Hover effects, IMessageFilter not working as expected

**Bryan Phillips** · Oct 27 '06, 01:35 AM

Re: Hover effects, IMessageFilter not working as expected

Have you tried using the Activated and Deactivated events instead? See
this from MSDN help:

The Enter and Leave events are suppressed by the Form class. The
equivalent events in the Form class are the Activated and Deactivate
events. The Enter and Leave events are hierarchical and will cascade up
and down the parent chain until the appropriate control is reached. For
example, assume you have a Form with two GroupBox controls, and each
GroupBox control has one TextBox control. When the caret is moved from
one TextBox to the other, the Leave event is raised for the TextBox and
GroupBox, and the Enter event is raised for the other GroupBox and
TextBox.

Bryan Phillips
MCSD, MCDBA, MCSE
Blog: http://bphillips76.spaces.live.com

"ThunderMus ic" <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
news:eh#7bOT#GH A.3456@TK2MSFTN GP02.phx.gbl:

Hi,
I'm developping a form that renders differently when hovered and trigger
some processing when not hovered (leaved). The thing is, when I leave my
form and another form from my application is underneath, it works fine, but
if I leave my form and anything that is not from my application is
underneath, the Leave event does not fire until I hover something from my
application.
>
Here's my filtered code for the IMessageFilter (I did not pasted the
declarations, I just pasted my message proc) (at the end of the post)
>
Can someone tell me what's wrong with this code?
>
thanks
>
ThunderMusic
>

Code:

public bool PreFilterMessage(ref Message m)
{
    // Everything is done with WM_MOUSEMOVE
    if (m.Msg == WM_MOUSEMOVE)
    {
        // look if the target is our control or contained by our control
        Control ctrl = Control.FromHandle(m.HWnd);
        if (ctrl != null && (ctrl == this._container ||
this._container.Contains(ctrl)))
        {
            // if this message WM_MOUSEMOVE is the first we get,
            // we must trigger the MouseEnter event
            if (!this._isEntered)
            {
                // trigger MouseEnter
                this.OnMouseEnter();
                this._isEntered = true;
            }
            // Get point (using target control coordinates)
            Point pt = new Point(m.LParam.ToInt32());
            // convert to controls coordinates if necessary
            Point containerPoint;
            if (ctrl != this._container)
                containerPoint =
this._container.PointToClient(ctrl.PointToScreen(pt));
            else
                containerPoint = pt;
            // Trigger MouseMove
            this.OnMouseMove(new MouseEventArgs(MouseButtons.None, 0,
containerPoint.X, containerPoint.Y, 0));
        }
        else
        {
            // If the target is not a child and MouseLeaves has not been
triggered
            // we must trigger MouseLeave
            if (this._isEntered)
            {
                // Trigger MouseLeave
                this.OnMouseLeave();
                this._isEntered = false;
            }
        }
    }
    return false;
}

**ThunderMusic** · Oct 27 '06, 12:25 PM

Re: Hover effects, IMessageFilter not working as expected

hi, thanks for your answer... unfortunately, it's not exactly what I
need... Activate and Deactivate are triggered when a user clicks on a form
(activated) or click on another form or minimize (Deactivate)... The
behavior I need is when the user move his mouse over the form or out of the
form...

I agree that the MouseEnter and MouseLeave of the form are hierarchical,
that's why I did implement IMessageFilter. ... Now the thing is, I must
discover how to receive the message (or event) so the program can tell when
the mouse cursor went out of the form's boundaries.

Thanks

ThunderMusic

"Bryan Phillips" <bphillips@nosp am.crowechizek. com.spammenotwr ote in
message news:O7NrmmW%23 GHA.4468@TK2MSF TNGP05.phx.gbl. ..

Have you tried using the Activated and Deactivated events instead? See
this from MSDN help:
>
The Enter and Leave events are suppressed by the Form class. The
equivalent events in the Form class are the Activated and Deactivate
events. The Enter and Leave events are hierarchical and will cascade up
and down the parent chain until the appropriate control is reached. For
example, assume you have a Form with two GroupBox controls, and each
GroupBox control has one TextBox control. When the caret is moved from one
TextBox to the other, the Leave event is raised for the TextBox and
GroupBox, and the Enter event is raised for the other GroupBox and
TextBox.
>
Bryan Phillips
MCSD, MCDBA, MCSE
Blog: http://bphillips76.spaces.live.com
>
>
>
>
"ThunderMus ic" <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
news:eh#7bOT#GH A.3456@TK2MSFTN GP02.phx.gbl:
>

>Hi,
>I'm developping a form that renders differently when hovered and trigger
>some processing when not hovered (leaved). The thing is, when I leave my
>form and another form from my application is underneath, it works fine,
>but
>if I leave my form and anything that is not from my application is
>underneath, the Leave event does not fire until I hover something from my
>application.
>>
>Here's my filtered code for the IMessageFilter (I did not pasted the
>declarations , I just pasted my message proc) (at the end of the post)
>>
>Can someone tell me what's wrong with this code?
>>
>thanks
>>
>ThunderMusic
>>
>

Code:

>public bool PreFilterMessage(ref Message m)
>{
>    // Everything is done with WM_MOUSEMOVE
>    if (m.Msg == WM_MOUSEMOVE)
>    {
>        // look if the target is our control or contained by our control
>        Control ctrl = Control.FromHandle(m.HWnd);
>        if (ctrl != null && (ctrl == this._container ||
>this._container.Contains(ctrl)))
>        {
>            // if this message WM_MOUSEMOVE is the first we get,
>            // we must trigger the MouseEnter event
>            if (!this._isEntered)
>            {
>                // trigger MouseEnter
>                this.OnMouseEnter();
>                this._isEntered = true;
>            }
>            // Get point (using target control coordinates)
>            Point pt = new Point(m.LParam.ToInt32());
>            // convert to controls coordinates if necessary
>            Point containerPoint;
>            if (ctrl != this._container)
>                containerPoint =
>this._container.PointToClient(ctrl.PointToScreen(pt));
>            else
>                containerPoint = pt;
>            // Trigger MouseMove
>            this.OnMouseMove(new MouseEventArgs(MouseButtons.None, 0,
>containerPoint.X, containerPoint.Y, 0));
>        }
>        else
>        {
>            // If the target is not a child and MouseLeaves has not been
>triggered
>            // we must trigger MouseLeave
>            if (this._isEntered)
>            {
>                // Trigger MouseLeave
>                this.OnMouseLeave();
>                this._isEntered = false;
>            }
>        }
>    }
>    return false;
>}
>

>

**Stoitcho Goutsev \(100\)** · Oct 27 '06, 05:35 PM

Re: Hover effects, IMessageFilter not working as expected

Hi,

Here is your problem. You are using MouseMove event which is based on
WM_MOUSEMOVE. This message as any other mouse messages are posted to the
window under the mouse cursor. Because you use message filter you receive
this message if the mouse is over any form (control) that belongs to your
application. However when the mouse moves over window that is not part of
your application we just stop receiving mouse messages and there is no
notification when this happens they just stop. Windows have three solutions
to the problem (at least these are the ones that I can come up with at the
moment): installing window hook WH_MOUSE_LL, using TrackMouseEvent API and
setting mouse capture.

- WH_MOUSE_LL are possible to be implemented in .NET, but it requires using
PInvoke and I think it is the hardest one to implement
- Setint the mouse capture means that the mouse message will be dispatched
to your window even when the mouse cursor is outside of the window. The
problem is that it works only if mouse button has been pressed when the
mouse is inside the window is held down while moving the mouse. WindowsForms
sets the mouse capture when the mouse button is pressed, so it should work
by itself, but if it doesn't work for you that means you want to register
mouse leave not only when the mouse button is down.
- TrackMouseEvent is used internaly by Windows forms and the functionality
is exposed as MouseLeave and MouseHover events. Why don't use these events
instead of implementing your own solution?
The only problem that I see is that you are going to receive mouse leave
even if the mouse is inside the form, but enters some form's child control.
This cases can be filtered our by checking the form hosting tghe control.
The WM_MOUSELEAVE used internally is posted to the message queue, thus can
be handeled with message filter

--
HTH
Stoitcho Goutsev (100)

"ThunderMus ic" <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
news:OtNY$Wc%23 GHA.1196@TK2MSF TNGP02.phx.gbl. ..

hi, thanks for your answer... unfortunately, it's not exactly what I
need... Activate and Deactivate are triggered when a user clicks on a
form (activated) or click on another form or minimize (Deactivate)... The
behavior I need is when the user move his mouse over the form or out of
the form...
>
I agree that the MouseEnter and MouseLeave of the form are hierarchical,
that's why I did implement IMessageFilter. ... Now the thing is, I must
discover how to receive the message (or event) so the program can tell
when the mouse cursor went out of the form's boundaries.
>
Thanks
>
ThunderMusic
>
"Bryan Phillips" <bphillips@nosp am.crowechizek. com.spammenotwr ote in
message news:O7NrmmW%23 GHA.4468@TK2MSF TNGP05.phx.gbl. ..

>Have you tried using the Activated and Deactivated events instead? See
>this from MSDN help:
>>
>The Enter and Leave events are suppressed by the Form class. The
>equivalent events in the Form class are the Activated and Deactivate
>events. The Enter and Leave events are hierarchical and will cascade up
>and down the parent chain until the appropriate control is reached. For
>example, assume you have a Form with two GroupBox controls, and each
>GroupBox control has one TextBox control. When the caret is moved from
>one TextBox to the other, the Leave event is raised for the TextBox and
>GroupBox, and the Enter event is raised for the other GroupBox and
>TextBox.
>>
>Bryan Phillips
>MCSD, MCDBA, MCSE
>Blog: http://bphillips76.spaces.live.com
>>
>>
>>
>>
>"ThunderMusi c" <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
>news:eh#7bOT#G HA.3456@TK2MSFT NGP02.phx.gbl:
>>

>>Hi,
>>I'm developping a form that renders differently when hovered and trigger
>>some processing when not hovered (leaved). The thing is, when I leave my
>>form and another form from my application is underneath, it works fine,
>>but
>>if I leave my form and anything that is not from my application is
>>underneath, the Leave event does not fire until I hover something from
>>my
>>application .
>>>
>>Here's my filtered code for the IMessageFilter (I did not pasted the
>>declaration s, I just pasted my message proc) (at the end of the post)
>>>
>>Can someone tell me what's wrong with this code?
>>>
>>thanks
>>>
>>ThunderMusi c
>>>
>>

Code:

>>public bool PreFilterMessage(ref Message m)
>>{
>>    // Everything is done with WM_MOUSEMOVE
>>    if (m.Msg == WM_MOUSEMOVE)
>>    {
>>        // look if the target is our control or contained by our control
>>        Control ctrl = Control.FromHandle(m.HWnd);
>>        if (ctrl != null && (ctrl == this._container ||
>>this._container.Contains(ctrl)))
>>        {
>>            // if this message WM_MOUSEMOVE is the first we get,
>>            // we must trigger the MouseEnter event
>>            if (!this._isEntered)
>>            {
>>                // trigger MouseEnter
>>                this.OnMouseEnter();
>>                this._isEntered = true;
>>            }
>>            // Get point (using target control coordinates)
>>            Point pt = new Point(m.LParam.ToInt32());
>>            // convert to controls coordinates if necessary
>>            Point containerPoint;
>>            if (ctrl != this._container)
>>                containerPoint =
>>this._container.PointToClient(ctrl.PointToScreen(pt));
>>            else
>>                containerPoint = pt;
>>            // Trigger MouseMove
>>            this.OnMouseMove(new MouseEventArgs(MouseButtons.None, 0,
>>containerPoint.X, containerPoint.Y, 0));
>>        }
>>        else
>>        {
>>            // If the target is not a child and MouseLeaves has not been
>>triggered
>>            // we must trigger MouseLeave
>>            if (this._isEntered)
>>            {
>>                // Trigger MouseLeave
>>                this.OnMouseLeave();
>>                this._isEntered = false;
>>            }
>>        }
>>    }
>>    return false;
>>}
>>

>>

>
>

**ThunderMusic** · Oct 28 '06, 04:05 AM

Re: Hover effects, IMessageFilter not working as expected

Great, it seems to work fine now by filtering on the WM_MOUSELEAVE message
in my MessageFilter.

Thanks a lot

ThunderMusic

"Stoitcho Goutsev (100)" <100@100.coma écrit dans le message de news:
%23jIU3Ef%23GHA .1196@TK2MSFTNG P02.phx.gbl...

Hi,
>
Here is your problem. You are using MouseMove event which is based on
WM_MOUSEMOVE. This message as any other mouse messages are posted to the
window under the mouse cursor. Because you use message filter you receive
this message if the mouse is over any form (control) that belongs to your
application. However when the mouse moves over window that is not part of
your application we just stop receiving mouse messages and there is no
notification when this happens they just stop. Windows have three
solutions to the problem (at least these are the ones that I can come up
with at the moment): installing window hook WH_MOUSE_LL, using
TrackMouseEvent API and setting mouse capture.
>
- WH_MOUSE_LL are possible to be implemented in .NET, but it requires
using PInvoke and I think it is the hardest one to implement
- Setint the mouse capture means that the mouse message will be dispatched
to your window even when the mouse cursor is outside of the window. The
problem is that it works only if mouse button has been pressed when the
mouse is inside the window is held down while moving the mouse.
WindowsForms sets the mouse capture when the mouse button is pressed, so
it should work by itself, but if it doesn't work for you that means you
want to register mouse leave not only when the mouse button is down.
- TrackMouseEvent is used internaly by Windows forms and the
functionality is exposed as MouseLeave and MouseHover events. Why don't
use these events instead of implementing your own solution?
The only problem that I see is that you are going to receive mouse leave
even if the mouse is inside the form, but enters some form's child
control. This cases can be filtered our by checking the form hosting tghe
control. The WM_MOUSELEAVE used internally is posted to the message queue,
thus can be handeled with message filter
>
>
--
HTH
Stoitcho Goutsev (100)
>
"ThunderMus ic" <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
news:OtNY$Wc%23 GHA.1196@TK2MSF TNGP02.phx.gbl. ..

>hi, thanks for your answer... unfortunately, it's not exactly what I
>need... Activate and Deactivate are triggered when a user clicks on a
>form (activated) or click on another form or minimize (Deactivate)...
>The behavior I need is when the user move his mouse over the form or out
>of the form...
>>
>I agree that the MouseEnter and MouseLeave of the form are hierarchical,
>that's why I did implement IMessageFilter. ... Now the thing is, I must
>discover how to receive the message (or event) so the program can tell
>when the mouse cursor went out of the form's boundaries.
>>
>Thanks
>>
>ThunderMusic
>>
>"Bryan Phillips" <bphillips@nosp am.crowechizek. com.spammenotwr ote in
>message news:O7NrmmW%23 GHA.4468@TK2MSF TNGP05.phx.gbl. ..

>>Have you tried using the Activated and Deactivated events instead? See
>>this from MSDN help:
>>>
>>The Enter and Leave events are suppressed by the Form class. The
>>equivalent events in the Form class are the Activated and Deactivate
>>events. The Enter and Leave events are hierarchical and will cascade up
>>and down the parent chain until the appropriate control is reached. For
>>example, assume you have a Form with two GroupBox controls, and each
>>GroupBox control has one TextBox control. When the caret is moved from
>>one TextBox to the other, the Leave event is raised for the TextBox and
>>GroupBox, and the Enter event is raised for the other GroupBox and
>>TextBox.
>>>
>>Bryan Phillips
>>MCSD, MCDBA, MCSE
>>Blog: http://bphillips76.spaces.live.com
>>>
>>>
>>>
>>>
>>"ThunderMusic " <NoSpAmdanlatat hotmaildotcom@N oSpAm.comwrote in message
>>news:eh#7bOT# GHA.3456@TK2MSF TNGP02.phx.gbl:
>>>
>>>Hi,
>>>I'm developping a form that renders differently when hovered and
>>>trigger
>>>some processing when not hovered (leaved). The thing is, when I leave
>>>my
>>>form and another form from my application is underneath, it works fine,
>>>but
>>>if I leave my form and anything that is not from my application is
>>>underneath , the Leave event does not fire until I hover something from
>>>my
>>>applicatio n.
>>>>
>>>Here's my filtered code for the IMessageFilter (I did not pasted the
>>>declarations , I just pasted my message proc) (at the end of the post)
>>>>
>>>Can someone tell me what's wrong with this code?
>>>>
>>>thanks
>>>>
>>>ThunderMus ic
>>>>
>>>

Code:

>>>public bool PreFilterMessage(ref Message m)
>>>{
>>>    // Everything is done with WM_MOUSEMOVE
>>>    if (m.Msg == WM_MOUSEMOVE)
>>>    {
>>>        // look if the target is our control or contained by our
>>>control
>>>        Control ctrl = Control.FromHandle(m.HWnd);
>>>        if (ctrl != null && (ctrl == this._container ||
>>>this._container.Contains(ctrl)))
>>>        {
>>>            // if this message WM_MOUSEMOVE is the first we get,
>>>            // we must trigger the MouseEnter event
>>>            if (!this._isEntered)
>>>            {
>>>                // trigger MouseEnter
>>>                this.OnMouseEnter();
>>>                this._isEntered = true;
>>>            }
>>>            // Get point (using target control coordinates)
>>>            Point pt = new Point(m.LParam.ToInt32());
>>>            // convert to controls coordinates if necessary
>>>            Point containerPoint;
>>>            if (ctrl != this._container)
>>>                containerPoint =
>>>this._container.PointToClient(ctrl.PointToScreen(pt));
>>>            else
>>>                containerPoint = pt;
>>>            // Trigger MouseMove
>>>            this.OnMouseMove(new MouseEventArgs(MouseButtons.None, 0,
>>>containerPoint.X, containerPoint.Y, 0));
>>>        }
>>>        else
>>>        {
>>>            // If the target is not a child and MouseLeaves has not
>>>been
>>>triggered
>>>            // we must trigger MouseLeave
>>>            if (this._isEntered)
>>>            {
>>>                // Trigger MouseLeave
>>>                this.OnMouseLeave();
>>>                this._isEntered = false;
>>>            }
>>>        }
>>>    }
>>>    return false;
>>>}
>>>

>>>

>>
>>

>
>

Hover effects, IMessageFilter not working as expected

Hover effects, IMessageFilter not working as expected

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