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Merge pull request #1183 from Hixie/dismissable

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Be more explicit about what's state in dismissable
This commit is contained in:
Ian Hickson 2015-09-16 09:06:09 -07:00
commit 63d3b6db95
1 changed files with 33 additions and 23 deletions
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56
packages/flutter/lib/src/widgets/dismissable.dart
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@ -75,14 +75,6 @@ class Dismissable extends StatefulComponent {
_startResizePerformance();
}
Point get _activeCardDragEndPoint {
if (!_isActive)
return Point.origin;
assert(_size != null);
double extent = _directionIsYAxis ? _size.height : _size.width;
return new Point(_dragExtent.sign * extent * _kDismissCardThreshold, 0.0);
}
bool get _isActive {
return _size != null && (_dragUnderway || _fadePerformance.isAnimating);
}
@ -120,9 +112,11 @@ class Dismissable extends StatefulComponent {
void _handleDragStart() {
if (_fadePerformance.isAnimating)
return;
_dragUnderway = true;
_dragExtent = 0.0;
_fadePerformance.progress = 0.0;
setState(() {
_dragUnderway = true;
_dragExtent = 0.0;
_fadePerformance.progress = 0.0;
});
}
void _handleDragUpdate(double scrollOffset) {
@ -149,8 +143,14 @@ class Dismissable extends StatefulComponent {
break;
}
if (oldDragExtent.sign != _dragExtent.sign)
setState(() {}); // Rebuild to update the new drag endpoint.
if (oldDragExtent.sign != _dragExtent.sign) {
setState(() {
// Rebuild to update the new drag endpoint.
// The sign of _dragExtent is part of our build state;
// the actual value is not, it's just used to configure
// the performances.
});
}
if (!_fadePerformance.isAnimating)
_fadePerformance.progress = _dragExtent.abs() / (_size.width * _kDismissCardThreshold);
}
@ -188,16 +188,18 @@ class Dismissable extends StatefulComponent {
if (!_isActive || _fadePerformance.isAnimating)
return;
_dragUnderway = false;
if (_fadePerformance.isCompleted) {
_startResizePerformance();
} else if (_isFlingGesture(velocity)) {
double flingVelocity = _directionIsYAxis ? velocity.dy : velocity.dx;
_dragExtent = flingVelocity.sign;
_fadePerformance.fling(velocity: flingVelocity.abs() * _kFlingVelocityScale);
} else {
_fadePerformance.reverse();
}
setState(() {
_dragUnderway = false;
if (_fadePerformance.isCompleted) {
_startResizePerformance();
} else if (_isFlingGesture(velocity)) {
double flingVelocity = _directionIsYAxis ? velocity.dy : velocity.dx;
_dragExtent = flingVelocity.sign;
_fadePerformance.fling(velocity: flingVelocity.abs() * _kFlingVelocityScale);
} else {
_fadePerformance.reverse();
}
});
}
void _handleSizeChanged(Size newSize) {
@ -206,6 +208,14 @@ class Dismissable extends StatefulComponent {
});
}
Point get _activeCardDragEndPoint {
if (!_isActive)
return Point.origin;
assert(_size != null);
double extent = _directionIsYAxis ? _size.height : _size.width;
return new Point(_dragExtent.sign * extent * _kDismissCardThreshold, 0.0);
}
Widget build() {
if (_resizePerformance != null) {
AnimatedValue<double> squashAxisExtent = new AnimatedValue<double>(