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#region License
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/* FNA - XNA4 Reimplementation for Desktop Platforms
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* Copyright 2009-2020 Ethan Lee and the MonoGame Team
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*
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* Released under the Microsoft Public License.
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* See LICENSE for details.
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*/
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#endregion
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#region Using Statements
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using System;
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using System.Collections.Generic;
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#endregion
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namespace Microsoft.Xna.Framework.Input.Touch
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{
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// https://msdn.microsoft.com/en-us/library/microsoft.xna.framework.input.touch.touchpanel.aspx
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public static class TouchPanel
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{
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#region Internal Constants
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// The maximum number of simultaneous touches allowed by XNA.
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internal const int MAX_TOUCHES = 8;
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// The value that represents the absence of a finger.
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internal const int NO_FINGER = -1;
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#endregion
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#region Public Static Properties
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public static int DisplayWidth
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{
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get;
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set;
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}
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public static int DisplayHeight
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{
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get;
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set;
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}
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public static DisplayOrientation DisplayOrientation
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{
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get;
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set;
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}
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public static GestureType EnabledGestures
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{
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get;
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set;
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}
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public static bool IsGestureAvailable
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{
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get
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{
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return gestures.Count > 0;
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}
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}
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public static IntPtr WindowHandle
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{
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get;
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set;
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}
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#endregion
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#region Internal Static Variables
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internal static bool TouchDeviceExists;
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#endregion
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#region Private Static Variables
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private static Queue<GestureSample> gestures = new Queue<GestureSample>();
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private static TouchLocation[] touches = new TouchLocation[MAX_TOUCHES];
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private static TouchLocation[] prevTouches = new TouchLocation[MAX_TOUCHES];
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private static List<TouchLocation> validTouches = new List<TouchLocation>();
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#endregion
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#region Public Static Methods
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public static TouchPanelCapabilities GetCapabilities()
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{
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return FNAPlatform.GetTouchCapabilities();
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}
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public static TouchCollection GetState()
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{
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validTouches.Clear();
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for (int i = 0; i < MAX_TOUCHES; i += 1)
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{
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if (touches[i].State != TouchLocationState.Invalid)
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{
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validTouches.Add(touches[i]);
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}
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}
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return new TouchCollection(validTouches.ToArray());
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}
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public static GestureSample ReadGesture()
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{
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if (gestures.Count == 0)
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{
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throw new InvalidOperationException();
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}
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return gestures.Dequeue();
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}
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#endregion
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#region Internal Static Methods
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internal static void EnqueueGesture(GestureSample gesture)
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{
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gestures.Enqueue(gesture);
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}
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internal static void INTERNAL_onTouchEvent(
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int fingerId,
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TouchLocationState state,
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float x,
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float y,
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float dx,
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float dy
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)
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{
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// Calculate the scaled touch position
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Vector2 touchPos = new Vector2(
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(float) Math.Round(x * DisplayWidth),
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(float) Math.Round(y * DisplayHeight)
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);
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// Notify the Gesture Detector about the event
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switch (state)
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{
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case TouchLocationState.Pressed:
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GestureDetector.OnPressed(fingerId, touchPos);
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break;
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case TouchLocationState.Moved:
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Vector2 delta = new Vector2(
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(float) Math.Round(dx * DisplayWidth),
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(float) Math.Round(dy * DisplayHeight)
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);
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GestureDetector.OnMoved(fingerId, touchPos, delta);
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break;
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case TouchLocationState.Released:
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GestureDetector.OnReleased(fingerId, touchPos);
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break;
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}
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}
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internal static void SetFinger(int index, int fingerId, Vector2 fingerPos)
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{
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if (fingerId == NO_FINGER)
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{
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// Was there a finger here before and the user just released it?
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if (prevTouches[index].State != TouchLocationState.Invalid
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&& prevTouches[index].State != TouchLocationState.Released)
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{
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touches[index] = new TouchLocation(
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prevTouches[index].Id,
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TouchLocationState.Released,
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prevTouches[index].Position,
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prevTouches[index].State,
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prevTouches[index].Position
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);
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}
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else
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{
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/* Nothing interesting here at all.
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* Insert invalid data so this element
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* is not included in GetState().
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*/
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touches[index] = new TouchLocation(
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NO_FINGER,
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TouchLocationState.Invalid,
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Vector2.Zero
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);
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}
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return;
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}
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// Is this a newly pressed finger?
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if (prevTouches[index].State == TouchLocationState.Invalid)
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{
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touches[index] = new TouchLocation(
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fingerId,
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TouchLocationState.Pressed,
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fingerPos
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);
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}
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else
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{
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// This finger was already down, so it's "moved"
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touches[index] = new TouchLocation(
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fingerId,
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TouchLocationState.Moved,
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fingerPos,
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prevTouches[index].State,
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prevTouches[index].Position
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);
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}
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}
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internal static void Update()
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{
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// Update Gesture Detector for time-sensitive gestures
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GestureDetector.OnUpdate();
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// Remember the last frame's touches
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touches.CopyTo(prevTouches, 0);
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// Get the latest finger data
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FNAPlatform.UpdateTouchPanelState();
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}
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#endregion
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}
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}
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