Hi Ron,
The WM_SIZING value can be found in C:\Program Files\Microsoft Visual
Studio\VC98\Include\WINUSER.H
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! -
www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
--------------------
| Newsgroups: microsoft.public.dotnet.languages.csharp
| From: (e-mail address removed) ("Jeffrey Tan[MSFT]")
| Organization: Microsoft
| Date: Thu, 13 Nov 2003 07:17:25 GMT
| Subject: Re: Fixed aspect size when form is resized
| X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
| MIME-Version: 1.0
| Content-Type: text/plain
| Content-Transfer-Encoding: 7bit
|
|
| Hi Ron,
|
| Thanks for posting in this group.
| If you just set the aspect ratio in the form_resize or form_sizechanged
| event, this may partially meet your need.
| But the form will resize with its size "flashing". This is because, when
| you set the height width ratio in the event, windows will resend WM_SIZE
| message to the form, which will make the form resize again, then the form
| will flashing size.
| I think to workaround this, you should hook its WM_SIZING message and
| change some fields.
| Here is the sample code
I wanna keep the width and height to the same
| value)
|
| [StructLayout(LayoutKind.Sequential)]
| public struct RECT
| {
| public int Left;
| public int Top;
| public int Right;
| public int Bottom;
| }
| public const int WM_SIZING = 0x0214;
| static int org_size=0;
| protected override void WndProc(ref Message m)
| {
| if(m.Msg==WM_SIZING)
| {
| RECT rc;
| rc=(RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT));
|
| if(rc.Right-rc.Left!=org_size)
| {
| rc.Bottom =rc.Right -rc.Left+rc.Top;
| Marshal.StructureToPtr(rc,m.LParam ,true);
| }
| else
| {
| rc.Right=rc.Bottom-rc.Top +rc.Left ;
| Marshal.StructureToPtr(rc,m.LParam ,true);
| }
| org_size=rc.Right -rc.Left ;
| }
|
| base.WndProc (ref m);
| }
|
| In this sample, I create a static variable org_size to store the origial
| form width.
| Then in the WM_SIZING message, we will determine if it is the width
| change(height follow width) or the height change(width follow height).
| It works well on my machine, if you still have any question, please feel
| free to let me know.
|
| Best regards,
| Jeffrey Tan
| Microsoft Online Partner Support
| Get Secure! -
www.microsoft.com/security
| This posting is provided "as is" with no warranties and confers no rights.
|
| --------------------
| | From: "Ron Vecchi" <
[email protected]>
| | References: <
[email protected]>
| <
[email protected]>
| | Subject: Re: Fixed aspect size when form is resized
| | Date: Wed, 12 Nov 2003 23:53:19 -0500
| | Lines: 43
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| |
| | I dont see how this will help with keeping the form a fixed aspect
ratio.
| |
| |
| | When the form starts up lets say it is 800x400, an aspect of 2/1
| | I have the FormBorderStyle set to sizable.
| |
| | Symotaneously as the user is sizing the form I would like to check the
| width
| | and keep the height excaly half of the value of the width. keeping the
| | aspect ratio of 2/1
| |
| | Im I missing something with using the Dock property?
| |
| | Thanks
| | Ron Vecchi
| |
| |
| | | | > hi ron
| | > just use the Dock-Property on the Control
| | > cheers Jazper
| | >
| | >
| | > | | > > I know the math I need to perform on width and height to keep an
| aspect
| | > > ratio but where and how would I implement keeping a set aspect
ratio
| on
| | a
| | > > form when a user resizes it. Override OnResize? couldn't quite
figure
| it
| | > > out.
| | > >
| | > >
| | > >
| | > >
| | > > --
| | > > Ron Vecchi
| | > >
| | > >
| | > >
| | >
| | >
| |
| |
| |
|
