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package moe.yuuta.aero
import kotlinx.cinterop.*
import platform.windows.*
fun main() {
SetProcessDPIAware()
val className = "Main Window Class"
memScoped {
val wc = cValue<WNDCLASSA> {
lpfnWndProc = staticCFunction(::windowProc)
this.hInstance = hInstance
lpszClassName = className.cstr.ptr
}
RegisterClassA(wc.ptr)
return@memScoped wc
}
val hwnd = CreateWindowExA(
0.convert(),
className,
"", // Filling texts will get the white background of the label
WS_OVERLAPPEDWINDOW.convert(),
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
null,
null,
WinCompat.hInstance,
null
)
if (hwnd == null) {
MessageBoxA(null,
"The system returns an empty dialog (${GetLastError()})",
"Aero",
(MB_OK or MB_ICONERROR).convert())
return
}
val result = DwmEnableComposition(DWM_EC_ENABLECOMPOSITION) and 0xFFFF
if (result != 0) {
MessageBoxA(hwnd,
"DwmEnableComposition() fail (0x${result.toString(16)})",
"Aero",
(MB_OK or MB_ICONERROR).convert())
}
ShowWindow(hwnd, WinCompat.nCmdShow)
WinApi.msgLoop()
}
fun windowProc(hwnd: HWND?,
uMsg: UINT,
wParam: WPARAM,
lParam: LPARAM): LRESULT {
return when (uMsg.convert<Int>()) {
WM_CREATE -> {
WinApi.setAero10(hwnd)
1
}
WM_DESTROY -> {
PostQuitMessage(0)
1
}
WM_ACTIVATE -> {
WinApi.setAero7(hwnd)
1
}
WM_PAINT -> {
val ps = nativeHeap.alloc<PAINTSTRUCT>()
val hdc = BeginPaint(hwnd, ps.ptr)
FillRect(hdc,
ps.rcPaint.ptr,
GetStockObject(BLACK_BRUSH) as HBRUSH)
EndPaint(hwnd, ps.ptr)
nativeHeap.free(ps)
1
}
else -> {
DefWindowProcA(hwnd, uMsg, wParam, lParam)
}
}
}
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