d2d.sdl2.InputSource source code

1 /**
2  * Input Source
3  */
4 module d2d.sdl2.InputSource;
5 
6 import std.algorithm;
7 import std.array;
8 import std.datetime;
9 import d2d.sdl2;
10 
11 /**
12  * A pressable input source that stores it's own state
13  * State gets updated by an InputSource class that contains the pressable
14  */
15 class Pressable(T) {
16 
17     immutable T id; ///The identifier for the pressable
18     SysTime lastPressed; ///The time at which this pressable was pressed
19     SysTime lastReleased; ///The time at which this pressable was released
20 
21     /**
22      * Constructor for a pressable takes its id
23      */
24     this(T id) {
25         this.id = id;
26     }
27 
28     /**
29      * Returns whether or not this pressable is currently being held
30      */
31     @property bool isPressed() {
32         return this.lastReleased < this.lastPressed;
33     }
34 
35     /**
36      * Checks if this pressable is pressed
37      * If it is, it will mark it as released
38      * Returns whether this was actually pressed or not
39      */
40     bool testAndRelease() {
41         if (!this.isPressed) {
42             return false;
43         }
44         this.lastReleased = Clock.currTime();
45         return true;
46     }
47 
48 }
49 
50 /**
51  * A source of input from the user
52  * Handles acculmulating events and storing all the states of all the pressables
53  * The template parameter is the type for the identifier of all pressables
54  */
55 abstract class InputSource(T) : EventHandler {
56 
57     @property Pressable!T[T] allPressables(); ///Return a list of all of the pressables that can be accessed by the template type
58 
59     /**
60      * Returns a list of all of the pressables that are held down.
61      */
62     Pressable!T[] getPressedPressables() {
63         return this.allPressables.values.filter!(pressable => pressable.isPressed).array;
64     }
65 
66 }