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extern crate sdl2;
extern crate imgui;
use sdl2::sys as sdl2_sys;
use imgui::sys as imgui_sys;
use sdl2::video::Window;
use sdl2::EventPump;
use imgui::ImGui;
use std::time::Instant;
use std::os::raw::{c_char, c_void};
use sdl2::event::Event;
pub struct ImguiSdl2 {
last_frame: Instant,
mouse_press: [bool; 5],
}
impl ImguiSdl2 {
pub fn new(
imgui: &mut ImGui,
) -> Self {
{
let io = unsafe { &mut *imgui_sys::igGetIO() };
io.get_clipboard_text_fn = Some(get_clipboard_text);
io.set_clipboard_text_fn = Some(set_clipboard_text);
io.clipboard_user_data = std::ptr::null_mut();
}
{
use sdl2::keyboard::Scancode;
use imgui::ImGuiKey;
imgui.set_imgui_key(ImGuiKey::Tab, Scancode::Tab as u8);
imgui.set_imgui_key(ImGuiKey::LeftArrow, Scancode::Left as u8);
imgui.set_imgui_key(ImGuiKey::RightArrow, Scancode::Right as u8);
imgui.set_imgui_key(ImGuiKey::UpArrow, Scancode::Up as u8);
imgui.set_imgui_key(ImGuiKey::DownArrow, Scancode::Down as u8);
imgui.set_imgui_key(ImGuiKey::PageUp, Scancode::PageUp as u8);
imgui.set_imgui_key(ImGuiKey::PageDown, Scancode::PageDown as u8);
imgui.set_imgui_key(ImGuiKey::Home, Scancode::Home as u8);
imgui.set_imgui_key(ImGuiKey::End, Scancode::End as u8);
imgui.set_imgui_key(ImGuiKey::Delete, Scancode::Delete as u8);
imgui.set_imgui_key(ImGuiKey::Backspace, Scancode::Backspace as u8);
imgui.set_imgui_key(ImGuiKey::Enter, Scancode::Return as u8);
imgui.set_imgui_key(ImGuiKey::Escape, Scancode::Escape as u8);
imgui.set_imgui_key(ImGuiKey::A, Scancode::A as u8);
imgui.set_imgui_key(ImGuiKey::C, Scancode::C as u8);
imgui.set_imgui_key(ImGuiKey::V, Scancode::V as u8);
imgui.set_imgui_key(ImGuiKey::X, Scancode::X as u8);
imgui.set_imgui_key(ImGuiKey::Y, Scancode::Y as u8);
imgui.set_imgui_key(ImGuiKey::Z, Scancode::Z as u8);
}
Self {
last_frame: Instant::now(),
mouse_press: [false; 5],
}
}
pub fn handle_event(&mut self, imgui: &mut ImGui, event: &Event) {
use sdl2::mouse::MouseButton;
use sdl2::keyboard;
fn set_mod(imgui: &mut ImGui, keymod: keyboard::Mod) {
let ctrl = keymod.intersects(keyboard::RCTRLMOD | keyboard::LCTRLMOD);
let alt = keymod.intersects(keyboard::RALTMOD | keyboard::LALTMOD);
let shift = keymod.intersects(keyboard::RSHIFTMOD | keyboard::LSHIFTMOD);
let super_ = keymod.intersects(keyboard::RGUIMOD | keyboard::LGUIMOD);
imgui.set_key_ctrl(ctrl);
imgui.set_key_alt(alt);
imgui.set_key_shift(shift);
imgui.set_key_super(super_);
}
match event {
&Event::MouseWheel{y, ..} => {
imgui.set_mouse_wheel(y as f32);
},
&Event::MouseButtonDown{mouse_btn, ..} => {
if mouse_btn != MouseButton::Unknown {
let index = match mouse_btn {
MouseButton::Left => 0,
MouseButton::Right => 1,
MouseButton::Middle => 2,
MouseButton::X1 => 3,
MouseButton::X2 => 4,
MouseButton::Unknown => unreachable!(),
};
self.mouse_press[index] = true;
}
},
&Event::TextInput{ref text, .. } => {
for chr in text.chars() {
imgui.add_input_character(chr);
}
},
&Event::KeyDown{scancode, keymod, .. } => {
set_mod(imgui, keymod);
if let Some(scancode) = scancode {
imgui.set_key(scancode as u8, true);
}
},
&Event::KeyUp{scancode, keymod, .. } => {
set_mod(imgui, keymod);
if let Some(scancode) = scancode {
imgui.set_key(scancode as u8, false);
}
},
_ => {},
}
}
pub fn frame<'ui>(
&mut self,
window: &Window,
imgui: &'ui mut ImGui,
event_pump: &EventPump,
) -> imgui::Ui<'ui> {
let mouse_util = window.subsystem().sdl().mouse();
let mouse_state = event_pump.mouse_state();
let mouse_down = [
self.mouse_press[0] || mouse_state.left(),
self.mouse_press[1] || mouse_state.right(),
self.mouse_press[2] || mouse_state.middle(),
self.mouse_press[3] || mouse_state.x1(),
self.mouse_press[4] || mouse_state.x2(),
];
imgui.set_mouse_down(&mouse_down);
self.mouse_press = [false; 5];
let any_mouse_down = mouse_down.iter().any(|&b| b);
mouse_util.capture(any_mouse_down);
imgui.set_mouse_pos(mouse_state.x() as f32, mouse_state.y() as f32);
let now = Instant::now();
let delta = now - self.last_frame;
let delta_s = delta.as_secs() as f32 + delta.subsec_nanos() as f32 / 1_000_000_000.0;
self.last_frame = now;
let window_size = window.size();
let display_size = window.drawable_size();
let ui = imgui.frame(window_size, display_size, delta_s);
ui
}
}
pub extern "C" fn get_clipboard_text(_user_data: *mut c_void) -> *const c_char {
unsafe { sdl2_sys::SDL_GetClipboardText() }
}
pub extern "C" fn set_clipboard_text(_user_data: *mut c_void, text: *const c_char) {
unsafe { sdl2_sys::SDL_SetClipboardText(text) };
}