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add onAttached callback #200

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add onAttached callback #200

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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,7 @@ There are several options that allow for more control:
| `onPanelSlide` | If non-null, this callback is called as the panel slides around with the current position of the panel. The position is a double between 0.0 and 1.0 where 0.0 is fully collapsed and 1.0 is fully open. |
| `onPanelOpened` | If non-null, this callback is called when the panel is fully opened. |
| `onPanelClosed` | If non-null, this callback is called when the panel is fully collapsed. |
| `onAttached` | If non-null, this callback is called when the panel controller is attached to a SlidingUpPanel. |
| `parallaxEnabled` | If non-null and true, the SlidingUpPanel exhibits a parallax effect as the panel slides up. Essentially, the body slides up as the panel slides up. |
| `parallaxOffset` | Allows for specifying the extent of the parallax effect in terms of the percentage the panel has slid up/down. Recommended values are within 0.0 and 1.0 where 0.0 is no parallax and 1.0 mimics a one-to-one scrolling effect. Defaults to a 10% parallax. |
| `isDraggable` | Allows toggling of draggability of the SlidingUpPanel. Set this to false to prevent the user from being able to drag the panel up and down. Defaults to true. |
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8 changes: 7 additions & 1 deletion lib/src/panel.dart
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Expand Up @@ -135,6 +135,10 @@ class SlidingUpPanel extends StatefulWidget {
/// is fully collapsed.
final VoidCallback onPanelClosed;

/// If non-null, this callback is called when the panel
/// controller is attached to a SlidingUpPanel
final VoidCallback onAttached;

/// If non-null and true, the SlidingUpPanel exhibits a
/// parallax effect as the panel slides up. Essentially,
/// the body slides up as the panel slides up.
Expand Down Expand Up @@ -199,7 +203,8 @@ class SlidingUpPanel extends StatefulWidget {
this.slideDirection = SlideDirection.UP,
this.defaultPanelState = PanelState.CLOSED,
this.header,
this.footer
this.footer,
this.onAttached
}) : assert(panel != null || panelBuilder != null),
assert(0 <= backdropOpacity && backdropOpacity <= 1.0),
assert (snapPoint == null || 0 < snapPoint && snapPoint < 1.0),
Expand Down Expand Up @@ -244,6 +249,7 @@ class _SlidingUpPanelState extends State<SlidingUpPanel> with SingleTickerProvid
});

widget.controller?._addState(this);
if(widget.onAttached != null) widget.onAttached();
}

@override
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