BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Deriving TEdit (TEditNumber)          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message Matrix Guest Posted: Tue Jul 20, 2004 12:08 pm    Post subject: Deriving TEdit (TEditNumber) Hi, I'm writing a new component descendind from TEdit which accepts only numbers. This component has a new property MaxValue (int type). I'd like to check after every keystroke, that the edit's content never overcomes this value. I tried to wrap the DoKeyDown, DoKeyPress, DoKeyUp functions but the edit's content still hasn't been updated yet, so when I check the content it still has the previous value. Have yuo got any advice to check the edit's content using the keyboard???? Back to top Remy Lebeau (TeamB) Guest Posted: Tue Jul 20, 2004 6:45 pm    Post subject: Re: Deriving TEdit (TEditNumber) "Matrix" <f_l_a_v_i_o.ba.ri.so.ne (AT) el_s_a_g (DOT) it> wrote Quote: This component has a new property MaxValue (int type). Why not just use TCSpinEdit? It already does all of that. Quote: I tried to wrap the DoKeyDown, DoKeyPress, DoKeyUp functions but the edit's content still hasn't been updated yet, so when I check the content it still has the previous value. That is fine. Simply retreive the current value into a separate AnsiString, then append the new key to it, then test the new value. Gambit Back to top Matrix Guest Posted: Wed Jul 21, 2004 7:00 am    Post subject: Re: Deriving TEdit (TEditNumber) Quote: I tried to wrap the DoKeyDown, DoKeyPress, DoKeyUp functions but the edit's content still hasn't been updated yet, so when I check the content it still has the previous value. That is fine. Simply retreive the current value into a separate AnsiString, then append the new key to it, then test the new value. The problem is that you can insert a new number in any place inside the Edit's content not only at the end. I mean: if the Edit's content is 1023 and the caret position (for any reason) is between 0 and 2, and you press "5", the whole number to check (to know if it's over the Max) is 10523 and not 10235. Have you got any idea to solve this problem without writing hundred of lines of code???? TIA. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jul 21, 2004 7:17 am    Post subject: Re: Deriving TEdit (TEditNumber) "Matrix" <f_l_a_v_i_o.ba.ri.so.ne (AT) el_s_a_g (DOT) it> wrote Quote: The problem is that you can insert a new number in any place inside the Edit's content not only at the end. Retreive the current caret position and then insert the keystroke into that position of the AnsiString. Gambit Back to top Matrix Guest Posted: Wed Jul 21, 2004 9:03 am    Post subject: Re: Deriving TEdit (TEditNumber) "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote: Quote: "Matrix" <f_l_a_v_i_o.ba.ri.so.ne (AT) el_s_a_g (DOT) it> wrote in message news:40fe1483$1 (AT) newsgroups (DOT) borland.com... The problem is that you can insert a new number in any place inside the Edit's content not only at the end. Retreive the current caret position and then insert the keystroke into that position of the AnsiString. OK...but I don't know how to find the caret position..sigh Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jul 21, 2004 5:14 pm    Post subject: Re: Deriving TEdit (TEditNumber) "Matrix" <f_l_a_v_i_o.ba.ri.so.ne (AT) el_s_a_g (DOT) it> wrote Quote: OK...but I don't know how to find the caret position. Use the SelStart property. Gambit Back to top Yoann chaigneau Guest Posted: Fri Jul 23, 2004 1:12 pm    Post subject: Re: Deriving TEdit (TEditNumber) Hi, Why don't you test the whole text of your edit in the onchage event ? "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> a écrit dans le message de news:40fea440 (AT) newsgroups (DOT) borland.com... Quote: "Matrix" <f_l_a_v_i_o.ba.ri.so.ne (AT) el_s_a_g (DOT) it> wrote in message news:40fe316e$2 (AT) newsgroups (DOT) borland.com... OK...but I don't know how to find the caret position. Use the SelStart property. 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