2018-02-06 13:54:33 +03:00
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using System;
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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using Xamarin.Forms.Internals;
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namespace Xamarin.Forms
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{
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public class FlexLayout : Layout<View>
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{
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public static readonly BindableProperty DirectionProperty =
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BindableProperty.Create(nameof(Direction), typeof(FlexDirection), typeof(FlexLayout), FlexDirection.Row,
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propertyChanged: OnDirectionPropertyChanged);
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public static readonly BindableProperty JustifyContentProperty =
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BindableProperty.Create(nameof(JustifyContent), typeof(FlexJustify), typeof(FlexLayout), FlexJustify.Start,
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propertyChanged: OnJustifyContentPropertyChanged);
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public static readonly BindableProperty AlignContentProperty =
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BindableProperty.Create(nameof(AlignContent), typeof(FlexAlignContent), typeof(FlexLayout), FlexAlignContent.Stretch,
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propertyChanged: OnAlignContentPropertyChanged);
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public static readonly BindableProperty AlignItemsProperty =
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BindableProperty.Create(nameof(AlignItems), typeof(FlexAlignItems), typeof(FlexLayout), FlexAlignItems.Stretch,
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propertyChanged: OnAlignItemsPropertyChanged);
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public static readonly BindableProperty PositionProperty =
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BindableProperty.Create(nameof(Position), typeof(FlexPosition), typeof(FlexLayout), FlexPosition.Relative,
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propertyChanged: OnPositionPropertyChanged);
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public static readonly BindableProperty WrapProperty =
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BindableProperty.Create(nameof(Wrap), typeof(FlexWrap), typeof(FlexLayout), FlexWrap.NoWrap,
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propertyChanged: OnWrapPropertyChanged);
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static readonly BindableProperty FlexItemProperty =
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BindableProperty.CreateAttached("FlexItem", typeof(Flex.Item), typeof(FlexLayout), null);
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public static readonly BindableProperty OrderProperty =
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BindableProperty.CreateAttached("Order", typeof(int), typeof(FlexLayout), default(int),
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propertyChanged: OnOrderPropertyChanged);
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public static readonly BindableProperty GrowProperty =
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BindableProperty.CreateAttached("Grow", typeof(float), typeof(FlexLayout), default(float),
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propertyChanged: OnGrowPropertyChanged, validateValue: (bindable, value) => (float)value >= 0);
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public static readonly BindableProperty ShrinkProperty =
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BindableProperty.CreateAttached("Shrink", typeof(float), typeof(FlexLayout), 1f,
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propertyChanged: OnShrinkPropertyChanged, validateValue: (bindable, value) => (float)value >= 0);
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public static readonly BindableProperty AlignSelfProperty =
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BindableProperty.CreateAttached("AlignSelf", typeof(FlexAlignSelf), typeof(FlexLayout), FlexAlignSelf.Auto,
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propertyChanged: OnAlignSelfPropertyChanged);
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public static readonly BindableProperty BasisProperty =
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BindableProperty.CreateAttached("Basis", typeof(FlexBasis), typeof(FlexLayout), FlexBasis.Auto,
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propertyChanged: OnBasisPropertyChanged);
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public FlexDirection Direction {
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get => (FlexDirection)GetValue(DirectionProperty);
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set => SetValue(DirectionProperty, value);
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}
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public FlexJustify JustifyContent {
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get => (FlexJustify)GetValue(JustifyContentProperty);
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set => SetValue(JustifyContentProperty, value);
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}
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public FlexAlignContent AlignContent {
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get => (FlexAlignContent)GetValue(AlignContentProperty);
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set => SetValue(AlignContentProperty, value);
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}
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public FlexAlignItems AlignItems {
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get => (FlexAlignItems)GetValue(AlignItemsProperty);
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set => SetValue(AlignItemsProperty, value);
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}
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public FlexPosition Position {
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get => (FlexPosition)GetValue(PositionProperty);
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set => SetValue(PositionProperty, value);
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}
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public FlexWrap Wrap {
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get => (FlexWrap)GetValue(WrapProperty);
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set => SetValue(WrapProperty, value);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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static Flex.Item GetFlexItem(BindableObject bindable)
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=> (Flex.Item)bindable.GetValue(FlexItemProperty);
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static void SetFlexItem(BindableObject bindable, Flex.Item node)
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=> bindable.SetValue(FlexItemProperty, node);
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public static int GetOrder(BindableObject bindable)
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=> (int)bindable.GetValue(OrderProperty);
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public static void SetOrder(BindableObject bindable, int value)
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=> bindable.SetValue(OrderProperty, value);
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public static float GetGrow(BindableObject bindable)
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=> (float)bindable.GetValue(GrowProperty);
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public static void SetGrow(BindableObject bindable, float value)
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=> bindable.SetValue(GrowProperty, value);
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public static float GetShrink(BindableObject bindable)
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=> (float)bindable.GetValue(ShrinkProperty);
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public static void SetShrink(BindableObject bindable, float value)
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=> bindable.SetValue(ShrinkProperty, value);
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public static FlexAlignSelf GetAlignSelf(BindableObject bindable)
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=> (FlexAlignSelf)bindable.GetValue(AlignSelfProperty);
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public static void SetAlignSelf(BindableObject bindable, FlexAlignSelf value)
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=> bindable.SetValue(AlignSelfProperty, value);
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public static FlexBasis GetBasis(BindableObject bindable)
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=> (FlexBasis)bindable.GetValue(BasisProperty);
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public static void SetBasis(BindableObject bindable, FlexBasis value)
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=> bindable.SetValue(BasisProperty, value);
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static void OnOrderPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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2018-02-16 13:22:10 +03:00
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if (!bindable.IsSet(FlexItemProperty))
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2018-02-06 13:54:33 +03:00
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return;
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GetFlexItem(bindable).Order = (int)newValue;
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}
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static void OnGrowPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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2018-02-16 13:22:10 +03:00
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if (!bindable.IsSet(FlexItemProperty))
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2018-02-06 13:54:33 +03:00
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return;
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GetFlexItem(bindable).Grow = (float)newValue;
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}
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static void OnShrinkPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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2018-02-16 13:22:10 +03:00
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if (!bindable.IsSet(FlexItemProperty))
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2018-02-06 13:54:33 +03:00
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return;
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GetFlexItem(bindable).Shrink = (float)newValue;
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}
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static void OnAlignSelfPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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2018-02-16 13:22:10 +03:00
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if (!bindable.IsSet(FlexItemProperty))
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2018-02-06 13:54:33 +03:00
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return;
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GetFlexItem(bindable).AlignSelf = (Flex.AlignSelf)(FlexAlignSelf)newValue;
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}
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static void OnBasisPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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2018-02-16 13:22:10 +03:00
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if (!bindable.IsSet(FlexItemProperty))
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2018-02-06 13:54:33 +03:00
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return;
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GetFlexItem(bindable).Basis = ((FlexBasis)newValue).ToFlexBasis();
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}
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static void OnDirectionPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = bindable as FlexLayout;
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if (flexLayout._root == null)
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return;
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flexLayout._root.Direction = (Flex.Direction)(FlexDirection)newValue;
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flexLayout.InvalidateLayout();
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}
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static void OnJustifyContentPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = bindable as FlexLayout;
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if (flexLayout._root == null)
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return;
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flexLayout._root.JustifyContent = (Flex.Justify)(FlexJustify)newValue;
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flexLayout.InvalidateLayout();
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}
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static void OnAlignContentPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = bindable as FlexLayout;
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if (flexLayout._root == null)
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return;
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flexLayout._root.AlignContent = (Flex.AlignContent)(FlexAlignContent)newValue;
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flexLayout.InvalidateLayout();
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}
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static void OnAlignItemsPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = (FlexLayout)bindable;
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if (flexLayout._root == null)
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return;
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flexLayout._root.AlignItems = (Flex.AlignItems)(FlexAlignItems)newValue;
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flexLayout.InvalidateLayout();
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}
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static void OnPositionPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = (FlexLayout)bindable;
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if (flexLayout._root == null)
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return;
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flexLayout._root.Position = (Flex.Position)(FlexPosition)newValue;
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flexLayout.InvalidateLayout();
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}
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static void OnWrapPropertyChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var flexLayout = bindable as FlexLayout;
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if (flexLayout._root == null)
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return;
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flexLayout._root.Wrap = (Flex.Wrap)(FlexWrap)newValue;
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flexLayout.InvalidateLayout();
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}
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Flex.Item _root;
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//this should only be used in unitTests. layout creation will normally happen on OnParentSet
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internal override void OnIsPlatformEnabledChanged()
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{
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base.OnIsPlatformEnabledChanged();
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if (IsPlatformEnabled && _root == null)
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PopulateLayout();
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else if(!IsPlatformEnabled && _root != null)
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ClearLayout();
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}
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protected override void OnParentSet()
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{
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base.OnParentSet();
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if (Parent != null && _root == null)
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PopulateLayout();
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else if (Parent == null && _root != null)
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ClearLayout();
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}
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void PopulateLayout()
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{
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InitLayoutProperties(_root = new Flex.Item());
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foreach (var child in Children)
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AddChild(child);
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}
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void InitLayoutProperties(Flex.Item item)
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{
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var values = GetValues(AlignContentProperty,
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AlignItemsProperty,
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DirectionProperty,
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JustifyContentProperty,
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WrapProperty);
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item.AlignContent = (Flex.AlignContent)(FlexAlignContent)values[0];
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item.AlignItems = (Flex.AlignItems)(FlexAlignItems)values[1];
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item.Direction = (Flex.Direction)(FlexDirection)values[2];
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item.JustifyContent = (Flex.Justify)(FlexJustify)values[3];
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item.Wrap = (Flex.Wrap)(FlexWrap)values[4];
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}
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void ClearLayout()
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{
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foreach (var child in Children)
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RemoveChild(child);
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_root = null;
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}
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protected override void OnAdded(View view)
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{
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AddChild(view);
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view.PropertyChanged += OnChildPropertyChanged;
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base.OnAdded(view);
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}
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protected override void OnRemoved(View view)
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{
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view.PropertyChanged -= OnChildPropertyChanged;
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RemoveChild(view);
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base.OnRemoved(view);
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}
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void AddChild(View view)
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{
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if (_root == null)
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return;
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var item = (view as FlexLayout)?._root ?? new Flex.Item();
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InitItemProperties(view, item);
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if (!(view is FlexLayout)) { //inner layouts don't get measured
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item.SelfSizing = (Flex.Item it, ref float w, ref float h) => {
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2018-02-08 21:18:56 +03:00
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var sizeConstrains = item.GetConstraints();
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2018-03-06 12:50:07 +03:00
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sizeConstrains.Width = (_measuring && sizeConstrains.Width == 0) ? double.PositiveInfinity : sizeConstrains.Width;
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sizeConstrains.Height = (_measuring && sizeConstrains.Height == 0) ? double.PositiveInfinity : sizeConstrains.Height;
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2018-02-08 21:18:56 +03:00
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var request = view.Measure(sizeConstrains.Width, sizeConstrains.Height).Request;
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2018-02-06 13:54:33 +03:00
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w = (float)request.Width;
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h = (float)request.Height;
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};
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}
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2018-03-06 12:50:07 +03:00
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_root.InsertAt(Children.IndexOf(view), item);
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2018-02-06 13:54:33 +03:00
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SetFlexItem(view, item);
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}
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void InitItemProperties(View view, Flex.Item item)
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{
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var values = view.GetValues(OrderProperty,
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GrowProperty,
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ShrinkProperty,
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BasisProperty,
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AlignSelfProperty,
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MarginProperty,
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WidthRequestProperty,
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HeightRequestProperty);
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item.Order = (int)values[0];
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item.Grow = (float)values[1];
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item.Shrink = (float)values[2];
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item.Basis = ((FlexBasis)values[3]).ToFlexBasis();
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item.AlignSelf = (Flex.AlignSelf)(FlexAlignSelf)values[4];
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item.MarginLeft = (float)((Thickness)values[5]).Left;
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item.MarginTop = (float)((Thickness)values[5]).Top;
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item.MarginRight = (float)((Thickness)values[5]).Right;
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item.MarginBottom = (float)((Thickness)values[5]).Bottom;
|
|
|
|
|
item.Width = (double)values[6] < 0 ? float.NaN : (float)(double)values[6];
|
|
|
|
|
item.Height = (double)values[7] < 0 ? float.NaN : (float)(double)values[7];
|
|
|
|
|
if (view is FlexLayout) {
|
|
|
|
|
var padding = view.GetValue(PaddingProperty);
|
|
|
|
|
item.PaddingLeft = (float)((Thickness)padding).Left;
|
|
|
|
|
item.PaddingTop = (float)((Thickness)padding).Top;
|
|
|
|
|
item.PaddingRight = (float)((Thickness)padding).Right;
|
|
|
|
|
item.PaddingBottom = (float)((Thickness)padding).Bottom;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void RemoveChild(View view)
|
|
|
|
|
{
|
|
|
|
|
if (_root == null)
|
|
|
|
|
return;
|
|
|
|
|
var item = GetFlexItem(view);
|
|
|
|
|
_root.Remove(item);
|
|
|
|
|
view.ClearValue(FlexItemProperty);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void OnChildPropertyChanged(object sender, PropertyChangedEventArgs e)
|
|
|
|
|
{
|
|
|
|
|
if ( e.PropertyName == WidthRequestProperty.PropertyName
|
|
|
|
|
|| e.PropertyName == HeightRequestProperty.PropertyName) {
|
|
|
|
|
var item = (sender as FlexLayout)?._root ?? GetFlexItem((BindableObject)sender);
|
|
|
|
|
item.Width = ((View)sender).WidthRequest < 0 ? float.NaN : (float)((View)sender).WidthRequest;
|
|
|
|
|
item.Height = ((View)sender).HeightRequest < 0 ? float.NaN : (float)((View)sender).HeightRequest;
|
|
|
|
|
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
|
|
|
|
|
UpdateChildrenLayout();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (e.PropertyName == MarginProperty.PropertyName) {
|
|
|
|
|
var item = (sender as FlexLayout)?._root ?? GetFlexItem((BindableObject)sender);
|
2018-03-06 12:50:07 +03:00
|
|
|
|
if (item == null)
|
|
|
|
|
return;
|
2018-02-06 13:54:33 +03:00
|
|
|
|
var margin = (Thickness)((View)sender).GetValue(MarginProperty);
|
|
|
|
|
item.MarginLeft = (float)margin.Left;
|
|
|
|
|
item.MarginTop = (float)margin.Top;
|
|
|
|
|
item.MarginRight = (float)margin.Right;
|
|
|
|
|
item.MarginBottom = (float)margin.Bottom;
|
|
|
|
|
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
|
|
|
|
|
UpdateChildrenLayout();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (e.PropertyName == PaddingProperty.PropertyName) {
|
|
|
|
|
var item = (sender as FlexLayout)?._root ?? GetFlexItem((BindableObject)sender);
|
2018-03-06 12:50:07 +03:00
|
|
|
|
if (item == null)
|
|
|
|
|
return;
|
2018-02-06 13:54:33 +03:00
|
|
|
|
var padding = (Thickness)((View)sender).GetValue(PaddingProperty);
|
|
|
|
|
item.PaddingLeft = (float)padding.Left;
|
|
|
|
|
item.PaddingTop = (float)padding.Top;
|
|
|
|
|
item.PaddingRight = (float)padding.Right;
|
|
|
|
|
item.PaddingBottom = (float)padding.Bottom;
|
|
|
|
|
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
|
|
|
|
|
UpdateChildrenLayout();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if ( e.PropertyName == OrderProperty.PropertyName
|
|
|
|
|
|| e.PropertyName == GrowProperty.PropertyName
|
|
|
|
|
|| e.PropertyName == ShrinkProperty.PropertyName
|
|
|
|
|
|| e.PropertyName == BasisProperty.PropertyName
|
|
|
|
|
|| e.PropertyName == AlignSelfProperty.PropertyName) {
|
|
|
|
|
InvalidateMeasureInternal(InvalidationTrigger.MeasureChanged);
|
|
|
|
|
UpdateChildrenLayout();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
protected override void LayoutChildren(double x, double y, double width, double height)
|
|
|
|
|
{
|
|
|
|
|
Layout(x, y, width, height);
|
|
|
|
|
foreach (var child in Children) {
|
|
|
|
|
var frame = GetFlexItem(child).GetFrame();
|
|
|
|
|
if (double.IsNaN(frame.X)
|
|
|
|
|
|| double.IsNaN(frame.Y)
|
|
|
|
|
|| double.IsNaN(frame.Width)
|
|
|
|
|
|| double.IsNaN(frame.Height))
|
|
|
|
|
throw new Exception("something is deeply wrong");
|
|
|
|
|
child.Layout(GetFlexItem(child).GetFrame());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2018-03-06 12:50:07 +03:00
|
|
|
|
bool _measuring;
|
2018-02-06 13:54:33 +03:00
|
|
|
|
protected override SizeRequest OnMeasure(double widthConstraint, double heightConstraint)
|
|
|
|
|
{
|
|
|
|
|
//All of this is a HACK as X.Flex doesn't supports measuring
|
|
|
|
|
if (!double.IsPositiveInfinity(widthConstraint) && !double.IsPositiveInfinity(heightConstraint))
|
|
|
|
|
return new SizeRequest(new Size(widthConstraint, heightConstraint));
|
|
|
|
|
|
2018-03-06 12:50:07 +03:00
|
|
|
|
_measuring = true;
|
2018-02-06 13:54:33 +03:00
|
|
|
|
//1. Set Shrink to 0, set align-self to start (to avoid stretching)
|
2018-03-06 12:50:07 +03:00
|
|
|
|
// Set Image.Aspect to Fill to get the value we expect in measuring
|
|
|
|
|
foreach (var child in Children) {
|
|
|
|
|
var item = GetFlexItem(child);
|
2018-02-06 13:54:33 +03:00
|
|
|
|
item.Shrink = 0;
|
|
|
|
|
item.AlignSelf = Flex.AlignSelf.Start;
|
|
|
|
|
}
|
|
|
|
|
Layout(0, 0, widthConstraint, heightConstraint);
|
|
|
|
|
|
|
|
|
|
//2. look at the children location
|
|
|
|
|
if (double.IsPositiveInfinity(widthConstraint)) {
|
|
|
|
|
widthConstraint = 0;
|
|
|
|
|
foreach (var item in _root)
|
2018-03-02 11:13:51 +03:00
|
|
|
|
widthConstraint = Math.Max(widthConstraint, item.Frame[0] + item.Frame[2] + item.MarginRight);
|
2018-02-06 13:54:33 +03:00
|
|
|
|
}
|
|
|
|
|
if (double.IsPositiveInfinity(heightConstraint)) {
|
|
|
|
|
heightConstraint = 0;
|
|
|
|
|
foreach (var item in _root)
|
2018-03-02 11:13:51 +03:00
|
|
|
|
heightConstraint = Math.Max(heightConstraint, item.Frame[1] + item.Frame[3] + item.MarginBottom);
|
2018-02-06 13:54:33 +03:00
|
|
|
|
}
|
|
|
|
|
|
2018-03-06 12:50:07 +03:00
|
|
|
|
//3. reset Shrink, algin-self, and image.aspect
|
2018-02-06 13:54:33 +03:00
|
|
|
|
foreach (var child in Children) {
|
2018-03-06 12:50:07 +03:00
|
|
|
|
var item = GetFlexItem(child);
|
|
|
|
|
item.Shrink = (float)child.GetValue(ShrinkProperty);
|
|
|
|
|
item.AlignSelf = (Flex.AlignSelf)(FlexAlignSelf)child.GetValue(AlignSelfProperty);
|
2018-02-06 13:54:33 +03:00
|
|
|
|
}
|
2018-03-06 12:50:07 +03:00
|
|
|
|
_measuring = false;
|
2018-02-06 13:54:33 +03:00
|
|
|
|
return new SizeRequest(new Size(widthConstraint, heightConstraint));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void Layout(double x, double y, double width, double height)
|
|
|
|
|
{
|
|
|
|
|
if (_root.Parent != null) //Layout is only computed at root level
|
|
|
|
|
return;
|
|
|
|
|
_root.Left = (float)x;
|
|
|
|
|
_root.Top = (float)y;
|
|
|
|
|
_root.Width = !double.IsPositiveInfinity((width)) ? (float)width : 0;
|
|
|
|
|
_root.Height = !double.IsPositiveInfinity((height)) ? (float)height : 0;
|
|
|
|
|
_root.Layout();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static class FlexExtensions
|
|
|
|
|
{
|
|
|
|
|
public static int IndexOf(this Flex.Item parent, Flex.Item child)
|
|
|
|
|
{
|
|
|
|
|
var index = -1;
|
|
|
|
|
foreach (var it in parent) {
|
|
|
|
|
index++;
|
|
|
|
|
if (it == child)
|
|
|
|
|
return index;
|
|
|
|
|
}
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public static void Remove(this Flex.Item parent, Flex.Item child)
|
|
|
|
|
{
|
|
|
|
|
var index = parent.IndexOf(child);
|
|
|
|
|
if (index < 0)
|
|
|
|
|
return;
|
|
|
|
|
parent.RemoveAt((uint)index);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public static Rectangle GetFrame(this Flex.Item item)
|
|
|
|
|
{
|
|
|
|
|
return new Rectangle(item.Frame[0], item.Frame[1], item.Frame[2], item.Frame[3]);
|
|
|
|
|
}
|
|
|
|
|
|
2018-02-08 21:18:56 +03:00
|
|
|
|
public static Size GetConstraints(this Flex.Item item)
|
2018-02-06 13:54:33 +03:00
|
|
|
|
{
|
|
|
|
|
var widthConstraint = -1d;
|
|
|
|
|
var heightConstraint = -1d;
|
|
|
|
|
var parent = item.Parent;
|
2018-02-08 21:18:56 +03:00
|
|
|
|
do
|
|
|
|
|
{
|
2018-02-06 13:54:33 +03:00
|
|
|
|
if (parent == null)
|
|
|
|
|
break;
|
|
|
|
|
if (widthConstraint < 0 && !float.IsNaN(parent.Width))
|
|
|
|
|
widthConstraint = (double)parent.Width;
|
|
|
|
|
if (heightConstraint < 0 && !float.IsNaN(parent.Height))
|
|
|
|
|
heightConstraint = (double)parent.Height;
|
|
|
|
|
parent = parent.Parent;
|
|
|
|
|
} while (widthConstraint < 0 || heightConstraint < 0);
|
2018-02-08 21:18:56 +03:00
|
|
|
|
return new Size(widthConstraint, heightConstraint);
|
2018-02-06 13:54:33 +03:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public static Flex.Basis ToFlexBasis(this FlexBasis basis)
|
|
|
|
|
{
|
|
|
|
|
if (basis.IsAuto)
|
|
|
|
|
return Flex.Basis.Auto;
|
|
|
|
|
if (basis.IsRelative)
|
|
|
|
|
return new Flex.Basis(basis.Length, isRelative: true);
|
|
|
|
|
return new Flex.Basis(basis.Length, isRelative: false);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|