I wrote the helper class below to animate images in a DataGridView , but it is not working (images are not animated).
Before that, I found some example codes in google, but they did not work either.
How would I like to understand how this works instead of simply putting a piece of code inside my application simply because it works, I would be grateful if someone could help me understand why my code is not performing the expected work. >
Thank you.
Public Class DataGridViewImageAnimator
Private WithEvents MyDataGridView As DataGridView
Public Sub New(dataGridView As DataGridView)
MyDataGridView = dataGridView
End Sub
Private MyAnimatedImages As New Dictionary(Of Point, Image)
Private Sub ImageAnimator_FrameChanged(sender As Object, e As EventArgs)
Dim imageCells = MyDataGridView.Rows.Cast(Of DataGridViewRow).SelectMany(
Function(dgvr) dgvr.Cells.OfType(Of DataGridViewImageCell))
For Each cell In imageCells
Dim img = TryCast(cell.FormattedValue, Image)
If img IsNot Nothing AndAlso MyAnimatedImages.ContainsValue(img) Then
MyDataGridView.InvalidateCell(cell)
End If
Next
End Sub
Private Sub MyDataGridView_CellPainting(
sender As Object,
e As DataGridViewCellPaintingEventArgs
) Handles MyDataGridView.CellPainting
If e.ColumnIndex >= 0 AndAlso e.RowIndex >= 0 Then
Dim cell = MyDataGridView(e.ColumnIndex, e.RowIndex)
Dim drawPoint = MyDataGridView.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, True).Location
Dim pt = New Point(e.ColumnIndex, e.RowIndex)
Dim cellImg = TryCast(cell.FormattedValue, Image)
If MyAnimatedImages.ContainsKey(pt) AndAlso Equals(MyAnimatedImages(pt), cellImg) Then
'Se a imagem já está registrada como animada, e ainda está na célula
ImageAnimator.UpdateFrames()
e.Graphics.DrawImage(cellImg, drawPoint)
Else
If MyAnimatedImages.ContainsKey(pt) Then
'Se a imagem registrada como animada não está mais na célula
ImageAnimator.StopAnimate(MyAnimatedImages(pt), AddressOf ImageAnimator_FrameChanged)
MyAnimatedImages.Remove(pt)
End If
If cellImg IsNot Nothing AndAlso ImageAnimator.CanAnimate(cellImg) Then
'Se a célula contém uma imagem que ainda não está registrada como animada
MyAnimatedImages(pt) = cellImg
ImageAnimator.Animate(MyAnimatedImages(pt), AddressOf ImageAnimator_FrameChanged)
ImageAnimator.UpdateFrames()
e.Graphics.DrawImage(cellImg, drawPoint)
End If
End If
End If
End Sub
End Class