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| Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Threading
Imports System.Xml
Namespace DodgerCodeSnippets
''' <summary>
''' Description résumée de FormMain.
''' </summary>
Public Class FormMain
Inherits System.Windows.Forms.Form
Private lst As New List(Of String)
Private offScreenBitmap As Bitmap
Private offScreenGraphics As Graphics
' Représenta la zone dans laquelle on dessine les items
Private onScreenGraphics As Graphics
' Représenta la zone réellement affichée
Private m_bSelectionDone As Boolean = False
Private m_iScreenWidth As Integer = 480
' Taille de l'écran
Private m_iScreenHeight As Integer = 588
Private m_iItemsCount As Integer = Nothing
' Nombre d'Item dans la liste
Private m_iItemheight As Integer = 80
' auteur d'un item
Private m_iStripWidth As Integer = 480
Private m_iStripHeight As Integer = 588
' Hauteur totale de la liste
Private m_iStripPosY As Integer = 1
Private m_iOldStripPosY As Integer = -10
Private m_iMoveStep As Integer = 1
' Déplacement en nombre de pixels à chaque boucle
Private m_iSens As Integer = 0
' 0,+1,-1
Private m_iTouchStartY As Integer = 0
' Position en pixel de l'endroit où l'on a posé le doigt
Private m_iTouchEndY As Integer = 0
' Position en pixel de l'endroit où l'on a relevé le doigt
Private m_iSelectedIndexItem As Integer = -1
' Numéro de l'Item sélectionné
Private m_iPixelPerScroll As Integer = 0
' De combien de pixel doit on scrollé après un mouvement de doigt sur l'écran
Private m_iSleep As Integer = 3
' nombre de milliseconde d'attente dans la boucle
Public Shared OddCellBackGroundColor As System.Drawing.Color = System.Drawing.Color.Transparent
Public Shared EvenCellBackGroundColor As System.Drawing.Color = System.Drawing.Color.Transparent
Public Shared SelectedCellBackGroundColor As System.Drawing.Color = System.Drawing.Color.Transparent
Public Shared CellBorderColor As System.Drawing.Color = System.Drawing.Color.LightGray
Public Sub New()
parsexml()
m_iItemsCount = lst.Count
InitScreens()
DoLoop()
End Sub
Private Sub InitScreens()
Me.Visible = True
Me.WindowState = FormWindowState.Normal
m_iStripHeight = m_iItemsCount * m_iItemheight
' Creation d'un ecran virtuel plus grand que l'écran du PDA qui contient toute la liste
offScreenBitmap = New Bitmap(m_iStripWidth, m_iStripHeight)
offScreenGraphics = Graphics.FromImage(offScreenBitmap)
offScreenGraphics.Clear(Color.Black)
onScreenGraphics = Me.CreateGraphics()
End Sub
Private Sub DoLoop()
' C'est ici que l'on dessine les Items
For iItem As Integer = 0 To m_iItemsCount - 1
DrawItem(iItem)
Next iItem
onScreenGraphics.Clear(Color.Black)
onScreenGraphics.DrawImage(offScreenBitmap, 0, 0, New Rectangle(0, 0, 480, 588), GraphicsUnit.Pixel)
Application.DoEvents()
Render()
onScreenGraphics.Dispose()
Application.DoEvents()
MessageBox.Show("Vous avez sélectionné l'item : " + m_iSelectedIndexItem, "Info")
Application.[Exit]()
End Sub
''' <summary>
''' Nettoyage des ressources utilisées.
''' </summary>
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
MyBase.Dispose(disposing)
End Sub
''' <summary>
''' Point d'entrée principal de l'application.
''' </summary>
Public Shared Sub Main()
Application.Run(New FormMain())
End Sub
''' <summary>
''' Boucle principale de rendu de la liste
''' </summary>
Protected Overridable Sub Render()
' distance parcourrue en pixel depuis le dernier mouvement de doigt
Dim iPixelScrollCount As Integer = 0
While Not m_bSelectionDone
Try
' On bloque le scroll quand on arrive en bas
If (m_iSens = 1) AndAlso (m_iStripPosY + m_iScreenHeight >= m_iStripHeight) Then
m_iSens = 0
iPixelScrollCount = 0
End If
' On bloque le scroll quand on arrive en haut
If (m_iSens = -1) AndAlso (m_iStripPosY <= 0) Then
m_iSens = 0
iPixelScrollCount = 0
End If
If m_iSens <> 0 Then
iPixelScrollCount += 1
m_iStripPosY += m_iMoveStep * m_iSens
End If
' Si on a scrollé du nombre de pixel que l'on souhaitait
' On s'arrete
If iPixelScrollCount > m_iPixelPerScroll Then
m_iSens = 0
iPixelScrollCount = 0
End If
' Si on a pas bougé, inutile de re-dessiner
If m_iOldStripPosY <> m_iStripPosY Then
onScreenGraphics.DrawImage(offScreenBitmap, 0, 0, New Rectangle(0, m_iStripPosY, 480, 588), GraphicsUnit.Pixel)
m_iOldStripPosY = m_iStripPosY
End If
Application.DoEvents()
' On laisse le temps au PDA de souffler
' On ralentit quelque peu le scrolling
Thread.Sleep(m_iSleep)
Catch exp As Exception
MessageBox.Show("Oups il y a un problème dans Render :" + exp.ToString())
End Try
End While
End Sub
''' <summary>
''' Dessine un Item ( élément ) de la liste à la position indiquée
''' </summary>
''' <param name="iIndex"></param>
Private Sub DrawItem(ByVal iIndex As Integer)
Dim font As Font
Dim text As String
Dim blackBrush As Brush = New SolidBrush(Color.Black)
Dim brushOdd As Brush = New SolidBrush(OddCellBackGroundColor)
Dim brushEven As Brush = New SolidBrush(EvenCellBackGroundColor)
Dim brush As Brush = Nothing
font = New Font(FontFamily.GenericSansSerif, 5, FontStyle.Bold)
Dim pen As New Pen(CellBorderColor)
' On intervertit les couleurs pour donner un coté sympa
If (iIndex Mod 2) = 0 Then
brush = brushOdd
Else
brush = brushEven
End If
offScreenGraphics.FillRectangle(brush, 0, iIndex * m_iItemheight, m_iScreenWidth - 1, m_iItemheight)
offScreenGraphics.DrawRectangle(pen, 0, iIndex * m_iItemheight, m_iScreenWidth, m_iItemheight)
' C'est ici que vous insérez le texte que vous souhaitez
text = lst.Item(iIndex)
offScreenGraphics.DrawString(text, font, blackBrush, 10, (iIndex * m_iItemheight) + 10)
End Sub
''' <summary>
''' Dessine un Item sélectionné à la position indiquée
''' </summary>
''' <param name="iIndex"></param>
Private Sub DrawSelectedItem(ByVal iIndex As Integer)
Dim text As String
Dim font As Font
Dim pen As New Pen(CellBorderColor)
Dim blackBrush As Brush = New SolidBrush(Color.Black)
font = New Font(FontFamily.GenericSansSerif, 5, FontStyle.Bold)
' On dessine le rectangle plein
offScreenGraphics.FillRectangle(New SolidBrush(SelectedCellBackGroundColor), 0, iIndex * m_iItemheight, m_iScreenWidth - 1, m_iItemheight)
' avec un petit contour gris
offScreenGraphics.DrawRectangle(pen, 0, iIndex * m_iItemheight, m_iScreenWidth, m_iItemheight)
text = lst.Item(iIndex)
' On affiche le texte
offScreenGraphics.DrawString(text, font, blackBrush, 10, (iIndex * m_iItemheight) + 10)
m_iOldStripPosY = -1
' Force à redessiner ( voir méthode Render() )
End Sub
' Gestion du scroll au doigt et à l'oeuil ... heu non au stylet !
Private Sub FormMain_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
m_iTouchEndY = e.Y
If m_iSens = 0 Then
If m_iTouchStartY - m_iTouchEndY > 0 Then
m_iSens = 1
Else
m_iSens = -1
End If
Dim iDelta As Integer = Math.Abs(m_iTouchStartY - m_iTouchEndY)
' Plus le doigt a glissé sur une grande distance,
' plus on scroll loin
If iDelta > 160 Then
m_iPixelPerScroll = 588
m_iSleep = 0
ElseIf (iDelta > 100) AndAlso (iDelta < 160) Then
m_iPixelPerScroll = 294
m_iSleep = 2
ElseIf (iDelta < 100) AndAlso (iDelta > 20) Then
m_iPixelPerScroll = 147
m_iSleep = 4
Else
' On commence par effacer le précédent item sélectionné si il existe
Dim iPreviousSelectionIndex As Integer = m_iSelectedIndexItem
If m_iSelectedIndexItem > -1 Then
DrawItem(iPreviousSelectionIndex)
End If
m_iSens = 0
m_iSelectedIndexItem = (m_iStripPosY + m_iTouchEndY) / m_iItemheight
DrawSelectedItem(m_iSelectedIndexItem)
If iPreviousSelectionIndex = m_iSelectedIndexItem Then
m_bSelectionDone = True
End If
End If
m_iTouchStartY = 0
m_iTouchEndY = 0
Else
' si on touche l'écran pendant le scroll, ça l'arrete
m_iSens = 0
End If
End Sub
Private Sub FormMain_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown
m_iTouchStartY = e.Y
End Sub
Private Sub InitializeComponent()
Me.SuspendLayout()
'
'FormMain
'
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Inherit
Me.ClientSize = New System.Drawing.Size(480, 588)
Me.Location = New System.Drawing.Point(0, 52)
Me.Name = "FormMain"
Me.Text = "iListBox"
Me.ResumeLayout(False)
End Sub
Public Function parsexml() As String
Dim m_xmlr As XmlTextReader
'Create the XML Reader
m_xmlr = New XmlTextReader("http://yp.shoutcast.com/sbin/newxml.phtml")
'Disable whitespace so that you don't have to read over whitespaces
m_xmlr.WhitespaceHandling = WhitespaceHandling.None
'read the xml declaration and advance to family tag
m_xmlr.Read()
'read the family tag
m_xmlr.Read()
'Load the Loop
While Not m_xmlr.EOF
'Go to the name tag
m_xmlr.Read()
'if not start element exit while loop
If Not m_xmlr.IsStartElement() Then
Exit While
End If
'Get the Gender Attribute Value
Dim nameAttribute As String = m_xmlr.GetAttribute("name")
'Read elements firstname and lastname
m_xmlr.Read()
lst.Add(nameAttribute)
End While
'close the reader
m_xmlr.Close()
End Function
End Class
End Namespace |
