent.Height); }));
layout.Children.Add(newImage,
xConstraint: Constraint.RelativeToParent((parent) =>
{
return((parent.Width / 2) - 20); // center of image (which is 40 wide)
}),
yConstraint: Constraint.RelativeToParent((parent) =>
{
return(parent.Height - 60);
}));
Content = layout;
#region toolbar
var tbiAdd = new ToolbarItem("+", "plus.png", () => {
var todoItem = new TodoItem();
var todoPage = new TodoItemPage();
todoPage.BindingContext = todoItem;
Navigation.PushAsync(todoPage);
}, 0, 0);
tbiAdd.StyleId = "ToolbarAdd";
//tbiAdd.Order = ToolbarItemOrder.Secondary;
ToolbarItems.Add(tbiAdd);
var tbiSpeak = new ToolbarItem("?", "chat.png", () => {
var todos = App.Database.GetItemsNotDone();
var tospeak = "";
foreach (var t in todos)
{
tospeak += t.Name + " ";
}
if (tospeak == "")
{
tospeak = "there are no tasks to do";
}
DependencyService.Get <ITextToSpeech>().Speak("Hello from Xamarin Forms");
}, 0, 0);
tbiSpeak.StyleId = "ToolbarSpeak";
// demonstrate toolbar/optionmenu
//tbiSpeak.Order = ToolbarItemOrder.Secondary;
ToolbarItems.Add(tbiSpeak);
#endregion
}
public TodoItemPage()
{
this.SetBinding(ContentPage.TitleProperty, "Name");
NavigationPage.SetHasNavigationBar(this, true);
var nameLabel = new Label {
Text = "Name"
};
var nameEntry = new Entry {
StyleId = "TodoName", Placeholder = "Todo action"
};
nameEntry.SetBinding(Entry.TextProperty, "Name");
var notesLabel = new Label {
Text = "Notes"
};
var notesEntry = new Entry {
StyleId = "TodoNotes", Placeholder = "More info"
};
notesEntry.SetBinding(Entry.TextProperty, "Notes");
var doneLabel = new Label {
Text = "Done"
};
var doneEntry = new Switch {
StyleId = "TodoDone"
};
doneEntry.SetBinding(Switch.IsToggledProperty, "Done");
AccessibilityEffect.SetInAccessibleTree(nameLabel, false);
AccessibilityEffect.SetAccessibilityHint(nameEntry, "Todo name");
AccessibilityEffect.SetInAccessibleTree(notesLabel, false);
AccessibilityEffect.SetAccessibilityHint(notesEntry, "Additional notes");
AccessibilityEffect.SetInAccessibleTree(doneLabel, false);
AccessibilityEffect.SetAccessibilityLabel(doneEntry, "whether todo item is done");
var saveButton = new Button {
Text = "Save",
BackgroundColor = Color.Green,
BorderRadius = 0,
TextColor = Color.White,
StyleId = "TodoSave"
};
saveButton.Clicked += (sender, e) => {
var todoItem = (TodoItem)BindingContext;
App.Database.SaveItem(todoItem);
this.Navigation.PopAsync();
};
var deleteButton = new Button {
Text = "Delete",
BackgroundColor = Color.Red,
BorderRadius = 0,
TextColor = Color.White,
StyleId = "TodoDelete"
};
deleteButton.Clicked += (sender, e) => {
var todoItem = (TodoItem)BindingContext;
App.Database.DeleteItem(todoItem.ID);
this.Navigation.PopAsync();
};
var cancelButton = new Button {
Text = "Cancel",
BackgroundColor = Color.Gray,
BorderRadius = 0,
TextColor = Color.White,
StyleId = "TodoCancel"
};
cancelButton.Clicked += (sender, e) => {
var todoItem = (TodoItem)BindingContext;
this.Navigation.PopAsync();
};
var speakButton = new Button {
Text = "Speak", StyleId = "TodoSpeak"
};
speakButton.Clicked += (sender, e) => {
var todoItem = (TodoItem)BindingContext;
DependencyService.Get <ITextToSpeech>().Speak(todoItem.Name + " " + todoItem.Notes);
};
Content = new StackLayout {
VerticalOptions = LayoutOptions.StartAndExpand,
Padding = new Thickness(20),
Children =
{
nameLabel, nameEntry,
notesLabel, notesEntry,
doneLabel, doneEntry,
saveButton, deleteButton,cancelButton,
speakButton
}
};
}
