![]() ![]() RootSpaceOfSlot(slot) - įloat distanceSq = displacement.sqrMagnitude įrom the menu bar, select Window > UI Toolkit > Drag And Drop. Private VisualElement FindClosestSlot(UQueryBuilder slots)įoreach (VisualElement slot in slotsList) Private bool OverlapsTarget(VisualElement slot) VisualElement slotsContainer = root.Q("slots") ĬlosestPos = RootSpaceOfSlot(closestOverlappingSlot) ĬlosestPos = new Vector2(closestPos.x - 5, closestPos.y - 5) Private void PointerCaptureOutHandler(PointerCaptureOutEvent evt) Sets the position of target back to its original position that overlaps target, and sets the position of target so that it rests on top of the visual tree to find all slots, decides which slot is the closest one This method checks whether a drag is in progress. Private void PointerUpHandler(PointerUpEvent evt) If both are true, makes target release the pointer. Mathf.Clamp(targetStartPosition.y + pointerDelta.y, 0, .height)) Mathf.Clamp(targetStartPosition.x + pointerDelta.x, 0, .width), Vector3 pointerDelta = evt.position - pointerStartPosition If (enabled & target.HasPointerCapture(evt.pointerId)) Private void PointerMoveHandler(PointerMoveEvent evt) If both are true, calculates a new position for target within the bounds of the window. This method checks whether a drag is in progress and whether target has captured the pointer. Private void PointerDownHandler(PointerDownEvent evt) makes target capture the pointer, and denotes that a drag is now in progress. This method stores the starting position of target and the pointer, Your finished s should look like the following. Your finished DragAndDropWindow.uxml should look like the following: You can find the image (Pouch.png) in the GitHub repository.įor instructions on how to add and style UI controls, see UI Builder. Tip: To make your project more fun, you can use a background image for the object. For object, style it as a 50px X 50px round spot with a black background color.Line up the slots as two rows with two slots in each row. For slot1 and slot2, style them as 80px X 80px squares with white background color and rounded corners.object must come after slots in the Hierarchy. One named object at the same level as slots.Each row should have two children named slot1 and slot2. One named slots with two children named slot_row1 and slot_row2.In StyleSheet, click Add Existing USS and select s.Īdd the following VisualElement UI controls: In the DragAndDrop folder, double-click DragAndDropWindow.uxml to open the UI Builder. Next, add UI controls to your custom window. Var styleSheet = AssetDatabase.LoadAssetAtPath("Assets/Drag and Drop/s") The style will be applied to the VisualElement and all of its children. A stylesheet can be added to a VisualElement. VisualElement labelFromUXML = visualTree.Instantiate() Var visualTree = AssetDatabase.LoadAssetAtPath("Assets/Drag and Drop/DragAndDropWindow.uxml") Each editor window contains a root VisualElement object Wnd.titleContent = new GUIContent("Drag And Drop") Public class DragAndDropWindow : EditorWindow Your finished DragAndDropWindow.cs should look like the following: using UnityEditor Open DragAndDropWindow.cs and change the menu name and window title to Drag And Drop, and remove the code for the default labels, to make the UI more user friendly.This automatically creates the C# script, UXML, and USS files for your custom window. In UI Toolkit Editor Window Creator, enter DragAndDropWindow.In the DragAndDrop folder, right-click and select Create > UI Toolkit > Editor Window.Create a folder in Assets called DragAndDrop to store all your files.Create a project in Unity with any template.To start, create a custom Editor window to hold your drag-and-drop UI. It defines every UI you build with the UI Toolkit. Visual Tree An object graph, made of lightweight nodes, that holds all the elements in a window or panel.Before you start, get familiar with the following: ![]() This guide is for developers familiar with the Unity Editor, UI Toolkit, and C# scripting. You can find the completed files that this example creates in this GitHub repository. You can drag the object into any slot, as shown below: A preview of a drag-and-drop UI The example adds several slots and one object in a custom Editor window. This example demonstrates how to create a drag-and-drop UI inside a custom Editor window. You can use UI Toolkit to create a drag-and-drop UI inside a custom Editor window or inside an application built by Unity. Unity currently supports three UI systems. Drag-and-drop is a common feature in UI (User Interface) Allows a user to interact with your application.
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