How to catch a key down event in TextEdit UI element ?
Is it possible for me to catch 'Enter' and 'Esc' key when I input something ?
Best regads ,
hi, Shishir ,
I see the on key event in input field , yes , the TextEdit does not has any event . But how can I meet such requirement ?
When the user click enter on TextEdit , I should do something , When the user click escape , I should do something ?
Best regards ,
Similar Messages
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InsertionPalette activex control key down event
Hi,
Can any one know how to get the key down event of InsertionPalette activex control.
I have handled the KeyDownEvent but it is not fired while the control is active and key is pressed.
regards,
CeaserCeaser,
what is the application developement environment you are working with?
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it. -
How to separate "Key down" event from panel and numerical control
Hi, All
I have a vi proecess key down events for panel and a numerical control in this panel. the application will do:
1. when panel is focused, user can use "up" and "down" key to driver some hardware.
2. when the numerical control has the focus, "up" and "down" key will change it's value as usual.
somehow the second one did not work, because the panel "key down" event was trigger as well when I use "up' "down" key inise the numerical control.
then I used "Key down?" of numerical control to block the "up/down" key. But the first time when I run the Vi, the panel still got triggered one time.
any suggestions on this? test code attached in this post too.
thanks
CQ
Solved!
Go to Solution.
Attachments:
KeyDown_Up_valuechange.vi 16 KBThis works for me in 2014. In short, you just need to check to see if your numeric has the focus. If it doesn't, then you process the key value. No need for any other event here except for the stop button.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
KeyDown_Up_valuechange_BD.png 32 KB -
Key down event handeling when the VI isn't active
Hi
I've written a simplel VI that increases or decreases a numerical indicator depending on which key is pressed on the keyboard. But this only works when the VI window is active (the titlebar is blue and not gray). Is there anyway to listen for the key-down event even though the VI is not active?
In advance thanks
GeorgI recently ran into a problem with the Acquire Data.
See http://forums.ni.com/ni/board/message?board.id=170&message.id=147363
Just in case.... -
Is there a way to make the key down event in the wait event structure run in the background when labview is not the focus? Also what is the difference between the "key down? event" and the "key down event"? I couldn't find a good answer in the LabVIEW help.
tst wrote:
To expand a bit on RF's answer, while you can't use the event structure to register for key down events in other windows, there are some potential options:
You could use the input VIs to poll the keyboard (and you can have a loop which will use a user event to send each new key to an event structure). The main problem with this (and it's a big one) is that it is unreliable. You would have to poll quickly enough (probably at ~20-50 Hz) to have a decent chance of being sure that you're not missing keys and even then it's not guaranteed. The other problem is that you don't know which window was actually in focus.
You could try getting the window messages from the other window. I have no real experience with Windows messaging, but my understanding is that this will probably require you to write a custom hook in C to get it, but it's possible that this is also possible with the standard Win32 API functions. Even if it is, this is probably not something you want to get into to, but you could try looking it up.
Actually this Windows Messaging already exists in LabVIEW:
http://zone.ni.com/devzone/cda/epd/p/id/4394
However there is a few issues. It only partially works in Windows 64-bit, and you have to know the handle to the application that you want to intercept key downs for. I did a quick test and I was able to detect the KEYDOWN event in another VI that was running for for some reason got an error when I tried to get keydown on notepad. This method would eliminate polling if you can get it to work, and because of this you shouldn't miss any key presses.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously. -
Hi,
I've been working on code for handling a flash-plugin inside an existing application, and have been looking at getting the flash player working with the Cocoa/CoreGraphics API.
Thus far, I have plugin loading, focus, mouse handling events all working. But then key events don't work consistently - on some flash applications, the key down events work, but on most they return a '1' but the flash app doesn't respond.
This is most odd, and a pretty esoteric type of work - I don't know many people who get this kind of work, and it's hard finding people who can share their experiences of this.
I've been going through the NPAPI docs on the mozilla website and copying a lot of the handling code in WebKit, Chromium and Firefox, but none of it seems to help any more - my handling code works the same way as that does, but the responses for key down events are different.
So, this is just a last try before I go crazy - has anyone ever seen anything like this before?
Thanks,
Tom.Well, it is a problem with Flash Player and not Flash. I don't need an experienced Flash developer.
Seriously though, the nature of the question is so esoteric that I doubt there are many developers anywhere who could give much advice.
Thanks anyway. -
Detecting external keyboard Key Down Events in Ipad2 without EditText Field.
I am trying to detect key pressed for an external keyboard (bluetooth) in IPad2 , I was only able to do so when the focus is on EditText Field.
Without the edit text field , the key down events are not captured by the program . Is there any work around for this issue .I am trying to detect key pressed for an external keyboard (bluetooth) in IPad2 , I was only able to do so when the focus is on EditText Field.
Without the edit text field , the key down events are not captured by the program . Is there any work around for this issue . -
I have a plugin which presents a dialog and does some keyboard input,
and under mac/cs3 ONLY, indesign is capturing and acting upon key
down events before the plugin sees them.
Oddly, key UP events are being passed through normally.
These events are being delivered to the plugin by the
mac toolbox function WaitNextEvent.
Is this a known problem?The last time I read about the Mac event manager, WaitNextEvent was deprecated in favour of carbon events. Maybe InDesign now also follows this path.
http://developer.apple.com/documentation/Carbon/Conceptual/Carbon_Event_Manager/Concept/ch apter_2_section_4.html
Anyway, bypassing InDesign in order to invoke WNE is bad style. Make yourself familiar with IEventHandler and alike.
> Is this a known problem?
If you're working at Extensis then at least one of your users now has found the problem ... . Could be a different reason though, I just saw this post:
Jeremy Paine, "ID CS3 Control Palette Oddity" #10, 17 Sep 2007 8:33 pm
Dirk -
When is Key down event case triggered
Hi all,
In event structure there is an event <this VI> key Down?
When will this event be triggered... i.e will this event be triggered only in case of a keyboard entry... ?
Or in case i use a barcode reader, if data gets populated in a control on the Front panel through the barcode reader will this trigger this event...?
ThanksThe Key Down event will only be fired when a key is pressed on the keyboard. If you want to fire an event off of a Front panel control, you can either use a User Event or a property node called Value (Signaling). This property node will cause a Value Change event to trigger when the value of the Front panel control changes.
Cheers -
Key down event to start something an stop arbirtrary
hallo,
what I'm trying to do is to start an event on key down an do a loop , something like move an axis for CNC , and this until i press an arbitrary key again.
i have already a while loop an an event structure so it would be good just to add something withtout large modifications.
have anyone an example code for me , please.
i've looked already in a lots of posts but i can't find anything usefull for me.
many thanks in advanceagain - lots of ways to do this.
The attached example is just the fastest I could modify the previous version
2006 Ultimate LabVIEW G-eek.
Attachments:
keydownvi3.vi 53 KB -
How to binding a key press event of "Esc" to "cancle" button
I create a class extended JComponent. Than I add a button named "cancle " to it.
Than I add the class's instance to a JDialog object.
I try to get the key press event through add a keyListener to the class instance, but no works.
I try to add a keymap and action map to the dialog 's getRootPane() also no works.
Who can tell me how can I do?Thats the way I did it:
// map escape key
ActionListener escapeActionListener = new ActionListener()
public void actionPerformed(ActionEvent e)
cancelPressed();
this.registerKeyboardAction( escapeActionListener,
KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, false),
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT ); -
How to Catch External device's Event
hi frndz
i connected Dental Web Camera in my PC.i want to capture his click event.can i capture its click event.
or any other way to catch its generated event.
actually i want to store picture(Taken from Camera) into database.
can u help me to solve this problem or can u provide me any solution
thanks in advance
Edited by: ajju29 on Mar 20, 2009 2:40 AMIMO:
If Your camera don't ofer any SDK, you should check OS API and next search how catch events in your OS.
if you develop for windows, check msdn.microsoft.com
this links i find in google, maybe can help you"
http://www.velocityreviews.com/forums/t130113-swing-how-to-catch-all-events.html
http://www.experts-exchange.com/Programming/Languages/Java/J2SE/Q_23643749.html *(you must pay)
http://www.javareference.com/jrexamples/viewexample.jsp?id=9
http://www.microdoc.com/download/EDFoop2000_EN.pdf
and more,
ask google.
Edited by: Skowroniasty on Mar 20, 2009 10:52 AM -
How to catch cell lost focuse event of matrix
Dear all
can you tell me how to catch the cell lost fouc event of matrix.
i want to check the value is entered the that cell, which is not greter than the extising value..
thanks in advance......Hi
For that you can use either validate or lost focus event
Private Sub SBO_Application_ItemEvent(ByVal FormUID As String, ByRef pVal As SAPbouiCOM.ItemEvent, ByRef BubbleEvent As Boolean) Handles SBO_Application.ItemEvent
' BubbleEvent sets the behavior of SAP Business One.
' False means that the application will not continue processing this event.
' Validate event
If (pVal.FormType = 133) And (pVal.ItemUID = 38) And (pVal.ColUID = 1) And _
(pVal.EventType = SAPbouiCOM.BoEventTypes.et_VALIDATE) Then
If (pVal.Before_Action) Then
'write your code
End If
End If
'Lost focus event
If (pVal.FormType = 133) And (pVal.ItemUID = 38) And (pVal.ColUID = 1) And _
(pVal.EventType = SAPbouiCOM.BoEventTypes.et_LOST_FOCUS) Then
If (pVal.Before_Action) Then
'write your code
End If
End If
End Sub
Hope this helps
Regards
Arun -
How to catching Clear-Sort button event?
Does any one know how to catch the event when user click the Clear-ALL-Sort button? I would like to do somthing in Java by catching this event.
thanks in advance.
JohnI'm not really sure what you mean.
LIke, I want to use the three event listener functions like a global or static function for all of the buttons which I think I've done for the most part.
However, I'm having an issue with the current state of the button. Like...
1 - on
2 - off
3 - off
4 - off
1 - off
2 - on
3 - off
4 - off
1 - off
2 - off
3 - on
4 - off
1 - off
2 - off
3 - off
4 - on
Really redundant right? So I want to beable to pass something through the event listener functions somehow so I only have to right the listener section once instead of 4 times.
Know what I mean? If I was in an external document class structure I could just re-create my own event listener class to pass aonther property/parameter. But I don't know what I can do within AS3 internally in the Flash movie to do this.
Just seems likes there should be a relatively simple way to do this, but I'm not sure how many errors I'd have to wade through or if it's even possible. -
How to catch Find and add event of toolbar in UDO addon ?
Hi experts ,
please help me anyone How can i catch Find and add event of SAP toolbar in my UDO addon ?
thanks in advance
SurajitHi,
Try This.....
'In Menu Event
If pVal.MenuUID = "1281" And pVal.BeforeAction = True Then 'Find
sbo_application.Messagebox("Find Mode")
end if
If pVal.MenuUID = "1282" And pVal.BeforeAction = True Then 'Add
sbo_application.Messagebox("Add Mode")
end if
Thanks
Shafi
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