mirror of https://github.com/ppy/osu
76 lines
2.5 KiB
C#
76 lines
2.5 KiB
C#
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using osu.Framework.Graphics.Containers;
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using osu.Framework.Input;
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using OpenTK.Input;
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namespace osu.Game.Graphics.Containers
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{
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public class OsuScrollContainer : ScrollContainer
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{
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/// <summary>
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/// Allows controlling the scroll bar from any position in the container using the right mouse button.
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/// Uses the value of <see cref="DistanceDecayOnRightMouseScrollbar"/> to smoothly scroll to the dragged location.
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/// </summary>
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public bool RightMouseScrollbar = false;
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/// <summary>
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/// Controls the rate with which the target position is approached when performing a relative drag. Default is 0.02.
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/// </summary>
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public double DistanceDecayOnRightMouseScrollbar = 0.02;
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private bool shouldPerformRightMouseScroll(InputState state) => RightMouseScrollbar && state.Mouse.IsPressed(MouseButton.Right);
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private void scrollToRelative(float value) => ScrollTo(Clamp((value - Scrollbar.DrawSize[ScrollDim] / 2) / Scrollbar.Size[ScrollDim]), true, DistanceDecayOnRightMouseScrollbar);
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private bool mouseScrollBarDragging;
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protected override bool IsDragging => base.IsDragging || mouseScrollBarDragging;
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protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
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{
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if (shouldPerformRightMouseScroll(state))
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{
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scrollToRelative(state.Mouse.Position[ScrollDim]);
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return true;
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}
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return base.OnMouseDown(state, args);
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}
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protected override bool OnDrag(InputState state)
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{
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if (mouseScrollBarDragging)
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{
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scrollToRelative(state.Mouse.Position[ScrollDim]);
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return true;
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}
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return base.OnDrag(state);
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}
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protected override bool OnDragStart(InputState state)
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{
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if (shouldPerformRightMouseScroll(state))
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{
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mouseScrollBarDragging = true;
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return true;
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}
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return base.OnDragStart(state);
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}
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protected override bool OnDragEnd(InputState state)
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{
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if (mouseScrollBarDragging)
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{
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mouseScrollBarDragging = false;
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return true;
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}
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return base.OnDragEnd(state);
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}
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}
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}
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