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DOOM Case Study: Wedgi

DOOM Case Study: Wedgi. Wedgi: Wordbench: Editing with a Graphical Interface see http://www.cs.duke.edu/~ola/courses/cps108/code/java/wedgi/ towards a source browser? (see sniff+ www.takefive.co.at )

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DOOM Case Study: Wedgi

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  1. DOOM Case Study: Wedgi • Wedgi: Wordbench: Editing with a Graphical Interface • see http://www.cs.duke.edu/~ola/courses/cps108/code/java/wedgi/ • towards a source browser? (see sniff+ www.takefive.co.at) • Load files/URLs (other sources) into a framework that lets you edit the source, cut/copy/paste, etc. [what’s the etc.?] • how might the user interact with the program? • What are the requirements? What are the use-cases? • Use-case • textual, narrative description of the processes in a system • how the user interacts with the system (how components of the system interact with each other)

  2. Wedgi: DOOM stage 1 • Get a working prototype up and running • work on requirements/specifications, prioritize project components, develop use-cases • choose core classes and responsibilities/relationships • write core stubs/headers, both behavior and state • get prototype up and running • Load files/URLs (both initially?) navigate among sources • Readers for sources • CardLayout for navigation • Mediator, GUI, WedgiText, other classes? • How does cut/copy/paste work?

  3. Multiple WedgiText objects • How can we cycle between several documents loaded into Wedgi? • What operations might we perform on a document? • How are documents tracked internally? • CardLayout • in theory facilitates “tabbed” layout, select among several displays • not all are actually shown (as should be in tabbed layout), in JDK 1.2 there is a tabbed layout • Objects added to container with CardLayout must be associated with a name • next, previous, first, last, and named object • What is name of first? What is name of next? Who tracks the names?

  4. Alternatives to CardLayout for Wedgi • Keep a vector/hashtable of WedgiTexts associated with a name • how is view changed when user selects another WedgiText • why doesn’t this work? myWedge = selectedWedgi; validate(); • What can we do instead to get at the idea of swapping the displayed view for another? What are the issues? • What’s the state and who’s the parent • How will save work, what about remove (for WedgiTexts) • alternatives to maps of name -> WedgiText? • What is a WedgiText? Compared to what?

  5. DataTransfer • Transferring objects and stuff between widgets in an application, between Java applications, between Java and other applications • application-specific clipboard, System clipboard • package objects and stuff up in some way that facilitates transfer • transfer in what format, out in another, e.g., HTML text • Cut and Paste • put/get a Transferable (interface) to/from clipboard setContents(Transferable,Owner), getContents(Owner) • Transferable supports at least one DataFlavor • DataFlavors are built on MIME types

  6. DataTransfer and DataFlavors For more information see Core Java Vol. II and online AWT supplemental info • MIME: Multipurpose Internet Mail Extensions • facilitate reading/writing attachments • can be used to facilitate MIME-aware Java app transfers • DataFlavors • Java and other non-Java program: transfer text • Same java program: any object • MIME-aware inter-java transfer: text-encoded/MIME data • Tranferable: returns string, stream or other source Cut and Paste DataFlavors[] flavors = trans.getTransferDataFlavors(); DataFlavor gifF = new DataFlavor(“image/gif”, “GIF bitmap”); if (trans.isDataFlavorSupported(gifF))… Object o = trans.getTransferData(someFlavorObject);

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