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Move listbox items up/down

11-Jun-08 7:11

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N a v a n e e t h10-Jun-08 1:52

10-Jun-08 1:52

I have a collection class which wraps a generic List. This collection has two methods say, MoveUp and MoveDown. When MoveUp is called with an item, the supplied item will be moved one location down in the collection. There are events available for these operations.

I have a custom control which wraps ListBox. This control has subscribed for the events in my collection class. So when there is MoveUp or MoveDown in the collection, this control will get notifications.

Now I need to rearrange the listbox items according to the collection items when something moves up or down. I am doing this by removing all listbox items and adding it again which seems to be a bad idea and also it flickers the control.

Is there any better way to do this ?

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Ashfield10-Jun-08 2:16

Ashfield

10-Jun-08 2:16

What about swapping them?

Move up

Object o = lb1.items(lb1.selectedindex -1 ) 
lb1.items(lb1.selectedindex -1 )  = lb1.items(lb1.selectedindex)
lb1.items(lb1.selectedindex) = o

Obviously needs a bit of tinkering and checking for top/bottom, but you get the gist.

Bob
Ashfield Consultants Ltd

N a v a n e e t h10-Jun-08 3:25

10-Jun-08 3:25

Thanks Bob, I will give a try

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#realJSOP10-Jun-08 2:49

#realJSOP

10-Jun-08 2:49

Remove the selected one, and re-insert it one position higher (don't forget to account for being at the top or bottom of the listbox). Also, you can avoid flickering if you turn off updates, remove/insert, and then turn updates back on.

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N a v a n e e t h10-Jun-08 3:24

10-Jun-08 3:24

John Simmons / outlaw programmer wrote:
Remove the selected one, and re-insert it one position higher (don't forget to account for being at the top or bottom of the listbox

Fair idea. Thanks John

John Simmons / outlaw programmer wrote:
if you turn off updates, remove/insert, and then turn updates back on.

I can't find how to turn off updates. Do you mean to calling SuspendLayout() and ResumeLayout() ?

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#realJSOP10-Jun-08 6:21

#realJSOP

10-Jun-08 6:21

It's actually BeginUpdate() and EndUpdate()...

N a v a n e e t h10-Jun-08 7:25

10-Jun-08 7:25

Thanks. I will take a look at that

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Ctrl+S Implemention

half-life10-Jun-08 1:19

10-Jun-08 1:19

Hi,

i'm Trying to Implement the Ctrl+S (save)
Do i need to Monitor the KeyPress Events and check The Last Two Keys Pressed
or there is an easer way ( a Buit -In ) Smile | :)

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see_seA10-Jun-08 1:30

see_seA

10-Jun-08 1:30

private void form_KeyDown(object sender, KeyEventArgs e)
 {
     // shortcuts
     if (e.Control && e.KeyCode == Keys.S)
         // do action

half-life10-Jun-08 1:41

10-Jun-08 1:41

Thanks a Lot Smile | :)

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jamie55010-Jun-08 1:33

jamie550

10-Jun-08 1:33

KeyUp's (or KeyDown's) KeyEventArgs has a Control property, then just check KeyCode for S.

Pete O'Hanlon10-Jun-08 1:39

Pete O'Hanlon

10-Jun-08 1:39

If you have a menu on the form, just set the shortcut to Ctrl+S on your Save item.

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half-life10-Jun-08 1:48

10-Jun-08 1:48

Wow, Thanks A lot
i Never Knew this Feature Exsits
Thanks Agian Smile | :)

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half-life10-Jun-08 2:23

10-Jun-08 2:23

I What some UserControl
each with a Menu
the Funny thing is that it always selects the last and perform the Action on it

any IDEA Smile | :)

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Pete O'Hanlon10-Jun-08 3:19

Pete O'Hanlon

10-Jun-08 3:19

You can't have the same shortcut assigned to different actions. You need to supply a different shortcut.

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half-life10-Jun-08 3:25

10-Jun-08 3:25

Thanks

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Lock Form

half-life10-Jun-08 1:16

10-Jun-08 1:16

Hi,

i'm trying to Lock The Form so that the user would'nt be able to Move it

How can i Do It, i'd tried a variaty of properties, non helped

any Suggestions Smile | :)

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Giorgi Dalakishvili10-Jun-08 1:26

Giorgi Dalakishvili

10-Jun-08 1:26

Set the FormBorderStyle property to FormBorderStyle.None

Giorgi Dalakishvili

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half-life10-Jun-08 1:35

10-Jun-08 1:35

Thanks A Lot
I Never Thought to Try This Thanks Again Smile | :)

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jamie55010-Jun-08 1:41

jamie550

10-Jun-08 1:41

Or if you want to keep the titlebar and other stuff:

class Form1
{
Point pos;
public Form1()
{
InitializeComponent();
this.Pos=new Point(this.Left,this.Top);
this.Move+=Form1_Move;
}
void Form1_Move(object sender, EventArgs e)
{
this.Left=pos.X;
this.Top=pos.Y;
}
}

half-life10-Jun-08 2:18

How to define object type in ArrayList ?

10-Jun-08 2:18

Thanks

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Yanshof10-Jun-08 1:07

Yanshof

10-Jun-08 1:07

I want to define the object type in the ArrayList to be string - i dont want to leave is as Object.

How to do it ?

Re: How to define object type in ArrayList ?

N a v a n e e t h10-Jun-08 1:22