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Saving and Loading the Widget

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Saving the widget

To save the state of a widget when a stack containing the widget is saved we implement the OnSave handler.

Add the OnSave handler to the widget code

  • add an element for each property
    • key: property name
    • value: property value

The rProperties array is an out parameter meaning  the value of the array is copied back to the caller when the handler completes.

public handler OnSave(out rProperties as Array)
  put mValues into rProperties["values"]
  put mLabels into rProperties["labels"]
  put mShowLabels into rProperties["showLabels"]
end handler

Loading the widget

Next we write the OnLoad handler, which loads the widget’s properties when a stack containing a widget is opened.

Add the OnLoad handler to the widget code.

The array of saved properties is passed in as a parameter, and can be used to set the values of the private instance variables to the stored property values.

public handler OnLoad(in pProperties as Array)
  put pProperties["values"] into mValues
  put pProperties["labels"] into mLabels
  put pProperties["showLabels"] into mShowLabels
end handler

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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
 

LCB Source

LCB Source
 

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