C / C++ / MFC

9-Oct-07 22:53

Hi,

Is it possible to make the client area of a window as non-rectangular? If yes how?

Thanks in advance.

- NS -

Nelek9-Oct-07 23:14

9-Oct-07 23:14

Yes, i have a word document where it is explained how to make a round window, the most important problem... It is on spanish. But if you want I can send you it, and take a look in the code that is being explained (altough you can not understand the explanations)

if rounded is possible, I guess polygonal will be possible too.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Nishad S9-Oct-07 23:29

9-Oct-07 23:29

Thank you for the replay. But are you sure that it says about creating the client area as round? Or simply the window?

Anyway I dont know Spanish Frown | :(

But if you kindly send it I may try by using any translators Smile | :)

- NS -

Nelek10-Oct-07 0:30

10-Oct-07 0:30

Now that you say it... it is a round window (I read it too quick). So it problably won't be usefull at all. Sniff | :^)

But... it is a bit difficult to see the concept, if the window is not round... why to stablish a round client area?

and an innocent try...

have you thought about masking the squared client area with a user defined region and avoiding all what is outside the limits of the region?

Nishad S10-Oct-07 2:27

10-Oct-07 2:27

Let me say an example. Suppose my window has a round shape. And it has child controls. And my requirement is that, the border should be of a few pixels. So the childs should be clipped by the round client border if it is placed beyond the client. If only rectangular shape is possible for client, you can imagine what will be the problem. There will be non uniform border thickness, right?

- NS -

Nelek10-Oct-07 20:39

10-Oct-07 20:39

Send me a pm to have your email and I will send you the document anyways, there may be some code that gives you an idea.

eli1502197910-Oct-07 0:02

eli15021979

10-Oct-07 0:02

You can create a region using a bitmap.
Here is one example :http://www.codeproject.com/dialog/cdialogsk.asp[^]

Eli

Nishad S10-Oct-07 0:10

10-Oct-07 0:10

Sorry. This is not what I am looking for.

- NS -

Mark Salsbery10-Oct-07 6:14

Mark Salsbery

10-Oct-07 6:14

The client area of a window is kind of an abstract concept.

The WM_NCHITTEST message is used by the system to determine points
in or outside of the client area.

You can handle this message and adjust the return value appropriately.

For drawing, you'll need to use clipping regions if necessary.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Nishad S10-Oct-07 17:45

10-Oct-07 17:45

But what about the clipping of child controls by the client area?

- NS -

David Crow11-Oct-07 2:58

David Crow

11-Oct-07 2:58

See here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Nishad S11-Oct-07 18:48

Re: Non-rectangular client area [modified]

11-Oct-07 18:48

Thank you. But I could not found the solution for my doubt. I am not talking about the NcHitTest. But the actual client area, by which the child's visibility is clipped. AFAIK client are cannot be non-rectangular. Frown | :(

- NS -

rnendel1-Feb-10 6:06

rnendel

1-Feb-10 6:06

Yes, I just did it.&nbsp;&nbsp; The concept is fairly easy to implement if you are managing your own custom container control ( which I'm fairly certain is what you are doing based on the thread ).

To implement this; however, you need to use only custom child controls or child controls that have OnPaint() overridden so that you can interject a clipping region prior to the child control being rendered.

1. In your custom container control, in the OnPaint() event, calculate the desired client area GraphicsPath.&nbsp;&nbsp; Save that path as a public member for later use by chlid controls, let's name it 'ClientAreaPath' for fun.

2. For any control that can be added to your custom container, define the control as a custom control, or at least inherit and override the OnPaint() event.

3. In your child controls, in the OnPaint() override, determine if the control is a child of your custom container and, if so, then transform and apply the ClientAreaPath that was calculated and saved in step #1 above.&nbsp;&nbsp; Viola - non-rectangular clipping Smile | :)

Here's a rough c# outline of the child control OnPaint() operations.

public override void OnPaint( PaintEventArgs e )
{
   // determine if this control is parented and if the parent can supply a ClientAreaPath
   try
   {
         // attempt to cast, will cause exception if nothing else
         MyCustomContainer parentContainer = ( MyCustomContainer )Parent;

         // get a copy of the custom client path
         GraphicsPath p = new GraphicsPath(parentContainer.ChildPath.PathPoints, parentContainer.ChildPath.PathTypes);

         // transfrom the path to be relative to the client (critical step here)
         // all paths are "zero-relative" so the client needs to see this path expressed
         // not as zero-relative, but client-location relative instead
         Matrix translateMatrix = new Matrix();
         translateMatrix.Translate(-(Location.X), -(Location.Y));
         p.Transform(translateMatrix);

         // now apply a nice clipping region to the control's graphics object so that
         // all subsequent render related operations will clip appropritely
         e.Graphics.SetClip( p );
   }
   catch( &lt;bleh&gt; )
   {
   }

   // ******* now render your control using whatever means you want, just make sure that
   // you do not reset the clipping path - if you need to clip additional client-relative
   // areas, use a clipping combine mode of compliment ( or whatever that option is )
}

Hope this helps Smile | :)

Of course, based on the date of the post ( 3 years ago ), probably not LOL.

modified on Monday, February 1, 2010 12:32 PM

Nishad S1-Feb-10 13:36

1-Feb-10 13:36

rnendel wrote:
Hope this helps Of course, based on the date of the post ( 3 years ago ), probably not LOL.

This solution was not applicable (at that time) I think... Smile | :)

- ns ami -

request time out

neha.agarwal279-Oct-07 22:20

neha.agarwal27

9-Oct-07 22:20

Hello all,

I have written a code for getting html code of any given link using api's .
Now what i want is when a particular page is taking more then 10 sec to get its html code a message box stating time out should be displayed. How can i do this?

Thanks in advance

Re: request time out

Nelek9-Oct-07 22:24

9-Oct-07 22:24

You can use SetTimer (...) when the function to get the code starts, and KillTimer (...) when the function ends succesfully with the download of the code.

If the timer reachs the end of the interval, then you can code you dialogbox with the error in the message WM_TIMER.

hope it helps

Re: request time out

neha.agarwal2710-Oct-07 23:50

neha.agarwal27

10-Oct-07 23:50

SetTimer is a function in CWnd class and i am doing all my processing in a worker thread. How to apply this functionality in a thread

Re: request time out

Nelek29-Oct-07 22:15