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87 lines
3.3 KiB
87 lines
3.3 KiB
using UnityEditor;
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using UnityEngine;
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using static UnityEditor.EditorGUI;
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namespace LeTai.TrueShadow.Editor
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{
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[CustomPropertyDrawer(typeof(SpreadSliderAttribute))]
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public class SpreadSliderDrawer : PropertyDrawer
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{
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const float SLIDER_SPACING = 5;
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const float MARKER_HEIGHT = 6;
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const float MARKER_ALPHA = .75f;
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const float MARKER_FILLET = 2;
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static readonly Vector4 START_RADII = new Vector4(MARKER_FILLET, 0, 0, MARKER_FILLET);
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static readonly Vector4 END_RADII = new Vector4(0, MARKER_FILLET, MARKER_FILLET, 0);
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public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
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{
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using (var propScope = new PropertyScope(position, label, property))
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using (var changeScope = new ChangeCheckScope())
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{
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var controlPosition = PrefixLabel(position, propScope.content);
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var floatFieldWidth = Mathf.Min(EditorGUIUtility.fieldWidth, controlPosition.width);
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var sliderPosition = new Rect(controlPosition)
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{width = controlPosition.width - floatFieldWidth - SLIDER_SPACING};
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const float marker1 = .8f;
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const float marker2 = .95f;
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DrawMarkers(sliderPosition,
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(marker1, new Color(1.00000f, 0.60392f, 0.01961f, MARKER_ALPHA)),
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(marker2, new Color(1.00000f, 0.25490f, 0.20784f, MARKER_ALPHA)));
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var newVal = Slider(controlPosition,
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GUIContent.none,
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property.floatValue,
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0, 1);
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if (!Event.current.control && !Event.current.alt)
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{
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var dist1 = (newVal - marker1) * sliderPosition.width;
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var dist2 = (newVal - marker2) * sliderPosition.width;
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if (0 < dist1 && dist1 < 4)
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newVal = marker1;
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if (0 < dist2 && dist2 < 4)
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newVal = marker2;
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}
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if (changeScope.changed)
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property.floatValue = newVal;
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}
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}
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void DrawMarkers(Rect sliderPosition, params (float, Color)[] markers)
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{
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var hPad = GUI.skin.horizontalSliderThumb.fixedWidth / 2f;
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var markerXStart = sliderPosition.x + hPad;
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var markerXEnd = sliderPosition.width - hPad * 2;
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var vPad = (sliderPosition.height - MARKER_HEIGHT) / 2f;
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var markerYStart = sliderPosition.y + vPad;
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var markerHeight = sliderPosition.height - vPad * 2;
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for (var i = 0; i < markers.Length; i++)
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{
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var (offset, color) = markers[i];
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var x = markerXStart + markerXEnd * offset;
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var width = i < markers.Length - 1
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? sliderPosition.width * (markers[i + 1].Item1 - offset) - 1
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: sliderPosition.xMax - x;
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var position = new Rect {
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x = x,
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y = markerYStart,
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width = width,
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height = markerHeight
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};
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var radii = i == 0 ? START_RADII : END_RADII;
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GUI.DrawTexture(position,
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Texture2D.whiteTexture, ScaleMode.StretchToFill, true, 0, color,
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Vector4.zero, radii);
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}
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}
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}
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}
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