96 lines
3.5 KiB
C#
96 lines
3.5 KiB
C#
using Microsoft.Xna.Framework;
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using System;
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namespace Barotrauma
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{
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public class GUIDragHandle : GUIComponent
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{
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private readonly RectTransform elementToMove;
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private Point originalOffset;
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private Vector2 dragStart;
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private bool dragStarted;
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public Rectangle DragArea;
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public Func<RectTransform, bool> ValidatePosition;
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public GUIDragHandle(RectTransform rectT, RectTransform elementToMove, string style = "GUIDragIndicator")
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: base(style, rectT)
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{
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enabled = true;
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this.elementToMove = elementToMove;
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DragArea = new Rectangle(0, 0, GameMain.GraphicsWidth, GameMain.GraphicsHeight);
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}
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protected override void Update(float deltaTime)
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{
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if (!Visible) { return; }
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base.Update(deltaTime);
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if (enabled)
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{
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if (dragStarted)
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{
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Point moveAmount = (PlayerInput.MousePosition - dragStart).ToPoint() - elementToMove.ScreenSpaceOffset;
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Rectangle rect = elementToMove.Rect;
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rect.Location += moveAmount;
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moveAmount.X += Math.Max(DragArea.X - rect.X, 0);
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moveAmount.X -= Math.Max(rect.Right - DragArea.Right, 0);
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moveAmount.Y += Math.Max(DragArea.Y - rect.Y, 0);
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moveAmount.Y -= Math.Max(rect.Bottom - DragArea.Bottom, 0);
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if (moveAmount != Point.Zero)
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{
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elementToMove.ScreenSpaceOffset += moveAmount;
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}
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bool isPositionValid = ValidatePosition == null || ValidatePosition.Invoke(elementToMove);
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if (!PlayerInput.PrimaryMouseButtonHeld())
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{
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if (!isPositionValid)
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{
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elementToMove.ScreenSpaceOffset = originalOffset;
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elementToMove.GUIComponent?.Flash();
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SoundPlayer.PlayUISound(GUISoundType.PickItemFail);
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}
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dragStarted = false;
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}
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}
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else if (Rect.Contains(PlayerInput.MousePosition) && CanBeFocused && Enabled && GUI.IsMouseOn(this) && !(GUI.MouseOn is GUIButton))
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{
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State = Selected ? ComponentState.HoverSelected : ComponentState.Hover;
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if (PlayerInput.PrimaryMouseButtonDown())
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{
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originalOffset = elementToMove.ScreenSpaceOffset;
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dragStart = PlayerInput.MousePosition - elementToMove.ScreenSpaceOffset.ToVector2();
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dragStarted = true;
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}
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}
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else
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{
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if (!ExternalHighlight)
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{
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State = Selected ? ComponentState.Selected : ComponentState.None;
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}
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else
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{
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State = ComponentState.Hover;
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}
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}
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}
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foreach (GUIComponent child in Children)
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{
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//allow buttons to handle their states themselves
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if (child is GUIButton) { continue; }
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child.State = State;
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child.Enabled = enabled;
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}
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}
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}
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}
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