82 lines
3.4 KiB
C#
82 lines
3.4 KiB
C#
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Input;
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namespace Theriapolis.Game.Input;
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/// <summary>
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/// Single-frame input snapshot with helper methods.
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/// Call Update() once per frame before any input queries.
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/// </summary>
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public sealed class InputManager
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{
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private KeyboardState _prevKeys;
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private KeyboardState _currKeys;
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private MouseState _prevMouse;
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private MouseState _currMouse;
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public void Update()
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{
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_prevKeys = _currKeys;
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_currKeys = Keyboard.GetState();
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_prevMouse = _currMouse;
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_currMouse = Mouse.GetState();
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}
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// ── Keyboard ──────────────────────────────────────────────────────────────
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public bool IsDown(Keys key) => _currKeys.IsKeyDown(key);
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public bool JustPressed(Keys key) => _currKeys.IsKeyDown(key) && _prevKeys.IsKeyUp(key);
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public bool JustReleased(Keys key) => _currKeys.IsKeyUp(key) && _prevKeys.IsKeyDown(key);
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// ── Mouse ─────────────────────────────────────────────────────────────────
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public Vector2 MousePosition => new(_currMouse.X, _currMouse.Y);
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public bool LeftDown => _currMouse.LeftButton == ButtonState.Pressed;
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public bool LeftJustDown => _currMouse.LeftButton == ButtonState.Pressed && _prevMouse.LeftButton == ButtonState.Released;
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public bool LeftJustUp => _currMouse.LeftButton == ButtonState.Released && _prevMouse.LeftButton == ButtonState.Pressed;
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public bool RightDown => _currMouse.RightButton == ButtonState.Pressed;
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public bool RightJustDown => _currMouse.RightButton == ButtonState.Pressed && _prevMouse.RightButton == ButtonState.Released;
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/// <summary>Mouse wheel delta in scroll "ticks" (positive = forward/up).</summary>
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public int ScrollDelta => _currMouse.ScrollWheelValue - _prevMouse.ScrollWheelValue;
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private Vector2 _dragStart;
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private bool _dragging;
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private bool _dragActivated;
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private const float DragActivationPixels = 4f;
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public bool IsDragging => _dragging;
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/// <summary>
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/// Returns the world-space pan delta from mouse dragging. Panning is
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/// suppressed until the mouse moves more than <see cref="DragActivationPixels"/>
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/// from the press position, so hand-jitter during a click doesn't pan the
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/// camera (at low zoom, one screen pixel can be many world pixels).
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/// </summary>
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public Vector2 ConsumeDragDelta(Rendering.Camera2D camera)
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{
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if (LeftJustDown)
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{
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_dragStart = MousePosition;
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_dragging = true;
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_dragActivated = false;
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}
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if (LeftJustUp)
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{
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_dragging = false;
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_dragActivated = false;
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}
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if (!_dragging || !LeftDown) return Vector2.Zero;
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if (!_dragActivated)
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{
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if (Vector2.Distance(MousePosition, _dragStart) < DragActivationPixels)
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return Vector2.Zero;
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_dragActivated = true;
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_dragStart = MousePosition; // start panning from here, not from press
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}
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Vector2 delta = MousePosition - _dragStart;
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_dragStart = MousePosition;
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return -delta / camera.Zoom;
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}
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}
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