Difference between revisions of "RTTI controls"

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(Deleted category because this page is single which wants that not-existing category.)
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* [[Runtime Type Information (RTTI)]]
* [[Runtime Type Information (RTTI)]]
* [[RTTI tab]]
* [[RTTI tab]]
* [https://www.freepascal.org/~michael/articles/#rtti explanation on RTTI controls in Lazarus]

Latest revision as of 09:32, 10 June 2020

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This page describes the package RunTimeTypeInfoControls in <lazarusdir>/components/rtticontrols/.

RTTI controls extend many LCL controls by the ability to directly connect to published properties of classes. They greatly reduce writing boring code, by automatically loading/saving data between LCL controls and published properties. In fact, you can create fully functional forms without writing any code at all.

In combination with Streaming components you can reduce the amount of code needed for connecting the program Data with the GUI and the Disk/Network to a minimum.

Testing Components

The RTTI controls are very useful when writing/testing a component.

  • Drop the component onto a form
  • Drop an RTTI control onto the form
  • Set the RTTI component's Link.TIObject property to your component
  • Set the RTTI component's Link.TIPropertyName (from the drop-down list) to the property
  • You can now edit the property interactively and see the effects of your changes at runtime (and sometimes designtime; depending on the component)
  • Each RTTI control will try to invoke the appropriate property editor for your chosen property.

So for instance, if the property is a StringList type, the RTTIButton would bring up the StringList editor, the RTTIMemo would display it - all without writing a line of code!

See Also