68 lines
2.1 KiB
C#
68 lines
2.1 KiB
C#
using UnityEngine;
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namespace UnityEditor.Timeline
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{
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/// <summary>
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/// Scrolling mode during playback for the timeline window.
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/// </summary>
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public enum PlaybackScrollMode
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{
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/// <summary>
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/// Timeline window doesn't change while the playhead is leaving the window.
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/// </summary>
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None,
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/// <summary>
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/// Timeline window pans its content when the playhead arrive at the right of the window (like a paging scrolling).
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/// </summary>
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Pan,
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/// <summary>
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/// Timeline window move the content as the playhead moves.
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/// When the playhead reach the middle of the window, it stays there and the content scroll behind it.
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/// </summary>
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Smooth
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}
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static class PlaybackScroller
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{
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public static void AutoScroll(WindowState state)
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{
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if (Event.current.type != EventType.Layout)
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return;
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switch (state.autoScrollMode)
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{
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case PlaybackScrollMode.Pan:
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DoPanScroll(state);
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break;
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case PlaybackScrollMode.Smooth:
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DoSmoothScroll(state);
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break;
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}
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}
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static void DoSmoothScroll(WindowState state)
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{
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if (state.playing)
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state.SetPlayHeadToMiddle();
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state.UpdateLastFrameTime();
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}
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static void DoPanScroll(WindowState state)
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{
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if (!state.playing)
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return;
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var paddingDeltaTime = state.PixelDeltaToDeltaTime(WindowConstants.autoPanPaddingInPixels);
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var showRange = state.timeAreaShownRange;
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var rightBoundForPan = showRange.y - paddingDeltaTime;
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if (state.editSequence.time > rightBoundForPan)
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{
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var leftBoundForPan = showRange.x + paddingDeltaTime;
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var delta = rightBoundForPan - leftBoundForPan;
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state.SetTimeAreaShownRange(showRange.x + delta, showRange.y + delta);
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}
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}
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}
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}
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