BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  onStartDrag event ?          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message Dave Barcomb Guest Posted: Thu Jun 22, 2006 9:29 pm    Post subject: onStartDrag event ? I would like to drag items from a TMaskedit component, but not lose the edit capability. I actually have this working, but to get this to work I have to use the Mouse down event to set the beginDrag method to false. When I use the mouse down event I do NOT get an onStartDrag event even though my drag mode is dkDrag. Without an onStartDrag event I cannot create my drag object and image for the drag cursor. I have this all working using a button to switch from dmManual mode where my edit capability works and then using the button to switch to dmAutomatic mode where the drag works with an onStartDrag event. However, if I can get the onStartDrag event with the mouse down event in the dmManual mode then I can have everything working without a button. I have a Groupbox on a form that has a frame put into it and the frame contains rows of TPanels that are dynamically generated at run time. Inside these TPanels are dynamically generated TMaskEdit boxes that I am trying to work with above. The Frame is the parent of the Tpanels and the Tpanels are the Parents of the TMaskEdit boxes. I have seen some postings about Borland bugs with the onStartDrag event, but the bugs seemed a little different then the problem I am seeing. Any ideas on what to try or pointers to other onStartDrag bug info? Thanks Dave Barcomb Back to top JD Guest Posted: Fri Jun 23, 2006 3:32 am    Post subject: Re: onStartDrag event ? "Dave Barcomb" <vtmogulskier (AT) adelphia (DOT) net> wrote: Quote: [...] using a button to switch from dmManual mode where my edit capability works and then using the button to switch to dmAutomatic mode where the drag works Set the DragMode to dmManual and in the OnMouseDown event, call BeginDrag with the Imediate parameter set to false and some Threshold value. Another option is to record the click point in the OnMouseDown event and add an OnMouseMove event where you compare the click point with the current point and decide if your threshold has been reached and if so, call BeginDrag. Quote: I have seen some postings about Borland bugs with the onStartDrag event, No bugs - just buggy code. ~ JD Back to top Dave Barcomb Guest Posted: Fri Jun 23, 2006 6:36 pm    Post subject: Re: onStartDrag event ? JD wrote: Quote: dmAutomatic mode where the drag works Set the DragMode to dmManual and in the OnMouseDown event, call BeginDrag with the Imediate parameter set to false and some Threshold value. This is what I am doing now. I don't think I was as clear as I wanted to be. The problem is that when I do this I do not get an onStartDrag event. The event never happens. I set a breakpoint and the onStartDrag event only occurs when I set the drag mode to dmAutomatic. Thanks Dave Barcomb -- Back to top JD Guest Posted: Fri Jun 23, 2006 11:26 pm    Post subject: Re: onStartDrag event ? "Dave Barcomb" <vtmogulskier (AT) adelphia (DOT) net> wrote: Quote: [...] The problem is that when I do this I do not get an onStartDrag event. What is the Threshold parameters set to? Are you moving the mouse far enough to break the threshold to cause the event to be triggered? What does your actual code look like? ~ JD Back to top Dave Barcomb Guest Posted: Tue Jun 27, 2006 6:33 pm    Post subject: Re: onStartDrag event ? JD wrote: Quote: What is the Threshold parameters set to? Are you moving the mouse far enough to break the threshold to cause the event to be triggered? What does your actual code look like? The Threshold parameter is set to 5. I figured out what was happening. I get an onStartDrag event for the frame. I mentioned that I had a Frame with dynamically allocated Tpanel boxes which then have TmaskEdit boxes. When in DmAutomatic mode the TMaskEdit components get the onStartDrag event. However, in manual mode the onStartDrag event only goes to the frame which is the parent of the Tpanels. The Tpanel is the parent of the TMaskEdit components. I tested the TPanel and the onStartDrag event does not go there in dmManual mode. I think this is a known Borland Delphi bug. I found something while browsing one day, but I cannot find it again. How can I look up known Delphi bugs? The only problem I have with my work around is that I have to save a variable in the BeginDrag method so that I will have the component information that I need but do not get with the frame onStartDrag event. The frames are then put into a Tgroupbox. The code is pretty simple and I can post later if you think it's my bug and not Delphi. Thanks for the offer. I have been struggling with Delphi for 6 weeks now, and I'm starting to get the hang of it. It's really nice when it works right. I can create test apps really quickly now. 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