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| public class Arrow : Shape
{
public static GridLength LengthDefault { get; }
= new GridLength(10);
protected override Geometry DefiningGeometry => ArrowGeometry;
/// <summary>Линия стрелки-указателя.
/// В <see cref="PathFigure.StartPoint"/> координата левого кончика.</summary>
protected readonly PathFigure ArrowFigure = new PathFigure() { IsClosed = true };
protected readonly PathGeometry ArrowGeometry;
/// <summary>Сегменты стрелки указателя:<br/>
/// 0 - верх левого наконечника;<br/>
/// 1 - верхний левый угол тела;<br/>
/// 2 - верхний правый угол тела;<br/>
/// 3 - вверх правого наконечника;<br/>
/// 4 - правый кончик;<br/>
/// 5 - низ правого наконечника;<br/>
/// 6 - нижний правый угол тела;<br/>
/// 7 - нижний левый угол тела;<br/>
/// 8 - низ левого наконечника.</summary>
protected readonly ReadOnlyCollection<LineSegment> ArrowSegments;
public Arrow()
{
LineSegment[] arrowSegments = new LineSegment[9];
for (int i = 0; i < 9; i++)
ArrowFigure.Segments.Add(arrowSegments[i] = new LineSegment());
ArrowSegments = Array.AsReadOnly(arrowSegments);
ArrowGeometry = new PathGeometry();
ArrowGeometry.Figures.Add(ArrowFigure);
}
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == StrokeThicknessProperty
|| e.Property == ActualWidthProperty
|| e.Property == ActualHeightProperty)
{
Rect rect = LayoutInformation.GetLayoutSlot(this);
RenderArrow(rect.Width, rect.Height);
}
}
public GridLength TipLength
{
get { return (GridLength)GetValue(TipLengthProperty); }
set { SetValue(TipLengthProperty, value); }
}
// Using a DependencyProperty as the backing store for TipLength. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TipLengthProperty =
DependencyProperty.Register(nameof(TipLength), typeof(GridLength), typeof(Arrow),
new FrameworkPropertyMetadata(LengthDefault) { CoerceValueCallback = LengthCoerce, AffectsMeasure = true });
private static object LengthCoerce(DependencyObject d, object baseValue)
{
Arrow arrow = (Arrow)d;
GridLength newLength = (GridLength)baseValue;
if (newLength.IsAuto)
return LengthDefault;
return newLength;
}
public GridLength BodyThickness
{
get { return (GridLength)GetValue(BodyThicknessProperty); }
set { SetValue(BodyThicknessProperty, value); }
}
// Using a DependencyProperty as the backing store for ThicknessBody. This enables animation, styling, binding, etc...
public static readonly DependencyProperty BodyThicknessProperty =
DependencyProperty.Register(nameof(BodyThickness), typeof(GridLength), typeof(Arrow),
new FrameworkPropertyMetadata(LengthDefault) { CoerceValueCallback = LengthCoerce, AffectsMeasure = true });
public bool LeftTipVisibility
{
get { return (bool)GetValue(LeftTipVisibilityProperty); }
set { SetValue(LeftTipVisibilityProperty, value); }
}
// Using a DependencyProperty as the backing store for LeftTipVisibility. This enables animation, styling, binding, etc...
public static readonly DependencyProperty LeftTipVisibilityProperty =
DependencyProperty.Register(nameof(LeftTipVisibility), typeof(bool), typeof(Arrow),
new FrameworkPropertyMetadata(true, RenderArrow) { AffectsMeasure = true });
public bool RightTipVisibility
{
get { return (bool)GetValue(RightTipVisibilityProperty); }
set { SetValue(RightTipVisibilityProperty, value); }
}
// Using a DependencyProperty as the backing store for RightTipVisibility. This enables animation, styling, binding, etc...
public static readonly DependencyProperty RightTipVisibilityProperty =
DependencyProperty.Register(nameof(RightTipVisibility), typeof(bool), typeof(Arrow),
new FrameworkPropertyMetadata(true, RenderArrow) { AffectsMeasure = true });
private static void RenderArrow(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Arrow arrow = (Arrow)d;
Rect rect = LayoutInformation.GetLayoutSlot(arrow);
arrow.RenderArrow(rect.Width, rect.Height);
}
private void RenderArrow(double actualWidth, double actualHeight)
{
// Определение размеров стрелки
if (actualHeight > ActualHeight)
actualHeight = ActualHeight;
if (actualWidth > ActualWidth)
actualWidth = ActualWidth;
double minWidth = 0;
if (TipLength.IsAbsolute && (LeftTipVisibility || RightTipVisibility))
{
minWidth = TipLength.Value + StrokeThickness;
if (LeftTipVisibility && RightTipVisibility)
minWidth *= 2;
}
double minHeight = 0;
if (BodyThickness.IsAbsolute)
minHeight = BodyThickness.Value + StrokeThickness;
if (actualHeight < minHeight)
actualHeight = minHeight;
if (actualWidth < minWidth)
actualWidth = minWidth;
// Размеры за вычетом границы
double left = StrokeThickness * 0.5;
double top = left;
double bottom = actualHeight - top;
double right = actualWidth - left;
double height = bottom - top;
double width = right - left;
if (width < 0)
{
}
// Вычисление толщины тела стрелки
double bodyHeight = BodyThickness.Value;
if (BodyThickness.IsStar)
bodyHeight *= height;
// Вычисление длины наконечников
double tipLength = TipLength.Value;
if (TipLength.IsStar)
tipLength *= width;
// Вычисление границ тела
double bodyLeft = left + (LeftTipVisibility ? tipLength : 0);
double bodyRight = right - (RightTipVisibility ? tipLength : 0);
double bodyTop = (height - bodyHeight) * 0.5;
double bodyBottom = bodyTop + bodyHeight;
// Центр высоты
double medHeight = top + height * 0.5;
// Кончики стрелки
ArrowFigure.StartPoint = new Point(left, medHeight);
ArrowSegments[4].Point = new Point(right, medHeight);
// Точки левого наконечника
if (LeftTipVisibility)
{
ArrowSegments[0].Point = new Point(bodyLeft, top);
ArrowSegments[8].Point = new Point(bodyLeft, bottom);
}
else
{
ArrowSegments[0].Point = new Point(bodyLeft, bodyTop);
ArrowSegments[8].Point = new Point(bodyLeft, bodyBottom);
}
// Точки правого наконечника
if (RightTipVisibility)
{
ArrowSegments[3].Point = new Point(bodyRight, top);
ArrowSegments[5].Point = new Point(bodyRight, bottom);
}
else
{
ArrowSegments[3].Point = new Point(bodyRight, bodyTop);
ArrowSegments[5].Point = new Point(bodyRight, bodyBottom);
}
// Точки тела
ArrowSegments[1].Point = new Point(bodyLeft, bodyTop);
ArrowSegments[2].Point = new Point(bodyRight, bodyTop);
ArrowSegments[7].Point = new Point(bodyLeft, bodyBottom);
ArrowSegments[6].Point = new Point(bodyRight, bodyBottom);
}
// Oпределение размеров стрелки указателя
protected override Size MeasureOverride(Size constraint)
{
double minWidth = 0;
if (TipLength.IsAbsolute && (LeftTipVisibility || RightTipVisibility))
{
minWidth = TipLength.Value + StrokeThickness;
if (LeftTipVisibility && RightTipVisibility)
minWidth *= 2;
}
double minHeight = 0;
if (BodyThickness.IsAbsolute)
minHeight = BodyThickness.Value + StrokeThickness;
if (constraint.Width < minWidth || constraint.Height < minHeight)
constraint = new Size
(
constraint.Width < minWidth ? minWidth : constraint.Width,
constraint.Height < minHeight ? minHeight : constraint.Height
);
RenderArrow(constraint.Width, constraint.Height);
return base.MeasureOverride(constraint);
}
} |
Сообщение было отмечено Элд Хасп как решение
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