LoadingSpinner.cs
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using UnityEngine;
using UnityEditor;
using UnityEngine.UIElements;
namespace Unity.PlasticSCM.Editor.UI.UIElements
{
internal class LoadingSpinner : VisualElement
{
internal LoadingSpinner()
{
mStarted = false;
// add child elements to set up centered spinner rotation
mSpinner = new VisualElement();
Add(mSpinner);
mSpinner.style.backgroundImage = Images.GetImage(Images.Name.Loading);
mSpinner.style.position = Position.Absolute;
mSpinner.style.width = 16;
mSpinner.style.height = 16;
mSpinner.style.left = -8;
mSpinner.style.top = -8;
style.position = Position.Relative;
style.width = 16;
style.height = 16;
style.left = 8;
style.top = 8;
}
internal void Dispose()
{
if (mStarted)
EditorApplication.update -= UpdateProgress;
}
internal void Start()
{
if (mStarted)
return;
mRotation = 0;
mLastRotationTime = EditorApplication.timeSinceStartup;
EditorApplication.update += UpdateProgress;
mStarted = true;
}
internal void Stop()
{
if (!mStarted)
return;
EditorApplication.update -= UpdateProgress;
mStarted = false;
}
void UpdateProgress()
{
double currentTime = EditorApplication.timeSinceStartup;
double deltaTime = currentTime - mLastRotationTime;
#if UNITY_2021_2_OR_NEWER
mSpinner.transform.rotation = Quaternion.Euler(0, 0, mRotation);
#else
transform.rotation = Quaternion.Euler(0, 0, mRotation);
#endif
mRotation += (int)(ROTATION_SPEED * deltaTime);
mRotation = mRotation % 360;
if (mRotation < 0) mRotation += 360;
mLastRotationTime = currentTime;
}
int mRotation;
double mLastRotationTime;
bool mStarted;
VisualElement mSpinner;
const int ROTATION_SPEED = 360; // Euler degrees per second
}
}