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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
namespace SupportTool.Controls
{
public class FlexPanel : Panel
{
public static bool GetFlex(DependencyObject obj) => (bool)obj.GetValue(FlexProperty);
public static void SetFlex(DependencyObject obj, bool value) => obj.SetValue(FlexProperty, value);
public static readonly DependencyProperty FlexProperty = DependencyProperty.RegisterAttached("Flex", typeof(bool), typeof(FlexPanel), new PropertyMetadata(false));
public static int GetFlexWeight(DependencyObject obj) => (int)obj.GetValue(FlexWeightProperty);
public static void SetFlexWeight(DependencyObject obj, int value) => obj.SetValue(FlexWeightProperty, value);
public static readonly DependencyProperty FlexWeightProperty = DependencyProperty.RegisterAttached("FlexWeight", typeof(int), typeof(FlexPanel), new PropertyMetadata(1));
public Orientation Orientation
{
get => (Orientation)GetValue(OrientationProperty);
set => SetValue(OrientationProperty, value);
}
public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register(nameof(Orientation), typeof(Orientation), typeof(FlexPanel), new PropertyMetadata(Orientation.Vertical));
protected override Size MeasureOverride(Size availableSize)
{
var desiredSize = new Size();
foreach (UIElement child in Children)
{
child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
if (Orientation == Orientation.Vertical)
{
desiredSize.Height += child.DesiredSize.Height;
desiredSize.Width = Math.Max(desiredSize.Width, child.DesiredSize.Width);
}
else
{
desiredSize.Width += child.DesiredSize.Width;
desiredSize.Height = Math.Max(desiredSize.Height, child.DesiredSize.Height);
}
}
if (double.IsPositiveInfinity(availableSize.Height) || double.IsPositiveInfinity(availableSize.Width)) return desiredSize;
else return availableSize;
}
protected override Size ArrangeOverride(Size finalSize)
{
var currentLength = 0d;
var totalLength = 0d;
var flexChildrenWeightParts = 0;
if (Orientation == Orientation.Vertical)
{
foreach (UIElement child in Children)
{
if (GetFlex(child)) flexChildrenWeightParts += GetFlexWeight(child);
else totalLength += child.DesiredSize.Height;
}
var flexSize = Math.Max(0, (finalSize.Height - totalLength) / flexChildrenWeightParts);
foreach (UIElement child in Children)
{
var arrangeRect = new Rect();
if (GetFlex(child)) arrangeRect = new Rect(0, currentLength, finalSize.Width, flexSize * GetFlexWeight(child));
else arrangeRect = new Rect(0, currentLength, finalSize.Width, child.DesiredSize.Height);
child.Arrange(arrangeRect);
currentLength += arrangeRect.Height;
}
}
else
{
foreach (UIElement child in Children)
{
if (GetFlex(child)) flexChildrenWeightParts += GetFlexWeight(child);
else totalLength += child.DesiredSize.Width;
}
var flexSize = Math.Max(0, (finalSize.Width - totalLength) / flexChildrenWeightParts);
foreach (UIElement child in Children)
{
var arrangeRect = new Rect();
if (GetFlex(child)) arrangeRect = new Rect(currentLength, 0, flexSize * GetFlexWeight(child), finalSize.Height);
else arrangeRect = new Rect(currentLength, 0, child.DesiredSize.Width, finalSize.Height);
child.Arrange(arrangeRect);
currentLength += arrangeRect.Width;
}
}
return finalSize;
}
}
}
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