承载 ComboBox 控件的 DataGridColumnStyle (VB.NET)
重写ComboBox类
Imports System.Windows.Forms
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Public Class AutoCompleteComboBox
Inherits ComboBox
Public Sub New()
MyBase.New()
End Sub
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Private mResetOnClear As Boolean = False
Protected Overrides Sub RefreshItem(ByVal index As Integer)
MyBase.RefreshItem(index)
End Sub
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Protected Overrides Sub SetItemsCore(ByVal items As System.Collections.IList)
MyBase.SetItemsCore(items)
End Sub
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Public Shadows Sub KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
Dim intIndex As Integer
Dim strEntry As String
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If Char.IsControl(e.KeyChar) Then
If MyBase.SelectionStart <= 1 Then
If mResetOnClear Then
MyBase.SelectedIndex = 0
MyBase.SelectAll()
Else
MyBase.Text = String.Empty
MyBase.SelectedIndex = -1
End If
e.Handled = True
Exit Sub
End If
If MyBase.SelectionLength = 0 Then
strEntry = MyBase.Text.Substring(0, MyBase.Text.Length - 1)
Else
strEntry = MyBase.Text.Substring(0, MyBase.SelectionStart - 1)
End If
ElseIf (Not Char.IsLetterOrDigit(e.KeyChar)) And (Not Char.IsWhiteSpace(e.KeyChar)) Then '< 32 Or KeyAscii > 127 Then
Exit Sub
Else
If MyBase.SelectionLength = 0 Then
strEntry = UCase(MyBase.Text & e.KeyChar)
Else
strEntry = MyBase.Text.Substring(0, MyBase.SelectionStart) & e.KeyChar
End If
End If
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MyBase.DroppedDown = Char.IsLetterOrDigit(e.KeyChar)
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intIndex = MyBase.FindString(strEntry)
If intIndex <> -1 Then
MyBase.SelectedIndex = intIndex
MyBase.SelectionStart = strEntry.Length
MyBase.SelectionLength = MyBase.Text.Length - MyBase.SelectionStart
End If
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e.Handled = True
Exit Sub
End Sub
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Public Property ResetOnClear() As Boolean
Get
Return mResetOnClear
End Get
Set(ByVal Value As Boolean)
mResetOnClear = Value
End Set
End Property
End Class
实现类
Option Strict On
Option Explicit On
Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Data
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Public Class DataGridComboBox
Inherits AutoCompleteComboBox
Public Sub New()
MyBase.New()
End Sub
Public isInEditOrNavigateMode As Boolean = True
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End Class
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Public Class DataGridComboBoxColumnStyle
Inherits DataGridColumnStyle
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Private xMargin As Integer = 2
Private yMargin As Integer = 1
Private Combo As DataGridComboBox
Private _DisplayMember As String
Private _ValueMember As String
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Private OldVal As String = String.Empty
Private InEdit As Boolean = False
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Public Sub New(ByRef DataSource As DataTable, _
ByVal DisplayMember As Integer, _
ByVal ValueMember As Integer)
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Combo = New DataGridComboBox
_DisplayMember = DataSource.Columns.Item(index:=DisplayMember).ToString
_ValueMember = DataSource.Columns.Item(index:=ValueMember).ToString
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With Combo
.Visible = False
.DataSource = DataSource
.DisplayMember = _DisplayMember
.ValueMember = _ValueMember
End With
End Sub
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Public Sub New(ByRef DataSource As DataTable, _
ByVal DisplayMember As String, _
ByVal ValueMember As String)
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Combo = New DataGridComboBox
With Combo
.Visible = False
.DataSource = DataSource
.DisplayMember = DisplayMember
.ValueMember = ValueMember
End With
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End Sub
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Protected Overloads Overrides Sub Abort(ByVal RowNum As Integer)
Debug.WriteLine("Abort()")
RollBack()
HideComboBox()
EndEdit()
End Sub
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Protected Overloads Overrides Function Commit(ByVal DataSource As CurrencyManager, _
ByVal RowNum As Integer) As Boolean
HideComboBox()
If Not InEdit Then
Return True
End If
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Try
Dim Value As Object = Combo.SelectedValue
If NullText.Equals(Value) Then
Value = Convert.DBNull
End If
SetColumnValueAtRow(DataSource, RowNum, Value)
Catch e As Exception
RollBack()
Return False
End Try
EndEdit()
Return True
End Function
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Protected Overloads Overrides Sub ConcedeFocus()
Combo.Visible = False
End Sub
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Protected Overloads Overrides Sub Edit(ByVal Source As CurrencyManager, _
ByVal Rownum As Integer, _
ByVal Bounds As Rectangle, _
ByVal [ReadOnly] As Boolean, _
ByVal InstantText As String, _
ByVal CellIsVisible As Boolean)
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Combo.Text = String.Empty
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Dim OriginalBounds As Rectangle = Bounds
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OldVal = Combo.Text
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If CellIsVisible Then
Bounds.Offset(xMargin, yMargin)
Bounds.Width -= xMargin * 2
Bounds.Height -= yMargin
Combo.Bounds = Bounds
Combo.Visible = True
Else
Combo.Bounds = OriginalBounds
Combo.Visible = False
End If
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Combo.SelectedValue = GetText(GetColumnValueAtRow(Source, Rownum))
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If Not InstantText Is Nothing Then
Combo.SelectedValue = InstantText
End If
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Combo.RightToLeft = Me.DataGridTableStyle.DataGrid.RightToLeft
Combo.Focus()
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If InstantText Is Nothing Then
Combo.SelectAll()
Else
Dim [End] As Integer = Combo.Text.Length
Combo.Select([End], 0)
End If
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If Combo.Visible Then
DataGridTableStyle.DataGrid.Invalidate(OriginalBounds)
End If
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InEdit = True
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End Sub
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Protected Overloads Overrides Function GetMinimumHeight() As Integer
Return Combo.PreferredHeight + yMargin
End Function
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Protected Overloads Overrides Function GetPreferredHeight(ByVal g As Graphics, _
ByVal Value As Object) As Integer
Debug.WriteLine("GetPreferredHeight()")
Dim NewLineIndex As Integer = 0
Dim NewLines As Integer = 0
Dim ValueString As String = Me.GetText(Value)
Do
While NewLineIndex <> -1
NewLineIndex = ValueString.IndexOf("r\n", NewLineIndex + 1)
NewLines += 1
End While
Loop
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Return FontHeight * NewLines + yMargin
End Function
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Protected Overloads Overrides Function GetPreferredSize(ByVal g As Graphics, _
ByVal Value As Object) As Size
Dim Extents As Size = Size.Ceiling(g.MeasureString(GetText(Value), _
Me.DataGridTableStyle.DataGrid.Font))
Extents.Width += xMargin * 2 + DataGridTableGridLineWidth
Extents.Height += yMargin
Return Extents
End Function
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Protected Overloads Overrides Sub Paint(ByVal g As Graphics, _
ByVal Bounds As Rectangle, _
ByVal Source As CurrencyManager, _
ByVal RowNum As Integer)
Paint(g, Bounds, Source, RowNum, False)
End Sub
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Protected Overloads Overrides Sub Paint(ByVal g As Graphics, _
ByVal Bounds As Rectangle, _
ByVal Source As CurrencyManager, _
ByVal RowNum As Integer, _
ByVal AlignToRight As Boolean)
Dim Text As String = GetText(GetColumnValueAtRow(Source, RowNum))
PaintText(g, Bounds, Text, AlignToRight)
End Sub
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Protected Overloads Sub Paint(ByVal g As Graphics, _
ByVal Bounds As Rectangle, _
ByVal Source As CurrencyManager, _
ByVal RowNum As Integer, _
ByVal BackBrush As Brush, _
ByVal ForeBrush As Brush, _
ByVal AlignToRight As Boolean)
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Dim Text As String = GetText(GetColumnValueAtRow(Source, RowNum))
PaintText(g, Bounds, Text, BackBrush, ForeBrush, AlignToRight)
End Sub
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Protected Overloads Overrides Sub SetDataGridInColumn(ByVal Value As DataGrid)
MyBase.SetDataGridInColumn(Value)
If Not (Combo.Parent Is Value) Then
If Not (Combo.Parent Is Nothing) Then
Combo.Parent.Controls.Remove(Combo)
End If
End If
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If Not (Value Is Nothing) Then Value.Controls.Add(Combo)
End Sub
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Protected Overloads Overrides Sub UpdateUI(ByVal Source As CurrencyManager, _
ByVal RowNum As Integer, ByVal InstantText As String)
Combo.Text = GetText(GetColumnValueAtRow(Source, RowNum))
If Not (InstantText Is Nothing) Then
Combo.Text = InstantText
End If
End Sub
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Private ReadOnly Property DataGridTableGridLineWidth() As Integer
Get
If Me.DataGridTableStyle.GridLineStyle = DataGridLineStyle.Solid Then
Return 1
Else
Return 0
End If
End Get
End Property
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Private Sub EndEdit()
InEdit = False
Invalidate()
End Sub
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Private Function GetText(ByVal Value As Object) As String
If Value Is System.DBNull.Value Then Return NullText
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If Not Value Is Nothing Then
Return Value.ToString
Else
Return String.Empty
End If
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End Function
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Private Sub HideComboBox()
If Combo.Focused Then
Me.DataGridTableStyle.DataGrid.Focus()
End If
Combo.Visible = False
End Sub
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Private Sub RollBack()
Combo.Text = OldVal
End Sub
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Private Sub PaintText(ByVal g As Graphics, _
ByVal Bounds As Rectangle, _
ByVal Text As String, _
ByVal AlignToRight As Boolean)
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Dim BackBrush As Brush = New SolidBrush(Me.DataGridTableStyle.BackColor)
Dim ForeBrush As Brush = New SolidBrush(Me.DataGridTableStyle.ForeColor)
PaintText(g, Bounds, Text, BackBrush, ForeBrush, AlignToRight)
End Sub
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Private Sub PaintText(ByVal g As Graphics, _
ByVal TextBounds As Rectangle, _
ByVal Text As String, _
ByVal BackBrush As Brush, _
ByVal ForeBrush As Brush, _
ByVal AlignToRight As Boolean)
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Dim Rect As Rectangle = TextBounds
Dim RectF As RectangleF = RectF.op_Implicit(Rect) ' Convert to RectangleF
Dim Format As StringFormat = New StringFormat
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If AlignToRight Then
Format.FormatFlags = StringFormatFlags.DirectionRightToLeft
End If
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Select Case Me.Alignment
Case Is = HorizontalAlignment.Left
Format.Alignment = StringAlignment.Near
Case Is = HorizontalAlignment.Right
Format.Alignment = StringAlignment.Far
Case Is = HorizontalAlignment.Center
Format.Alignment = StringAlignment.Center
End Select
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Format.FormatFlags = Format.FormatFlags Or StringFormatFlags.NoWrap
g.FillRectangle(Brush:=BackBrush, Rect:=Rect)
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Rect.Offset(0, yMargin)
Rect.Height -= yMargin
g.DrawString(Text, Me.DataGridTableStyle.DataGrid.Font, ForeBrush, RectF, Format)
Format.Dispose()
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End Sub
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Public ReadOnly Property ComboBox() As ComboBox
Get
Return Combo
End Get
End Property
End Class
测试代码
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitForm(DataGrid1)
Dim namesDataTable As DataTable
namesDataTable = New DataTable("NamesTable")
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namesDataTable.Columns.Add("Name", GetType(String))
namesDataTable.Columns.Add("Sex", GetType(String))
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Dim namesDataSet As DataSet = New DataSet
namesDataSet.Tables.Add(namesDataTable)
DataGrid1.DataSource = namesDataSet
DataGrid1.DataMember = "NamesTable"
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AddGridStyle(DataGrid1)
AddData(namesDataTable)
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End Sub
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Private Sub AddGridStyle(ByRef myGrid As DataGrid)
Dim myGridStyle As DataGridTableStyle = New DataGridTableStyle
myGridStyle.MappingName = "NamesTable"
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Dim nameColumnStyle As DataGridTextBoxColumn = New DataGridTextBoxColumn
nameColumnStyle.MappingName = "Name"
nameColumnStyle.HeaderText = "Name"
myGridStyle.GridColumnStyles.Add(nameColumnStyle)
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Dim mydt As DataTable
mydt = New DataTable
mydt.Columns.Add("id", GetType(String))
mydt.Columns.Add("text", GetType(String))
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Dim newRowW As DataRow
newRowW = mydt.NewRow()
newRowW(0) = "0"
newRowW(1) = "女"
Dim newRowM As DataRow
newRowM = mydt.NewRow()
newRowM(0) = "1"
newRowM(1) = "男"
mydt.Rows.Add(newRowM)
mydt.Rows.Add(newRowW)
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Dim comboxColumnStyle As New DataGridComboBoxColumnStyle(mydt, 1, 1)
comboxColumnStyle.MappingName = "Sex"
comboxColumnStyle.HeaderText = "Sex"
comboxColumnStyle.Width = 100
myGridStyle.GridColumnStyles.Add(comboxColumnStyle)
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myGrid.TableStyles.Add(myGridStyle)
End Sub
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Private Sub AddData(ByRef namesDataTable As DataTable)
Dim dRow As DataRow = namesDataTable.NewRow()
dRow("Name") = "小站"
dRow("Sex") = "女"
namesDataTable.Rows.Add(dRow)
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dRow = namesDataTable.NewRow()
dRow("Name") = "小李"
dRow("Sex") = "男"
namesDataTable.Rows.Add(dRow)
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dRow = namesDataTable.NewRow()
dRow("Name") = "小吴"
dRow("Sex") = "女"
namesDataTable.Rows.Add(dRow)
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namesDataTable.AcceptChanges()
End Sub
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Private Sub InitForm(ByRef myGrid As DataGrid)
myGrid.TabStop = True
myGrid.TabIndex = 1
End Sub
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