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How can I Edit a Readonly DataGrid?

5-Jun-04 8:21

See the article, C# List View (v1.3)[^] for an example with source code included.

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mkomasi5-Jun-04 2:16

mkomasi

5-Jun-04 2:16

Hi,
I want to edit just a cell or a row in a DataGrid.
I think that I have to set Readonly property to true, but when I change this property to false all cells and rows will be editable.
I know I can have it easily in web application, but I want to know how can I do it in C# windows application.

Re: How can I Edit a Readonly DataGrid?

Heath Stewart5-Jun-04 8:17

Re: Datagrid and a checkbox

5-Jun-04 8:17

Edit the data itself and update the DataGrid. This works different than in ASP.NET because it is different that in ASP.NET. In Windows Forms, it's a control. In ASP.NET, it simply generates different HTML based on state. There's a big difference.

Once you've edited the data (like a DataSet, which you should use the DataTable.DefaultView to take into account any re-ordering), you can re-data-bind your control either by setting the DataSource property to null and then back to the DataSet (or whatever), or refresh the CurrencyManager like so:

CurrencyManager cm = (CurrentyManager)
  dataGrid1.BindingContext[dataGrid1.DataSource,
    dataGrid1.DataMember];
if (cm != null) cm.Refresh();

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Datagrid and a checkbox

MeterMan4-Jun-04 20:46

MeterMan

4-Jun-04 20:46

I have seen this done before but am still not clear on exactly how it is done cause for some reason its not working for me. Here are the steps I have taken.

1) Make a DataGrid 2) Make the DataAdapter 3)Make the Dataset 4) set the properties of the datagrid Source=dataSet11 Member=Movie 5) then the code

I have 2 columns in my dataset one title the other information. I want to add a checkbox so I try to do something like the following.

oleDbDataAdapter1.fill(dataSet11);

/**********************************************
 * want to make a check box so i try this
 **********************************************/

DataGridTableStyle tablestyle = new DataGridTableStyle();
tablestyle.MappingName = "Movie"; // map it to my table name
DataGridColumnStyle boolCol = new DataGridBoolColumn(); // make the bool box
boolCol.MappingName = "Current"; // name it 
boolCol.HeaderText = "Info Current"; // its header
boolCol.Width = 70; // its width
tablestyle.GridColumnStyles.Add(boolCol); // add the bool style 
dataGrid1.TableStyles.Add(tablestyle);// add the style to my datagrid

All i get is a datagrid with no fields, or rows. It should be simple to fix but I'm drawing a blank.
Thanks for the help in advance.

Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"

Heath Stewart5-Jun-04 7:49

Handle Click on MenuItems with sub menu

5-Jun-04 7:49

Don't declare your DataGridBoolColumn as it's base class: declare it as a DataGridBoolColumn and set the FalseValue and TrueValue members. Then add your DataGridBoolColumn to the DataGridTableStyle.GridColumnStyles property (no need to cast it - it's a derivative class).

In general, declare your variables as the type you instantiate so you can access members declared by the type. It's still an instance of its base classes.

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jeegar4-Jun-04 14:47

jeegar

4-Jun-04 14:47

Is there anyway I can handle click event on a MenuItem which has sub menu. The default behaviour is the click opens up the submenu.
I want to handle the click in two different ways in different circumstances.
In one circumnstance I want to go for default behaviour to open submenu
in other I want to go to the click event handler on this MenuItem.

For some (good?) reason MenuItem is not derived from Control so I can't override WndProc. Does someone know how to catch mouse events on Menu ?

Also is it possible to figure out exactly which Point on the MenuItem did the user click ? I can use this to draw a OwnerDrawn Menu and achive what I want.

waiting eagerly for some suggestion

Re: Handle Click on MenuItems with sub menu

leppie4-Jun-04 19:47

Re: Handle Click on MenuItems with sub menu

4-Jun-04 19:47

look at the onpopup event Smile | :)

^{top secret xacc-ide 0.0.1}

Heath Stewart5-Jun-04 7:46

Re: c#-configuration file

5-Jun-04 7:46

Why should a MenuItem derive from Control? A MenuItem simply encapsulates an HMENU (menu handle) and the related Windows APIs - it is not a control nor does it even act like the control. There's no good reason that it should derive from a control.

Read the Platform SDK for more details.

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c#-configuration file

Member 11509014-Jun-04 11:20

Member 1150901

4-Jun-04 11:20

i am working on n tier application and got 3 projects on my soloution.
in the end i just supply dll file.
the upper layer is a test one and its not part of the dll that i have to supply. i want to use the App.config file and i dont want him to be at the test layer(because its not part of my dll), i want to create the app.config file at the middle layer(which is my Data access layer).
The problem is that when i am creating the App.config file at a project that is not set as startUpProject i cant read from him or write.
the only way i can read from the App.config is when i am creating him under the StartUpProject.
How can i use an App.config file for my entire Project(3 projects) and not to put him under the StartUpProject and after all i will be able to use it ofcoures
thanks
Dudi

Be Good...
Dudi

Heath Stewart5-Jun-04 7:44

5-Jun-04 7:44

Only .exe's and ASP.NET web applications automatically read from a .config file. The app.config file has to be in the same directory and named the same (plus .config at the end) as the executable file. DLLs do not automatically have their own .config files unless you create your own executable loader (not an easy thing) or create a new AppDomain with a separate .config file just for a DLL.

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C# Transparency issues

Adam Durity4-Jun-04 10:24

Adam Durity

4-Jun-04 10:24

Hey,

So i'm working on this form that fades in and out depending on when it's active or not. Essentially it's a for loop that just iterates the opacity value of the form up to the desired value.

for(float f = 0.0f; f < 0.5f; f += 0.05f)
{
this.Opacity = f;
}

The problem is, this is really slow and flickery. I'm hoping to get something around the speed of the fading in and out of Winamp 5, if you all have seen that. something along the lines of 100-500ms, or even < 1s, but still have it look smoothe and not flicker so much. Any suggestions? I mean will DirectDraw do what I want? Thanks.

-- Adam

"If you can't beat your computer in chess, try kickboxing"

Heath Stewart4-Jun-04 10:43

4-Jun-04 10:43

Through a Thread.Sleep in the loop taking into account the duration of the effect and the number of iterations required.

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Adam Durity4-Jun-04 10:44

Adam Durity

4-Jun-04 10:44

Wouldn't that make the fade longer?

-- Adam

"If you can't beat your computer in chess, try kickboxing"

Heath Stewart4-Jun-04 10:48

4-Jun-04 10:48

Right now your loop doesn't take any time into account and depends upon the speed of your machine. You need to control the opacity. Right now, the loop would probably run so fast that it would appear to jump from 0.0 to 0.5 (or whatever it was) immediately. You need to control the duration. When you're talking about 10 ms or so, the naked eye typically won't catch it. Just think of movies you watch. In the use, it's only 29.97 fps (NTSC) where in other parts of the world it's like 30 fps (PAL) or something. Do you notice each individual frame? if you need 10 iterations and use Thread.Sleep(50) to sleep for 50 ms between each iteration, your fade effect will take only 500 ms like you mentioned a desire for in your first post.

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leppie4-Jun-04 10:53

4-Jun-04 10:53

Heath Stewart wrote:
Just think of movies you watch. In the use, it's only 29.97 fps (NTSC) where in other parts of the world it's like 30 fps (PAL) or something.

Movies are usually 24fps, while PAL is 25fps. Animations like Simpsons are tradionally 15fps, but I suspect that was before CG and computer animation came into play.

^{top secret xacc-ide 0.0.1}

Heath Stewart4-Jun-04 11:01

4-Jun-04 11:01

Actually, you had one right (PAL, and thanks for correcting me on that) but the 29.97 fps I am sure of. See http://www.microcinema.com/index/ntsc[^], for example.

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leppie4-Jun-04 11:06

4-Jun-04 11:06

Heath Stewart wrote:
you had one right

Sorry, with movies, I meant film as in the theater, thats 24fps, NTSC (never the same color) is 29.97fps Smile | :)

^{top secret xacc-ide 0.0.1}

leppie4-Jun-04 10:49

4-Jun-04 10:49

It would, but that would make the fade more 'realistic'. Also call Application.DoEvents() after each call, so the UI seem to 'respond'.

^{top secret xacc-ide 0.0.1}

bneacetp4-Jun-04 17:11

bneacetp

4-Jun-04 17:11

You could handle this using a timer in your form. Handle its elapsed event and make gradual changes with each tick, stopping the counter when the opacity reached its min or max. I have done this and it produces no flicker.

Happy Programming and God Bless!

Internet::WWW::CodeProject::bneacetp

Side TabControl

kaleid4-Jun-04 9:38

kaleid

4-Jun-04 9:38

I'm looking for a .NET control that implements a "sideways" tab strip or tab control. Basically, like the tab control in Windows Forms, but on the side of the form rather than at the top or bottom. Ideally, text orientation and colors, fonts, styles, etc. should be flexibile.

Anyone know of any such control (free or commercial)?

--Tim

Re: Side TabControl

Carlos H. Perez4-Jun-04 10:37

Carlos H. Perez

4-Jun-04 10:37

The TabControl in the SharpLibrary is very flexible. It might be what you are looking for.

Here are some screen shots.
SharpLibrary TabControlEx.

Regards,
Carlos

SharpLibrary Website

Re: Side TabControl

leppie4-Jun-04 11:02