From 51b7747e62c189d430318c67368a5c84e50ece61 Mon Sep 17 00:00:00 2001
From: Arne Dußin
Date: Sun, 17 Jan 2021 13:33:04 +0100
Subject: Input revamp to make keybindings controlable.

---
 src/input/binding.rs | 123 +++++++++++++++++++++++++++++++
 src/input/button.rs  | 177 +++++++++++++++++++++++++++++++++++++++++++++
 src/input/mod.rs     | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 500 insertions(+)
 create mode 100644 src/input/binding.rs
 create mode 100644 src/input/button.rs
 create mode 100644 src/input/mod.rs

(limited to 'src/input')

diff --git a/src/input/binding.rs b/src/input/binding.rs
new file mode 100644
index 0000000..386fb66
--- /dev/null
+++ b/src/input/binding.rs
@@ -0,0 +1,123 @@
+//! Bindings module, which is a key combination that does something when pressed.
+
+use super::Button;
+use raylib::RaylibHandle;
+use serde::{Deserialize, Serialize};
+
+/// Binding struct, which holds any number of buttons (keyboard and mouse may be mixed, if desired)
+#[derive(Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct Binding {
+    buttons: Vec<Button>,
+}
+
+impl Binding {
+    /// Create a new binding from a range of buttons. The button order does not matter, but at least
+    /// one button must be supplied.
+    pub fn new(buttons: Vec<Button>) -> Self {
+        if buttons.is_empty() {
+            panic!("Tried to create a binding without any keys.");
+        }
+
+        Self { buttons }
+    }
+
+    /// Returns `true` if only mouse buttons are present in this binding, otherwise false.
+    pub fn mouse_only(&self) -> bool {
+        for button in &self.buttons {
+            match button {
+                Button::Mouse(_) => continue,
+                _ => return false,
+            }
+        }
+
+        true
+    }
+
+    /// Returns `true` if only keyboard buttons are present in this binding, otherwise false.
+    pub fn keyboard_only(&self) -> bool {
+        for button in &self.buttons {
+            match button {
+                Button::Scancode(_) | Button::Text(_) => continue,
+                _ => return false,
+            }
+        }
+
+        true
+    }
+
+    /// Returns `true` if at least one mouse button is required for this binding to work.
+    pub fn has_mouse_component(&self) -> bool {
+        self.buttons.iter().any(|b| {
+            if let Button::Mouse(_) = b {
+                true
+            } else {
+                false
+            }
+        })
+    }
+
+    /// Returns `true` if at least one keyboard button is required for this binding to work.
+    pub fn has_keyboard_component(&self) -> bool {
+        self.buttons.iter().any(|b| match b {
+            Button::Scancode(_) | Button::Text(_) => true,
+            _ => false,
+        })
+    }
+
+    /// Checks if this binding was pressed this frame. Heavily dependent on input struct working
+    /// correctly.
+    pub(super) fn is_pressed(
+        &self,
+        allow_mouse: bool,
+        allow_keyboard: bool,
+        text: &str,
+        rl: &RaylibHandle,
+    ) -> bool {
+        let mut distinct_press = false;
+        for button in &self.buttons {
+            match *button {
+                Button::Mouse(mouse_button) => {
+                    if !allow_mouse || !rl.is_mouse_button_down(mouse_button.into()) {
+                        return false;
+                    }
+
+                    /* Check if the button has been pressed in this frame exactly.
+                     * This prevents activating the same keybinding every frame
+                     * while the buttons are being held down.
+                     */
+                    if rl.is_mouse_button_pressed(mouse_button.into()) {
+                        distinct_press = true;
+                    }
+                }
+                Button::Scancode(code) => {
+                    if !allow_keyboard || !rl.is_key_down(code.into()) {
+                        return false;
+                    }
+
+                    // Check the same as with the mouse button.
+                    if rl.is_key_pressed(code.into()) {
+                        distinct_press = true;
+                    }
+                }
+                Button::Text(c) => {
+                    if !allow_keyboard || !text.contains(c) {
+                        return false;
+                    }
+
+                    // Always distinct, since on triggering, the text is cleared.
+                    distinct_press = true;
+                }
+            }
+        }
+
+        distinct_press
+    }
+}
+
+impl From<Button> for Binding {
+    fn from(button: Button) -> Self {
+        Self {
+            buttons: vec![button],
+        }
+    }
+}
diff --git a/src/input/button.rs b/src/input/button.rs
new file mode 100644
index 0000000..e9ef45e
--- /dev/null
+++ b/src/input/button.rs
@@ -0,0 +1,177 @@
+//! Reimplementation crate of the KeyboardKey and MouseButton structs of raylib, because they do
+//! not implement `serde::Serialize` and `serde::Deserialize`. If you have a better idea on how to
+//! handle it, feel free.
+
+use raylib::ffi::{KeyboardKey as rlKeyboardKey, MouseButton as rlMouseButton};
+use serde::{Deserialize, Serialize};
+use std::mem;
+
+/// Abstraction over different key-types. A binding can be constructed from this button-type or
+/// multiple button-presses can be chained together to create a binding. Just be careful to not
+/// have bindings where one binding is included in another. This includes bindings where on your
+/// keyboard you have Scancode(Shift) + Scancode(A) and another binding of Text(A) (Text(a) would
+/// be okay)
+#[derive(Serialize, Deserialize, Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum Button {
+    /// A button on the mouse (raylib supports just three :/ )
+    Mouse(MouseButton),
+    /// Scancode that is sent by the OS. This can change between OSes, but stays the same between
+    /// runs and layout changes in the keyboard.
+    Scancode(Scancode),
+    /// The text input read from the operating system. This means even characters composed or
+    /// non-ASCII characters can be used. I mean, who doesn't want to bind the wall tool to 壁?
+    Text(char),
+}
+
+#[allow(missing_docs)]
+#[repr(u32)]
+#[derive(Serialize, Deserialize, Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum MouseButton {
+    Left = 0,
+    Right = 1,
+    Middle = 2,
+}
+
+#[allow(missing_docs)]
+#[repr(u32)]
+#[derive(Serialize, Deserialize, Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum Scancode {
+    Apostrophe = 39,
+    Comma = 44,
+    Minus = 45,
+    Period = 46,
+    Slash = 47,
+    Zero = 48,
+    One = 49,
+    Two = 50,
+    Three = 51,
+    Four = 52,
+    Five = 53,
+    Six = 54,
+    Seven = 55,
+    Eight = 56,
+    Nine = 57,
+    Semicolon = 59,
+    Equal = 61,
+    A = 65,
+    B = 66,
+    C = 67,
+    D = 68,
+    E = 69,
+    F = 70,
+    G = 71,
+    H = 72,
+    I = 73,
+    J = 74,
+    K = 75,
+    L = 76,
+    M = 77,
+    N = 78,
+    O = 79,
+    P = 80,
+    Q = 81,
+    R = 82,
+    S = 83,
+    T = 84,
+    U = 85,
+    V = 86,
+    W = 87,
+    X = 88,
+    Y = 89,
+    Z = 90,
+    Space = 32,
+    Escape = 256,
+    Enter = 257,
+    Tab = 258,
+    Backspace = 259,
+    Insert = 260,
+    Delete = 261,
+    Right = 262,
+    Left = 263,
+    Down = 264,
+    Up = 265,
+    PageUp = 266,
+    PageDown = 267,
+    Home = 268,
+    End = 269,
+    CapsLock = 280,
+    ScrollLock = 281,
+    NumLock = 282,
+    PrintScreen = 283,
+    Pause = 284,
+    F1 = 290,
+    F2 = 291,
+    F3 = 292,
+    F4 = 293,
+    F5 = 294,
+    F6 = 295,
+    F7 = 296,
+    F8 = 297,
+    F9 = 298,
+    F10 = 299,
+    F11 = 300,
+    F12 = 301,
+    LeftShift = 340,
+    LeftControl = 341,
+    LeftAlt = 342,
+    LeftSuper = 343,
+    RightShift = 344,
+    RightControl = 345,
+    RightAlt = 346,
+    RightSuper = 347,
+    Menu = 348,
+    LeftBracket = 91,
+    Backslash = 92,
+    RightBracket = 93,
+    Grave = 96,
+    Keypad0 = 320,
+    Keypad1 = 321,
+    Keypad2 = 322,
+    Keypad3 = 323,
+    Keypad4 = 324,
+    Keypad5 = 325,
+    Keypad6 = 326,
+    Keypad7 = 327,
+    Keypad8 = 328,
+    Keypad9 = 329,
+    KeypadDecimal = 330,
+    KeypadDivide = 331,
+    KeypadMultiply = 332,
+    KeypadSubtract = 333,
+    KeypadAdd = 334,
+    KeypadEnter = 335,
+    KeypadEqual = 336,
+}
+
+impl From<rlMouseButton> for Button {
+    fn from(button: rlMouseButton) -> Self {
+        Self::Mouse(MouseButton::from(button))
+    }
+}
+impl From<rlKeyboardKey> for Button {
+    fn from(key: rlKeyboardKey) -> Self {
+        Self::Scancode(Scancode::from(key))
+    }
+}
+
+impl From<rlMouseButton> for MouseButton {
+    fn from(button: rlMouseButton) -> Self {
+        unsafe { mem::transmute(button as u32) }
+    }
+}
+impl Into<rlMouseButton> for MouseButton {
+    fn into(self) -> rlMouseButton {
+        unsafe { mem::transmute(self as u32) }
+    }
+}
+
+impl From<rlKeyboardKey> for Scancode {
+    fn from(key: rlKeyboardKey) -> Self {
+        unsafe { mem::transmute(key as u32) }
+    }
+}
+impl Into<rlKeyboardKey> for Scancode {
+    fn into(self) -> rlKeyboardKey {
+        unsafe { mem::transmute(self as u32) }
+    }
+}
diff --git a/src/input/mod.rs b/src/input/mod.rs
new file mode 100644
index 0000000..e8b1821
--- /dev/null
+++ b/src/input/mod.rs
@@ -0,0 +1,200 @@
+//! Input with binding abstraction
+//!
+//! Binding keys or combinations to specific actions with just raylib alone is difficult to handle in
+//! input-heavy applications, as opposed to games. This is an optimisation effort. To understand how
+//! it works, the first thing to know is that there are two main modes for bindings, which are local
+//! and global. A local binding is specific to a certain area of the window and is used to block the
+//! mouse from being sent to many different targets (think of a pop-up window over the editor, which
+//! must capture the mouse). Global bindings will be processed as long as no local binding has
+//! prevalence, but they do not have an area that needs to be managed by a handler.
+//!
+//! In summary, the local <-> global distinction is used to capture the mouse.
+//!
+//! Some elements want to capture the keyboard, for instance, when activating a text box, the text
+//! input should only go to this box, but should a tool be bound to a character, it should not
+//! activate when typing. For this purpose, any element may seize control as long as no other element
+//! still has the focus. A channel is opened and no bindings will be processed. Instead the text
+//! together with a few control characters is relayed directly to the channel, until the receiver
+//! hangs up.
+//!
+//! In summary, a channel is used to seize control of the keyboard when typing into an element.
+
+pub mod binding;
+pub mod button;
+
+pub use binding::*;
+pub use button::*;
+
+use crate::math::{ExactSurface, Rect, Vec2};
+use crate::stable_vec::StableVec;
+use raylib::ffi::KeyboardKey;
+use raylib::RaylibHandle;
+use std::collections::HashMap;
+use std::sync::mpsc::{self, Receiver, Sender};
+
+/// Input and binding handler this should only be created once per instance.
+pub struct Input {
+    global_bindings: HashMap<Binding, bool>,
+    local_bindings: StableVec<(Rect<u16>, HashMap<Binding, bool>)>,
+    last_text: String,
+    text_pipe: Option<Sender<char>>,
+    mouse_pos: Vec2<u16>,
+}
+
+impl Input {
+    /// Create a new Input and binding handler.
+    pub fn new(rl: &RaylibHandle) -> Self {
+        Self {
+            global_bindings: HashMap::new(),
+            local_bindings: StableVec::new(),
+            last_text: String::new(),
+            text_pipe: None,
+            mouse_pos: Vec2::new(rl.get_mouse_x() as u16, rl.get_mouse_y() as u16),
+        }
+    }
+
+    /// Must be called on every frame of the program, since keypresses will be processed here. This
+    /// will not activate the binding function directly, since raylib is heavily polling focused.
+    pub fn update(&mut self, rl: &mut RaylibHandle) {
+        self.mouse_pos = Vec2::new(rl.get_mouse_x() as u16, rl.get_mouse_y() as u16);
+        /* Read the next character to be sent with some extra characters
+         * raylib doesn't recognize to be valid.
+         */
+        let c = if rl.is_key_pressed(KeyboardKey::KEY_ENTER) {
+            Some('\n')
+        } else if rl.is_key_pressed(KeyboardKey::KEY_ESCAPE) {
+            Some('\x1B')
+        } else if rl.is_key_pressed(KeyboardKey::KEY_BACKSPACE) {
+            Some('\x7f')
+        } else {
+            rl.get_key_pressed_number().map(|c| c as u8 as char)
+        };
+
+        /* Send the character to the listening entity or push it to the text that
+         * is currently being read for the keybindings.
+         */
+        if let Some(text_pipe) = self.text_pipe.as_mut() {
+            if let Some(c) = c {
+                if text_pipe.send(c).is_err() {
+                    self.last_text.push(c);
+                    self.text_pipe = None;
+                }
+            }
+        } else if let Some(c) = c {
+            self.last_text.push(c);
+        }
+
+        /* Update the local parts. The local stack has priority over the global
+         * bindings, so it is processed first, with the priority going from the
+         * top of the stack to the bottom in that order (reversed vec order)
+         */
+        let mut mouse_blocked = false;
+        for (_, (rect, bindings)) in self.local_bindings.id_iter_mut().rev() {
+            if rect.contains_point(&self.mouse_pos) {
+                for (binding, state) in &mut bindings.iter_mut() {
+                    *state = binding.is_pressed(
+                        !mouse_blocked,
+                        self.text_pipe.is_none(),
+                        &self.last_text,
+                        rl,
+                    );
+
+                    if *state {
+                        self.last_text.clear();
+                    }
+                }
+
+                mouse_blocked = true;
+                break;
+            }
+        }
+
+        /* Process the global bindings, as long as nothing prevents the bindings
+         * from being processed like a local binding or the text being captured.
+         */
+        for (binding, state) in self.global_bindings.iter_mut() {
+            *state = binding.is_pressed(
+                !mouse_blocked,
+                self.text_pipe.is_none(),
+                &self.last_text,
+                rl,
+            );
+
+            if *state {
+                self.last_text.clear();
+            }
+        }
+    }
+
+    /// Add a global binding. This is necessary so the input knows which key presses to monitor.
+    pub fn add_global(&mut self, binding: Binding) -> bool {
+        self.global_bindings.insert(binding, false).is_none()
+    }
+
+    /// Add a local binding handler for the given area. Returns a unique and unchanging handler id.
+    /// Handlers with higher ids (that have been added later) are preferred over old handlers.
+    pub fn add_local_handler(&mut self, area: Rect<u16>) -> usize {
+        self.local_bindings.push((area, HashMap::new()))
+    }
+
+    /// Add a local binding for the given handler.
+    pub fn add_local(&mut self, handler_id: usize, binding: Binding) -> bool {
+        self.local_bindings
+            .get_mut(handler_id)
+            .expect("Handler does not exist")
+            .1
+            .insert(binding, false)
+            .is_none()
+    }
+
+    /// Update the binding rectangle of a handler.
+    pub fn set_binding_rect(&mut self, handler_id: usize, rect: Rect<u16>) {
+        self.local_bindings
+            .get_mut(handler_id)
+            .expect("Handler does not exist")
+            .0 = rect;
+    }
+
+    /// Check if a global binding has been activated this frame. If so, it returns true.
+    /// This will only activate once, so there is no need to worry about multiple function calls
+    /// when the user keeps the button down.
+    pub fn poll_global(&mut self, binding: &Binding) -> bool {
+        let state = self.global_bindings.get_mut(&binding);
+        if state.is_none() {
+            error!("Tried to poll binding that isn't registered.");
+            return false;
+        }
+
+        *state.unwrap()
+    }
+
+    /// Like `poll_global` bun instead checks the bindings of the local handler with the given id.
+    pub fn poll_local(&mut self, handler_id: usize, binding: &Binding) -> bool {
+        let (_, bindings) = self
+            .local_bindings
+            .get_mut(handler_id)
+            .expect("Invalid binding handler id");
+
+        let state = bindings.get_mut(&binding);
+        if state.is_none() {
+            error!("Tried to poll binding that isn't registered.");
+            return false;
+        }
+
+        *state.unwrap()
+    }
+
+    /// Attempts to capture all keyboard input from here on. If no other component is currently
+    /// capturing, it returns a receiver that can be used. When the entity no longer wants to
+    /// capture the keyboard, control must be returned by dropping the receiver.
+    pub fn try_capture_keyboard(&mut self) -> Option<Receiver<char>> {
+        if self.text_pipe.is_some() {
+            return None;
+        }
+
+        let (tx, rx) = mpsc::channel();
+        self.text_pipe = Some(tx);
+
+        Some(rx)
+    }
+}
-- 
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