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Update Switch doc: disabled state (#24941)

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This commit is contained in:
Hans Muller
2018-12-10 11:21:28 -08:00
committed by GitHub
parent ab36f05474
commit e7a4e7c3b6
1 changed files with 17 additions and 5 deletions
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22
packages/flutter/lib/src/material/switch.dart
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@@ -35,6 +35,11 @@ enum _SwitchType { material, adaptive }
/// that use a switch will listen for the [onChanged] callback and rebuild the
/// switch with a new [value] to update the visual appearance of the switch.
///
/// If the [onChanged] callback is null, then the switch will be disabled (it
/// will not respond to input). A disabled switch's thumb and track are rendered
/// in shades of grey by default. The default appearance of a disabled switch
/// can be overridden with [inactiveThumbColor] and [inactiveTrackColor].
///
/// Requires one of its ancestors to be a [Material] widget.
///
/// See also:
@@ -505,8 +510,7 @@ class _RenderSwitch extends RenderToggleable {
@override
void paint(PaintingContext context, Offset offset) {
final Canvas canvas = context.canvas;
final bool isActive = onChanged != null;
final bool isEnabled = onChanged != null;
final double currentValue = position.value;
double visualPosition;
@@ -519,7 +523,17 @@ class _RenderSwitch extends RenderToggleable {
break;
}
final Color trackColor = isActive ? Color.lerp(inactiveTrackColor, activeTrackColor, currentValue) : inactiveTrackColor;
final Color trackColor = isEnabled
? Color.lerp(inactiveTrackColor, activeTrackColor, currentValue)
: inactiveTrackColor;
final Color thumbColor = isEnabled
? Color.lerp(inactiveColor, activeColor, currentValue)
: inactiveColor;
final ImageProvider thumbImage = isEnabled
? (currentValue < 0.5 ? inactiveThumbImage : activeThumbImage)
: inactiveThumbImage;
// Paint the track
final Paint paint = Paint()
@@ -544,8 +558,6 @@ class _RenderSwitch extends RenderToggleable {
try {
_isPainting = true;
BoxPainter thumbPainter;
final Color thumbColor = isActive ? Color.lerp(inactiveColor, activeColor, currentValue) : inactiveColor;
final ImageProvider thumbImage = isActive ? (currentValue < 0.5 ? inactiveThumbImage : activeThumbImage) : inactiveThumbImage;
if (_cachedThumbPainter == null || thumbColor != _cachedThumbColor || thumbImage != _cachedThumbImage) {
_cachedThumbColor = thumbColor;
_cachedThumbImage = thumbImage;