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Widget Handlers

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Widget Handlers

There are five core handlers that any widget developer should implement:

  • OnPaint: Sent to your widget whenever LiveCode requires it to redraw. The performance of your widget is tied primarily to this handler and should be kept as efficient as possible.
  • OnCreate: Sent to your widget when it is first created by LiveCode. This can be used to initialise default data and where applicable, reduce the burden for calculating constants etc in the onPaint handler.
  • OnGeometryChanged: Sent when the control is changed in size.
  • OnSave: Sent when your widget is about to be destroyed and enables the widget to save data set on the widget.
  • OnLoad: Sent when your widget is created and enables the widget to retrieve data saved on the widget.|

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Lessons Status
1 - Hello World Library
  • Introduction
  • Installing a Text Editor
  • Creating an LCB library
  • LCB library definition
  • LCB handler definitions
  • Compiling and testing a library in LiveCode
  • LCB metadata
  • Installing an LCB Library
  • Packaging and sharing an LCB library
  • Including an LCB library in a standalone
  • Conclusion
2 - Extended Hello World Library
  • Introduction
  • Explicit Types
  • LCB Lists and Arrays
  • Type Conversion between LCB and LiveCode Script
  • Using Explicit Typing in the Library
  • Passing Parameters to the Library
  • Using Lists in the Library
  • Documenting the Library
  • Browsing the Documentation
  • Conclusion
3 - Rotated Text Widget
  • Introduction
  • Defining a Widget
  • LCB Module Level Variables
  • Widget Properties
  • Widget Handlers
  • LCB Canvas Operations
  • Compiling and Testing the Widget
  • Installing the Widget and adding it to a Stack
  • Including the Widget in a Standalone
  • Conclusion
4 - Extended Rotated Text Widget
  • Introduction
  • Integrating Properties
  • Accessing LiveCode Control Properties
  • Handling Mouse Events
  • Saving and Loading Widgets
  • Read Only Properties
  • Documenting the Widget
  • Conclusion
5 - Pie Chart Widget
  • Introduction
  • Planning the Widget
  • Widget Properties
  • The OnCreate Handler
  • The OnPaint Handler
  • Responding to Mouse Events
  • Saving and Loading the Widget
  • Installing and Including the Widget in a Standalone
  • Documenting the Widget
  • Conclusion
6 - Modifying the Line Graph Widget
  • Introduction
  • Duplicating the Line Graph Widget
  • Additional Color Properties
  • Filling the area below the line
  • Adding graph marker mouse events
  • Conclusion
7 - Additional Resources
  • Extending LiveCode Guide
  • LiveCode Builder Language Reference
  • LiveCode Builder Style Guide
  • LiveCode Documentation Format
 
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