62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// Example get-active-window reads the _NET_ACTIVE_WINDOW property of the root
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// window and uses the result (a window id) to get the name of the window.
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package main
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import (
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"fmt"
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"log"
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xgb "janouch.name/haven/nexgb"
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"janouch.name/haven/nexgb/xproto"
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)
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func main() {
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X, err := xgb.NewConn()
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if err != nil {
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log.Fatal(err)
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}
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// Get the window id of the root window.
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setup := xproto.Setup(X)
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root := setup.DefaultScreen(X).Root
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// Get the atom id (i.e., intern an atom) of "_NET_ACTIVE_WINDOW".
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aname := "_NET_ACTIVE_WINDOW"
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activeAtom, err := xproto.InternAtom(X, true, uint16(len(aname)),
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aname).Reply()
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if err != nil {
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log.Fatal(err)
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}
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// Get the atom id (i.e., intern an atom) of "_NET_WM_NAME".
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aname = "_NET_WM_NAME"
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nameAtom, err := xproto.InternAtom(X, true, uint16(len(aname)),
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aname).Reply()
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if err != nil {
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log.Fatal(err)
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}
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// Get the actual value of _NET_ACTIVE_WINDOW.
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// Note that 'reply.Value' is just a slice of bytes, so we use an
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// XGB helper function, 'Get32', to pull an unsigned 32-bit integer out
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// of the byte slice. We then convert it to an X resource id so it can
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// be used to get the name of the window in the next GetProperty request.
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reply, err := xproto.GetProperty(X, false, root, activeAtom.Atom,
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xproto.GetPropertyTypeAny, 0, (1<<32)-1).Reply()
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if err != nil {
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log.Fatal(err)
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}
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windowId := xproto.Window(xgb.Get32(reply.Value))
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fmt.Printf("Active window id: %X\n", windowId)
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// Now get the value of _NET_WM_NAME for the active window.
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// Note that this time, we simply convert the resulting byte slice,
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// reply.Value, to a string.
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reply, err = xproto.GetProperty(X, false, windowId, nameAtom.Atom,
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xproto.GetPropertyTypeAny, 0, (1<<32)-1).Reply()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Active window name: %s\n", string(reply.Value))
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}
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