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An optimized approach to lists with dozens of elements and a Pooling system
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Mukarillo/UnityDynamicScrollRect
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An optimized approach to lists with dozens of elements.
you can find a pratical example inside this repository in DynamicScrollScene scene
publicclassExampleData{publicintpostId;publicintid;publicstringname;publicstringemail;publicstringbody;}
2 - Create a class that extendsDynamicScrollObject<ExampleData> and implement its abstract members (make sure to callbase.updateScrollObject(item, index);) and set the object width and height incurrentWidth andcurrentHeight.
publicclassExampleDynamicObject:DynamicScrollObject<ExampleData>{publicoverridefloatcurrentHeight{get;set;}publicoverridefloatcurrentWidth{get;set;}privateTextidText;privateTextnameEmailText;privateTextbodyText;publicvoidAwake(){currentHeight=GetComponent<RectTransform>().rect.height;currentWidth=GetComponent<RectTransform>().rect.width;idText=transform.Find("PostId").GetComponent<Text>();nameEmailText=transform.Find("NameEmail").GetComponent<Text>();bodyText=transform.Find("Body").GetComponent<Text>();}publicoverridevoidupdateScrollObject(ExampleDataitem,intindex){base.updateScrollObject(item,index);idText.text=item.id.ToString();nameEmailText.text=string.Format("{0} ({1})",item.name,item.email);bodyText.text=item.body;}}
publicclassExampleScroll:MonoBehaviour{publicDynamicScrollRectverticalScroll;publicGameObjectreferenceObject;privateDynamicScroll<ExampleData,ExampleDynamicObject>mVerticalDynamicScroll=newDynamicScroll<ExampleData,ExampleDynamicObject>();publicIEnumeratorStart(){WWWwww=newWWW(@"https://jsonplaceholder.typicode.com/comments");yieldreturnwww;vardata=JsonHelper.getJsonArray<ExampleData>(www.text);mVerticalDynamicScroll.spacing=5f;mVerticalDynamicScroll.Initiate(verticalScroll,data,0,referenceObject);}}
| name | type | description |
|---|---|---|
spacing | float | Value that represent the spacing between elements of the list |
centralizeOnStop | bool | If the list should centralize the closest element to the center of the viewport after stop moving |
objectPool | readonly Pooling < T1 > | The elements of the list |
OnDragEvent | Action < Vector2 > | Event that triggers whenever the user scrolls the list, the parameter represent the velocity of the drag |
OnBeginDragEvent | UnityEvent < PointerEventData > | Event that triggers in the first frame of dragging |
OnEndDragEvent | UnityEvent < PointerEventData > | Event that triggers in the last frame of dragging |
dynamicScroll.Initiate
Description: Initiate the scroll rect with
objReferenceobjects applyinginfoListdata.Parameters:
| name | type | description |
|---|---|---|
scrollRect | ScrollRect | a reference to the scroll rect |
infoList | T[] | the list with the data information |
startIndex | int | the item of indexstartindex will be the first element of the list |
objReference | GameObject | a reference of the object that will be inside the list |
createMoreIfNeeded | bool | if the list needs more itens, it will create more ifcreateMoreIfNeeded == true |
forceAmount | int? | if setted, it will forceforceAmount objects to be created at start |
dynamicScroll.ChangeList
Description:Change the current list of the scroll rect.
Parameters :
| name | type | description |
|---|---|---|
infoList | T[] | the list with the data information |
startIndex | int | the item of indexstartindex will be the first element of the list. If -1, the current index will be setted. |
resetContentPosition | bool | reset list position |
dynamicScroll.RefreshPosition
- Description: Repaint the whole scroll rect. This is useful if any item inside the scroll rect changes the size (
currentWidthandcurrentHeight).
dynamicScroll.ToggleScroll
Description: Enable or Disable the ability to scroll the list.
Parameters :
| name | type | description |
|---|---|---|
active | bool | enable or Disable the ability to scroll the list |
dynamicScroll.CanMove
Description: Returns true if all directions send thro parameter are available.
Parameters :
| name | type | description |
|---|---|---|
directions | ScrollDirection | Enum flag with all the directions you want to know if are available |
dynamicScroll.MoveToIndex
Description: Tweens the content to centralize the object of index specified in the parameters.
Parameters :
| name | type | description |
|---|---|---|
i | int | Index of the element to be centralized |
totalTime | float? | Total time to the animation happen (if you choose to input this value, the next one will be ignored) |
timePerElement | float? | This value will be multiplied by the difference between the current centralized element and the target element to get the totalTime |
dynamicScroll.GetCentralizedObject
- Description: Returns the closest element to the center of the viewport.
dynamicScroll.GetLowest
- Description: Returns the most left (if horizontal scroll) or most bottom (if vertical scroll) T1 object.
dynamicScroll.GetHighest
- Description: Returns the most right (if horizontal scroll) or most upper (if vertical scroll) T1 object.
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An optimized approach to lists with dozens of elements and a Pooling system
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