windows-screen.ts

import {
	SM_CXSCREEN,
	SM_CYSCREEN,
	GetSystemMetrics,
	SPI_GETWORKAREA,
	SystemParametersInfoA,
} from "https://win32.deno.dev/0.4.1/UI.WindowsAndMessaging";
import {
	allocRECT,
	RECTView,
} from "https://win32.deno.dev/0.4.1/Graphics.Dwm";

export function screen() {
	return {
		// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getsystemmetrics
		width: GetSystemMetrics(SM_CXSCREEN),
		height: GetSystemMetrics(SM_CYSCREEN),
	};
}

export function workArea(): { top: number, bottom: number, left: number, right: number } {
	// https://learn.microsoft.com/en-us/windows/win32/api/windef/ns-windef-rect
	const rect = allocRECT();
	const rectView = new RECTView(rect);
	// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-systemparametersinfoa
	const success = SystemParametersInfoA(SPI_GETWORKAREA, 0, rect, 0);
	if (!success) {
		throw new Error(`Failed to query work area`);
	}
	return {
		top: rectView.top,
		bottom: rectView.bottom,
		left: rectView.left,
		right: rectView.right,
	};
}