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Add SNAPPED PanelState #292

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Add SNAPPED PanelState #292

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30 changes: 21 additions & 9 deletions lib/src/panel.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ enum SlideDirection {
DOWN,
}

enum PanelState { OPEN, CLOSED }
enum PanelState { OPEN, CLOSED, SNAPPED }

class SlidingUpPanel extends StatefulWidget {
/// The Widget that slides into view. When the
Expand Down Expand Up @@ -153,10 +153,11 @@ class SlidingUpPanel extends StatefulWidget {
/// down on the panel.
final SlideDirection slideDirection;

/// The default state of the panel; either PanelState.OPEN or PanelState.CLOSED.
/// The default state of the panel; PanelState.OPEN, PanelState.CLOSED or PanelState.SNAPPED.
/// This value defaults to PanelState.CLOSED which indicates that the panel is
/// in the closed position and must be opened. PanelState.OPEN indicates that
/// by default the Panel is open and must be swiped closed by the user.
/// PanelState.SNAPPED indicates that by default the Pnale is opened only to the [snapPoint] position.
final PanelState defaultPanelState;

SlidingUpPanel(
Expand Down Expand Up @@ -220,13 +221,10 @@ class _SlidingUpPanelState extends State<SlidingUpPanel>
super.initState();

_ac = new AnimationController(
vsync: this,
duration: const Duration(milliseconds: 300),
value: widget.defaultPanelState == PanelState.CLOSED
? 0.0
: 1.0 //set the default panel state (i.e. set initial value of _ac)
)
..addListener(() {
vsync: this,
duration: const Duration(milliseconds: 300),
value: _getDefaultAnimationValue(),
)..addListener(() {
if (widget.onPanelSlide != null) widget.onPanelSlide!(_ac.value);

if (widget.onPanelOpened != null && _ac.value == 1.0)
Expand Down Expand Up @@ -435,6 +433,20 @@ class _SlidingUpPanelState extends State<SlidingUpPanel>
widget.parallaxOffset;
}

// set default panel state (i.e set initial value of AnimationController)
double _getDefaultAnimationValue() {
switch (widget.defaultPanelState) {
case PanelState.OPEN:
return 1.0;
case PanelState.SNAPPED:
assert(widget.snapPoint != null,
"SlidingUpPanel snapPoint property must not be null");
return widget.snapPoint!;
default:
return 0.0;
}
}

// returns a gesture detector if panel is used
// and a listener if panelBuilder is used.
// this is because the listener is designed only for use with linking the scrolling of
Expand Down