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implement IScrollSnapPointInfo in StackPanel

pull/9961/head
Emmanuel Hansen 4 years ago
parent
4390f197d4
commit
d102536017
1 changed files with 177 additions and 1 deletions
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  1. 178
      src/Avalonia.Controls/StackPanel.cs

178
src/Avalonia.Controls/StackPanel.cs
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@ -4,7 +4,11 @@
// Licensed to The Avalonia Project under MIT License, courtesy of The .NET Foundation.
using System;
using System.Collections.Generic;
using System.Linq;
using Avalonia.Controls.Primitives;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Layout;
namespace Avalonia.Controls
@ -12,7 +16,7 @@ namespace Avalonia.Controls
/// <summary>
/// A panel which lays out its children horizontally or vertically.
/// </summary>
public class StackPanel : Panel, INavigableContainer
public class StackPanel : Panel, INavigableContainer, IScrollSnapPointsInfo
{
/// <summary>
/// Defines the <see cref="Spacing"/> property.
@ -26,6 +30,34 @@ namespace Avalonia.Controls
public static readonly StyledProperty<Orientation> OrientationProperty =
StackLayout.OrientationProperty.AddOwner<StackPanel>();
/// <summary>
/// Defines the <see cref="AreHorizontalSnapPointsRegular"/> property.
/// </summary>
public static readonly StyledProperty<bool> AreHorizontalSnapPointsRegularProperty =
AvaloniaProperty.Register<StackPanel, bool>(nameof(AreHorizontalSnapPointsRegular));
/// <summary>
/// Defines the <see cref="AreVerticalSnapPointsRegular"/> property.
/// </summary>
public static readonly StyledProperty<bool> AreVerticalSnapPointsRegularProperty =
AvaloniaProperty.Register<StackPanel, bool>(nameof(AreVerticalSnapPointsRegular));
/// <summary>
/// Defines the <see cref="HorizontalSnapPointsChanged"/> event.
/// </summary>
public static readonly RoutedEvent<RoutedEventArgs> HorizontalSnapPointsChangedEvent =
RoutedEvent.Register<StackPanel, RoutedEventArgs>(
nameof(HorizontalSnapPointsChanged),
RoutingStrategies.Bubble);
/// <summary>
/// Defines the <see cref="VerticalSnapPointsChanged"/> event.
/// </summary>
public static readonly RoutedEvent<RoutedEventArgs> VerticalSnapPointsChangedEvent =
RoutedEvent.Register<StackPanel, RoutedEventArgs>(
nameof(VerticalSnapPointsChanged),
RoutingStrategies.Bubble);
/// <summary>
/// Initializes static members of the <see cref="StackPanel"/> class.
/// </summary>
@ -53,6 +85,31 @@ namespace Avalonia.Controls
set { SetValue(OrientationProperty, value); }
}
public event EventHandler<RoutedEventArgs>? HorizontalSnapPointsChanged
{
add => AddHandler(HorizontalSnapPointsChangedEvent, value);
remove => RemoveHandler(HorizontalSnapPointsChangedEvent, value);
}
public event EventHandler<RoutedEventArgs>? VerticalSnapPointsChanged
{
add => AddHandler(VerticalSnapPointsChangedEvent, value);
remove => RemoveHandler(VerticalSnapPointsChangedEvent, value);
}
public bool AreHorizontalSnapPointsRegular
{
get { return GetValue(AreHorizontalSnapPointsRegularProperty); }
set { SetValue(AreHorizontalSnapPointsRegularProperty, value); }
}
public bool AreVerticalSnapPointsRegular
{
get { return GetValue(AreVerticalSnapPointsRegularProperty); }
set { SetValue(AreVerticalSnapPointsRegularProperty, value); }
}
/// <summary>
/// Gets the next control in the specified direction.
/// </summary>
@ -274,6 +331,8 @@ namespace Avalonia.Controls
ArrangeChild(child, rcChild, finalSize, Orientation);
}
RaiseEvent(new RoutedEventArgs(Orientation == Orientation.Horizontal ? HorizontalSnapPointsChangedEvent : VerticalSnapPointsChangedEvent));
return finalSize;
}
@ -285,5 +344,122 @@ namespace Avalonia.Controls
{
child.Arrange(rect);
}
public IReadOnlyList<double> GetIrregularSnapPoints(Orientation orientation, SnapPointsAlignment snapPointsAlignment)
{
var snapPoints = new List<double>();
switch (orientation)
{
case Orientation.Horizontal:
if (AreHorizontalSnapPointsRegular)
throw new InvalidOperationException();
if (Orientation == Orientation.Horizontal)
{
foreach(var child in VisualChildren)
{
double snapPoint = 0;
switch (snapPointsAlignment)
{
case SnapPointsAlignment.Near:
snapPoint = child.Bounds.Left;
break;
case SnapPointsAlignment.Center:
snapPoint = child.Bounds.Center.X;
break;
case SnapPointsAlignment.Far:
snapPoint = child.Bounds.Right;
break;
}
snapPoints.Add(snapPoint);
}
}
break;
case Orientation.Vertical:
if (AreVerticalSnapPointsRegular)
throw new InvalidOperationException();
if (Orientation == Orientation.Vertical)
{
foreach (var child in VisualChildren)
{
double snapPoint = 0;
switch (snapPointsAlignment)
{
case SnapPointsAlignment.Near:
snapPoint = child.Bounds.Top;
break;
case SnapPointsAlignment.Center:
snapPoint = child.Bounds.Center.Y;
break;
case SnapPointsAlignment.Far:
snapPoint = child.Bounds.Bottom;
break;
}
snapPoints.Add(snapPoint);
}
}
break;
}
return snapPoints;
}
public double GetRegularSnapPoints(Orientation orientation, SnapPointsAlignment snapPointsAlignment, out double offset)
{
offset = 0f;
var firstChild = VisualChildren.FirstOrDefault();
if(firstChild == null)
{
return 0;
}
double snapPoint = 0;
switch (Orientation)
{
case Orientation.Horizontal:
if (!AreHorizontalSnapPointsRegular)
throw new InvalidOperationException();
snapPoint = firstChild.Bounds.Width;
switch (snapPointsAlignment)
{
case SnapPointsAlignment.Near:
offset = firstChild.Bounds.Left;
break;
case SnapPointsAlignment.Center:
offset = firstChild.Bounds.Center.X;
break;
case SnapPointsAlignment.Far:
offset = firstChild.Bounds.Right;
break;
}
break;
case Orientation.Vertical:
if (!AreVerticalSnapPointsRegular)
throw new InvalidOperationException();
snapPoint = firstChild.Bounds.Height;
switch (snapPointsAlignment)
{
case SnapPointsAlignment.Near:
offset = firstChild.Bounds.Top;
break;
case SnapPointsAlignment.Center:
offset = firstChild.Bounds.Center.Y;
break;
case SnapPointsAlignment.Far:
offset = firstChild.Bounds.Bottom;
break;
}
break;
}
return snapPoint;
}
}
}

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