How to implement call back function in Dart

The most important details in this lesson are the use of callbacks to lift the state of a checked property up into a widget that is higher up in the widget tree and pass an action that happened lower down in the tree to the parent widget. This is done by passing a callback method called toggle check state into the task checkbox stateless widget when it gets created. This callback is waiting for the user interaction to trigger its unchanged property and pass in the latest version of the current state of the checkbox so that the check box as well as the text widget are both able to update their states based on this property. This is similar to how async and await are used to wait for the network to give us the data we need. The most important details in this lesson are the use of callbacks to lift the state of a checked property up into a widget that is higher up in the widget tree and pass an action that happened lower down in the tree to the parent widget.

This is done by passing a callback method called toggle check state into the task checkbox stateless widget when it gets created. This callback is waiting for the user interaction to trigger its unchanged property and pass in the latest version of the current state of the checkbox so that the check box as well as the text widget are both able to update their states based on this property. This is similar to how async and await are used to wait for the network to give us the data we need. The most important details in this lesson are the use of callbacks to lift the state of a checked property up into a widget that is higher up in the widget tree and pass an action that happened lower down in the tree to the parent widget. This is done by passing a callback method called toggle check state into the task checkbox stateless widget when it gets created.

This callback is waiting for the user interaction to trigger its unchanged property and pass in the latest version of the current state of the checkbox so that the check box as well as the text widget are both able to update their states based on this property. This is similar to how async and await are used to wait for the network to give us the data we need.


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