InkPicture.NewInAirPackets 事件
會在 InkPicture 控制項偵測到感應輸入封包時發生。
命名空間： Microsoft.Ink
組件： Microsoft.Ink (在 Microsoft.Ink.dll 中)
語法
'宣告
Public Event NewInAirPackets As InkCollectorNewInAirPacketsEventHandler
'用途
Dim instance As InkPicture
Dim handler As InkCollectorNewInAirPacketsEventHandler
AddHandler instance.NewInAirPackets, handler
public event InkCollectorNewInAirPacketsEventHandler NewInAirPackets
public:
event InkCollectorNewInAirPacketsEventHandler^ NewInAirPackets {
void add (InkCollectorNewInAirPacketsEventHandler^ value);
void remove (InkCollectorNewInAirPacketsEventHandler^ value);
}
/** @event */
public void add_NewInAirPackets (InkCollectorNewInAirPacketsEventHandler value)
/** @event */
public void remove_NewInAirPackets (InkCollectorNewInAirPacketsEventHandler value)
JScript 不支援事件。
備註
當游標位於 InkPicture 控制項視窗內的時候，使用者在手寫板內容的實體偵測範圍 (鄰近) 內移動游標，或使用者在 InkPicture 控制項的相關視窗內移動滑鼠時，便會發生這個事件。
NewInAirPackets 事件的發生速度很快，因此事件處理常式必須很快進行處理，否則效能會受到影響
事件處理常式會接收 InkCollectorNewInAirPacketsEventArgs 型別的引數，其中包含這個事件的相關資料。
在建立 InkCollectorNewInAirPacketsEventHandler 委派時，您要識別處理事件的方法。若要使事件與您的事件處理常式產生關聯，請將委派的執行個體加入至事件。除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。基於效能考量，相關事件的預設是關閉的，但會在您加入事件處理常式時自動開啟。
並不僅止於插入筆墨時，即使是在選取或清除模式下，也會引發 NewInAirPackets 事件。這會需要您監視編輯模式 (您必須負責其設定)，並且在解譯事件之前注意模式。這個需求的優點是透過覺察平台事件，獲得平台創新的更大自由。
範例
這個 C# 範例會在 InkPicture 控制項 (變數名稱為 theInkPicture) 上繪製一個矩形。NewInAirPackets 事件處理常式會在 theInkPicture 偵測到感應輸入封包是在這個矩形的界限內時將矩形加上粗外框，而在 theInkPicture 偵測到感應輸入封包是在這個矩形的界限外時將矩形加上細外框。這會示範如何使用封包事件控制應用程式行為。
[C#]
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.Ink;
namespace CSInAirPacketEvents
{
public class Form1 : System.Windows.Forms.Form
{
//...
int indexX, indexY;
Rectangle rectInterest;
bool thickBorder;
public Form1()
{
//...
//Initialize the InkPicture control.
theInkPicture.InkEnabled = 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 in-air packets
theInkPicture.NewInAirPackets += new InkCollectorNewInAirPacketsEventHandler(NewInAirPackets_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 = theInkPicture.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 NewInAirPackets_Event(object sender, InkCollectorNewInAirPacketsEventArgs e)
{
Graphics g = this.CreateGraphics();
Point [] pt = new Point [1];
pt[0].X = e.PacketData[indexX];
pt[0].Y = e.PacketData[indexY];
theInkPicture.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);
}
}
}
這個 Microsoft® Visual Basic® .NET 事件處理常式會在 theInkPicture 偵測到感應輸入封包是在這個矩形的界限內時將矩形加上粗外框，而在 theInkPicture 偵測到感應輸入封包是在這個矩形的界限外時將矩形加上細外框。這會示範如何使用封包事件控制應用程式行為。
[Visual Basic]
Imports Microsoft.Ink
Public Class Form1
Inherits System.Windows.Forms.Form
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 InkPicture control.
theInkPicture.InkEnabled = 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 theInkPicture.NewInAirPackets, AddressOf NewInAirPackets_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 = theInkPicture.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 NewInAirPackets_Event(ByVal sender As Object, _
ByVal e As InkCollectorNewInAirPacketsEventArgs)
'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
End Class
平台
Windows Vista
.NET Framework 和 .NET Compact Framework 並不支援各種平台的所有版本。如需支援平台版本的相關資訊，請參閱 .NET Framework 系統需求。
版本資訊
.NET Framework
支援版本：3.0
請參閱
參考
InkCollectorNewInAirPacketsEventArgs