•  About This Tutorial
  • What You Need to Know
  •  Notation
    • Typographic Conventions
    • Naming Conventions
•  The ViewFile Application: Building a Simple File Browser
  •  Step 1: Building the Browser Window
    • Choosing the Right Gadgets for your Application
    • Choosing the Container
    • Implementing the Main Window
    • Creating the Application
    • Previewing the Application
  •  Step 2: Browsing Files
    • Creating the File Browser
    • Creating the Gadget Items
    • Instantiating the File Viewer
    • Previewing the Application
  •  Step 3: Adding Docking Bars
    • Preparing the Main Window for Docking
    • Creating the Docking Toolbar
    • Creating the Docking Menu Bar
    • Integrating Changes into the Application
    • Previewing the Application
  •  Step 4: Adding View Frames
    • Choosing the Desktop View
    • Creating View Frames
    • Adding New Menus and Items to View Frames
    • Previewing the Application
•  Customizing Gadgets
  •  Step 1: Extending a Gadget by Changing its Graphical Appearance
    • Creating a Subclass of an Existing Gadget
    • Adding an API to the New Gadget Class
    • Modifying How the New Gadget is Drawn
    • Testing the New Gadget Class
  •  Step 2: Extending a Gadget by Changing its Behavior
    • Choosing the Right Way to Modify the Behavior of an Existing Gadget
    • Creating a Generic Interactor
    • Creating a Dedicated Interactor
    • Testing the New Interactor
  •  Step 3: Creating a Composite Gadget
    • Creating a Gadget Composed of Other Gadgets
    • Handling Keyboard Focus in a Gadget
    • Handling Events in a Gadget
    • Adding Callbacks to a Gadget
    • Testing the Composite Gadget

About This Tutorial

Step 3: Creating a Composite Gadget