这段代码演示了在DataGridView中增加一个列显示进度条，在批量上传和下载的时候常用到。
进度条的变化如： DataGridview.row(x).cell(x).value=50
改变他的值就是了。
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代码片段(4)
[代码] [ASP/Basic]代码
001 |
Imports System |
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Imports System.Drawing |
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Imports System.Windows.Forms |
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Public Class DataGridViewPrassBar |
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Public Class DataGridViewProgressBarColumn |
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Inherits DataGridViewTextBoxColumn |
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|
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Public Sub New() |
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Me.CellTemplate = New DataGridViewProgressBarCell() |
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End Sub |
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|
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Public Overrides Property CellTemplate() As DataGridViewCell |
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Get |
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Return MyBase.CellTemplate |
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End Get |
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Set(ByVal value As DataGridViewCell) |
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If Not TypeOf value Is DataGridViewProgressBarCell Then |
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Throw New InvalidCastException("DataGridViewProgressBarCellオブジェクトを" + "指定してください。") |
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End If |
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MyBase.CellTemplate = value |
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End Set |
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|
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End Property |
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|
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|
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|
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Public Property Maximum() As Integer |
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Get |
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Return CType(Me.CellTemplate,DataGridViewProgressBarCell).Maximum |
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End Get |
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Set(ByVal value As Integer) |
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If Me.Maximum = value Then |
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Return |
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End If |
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CType(Me.CellTemplate,DataGridViewProgressBarCell).Maximum = value |
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If Me.DataGridView Is nothing Then |
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Return |
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End If |
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Dim rowCount As Integer = Me.DataGridView.RowCount |
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Dim i As Integer |
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For i = 0 To rowCount - 1 |
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Dim r As DataGridViewRow = Me.DataGridView.Rows.SharedRow(i) |
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CType(r.Cells(Me.Index),DataGridViewProgressBarCell).Maximum = value |
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Next i |
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End Set |
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End Property |
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|
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|
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|
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Public Property Mimimum() As Integer |
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Get |
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Return CType(Me.CellTemplate,DataGridViewProgressBarCell).Mimimum |
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End Get |
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Set(ByVal value As Integer) |
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|
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If Me.Mimimum = value Then |
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|
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Return |
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|
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End If |
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|
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CType(Me.CellTemplate,DataGridViewProgressBarCell).Mimimum = value |
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|
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If Me.DataGridView Is nothing Then |
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|
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Return |
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|
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End If |
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Dim rowCount As Integer = Me.DataGridView.RowCount |
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Dim i As Integer |
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For i = 0 To rowCount - 1 |
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Dim r As DataGridViewRow = Me.DataGridView.Rows.SharedRow(i) |
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CType(r.Cells(Me.Index),DataGridViewProgressBarCell).Mimimum = value |
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Next i |
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End Set |
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End Property |
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|
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End Class |
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|
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|
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|
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Public Class DataGridViewProgressBarCell |
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Inherits DataGridViewTextBoxCell |
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|
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Public Sub New() |
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Me.maximumValue = 100 |
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Me.mimimumValue = 0 |
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End Sub |
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Private maximumValue As Integer |
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|
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Public Property Maximum() As Integer |
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Get |
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Return Me.maximumValue |
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End Get |
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Set(ByVal value As Integer) |
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Me.maximumValue = value |
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End Set |
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End Property |
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|
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|
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|
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Private mimimumValue As Integer |
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|
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Public Property Mimimum() As Integer |
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Get |
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Return Me.mimimumValue |
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End Get |
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Set(ByVal value As Integer) |
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Me.mimimumValue = value |
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End Set |
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End Property |
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|
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|
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|
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Public Overrides ReadOnly Property ValueType() As Type |
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|
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Get |
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|
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Return GetType(Integer) |
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|
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End Get |
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|
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End Property |
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|
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|
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|
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Public Overrides ReadOnly Property DefaultNewRowValue() As Object |
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|
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Get |
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|
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Return 0 |
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|
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End Get |
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|
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End Property |
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|
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|
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|
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Public Overrides Function Clone() As Object |
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Dim cell As DataGridViewProgressBarCell = CType(MyBase.Clone(),DataGridViewProgressBarCell) |
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cell.Maximum = Me.Maximum |
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cell.Mimimum = Me.Mimimum |
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Return cell |
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End Function |
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|
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|
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|
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Protected Overrides Sub Paint(ByVal graphics As Graphics, ByVal clipBounds As Rectangle,ByVal cellBounds As Rectangle,ByVal rowIndex As Integer,ByVal cellState As DataGridViewElementStates,ByVal value As Object,ByVal formattedValue As Object,ByVal errorText As String,ByVal cellStyle As DataGridViewCellStyle, ByVal advancedBorderStyle As DataGridViewAdvancedBorderStyle,ByVal paintParts As DataGridViewPaintParts) |
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Dim intValue As Integer = 0 |
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If TypeOf value Is Integer Then |
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intValue = CInt(value) |
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End If |
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If intValue < Me.mimimumValue Then |
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intValue = Me.mimimumValue |
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End If |
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|
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If intValue > Me.maximumValue Then |
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intValue = Me.maximumValue |
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End If |
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|
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Dim rate As Double = CDbl(intValue - Me.mimimumValue) / (Me.maximumValue - Me.mimimumValue) |
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If (paintParts And DataGridViewPaintParts.Border) = DataGridViewPaintParts.Border Then |
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Me.PaintBorder(graphics,clipBounds,cellBounds,cellStyle,advancedBorderStyle) |
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End If |
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Dim borderRect As Rectangle = Me.BorderWidths(advancedBorderStyle) |
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Dim paintRect As New Rectangle(cellBounds.Left + borderRect.Left,cellBounds.Top + borderRect.Top,cellBounds.Width - borderRect.Right,cellBounds.Height - borderRect.Bottom) |
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Dim isSelected As Boolean = ((cellState And DataGridViewElementStates.Selected) = DataGridViewElementStates.Selected) |
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Dim bkColor As Color |
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If isSelected AndAlso (paintParts And DataGridViewPaintParts.SelectionBackground) = DataGridViewPaintParts.SelectionBackground Then |
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bkColor = cellStyle.SelectionBackColor |
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Else |
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bkColor = cellStyle.BackColor |
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End If |
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If (paintParts And DataGridViewPaintParts.Background) = DataGridViewPaintParts.Background Then |
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Try |
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graphics.FillRectangle(backBrush,paintRect) |
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Finally |
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End Try |
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End If |
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paintRect.Offset(cellStyle.Padding.Right,cellStyle.Padding.Top) |
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paintRect.Width -= cellStyle.Padding.Horizontal |
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paintRect.Height -= cellStyle.Padding.Vertical |
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If (paintParts And DataGridViewPaintParts.ContentForeground) = DataGridViewPaintParts.ContentForeground Then |
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If ProgressBarRenderer.IsSupported Then |
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ProgressBarRenderer.DrawHorizontalBar(graphics,paintRect) |
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Dim barBounds As New Rectangle(paintRect.Left + 3,paintRect.Top + 3,paintRect.Width - 4,paintRect.Height - 6) |
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barBounds.Width = CInt(Math.Round((barBounds.Width * rate))) |
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ProgressBarRenderer.DrawHorizontalChunks(graphics,barBounds) |
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Else |
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graphics.FillRectangle(Brushes.White,paintRect) |
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graphics.DrawRectangle(Pens.Black,paintRect) |
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Dim barBounds As New Rectangle(paintRect.Left + 1,paintRect.Top + 1,paintRect.Width - 1,paintRect.Height - 1) |
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barBounds.Width = CInt(Math.Round((barBounds.Width * rate))) |
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graphics.FillRectangle(Brushes.Blue,barBounds) |
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End If |
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End If |
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If Me.DataGridView.CurrentCellAddress.X = Me.ColumnIndex AndAlso Me.DataGridView.CurrentCellAddress.Y = Me.RowIndex AndAlso (paintParts And DataGridViewPaintParts.Focus) = DataGridViewPaintParts.Focus AndAlso Me.DataGridView.Focused Then |
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Dim focusRect As Rectangle = paintRect |
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focusRect.Inflate(-3,-3) |
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ControlPaint.DrawFocusRectangle(graphics,focusRect) |
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End If |
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If (paintParts And DataGridViewPaintParts.ContentForeground) = DataGridViewPaintParts.ContentForeground Then |
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Dim txt As String = String.Format("{0}%",Math.Round((rate * 100))) |
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Dim flags As textformatFlags = textformatFlags.HorizontalCenter Or textformatFlags.VerticalCenter |
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Dim fColor As Color = cellStyle.ForeColor |
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paintRect.Inflate(-2,-2) |
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TextRenderer.DrawText(graphics,txt,cellStyle.Font,paintRect,fColor,flags) |
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|
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End If |
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If (paintParts And DataGridViewPaintParts.ErrorIcon) = DataGridViewPaintParts.ErrorIcon AndAlso Me.DataGridView.ShowCellErrors AndAlso Not String.IsNullOrEmpty(errorText) Then |
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Dim iconBounds As Rectangle = Me.GetErrorIconBounds(graphics,rowIndex) |
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|
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iconBounds.Offset(cellBounds.X,cellBounds.Y) |
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|
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Me.PaintErrorIcon(graphics,iconBounds,errorText) |
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|
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End If |
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|
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End Sub |
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|
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End Class |
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|
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|
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|
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End Class |
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|
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调用： |
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|
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Dim pbColumn As New DataGridViewPrassBar.DataGridViewProgressBarColumn() |
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pbColumn.DataPropertyName = "Column1" |
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DataGridView1.Columns.Add(pbColumn) |
[图片] 未命名.jpg
[代码] [ASP/Basic]代码
001 |
Imports System |
002 |
Imports System.Drawing |
003 |
Imports System.Windows.Forms |
004 |
Public Class DataGridViewPrassBar |
005 |
Public Class DataGridViewProgressBarColumn |
006 |
Inherits DataGridViewTextBoxColumn |
007 |
|
008 |
Public Sub New() |
009 |
Me.CellTemplate = New DataGridViewProgressBarCell() |
010 |
End Sub |
011 |
|
012 |
Public Overrides Property CellTemplate() As DataGridViewCell |
013 |
Get |
014 |
Return MyBase.CellTemplate |
015 |
End Get |
016 |
Set(ByVal value As DataGridViewCell) |
017 |
If Not TypeOf value Is DataGridViewProgressBarCell Then |
018 |
Throw New InvalidCastException("DataGridViewProgressBarCellオブジェクトを" + "指定してください。") |
019 |
End If |
020 |
MyBase.CellTemplate = value |
021 |
End Set |
022 |
|
023 |
End Property |
024 |
|
025 |
|
026 |
|
027 |
Public Property Maximum() As Integer |
028 |
Get |
029 |
Return CType(Me.CellTemplate,errorText) |
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|
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End If |
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|
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End Sub |
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|
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End Class |
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|
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|
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|
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End Class |
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|
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调用： |
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|
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Dim pbColumn As New DataGridViewPrassBar.DataGridViewProgressBarColumn() |
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pbColumn.DataPropertyName = "Column1" |
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DataGridView1.Columns.Add(pbColumn) |