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.NET Forum / Languages / VB.NET / October 2007Detect when a form opens
Hi All I have an on-screen keyboard within a POS program I have written in VB.net 2005, for touch screen computers I have it set to 'always on top' so the user can move the cursor to different text boxes and type using the on-screen keyboard The keyboard launches via the mouseclick event for any text box If another form is launched, with the onscreen keyboard still visible, the on-screen keyboard cannot be closed as the new form is opened modally and will not release focus Is there an event which captures when any form loads so I can close the on-screen keyboard first? Any other ideas other than putting code in every forms load event? Regards Steve Hi Steve, Based on my understanding, you have a WinForm application and want to get notified when any form is going to be shown, so that you could close the on-screen keyboard first. If I'm off base, please feel free to let me know. I would say that there may no such an event which captures when any form loads. A workaround to your question is to detect whether the on-screen keyboard is visible or not when a new form is going to be shown modally. If yes, close the on-screen keyboard first and then show this new form. Hope this helps. If you have any question, please feel free to let me know. Sincerely, Linda Liu Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights. Hi Linda Thanks for the reply Further to this Is there a way to have a modeless topmost form (on screen keyboard) still accept input (or at least fire an event when clicked) when a modal form is opened with the modeless form already open? I am looking for a way to put the code, to close the topmost form, in the topmost form rather than having to put code in every form load event to check if the topmost form is open then close it, as I have many forms in my application If so this would solve my issue Regards Steve > Hi Steve, > [quoted text clipped - 36 lines] > This posting is provided "AS IS" with no warranties, and confers no > rights. Hi Linda Further to this I tested the on-screen keyboard that comes with windows XP and it is still active when I open a modal form from another modal form within my program Maybe it is because it is a seperate application Would running my onscreen keyboard in a different thread give the same behaviour, or do I need to to have my onscreen keyboard as a seperate application? Regards Steve > Hi Steve, > [quoted text clipped - 36 lines] > This posting is provided "AS IS" with no warranties, and confers no > rights. Hi Steve, Thank you for your prompt reply! >Is there a way to have a modeless topmost form (on screen keyboard) still accept input (or at least fire an event when clicked) when a modal form is opened with the modeless form already open? As you have mentioned, you could show the screen keyboard form in a seperate thread to get the above behavior. The following is a sample to do this: public partial class Form1 : Form { delegate void ShowKeyBoardDelegate(); private void Form1_Load(object sender, EventArgs e) { ShowKeyBoardDelegate dele = new ShowKeyBoardDelegate(ShowKeyBoard); // With the call to the BeginInvoke method of the delegate, the ShowKeyBoard method will be execute in a seperate thread within the application thread pool dele.BeginInvoke(null, null); } private void ShowKeyBoard() { Form2 frm = new Form2(); frm.TopMost = true; Application.Run(frm); } } I don't suggest you to have the onscreen keyboard as a seperate application, because this involves the intercommunicate between two application, which will definitely add complication. >I am looking for a way to put the code, to close the topmost form, in the topmost form rather than having to put code in every form load event to check if the topmost form is open then close it, as I have many forms in my application You can create a base form in your application and in its Load event handler, check if the onscreen keyboard form is open and if yes, close it. You need to derive all other forms(except the onscreen keyboard form) in your application from this base form. Thus, when each derived form is loaded, it will check if the onscreen keyboard form is open and you needn't add code to every form to check this. Hope this helps. If you have any question, please feel free to let me know. Sincerely, Linda Liu Microsoft Online Community Support Hi Linda Thanks for the great reply Very much appreciated Regards Steve > Hi Steve, > [quoted text clipped - 52 lines] > Linda Liu > Microsoft Online Community Support Heya Steve, I'm not sure if this will help at all - BUT you can Override the OnLoad method in your forms to handle additional logic that needs to be done <code> Protected Overrides Sub OnLoad(ByVal e As System.EventArgs) 'Call your method to hide the keyboard BEFORE MyBase is called MyBase.OnLoad(e) End Sub </code> Although depending on how you developed the system you could possibly create an overload for the form constructors and ensure the on screen keyboard is closed before continuing. Possibly pass a Boolean to the overload to signify that the keyboard is still visible and handle the logic from there... <code> Public Sub New(ByVal keyboardVisible As Boolean) InitializeComponent() hideKeyboard(keyboardVisible) End Sub Private Sub hideKeyboard(ByVal keyboardVisible As Boolean) If keyboardVisible Then 'Do your magic :) End If End Sub </code> HTH Brendon > Hi All > [quoted text clipped - 16 lines] > Regards > Steve Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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