Shamil Salakhetdinov
shamil at smsconsulting.spb.ru
Wed Dec 1 09:00:47 CST 2010
Hi Gustav --
Thank you. Yes, that should help. I must note I didn't google for that
somehow - just for RowPostPaint event.
It looks simple now - just information how to draw on left-top cell is
missing.
You're so quick with googling could you find that information? :) (If you'll
not find it quickly in your free time - forget it... )
<<<
Or could you do that and then use column 0 to simulate the row headers?
>>>
I wanted to use row headers - yes, simulation seems to be an "easy way to
go" - but I'd prefer row headers, which have special display view and
properties, which I do not want to spend time on simulation
implementation...
Thank you.
--
Shamil
-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of Gustav Brock
Sent: 1 ??????? 2010 ?. 15:24
To: dba-vb at databaseadvisors.com
Subject: Re: [dba-VB] WinForms: What is the best event for custom drawing
ona leftmost cell of DataGridView
Hi Shamil
I see. If you didn't need to draw your +/- you could just remove the row
headers. Or could you do that and then use column 0 to simulate the row
headers?
This:
http://webcache.googleusercontent.com/search?q=cache:lC1xHEMKuvUJ:dotnet.ita
gs.org/web-forms/121172/+%22C%23%22+DataGridView+show+rowselector+arrow&cd=7
&hl=da&ct=clnk&gl=dk
located in the Google cache suggests:
Handle the RowPostPaint event (Code Snippet):
void dataGridView1_RowPostPaint(object sender,
DataGridViewRowPostPaintEventArgs e) {
e.PaintHeader(DataGridViewPaintParts.All &
~DataGridViewPaintParts.ContentBackground);
}
Also, I located this thread which, however, perhaps collides with your +/-
drawing:
http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/34
6e5839-1813-472b-8b3a-7344118819b3
You may have seen it before (I just googled) but the topic seems pretty
close to that of yours.
/gustav
>>> shamil at smsconsulting.spb.ru 01-12-2010 12:49 >>>
Gustav --
I have currently used - Form.DefaultBackColor - that helped as my form
backcolor is the same as gridview's rowheaders backcolor (see code below) -
I'd still be interested is there a way to use .RowHeader cell's
Style.BackColor to paint row header background without row selection arrow.
There should be a "trick" I'm missing as .RowHeader cell's Style.BackColor
is equal to [Control] system color, which is R(0),G(0),B(0) when you get it
via code but it's in fact a very light gray color here. The trick should be
somehow related to the fact that I'm getting Graphics (g variable) from
GridView Handle, and then Style.BackColor becomes invisible - I should
probably get Graphics somehow else or convert color before using it but I do
not know how...
private void dataGridView1_RowPostPaint(object sender,
DataGridViewRowPostPaintEventArgs e) {
PlusMinusDrawer.Draw(dataGridView1, e, true, Form.DefaultBackColor); }
.....
public class PlusMinusDrawer
{
public static void Draw(DataGridView grid,
DataGridViewRowPostPaintEventArgs e,
bool drawPlus,
Color givenBackColor)
{
DataGridViewCell cell = null;
Color usedBackColor = Color.LightGray;
if (givenBackColor != null) usedBackColor = givenBackColor;
if (e.RowIndex == 0)
{
cell = grid.TopLeftHeaderCell;
//usedBackColor = cell.Style.BackColor;
drawPlusMinus(cell, 0, drawPlus, usedBackColor);
}
DataGridViewCell cell1 = grid.Rows[e.RowIndex].HeaderCell;
//usedBackColor = cell1.Style.BackColor;
drawPlusMinus(cell1, e.RowBounds.Y, drawPlus, usedBackColor);
}
private static void drawPlusMinus(DataGridViewCell cell, int
offsetY, bool drawPlus, Color backColor)
{
Graphics g = null;
System.Drawing.Pen pen = null;
Brush brush = null;
try
{
DataGridView grid = cell.DataGridView;
Rectangle headerBounds = new Rectangle(2, offsetY + 2,
cell.Size.Width - 4, cell.Size.Height - 4);
brush = new System.Drawing.SolidBrush(backColor);
g = Graphics.FromHwnd(grid.Handle);
pen = new System.Drawing.Pen(Color.Black, 2F);
g.FillRectangle(brush, headerBounds);
int offsetX = 0;
int padX = 2;
int padY = 2;
int h2 = cell.Size.Height - padY * 2;
int w2 = grid.RowHeadersWidth - padX * 2;
int h = h2 / 2;
int w = w2 / 2;
int height = 14; // vertical line height
int width = 14; // horisontal line width
System.Drawing.Point[] p = new System.Drawing.Point[4];
// horizontal line
p[0].X = 0 + offsetX + w - width / 2 + padY;
p[0].Y = h + offsetY + padY;
p[1].X = 0 + offsetX + w + width / 2 + padY;
p[1].Y = h + offsetY + padY;
g.DrawLine(pen, p[0], p[1]);
if (drawPlus)
{
// vertical line
p[2].X = w + offsetX + padX;
p[2].Y = 0 + offsetY + padY + h - height / 2;
p[3].X = w + offsetX + padX;
p[3].Y = 0 + offsetY + padY + h + height / 2;
g.DrawLine(pen, p[2], p[3]);
}
}
finally
{
if (brush!= null) brush.Dispose();
if (pen != null) pen.Dispose();
if (g != null) g.Dispose();
}
}
}
Thank you.
--
Shamil
-----Original Message-----
From: Shamil Salakhetdinov [mailto:shamil at smsconsulting.spb.ru]
Sent: 1 ??????? 2010 ?. 14:25
To: 'Discussion concerning Visual Basic and related programming issues.'
Subject: RE: [dba-VB] WinForms: What is the best event for custom drawing
ona leftmost cell of DataGridView head
Hi Gustav --
Thank you for your sample code.
I have to simulate hierarchical GridView (just one level) using DataGridView
(I do not use third-party controls - that's my customer requirement).
I do use RowPostPaint event to draw (+) - collpased , and (-) - expanded row
sign on row header cells as well as on top-left cell - the latter is used to
note/control collapsed/expanded datagridview rows on first level.
All works fine except that I cannot find how to suppress/hide row selector
arrow - when I use:
- DataGridViewCell's .Style.BackColor to paint RowHeader cell's background
- SelectionMode = CellSelect
- ShowEditingIcon = False
the record selector is still visible.
I have to use custom color - Color.LightGray to paint it over.
Thank you.
--
Shamil
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