implement file drop API.

internal/desktop/drop.go

@@ -0,0 +1,24 @@
+package desktop
+
+import (
+	"time"
+	"demodesk/neko/internal/desktop/drop"
+)
+
+const (
+	DELAY = 100 * time.Millisecond
+)
+
+func (manager *DesktopManagerCtx) DropFiles(x int, y int, files []string) {
+	go drop.DragWindow(files)
+
+	// TODO: Find a bettter way.
+	time.Sleep(DELAY)
+	manager.Move(10, 10)
+	manager.ButtonDown(1)
+	manager.Move(x, y)
+	time.Sleep(DELAY)
+	manager.Move(x, y)
+	time.Sleep(DELAY)
+	manager.ButtonUp(1)
+}