space keys

11 Nov 2005 6:18 AM

Lloyd Dupont

I'm writing a custom Text editor.
My idea was to override ProcessDialogKey to handle command keys, such as the
arrow or delete
and to override OnKeyPress to get char typed.

Now I discover a few weird issues:
- the space key don't trigger OnKeyPress
- the backspace key does trigger OnKeyPress (with '\b')

is it something normal (why is that) and stable (I could rely on next
version to be like that as well)?

11 Nov 2005 11:49 AM

Claes Bergefall

I can't reproduce this. The standard textbox (correctly) generates KeyPress
for
both space and backspace

/claes

Show quote

"Lloyd Dupont" <net.galador@ld> wrote in message
news:OQJIFfo5FHA.2576@TK2MSFTNGP09.phx.gbl...
> I'm writing a custom Text editor.
> My idea was to override ProcessDialogKey to handle command keys, such as
the
> arrow or delete
> and to override OnKeyPress to get char typed.
>
> Now I discover a few weird issues:
> - the space key don't trigger OnKeyPress
> - the backspace key does trigger OnKeyPress (with '\b')
>
> is it something normal (why is that) and stable (I could rely on next
> version to be like that as well)?
>
>

11 Nov 2005 8:28 PM

Lloyd Dupont

I am overiding SWF.Control (not SWF.TextBox).
I also have these various set style set:
   SetStyle(ControlStyles.Opaque, true);
   SetStyle(ControlStyles.AllPaintingInWmPaint, true);
   SetStyle(ControlStyles.ContainerControl, false);
   SetStyle(ControlStyles.StandardClick, true);
   SetStyle(ControlStyles.StandardDoubleClick, true);
   SetStyle(ControlStyles.SupportsTransparentBackColor, false);
   SetStyle(ControlStyles.UserPaint, true);
   SetStyle(ControlStyles.UseTextForAccessibility, true);
   SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
   SetStyle(ControlStyles.ResizeRedraw, true);
   SetStyle(ControlStyles.Selectable, true);
   SetStyle(ControlStyles.UserMouse, true);

And my code is very simple indeed:
protected override void OnKeyPress(KeyPressEventArgs e)
{
    base.OnKeyPress(e);
    /// do something
    // space don't come here
}

Truth to tell I override ProcessDialogKey, but I do nothing and return
base.ProcessDialogKeys() on SPACE

Show quote

"Claes Bergefall" <claes.bergefall@nospam.com> wrote in message
news:%235a3%23Xr5FHA.2524@TK2MSFTNGP10.phx.gbl...
>I can't reproduce this. The standard textbox (correctly) generates KeyPress
> for
> both space and backspace
>
> /claes
>
> "Lloyd Dupont" <net.galador@ld> wrote in message
> news:OQJIFfo5FHA.2576@TK2MSFTNGP09.phx.gbl...
>> I'm writing a custom Text editor.
>> My idea was to override ProcessDialogKey to handle command keys, such as
> the
>> arrow or delete
>> and to override OnKeyPress to get char typed.
>>
>> Now I discover a few weird issues:
>> - the space key don't trigger OnKeyPress
>> - the backspace key does trigger OnKeyPress (with '\b')
>>
>> is it something normal (why is that) and stable (I could rely on next
>> version to be like that as well)?
>>
>>
>
>

11 Nov 2005 11:56 AM

S.M. Altaf [MVP]

Hi,

Can you show us the code you're using to override the ProcessDialogKey
function?

-Altaf

--------------------------------------------------------------------------------
All that glitters has a high refractive index.
www.mendhak.com

Show quote

"Lloyd Dupont" <net.galador@ld> wrote in message
news:OQJIFfo5FHA.2576@TK2MSFTNGP09.phx.gbl...
> I'm writing a custom Text editor.
> My idea was to override ProcessDialogKey to handle command keys, such as
> the arrow or delete
> and to override OnKeyPress to get char typed.
>
> Now I discover a few weird issues:
> - the space key don't trigger OnKeyPress
> - the backspace key does trigger OnKeyPress (with '\b')
>
> is it something normal (why is that) and stable (I could rely on next
> version to be like that as well)?
>

11 Nov 2005 6:02 PM

Gabriel Lozano-Morán

If you create your own text editor you can override the ProcessCmdKey of the
control to have maximize control over all characters pressed

        private const int WM_KEYDOWN = 0x100;
        private const int WM_SYSKEYDOWN = 0x104;

        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            if (msg.Msg == WM_KEYDOWN || msg.Msg == WM_SYSKEYDOWN)
            {
                switch (keyData)
                {
                    case Keys.Control | Keys.A: // Do some action on key
combination Ctrl + A
                        {
                            Console.WriteLine("Control + A");
                            break;
                        }
                    default:
                        {
                            Console.WriteLine(keyData.ToString());
                            break;
                        }
                }
            }

            return base.ProcessCmdKey(ref msg, keyData);
        }

Gabriel Lozano-Morán
MCSD .NET
Real Software

11 Nov 2005 8:30 PM

Lloyd Dupont

I do just that for control keys such as Arrows, backspace, up/down, etc...
But I need OnKeyPress for text entering as the argument is a unicode char I
assume it does the complex imput stuff which transform whatever key the user
input to the expected international unichar (european acent, thai, chineese,
arabic, etc..).

Show quote

"Gabriel Lozano-Morán" <gabriel.lozano@no-spam-thx.org> wrote in message
news:%23RXGFou5FHA.1864@TK2MSFTNGP12.phx.gbl...
> If you create your own text editor you can override the ProcessCmdKey of
> the control to have maximize control over all characters pressed
>
>        private const int WM_KEYDOWN = 0x100;
>        private const int WM_SYSKEYDOWN = 0x104;
>
>        protected override bool ProcessCmdKey(ref Message msg, Keys
> keyData)
>        {
>            if (msg.Msg == WM_KEYDOWN || msg.Msg == WM_SYSKEYDOWN)
>            {
>                switch (keyData)
>                {
>                    case Keys.Control | Keys.A: // Do some action on key
> combination Ctrl + A
>                        {
>                            Console.WriteLine("Control + A");
>                            break;
>                        }
>                    default:
>                        {
>                            Console.WriteLine(keyData.ToString());
>                            break;
>                        }
>                }
>            }
>
>            return base.ProcessCmdKey(ref msg, keyData);
>        }
>
>
> Gabriel Lozano-Morán
> MCSD .NET
> Real Software
>

14 Nov 2005 4:02 AM

Lloyd Dupont

found it.
for some reason base.ProcessDialogKeys(keyData) was returning true.
I just don't call base.ProcessDialogKeys() anymore.

Could that be a problem?

Show quote

"Lloyd Dupont" <net.galador@ld> wrote in message
news:OQJIFfo5FHA.2576@TK2MSFTNGP09.phx.gbl...
> I'm writing a custom Text editor.
> My idea was to override ProcessDialogKey to handle command keys, such as
> the arrow or delete
> and to override OnKeyPress to get char typed.
>
> Now I discover a few weird issues:
> - the space key don't trigger OnKeyPress
> - the backspace key does trigger OnKeyPress (with '\b')
>
> is it something normal (why is that) and stable (I could rely on next
> version to be like that as well)?
>