Hi,
Sure you can use hit test info for a data grid in the column style.
Here is a sample column that i wrote that high lights the column the mouse
is under. I hope this helps.
Public Class HotTrackTextBoxColumn
Inherits DataGridTextBoxColumn
Dim c As Integer
Dim rectPaint As New RectangleF
Dim fnt As New Font(MyBase.TextBox.Font.Name, MyBase.TextBox.Font.Size,
FontStyle.Underline)
Dim WithEvents dg As DataGrid
Dim oldCell As New Point(-1, -1)
Dim isInCell As Boolean = False
Public Sub HandleMouseMove(ByVal sender As Object, ByVal e As
MouseEventArgs) Handles dg.MouseMove
Dim g As Graphics = dg.CreateGraphics
Dim bounds As Rectangle
Dim hti As DataGrid.HitTestInfo = dg.HitTest(New Point(e.X, e.Y))
isInCell = (hti.Row > -1 And hti.Column = c)
Static bRedraw As Boolean = False
If isInCell Then
Dim pt As Point
pt = New Point(hti.Row, hti.Column)
If Not pt.Equals(oldCell) Then
'
' Create a region where we want the datagrid to redraw
' So the datagrid doesn't flash.
'
Dim pthToRedraw As New Drawing2D.GraphicsPath
Dim rgnToRedraw As Region
Dim rCell As Rectangle = dg.GetCellBounds(pt.X, pt.Y)
pthToRedraw.AddRectangle(rCell)
If oldCell.X > -1 Then
'
' Have to redraw last cell
'
pthToRedraw.AddRectangle(dg.GetCellBounds(oldCell. X, oldCell.Y))
End If
rgnToRedraw = New Region(pthToRedraw)
dg.Invalidate(rgnToRedraw)
End If
'
' Flag datagrid for redraw
'
bRedraw = True
oldCell = pt
Else
'
' Only redraw when needed
'
If bRedraw Then
dg.Invalidate(dg.GetCellBounds(oldCell.X, oldCell.Y))
End If
bRedraw = False
oldCell = New Point(-1, -1)
End If
End Sub
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)
Static bPainted As Boolean = False
'
' First time we paint get a reference to datagrid
' So we can consume its events
'
If Not bPainted Then
dg = Me.DataGridTableStyle.DataGrid
c = -1
For Each grdCol As DataGridColumnStyle In
Me.DataGridTableStyle.GridColumnStyles
c += 1
If grdCol.MappingName = Me.MappingName Then Exit For
Next
End If
Dim pt As New Point(rowNum, c)
bPainted = True
MyBase.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight)
Dim brHot As New SolidBrush(Color.FromArgb(128, SystemColors.HotTrack))
If MouseOverCell(rowNum) Then
bounds.Inflate(-1, -1)
g.FillRectangle(brHot, bounds)
g.DrawRectangle(Pens.Blue, bounds)
End If
Dim r As New RectangleF(bounds.X, bounds.Y, bounds.Width, bounds.Height)
rectPaint = r
End Sub
Public ReadOnly Property MouseOverCell(ByVal rownum As Integer) As Boolean
Get
Dim pt As New Point(rownum, c)
Trace.WriteLine(String.Format("{0} {1}", oldCell.ToString, pt.ToString))
Return pt.Equals(oldCell)
End Get
End Property
End Class
Ken
-------------------------
"Anthony" <an*****@sysdel.com.au> wrote in message
news:eR**************@TK2MSFTNGP12.phx.gbl...
Hi Folks,
I'm adding some columns to my datagrid which are of Combo Box type. I'm
inheriting DataGridTextBoxColumn and doing all the usual stuff to get them
populated. This is working fine. I have added some functionality where if
the user right clicks the combobox a context menu will appear, saying "Fill
the complete column with value 'XXX'". This value is the value they selected
from the combobox. This is also working fine.
However, to get this working generically for any datagrid, I'm running into
problems. I overload the constructor to pass in the datagrid (by ref) and
datatable, but I need to know the column the user clicked which I'm not
really sure how to do this.
I had this working before for one particular datagrid in my app. I passed in
a reference to the class containing the datagrid when the columns were
created but I'm trying to make it generic now so any datagrid can uses this
context menu function.
The reason I need to know the column selected is when I loop thru all the
rows and columns I know which cell to update.
I'm still fairly green with vb.net (win), ...do I need to get an event to
fire off, ..or add a addhandler to the constructor? The problem is I can't
do the HitTest for the datagrid within the "DataGridComboBoxColumn" class.
Again : I need to know the column the user clicked on the datagrid.
Hope I've explained this well enough. Any help would really be appreciated,
cause this one has got me for days.
Thanks,
Anthony
