Silverlight/XAML – Learning by Coding
1: <?xml version="1.0" encoding="UTF-8"?>
2: <!-- coded by Thomas Meinike 12/08 -->
3: <UserControl x:Class="sl2_zip_handling.Page"
4: xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
5: xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
6: Width="800" Height="600" Loaded="LoadZIP">
7:
8: <Canvas x:Name="fotos">
9:
10: <TextBlock Canvas.Left="330" Canvas.Top="15" Foreground="#999"
11: FontFamily="Lucida" FontSize="18" Text="Bilder dynamisch aus einem ZIP-Archiv laden"/>
12:
13: <!-- Fortschrittsbalken -->
14: <Rectangle Canvas.Left="20" Canvas.Top="560" Width="0" Height="25"
15: Stroke="#EEE" StrokeThickness="0.5" RadiusX="12.5" RadiusY="12.5" x:Name="pr_rect">
16: <Rectangle.Fill>
17: <LinearGradientBrush>
18: <GradientStop Color="#DFF" Offset="0.0"/>
19: <GradientStop Color="#7AC" Offset="0.8"/>
20: <GradientStop Color="#589" Offset="1.0"/>
21: </LinearGradientBrush>
22: </Rectangle.Fill>
23: </Rectangle>
24:
25: <!-- Fortschrittswert in Prozent -->
26: <TextBlock Canvas.Left="220" Canvas.Top="564" Width="430" Height="25" Foreground="#00C"
27: FontFamily="Lucida" FontSize="12" Text="%" x:Name="pr_proz"/>
28:
29: </Canvas>
30:
31:
32: <!-- // zusätzlich verwendeter VB.NET-Code in Page.xaml.vb:
33:
34: Imports System.IO
35: Imports System.Net
36: Imports System.Xml.Linq
37: Imports System.Windows.Resources
38: Imports System.Windows.Media.Imaging
39:
40: Partial Public Class Page
41: Inherits UserControl
42:
43: Public Sub New()
44: InitializeComponent()
45: End Sub
46:
47: Private Sub LoadZIP(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
48: Dim wclient As New WebClient
49: Dim address As Uri = New Uri("fotos.zip", UriKind.Relative)
50: AddHandler wclient.OpenReadCompleted, AddressOf OpenReadZIP
51: AddHandler wclient.DownloadProgressChanged, AddressOf DownloadProgress
52: wclient.OpenReadAsync(address)
53: End Sub
54:
55: Private Sub DownloadProgress(ByVal sender As Object, ByVal e As DownloadProgressChangedEventArgs)
56: Dim pr As Double = Math.Floor(e.ProgressPercentage)
57: pr_rect.Width = pr * 4.3 'maximale Rechteck-Breite: 430
58: pr_proz.Text = pr.ToString() + "%"
59: End Sub
60:
61: Private Sub OpenReadZIP(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)
62: If e.Error Is Nothing Then
63: Try
64: 'ZIP-Inhalt verarbeiten (files.xml und foto_01.png bis foto_04.png)
65: Dim zip_stream As Stream = e.Result
66: Dim stream_source As StreamResourceInfo = New StreamResourceInfo(zip_stream, Nothing)
67: Dim xmlSourceInfo As StreamResourceInfo = _
68: Application.GetResourceStream(stream_source, New Uri("files.xml", UriKind.Relative))
69:
70: 'Bildnamen aus XML-File lesen und Bildressourcen zuweisen
71: Dim xmldoc = XElement.Load(xmlSourceInfo.Stream)
72: Dim i As Integer = 0
73:
74: For Each file In xmldoc.Descendants("file")
75: Dim img_filename As String = file.FirstNode.ToString() 'Bildname aus XML-File
76: 'Bildinhalte verarbeiten
77: Dim image_source As StreamResourceInfo = _
78: Application.GetResourceStream(stream_source, New Uri(img_filename, UriKind.Relative))
79: Dim bitmap As New BitmapImage
80: bitmap.SetSource(image_source.Stream)
81:
82: Dim img_brush As ImageBrush = New ImageBrush
83: img_brush.ImageSource = bitmap
84:
85: 'Rechteck mit abgerundeten Ecken und Bild als Füllung erzeugen
86: Dim xaml_rect As String = _
87: "<Rectangle xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' " _
88: + "Canvas.Left='" + (20 + i * 150).ToString() + "' Canvas.Top='" + (20 + i * 125).ToString() + "' " _
89: + "Width='250' Height='187' RadiusX='15' RadiusY='15'/>"
90:
91: Dim rectangle = DirectCast(System.Windows.Markup.XamlReader.Load(xaml_rect), Rectangle)
92: rectangle.Fill = img_brush
93:
94: fotos.Children.Add(rectangle)
95: i = i + 1
96: Next
97:
98: Catch ex As Exception
99: pr_proz.Foreground = New SolidColorBrush(Colors.Red)
100: pr_proz.Text = "Fehler beim Laden!"
101: End Try
102: End If
103: End Sub
104:
105: End Class
106:
107: -->
108:
109:
110: <!-- // zusätzlich verwendeter XML-Code in files.xml als Teil von fotos.zip:
111:
112: <?xml version="1.0" encoding="UTF-8"?>
113: <files info="Bilddateien in fotos.zip">
114: <file>foto_01.png</file>
115: <file>foto_02.png</file>
116: <file>foto_03.png</file>
117: <file>foto_04.png</file>
118: </files>
119:
120: -->
121:
122: </UserControl>
[zum Anfang]
