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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
internal class AbsolutePositioningExplorationViewModel : INotifyPropertyChanged
{
double _rectangleX = 0.5;
double _rectangleY = 0.5;
double _rectangleWidth = 0.5;
double _rectangleHeight = 0.5;
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged ([CallerMemberName] string propertyName = null)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler (this, new PropertyChangedEventArgs (propertyName));
}
public double RectangleX
{
get { return _rectangleX; }
set
{
if (_rectangleX == value)
return;
_rectangleX = value;
OnPropertyChanged ();
OnPropertyChanged ("Rectangle");
}
}
public double RectangleY
{
get { return _rectangleY; }
set
{
if (_rectangleY == value)
return;
_rectangleY = value;
OnPropertyChanged ();
OnPropertyChanged ("Rectangle");
}
}
public double RectangleWidth
{
get { return _rectangleWidth; }
set
{
if (_rectangleWidth == value)
return;
_rectangleWidth = value;
OnPropertyChanged ();
OnPropertyChanged ("Rectangle");
}
}
public double RectangleHeight
{
get { return _rectangleHeight; }
set
{
if (_rectangleHeight == value)
return;
_rectangleHeight = value;
OnPropertyChanged ();
OnPropertyChanged ("Rectangle");
}
}
public Rectangle Rectangle
{
get { return new Rectangle(RectangleX, RectangleY, RectangleWidth, RectangleHeight); }
}
}
public class AbsoluteLayoutGallery : ContentPage
{
public AbsoluteLayoutGallery ()
{
if (Device.RuntimePlatform == Device.iOS && Device.Idiom == TargetIdiom.Tablet)
Padding = new Thickness(0, 0, 0, 60);
BindingContext = new AbsolutePositioningExplorationViewModel ();
var absLayout = new AbsoluteLayout {
BackgroundColor = Color.Gray,
VerticalOptions = LayoutOptions.FillAndExpand
};
var rect = new BoxView {Color = Color.Lime};
var xSlider = new Slider ();
var ySlider = new Slider ();
var widthSlider = new Slider ();
var heightSlider = new Slider ();
var grid = new Grid {
Padding = 10,
RowSpacing = 0,
ColumnDefinitions = {
new ColumnDefinition {Width = GridLength.Auto},
new ColumnDefinition {Width = new GridLength (1, GridUnitType.Star)}
}
};
grid.Children.Add (new Label {Text = "X:", VerticalTextAlignment = TextAlignment.Center}, 0, 0);
grid.Children.Add (xSlider, 1, 0);
grid.Children.Add (new Label {Text = "Y:", VerticalTextAlignment = TextAlignment.Center}, 0, 1);
grid.Children.Add (ySlider, 1, 1);
grid.Children.Add (new Label {Text = "Width:", VerticalTextAlignment = TextAlignment.Center}, 0, 2);
grid.Children.Add (widthSlider, 1, 2);
grid.Children.Add (new Label {Text = "Height:", VerticalTextAlignment = TextAlignment.Center}, 0, 3);
grid.Children.Add (heightSlider, 1, 3);
absLayout.Children.Add (rect);
var mainLayout = new StackLayout {
Spacing = 0,
Children = {
absLayout,
grid
}
};
rect.SetBinding (AbsoluteLayout.LayoutBoundsProperty, "Rectangle");
AbsoluteLayout.SetLayoutFlags (rect, AbsoluteLayoutFlags.All);
xSlider.SetBinding (Slider.ValueProperty, new Binding ("RectangleX", BindingMode.TwoWay));
ySlider.SetBinding (Slider.ValueProperty, new Binding ("RectangleY", BindingMode.TwoWay));
widthSlider.SetBinding (Slider.ValueProperty, new Binding ("RectangleWidth", BindingMode.TwoWay));
heightSlider.SetBinding (Slider.ValueProperty, new Binding ("RectangleHeight", BindingMode.TwoWay));
//Content = new ScrollView {Content = mainLayout};
Content = mainLayout;
}
}
}
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