C# Discussion Boards - CodeProject

Update designer after updating a property

Christopher Stratmann6-Jul-07 3:06

6-Jul-07 3:06

I have a custom control with a custom property. After compiling the project I place my custom control onto a windows form in VS2005. From there I change my custom property on that custom control. The problem is that the custom control doesn't repaint on the designer to show my updated change. The following is the only way I have found to make the control repaint. Invalidate() after _Test = value; doesn't work. I also looked into the System.ComponentModel namespace for something to be placed before public int Test like [Browsable(true)] but didnt find anything. I tried [RefreshProperties(RefreshProperties.Repaint)] but I think that only repaints the properties grid and not the control on the designer. Any ideas???

private int _Test = 0;
public int Test
{
   get { return _Test; }
   set
   {
      _Test = value;
      Width--;
      Width++;
   }
}

Chris

Re: Update designer after updating a property

snorkie6-Jul-07 4:14

snorkie

6-Jul-07 4:14

Chris,

After using Invalidate(); add the following code.

Application.DoEvents();

Once you invalidate the control, windows still has to go and re-paint it. By using the line above, you are telling it to do any events right now.

Hogan

Re: Update designer after updating a property

Christopher Stratmann6-Jul-07 4:28

Christopher Stratmann

6-Jul-07 4:28

Ya thanks a lot. It worked great.

Chris

Re: Update designer after updating a property

Martin#6-Jul-07 6:57

Martin#

6-Jul-07 6:57

Hello,

As snorki said befor Invalidate requires DoEvents, to have an emidiate reaction.
But DoEvents is not a nice solution as it runs the whole message loop again.

I would prefere the Refresh() method.

All the best,

Martin

Tool tip text in a button

-spy-6-Jul-07 2:45

-spy-

6-Jul-07 2:45

hey guys..
anyone know how to make tool tip text in a button..im using C#.net 2003..n_n

Re: Tool tip text in a button

kubben6-Jul-07 2:56

kubben

6-Jul-07 2:56

I think you are talking about in windows. Here is some sample code form microsoft help:

// This example assumes that the Form_Load event handling method
// is connected to the Load event of the form.
private void Form1_Load(object sender, System.EventArgs e)
{
   // Create the ToolTip and associate with the Form container.
   ToolTip toolTip1 = new ToolTip();

   // Set up the delays for the ToolTip.
   toolTip1.AutoPopDelay = 5000;
   toolTip1.InitialDelay = 1000;
   toolTip1.ReshowDelay = 500;
   // Force the ToolTip text to be displayed whether or not the form is active.
   toolTip1.ShowAlways = true;
      
   // Set up the ToolTip text for the Button and Checkbox.
   toolTip1.SetToolTip(this.button1, "My button1");
   toolTip1.SetToolTip(this.checkBox1, "My checkBox1");
}

Hope that helps.
Ben

GDI: Move Rect. using KeyDown/Up and Timer

oliiix6-Jul-07 2:31

oliiix

6-Jul-07 2:31

I'd like to move a Rectangle drawn over a form with the w,s,a,d keys. With the following code it works just fine:

private void Form1_KeyDown(object sender, KeyEventArgs kea)
{
kea.Handled = true;
if (kea.KeyData == Keys.A)
{
graphics.DrawRectangle(myPen_del, a, b, 30, 30);
a -= 4;
graphics.DrawRectangle(myPen, a, b, 30, 30);
}
}

(myPen.Color = black; myPen_del.Color = gray)

But: If I click a.e. 'a' and afterwards 'w', the rectangle i'm moving stucks a bit. That has to do with the windows timer (repeat delay / repeat rate).

What I don't know is how to calculate through KeyDown/Up Event what Keys are pressed and set a selfmade Timer so that the rectangle I'm moving flows and doesn't get stuck every time I'm pressing another button on the keyboard.

Has anyone got a good tutorial for this? Or some sample code about it? I will also gonna include moving the rect in 45° angle by pressing as example 'a' & 'w' together.

By this I will only draw my rectangle in the OnPaint-Event. So can anyone tell me how to manually launch the OnPaint-Event? Cause when I'm doing a Form.Refresh() my integers a and b will be resetted to Wink | ;)

I was really searching alot for this problem but haven't found anywhere something really helpful Frown | :(

Hope you understood my question and thank you very much in advance for looking into it Smile | :)

Re: GDI: Move Rect. using KeyDown/Up and Timer

Luc Pattyn6-Jul-07 2:57

Luc Pattyn

6-Jul-07 2:57

Hi,

you should manipulate the rectangle's coordinates in the KeyPress event (not KeyUp
or KeyDown) and call Invalidate;
and in the paint handler, you should draw the rectangle.
You wont need the myPen_del to undraw, since the paint handler will redraw
everything.
You may want to use doubleb-uffering to avoid or reduce flickering (see Form/Control
properties).
And you should choose more descriptive names for the rect's coordinates...

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: GDI: Move Rect. using KeyDown/Up and Timer

oliiix6-Jul-07 3:56

oliiix

6-Jul-07 3:56

Thanks alot for ur answer, really helps me in some points... The coordinates will be renamed as soon as I got this problem behind me;)

Now the problem's still (as I think) that when I press a button to move the rectangle, it still will get stuck by changing the key pressed... I should really integrate a timer but there I'm really lost^^

Re: GDI: Move Rect. using KeyDown/Up and Timer

Luc Pattyn6-Jul-07 4:09

Luc Pattyn

6-Jul-07 4:09

Hi,

I dont really see the problem; when you press a key (say 'a') it generates one
KeyDown, one KeyUp and one KeyPressed. When you keep it down for a while it
autorepeats, i.e. it generates a number of KeyPressed events (same as in a
text editor such as MS Word; I am not sure it may also repeat the KeyDown,
but not the KeyUp). That could be sufficient.

If you want a faster repeat rate, I think you must provide it yourself; this
is how I would do it:
- create method doOneKey(Keys key) that does what that key should do
(including the Invalidate !)
- create a class member: private Keys lastKeyPressed
- in KeyDown do lastKeyPressed=e.KeyCode and call doOneKey(lastKeyPressed)
- create a Forms.Timer and let it tick continuously (say 100 msec)
- in timer tick handler call doOneKey(lastKeyPressed)
- in KeyUp do lastKeyPressed=Keys.None
- dont use KeyPress

You might want to also handle LostFocus event (so the move
stops when your Form loses focus)

BTW I have choosen the Forms.Timer because that one ticks on the GUI thread,
so it can not create concurrency problems (its tick does not get handled in
the middle of a key event).

Hope this helps

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Re: GDI: Move Rect. using KeyDown/Up and Timer

oliiix6-Jul-07 4:20

oliiix

6-Jul-07 4:20

I think I just needed your last answer at least.. I'm just new to C# so I'm sometimes get confused although I should know the solution;) Thank you very very mutch!!

How to set The Break point Condition in vs.NET

Hum Dum6-Jul-07 2:20

Hum Dum

6-Jul-07 2:20

I try to set the condition for break point, but showing the error that condition is not correct.

I writr like Messageno == "ABC-001"
in condition textbox,

What is the correct way to set the condition?

Plz Guide me.

Re: How to set The Break point Condition in vs.NET

kubben6-Jul-07 2:51

kubben

6-Jul-07 2:51

There are a couple of ways you can do it. First you can set the break point in the code behind. Then if you go to your break point window you can add a condition to the break point so it will only break when your condition is met. You can also use System.Dianostics.Debugger.Break to cause your code to break point. This only works if you have compiled in a debug mode.

Hope that helps.
Ben

Dialog event

Maddie from Dartford6-Jul-07 1:59

Maddie from Dartford

6-Jul-07 1:59

Hello,
I am showing a form (MyForm) on some click event. I am having some buttons(Send, Get) on MyForm which are not mentioned as predefined event like OK or Cancel etc.

Still i want to know about the click event of the MyForm button.

I want
If(MyForm.ShowDialog() == DialogResult.Get)
{
}
How it can be implemented?????
Thanks..

Gajesh

Re: Dialog event

Pete O'Hanlon6-Jul-07 2:02

Pete O'Hanlon

6-Jul-07 2:02

Well, I would map the Get button to the OK result. Set the DialogResult for this button to OK. Then, you just need to check for DialogResult.OK.

Please visit http://www.readytogiveup.com/ and do something special today.
Deja View - the feeling that you've seen this post before.

Re: Dialog event

Martin#6-Jul-07 2:04

Martin#

6-Jul-07 2:04

You have to set the DialogResult property ycurselfe, before you close the form.

Re: Dialog event

Chintan.Desai6-Jul-07 2:13

Chintan.Desai

6-Jul-07 2:13

1st fire Send and Get button events with following code snippets:
btnSend.Click+=System.Windows.Forms.EventsArgs(...)

do same things for Get button.This will allow this event to occur.Now assign Get to Ok event of Dialog box.this will fire Get event when ok is clicked.

happy coding. Rose | [Rose]

Regards
Chintan
www.visharadsoft.com
(Nothing is so purify as KNOWLEDGE)

Need Suggestion for best Component Library for C#

logikos6-Jul-07 1:43

logikos

6-Jul-07 1:43

Hi,

Very new to C#, and to .Net for that matter (been doing mainly legacy stuff for 20 years). Well, .Net is incredible, but one thing that bums me out is that I pretty much have to trash all the 3rd party component libraries that I have invested my money in over the years and essentially start over.

I've been perusing ComponentSource.com and ran across ComponentOne Studio Enterprise (http://www.componentsource.com/products/componentone-studio-enterprise/index.html). This is coming out of my personal funds, and $899 is *ouch*, but it seems to have just about everything to get a good start.

What do you all think? Any other suggestions to get some good components without making me broke?

Thanks to you all,

J Miller

Re: Need Suggestion for best Component Library for C#

Pete O'Hanlon6-Jul-07 2:01

Pete O'Hanlon

6-Jul-07 2:01

What do you actually need the components for? While ComponentOne are good components, they cover both ASP.NET and WinForms. They also deal with reporting, grids and so on and so on.

I've tended to lean more towards DevExpress, and just picking the parts that I need rather than paying for everything. (You can also buy the components individually from ComponentOne).

For UI's, I'm currently using DevComponents. It's a very good product and Denis is continually updating it. Plus, with DevExpress and DevComponents, you can get the source code fairly inexpensively as well.

Please visit http://www.readytogiveup.com/ and do something special today.
Deja View - the feeling that you've seen this post before.

Re: Need Suggestion for best Component Library for C#

logikos6-Jul-07 2:24

logikos

6-Jul-07 2:24

Pete, thanks for the great recommendations. What they offer is fastastic!

Re: Need Suggestion for best Component Library for C#

Joseph Guadagno6-Jul-07 4:34

Joseph Guadagno

6-Jul-07 4:34

I would suggest since they are coming out of your personal funds you go with the DevExpress components. I know every once in a while they offer some of the components free, like their editor controls. DevExpress

Here are some of my articles.
Hope this helps!
Joseph Guadagno
http://www.josephguadagno.net

mouse position + map lon/lat C#

mercenary016-Jul-07 1:41

mercenary01

6-Jul-07 1:41

does C# have any function or method that I can call to get the lon and lat from some reference I have with regards to the pic and a mouse position. Hope the questions is clear...

Thanks

Samuel

Re: mouse position + map lon/lat C#

Martin#6-Jul-07 1:47

Martin#

6-Jul-07 1:47

mercenary01 wrote:
lon and lat

Re: mouse position + map lon/lat C#

mercenary016-Jul-07 1:48

mercenary01

6-Jul-07 1:48

longitude and latitude

Re: mouse position + map lon/lat C#

Christian Graus6-Jul-07 1:57

Christian Graus

6-Jul-07 1:57

No, how could it ? It would need to know the starting position and the scale of the image. Even then, not all map images will have steady change of lat/lng.

You need to write your own code, based on what you know about the image you're displaying.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

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