HitTestManager.HitTest(LayoutPageAreaBase, Point, HitTestSearchOption) Method

Returns specific document elements located under the test point.

Namespace: DevExpress.XtraRichEdit

Assembly: DevExpress.RichEdit.v24.1.Core.dll

NuGet Packages: DevExpress.RichEdit.Core, DevExpress.Win.Navigation

Declaration

C#

public RichEditHitTestResult HitTest(
    LayoutPageAreaBase pageArea,
    Point point,
    HitTestSearchOption findOption = HitTestSearchOption.Exact
)

VB.NET

Public Function HitTest(
    pageArea As LayoutPageAreaBase,
    point As Point,
    findOption As HitTestSearchOption = HitTestSearchOption.Exact
) As RichEditHitTestResult

Parameters

Name	Type	Description
pageArea	LayoutPageAreaBase	A LayoutPageAreaBase object indicating the page area to be searched.
point	Point	A Point object that is the test point.

Optional Parameters

Name	Type	Default	Description
findOption	HitTestSearchOption	Exact	One of the HitTestSearchOption enumeration values specifying the search accuracy.

Returns

Type	Description
RichEditHitTestResult	A RichEditHitTestResult object containing information about the determined element.

Remarks

Pass the findOptions parameter to set the accuracy of the hit test. The HitTest method uses the HitTestSearchOption.Exact value as the findOptions parameter by default and retrieves information about the element located exactly under the hit test point. Passing the HitTestSearchOption.Nearest value makes the HitTest method return the information about the element that is the nearest to the test point.

Tip

Refer to the following example to learn how to solve the same task using the WPF RichEditControl: Show a ToolTip that contains information about a document layout element located under the cursor position

Example

Form1.cs

if (!e.SelectedControl.Equals(richEditControl1))
    return;

//Obtain the mouse cursor's layout position on the page and the current page index:
PageLayoutPosition pageLayoutPosition = richEditControl1.ActiveView.GetDocumentLayoutPosition(e.ControlMousePosition);
if (pageLayoutPosition == null)
    return;            

Point point = pageLayoutPosition.Position;  
int pageIndex = pageLayoutPosition.PageIndex;
LayoutPage layoutPage = richEditControl1.DocumentLayout.GetPage(pageIndex);

//Create a HitTestManager instance: 
HitTestManager hitTest = new HitTestManager(richEditControl1.DocumentLayout);

//Perform the hit test and pass the result to the RichEditHitTestResult object:
RichEditHitTestResult result = hitTest.HitTest(layoutPage, point);
if (result != null)
{
    //Retrieve the current layout element type:
    LayoutElement element = result.LayoutElement;
    string text = element.Type.ToString();

    //Obtain the the text character and its bounds under the mouse position              
    if (element.Type == LayoutType.CharacterBox)
    {
        text += String.Format(" : \"{0}\"", (element as CharacterBox).Text);
        text += GetBounds(element);
        if (element.Parent.Type == LayoutType.PlainTextBox)
        {
            text += String.Format("\r\nPlainTextBox : \"{0}\"", (element.Parent as PlainTextBox).Text);
            text += GetBounds(element.Parent);
        }
    }
    else
    {
        //Get the hovered element's bounds:
        text += GetBounds(element);
    }

    //Get the element's location:
    string title = GetLocation(element);

    //Display all retrieved information in the tooltip:
    e.Info = new ToolTipControlInfo(element.Bounds, text, title, ToolTipIconType.Information);

}

Form1.vb

If Not e.SelectedControl.Equals(richEditControl1) Then
    Return
End If

'Obtain the mouse cursor's layout position on the page and the current page index:
Dim pageLayoutPosition As PageLayoutPosition = richEditControl1.ActiveView.GetDocumentLayoutPosition(e.ControlMousePosition)
If pageLayoutPosition Is Nothing Then
    Return
End If

Dim point As Point = pageLayoutPosition.Position
Dim pageIndex As Integer = pageLayoutPosition.PageIndex
Dim layoutPage As LayoutPage = richEditControl1.DocumentLayout.GetPage(pageIndex)

'Create a HitTestManager instance: 
Dim hitTest As New HitTestManager(richEditControl1.DocumentLayout)

'Perform the hit test and pass the result to the RichEditHitTestResult object:
Dim result As RichEditHitTestResult = hitTest.HitTest(layoutPage, point)
If result IsNot Nothing Then
    'Retrieve the current layout element type:
    Dim element As LayoutElement = result.LayoutElement
    Dim text As String = element.Type.ToString()

    'Obtain the the text character and its bounds under the mouse position              
    If element.Type = LayoutType.CharacterBox Then
        text &= String.Format(" : ""{0}""", (TryCast(element, CharacterBox)).Text)
        text &= GetBounds(element)
        If element.Parent.Type = LayoutType.PlainTextBox Then
            text &= String.Format(ControlChars.CrLf & "PlainTextBox : ""{0}""", (TryCast(element.Parent, PlainTextBox)).Text)
            text &= GetBounds(element.Parent)
        End If
    Else
        'Get the hovered element's bounds:
        text &= GetBounds(element)
    End If

    'Get the element's location:
    Dim title As String = GetLocation(element)

    'Display all retrieved information in the tooltip:
    e.Info = New ToolTipControlInfo(element.Bounds, text, title, ToolTipIconType.Information)

End If