365 lines
12 KiB
C#
365 lines
12 KiB
C#
#region License
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//
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// The Open Toolkit Library License
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//
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// Copyright (c) 2006 - 2009 the Open Toolkit library.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace OpenTK.Input
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{
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/// <summary>
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/// Encapsulates the state of a mouse device.
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/// </summary>
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public struct MouseState : IEquatable<MouseState>
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{
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#region Fields
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// Allocate enough ints to store all mouse buttons
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const int IntSize = sizeof(int);
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const int NumInts = ((int)MouseButton.LastButton + IntSize - 1) / IntSize;
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// The following line triggers bogus CS0214 in gmcs 2.0.1, sigh...
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unsafe fixed int Buttons[NumInts];
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int x, y;
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float wheel;
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bool is_connected;
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#endregion
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#region Public Members
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the specified
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/// <see cref="OpenTK.Input.MouseButton"/> is pressed.
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/// </summary>
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/// <param name="button">The <see cref="OpenTK.Input.MouseButton"/> to check.</param>
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/// <returns>True if key is pressed; false otherwise.</returns>
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public bool this[MouseButton button]
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{
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get { return IsButtonDown(button); }
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internal set
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{
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if (value)
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EnableBit((int)button);
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else
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DisableBit((int)button);
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}
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this button is down.
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/// </summary>
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/// <param name="button">The <see cref="OpenTK.Input.MouseButton"/> to check.</param>
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public bool IsButtonDown(MouseButton button)
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{
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return ReadBit((int)button);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this button is up.
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/// </summary>
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/// <param name="button">The <see cref="OpenTK.Input.MouseButton"/> to check.</param>
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public bool IsButtonUp(MouseButton button)
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{
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return !ReadBit((int)button);
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}
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/// <summary>
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/// Gets the absolute wheel position in integer units.
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/// To support high-precision mice, it is recommended to use <see cref="WheelPrecise"/> instead.
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/// </summary>
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public int Wheel
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{
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get { return (int)Math.Round(wheel, MidpointRounding.AwayFromZero); }
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}
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/// <summary>
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/// Gets the absolute wheel position in floating-point units.
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/// </summary>
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public float WheelPrecise
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{
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get { return wheel; }
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internal set
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{
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wheel = value;
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}
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}
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/// <summary>
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/// Gets an integer representing the absolute x position of the pointer, in window pixel coordinates.
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/// </summary>
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public int X
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{
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get { return x; }
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internal set { x = value; }
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}
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/// <summary>
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/// Gets an integer representing the absolute y position of the pointer, in window pixel coordinates.
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/// </summary>
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public int Y
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{
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get { return y; }
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internal set { y = value; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the left mouse button is pressed.
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/// This property is intended for XNA compatibility.
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/// </summary>
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public ButtonState LeftButton
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{
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get { return IsButtonDown(MouseButton.Left) ? ButtonState.Pressed : ButtonState.Released; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the middle mouse button is pressed.
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/// This property is intended for XNA compatibility.
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/// </summary>
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public ButtonState MiddleButton
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{
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get { return IsButtonDown(MouseButton.Middle) ? ButtonState.Pressed : ButtonState.Released; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the right mouse button is pressed.
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/// This property is intended for XNA compatibility.
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/// </summary>
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public ButtonState RightButton
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{
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get { return IsButtonDown(MouseButton.Right) ? ButtonState.Pressed : ButtonState.Released; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the first extra mouse button is pressed.
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/// This property is intended for XNA compatibility.
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/// </summary>
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public ButtonState XButton1
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{
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get { return IsButtonDown(MouseButton.Button1) ? ButtonState.Pressed : ButtonState.Released; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the second extra mouse button is pressed.
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/// This property is intended for XNA compatibility.
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/// </summary>
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public ButtonState XButton2
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{
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get { return IsButtonDown(MouseButton.Button2) ? ButtonState.Pressed : ButtonState.Released; }
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}
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/// <summary>
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/// Gets the absolute wheel position in integer units. This property is intended for XNA compatibility.
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/// To support high-precision mice, it is recommended to use <see cref="WheelPrecise"/> instead.
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/// </summary>
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public int ScrollWheelValue
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{
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get { return Wheel; }
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}
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public bool IsConnected
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{
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get { return is_connected; }
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internal set { is_connected = value; }
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}
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/// <summary>
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/// Checks whether two <see cref="MouseState" /> instances are equal.
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/// </summary>
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/// <param name="left">
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/// A <see cref="MouseState"/> instance.
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/// </param>
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/// <param name="right">
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/// A <see cref="MouseState"/> instance.
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/// </param>
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/// <returns>
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/// True if both left is equal to right; false otherwise.
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/// </returns>
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public static bool operator ==(MouseState left, MouseState right)
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{
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return left.Equals(right);
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}
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/// <summary>
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/// Checks whether two <see cref="MouseState" /> instances are not equal.
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/// </summary>
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/// <param name="left">
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/// A <see cref="MouseState"/> instance.
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/// </param>
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/// <param name="right">
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/// A <see cref="MouseState"/> instance.
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/// </param>
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/// <returns>
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/// True if both left is not equal to right; false otherwise.
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/// </returns>
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public static bool operator !=(MouseState left, MouseState right)
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{
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return !left.Equals(right);
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}
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/// <summary>
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/// Compares to an object instance for equality.
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/// </summary>
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/// <param name="obj">
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/// The <see cref="System.Object"/> to compare to.
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/// </param>
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/// <returns>
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/// True if this instance is equal to obj; false otherwise.
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/// </returns>
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public override bool Equals(object obj)
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{
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if (obj is MouseState)
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{
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return this == (MouseState)obj;
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}
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else
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{
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return false;
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}
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}
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/// <summary>
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/// Generates a hashcode for the current instance.
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/// </summary>
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/// <returns>
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/// A <see cref="System.Int32"/> represting the hashcode for this instance.
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/// </returns>
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public override int GetHashCode()
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{
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unsafe
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{
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fixed (int* b = Buttons)
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{
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return b->GetHashCode() ^ X.GetHashCode() ^ Y.GetHashCode() ^ WheelPrecise.GetHashCode();
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}
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}
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}
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#endregion
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#region Internal Members
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internal bool ReadBit(int offset)
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{
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ValidateOffset(offset);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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fixed (int* b = Buttons)
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{
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return (*(b + int_offset) & (1 << bit_offset)) != 0u;
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}
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}
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}
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internal void EnableBit(int offset)
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{
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ValidateOffset(offset);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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fixed (int* b = Buttons)
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{
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*(b + int_offset) |= 1 << bit_offset;
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}
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}
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}
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internal void DisableBit(int offset)
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{
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ValidateOffset(offset);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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fixed (int* b = Buttons)
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{
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*(b + int_offset) &= ~(1 << bit_offset);
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}
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}
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}
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internal void MergeBits(MouseState other)
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{
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unsafe
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{
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int* b2 = other.Buttons;
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fixed (int* b1 = Buttons)
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{
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for (int i = 0; i < NumInts; i++)
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*(b1 + i) |= *(b2 + i);
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}
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WheelPrecise += other.WheelPrecise;
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X += other.X;
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Y += other.Y;
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IsConnected |= other.IsConnected;
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}
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}
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#endregion
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#region Private Members
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static void ValidateOffset(int offset)
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{
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if (offset < 0 || offset >= NumInts * IntSize)
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throw new ArgumentOutOfRangeException("offset");
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}
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#endregion
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#region IEquatable<MouseState> Members
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/// <summary>
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/// Compares two MouseState instances.
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/// </summary>
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/// <param name="other">The instance to compare two.</param>
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/// <returns>True, if both instances are equal; false otherwise.</returns>
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public bool Equals(MouseState other)
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{
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bool equal = true;
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unsafe
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{
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int* b2 = other.Buttons;
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fixed (int* b1 = Buttons)
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{
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for (int i = 0; equal && i < NumInts; i++)
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equal &= *(b1 + i) == *(b2 + i);
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}
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equal &= X == other.X && Y == other.Y && WheelPrecise == other.WheelPrecise;
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}
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return equal;
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}
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#endregion
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}
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}
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