I'm using Datatables for rendering my table, but I'd like to scroll vertically when the user scrolls horizontally. In other terms, I'd like the scrolling to be synchronized?
I've looked into the API but wasn't able to figure this one out.
You could try binding an event listener for when the table scrolls in the X direction to also scroll it in the Y direction.
Have a look at this link: Bind to on scroll event of a DataTable.
The API doesn't actually control scrolling, it just sets up the table so it overflows the parent div.
An example of the kind of code you might write:
$('.dataTables_scrollBody').on('scroll', function() {
var scrollLeftVal = $('.dataTables_scrollBody').scrollLeft();
$('.dataTables_scrollBody').scrollTop(scrollLeftVal);
});
You would likely need to fine tune some things about it but the general idea might get you going in the right direction.
Related
I have two scroll views in my app. First one contains header of a list which works horizontally and the second contains the list which works horizontally and vertically ( in both directions). So now I want to synchronize the scroll of both scroll views. I want both scroll views work simultaneously.
You would need to look into the Scroll event and the Scroll To delegate action of a ScrollView
Scrolled event documentation can be found here
ScrollToAsync documentation can be found here
Depending on exactly what you're trying to achieve you could assign the the ScrollView.Scrolled event of each ScrollView:
ScrollView.Scrolled += ()=>{
// If vertical get Scroll Y and translate it to your second ScrollViews Scroll X
SecondScrollView.ScrollToAsync(ScrollView.ScrollX, SecondScrollView.ScrollY, true)
}
SecondScrollView.Scrolled += ()=>{
// If vertical get Scroll X and translate it to your first ScrollViews Scroll Y
ScrollView.ScrollToAsync(SecondScrollView.ScrollX, ScrollView.ScrollY, true)
}
I haven't had chance to test the above, it's more of a quick example to get you going in the right direction, a few things you'd have to look out for behavior wise is when ScrollToAsync is called it will likely fire off the scroll event of that ScrollView So you'll want to handle that to ensure there isn't some weird recursive behaviour.
I need to be able to animate drag and drop in my vertical list. I used vuedraggable, wrapped my list in a transition-group and it all worked sweet. Until I fetch new data from the server. Now because of the introduction of transition-group for a split second the old data and the new data live together in the DOM causing the expansion of the list and pushing subsequent div down and back up.
This is kind of expected per the docs:
the DOM operations for insertion and/or removal will be executed
immediately on next frame (Note: this is a browser animation frame,
different from Vue’s concept of nextTick).
Regardless of being able to drag and drop the element, if we were to fade in/fade out the new/old elements they will co-habitate for the time of the animation, which is not great as seen in this pen
Anyway to fade out, change the data, then fade in the new one, while maintaining the height of the list?
Note that without fade the problem is still obvious:
Pen of my issue: click the switch data button to see the issue.
Turns out it's pretty know issue. By reading through this thread and toying with this example, i was able to achieve something to my liking by using:
list-leave-active {
display: none;
}
Resulting Pen
A css fix may be to wrap the contents within a box of some height and set overflow hidden.
So, even when new elements co-exist the jump in scrollbar can be avoided.
I am making an iOS app for remote controlling the lights in my house. I have a list of groups of bulbs (rooms) that can be turned on and off. My problem is selecting a room, I want it to be like this:
You can either press the arrows left or right to switch the room, or you can put your finger, where it says Living Room and swipe left or right to switch it.
Can someone give me a pointer as how to implement a swipe feature like that? I know there are gesture recognizers. I never used them, but I guess they won't automatically make the text I want to swipe follow my finger.
I guess it would be possible to use the gesture recognizer and manually move the text to get the swipe "feeling". It just seems to me like there should be an easier solution.
I've done something similar several times, and the most elementary way to approach it is to override the touches... methods on NSResponder. This will tell you when a user's finger touches the component, when it moves, and when they let go. From that, it's pretty easy to adjust the position of your UIView, do some custom rendering, or whatever else you need.
Another, higher-level, approach is to use a UIScrollView and implement it's delegate methods. Inside the scroll view are three elements which completely fill the viewport: the one you can see, and those to the left and right. You watch the delegate events for the user adjusting the position of the viewport and as they expose an element to the left or right, you can snap the viewport into place when they let go. Then, you adjust the three inner views to show the appropriate new content and reset the viewport to expose the middle element (which would then be showing the appropriate content).
There are undoubtedly many other approaches, but I've used both of these with good effect.
I solved it in the end by using a pangesturerecgonizer attached to the label. It's pretty straight forward, I just didn't know pan is supposed to mean something like drag and drop, I thought pan would be something completely different.
Is it possible to apply UI virtualization to ScrollViewer in WinRT. In my application I am creating a line chart with the help of Polyline(Polyline embedded inside a scrollviewver). But in the current case, If it come more than 500 points. It blocks the UI during the time of interacting with the Map. So what I am trying to achieve is to apply kind of UI virtualization to scroll view. If anyone had any idea to solve this please help me.
The way I would handle a Polyline is I would break its data into sections, perhaps screen-wide ones (assuming horizontal-only scrolling), put a Canvas inside of the ScrollViewer, make the size (Width) of the Canvas the total size of the chart and put a few (say 5) Polyline controls in it and then on the ViewChanged event update the Polyline controls' Canvas.Left and Points properties to correspond to the area around the current view port of the ScrollViewer. That should give you smooth scrolling. Just don't add/remove or update the controls on each ViewChanged and only update Canvas.Left and Points when you need to - that is when you don't have a Polyline ready to display next to the current view port.
How can I find the component in a ScrollViewer that handles the RequestBringIntoView event?
It isn't exposed on the two ScrollBar parts (not directly, anyway).
Thanks for any pointers...
UPDATE: Related: Can I get the ScrollContentPresenter part of the ScrollViewer? How?
Thanks --
Bigger picture:
We have a large Canvas contained in a ScrollViewer. At runtime, an arbitrary number of UserControls (I'll call them 'Blobs') are added to the canvas from the db. Their position and content come from the db. A user can 'select' a blob by clicking on it, and its appearance changes to indicate it is selected.
If the user uses a scrollbar to move the selected blob out of view, then clicks on another blob, the Canvas is scrolled so the previously-out-of-view blob is in view again. I assume this is due to some object raising the RequestBringIntoView, and the ScrollViewer is handling it.
Hope this makes sense...
Yet more info:
Added a handler (sb_ValueChanged) to the Scrollviewer's scrollbar ValueChanged event. Here's the stack from the mouse click that precipitates the scrolling:
OurControl.sb_ValueChanged() System.Windows.dll!System.Windows.Controls.Primitives.RangeBase.OnValueChanged() System.Windows.dll!System.Windows.Controls.Primitives.ScrollBar.OnValueChanged() System.Windows.dll!System.Windows.Controls.Primitives.RangeBase.OnValuePropertyChanged()
System.Windows.dll!System.Windows.DependencyObject.RaisePropertyChangeNotifications()
System.Windows.dll!System.Windows.DependencyObject.UpdateEffectiveValue()
System.Windows.dll!System.Windows.DependencyObject.SetValueInternal()
System.Windows.dll!System.Windows.DependencyObject.SetValue()
System.Windows.dll!System.Windows.Controls.ScrollViewer.InvalidateScrollInfo() System.Windows.dll!System.Windows.Controls.ScrollContentPresenter.VerifyScrollData()
System.Windows.dll!System.Windows.Controls.ScrollContentPresenter.ArrangeOverride()
System.Windows.dll!System.Windows.FrameworkElement.ArrangeOverride()
If only I could find out what the FrameworkElement that starts the mischief actually is...
Sorry... it doesn't seems to exist like it does in WPF. Check this link for a handy solution.
Update: Ok... for this you might need to walk the visual tree and some sort of recursive search need to be done. However, assuming you are using the default template for the scrollviewer as seen here, you can directly ask for the ScrollContentPresenter with something like this:
var BorderChild = VisualTreeHelper.GetChild(MyScrollViewer, 0);
var GridChild = VisualTreeHelper.GetChild(BorderChild, 0);
var ScrollContentPresenterChild = VisualTreeHelper.GetChild(GridChild, 0);