按钮列的应用。(在datagrid中加入按钮列,winforms)

王朝system·作者佚名  2006-01-31
窄屏简体版  字體: |||超大  

Public Class mybuttondatagridtablestyle1

Inherits System.Windows.Forms.DataGridTextBoxColumn

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()

MyBase.New()

'该调用是 Windows 窗体设计器所必需的。

InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'UserControl 重写 dispose 以清理组件列表。

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Windows 窗体设计器所必需的

Private components As System.ComponentModel.IContainer

'注意:以下过程是 Windows 窗体设计器所必需的

'可以使用 Windows 窗体设计器修改此过程。

'不要使用代码编辑器修改它。

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

components = New System.ComponentModel.Container()

End Sub

#End Region

Public Delegate Sub DataGridCellButtonClickEventHandler(ByVal sender As Object, ByVal e As DataGridCellButtonClickEventArgs)

Public Event CellButtonClicked As DataGridCellButtonClickEventHandler

Private m_Face As Bitmap

Private m_FacePressed As Bitmap

Private m_columnNum As Integer

Private m_Row As Integer

Public Sub New(ByVal colNum As Integer)

m_columnNum = colNum

m_Row = -1

Try

Dim strm As System.IO.Stream = Me.GetType().Assembly.GetManifestResourceStream("btnface.bmp")

m_Face = New Bitmap(strm)

strm = Me.GetType().Assembly.GetManifestResourceStream("btnpressed.bmp")

m_FacePressed = New Bitmap(strm)

Catch

End Try

End Sub

Protected Overloads Overrides Sub Edit(ByVal [source] As System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer, ByVal bounds As System.Drawing.Rectangle, ByVal [readOnly] As Boolean, ByVal instantText As String, ByVal cellIsVisible As Boolean)

End Sub

Public Sub HandleMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs)

Dim dg As DataGrid = Me.DataGridTableStyle.DataGrid

Dim hti As DataGrid.HitTestInfo = dg.HitTest(New Point(e.X, e.Y))

Dim isClickInCell As Boolean = hti.Column = Me.m_columnNum

m_Row = -1

Dim rect As New Rectangle(0, 0, 0, 0)

If isClickInCell Then

rect = dg.GetCellBounds(hti.Row, hti.Column)

isClickInCell = e.X > rect.Right - Me.m_Face.Width

End If

If isClickInCell Then

Dim g As Graphics = Graphics.FromHwnd(dg.Handle)

g.DrawImage(Me.m_Face, rect.Right - Me.m_Face.Width, rect.Y)

g.Dispose()

RaiseEvent CellButtonClicked(Me, New DataGridCellButtonClickEventArgs(hti.Row, hti.Column))

End If

End Sub

Public Sub HandleMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)

Dim dg As DataGrid = Me.DataGridTableStyle.DataGrid

Dim hti As DataGrid.HitTestInfo = dg.HitTest(New Point(e.X, e.Y))

Dim isClickInCell As Boolean = hti.Column = Me.m_columnNum

Dim rect As New Rectangle(0, 0, 0, 0)

If isClickInCell Then

rect = dg.GetCellBounds(hti.Row, hti.Column)

isClickInCell = e.X > rect.Right - Me.m_Face.Width

End If

If isClickInCell Then

Dim g As Graphics = Graphics.FromHwnd(dg.Handle)

g.DrawImage(Me.m_FacePressed, rect.Right - Me.m_FacePressed.Width, rect.Y)

g.Dispose()

m_Row = hti.Row

End If

End Sub

'重绘

Protected Overloads Overrides Sub Paint(ByVal g As System.Drawing.Graphics, ByVal bounds As System.Drawing.Rectangle, ByVal [source] As System.Windows.Forms.CurrencyManager, ByVal rowNum As Integer, ByVal backBrush As System.Drawing.Brush, ByVal foreBrush As System.Drawing.Brush, ByVal alignToRight As Boolean)

Dim parent As DataGrid = Me.DataGridTableStyle.DataGrid

'如果该行是选中行 或者 当前单元格的行号=点击行的行号并且当前单元格的列号等于NEW的列号参数

Dim current As Boolean = parent.IsSelected(rowNum) Or (parent.CurrentRowIndex = rowNum And parent.CurrentCell.ColumnNumber = Me.m_columnNum)

Dim BackColor As Color

If current Then BackColor = parent.SelectionBackColor Else BackColor = parent.BackColor

Dim ForeColor As Color

If current Then ForeColor = parent.SelectionForeColor Else ForeColor = parent.ForeColor

'请空单元格

g.FillRectangle(New SolidBrush(BackColor), bounds)

' 绘制值

Dim s As String = Me.GetColumnValueAtRow([source], rowNum).ToString() 'parent[rowNum, 0].ToString() + ((parent[rowNum, 1].ToString())+ " ").Substring(0,2);

g.DrawString(s, parent.Font, New SolidBrush(ForeColor), bounds.X, bounds.Y)

Dim bm As Bitmap

If m_Row = rowNum Then bm = Me.m_FacePressed Else bm = Me.m_Face

g.DrawImage(bm, bounds.Right - bm.Width, bounds.Y)

End Sub

End Class

调用代码:

Private Function getdatagridstyle(ByVal table As DataTable) As DataGridTableStyle

Dim style As New DataGridTableStyle()

style.MappingName = table.TableName

style.RowHeaderWidth = 15

Dim i As Integer

For i = 0 To table.Columns.Count - 1

If i = 1 Then

Dim textButtonColStyle As New mybuttondatagridtablestyle1(i) 'pass the column#

textButtonColStyle.HeaderText = table.Columns(i).ColumnName

textButtonColStyle.MappingName = table.Columns(i).ColumnName

'hookup our cellbutton handler...

AddHandler textButtonColStyle.CellButtonClicked, AddressOf HandleCellButtonClick

style.GridColumnStyles.Add(textButtonColStyle)

'hook the mouse handlers

AddHandler DataGrid1.MouseDown, AddressOf textButtonColStyle.HandleMouseDown

AddHandler DataGrid1.MouseUp, AddressOf textButtonColStyle.HandleMouseUp

Else

Dim c As New DataGridTextBoxColumn()

c.HeaderText = table.Columns(i).ColumnName

c.MappingName = table.Columns(i).ColumnName

style.GridColumnStyles.Add(c)

End If

Next

Return style

End Function

Private Sub HandleCellButtonClick(ByVal sender As Object, ByVal e As DataGridCellButtonClickEventArgs)

MessageBox.Show(("row " + e.RowIndex.ToString() + " col " + e.ColIndex.ToString() + " clicked."))

End Sub

 
 
 
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