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74 行
2.1 KiB

using System;
using UnityEngine;
using UnityEngine.Experimental.UIElements;
namespace UnityEditor.ShaderGraph.Drawing
{
public class Draggable : MouseManipulator
{
Action<Vector2> m_Handler;
bool m_Active;
bool m_OutputDeltaMovement;
public Draggable(Action<Vector2> handler, bool outputDeltaMovement = false)
{
m_Handler = handler;
m_Active = false;
m_OutputDeltaMovement = outputDeltaMovement;
activators.Add(new ManipulatorActivationFilter()
{
button = MouseButton.LeftMouse
});
}
protected override void RegisterCallbacksOnTarget()
{
target.RegisterCallback(new EventCallback<MouseDownEvent>(OnMouseDown), Capture.NoCapture);
target.RegisterCallback(new EventCallback<MouseMoveEvent>(OnMouseMove), Capture.NoCapture);
target.RegisterCallback(new EventCallback<MouseUpEvent>(OnMouseUp), Capture.NoCapture);
}
protected override void UnregisterCallbacksFromTarget()
{
target.UnregisterCallback(new EventCallback<MouseDownEvent>(OnMouseDown), Capture.NoCapture);
target.UnregisterCallback(new EventCallback<MouseMoveEvent>(OnMouseMove), Capture.NoCapture);
target.UnregisterCallback(new EventCallback<MouseUpEvent>(OnMouseUp), Capture.NoCapture);
}
void OnMouseDown(MouseDownEvent evt)
{
target.TakeMouseCapture();
m_Active = true;
evt.StopPropagation();
}
void OnMouseMove(MouseMoveEvent evt)
{
if (m_Active)
{
if (m_OutputDeltaMovement)
{
m_Handler(evt.mouseDelta);
}
else
{
m_Handler(evt.localMousePosition);
}
}
}
void OnMouseUp(MouseUpEvent evt)
{
m_Active = false;
if (target.HasMouseCapture())
{
target.ReleaseMouseCapture();
}
evt.StopPropagation();
}
}
}