BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Delphi design question          BorlandTalk.com Forum Index -> comp.lang.pascal.delphi.misc View previous topic :: View next topic   Author Message Nicholas Sherlock Guest Posted: Sat Feb 19, 2005 8:15 am    Post subject: Delphi design question Hey all, I've made a few editors (for various things) over the years in Delphi, but I always run into a problem: What do you do with all of your controls for editing files if the user has not yet opened a file? It's easy to miss one when you do your big SetEnabledState(state:boolean) call. If all of your edits are applied to a single object instance, where do you store this instance? Do you check every time you want to access it to make sure that the user really does have a file open and the object has been created? When I made my first editor as an MDI application (a few months ago), it solved all of these worries. My object could be a property of the MDI window: It was created when a file was opened and the window was created, and was destroyed along with the window when the window was closed. All of the menus and controls for editing the object belonged to the MDI window, so that they were not available unless a file was actually open. So how do I carry these MDI advantages to my SDI editors? Or should I convert them to MDI? Cheers, Nicholas Sherlock Back to top Jeremy Collins Guest Posted: Sat Feb 19, 2005 8:53 am    Post subject: Re: Delphi design question Nicholas Sherlock wrote: Quote: Hey all, I've made a few editors (for various things) over the years in Delphi, but I always run into a problem: What do you do with all of your controls for editing files if the user has not yet opened a file? I use Actions for everything. As part of the OnUpdate event you have something like ThisAction.Enabled := FFileLoaded; -- jc Remove the -not from email Back to top Nicholas Sherlock Guest Posted: Sat Feb 19, 2005 9:33 pm    Post subject: Re: Delphi design question Jeremy Collins wrote: Quote: Nicholas Sherlock wrote: Hey all, I've made a few editors (for various things) over the years in Delphi, but I always run into a problem: What do you do with all of your controls for editing files if the user has not yet opened a file? I use Actions for everything. As part of the OnUpdate event you have something like ThisAction.Enabled := FFileLoaded; This works, but I have heaps of controls on my form such as treeviews, checkboxes, toolbars, spinedits, buttons, edits and and TGLScene window rendering the object being edited . I disable them in a big loop through my forms controls, but this just isn't neat. Cheers, Nicholas Sherlock Back to top Jeremy Collins Guest Posted: Sun Feb 20, 2005 10:45 am    Post subject: Re: Delphi design question Nicholas Sherlock wrote: Quote: Jeremy Collins wrote: Nicholas Sherlock wrote: Hey all, I've made a few editors (for various things) over the years in Delphi, but I always run into a problem: What do you do with all of your controls for editing files if the user has not yet opened a file? I use Actions for everything. As part of the OnUpdate event you have something like ThisAction.Enabled := FFileLoaded; This works, but I have heaps of controls on my form such as treeviews, checkboxes, toolbars, spinedits, buttons, edits and and TGLScene window rendering the object being edited . I disable them in a big loop through my forms controls, but this just isn't neat. In these situations I contain all of the controls within a parent, such as a TForm, TFrame or TPanel, and disable / hide the parent as appropriate. For an SDI application, it's simplest to have a TPanel, aligned alClient, with no borders. Put all your controls on the panel and show or hide it depending on whether a file is loaded or not. The logic for keeping the UI updated is simple; this just makes the code cleaner. -- jc Remove the -not from email Back to top Maarten Wiltink Guest Posted: Sun Feb 20, 2005 11:12 am    Post subject: Re: Delphi design question "Nicholas Sherlock" <n_sherlock (AT) hotmail (DOT) com> wrote Quote: Jeremy Collins wrote: Nicholas Sherlock wrote: I've made a few editors (for various things) over the years in Delphi, but I always run into a problem: What do you do with all of your controls for editing files if the user has not yet opened a file? I use Actions for everything. As part of the OnUpdate event you have something like ThisAction.Enabled := FFileLoaded; This works, but I have heaps of controls on my form such as treeviews, checkboxes, toolbars, spinedits, buttons, edits and and TGLScene window rendering the object being edited . I disable them in a big loop through my forms controls, but this just isn't neat. You're not thinking actions then. With actions, the controls would be enabling and disabling themselves autonomously, without the form having to know about all the interactions. As an extra bonus, actions can be more abstract than controls. Groetjes, Maarten Wiltink Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> comp.lang.pascal.delphi.misc All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.