mpv-disableIME

ime.lua

-- 取消mpv窗口与输入上下文的关联，达到禁用IME的效果
-- https://learn.microsoft.com/zh-cn/windows/win32/api/imm/nf-imm-immassociatecontext

local ffi_ok, ffi = pcall(require, 'ffi')
if not ffi_ok then return end

ffi.cdef[[
    typedef void*           HWND;
    typedef void*           HIMC;
    typedef int             BOOL;
    typedef unsigned int    DWORD;
    typedef unsigned int    LPDWORD[1];
    typedef int             LPARAM;
    typedef BOOL            (*WNDENUMPROC)(HWND, LPARAM);

    HIMC    ImmAssociateContext(HWND hwnd, HIMC himc);
    BOOL    ImmReleaseContext(HWND hwnd, HIMC himc);

    DWORD   GetCurrentThreadId();
    
    HWND    GetForegroundWindow();
    BOOL    EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam);
    DWORD   GetWindowThreadProcessId(HWND hwnd, LPDWORD lpdwProcessId);
    BOOL    AttachThreadInput(DWORD idAttach, DWORD idAttachTo, BOOL fAttach);
    HWND    SetFocus(HWND hWnd);
]]

local imm32    = ffi.load('imm32')
local kernel32 = ffi.load('kernel32')
local user32   = ffi.load('user32')

local mpv_pid = require('mp.utils').getpid()

-- https://mpv.io/manual/master/#lua-scripting-exit()
if not _G.exit then
    function exit() mp.keep_running = false end
end

-- 在首次获取焦点后执行，确保mpv窗口已经初始化
function on_focused_change(_, val)
    if not val then return end
    mp.unobserve_property(on_focused_change)
    disable_ime()
    exit()
end
mp.observe_property('focused', 'bool', on_focused_change)

-- 禁用mpv窗口的IME
function disable_ime()
    local mpv_hwnd = find_mpv_window()
    if not mpv_hwnd then return end
    -- 取消窗口与输入上下文的关联
    local himc = imm32.ImmAssociateContext(mpv_hwnd, nil)
    imm32.ImmReleaseContext(mpv_hwnd, himc)
    refocus(mpv_hwnd)
end

-- 查找mpv窗口句柄
function find_mpv_window()
    local mpv_hwnd = nil
    local foreground_hwnd = user32.GetForegroundWindow()
    if is_mpv_window(foreground_hwnd) then
        mpv_hwnd = foreground_hwnd
    else
        user32.EnumWindows(function(each_hwnd, _)
            if is_mpv_window(each_hwnd) then
                mpv_hwnd = each_hwnd
                return false
            end
            return true
        end, 0)
    end
    if not mpv_hwnd then mp.msg.warn('mpv window not found') end
    return mpv_hwnd
end

function is_mpv_window(hwnd)
    if not hwnd then return false end
    local lpdwProcessId = ffi.new('LPDWORD')
    user32.GetWindowThreadProcessId(hwnd, lpdwProcessId)
    return lpdwProcessId[0] == mpv_pid
end

-- 窗口重新获取输入焦点，触发IME状态刷新
function refocus(mpv_hwnd)
    local curr_tid = kernel32.GetCurrentThreadId()
    local mpv_tid = user32.GetWindowThreadProcessId(mpv_hwnd, _)
    user32.AttachThreadInput(curr_tid, mpv_tid, 1)
    user32.SetFocus(nil)
    user32.SetFocus(mpv_hwnd)
    user32.AttachThreadInput(curr_tid, mpv_tid, 0)
end