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HitTest Method

Summary

Queries the specified location to determine if the point is over an IImageListItem.

Syntax

C++

public int HitTest( 
   Point point 
)

  
Public Function HitTest( _ 
   ByVal point As Point _ 
) As Integer

public: 
int HitTest(  
   Point point 
)

Parameters

point
The horizontal and vertical position of the coordinate in client coordinates.

Return Value

The index of the item in ItemsSource under the given location, or -1 if no IImageListItem is under the location.

Example

Silverlight C#

Silverlight VB

using Leadtools.Help; 
using Leadtools.Windows.Controls; 
using Leadtools; 
using Leadtools.Codecs; 
 
class MyWindow3 : Window 
{ 
   ImageList imageList; 
 
   public MyWindow3(string title) 
   { 
      Title = title; 
 
      // Set the size of the form 
      Width = 400; 
      Height = 200; 
 
      // Create a new ImageList control 
      imageList = new ImageList(); 
      imageList.Background = Brushes.Red; 
      imageList.SelectionMode = SelectionMode.Single; 
      imageList.Width = Width; 
      imageList.Height = Height; 
 
      Content = imageList; 
 
      // 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() + ".jpg"); 
 
         ImageListItem item = new ImageListItem(); 
         item.Source = new BitmapImage(new Uri(imageFileName)); 
         item.Text = "item" + index.ToString(); 
 
         // Select the first item 
         if (i == 0) 
            item.IsSelected = true; 
 
         // Add the item to the image list 
         imageList.Items.Add(item); 
      } 
 
      // Add a handler to the MouseDown event 
      AddHandler(ImageListItem.MouseDownEvent, new MouseButtonEventHandler(ImageList_MouseDown)); 
      imageList.PreviewMouseDown += new MouseButtonEventHandler(ImageList_MouseDown); 
   } 
 
   private void ImageList_MouseDown(object sender, MouseButtonEventArgs e) 
   { 
      // Check for right button clicks 
      if (e.RightButton == MouseButtonState.Pressed) 
      { 
         // Check if any item is under the cursor poisition 
         ImageList imageList = sender as ImageList; 
         ImageListItem item = imageList.Items[imageList.HitTest(e.GetPosition(imageList))] as ImageListItem; 
         if (item != null) 
         { 
            // Yes, show the item text in a message box 
            MessageBox.Show(this, item.Text); 
         } 
      } 
   } 
} 
 
public void ImageList_HitTest(string title) 
{ 
   MyWindow3 window = new MyWindow3(title); 
   window.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools.Windows.Controls 
Imports Leadtools.Codecs 
Imports Leadtools 
 
Private Class MyWindow3 : Inherits Window 
   Private imageList As ImageList 
 
   Public Sub New(ByVal title As String) 
      title = title 
 
      ' Set the size of the form 
      Width = 400 
      Height = 200 
 
      ' Create a new ImageList control 
      imageList = New ImageList() 
      imageList.Background = Brushes.Red 
      imageList.SelectionMode = SelectionMode.Single 
      imageList.Width = Width 
      imageList.Height = Height 
 
      Content = imageList 
 
      ' 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() & ".jpg") 
 
         Dim item As ImageListItem = New ImageListItem() 
         item.Source = New BitmapImage(New Uri(imageFileName)) 
         item.Text = "item" & index.ToString() 
 
         ' Select the first item 
         If i = 0 Then 
            item.IsSelected = 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.PreviewMouseDown, AddressOf ImageList_MouseDown 
   End Sub 
 
   Private Sub ImageList_MouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      ' Check for right button clicks 
      If e.RightButton = MouseButtonState.Pressed Then 
         ' Check if any item is under the cursor poisition 
         Dim imageList As ImageList = TryCast(sender, ImageList) 
         Dim item As ImageListItem = TryCast(imageList.Items(imageList.HitTest(e.GetPosition(imageList))), ImageListItem) 
         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 ImageList_HitTest(ByVal title As String) 
   Dim window As MyWindow3 = New MyWindow3(title) 
   window.ShowDialog() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

using Leadtools.Help; 
using Leadtools.Windows.Controls; 
 
class MyWindow3 : ChildWindow 
{ 
   ImageList imageList; 
 
   public MyWindow3(string title) 
   { 
      Title = title; 
 
      // Set the size of the form 
      Width = 400; 
      Height = 200; 
 
      // Create a new ImageList control 
      imageList = new ImageList(); 
      imageList.Background = new SolidColorBrush(Colors.Red); 
      imageList.SelectionMode = SelectionMode.Single; 
      imageList.Width = Width; 
      imageList.Height = Height; 
 
      Content = imageList; 
 
      // Create three items 
      string imagesPath = LeadtoolsExamples.Common.ImagesPath.Path; 
 
      for (int i = 0; i < 3; i++) 
      { 
         // Load the image 
         int index = i + 1; 
         string imageFileName = imagesPath + "Image" + index.ToString() + ".jpg"; 
 
         ImageListItem item = new ImageListItem(); 
         item.Source = new BitmapImage(new Uri(imageFileName)); 
         item.Text = "item" + index.ToString(); 
 
         // Select the first item 
         if (i == 0) 
            item.IsSelected = true; 
 
         // Add the item to the image list 
         imageList.Items.Add(item); 
      } 
 
      // Add a handler to the MouseDown event 
      AddHandler(ImageListItem.MouseLeftButtonDownEvent, new MouseButtonEventHandler(imageList_MouseLeftButtonDown), false); 
      imageList.MouseLeftButtonDown += new MouseButtonEventHandler(imageList_MouseLeftButtonDown); 
   } 
 
   void imageList_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
   { 
      // Check if any item is under the cursor position 
      ImageList imageList = sender as ImageList; 
      ImageListItem item = imageList.Items[imageList.HitTest(e.GetPosition(imageList))] as ImageListItem; 
      if (item != null) 
      { 
         // Yes, show the item text in a message box 
         MessageBox.Show(item.Text); 
      } 
   } 
} 
 
public void ImageList_HitTest(string title) 
{ 
   MyWindow3 window = new MyWindow3(title); 
   window.Show(); 
}

Imports Leadtools.Windows.Controls 
 
Private Class MyWindow3 : Inherits ChildWindow 
   Private imageList As ImageList 
 
   Public Sub New(ByVal title As String) 
      title = title 
 
      ' Set the size of the form 
      Width = 400 
      Height = 200 
 
      ' Create a new ImageList control 
      imageList = New ImageList() 
      imageList.Background = New SolidColorBrush(Colors.Red) 
      imageList.SelectionMode = SelectionMode.Single 
      imageList.Width = Width 
      imageList.Height = Height 
 
      Content = imageList 
 
      ' Create three items 
      Dim imagesPath As String = LeadtoolsExamples.Common.ImagesPath.Path 
 
      For i As Integer = 0 To 2 
         ' Load the image 
         Dim index As Integer = i + 1 
         Dim imageFileName As String = imagesPath & "Image" & index.ToString() & ".jpg" 
 
         Dim item As ImageListItem = New ImageListItem() 
         item.Source = New BitmapImage(New Uri(imageFileName)) 
         item.Text = "item" & index.ToString() 
 
         ' Select the first item 
         If i = 0 Then 
            item.IsSelected = 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.MouseLeftButtonDown, AddressOf imageList_MouseLeftButtonDown 
   End Sub 
 
   Private Sub imageList_MouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      ' Check if any item is under the cursor position 
      Dim imageList As ImageList = TryCast(sender, ImageList) 
      Dim item As ImageListItem = TryCast(imageList.Items(imageList.HitTest(e.GetPosition(imageList))), ImageListItem) 
      If Not item Is Nothing Then 
         ' Yes, show the item text in a message box 
         MessageBox.Show(item.Text) 
      End If 
   End Sub 
End Class 
 
Public Sub ImageList_HitTest(ByVal title As String) 
   Dim window As MyWindow3 = New MyWindow3(title) 
   window.Show() 
End Sub

Requirements

Target Platforms

Reference

ImageList Class

ImageList Members

Help Version 19.0.2017.10.27

Leadtools.Windows.Controls Assembly

Introduction

Getting Started

Namespaces

Leadtools.Windows.Controls Namespace

Assemblies