I want to place my Views dynamically on my App, so I used Absolute Layout from Xamarin.Forms.
The problem is that when I set a Y position too big it doesn't behave like I want. I want to scrool when the element is off screen but it doesn't work. Do I have to add something or it's impossible with Absolute Layout ?
Instead of an AbsoluteLayout, you need to use RelativeLayout, because:
AbsoluteLayout:
Elements cannot be positioned off screen using proportional values.
RelativeLayout:
RelativeLayout does support positioning elements outside of its own
bounds.
Related
What is alternative of DIV in NativeScript?
How to use block inline with content inside?
Within Browser the behaviour div is determined by display CSS attribute.
For example, by default it's block and vertical which is similar to StackLayout with orientation set to vertical. When you make it inline, that's more like a horizontal layout, so again could be StackLayout with orientation set to horizontal.
There is again flex, we also have an equivalent in NativeScript, the FlexboxLayout. If you set position to absolute on div, it can be compared to AbsoluteLayout in NativeScript.
There is also GridLayout, WrapLayout, and DockLayout in NativeScript that serves various purposes.
So the alternative for div here totally depends on what kind of UI / layout you are looking for / how exactly you have styled the div on web.
If you are beginner, https://www.nslayouts.com/ is a good start to know all about NativeScript layouts.
I am trying to build a scene in my 2D game which has a panel whose elements are arranged as in this image:
The ScrollRect should dynamically add rows after users provide values to the InputField, select an option from the Dropdown, and then click the Button. This all works fine, except that the viewable area of for the ScrollRect has the same vertical size as its siblings within the parent panel.
This happens because the GridLayoutGroup of the parent panel requires the child cell sizes to be specified, and if I specify a value which makes sense for the top two panels it is too short for the ScrollRect. Putting a ContentSizeFitter on the parent panel does not help (also, despite Unity warning against it, there is a ContentSizeFitter on the content of the ScrollRect since without one the newly added rows will not appear when scrolling).
So my question is:
what do I need to do to allow the vertical sizing of the children of the top level panel to be based on their sizes, when one child's vertical size will change dynamically?
Thanks!
For grid layout you cannot control the cell sizes dynamically . Instead you can use horizantal / vertical layout groups where you can find an option control child size . And as mentioned in above ans add Layout element to child component and adjust the sizes
Both #Programmer and #Salma572 answers are true. If you want that size to be a fixed number or pixels, use a LayoutElement. However, It doesn't seem you can use a scale (in percent) or anything else dynamic.
It's a shame but you'll probably need to write a script.
It is possible. Attach Layout Element component to each child GameObject. You can then dynamically change the size of each child GameObject by modifying the Layout Element's Preferred Width and Height variable.
I'm trying to do this animation in flutter :
https://material.io/guidelines/motion/choreography.html#choreography-creation
My problem is that I have absolutely no idea how to do that.
As far as I know, widgets in flutter don't know their position nor the position or other widgets at all.
And you can't access context.size inside the build method.
I tried to use Hero animation to do it. Or ScaleTransition. But it's definitely not working.
You can use showMenu to dynamically show a popup menu at a given location. Consider using PopupMenuButton, which is an IconButton that automatically shows a menu when it is tapped. There's an example in the Gallery. If showMenu doesn't do what you want, you can copy the code in popup_menu.dart and customize it to make your own version. It uses CustomSingleChildLayout and PopupRoute.
If you just want to absolutely position a Material or Card on top of other elements, you can give it some elevation and use a Positioned within a Stack. You can use an AnimatedSize to adjust the element's size with a Curve. This won't interact with the back button on Android automatically, so if you want that, you may have to use addLocalHistoryEntry or PopupRoute.
If I understand you correct - you want to show square widget, and animation is not suitable at most because widget doesn't know its size.
In this case you can try MediaQuery.of(context).size.width - it returns width of your screen, so you can use it for calculating widgets size
I want to position a button at place having certain pixels distance from left and top. I have the exact position in pixels of where to place the button. But, how can I do so?
Try Absolute layout
https://developer.xamarin.com/guides/xamarin-forms/user-interface/layouts/absolute-layout/
Another option is create view renderer which implement this funcionality in native part.
The new Unity 4.6 comes with a new GUI, when I change de resolution on Unity the UI Button scales perfectly but when I test on the Nexus 7 device the Button looks too small. Any idea how to solve this?
Unity's new GUI system uses "anchors" to control how gui elements (like buttons) scale in relation to their parent container.
Unity has a tutorial video on how to use the new "Rect Transform" component (where the anchors are configured) here: http://unity3d.com/learn/tutorials/modules/beginner/ui/rect-transform.
The last half of the tutorial is all about anchors. That page has links to the entire tutorial series. It's not too long. You should watch the whole thing.
Specific to your question:
The anchors are visible in your first screen shot. They are those 4 little arrows at the top left of your button.
Right now, your button is only anchored by it's top left corner.
The two right anchors need to be dragged to the right so that the right edge of your button is anchored to a space inside its parent container.
Depending on your situation, the two bottom arrows may need to be dragged down so that the bottom edge of your button is anchored as well.
The video I linked above covers all this in detail.
Lastly, for the font size to scale nicely on different resolutions, you will need to add and configure a reference resolution component to the base canvas of your UI, as Ash-Bash32 wrote earlier.
Update: The best way to add a Reference Resolution component is through the inspector window for the base canvas in your UI.
1) click the "Add Component Button" at the bottom of the inspector.
2) type the word "Reference" in the search filter field.
3) select the "Reference Resolution" component in the search results.
The Reference Resolution is now renamed as Canvas Scaler.. Along with the renaming they have added many more features for the dynamicity of the Canvas. You can go through the Unity Doc of Canvas Scaler and also take a look at this article for a practical example of how and why to use Canvas Scaler. Also make sure you use the Anchor Points to good effect to make this more robust...
To Scale UI added the ReferenceResolution Component to the Canvas you want to scale.
P.S. Theres no Documention for ReferenceResolution
If you want the button to be the same size for all screens and resolutions, you have to add the canvas scaler component to the canvas and the set the screen match mode to: match width or height, here is the link to the docs, this helps a lot if you want to aim to different sizes or resolutions:
http://docs.unity3d.com/Manual/HOWTO-UIMultiResolution.html
This becomes giant and convoluted once you start laying things out in code AND using a canvas scaler, so I wish to provide a thorough answer to save someone the hours I went through.
First, don't use anchoredPosition to position anything, unless you fully realize it is a 0.0 to 1.0 number. Use the RectTransform localPosition to do the actual laying out, and remember it's in relation to the parent anchor. (I had to lay out a grid from the center)
Second, put a canvas scaler on the parent layout object AND the inner ui pieces. One makes the layout in the right position, the other will resize your elements so they actually show up right. You can't rely on the the parent unless the children also have scalers (and Graphic Raycasters to touch them).
Third, if you have a scaler, DON'T use Screen.width and height, instead assume the screen is the same value you put for the scalers (hopefully you used the same, or know what you're doing). The screen width always returns the actual device pixels, retina devices too, but the canvas scalers DO NOT account for this. This probably gives unity the one remaining way to find actual screen dpi if your game wants it. Edit: This paragraph applies to any parent canvas connected to the code doing your laying out. Not stray canvases, you can probably mix it up. Just remember unity's guidelines on performance with canvases.
Fourth, the canvas is still a bit buggy. Even with the above working, some things don't render until you delete and recreate a canvas, if you re-open the scene or it crashes. Otherwise, the above is the general "rules" I've found.
To center a "grid of things" you can't just use half of the canvas scaler's width or height, you have to calculate the height of your grid and set the offset by half of it, otherwise it will always be slightly off. I just added this as an extra tip. This calculation works for all orientations.