Freigeben über

Gewusst wie: Hinzufügen von benutzerdefinierten Daten zu Freihanddaten

Benutzerdefinierte Daten können Freihanddaten hinzugefügt werden, die gespeichert werden, wenn die Freihanddaten als ISF (Ink Serialized Format)-Daten gespeichert werden. Sie können die benutzerdefinierten Daten in dem Objekt DrawingAttributes, StrokeCollection oder Stroke speichern. Durch die Möglichkeit benutzerdefinierte Daten in drei Objekten zu speichern, kann der beste Ort zum Speichern ausgewählt werden. Alle drei Klassen verwenden ähnliche Methoden, um benutzerdefinierte Daten zu speichern und auf diese zuzugreifen.

Nur die folgenden Typen können als benutzerdefinierte Daten gespeichert werden:

Beispiel

Im folgenden Beispiel wird veranschaulicht, wie benutzerdefinierte Daten einem StrokeCollection-Objekt hinzugefügt und daraus abgerufen werden.

Private timestamp As New Guid("12345678-9012-3456-7890-123456789012")


' Add a timestamp to the StrokeCollection.
Private Sub AddTimestamp() 

    inkCanvas1.Strokes.AddPropertyData(timestamp, DateTime.Now)

End Sub 'AddTimestamp


' Get the timestamp of the StrokeCollection.
Private Sub GetTimestamp() 

    If inkCanvas1.Strokes.ContainsPropertyData(timestamp) Then
        Dim [date] As Object = inkCanvas1.Strokes.GetPropertyData(timestamp)

        If TypeOf [date] Is DateTime Then
            MessageBox.Show("This StrokeCollection's timestamp is " + CType([date], DateTime).ToString())
        End If
    Else
        MessageBox.Show("The StrokeCollection does not have a timestamp.")
    End If

End Sub 'GetTimestamp

Guid timestamp = new Guid("12345678-9012-3456-7890-123456789012");

// Add a timestamp to the StrokeCollection.
private void AddTimestamp()
{

    inkCanvas1.Strokes.AddPropertyData(timestamp, DateTime.Now);
}

// Get the timestamp of the StrokeCollection.
private void GetTimestamp()
{

    if (inkCanvas1.Strokes.ContainsPropertyData(timestamp))
    {
        object date = inkCanvas1.Strokes.GetPropertyData(timestamp);

        if (date is DateTime)
        {
            MessageBox.Show("This StrokeCollection's timestamp is " +
                ((DateTime)date).ToString());
        }
    }
    else
    {
        MessageBox.Show(
            "The StrokeCollection does not have a timestamp.");
    }
}

Im folgenden Beispiel wird eine Anwendung erstellt, die ein InkCanvas-Steuerelement und zwei Schaltflächen anzeigt. Die Schaltfläche switchAuthor aktiviert zwei Stifte, die von zwei verschiedenen Autoren verwendet werden können. Die Schaltfläche changePenColors ändert je nach Autor die Farbe jedes Strichs auf dem InkCanvas-Steuerelement. Die Anwendung definiert zwei DrawingAttributes-Objekte und fügt jedem eine benutzerdefinierte Eigenschaft hinzu, die anzeigt, von welchem Autor Stroke gezeichnet wurde. Wenn der Benutzer auf changePenColors klickt, ändert die Anwendung dem Wert der benutzerdefinierten Eigenschaft entsprechend die Darstellung des Strichs.

<Window x:Class="Window1"
    xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
    Title="Adding Custom Data to Ink" Height="500" Width="700"
    >
  <DockPanel Name="root">

    <StackPanel  Background="DarkSlateBlue">
      <Button Name="switchAuthor" Click="switchAuthor_click" >
        Switch to student's pen 
      </Button>
      <Button Name="changePenColors" Click="changeColor_click" >
        Change the color of the pen ink
      </Button>
    </StackPanel>
    <InkCanvas Name="inkCanvas1">
    </InkCanvas>
  </DockPanel>
</Window>

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Imports System.Windows.Ink


'/ <summary>
'/ Interaction logic for Window1.xaml
'/ </summary>

Partial Class Window1
    Inherits Window '

    Private authorGuid As New Guid("12345678-9012-3456-7890-123456789012")
    Private teachersDA As New DrawingAttributes()
    Private studentsDA As New DrawingAttributes()
    Private teacher As String = "teacher"
    Private student As String = "student"
    Private useStudentPen As Boolean = False


    Public Sub New()
        InitializeComponent()

        teachersDA.Color = Colors.Red
        teachersDA.Width = 5
        teachersDA.Height = 5
        teachersDA.AddPropertyData(authorGuid, teacher)

        studentsDA.Color = Colors.Blue
        studentsDA.Width = 5
        studentsDA.Height = 5
        studentsDA.AddPropertyData(authorGuid, student)

        inkCanvas1.DefaultDrawingAttributes = teachersDA

    End Sub 'New


    ' Switch between using the 'pen' DrawingAttributes and the 
    ' 'highlighter' DrawingAttributes.
    Private Sub switchAuthor_click(ByVal sender As [Object], ByVal e As RoutedEventArgs)
        useStudentPen = Not useStudentPen

        If useStudentPen Then
            switchAuthor.Content = "Use teacher's pen"
            inkCanvas1.DefaultDrawingAttributes = studentsDA
        Else
            switchAuthor.Content = "Use student's pen"
            inkCanvas1.DefaultDrawingAttributes = teachersDA
        End If

    End Sub 'switchAuthor_click


    ' Change the color of the ink that on the InkCanvas that used the pen.
    Private Sub changeColor_click(ByVal sender As [Object], ByVal e As RoutedEventArgs)
        Dim s As Stroke
        For Each s In inkCanvas1.Strokes
            If s.DrawingAttributes.ContainsPropertyData(authorGuid) Then
                Dim data As Object = s.DrawingAttributes.GetPropertyData(authorGuid)

                If TypeOf data Is String AndAlso CStr(data) = teacher Then
                    s.DrawingAttributes.Color = Colors.Black
                End If
                If TypeOf data Is String AndAlso CStr(data) = student Then
                    s.DrawingAttributes.Color = Colors.Green
                End If
            End If
        Next s

    End Sub 'changeColor_click
End Class 'Window1 

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Ink;

/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>

public partial class Window1 : Window
{
    Guid authorGuid = new Guid("12345678-9012-3456-7890-123456789012");
    DrawingAttributes teachersDA = new DrawingAttributes();
    DrawingAttributes studentsDA = new DrawingAttributes();
    string teacher = "teacher";
    string student = "student";
    bool useStudentPen = false;

    public Window1()
    {
        InitializeComponent();

        teachersDA.Color = Colors.Red;
        teachersDA.Width = 5;
        teachersDA.Height = 5;
        teachersDA.AddPropertyData(authorGuid, teacher);

        studentsDA.Color = Colors.Blue;
        studentsDA.Width = 5;
        studentsDA.Height = 5;
        studentsDA.AddPropertyData(authorGuid, student);

        inkCanvas1.DefaultDrawingAttributes = teachersDA;
    }

    // Switch between using the 'pen' DrawingAttributes and the 
    // 'highlighter' DrawingAttributes.
    void switchAuthor_click(Object sender, RoutedEventArgs e)
    {
        useStudentPen = !useStudentPen;

        if (useStudentPen)
        {
            switchAuthor.Content = "Use teacher's pen";
            inkCanvas1.DefaultDrawingAttributes = studentsDA;
        }
        else
        {
            switchAuthor.Content = "Use student's pen";
            inkCanvas1.DefaultDrawingAttributes = teachersDA;

        }
    }

    // Change the color of the ink that on the InkCanvas that used the pen.
    void changeColor_click(Object sender, RoutedEventArgs e)
    {
        foreach (Stroke s in inkCanvas1.Strokes)
        {
            if (s.DrawingAttributes.ContainsPropertyData(authorGuid))
            {
                object data = s.DrawingAttributes.GetPropertyData(authorGuid);

                if ((data is string) && ((string)data == teacher))
                {
                    s.DrawingAttributes.Color = Colors.Black;
                }
                if ((data is string) && ((string)data == student))
                {
                    s.DrawingAttributes.Color = Colors.Green;
                }
            }
        }
    }
}
  • Last updated on