BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  ZOrder of Forms          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message Chris Guest Posted: Tue Apr 25, 2006 7:03 pm    Post subject: ZOrder of Forms Hi I'm struggling a bit with the window ZOrder in my app. The problem is that I need to display a window non-modally but this window occasionally shows modal forms. The non-modal form also must have a task bar button so that the user can easily switch between the main screen and the non-modal form. So to recap: Form1 (Main Form with taskbar button) Form2 (Non-Modal Form with taskbar button) Form3 (Modal Form called from Form2) If the user has all three screens open and is working in Form3 then the ZOrder (visually) looks like Form1 Form2 Form3 and there are two buttons on the task bar (Form1 , Form2). If the user swaps to another application and then back to mine by clicking on the taskbar buttons all works well if he uses Form1's taskbar button, i.e. the forms are still 'stacked' in the same order as when he left, but if he clicks on Form2's taskbar button then Form2 (which is disabled because Form3 is modal) comes to the front and hence the app appears to have locked (clicking between the taskbar buttons does bring the forms back into the 'correct' order eventually). i.e. Form1 Form3 Form2 To see this in action create a new application with three forms, add a button to form1 and 2. In Form1::ButtonClick Form2->Show(); In Form2::ButtonClick Form3->ShowModal(); I use the following to create the taskbar button in form2 void __fastcall TForm2::CreateParams(TCreateParams &Params) { TForm::CreateParams(Params); Params.ExStyle |= WS_EX_APPWINDOW; } Running the app and following the above and you should see the problem. I think that a solution might be to somehow disable Form2 from reacting to any clicks on it's taskbar button if it is disabled and instead pass the message (or whatever) on to Form1's taskbar button. An alternate solution was to remove the taskbar button of Form2 before showing Form3, I tried using this: long exstyle = GetWindowLong(hwnd, GWL_EXSTYLE); SetWindowLong(hwnd, GWL_EXSTYLE, exstyle & ~WS_EX_APPWINDOW); But unfortunately this didn't work. Anyone able to help? Best regards Chris Back to top JD Guest Posted: Wed Apr 26, 2006 7:03 am    Post subject: Re: ZOrder of Forms "Chris" <nospam (AT) nospam (DOT) com> wrote: Quote: [...] but if he clicks on Form2's taskbar button then Form2 (which is disabled because Form3 is modal) comes to the front I'm sure that there are several ways to get what you want but this worked for me: //------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { Application->OnActivate = AppActivate; } //------------------------------------------------------------- __fastcall TForm1::~TForm1() { Application->OnActivate = NULL; } //------------------------------------------------------------- void __fastcall TForm1::AppActivate(TObject *Sender) { if( Form3->Visible ) ::SetForegroundWindow( Form3->Handle ); } //------------------------------------------------------------- If you have other issues like dynamic allocation ect., you'll have to work out the details. ~ JD Back to top Chris Guest Posted: Wed Apr 26, 2006 8:03 am    Post subject: Re: ZOrder of Forms "JD" <nospam (AT) nospam (DOT) com> wrote in message news:444f0d87$1 (AT) newsgroups (DOT) borland.com... Quote: I'm sure that there are several ways to get what you want but this worked for me: //------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { Application->OnActivate = AppActivate; } //------------------------------------------------------------- __fastcall TForm1::~TForm1() { Application->OnActivate = NULL; } //------------------------------------------------------------- void __fastcall TForm1::AppActivate(TObject *Sender) { if( Form3->Visible ) ::SetForegroundWindow( Form3->Handle ); } //------------------------------------------------------------- Hi JD Thanks for the answer. I don't think this will work fo rme though as the sample I posted was just to reproduce the problem. I was really looking for a solution that was more generic (i.e. didn't have to know what other forms might be visible etc) as in my real app all the forms are created dynamically etc and I'm sure the logic to try and keep everything working smoothly would be a nightmare. I will see what others care to suggest and then see what works the best. Thanks once again Chris Back to top JD Guest Posted: Wed Apr 26, 2006 11:03 am    Post subject: Re: ZOrder of Forms "Chris" <nospam (AT) nospam (DOT) com> wrote: Quote: I don't think this will work fo rme though as the sample I posted was just to reproduce the problem. I was really looking for a solution that was more generic (i.e. didn't have to know what other forms might be visible etc) You should have included that information to begin with. #include <vector> std::vector<TForm*>vForms; //------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { Application->OnActivate = AppActivate; Application->OnDeactivate = AppDeactivate; } //------------------------------------------------------------- __fastcall TForm1::~TForm1() { Application->OnActivate = NULL; Application->OnDeactivate = NULL; } //------------------------------------------------------------- void __fastcall TForm1::AppDeactivate(TObject *Sender) { for( int x = 0; x < Screen->FormCount; ++x ) { if( Screen->Forms[x]->Visible ) vForms.push_back( Screen->Forms[x] ); } } //------------------------------------------------------------- void __fastcall TForm1::AppActivate(TObject *Sender) { for( int x = vForms.size() - 1; x > -1; --x ) { ::SetForegroundWindow( vForms[x]->Handle ); } } //------------------------------------------------------------- ~ JD Back to top JD Guest Posted: Wed Apr 26, 2006 11:03 am    Post subject: Re: ZOrder of Forms "JD" <nospam (AT) nospam (DOT) com> wrote: Quote: I should add that if you have doubts about the reliability of the sample, the Screen::Forms property maintaines the list according to their ZOrder. ~ JD Back to top Chris Guest Posted: Sat Apr 29, 2006 12:03 pm    Post subject: Re: ZOrder of Forms Hi JD Thanks for the revised version. This is better but still has problems (if just form1 and Form2 are showing, clicking on Form2's task bar button results in incorrect zorder etc) I will keep playing to see if I get anywhere, but I must confess that I have added a 'Window List' menu item to my app and I may yet remove all task bar buttons and simply let the user select the screen via the menu. Thanks for looking all the same and for the pointers. 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