As far as I know, due to this question Flutter AbsorbPointer vs IgnorePointer difference , AbsorbPointer will absorb tap event and other widgets below it will not receive tap event, but when I use AbsorbPointer like this. it still pass tap event to its parent:
GestureDetector(
onTap: () {
print('123'); // This still call when I tap on red container
},
child: Container(
color: Colors.green,
width: 300,
height: 300,
child: Center(
child: AbsorbPointer(
absorbing: true,
child: GestureDetector(
onTap: () {
print('567');
},
child: Container(
color: Colors.red,
width: 100,
height: 100,
),
),
),
),
),
)
So my question is does AbsorbPointer only work with widget same level in Stack and doesn't work with its parent?
In your code absorbing property having true value. which means your red container is not clickable. so parent green container have tapped. Incase if you change absorbing property to false, red container can able to tap.
Related
I want to detect when a drag on a widget starts, but also want other child GestureDetectors to respond to the drag.
My GestureDetector looks like below. Is there a way for widgetWithGestureDetector() to also receive the gesture? (I.e., for the gesture to fall through to its children?)
GestureDetector(
onHorizontalDragStart: (_) => doSomething(),
child: WidgetWithGestureDetector(),
:
I thing you are missing state.
bool dragStarted = false;
GestureDetector(
onHorizontalDragStart: (DragStartDetails drag) {
setState(() {
dragStarted = true
});
},
child: Container(
color: Colors.yellow.shade600,
padding: const EdgeInsets.all(8),
// Change button text when light changes state.
child: Text(dragStarted ? 'Its Started' : 'Its not Started'),
),
),
Then whenever you need to check for dragStarted state you access this. Even for widget outside GestureDetector.
Container(
color: Colors.yellow.shade600,
padding: const EdgeInsets.all(8),
// Change button text when light changes state.
child: Text(dragStarted ? 'Its Started' : 'Its not Started'),
),
You can use onHorizontalDragEnd for set it back to false
Gesture Detector isn't working - why not?
print or Navigator not working
GestureDetector(
onTap: () {
... ;
},
child: Container(
color: Colors.white,
width: 170,
height: 60,
child:...
),
),
Often times, this is because your GestureDetector is a child of another Widget that has an onTap property. For example, if you give an ElevatedButton a child of GestureDetector, this GestureDetector's onTap is never reached, due to the ElevatedButton overruling its onTap property.
I have a stack containing a GestureDetector (which is the up-most layer and spans across the whole screen) and another widget (under it) that eventually has a ListView. The problem is that the global GestureDetector uses onHorizontalDrag which consumes the touch event. Instead, I want the ListView to consume that event only.
In short, is there a way to make the ListView take precedence over the GestureDetector without keeping some sort of a state? Note, the ListView is not a child/sub-child of the GestureDetector - they are on different branches within the widget tree.
I try out a stack with two GestureDetectors. It gives the highest preference to the GestureDetector which is placed last in the stack.
Example:
#override
Widget build(BuildContext context) {
return Stack(
children: [
GestureDetector(
onTap: () => {
print("gesture detector1 event fired"),
},
child: Container(
color: Colors.red,
height: 600,
width: 400,
),
),
GestureDetector(
onTap: () => {
print("gesture detector2 event fired"),
},
child: Container(
color: Colors.blue,
height: 200,
width: 400,
),
),
],
);
}
When you click on the blue color container "Gesture Detector 2 is fired", you click on the red color container then "Gesture Detector 1 is fired"
Refer this image
try adding behavior: HitTestBehavoir.translucent or HitTestBehavoir.deferToChild to the gestureture detector.
I have a button with a icon inside of it. Right now I am using two different icons and change them onTap:
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
setState(() {
_isDropdownOpened = !_isDropdownOpened;
}
...
},
child:
_isDropdownOpened
? SvgPicture.asset(
'images/icons/arrow_down_primary.svg',
width: scaleWidth(12),
)
: SvgPicture.asset(
'images/icons/arrow_up_primary.svg',
width: scaleWidth(12),
),
),
);
This is working but I would like to have a RotationTransition. How can I rotate my icon onTap with animation, so I don't need two different SVGs?
use RotatedBox widget and change its rotation in your setState
you can do like this
child: RotatedBox(
quarterTurns: _isDropdownOpened? 2:0,
child: SvgPicture.asset(
'images/icons/arrow_down_primary.svg',
width: scaleWidth(12),
),
)
if you want to apply animation to the rotation as well consider looking to this
I got an issue with RaisedButton when using it inside a Positioned widget.
The problem is when I used RaisedButton inside Positioned widget, onPressed event didn't trigger when clicking on RaisedButton child, but when I clicked on another space of RaisedButton It worked.
Note that It works fine in normal situations and It happened when using RaisedButton inside Positioned widget.
here is my widget :
Positioned(
child: Center(
child: SizedBox(
width: 80,
height: 65,
child: RaisedButton(
padding: EdgeInsets.all(0),
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
color: Colors.green,
child: Icon(Icons.message, size: 50, color: Colors.white,),
// When I clicked on this icon, onPressed didn't triggered. but when I click on another space of button it triggered.
onPressed: () {
print('Hello world from onPressed');
},
),
),
),
top: -30,
left: 0,
right: 0,
)
what's your idea to fix this problem ?
The short answer is:
Flutter doesn't trigger push events for items that overlap the bounds of the stack (this is what you do when you set top to -30).
The reason behind this could be found here: Document that widgets in the overflow of stack do not respond to gestures
A possible solution for you is to move all the other items for 30.0 lower, so you can place the button inside the stack.
A solution to this problem is by wrapping the stack in a gesture detector and add what do you want to add in onpressed of the raised button in the ontap property of the gesture detector