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114 行
2.9 KiB
114 行
2.9 KiB
using UnityEngine;
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using UnityEngine.RMGUI;
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using UnityEngine.RMGUI.StyleEnums;
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namespace RMGUI.GraphView
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{
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public class Dragger : MouseManipulator
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{
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private Vector2 m_Start;
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public Vector2 panSpeed { get; set; }
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// hold the presenter... maybe.
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public GraphElementPresenter m_presenter { get; set; }
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public bool clampToParentEdges { get; set; }
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public Dragger()
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{
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activators.Add(new ManipActivator {button = MouseButton.LeftMouse});
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panSpeed = new Vector2(1, 1);
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clampToParentEdges = false;
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}
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protected Rect CalculatePosition(float x, float y, float width, float height)
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{
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var rect = new Rect(x, y, width, height);
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if (clampToParentEdges)
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{
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if (rect.x < target.parent.position.xMin)
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rect.x = target.parent.position.xMin;
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else if (rect.xMax > target.parent.position.xMax)
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rect.x = target.parent.position.xMax - rect.width;
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if (rect.y < target.parent.position.yMin)
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rect.y = target.parent.position.yMin;
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else if (rect.yMax > target.parent.position.yMax)
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rect.y = target.parent.position.yMax - rect.height;
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// Reset size, we never intended to change them in the first place
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rect.width = width;
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rect.height = height;
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}
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return rect;
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}
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public override EventPropagation HandleEvent(Event evt, VisualElement finalTarget)
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{
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GraphElement ce = finalTarget as GraphElement;
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if (ce != null)
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{
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GraphElementPresenter presenter = ce.presenter;
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if (presenter != null && ((presenter.capabilities & Capabilities.Movable) != Capabilities.Movable))
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{
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return EventPropagation.Continue;
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}
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}
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switch (evt.type)
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{
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case EventType.MouseDown:
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if (CanStartManipulation(evt))
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{
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this.TakeCapture();
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var graphElement = target as GraphElement;
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if (graphElement != null)
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{
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m_presenter = graphElement.presenter;
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}
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m_Start = evt.mousePosition;
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return EventPropagation.Stop;
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}
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break;
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case EventType.MouseDrag:
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if (this.HasCapture() && target.positionType == PositionType.Absolute)
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{
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Vector2 diff = evt.mousePosition - m_Start;
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if (m_presenter != null)
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{
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m_presenter.position = CalculatePosition(m_presenter.position.x + diff.x,
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m_presenter.position.y + diff.y,
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m_presenter.position.width, target.position.height);
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}
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else
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{
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target.position = CalculatePosition(target.position.x + diff.x,
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target.position.y + diff.y,
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target.position.width, target.position.height);
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}
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return EventPropagation.Stop;
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}
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break;
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case EventType.MouseUp:
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if (CanStopManipulation(evt))
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{
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m_presenter = null;
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this.ReleaseCapture();
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return EventPropagation.Stop;
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}
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break;
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}
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return this.HasCapture() ? EventPropagation.Stop : EventPropagation.Continue;
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}
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}
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}
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