Re: Changing form controlls at runtime - Windows Forms Discussion Boards

Mycroft Holmes27-Aug-09 16:10

27-Aug-09 16:10

This become a design issue, I assume there is a bunch of data in the base class and different data in the other classes. I would split the form into 3 panels, the subclass will determine which one is displayed. I usually design them side by side and move the visible on into position at runtime.

Re: Changing form controlls at runtime

Gilliann27-Aug-09 16:41

Gilliann

27-Aug-09 16:41

so essentially I just change the visibility property of my container? Thats going to be rather messy in the designer eh?

Re: Changing form controlls at runtime

Mycroft Holmes27-Aug-09 16:53

Mycroft Holmes

27-Aug-09 16:53

Sure, that's why I double the width of the form and make the adjustment and visibility immediately after InitializeComponent is called in the constructor.

I don't really care what the designer looks like - it is the runtime that I want to be good. I have one form where I use 5 such panels and have to use bringtofront in the designer to work with them, a complete PITA but the users don't know.

Re: Changing form controlls at runtime

darkelv27-Aug-09 17:08

darkelv

27-Aug-09 17:08

You can make the class specific UI portion into seperate forms or user controls, ie FormA for displaying ClassA object, FormB for displaying ClassB object.

A main form to display your common fields, in the main form a container (panel) shall hold either FormA or FormB, depending on the conditions that you want.

If it's ClassA, create an instance of FormA, and put it into the container (panel), call the necessary object passing and binding on FormA, vice versa for ClassB.

That way you don't need to mess around all the controls on the main form.

To put a form into a panel

formA.TopLevel = false;
formA.Dock = DockStyle.Fill;
formA.FormBorderStyle = FormBorderStyle.None;
panel1.Controls.Add(formA);
formA.Show();

Re: Changing form controlls at runtime

Luc Pattyn28-Aug-09 0:57

Luc Pattyn

28-Aug-09 0:57

yep. that's what I sometimes do in such cases.
The alternative is designing Panels, not Forms.
That takes less property settings to get it working.

Smile | :)

Luc Pattyn

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Re: Changing form controlls at runtime

Mycroft Holmes29-Aug-09 18:29

Mycroft Holmes

29-Aug-09 18:29

Oi, that's cheating, I had not thought to use a form as a sub control. That will make the development much simpler. Have another 5

Never underestimate the power of human stupidity
RAH

Re: Changing form controlls at runtime

BillWoodruff1-Sep-09 14:47

BillWoodruff

1-Sep-09 14:47

darkelv wrote:
To put a form into a panel

Hi Darkelv,

Fascinating !

I don't think I've ever put a Form inside a Panel, although I've certainly put Forms inside Forms (and a pet peeve is that a Form placed inside a Form doesn't automatically stay in the bounds of the Parent Form, although once you've written code to handle that (as I have [or created your own sub-classed Form where 'staying inside the Parent' is implemented]), you can just re-use that code).

I'm very curious as to what you think the strategic advantages of putting a Form in a panel (compared to a UserControl, or another Panel) would be; what type of scenario would this add value to.

Appreciate your thoughts.

best, Bill

"Many : not conversant with mathematical studies, imagine that because it [the Analytical Engine] is to give results in numerical notation, its processes must consequently be arithmetical, numerical, rather than algebraical and analytical. This is an error. The engine can arrange and combine numerical quantities as if they were letters or any other general symbols; and it fact it might bring out its results in algebraical notation, were provisions made accordingly." Ada, Countess Lovelace, 1844

Re: Changing form controlls at runtime

darkelv3-Sep-09 19:36

darkelv

3-Sep-09 19:36

Hi Bill,

You can set the form's dock to Fill when putting Form inside Form's Control property, for auto fitting in the parent form.

One advantage is you can easily change your presentation from one way to another, for example from above, instead of putting FormA or FormB in panel, you can easily change it to show FormA or FormB as popup forms.

Also, I can easily test the form without needing to create a form to host the user control or panel, wire up all the events, etc.

Though using Form, the application may get a bit heavier.

Datagridview formatting [modified]

Mycroft Holmes25-Aug-09 17:59

Mycroft Holmes

25-Aug-09 17:59

This is a rant not a question.

I have 2 DGVs with approx 1000 rows each on a single form, each has 14 columns and I need to format the alignment and text of the last 6 columns.

I created this utility event that uses the cell format event to set the alignment based on the columns underlying data type (ValueType) and assigned it to both grids. Performance is not good, there is an appreciable delay when loading and filtering the grids, about 3-5 seconds

public static void dgCellFormat(object sender, DataGridViewCellFormattingEventArgs e)
{
    DataGridViewColumn oCol = (sender as DataGridView).Columns[e.ColumnIndex];
    string vt = oCol.ValueType.ToString().ToLower();
    switch (vt)
    {
        case "system.int32":
        case "system.int16":
        case "system.int64":
            e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            //if the right 2 characters are not ID then add , to the value
            if (!oCol.HeaderText.EndsWith("ID"))
            {
                e.CellStyle.Format = "#,#";
            }
            break;
        case "system.decimal":
            e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            //if the right 2 characters are not ID then add , to the value
            if (!oCol.HeaderText.EndsWith("ID"))
            {
                e.CellStyle.Format = "#,#.00";
            }
            break;
        case "system.datetime":
            e.CellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            break;
    }
}

So I thought if cell formatting is slow then formatting the columns defaultcellstyle should be better performance. WRONG Mad | :mad:

, setting the defaultcellstyle instead of cellformatting resulted in a delay of approx 50 seconds when loading. I suppose b/c the grid formats all the data instead of just the data on display.

[edit] Thanks to comments from darklev I moved the above formatting into the column creation process, removing the AutoGenerate columns and formatting the columns to meet my requirements. Work perfectly without the overhead. [/edit]

Last modified: 123hrs 51mins after originally posted --

Re: Datagridview formatting

Obsidian71329-Aug-09 16:08

Obsidian713

29-Aug-09 16:08

Are you using AutoGenerateColumn=true?

Why not define the columns as what you would like, before populating the data onto the DataGridView?

Re: Datagridview formatting

Mycroft Holmes29-Aug-09 18:26

Mycroft Holmes

29-Aug-09 18:26

This is a generic tool, take any DGV and any datatable and throw them together pass the result through this and you get a well formatted result. Customising a DGV for a specific datatable is not the goal, that way lies WPF.

I loathe coding twice, so I often (nearly always) build a utility method that will service the bulk of my requirements. Then in the few time it needs tweaking I do the custom formatting. As an example I had almost forgotten how to bind a data control, I have had a utility that does it since dotnet 1.

Never underestimate the power of human stupidity
RAH

Re: Datagridview formatting

darkelv29-Aug-09 18:59

darkelv

29-Aug-09 18:59

What I meant was before you assigned the dataset to the datagridview, build the columns base on your existing logic, versus look at each cell's data type and set the alignment for that cell(you are repeating this 1000 times or how many rows in the data table).

It can still be generic to the data type of each column.

After all, each column will have a specific data type, there's no point to do the alignment on every cell/row.

Re: Datagridview formatting

Mycroft Holmes29-Aug-09 21:00

Mycroft Holmes

29-Aug-09 21:00

darkelv wrote:
you are repeating this 1000 times or how many rows in the data table

Your logic is impeccable - it matches mine precisely. So I set the format of the columns using the defaultcellstyle - this takes an order order of magnitude longer than setting the cell formats. This is the basis of my rant!

Actually I think you will find it is doing it for the 100 or so cells that are currently on display.

Never underestimate the power of human stupidity
RAH

Re: Datagridview formatting

darkelv29-Aug-09 23:18

darkelv

29-Aug-09 23:18

Nevermind, you are not getting it..

You can define the columns _once_, before populating the datagridview with data.

Re: Datagridview formatting

Mycroft Holmes29-Aug-09 23:32

Mycroft Holmes

29-Aug-09 23:32

Ah click, I've been binding the DGV, then changing the columns, and paying the price. So get the table, define the columns based on the table and then bind the datatable. Oh bloody hell, my utils does this it just doesn't do the datatype formatting - stupid frikking twat

Thank you

Never underestimate the power of human stupidity
RAH

Regions in code

εїзεїзεїз24-Aug-09 22:27

εїзεїзεїз

24-Aug-09 22:27

As we can create Regions in code like

#Region "1).Declarations"
Dim con As SqlConnection
end region

similarly can we make sub blocks or sub regions with in a region

Best Of regards,
Softdev

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Re: Regions in code

Henry Minute25-Aug-09 1:08

Henry Minute

25-Aug-09 1:08

The easiest way to resolve a question like this is to try it.

What can it break?

Be brave!

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: Regions in code

εїзεїзεїз25-Aug-09 5:49

εїзεїзεїз

25-Aug-09 5:49

yes could not find any sub blocks with in regions D'Oh! | :doh:

did u try and found something

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Re: Regions in code

Henry Minute25-Aug-09 5:55

Henry Minute

25-Aug-09 5:55

AFAIK you can nest #region/#end region blocks several layers deep. Not sure if there is a limit.

Re: Regions in code

εїзεїзεїз25-Aug-09 14:58

εїзεїзεїз

25-Aug-09 14:58

thanks i got it v can

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Re: Regions in code

εїзεїзεїз29-Aug-09 22:12

εїзεїзεїз

29-Aug-09 22:12

But how ca we make regions in Function Bodies

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Disabling scrolling in RichTextBox ??

ashkan87_224-Aug-09 0:12

ashkan87_2

24-Aug-09 0:12

Hello,
I'm developing a simple text highlighting editor, and I can't disable scroll bars when I call the Select(int start, int length) method of the RTB, for example The cursor is on the 40th line and I want to select an expression at line 1 and do something on that, but doing this causes the RTB to scroll to the first line and so this is considered a bug !

can anyone help me ??

Thanks,
ashkan s.

Re: Disabling scrolling in RichTextBox ??

εїзεїзεїз24-Aug-09 15:19

εїзεїзεїз

24-Aug-09 15:19

Is not this its default behavior which i have doubt that you can change , try to work on your selection of expression thing code it will be more better and prospective then to this scroll bar thing

Best Of Regards,
SOFTDEV
Sad like books with torn pages, sad like unfinished stories ...

Re: Disabling scrolling in RichTextBox ??

ashkan87_225-Aug-09 0:11

ashkan87_2

25-Aug-09 0:11

Can you explain more ? Unfortunately I didn't understand ....

thank you,
ashkan s.

Stupid Scrollbar bug

LloydA11123-Aug-09 8:43

LloydA111

23-Aug-09 8:43

I'm shocked by this bug.

Create a scrollbar and in the Scroll event write some code to tell you the value of the scrollbar, ie. the text in a label etc.

What I've noticed:

1.) It is impossible for it to be dragged to the value of 100.

2.) If you slowly drag it all the way to the end of the scrollbar, you might get a value of 86 or 90, but if drag it quick enough you might get something as low as 59.

Has anyone else noticed this?

If everything was not true, would it be not true that everything is not true? So by saying everything is not true, you are automatically denying that everything is not true. Im so confused...

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