73 lines
2.1 KiB
C#
73 lines
2.1 KiB
C#
using UnityEngine;
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namespace UnityEditor.Timeline
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{
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class TimeAreaAutoPanner
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{
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readonly WindowState m_State;
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readonly TimelineWindow m_Window;
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readonly Rect m_ViewRect;
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const float k_PixelDistanceToMaxSpeed = 100.0f;
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const float k_MaxPanSpeed = 30.0f;
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public TimeAreaAutoPanner(WindowState state)
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{
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m_State = state;
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m_Window = m_State.GetWindow();
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var shownRange = m_State.timeAreaShownRange;
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var trackViewBounds = m_Window.sequenceRect;
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m_ViewRect = Rect.MinMaxRect(m_State.TimeToPixel(shownRange.x), trackViewBounds.yMin,
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m_State.TimeToPixel(shownRange.y), trackViewBounds.yMax);
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}
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public void OnGUI(Event evt)
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{
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if (evt.type != EventType.Layout)
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return;
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var hFactor = 0.0f;
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var vFactor = 0.0f;
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bool horizontalPan = GetPanFactor(evt.mousePosition.x, m_ViewRect.xMin, m_ViewRect.xMax, out hFactor);
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bool verticalPan = GetPanFactor(evt.mousePosition.y, m_ViewRect.yMin, m_ViewRect.yMax, out vFactor);
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if (horizontalPan)
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{
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var translation = m_State.timeAreaTranslation;
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translation.x += hFactor * k_MaxPanSpeed;
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m_State.SetTimeAreaTransform(translation, m_State.timeAreaScale);
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}
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if (verticalPan)
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{
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var translation = m_Window.treeView.scrollPosition;
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translation.y -= vFactor * k_MaxPanSpeed;
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m_Window.treeView.scrollPosition = translation;
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}
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}
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static bool GetPanFactor(float v, float min, float max, out float factor)
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{
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factor = 0.0f;
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if (v < min)
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{
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factor = Mathf.Clamp01((min - v) / k_PixelDistanceToMaxSpeed);
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return true;
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}
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if (v > max)
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{
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factor = -Mathf.Clamp01((v - max) / k_PixelDistanceToMaxSpeed);
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return true;
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}
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return false;
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}
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}
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}
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