473,389 Members | 1,098 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,389 software developers and data experts.

Scrolling problems in datagrid with invisible columns

Hello,

We're doing our own datagrid based on the System.windows.forms.datagrid
control, and are having some problems with horizontal scrolling.

In general, we construct our datagrid adding a tablestyle and
gridcolumnstyles to that tablestyle. If we have invisible columns, we add
the gridcolumnstyle with Width = 0 (couldn't find any other way to do it,
because there is no Visible property available...).

When we change column with the TAB key, it doesn't work right if the
invisible columns are in the visible area of the grid. Looking at the code
of the EnsureVisible method of the datagrid, it's something like this:
-----------------------------------------------------------
private void EnsureVisible(int row, int col) {
int local0;
if (row < this.firstVisibleRow || row >= this.firstVisibleRow +
this.numTotallyVisibleRows) {
local0 = this.ComputeDeltaRows(row);
this.ScrollDown(local0);
}
if (this.firstVisibleCol != 0 || this.numVisibleCols != 0 ||
this.lastTotallyVisibleCol != -1)
goto i-1;
return;
do {
this.ScrollToColumn(col);
} while (col < this.firstVisibleCol || col == this.firstVisibleCol &&
this.negOffset != 0 || this.lastTotallyVisibleCol == -1 && col >
this.firstVisibleCol || this.lastTotallyVisibleCol > -1 && col >
this.lastTotallyVisibleCol);
}
-----------------------------------------------------------
The problem is that, even if we can't see, for example, the column 0 because
it has its Width=0, the datagrid keeps saying that FirtsVisibleCol=0, so it
doesn't scroll right when it should. I guess the same is happening with the
rest of the private properties (numVisibleCols and lastTotallyVisibleCol)

Anybody has any ideas of how we can solve this problem? Is there a way to
tell the datagrid that Column0 is actually invisible?

Right now, the only way I can think of doing it is controlling columns with
Width=0 and scrolling the grid "by hand"...

Thank You very much,

Igor Mendizabal
Jul 22 '05 #1
3 1857
Igor,

Not using a column in a datagrid with styles means not creating a column for
it, what is your problem with that?

And when you don't use a style than you can hide it.

See this sample on our site, there are more samples about styles on our
site.

http://www.windowsformsdatagridhelp....3-a3539697edbd

(Using columns in a datagrid has always to do with mappings.)

I hope this helps,

Cor

Jul 22 '05 #2
Hello Cor,

I thought about your suggestion, but doesn't work in our case. The problem
is that our grids are mostly configurable by the user (they can
enable/reorder/hide columns), and there is a lot of code written by now that
accesses those columns, even if they are hidden, because it supposes that
they are there, only that we can't see them.

Anyway, I tried not to add the invisible gridcolumnstyles, and even thogh
the scrolling works fine, I broke more things than I fixed with that change,
so I'm gonna try to control if it should scroll in the CurrentCellChanged
event, and use the GridHScrolled method to make it scroll.

Thank you very much anyway,

Igor

"Cor Ligthert [MVP]" <no************@planet.nl> escribió en el mensaje
news:O7**************@TK2MSFTNGP09.phx.gbl...
Igor,

Not using a column in a datagrid with styles means not creating a column for it, what is your problem with that?

And when you don't use a style than you can hide it.

See this sample on our site, there are more samples about styles on our
site.

http://www.windowsformsdatagridhelp....3-a3539697edbd
(Using columns in a datagrid has always to do with mappings.)

I hope this helps,

Cor

Jul 22 '05 #3
Igor,

AFAIK is setting the mapping of a column to nothing enough to do what you
want when you use tablestyles.

Cor
Jul 22 '05 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
by: Steve Leckman | last post by:
I have a datagrid with multiple Columns. I want to control the Horizontal scrolling, so that the left two most columns DO NOT scroll when the scroll bar is used. Only the 3rd+ Columns scroll left...
4
by: Glenn Owens | last post by:
I have a DataGrid web control which I've dynamically populated with template columns to be used for bulk-editting. Generally, all of the columns are textbox and/or dropdownlist child controls. ...
0
by: Robert Brinson | last post by:
Hello all! I'm running .NET Framework 1.1 using VS.NET 2003. I've got a mystery with a DataGrid. Below is the definition of the DataGrid from my aspx page: </asp:datagrid><asp:datagrid...
15
by: John Blair | last post by:
Hi, Code attached but the line that gives me an error is MyDataGrid.Columns(2).Visible = False It actually gives me an error for any value instead of 2 even when 9 bound columns of data exist....
1
by: Willem | last post by:
Hi, I'm using a datagrid on a webform with 4 visible and 1 invisible columns. When clicking a button I want to make the invisible column visible. I use the code DataGrid1.Columns(4).Visible =...
0
by: Daniel Doyle | last post by:
Hello and apologies in advance for the amount of code in this post. I've also sent this message to the Sharepoint group, but thought that ASP.NET developers may also be able to help, even though...
1
by: John Bayly via .NET 247 | last post by:
I'm working on an inherited Datagrid class that includes afunction called onMouseMove to paint the row under the cursor tomake reading easier for users. To paint the row, the function sets the...
3
by: Igor Mendizabal | last post by:
Hello, We're doing our own datagrid based on the System.windows.forms.datagrid control, and are having some problems with horizontal scrolling. In general, we construct our datagrid adding a...
3
by: Phillip N Rounds | last post by:
I have a DataGrid in a web form (ASP1.1, C#, VS 2003) that I'm trying to add some functionality to, and I can't figure out how to do int. The existing DataGrid has several databound columns and a...
0
by: taylorcarr | last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: ryjfgjl | last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
0
by: ryjfgjl | last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.