how do you tell if a key is pressed in mouse event?

[MrNobody]

Say I want to do a specific action if the user holds down the CTRL key while
clicking something in my UI- how can I determine if this key is currently
pressed within the mouse event?

[Chris R. Timmons]

"=?Utf-8?B?TXJOb2JvZHk =?=" <Mr******@discu ssions.microsof t.com>
wrote in news:3A******** *************** ***********@mic rosoft.com:

Say I want to do a specific action if the user holds down the
CTRL key while clicking something in my UI- how can I determine
if this key is currently pressed within the mouse event?

One way would be to use three events (OnKeyDown, OnKeyUp, and
OnMouse*), and a boolean class-wide variable.

Here's some pseudocode:
// Class-wide variable
private bool isControlKeyPre ssed = false;

OnKeyDown event:
if control key is pressed:
this.isControlK eyPressed = true;

OnKeyUp event:
if control key is being released:
this.isControlK eyPressed = false;

OnMouse* event (where * = enter, leave, move, etc...):
if this.isControlK eyPressed:
// do control key-related processing here.
--
Hope this helps.

Chris.
-------------
C.R. Timmons Consulting, Inc.
http://www.crtimmonsinc.com/

[Cor Ligthert]

MrNobody,

I am guessing that you want a way for draging controls (or whatever) over
your screen and therefore simple told.

Normally you set therefore a switch as the mousedown event occurs which you
set to off when the mouse up event occurs.

Than you can see in the mousemove event that it is down, and you can move an
object over your screen.

Just guessing,

Cor

"MrNobody" <Mr******@discu ssions.microsof t.com> schreef in bericht
news:3A******** *************** ***********@mic rosoft.com...

Say I want to do a specific action if the user holds down the CTRL key
while
clicking something in my UI- how can I determine if this key is currently
pressed within the mouse event?

[Morten Wennevik]

Hi MrNobody,

A Control has a handy static property called ModifierKeys that you can tap
into at any time.
So, in your mouseevent check

if((Control.Mod ifierkeys & Keys.Control) > 0)
//Ctrl is in a pressed state

Or if you only want to allow ctrl without any alt or shift use ==

--
Happy Coding!
Morten Wennevik [C# MVP]