InkCollectorNewPacketsEventHandler Delegate
Represents the method that handles the NewPackets event of an InkCollector object.
Namespace: Microsoft.Ink
Assembly: Microsoft.Ink (in microsoft.ink.dll)
Syntax
'Declaration
Public Delegate Sub InkCollectorNewPacketsEventHandler ( _
sender As Object, _
e As InkCollectorNewPacketsEventArgs _
)
'Usage
Dim instance As New InkCollectorNewPacketsEventHandler(AddressOf HandlerMethod)
public delegate void InkCollectorNewPacketsEventHandler (
Object sender,
InkCollectorNewPacketsEventArgs e
)
public delegate void InkCollectorNewPacketsEventHandler (
Object^ sender,
InkCollectorNewPacketsEventArgs^ e
)
/** @delegate */
public delegate void InkCollectorNewPacketsEventHandler (
Object sender,
InkCollectorNewPacketsEventArgs e
)
Not applicable.
Parameters
- sender
The source InkCollector object of this event.
- e
The InkCollectorNewPacketsEventArgs object that contains the event data.
Remarks
When you create an InkCollectorNewPacketsEventHandler delegate, you identify the method that handles the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For performance reasons, the default event interest is off but is turned on automatically in managed code if you add an event handler.
Packets are received while a stroke is being collected. Packet events occur rapidly, and a NewPackets event handler must be fast or ink performance suffers.
Example
This C# example draws a rectangle on the form with a bold outline when the packets are within the rectangle or with a narrow outline when the packets are outside the rectangle. This demonstrates how to use the packet events to control application behaviors.
[C#]
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.Ink;
namespace CSNewPacketEvents
{
public class Form1 : System.Windows.Forms.Form
{
//...
InkCollector theInkCollector;
int indexX, indexY;
Rectangle rectInterest;
bool thickBorder;
public Form1()
{
//...
//Initialize the InkCollector object.
theInkCollector = new InkCollector(Handle);
theInkCollector.Enabled = true;
//Initialize the target rectangle
rectInterest = new Rectangle(40, 40, 200, 80);
thickBorder = false;
//Save the X and Y data locations within the packet data.
GetXYIndexes(ref indexX, ref indexY);
//Add the event handler for new packets
theInkCollector.NewPackets += new InkCollectorNewPacketsEventHandler(NewPackets_Event);
}
//...
private void GetXYIndexes(ref int theXIndex, ref int theYIndex)
{
// Get the indexes of the X and Y data within the raw
// packet data array.
Guid [] theGuids = theInkCollector.DesiredPacketDescription;
for (int i = 0; i < theGuids.Length; i++)
{
if (theGuids[i].Equals(PacketProperty.X))
theXIndex = i;
if (theGuids[i].Equals(PacketProperty.Y))
theYIndex = i;
}
}
private void NewPackets_Event(object sender, InkCollectorNewPacketsEventArgs e)
{
Graphics g = this.CreateGraphics();
Point [] pt = new Point [1];
pt[0].X = e.PacketData[indexX];
pt[0].Y = e.PacketData[indexY];
theInkCollector.Renderer.InkSpaceToPixel(g, ref pt);
// The event may return with data for multiple packets.
// To simplify things, we'll only look at the first.
if (rectInterest.Contains(pt[0].X, pt[0].Y))
{
if (!thickBorder)
{
thickBorder = true;
Refresh();
}
}
else
{
if (thickBorder)
{
thickBorder = false;
Refresh();
}
}
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen thePen = new Pen(Color.Black, 2);
if (thickBorder)
thePen.Width = 5;
g.DrawRectangle(thePen, rectInterest);
}
// Event handler for the form's closed event
private void Form1_Closed(object sender, System.EventArgs e)
{
theInkCollector.Dispose();
theInkCollector = null;
}
}
}
This Microsoft® Visual Basic® .NET example draws a rectangle on the form with a bold outline when the packets are within the rectangle or with a narrow outline when the packets are outside the rectangle. This demonstrates how to use the packet events to control application behaviors.
Imports Microsoft.Ink
Public Class Form1
Inherits System.Windows.Forms.Form
Dim theInkCollector As InkCollector
Dim indexX, indexY As Integer
Dim rectInterest As Rectangle
Dim thickBorder As Boolean
'...
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Initialize the InkCollector object.
theInkCollector = New InkCollector(Handle)
theInkCollector.Enabled = True
'Initialize the target rectangle
rectInterest = New Rectangle(40, 40, 200, 80)
thickBorder = False
'Save the X and Y data locations within the packet data.
GetXYIndexes(indexX, indexY)
'Add the event handler for in air packets
AddHandler theInkCollector.NewPackets, AddressOf NewPackets_Event
End Sub
'...
Private Sub GetXYIndexes(ByRef theXIndex As Integer, _
ByRef theYIndex As Integer)
' Get the indexes of the X and Y data within the raw
' packet data array.
Dim theGuids() As Guid = theInkCollector.DesiredPacketDescription
Dim i As Integer
For i = 0 To theGuids.Length - 1
If theGuids(i).Equals(PacketProperty.X) Then
theXIndex = i
End If
If theGuids(i).Equals(PacketProperty.Y) Then
theYIndex = i
End If
Next
End Sub
Private Sub NewPackets_Event(ByVal sender As Object, _
ByVal e As InkCollectorNewPacketsEventArgs)
'The event may return with data for multiple packets.
'To simplify things, we'll only look at the first.
If rectInterest.Contains( _
e.PacketData(indexX), e.PacketData(indexY)) Then
If thickBorder = False Then
thickBorder = True
Refresh()
End If
Else
If thickBorder = True Then
thickBorder = False
Refresh()
End If
End If
End Sub
Private Sub Form1_Paint(ByVal sender As Object, _
ByVal e As System.Windows.Forms.PaintEventArgs) _
Handles MyBase.Paint
Dim g As Graphics = e.Graphics
Dim thePen As New Pen(Color.Black, 2)
If thickBorder Then
thePen.Width = 5
End If
g.DrawRectangle(thePen, rectInterest)
End Sub
'Event handler for the form's closed event
Private Sub Form1_Closed(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Closed
theInkCollector.Dispose()
Set theInkCollector = Nothing
End Sub
End Class
Platforms
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
Version Information
.NET Framework
Supported in: 3.0
See Also
Reference
Microsoft.Ink Namespace
Cursor
InkCollectorNewInAirPacketsEventHandler
Stroke