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首先感谢您的帮助。

这是关于 Componentone 的 True DBGrid,所以这可能不是期待答案的最佳地点,但在这一点上,我觉得我已经尽我所能,所以我愿意试一试。

在过去的几天里,我花了很多时间试图弄清楚如何在 True DBGrid 中创建自定义单元格,但目前我陷入了困境。我已经阅读了尽可能多的文档,并且所有关于 True DBGrid 的教程,但是我能得到的最远的都显示在下面的附图中。

显示一个自定义列的示例

在这里,如果您双击一个单元格,我可以在他们单击的单元格中显示一个自定义控件。但是,我希望单元格始终可见,而不仅仅是在单击它时,而且我希望它基于行本身,而不仅仅是 displayColumn,就像我现在正在重新加载“DisplayColumn.DataColumn.Editor”一样每次单击不同的单元格时。我的此性能代码如下所示。

' Retrieve Column
Dim objPrefDisplayColumn As C1.Win.C1TrueDBGrid.C1DisplayColumn = Me.TestGrid.Splits(0).DisplayColumns("ColumnFieldName")
'Retrieve data from database
Dim data As DataTable = ' My call to database table goes here Retrieve data that relates to row
' Create Custom Controller and Insert Data from table into it
Dim prvNewCellList As New TestCellList
prvNewCellList.LabelButtonHeight = Me.TestGrid.RowHeight / pref.Rows.Count
prvNewCellList.LabelWidth = (objPrefDisplayColumn.Width * 0.9)
prvNewCellList.ButtonWidth = (objPrefDisplayColumn.Width * 0.1)
 prvNewCellList.Action_LoadUI(data)
' Assign Custom Controller to Column
objPrefDisplayColumn.DataColumn.Editor = prvNewCellList
objPrefDisplayColumn.Button = True
objPrefDisplayColumn.ButtonAlways = True
objPrefDisplayColumn.DropDownList = False
objPrefDisplayColumn.DataColumn.DropDown = Nothing

当我查看 DataGridView 的教程时,我知道这应该是可能的,如下面的链接,它们放置在自定义的“DataGridViewTextBoxCell”中,如图所示。

自定义 DataGridViewCells 教程

根据我阅读的有关 TrueDBGrid 的内容,以及 ComponentOne 最有可能使用 DataGridView 作为创建 TrueDBGrid 的模板的预期逻辑,我预计创建自定义单元格的方式会非常相似。但是,在尝试使用 TrueDBGrid 重新创建此示例后,如下所示,我发现列不接受“DataGridViewColumn”,当我尝试将其更改为“C1DataColumn”以满足其期望时,我发现该类与字段没有任何相似之处“ CellTemplate”,可用于创建自定义单元格。在这一点上,我几乎已经准备好相信自定义单元的功能在 TrueDBGrid 的开发过程中被遗忘了,但是,我已经准备好被证明是错误的。

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            Dim col As New DataGridViewRolloverCellColumn()
            Me.TestGrid.Columns.Add(col)
        Catch ex As Exception
            MsgBox("error arrose", vbInformation, "error")
        End Try
    End Sub
End Class

Public Class DataGridViewRolloverCellColumn
    Inherits DataGridViewColumn

    Public Sub New()
        Me.CellTemplate = New DataGridViewRolloverCell()
    End Sub

End Class

Public Class DataGridViewRolloverCell
    Inherits DataGridViewTextBoxCell

    Protected Overrides Sub Paint( _
    ByVal graphics As Graphics, _
    ByVal clipBounds As Rectangle, _
    ByVal cellBounds As Rectangle, _
    ByVal rowIndex As Integer, _
    ByVal elementState 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)

        ' Call the base class method to paint the default cell appearance.
        MyBase.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, _
            value, formattedValue, errorText, cellStyle, _
            advancedBorderStyle, paintParts)

        ' Retrieve the client location of the mouse pointer.
        Dim cursorPosition As Point = _
            Me.DataGridView.PointToClient(Cursor.Position)

        ' If the mouse pointer is over the current cell, draw a custom border.
        If cellBounds.Contains(cursorPosition) Then
            Dim newRect As New Rectangle(cellBounds.X + 1, _
                cellBounds.Y + 1, cellBounds.Width - 4, _
                cellBounds.Height - 4)
            graphics.DrawRectangle(Pens.Red, newRect)
        End If
    End Sub
End Class

再次感谢您的帮助

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1 回答 1

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一段时间后,我找到了解决方法。

以下解决方案对单元格进行了公共控制,并给出了它存在于其中的外观,而实际上它只是存在于它之上。要执行此解决方案,您需要将公共控件添加到网格的控制器,并在每次调用绘制事件时更新公共控件的位置和可见性。

Private Sub LoadGrid()
    ' Create and Load Common control
    Dim prvsdServiceDelivery As ServiceDelTable = New ServiceDelTable()
    prvsdServiceDelivery.Action_LoadUI(DataTable)
    ' Add Common Control to Datastruct so it can be accessed anytime
    Dictionary.put(key, prvsdServiceDelivery)
    ' insert hosted control into grid
    C1TrueDBGrid.Controls.Add(prvptPreferences)
End Sub

Private Sub TestGrid_Paint(sender As Object, e As PaintEventArgs) Handles TestGrid.Paint

    For Each item As KeyValuePair(Of String, prvsdServiceDelivery) In Dictionary
        Try
            Dim prvsdServiceDelivery as ServiceDelTable  = item.Value

            ' get cell rect, may throw error if cell is outside the bounds of table's rectangle
            Dim bnds As Rectangle = frc1tdOwnerTable.Splits(0).GetCellBounds(row,C1TrueDBGrid.Splits(0).DisplayColumns.IndexOf(column))

            ' Set Visibility and move if error isn't thrown
            prvsdServiceDelivery.Bounds = bnds
            prvsdServiceDelivery.Visible = True
        Catch ex As Exception
            ' Set as invisible if exception thrown to say not found
            prvsdServiceDelivery.Visible = False
        End Try
    Next
End Sub
于 2015-01-02T22:51:19.687 回答