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|
use std::rc::Rc;
use std::cell::RefCell;
use std::sync::mpsc::{Sender, Receiver, channel};
use Event;
use super::event;
use user32;
use winapi;
/// Stores the current window and its events dispatcher.
///
/// We only have one window per thread. We still store the HWND in case where we
/// receive an event for another window.
thread_local!(pub static WINDOW: Rc<RefCell<Option<(winapi::HWND, Sender<Event>)>>> = Rc::new(RefCell::new(None)));
/// Checks that the window is the good one, and if so send the event to it.
fn send_event(input_window: winapi::HWND, event: Event) {
WINDOW.with(|window| {
let window = window.borrow();
let stored = match *window {
None => return,
Some(ref v) => v
};
let &(ref win, ref sender) = stored;
if win != &input_window {
return;
}
sender.send(event).ok(); // ignoring if closed
});
}
/// This is the callback that is called by `DispatchMessage` in the events loop.
///
/// Returning 0 tells the Win32 API that the message has been processed.
pub extern "system" fn callback(window: winapi::HWND, msg: winapi::UINT,
wparam: winapi::WPARAM, lparam: winapi::LPARAM) -> winapi::LRESULT
{
match msg {
winapi::WM_DESTROY => {
use events::Event::Closed;
WINDOW.with(|w| {
let w = w.borrow();
let &(ref win, _) = match *w {
None => return,
Some(ref v) => v
};
if win == &window {
unsafe { user32::PostQuitMessage(0); }
}
});
send_event(window, Closed);
0
},
winapi::WM_ERASEBKGND => {
1
},
winapi::WM_SIZE => {
use events::Event::Resized;
let w = winapi::LOWORD(lparam as winapi::DWORD) as u32;
let h = winapi::HIWORD(lparam as winapi::DWORD) as u32;
send_event(window, Resized(w, h));
0
},
winapi::WM_MOVE => {
use events::Event::Moved;
let x = winapi::LOWORD(lparam as winapi::DWORD) as i32;
let y = winapi::HIWORD(lparam as winapi::DWORD) as i32;
send_event(window, Moved(x, y));
0
},
winapi::WM_CHAR => {
use std::mem;
use events::Event::ReceivedCharacter;
let chr: char = unsafe { mem::transmute(wparam as u32) };
send_event(window, ReceivedCharacter(chr));
0
},
winapi::WM_MOUSEMOVE => {
use events::Event::MouseMoved;
let x = winapi::GET_X_LPARAM(lparam) as i32;
let y = winapi::GET_Y_LPARAM(lparam) as i32;
send_event(window, MouseMoved((x, y)));
0
},
winapi::WM_MOUSEWHEEL => {
use events::Event::MouseWheel;
let value = (wparam >> 16) as i16;
let value = value as i32;
send_event(window, MouseWheel(value));
0
},
winapi::WM_KEYDOWN => {
use events::Event::KeyboardInput;
use events::ElementState::Pressed;
let scancode = ((lparam >> 16) & 0xff) as u8;
let vkey = event::vkeycode_to_element(wparam);
send_event(window, KeyboardInput(Pressed, scancode, vkey));
0
},
winapi::WM_KEYUP => {
use events::Event::KeyboardInput;
use events::ElementState::Released;
let scancode = ((lparam >> 16) & 0xff) as u8;
let vkey = event::vkeycode_to_element(wparam);
send_event(window, KeyboardInput(Released, scancode, vkey));
0
},
winapi::WM_LBUTTONDOWN => {
use events::Event::MouseInput;
use events::MouseButton::Left;
use events::ElementState::Pressed;
send_event(window, MouseInput(Pressed, Left));
0
},
winapi::WM_LBUTTONUP => {
use events::Event::MouseInput;
use events::MouseButton::Left;
use events::ElementState::Released;
send_event(window, MouseInput(Released, Left));
0
},
winapi::WM_RBUTTONDOWN => {
use events::Event::MouseInput;
use events::MouseButton::Right;
use events::ElementState::Pressed;
send_event(window, MouseInput(Pressed, Right));
0
},
winapi::WM_RBUTTONUP => {
use events::Event::MouseInput;
use events::MouseButton::Right;
use events::ElementState::Released;
send_event(window, MouseInput(Released, Right));
0
},
winapi::WM_MBUTTONDOWN => {
use events::Event::MouseInput;
use events::MouseButton::Middle;
use events::ElementState::Pressed;
send_event(window, MouseInput(Pressed, Middle));
0
},
winapi::WM_MBUTTONUP => {
use events::Event::MouseInput;
use events::MouseButton::Middle;
use events::ElementState::Released;
send_event(window, MouseInput(Released, Middle));
0
},
winapi::WM_SETFOCUS => {
use events::Event::Focused;
send_event(window, Focused(true));
0
},
winapi::WM_KILLFOCUS => {
use events::Event::Focused;
send_event(window, Focused(false));
0
},
_ => unsafe {
user32::DefWindowProcW(window, msg, wparam, lparam)
}
}
}
|
