chore: release v0.21.3

screenbounds_windows.go

@@ -0,0 +1,36 @@
+//go:build windows
+
+package main
+
+import "syscall"
+
+// GetSystemMetrics indices for the virtual desktop — the rectangle spanning
+// every attached monitor. Wails' ScreenGetAll reports each monitor's size but
+// not its offset, so it cannot answer "is this coordinate on any screen?"; the
+// Win32 metrics can.
+const (
+	smXVirtualScreen  = 76
+	smYVirtualScreen  = 77
+	smCXVirtualScreen = 78
+	smCYVirtualScreen = 79
+)
+
+var (
+	user32Dll            = syscall.NewLazyDLL("user32.dll")
+	procGetSystemMetrics = user32Dll.NewProc("GetSystemMetrics")
+)
+
+func systemMetric(index int) int {
+	r, _, _ := procGetSystemMetrics.Call(uintptr(index))
+	return int(int32(r)) // signed: the virtual desktop origin is negative with a monitor to the left
+}
+
+// virtualScreenBounds returns the rectangle covering all monitors, and whether
+// it could be determined at all.
+func virtualScreenBounds() (x, y, w, h int, ok bool) {
+	w, h = systemMetric(smCXVirtualScreen), systemMetric(smCYVirtualScreen)
+	if w <= 0 || h <= 0 {
+		return 0, 0, 0, 0, false
+	}
+	return systemMetric(smXVirtualScreen), systemMetric(smYVirtualScreen), w, h, true
+}