Hw to Freeze the Button in Scroll bar - unity3d

I am using unity 2018.3.7. In my project I have instantiate 25 buttons in the scroll bar..I am scrolling the button. It is working well.
Actually i want freeze the 12 the button.When i scroll the button. The 12 th button should be constantly should be there and other button should scroll go up.
scrolling should be done but the freeze button should be constantly there.
Like Excel. If we freeze the top row. The top row is constantly there and scrolling is happened.
Like that i have to do in unity.
How to Freeze the button in scroll bar.
Edit:
Actually I have uploaded new gif file. In that gif file 2 row is freezed (Row Heading1,Row Heading2, Row Heading3,RowHeading4).
2nd row is constantly there. Rest of the the rows 4 to 100 rows are going up.
Like that i have to do ...
How can i do it..

Though your question still is very broad I guess I got now what you want. This will probably not be exactly the solution you want since your question is quite vague but it should give you a good idea and starting point for implementing it in the way you need it.
I can just assume Unity UI here is the setup I would use. Since it is quite complex I hope this image will help to understand
so what do we have here:
Canvas
has the RowController script attached. Here reference the row prefab and adjust how many rows shall be added
Panel is the only child of Canvas. I just used it as a wrapper for having a custom padding etc - it's optional
FixedRowPanel
Here we will add the fixed rows on runtime
Initially has a height of 0!
Uses anchore pivot Y = 1! This is later important for changing the height on runtime
Uses a Vertical Layout Group for automatically arranging added children
ScrollView - Your scrollview as you had it but
Uses streched layout to fill the entire Panel (except later the reduced space for the fixed rows)
Uses anchor pivot Y = 1! Again important for changing the height and position on runtime later
Viewport afaik it should already use streched anchors by default but not sure so make it
Content
Uses a Vertical Layout Group
Initially has a height of 0 (but I set this in the code anyway) and will grow and shrink accordingly when adding and removing rows
And finally RowPrefab
I didn't add its hierachy in detail but it should be clear. It has a Toggle and a Text as childs ;)
Has the Row script attached we use for storing and getting some infos
Now to the scripts - I tried to comment everything
The Row.cs is quite simple
public class Row : MonoBehaviour
{
// Reference these via the Inspector
public Toggle FixToggle;
public Text FixTogText;
public Text RowText;
public RectTransform RectTransform;
// Will be set by RowController when instantiating
public int RowIndex;
private void Awake()
{
if (!RectTransform) RectTransform = GetComponent<RectTransform>();
if (!FixToggle) FixToggle = GetComponentInChildren<Toggle>(true);
if (!FixTogText) FixTogText = FixToggle.GetComponentInChildren<Text>(true);
}
}
And here is the RowController.cs
public class RowController : MonoBehaviour
{
public Row RowPrefab;
public RectTransform ScrollView;
public RectTransform Content;
public RectTransform FixedRowParent;
public int HowManyRows = 24;
public List<Row> CurrentlyFixedRows = new List<Row>();
public List<Row> CurrentlyScrolledRows = new List<Row>();
// Start is called before the first frame update
private void Start()
{
// initially the content has height 0 since it has no children yet
Content.sizeDelta = new Vector2(Content.sizeDelta.x, 0);
for (var i = 0; i < HowManyRows; i++)
{
// Create new row instances and set their values
var row = Instantiate(RowPrefab, Content);
// store the according row index so we can later sort them on it
row.RowIndex = i;
row.RowText.text = $"Row Number {i + 1}";
// add a callback for the Toggle
row.FixToggle.onValueChanged.AddListener(s => HandleToggleChanged(row, s));
// increase the content's size to fit the children
// if you are using any offset/padding between them
// you will have to add it here as well
Content.sizeDelta += Vector2.up * row.RectTransform.rect.height;
// don't forget to add them to this list so we can easily access them
CurrentlyScrolledRows.Add(row);
}
}
// called every time a row is fixed or unfixed via the Toggle
private void HandleToggleChanged(Row row, bool newState)
{
if (newState)
{
// SET FIXED
// Update the button text
row.FixTogText.text = "Unfix";
// Move this row to the fixedRow panel
row.transform.SetParent(FixedRowParent);
// be default we assume we want the first position
var targetIndex = 0;
// if there are other fixed rows already find the first child of FixedRowParent that has a bigger value
if (CurrentlyFixedRows.Count > 0) targetIndex = CurrentlyFixedRows.FindIndex(r => r.RowIndex > row.RowIndex);
// handle case when no elements are found -> -1
// this means this row is the biggest and should be the last item
if (targetIndex < 0) targetIndex = CurrentlyFixedRows.Count;
// and finally in the hierachy move it to that position
row.transform.SetSiblingIndex(targetIndex);
// insert it to the fixed list and remove it from the scrolled list
CurrentlyFixedRows.Insert(targetIndex, row);
CurrentlyScrolledRows.Remove(row);
// Make the fixed Panel bigger about the height of one row
FixedRowParent.sizeDelta += Vector2.up * row.RectTransform.rect.height;
// Make both the scrollView and Content smaller about one row
Content.sizeDelta -= Vector2.up * row.RectTransform.rect.height;
ScrollView.sizeDelta -= Vector2.up * row.RectTransform.rect.height;
// Move the scrollView down about one row in order to make space for the fixed panel
ScrollView.anchoredPosition -= Vector2.up * row.RectTransform.rect.height;
}
else
{
// SET UNFIXED - Basically the same but the other way round
// Update the button text
row.FixTogText.text = "Set Fixed";
// Move this row back to the scrolled Content
row.transform.SetParent(Content);
// be default we assume we want the first position
var targetIndex = 0;
// if there are other scrolled rows already find the first child of Content that has a bigger value
if (CurrentlyScrolledRows.Count > 0) targetIndex = CurrentlyScrolledRows.FindIndex(r => r.RowIndex > row.RowIndex);
// handle case when no elements are found -> -1
// this means this row is the biggest and should be the last item
if (targetIndex < 0) targetIndex = CurrentlyScrolledRows.Count;
// and finally in the hierachy move it to that position
row.transform.SetSiblingIndex(targetIndex);
// insert it to the scrolled list
CurrentlyScrolledRows.Insert(targetIndex, row);
// and remove it from the fixed List
CurrentlyFixedRows.Remove(row);
// shrink the fixed Panel about ne row height
FixedRowParent.sizeDelta -= Vector2.up * row.RectTransform.rect.height;
// Increase both Content and Scrollview height by one row
Content.sizeDelta += Vector2.up * row.RectTransform.rect.height;
ScrollView.sizeDelta += Vector2.up * row.RectTransform.rect.height;
// Move scrollView up about one row height to fill the empty space
ScrollView.anchoredPosition += Vector2.up * row.RectTransform.rect.height;
}
}
}
Result:
As you can see I can now fix and unfix rows dynamically while keeping their correct order within both according panels.

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The measure item code in the Table class (used by TableViewer) will never reduce the size of rows once it has grown bigger, so there is no way to change this.
The measure code is Table.sendMeasureItem but it can't be overridden. The code here is platform specific, but I checked both the Windows and macOS version (not sure about the Linux/GTK version).
I do have a hack to work around this, but it is platform dependent and I only have it for macOS.

Unity, scalling the width of a dynamically created Gameobject in a a scroll view content box

I am trying to add 100 dynamically created buttons to a scroll view in Unity, but I have a problem letting the scroll view automatically adjust the width of the buttons to match the width of my screen.
When I tried to add the buttons manually it worked fine , but when I do this by code I get another results.
The code I am using :
public GameObject button;
public GameObject scrollviewcontents;
void Start()
{
for (int i =0; i<=100;i++) {
GameObject dbutton = Instantiate(button);
dbutton.name = i.ToString();
dbutton.transform.parent = scrollviewcontents.transform;
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}
and The results I get :
Results
Results with comments
I just want the buttons to look like as they are added manually, any help ???
By default when instantiating an object the object keeps the same world space position, rotation and scale as before. try this instead:
dbutton.transform.SetParent(scrollviewcontents.transform, false);

Growing menu with scrollbar

I hate to ask such a generic question but I'm really stuck and super hoping someone can help me along the way. Here is the situation:
I'm making the GUI for a mobile app, portrait mode. I'm using canvas scalers to scale my canvasses with a reference width of 1080. This means I effectively don't know the height of my screen space.
What I want to create is a menu with a variable amount of items. The menu must be anchored to the bottom (with an offset margin) and grow upwards. So far I've been able to manage this using VerticalLayoutGroup and anchoring the rect transform to the bottom.
But my last requirement is that if the content would grow too big, a scrollbar would appear. The definition of the content being too big is: if it would extend the (unknown) screen height ( minus the offset margin of course). I hope the following image illustrates this much clearer:
I have a unity project here: https://ufile.io/v31br
Did you give a try to scrollView? here it is: https://unity3d.com/learn/tutorials/topics/user-interface-ui/scroll-view
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I assume you use the ScrollRect component as it is the right component to use in your case.
You can check the screen height with the Screen.height property.
Once you know the screen height you can compare it with your rect height and toggle the scrollbar with the ScrollRect.vertical property. You may have to change the ScrollRect.verticalScrollbarVisibility to permanent in order to make it work for you.
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public class MenuScript : MonoBehaviour
{
public int MenuItemCount;
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public Transform MenuItemParent;
private RectTransform _rectTransform;
void Start()
{
_rectTransform = GetComponent<RectTransform>();
for (var i = 0; i <= MenuItemCount; i++)
{
GameObject instance = Instantiate(MenuItemPrefab, MenuItemParent, false);
instance.GetComponent<Text>().text = instance.name = "Item " + i;
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var deltaY = _rectTransform.sizeDelta.y + size;
if (deltaY > 0) deltaY = 0;
_rectTransform.sizeDelta = new Vector2(_rectTransform.sizeDelta.x, deltaY);
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What I'm trying to do:
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I would like to create the illusion of the entire game board beings
inside a gui like the ScrollPane where the user can scroll with a
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In reality the ScrollPane will be linked to a single canvas exactly
the size of the viewport.
I'm not sure what the right way to go about this is. The scroll pane does not seem to have a property that allows you to pretend it has a large object in it. I could place a large canvas in the scroll pane but large canvases take up memory, as my crashes have suggested. Should I be using an AnchorPane or something? What's the proper way to do this?
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private Pane gridView;
/** Exists in {#link #gridView} and is exactly the size of the viewport of
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private Canvas can;
/** A label the specifies what hex is currently moused-over */
private Label currentHexLabel;
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// sets the canvas to the right size if needed
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gc = can.getGraphicsContext2D();
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if (gridView == null) {
gridView = new AnchorPane();
gridScroll.setContent(gridView);
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Bounds oldDim = gridView.getBoundsInLocal();
if (!(oldDim.getWidth() == dim[0]
&& oldDim.getHeight() == dim[1])) {
gridView.setPrefSize(dim[0], dim[1]);
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// puts the canvas in the right position
if (!gridView.getChildren().contains(can))
gridView.getChildren().add(can);
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double[] y = getYScreenRange();
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}

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What I use to add the views in Perspective is the following:
public void createInitialLayout(IPageLayout layout) {
String editorArea = layout.getEditorArea();
layout.addStandaloneViewPlaceholder(MarkerView.VIEW_ID + ":0", IPageLayout.TOP, 0.6F, editorArea, true);
layout.addStandaloneViewPlaceholder(MarkerView.VIEW_ID + ":1", IPageLayout.BOTTOM, 0.6F, editorArea, true);
layout.addStandaloneViewPlaceholder(MarkerView.VIEW_ID + ":2", IPageLayout.BOTTOM, 0.6F, editorArea, true);
The problem is that not knowing what the number of views will be, the ratios won't provide equal space to all instances of the view.
Is it somehow possible to adjust the ratios of existing views after adding a new one?
I've also tried having the view class implement ISizeProvider (which I admit I do not have a full grasp of), but haven't managed to achieve what I want with that either:
#Override
public int getSizeFlags(boolean width) {
return width ? 0 : SWT.FILL | SWT.MIN | SWT.MAX;
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#Override
public int computePreferredSize(boolean width, int availableParallel, int availablePerpendicular, int preferredResult) {
int windowHeight = PlatformUI.getWorkbench().getDisplay().getActiveShell().getBounds().height;
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Is this approach something in the right direction at least?