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lib.rs
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lib.rs
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extern crate sdl2;
extern crate imgui;
use sdl2::video::Window;
use sdl2::mouse::{Cursor,SystemCursor,MouseState};
use sdl2::keyboard::Scancode;
use imgui::{Context,MouseCursor,Key,ConfigFlags};
use sdl2::event::Event;
pub struct ImguiSdl2 {
mouse_press: [bool; 5],
ignore_mouse: bool,
ignore_keyboard: bool,
cursor: Option<MouseCursor>,
sdl_cursor: Option<Cursor>,
}
struct Sdl2ClipboardBackend(sdl2::clipboard::ClipboardUtil);
impl imgui::ClipboardBackend for Sdl2ClipboardBackend {
fn get(&mut self) -> Option<imgui::ImString> {
if !self.0.has_clipboard_text() { return None; }
self.0.clipboard_text().ok().map(imgui::ImString::new)
}
fn set(&mut self, value: &imgui::ImStr) {
let _ = self.0.set_clipboard_text(value.to_str());
}
}
impl ImguiSdl2 {
pub fn new(
imgui: &mut Context,
window: &Window,
) -> Self {
let clipboard_util = window.subsystem().clipboard();
imgui.set_clipboard_backend(Box::new(Sdl2ClipboardBackend(clipboard_util)));
imgui.io_mut().key_map[Key::Tab as usize] = Scancode::Tab as u32;
imgui.io_mut().key_map[Key::LeftArrow as usize] = Scancode::Left as u32;
imgui.io_mut().key_map[Key::RightArrow as usize] = Scancode::Right as u32;
imgui.io_mut().key_map[Key::UpArrow as usize] = Scancode::Up as u32;
imgui.io_mut().key_map[Key::DownArrow as usize] = Scancode::Down as u32;
imgui.io_mut().key_map[Key::PageUp as usize] = Scancode::PageUp as u32;
imgui.io_mut().key_map[Key::PageDown as usize] = Scancode::PageDown as u32;
imgui.io_mut().key_map[Key::Home as usize] = Scancode::Home as u32;
imgui.io_mut().key_map[Key::End as usize] = Scancode::End as u32;
imgui.io_mut().key_map[Key::Delete as usize] = Scancode::Delete as u32;
imgui.io_mut().key_map[Key::Backspace as usize] = Scancode::Backspace as u32;
imgui.io_mut().key_map[Key::Enter as usize] = Scancode::Return as u32;
imgui.io_mut().key_map[Key::Escape as usize] = Scancode::Escape as u32;
imgui.io_mut().key_map[Key::Space as usize] = Scancode::Space as u32;
imgui.io_mut().key_map[Key::A as usize] = Scancode::A as u32;
imgui.io_mut().key_map[Key::C as usize] = Scancode::C as u32;
imgui.io_mut().key_map[Key::V as usize] = Scancode::V as u32;
imgui.io_mut().key_map[Key::X as usize] = Scancode::X as u32;
imgui.io_mut().key_map[Key::Y as usize] = Scancode::Y as u32;
imgui.io_mut().key_map[Key::Z as usize] = Scancode::Z as u32;
Self {
mouse_press: [false; 5],
ignore_keyboard: false,
ignore_mouse: false,
cursor: None,
sdl_cursor: None,
}
}
pub fn ignore_event(
&self,
event: &Event,
) -> bool {
match *event {
Event::KeyDown{..}
| Event::KeyUp{..}
| Event::TextEditing{..}
| Event::TextInput{..}
=> self.ignore_keyboard,
Event::MouseMotion{..}
| Event::MouseButtonDown{..}
| Event::MouseButtonUp{..}
| Event::MouseWheel{..}
| Event::FingerDown{..}
| Event::FingerUp{..}
| Event::FingerMotion{..}
| Event::DollarGesture{..}
| Event::DollarRecord{..}
| Event::MultiGesture{..}
=> self.ignore_mouse,
_ => false,
}
}
pub fn handle_event(
&mut self,
imgui: &mut Context,
event: &Event,
) {
use sdl2::mouse::MouseButton;
use sdl2::keyboard;
fn set_mod(imgui: &mut Context, keymod: keyboard::Mod) {
let ctrl = keymod.intersects(keyboard::Mod::RCTRLMOD | keyboard::Mod::LCTRLMOD);
let alt = keymod.intersects(keyboard::Mod::RALTMOD | keyboard::Mod::LALTMOD);
let shift = keymod.intersects(keyboard::Mod::RSHIFTMOD | keyboard::Mod::LSHIFTMOD);
let super_ = keymod.intersects(keyboard::Mod::RGUIMOD | keyboard::Mod::LGUIMOD);
imgui.io_mut().key_ctrl = ctrl;
imgui.io_mut().key_alt = alt;
imgui.io_mut().key_shift = shift;
imgui.io_mut().key_super = super_;
}
match *event {
Event::MouseWheel{y, ..} => {
imgui.io_mut().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.io_mut().add_input_character(chr);
}
},
Event::KeyDown{scancode, keymod, .. } => {
set_mod(imgui, keymod);
if let Some(scancode) = scancode {
imgui.io_mut().keys_down[scancode as usize] = true;
}
},
Event::KeyUp{scancode, keymod, .. } => {
set_mod(imgui, keymod);
if let Some(scancode) = scancode {
imgui.io_mut().keys_down[scancode as usize] = false;
}
},
_ => {},
}
}
pub fn prepare_frame(
&mut self,
io: &mut imgui::Io,
window: &Window,
mouse_state: &MouseState,
) {
let mouse_util = window.subsystem().sdl().mouse();
let (win_w, win_h) = window.size();
let (draw_w, draw_h) = window.drawable_size();
io.display_size = [win_w as f32, win_h as f32];
io.display_framebuffer_scale = [
(draw_w as f32) / (win_w as f32),
(draw_h as f32) / (win_h as f32),
];
// Merging the mousedown events we received into the current state prevents us from missing
// clicks that happen faster than a frame
io.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(),
];
self.mouse_press = [false; 5];
let any_mouse_down = io.mouse_down.iter().any(|&b| b);
mouse_util.capture(any_mouse_down);
io.mouse_pos = [mouse_state.x() as f32, mouse_state.y() as f32];
self.ignore_keyboard = io.want_capture_keyboard;
self.ignore_mouse = io.want_capture_mouse;
}
pub fn prepare_render(
&mut self,
ui: &imgui::Ui,
window: &Window,
) {
let io = ui.io();
if !io.config_flags.contains(ConfigFlags::NO_MOUSE_CURSOR_CHANGE) {
let mouse_util = window.subsystem().sdl().mouse();
match ui.mouse_cursor() {
Some(mouse_cursor) if !io.mouse_draw_cursor => {
mouse_util.show_cursor(true);
let sdl_cursor = match mouse_cursor {
MouseCursor::Arrow => SystemCursor::Arrow,
MouseCursor::TextInput => SystemCursor::IBeam,
MouseCursor::ResizeAll => SystemCursor::SizeAll,
MouseCursor::ResizeNS => SystemCursor::SizeNS,
MouseCursor::ResizeEW => SystemCursor::SizeWE,
MouseCursor::ResizeNESW => SystemCursor::SizeNESW,
MouseCursor::ResizeNWSE => SystemCursor::SizeNWSE,
MouseCursor::Hand => SystemCursor::Hand,
MouseCursor::NotAllowed => SystemCursor::No,
};
if self.cursor != Some(mouse_cursor) {
let sdl_cursor = Cursor::from_system(sdl_cursor).unwrap();
sdl_cursor.set();
self.cursor = Some(mouse_cursor);
self.sdl_cursor = Some(sdl_cursor);
}
}
_ => {
self.cursor = None;
self.sdl_cursor = None;
mouse_util.show_cursor(false);
}
}
}
}
}