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using System;
using System.Linq;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading;
using Xamarin.Forms.CustomAttributes;
namespace Xamarin.Forms.Controls
{
internal class CoreGalleryPage<T> : ContentPage
where T : View, new ()
{
List<View> _views;
int _currentIndex;
Picker _picker;
StackLayout _moveNextStack;
ViewContainer<T> _backgroundColorViewContainer;
ViewContainer<T> _opacityViewContainer;
ViewContainer<T> _rotationViewContainer;
ViewContainer<T> _rotationXViewContainer;
ViewContainer<T> _rotationYViewContainer;
ViewContainer<T> _scaleViewContainer;
ViewContainer<T> _translationXViewContainer;
ViewContainer<T> _translationYViewContainer;
StateViewContainer<T> _focusStateViewContainer;
StateViewContainer<T> _isFocusedStateViewContainer;
StateViewContainer<T> _isVisibleStateViewContainer;
EventViewContainer<T> _gestureRecognizerEventViewContainer;
EventViewContainer<T> _focusedEventViewContainer;
EventViewContainer<T> _unfocusedEventViewContainer;
LayeredViewContainer<T> _inputTransparentViewContainer;
protected StateViewContainer<T> IsEnabledStateViewContainer { get; private set; }
protected StackLayout Layout { get; private set; }
internal CoreGalleryPage ()
{
Layout = new StackLayout {
Padding = new Thickness (20)
};
var modalDismissButton = new Button () {
Text = "Dismiss Page",
Command = new Command (async () => await Navigation.PopModalAsync ())
};
Layout.Children.Add (modalDismissButton);
Build (Layout);
Content = new ScrollView { AutomationId = "GalleryScrollView", Content = Layout };
}
protected virtual void InitializeElement (T element) {}
protected virtual void Build (StackLayout stackLayout)
{
var isFocusedView = new T ();
isFocusedView.SetValueCore (IsFocusedPropertyKey, true);
var viewContainers = new[] {
_isFocusedStateViewContainer = new StateViewContainer<T> (Test.VisualElement.IsFocused, isFocusedView),
_backgroundColorViewContainer = new ViewContainer<T> (Test.VisualElement.BackgroundColor, new T { BackgroundColor = Color.Blue }),
_focusStateViewContainer = new StateViewContainer<T> (Test.VisualElement.Focus, new T ()),
_gestureRecognizerEventViewContainer = new EventViewContainer<T> (Test.View.GestureRecognizers, new T ()),
_inputTransparentViewContainer = new LayeredViewContainer<T> (Test.VisualElement.InputTransparent, new T { InputTransparent = true }),
IsEnabledStateViewContainer = new StateViewContainer<T> (Test.VisualElement.IsEnabled, new T { IsEnabled = true }),
_focusedEventViewContainer = new EventViewContainer<T> (Test.VisualElement.Focused, new T ()),
_unfocusedEventViewContainer = new EventViewContainer<T> (Test.VisualElement.Unfocused, new T ()),
_isVisibleStateViewContainer = new StateViewContainer<T> (Test.VisualElement.IsVisible, new T { IsVisible = true }),
_opacityViewContainer = new ViewContainer<T> (Test.VisualElement.Opacity, new T { Opacity = 0.5 }),
_rotationViewContainer = new ViewContainer<T> (Test.VisualElement.Rotation, new T { Rotation = 10 }),
_rotationXViewContainer = new ViewContainer<T> (Test.VisualElement.RotationX, new T { RotationX = 33 }),
_rotationYViewContainer = new ViewContainer<T> (Test.VisualElement.RotationY, new T { RotationY = 10 }),
_scaleViewContainer = new ViewContainer<T> (Test.VisualElement.Scale, new T { Scale = 0.5 }),
_translationXViewContainer = new ViewContainer<T> (Test.VisualElement.TranslationX, new T { TranslationX = 30 }),
_translationYViewContainer = new ViewContainer<T> (Test.VisualElement.TranslationY, new T { TranslationY = 30 }),
};
// Set state
IsEnabledStateViewContainer.StateChangeButton.Command = new Command (() => {
IsEnabledStateViewContainer.View.IsEnabled = !IsEnabledStateViewContainer.View.IsEnabled;
});
_isVisibleStateViewContainer.StateChangeButton.Command = new Command (() => {
_isVisibleStateViewContainer.View.IsVisible = !_isVisibleStateViewContainer.View.IsVisible;
});
_focusStateViewContainer.StateChangeButton.Command = new Command (() => {
if (_focusStateViewContainer.View.IsFocused) {
_focusStateViewContainer.View.Unfocus ();
} else {
_focusStateViewContainer.View.Focus ();
}
});
_focusedEventViewContainer.View.Focused += (sender, args) => _focusedEventViewContainer.EventFired ();
_unfocusedEventViewContainer.View.Unfocused += (sender, args) => _unfocusedEventViewContainer.EventFired ();
_gestureRecognizerEventViewContainer.View.GestureRecognizers.Add (
new TapGestureRecognizer {
Command = new Command (() => _gestureRecognizerEventViewContainer.EventFired ())
}
);
_views = new List<View> (viewContainers.Select (o => o.ContainerLayout));
_moveNextStack = new StackLayout ();
var moveNextButton = new Button ();
moveNextButton.Text = "Move Next";
moveNextButton.AutomationId = "MoveNextButton";
moveNextButton.Clicked += delegate (object sender, EventArgs e) {
if (!_views.Any ())
return;
if (_currentIndex + 1 >= _views.Count) {
return;
}
_currentIndex += 1;
_moveNextStack.Children.RemoveAt (2);
_moveNextStack.Children.Add (_views[_currentIndex]);
_picker.SelectedIndexChanged -= PickerSelectedIndexChanged;
_picker.SelectedIndex = _currentIndex;
_picker.SelectedIndexChanged += PickerSelectedIndexChanged;
};
_picker = new Picker();
foreach (var container in viewContainers) {
_picker.Items.Add(container.TitleLabel.Text);
}
_picker.SelectedIndex = _currentIndex;
_picker.SelectedIndexChanged += PickerSelectedIndexChanged;
_moveNextStack.Children.Add (_picker);
_moveNextStack.Children.Add (moveNextButton);
_moveNextStack.Children.Add (_views[_currentIndex]);
stackLayout.Children.Add (_moveNextStack);
if (!SupportsFocus) {
stackLayout.Children.Remove (_focusStateViewContainer.ContainerLayout);
stackLayout.Children.Remove (_isFocusedStateViewContainer.ContainerLayout);
}
if (!SupportsTapGestureRecognizer)
stackLayout.Children.Remove (_gestureRecognizerEventViewContainer.ContainerLayout);
foreach (var element in viewContainers)
InitializeElement (element.View);
}
void PickerSelectedIndexChanged (object sender, EventArgs eventArgs)
{
_currentIndex = _picker.SelectedIndex;
_moveNextStack.Children.RemoveAt (2);
_moveNextStack.Children.Add (_views[_currentIndex]);
}
protected virtual bool SupportsTapGestureRecognizer
{
get { return true; }
}
protected virtual bool SupportsFocus
{
get { return true; }
}
protected void Add (ViewContainer<T> view) {
_views.Add (view.ContainerLayout);
_picker.Items.Add(view.TitleLabel.Text);
}
}
}
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