HitTest Method (RasterImageList)

C#
Visual Basic
Objective-C
Java
C++

public RasterImageListItem HitTest( 
   int x,
   int y
)

'Declaration
 
Public Function HitTest( _
   ByVal x As Integer, _
   ByVal y As Integer _
) As RasterImageListItem

'Usage
 
Dim instance As RasterImageList
Dim x As Integer
Dim y As Integer
Dim value As RasterImageListItem
 
value = instance.HitTest(x, y)

public:
RasterImageListItem^ HitTest( 
   int x,
   int y
)

Parameters

x: The horizontal position of the coordinate in client coordinates.
y: The vertical position of the coordinate in client coordinates.

Return Value

An RasterImageListItem object under the given location, or null (Nothing in Visual Basic) if no RasterImageListItem is under the location.

This example will create and populate a RasterImageList control, and then performs hittesting when the user right clicks on the control and shows the item information.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools.WinForms
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Drawing

Private Class MyForm4 : Inherits Form
   Private imageList As RasterImageList
   Private codecs As RasterCodecs
   Public Sub New(ByVal title As String)
      Text = title

      ' Set the size of the form
      Size = New Size(400, 200)

      ' Create a new RasterImageList control
      imageList = New RasterImageList()
      imageList.Dock = DockStyle.Fill
      imageList.SelectionMode = RasterImageListSelectionMode.Single
      imageList.Size = Size
      Controls.Add(imageList)
      imageList.BringToFront()

      codecs = New RasterCodecs()

      ' Create three items
      Dim imagesPath As String = LEAD_VARS.ImagesDir

      For i As Integer = 0 To 2
         ' Load the image
         Dim index As Integer = i + 1
         Dim imageFileName As String = Path.Combine(imagesPath, "ImageProcessingDemo\Image" & index.ToString() & ".cmp")
         Dim image As RasterImage = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)
         Dim item As RasterImageListItem = New RasterImageListItem(image, 1, "Item" & index.ToString())

         ' Select the first item
         If i = 0 Then
            item.Selected = True
         End If

         ' Add the item to the image list
         imageList.Items.Add(item)
      Next i


      ' Add a handler to the MouseDown event
      AddHandler imageList.MouseDown, AddressOf rasterImageList_MouseDown

      ' Add the RasterImageList to the control collection.
      Controls.Add(imageList)
   End Sub

   Private Sub rasterImageList_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
      ' Check for right button clicks
      If e.Button = Windows.Forms.MouseButtons.Right Then
         ' Check if any item is under the cursor poisition
         Dim imageList As RasterImageList = CType(IIf(TypeOf sender Is RasterImageList, sender, Nothing), RasterImageList)
         Dim item As RasterImageListItem = imageList.HitTest(e.X, e.Y)
         If Not item Is Nothing Then
            ' Yes, show the item text in a message box
            MessageBox.Show(Me, item.Text)
         End If
      End If
   End Sub
End Class

Public Sub RasterImageList_HitTest(ByVal title As String)
   Dim form As MyForm4 = New MyForm4(title)
   form.ShowDialog()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools.WinForms;
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;

class MyForm4 : Form
{
   RasterImageList imageList;
   RasterCodecs codecs;
   public MyForm4(string title)
   {
      Text = title;

      // Set the size of the form
      Size = new Size(400, 200);

      // Create a new RasterImageList control
      imageList = new RasterImageList();
      imageList.Dock = DockStyle.Fill;
      imageList.SelectionMode = RasterImageListSelectionMode.Single;
      imageList.Size = Size;
      Controls.Add(imageList);
      imageList.BringToFront();

      codecs = new RasterCodecs();

      // Create three items
      string imagesPath = LEAD_VARS.ImagesDir;

      for(int i = 0; i < 3; i++)
      {
         // Load the image
         int index = i + 1;
         string imageFileName = Path.Combine(imagesPath, @"ImageProcessingDemo\Image" + index.ToString() + ".cmp");
         RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1);
         RasterImageListItem item = new RasterImageListItem(image, 1, "Item" + index.ToString());

         // Select the first item
         if(i == 0)
            item.Selected = true;

         // Add the item to the image list
         imageList.Items.Add(item);
      }


      // Add a handler to the MouseDown event
      imageList.MouseDown += new MouseEventHandler(rasterImageList_MouseDown);

      // Add the RasterImageList to the control collection.
      Controls.Add(imageList);
   }

   private void rasterImageList_MouseDown(object sender, MouseEventArgs e)
   {
      // Check for right button clicks
      if(e.Button == MouseButtons.Right)
      {
         // Check if any item is under the cursor poisition
         RasterImageList imageList = sender as RasterImageList;
         RasterImageListItem item = imageList.HitTest(e.X, e.Y);
         if(item != null)
         {
            // Yes, show the item text in a message box
            MessageBox.Show(this, item.Text);
         }
      }
   }
}

public void RasterImageList_HitTest(string title)
{
   MyForm4 form = new MyForm4(title);
   form.ShowDialog();
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

RasterImageList Class
RasterImageList Members