diff --git a/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineBlueprintContainer.cs b/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineBlueprintContainer.cs index 62c15996e0..ca23e3e88f 100644 --- a/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineBlueprintContainer.cs +++ b/osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineBlueprintContainer.cs @@ -3,6 +3,7 @@ #nullable disable +using System; using System.Collections.Generic; using System.Linq; using osu.Framework.Allocation; @@ -100,10 +101,14 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline return base.OnDragStart(e); } + private float dragTimeAccumulated; + protected override void Update() { if (IsDragged || hitObjectDragged) handleScrollViaDrag(); + else + dragTimeAccumulated = 0; if (Composer != null && timeline != null) { @@ -193,25 +198,42 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline private void handleScrollViaDrag() { + // The amount of time dragging before we reach maximum drag speed. + const float time_ramp_multiplier = 5000; + + // A maximum drag speed to ensure things don't get out of hand. + const float max_velocity = 10; + if (timeline == null) return; - var timelineQuad = timeline.ScreenSpaceDrawQuad; - float mouseX = InputManager.CurrentState.Mouse.Position.X; + var mousePos = timeline.ToLocalSpace(InputManager.CurrentState.Mouse.Position); // for better UX do not require the user to drag all the way to the edge and beyond to initiate a drag-scroll. // this is especially important in scenarios like fullscreen, where mouse confine will usually be on // and the user physically *won't be able to* drag beyond the edge of the timeline // (since its left edge is co-incident with the window edge). - const float scroll_tolerance = 20; + const float scroll_tolerance = 40; - float leftBound = timelineQuad.TopLeft.X + scroll_tolerance; - float rightBound = timelineQuad.TopRight.X - scroll_tolerance; + float leftBound = timeline.BoundingBox.TopLeft.X + scroll_tolerance; + float rightBound = timeline.BoundingBox.TopRight.X - scroll_tolerance; - // scroll if in a drag and dragging outside visible extents - if (mouseX > rightBound) - timeline.ScrollBy((float)((mouseX - rightBound) / 10 * Clock.ElapsedFrameTime)); - else if (mouseX < leftBound) - timeline.ScrollBy((float)((mouseX - leftBound) / 10 * Clock.ElapsedFrameTime)); + float amount = 0; + + if (mousePos.X > rightBound) + amount = mousePos.X - rightBound; + else if (mousePos.X < leftBound) + amount = mousePos.X - leftBound; + + if (amount == 0) + { + dragTimeAccumulated = 0; + return; + } + + amount = Math.Sign(amount) * Math.Min(max_velocity, Math.Abs(MathF.Pow(amount, 2) / (MathF.Pow(scroll_tolerance, 2)))); + dragTimeAccumulated += (float)Clock.ElapsedFrameTime; + + timeline.ScrollBy(amount * (float)Clock.ElapsedFrameTime * Math.Min(1, dragTimeAccumulated / time_ramp_multiplier)); } private partial class SelectableAreaBackground : CompositeDrawable