// <SnippetHitTestingOverviewSnippet13>
// Override default hit test support in visual object.
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
IntersectionDetail intersectionDetail = IntersectionDetail.NotCalculated;
// Perform custom actions during the hit test processing.
return(new GeometryHitTestResult(this, intersectionDetail));
}
//dont hit test, these are just overlay graphics
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
if (IsHitTestVisible)
{
return(base.HitTestCore(hitTestParameters));
}
return(null);
}
// <SnippetHitTestingOverviewSnippet14>
// Override default hit test support in visual object.
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
// Perform actions based on hit test of bounding rectangle.
// Return results of base class hit testing,
// which only returns hit on the geometry of visual objects.
return(base.HitTestCore(hitTestParameters));
}
protected override GeometryHitTestResult HitTestCore
(GeometryHitTestParameters hitTestParameters)
{
var geometry = new RectangleGeometry(VisualTreeHelper.GetDescendantBounds(this));
return(new GeometryHitTestResult
(this, geometry.FillContainsWithDetail(hitTestParameters.HitGeometry)));
}
public List <DrawingVisual> GetVisuals(System.Windows.Media.Geometry region)
{
hits.Clear();
GeometryHitTestParameters parameters = new GeometryHitTestParameters(region);
HitTestResultCallback callback = HitTestCallback;
VisualTreeHelper.HitTest(this, null, callback, parameters);
return(hits);
}
public List <DrawingVisual> GetVisuals(Geometry region)
{
hits.Clear();
GeometryHitTestParameters parameters = new GeometryHitTestParameters(region);
HitTestResultCallback callback = new HitTestResultCallback(this.HitTestCallback);
VisualTreeHelper.HitTest(this, null, callback, parameters);
return(hits);
}
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
if (_content != null)
{
var result = _content.HitTest(hitTestParameters);
}
return(base.HitTestCore(hitTestParameters));
}
public List <DrawingVisual> GetVisuals(Geometry region) //region对象用于命中测试
{
hits.Clear(); //情况命中测试结果的集合
GeometryHitTestParameters parameters = new GeometryHitTestParameters(region);
HitTestResultCallback callback = new HitTestResultCallback(this.HitTestCallback);
//通过调用VisualTreeHelper.HitTest()方法启动命中测试过程
VisualTreeHelper.HitTest(this, null, callback, parameters);
//当该过程结束时，该方法返回包含所有找到的可视化对象的集合
return(hits);
}
public IEnumerable <DrawingVisual> GetVisuals(Geometry region)
{
// Очистить результаты предыдущего поиска
_hits.Clear();
// Подготовить параметры для операции проверки попадания (геометрию и обратный вызов)
var parameters = new GeometryHitTestParameters(region);
var callback = new HitTestResultCallback(HitTestCallback);
// Поиск попаданий
VisualTreeHelper.HitTest(this, null, callback, parameters);
return(_hits);
}
/// <summary>
/// The base wire control attempts to do manhattan hit testing. This is a bug and the default should
/// rely on WPF. Once that is corrected this can be removed.
/// </summary>
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
List <DependencyObject> results = new List <DependencyObject>();
VisualTreeHelper.HitTest(InnerWire, null,
r =>
{
results.Add(r.VisualHit);
return(HitTestResultBehavior.Stop);
}, new GeometryHitTestParameters(hitTestParameters.HitGeometry));
return(new GeometryHitTestResult(results.FirstOrDefault() as Visual, IntersectionDetail.NotCalculated));
}
private void NodeGraphView_OnMouseMove(object sender, MouseEventArgs e)
{
if (m_isDrawinSelectionRect)
{
Point mousePos = e.GetPosition(NodeCanvas);
if (mousePos.X > m_selectionStartPoint.X)
{
Canvas.SetLeft(SelectionRect, m_selectionStartPoint.X);
SelectionRect.Width = mousePos.X - m_selectionStartPoint.X;
}
else
{
Canvas.SetLeft(SelectionRect, mousePos.X);
SelectionRect.Width = m_selectionStartPoint.X - mousePos.X;
}
if (mousePos.Y > m_selectionStartPoint.Y)
{
Canvas.SetTop(SelectionRect, m_selectionStartPoint.Y);
SelectionRect.Height = mousePos.Y - m_selectionStartPoint.Y;
}
else
{
Canvas.SetTop(SelectionRect, mousePos.Y);
SelectionRect.Height = m_selectionStartPoint.Y - mousePos.Y;
}
var rect = new RectangleGeometry(new Rect(m_selectionStartPoint, mousePos));
var hitTestParams = new GeometryHitTestParameters(rect);
HashSet <CScriptNodeViewmodel> containedNodes = new HashSet <CScriptNodeViewmodel>();
var resultCallback = new HitTestResultCallback(element =>
{
return(HitTestResultBehavior.Continue);
});
var filterCallback = new HitTestFilterCallback(element =>
{
if (element is FrameworkElement uiElement)
{
if (uiElement.DataContext is CScriptNodeViewmodel vm)
{
containedNodes.Add(vm);
return(HitTestFilterBehavior.ContinueSkipSelfAndChildren);
}
}
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(NodeCanvas, filterCallback, resultCallback, hitTestParams);
((CNodeGraphViewModel)DataContext).SelectNodes(containedNodes);
}
}
private static List <T> GetShapesHit <T>(Visual surface, Point p, Func <List <T>, Point, HitTestResultCallback> target)
{
var shapesHit = new List <T>();
var callback = new HitTestResultCallback(target(shapesHit, p));
// Specify that the hit test should search for every shape within 2 pixels of the mouse click.
var rect = new Rect(new Point(p.X - 2, p.Y - 2), new Size(5, 5));
var parameters = new GeometryHitTestParameters(new RectangleGeometry(rect));
// Perform the hit test
VisualTreeHelper.HitTest(surface, null, callback, parameters);
return(shapesHit);
}
public List <DrawingVisual> GetVisuals(Geometry region)
{
// Очистить результаты предыдущей проверки
_hits.Clear();
// Подготовить параметры для операции проверки попадания (геометрию и обратный вызов).
var parameters = new GeometryHitTestParameters(region);
HitTestResultCallback callback = HitTestCallback;
VisualTreeHelper.HitTest(this, null, callback, parameters);
return(_hits);
}
/// <summary>
/// Initiates a hit test on the specified Visual object, with called-defined HitTestFilterCallback and HitTestResultCallback methods.
/// </summary>
/// <param name="region">The region to hit test against.</param>
/// <returns></returns>
public List <DrawingVisual> GetVisuals(Geometry region)
{
// Remove matches from the previous search.
hits.Clear();
// Prepare the parameters for the hit test operation.
// The geometry and callback.
GeometryHitTestParameters parameters = new GeometryHitTestParameters(region);
HitTestResultCallback callback = new HitTestResultCallback(this.HitTestCallback);
// Search for hits.
VisualTreeHelper.HitTest(this, null, callback, parameters);
return(hits);
}
private FrameworkElement FindNearbyCurve(Point point)
{
var vec = new Vector(5, 5);
var geometry = new RectangleGeometry(new Rect(point - vec, point + vec));
var htParams = new GeometryHitTestParameters(geometry);
var curve = (FrameworkElement)primitiveCurvesRoot.HitTestFirst(
htParams,
dp =>
{
var fwElement = dp as FrameworkElement;
return(fwElement != null && NewPrimitiveCurvesControl.GetPrimitiveCurve(fwElement) != null);
});
return(curve);
}
public static T AreaHitTest <T>(this FrameworkElement element, Point center, double radius)
where T : DependencyObject
{
T hitTestResult = null;
var hitTestParams = new GeometryHitTestParameters(new EllipseGeometry(center, radius, radius));
var resultCallback = new HitTestResultCallback(t => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(t =>
{
hitTestResult = GetParent <T>(t as FrameworkElement);
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(element, filterCallback, resultCallback, hitTestParams);
return(hitTestResult);
}
public static IList <T> AreaHitTest <T>(this FrameworkElement element, Point startPoint, double width, double height)
where T : DependencyObject
{
var result = new List <T>();
var hitTestParams = new GeometryHitTestParameters(new RectangleGeometry(new Rect(startPoint, new Size(width, height))));
var resultCallback = new HitTestResultCallback(t => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(t =>
{
result.Add(GetParent <T>(t as FrameworkElement));
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(element, filterCallback, resultCallback, hitTestParams);
return(result.Where(c => c != null).Distinct().ToList());
}
/// <summary>
/// Runs a hit test on children of the container within the rectangle matching all elements that have a data context of
/// T
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="container"></param>
/// <param name="rectangleGeometry"></param>
/// <returns></returns>
public static List <T> GetHitViewModels <T>(Visual container, RectangleGeometry rectangleGeometry)
{
List <T> result = new List <T>();
GeometryHitTestParameters hitTestParams = new GeometryHitTestParameters(rectangleGeometry);
HitTestResultCallback resultCallback = new HitTestResultCallback(r => HitTestResultBehavior.Continue);
HitTestFilterCallback filterCallback = new HitTestFilterCallback(e =>
{
if (e is FrameworkElement fe && fe.DataContext is T context && !result.Contains(context))
{
result.Add(context);
}
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(container, filterCallback, resultCallback, hitTestParams);
return(result);
}
public static List <T> GetItemAt <T>(this ListView listview, Rect areaOfInterest)
{
var list = new List <T>();
var rect = new RectangleGeometry(areaOfInterest);
var hitTestParams = new GeometryHitTestParameters(rect);
var resultCallback = new HitTestResultCallback(x => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(x =>
{
if (x is ListViewItem)
{
var item = (T)((ListViewItem)x).Content;
list.Add(item);
}
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(listview, filterCallback, resultCallback, hitTestParams);
return(list);
}
public static bool IsWithinElementBounds(Visual visual, Geometry geometry)
{
bool result = false;
GeometryHitTestParameters hitTestParameters = new GeometryHitTestParameters(geometry);
VisualTreeHelper.HitTest(visual, null, delegate(HitTestResult candidate)
{
switch (((GeometryHitTestResult)candidate).IntersectionDetail)
{
case IntersectionDetail.FullyInside:
case IntersectionDetail.FullyContains:
case IntersectionDetail.Intersects:
result = true;
break;
}
return(HitTestResultBehavior.Stop);
}, hitTestParameters);
return(result);
}
public static DependencyObject[] HitTestRange(this FrameworkElement container, Rect range)
{
var selectedElements = new List <DependencyObject>();
var rect = new RectangleGeometry(range);
var hitTestParams = new GeometryHitTestParameters(rect);
var resultCallback = new HitTestResultCallback(result => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(element =>
{
if (VisualTreeHelper.GetParent(element) == container)
{
selectedElements.Add(element);
}
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(container, filterCallback, resultCallback, hitTestParams);
return(selectedElements.ToArray());
}
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
var source = (BitmapSource)Source;
var rect = new Int32Rect((int)hitTestParameters.HitGeometry.Bounds.Left, (int)hitTestParameters.HitGeometry.Bounds.Top, (int)hitTestParameters.HitGeometry.Bounds.Width, (int)hitTestParameters.HitGeometry.Bounds.Height);
int stride = (int)source.PixelWidth * (source.Format.BitsPerPixel / 8);
byte[] pixels = new byte[(int)rect.Height * stride];
source.CopyPixels(rect, pixels, stride, 0);
if (!pixels.Contains((byte)0))
{
}
IntersectionDetail intersectionDetail = IntersectionDetail.NotCalculated;
// Perform custom actions during the hit test processing.
return(new GeometryHitTestResult(this, intersectionDetail));
}
public List <DrawingVisual> GetVisuals(Geometry region)
{
var hits = new List <DrawingVisual>();
var paramters = new GeometryHitTestParameters(region);
var callback = new HitTestResultCallback(
(HitTestResult result) =>
{
var geometryResult = result as GeometryHitTestResult;
var visual = geometryResult.VisualHit as DrawingVisual;
if (visual != null && geometryResult.IntersectionDetail == IntersectionDetail.FullyInside)
{
hits.Add(visual);
}
return(HitTestResultBehavior.Continue);
});
VisualTreeHelper.HitTest(this, null, callback, paramters);
return(hits);
}
private void EmphasizeSketchCurves(Point point)
{
if (lastEmphasizedSketchCurve != null)
{
lastEmphasizedSketchCurve.IsEmphasized = false;
}
var vec = new Vector(5, 5);
var geometry = new RectangleGeometry(new Rect(point - vec, point + vec));
var htParams = new GeometryHitTestParameters(geometry);
lastEmphasizedSketchCurve = sketchImageView
.HitTestAll(htParams, dp => dp is Path)
.Cast <Path>()
.Select(x => x.DataContext)
.OfType <PointsSequence>()
.FirstOrDefault();
if (lastEmphasizedSketchCurve != null)
{
lastEmphasizedSketchCurve.IsEmphasized = true;
}
}
public IEnumerable <IElement> HitTest(IRect rect)
{
var canvas = this;
var r = new Rect(new Point(rect.X1, rect.Y1), new Point(rect.X2, rect.Y2));
var selectedElements = new List <DependencyObject>();
var rectangle = new RectangleGeometry(r, 0.0, 0.0);
var hitTestParams = new GeometryHitTestParameters(rectangle);
var resultCallback = new HitTestResultCallback(result => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(
element =>
{
if (VisualTreeHelper.GetParent(element) == canvas)
{
selectedElements.Add(element);
}
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(canvas, filterCallback, resultCallback, hitTestParams);
return(selectedElements.Cast <IElement>());
}
public List <DependencyObject> HitTest(Visual visual, IPoint point, double radius)
{
var elements = new List <DependencyObject>();
var elippse = new EllipseGeometry()
{
RadiusX = radius,
RadiusY = radius,
Center = new Point(point.X, point.Y),
};
var hitTestParams = new GeometryHitTestParameters(elippse);
var resultCallback = new HitTestResultCallback(result => HitTestResultBehavior.Continue);
var filterCallback = new HitTestFilterCallback(
element =>
{
elements.Add(element);
return(HitTestFilterBehavior.Continue);
});
VisualTreeHelper.HitTest(visual, filterCallback, resultCallback, hitTestParams);
return(elements);
}
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
return(new GeometryHitTestResult(this, IntersectionDetail.FullyContains));
}
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
return(null);
}
/// <summary>
/// Viewport3DVisual does not yet support Geometry hit testing.
/// </summary>
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
throw new NotSupportedException(SR.Get(SRID.HitTest_Invalid, typeof(GeometryHitTestParameters).Name, this.GetType().Name));
}
protected override GeometryHitTestResult HitTestCore (GeometryHitTestParameters hitTestParameters)
{
throw new NotImplementedException ();
}
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
// Do something similar here, possibly checking every pixel within
// the hitTestParameters.HitGeometry.Bounds rectangle
return(base.HitTestCore(hitTestParameters));
}
