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Diffstat (limited to 'nexgb/examples/randr/main.go')
-rw-r--r-- | nexgb/examples/randr/main.go | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/nexgb/examples/randr/main.go b/nexgb/examples/randr/main.go new file mode 100644 index 0000000..e349144 --- /dev/null +++ b/nexgb/examples/randr/main.go @@ -0,0 +1,92 @@ +// Example randr uses the randr protocol to get information about the active +// heads. It also listens for events that are sent when the head configuration +// changes. Since it listens to events, you'll have to manually kill this +// process when you're done (i.e., ctrl+c.) +// +// While this program is running, if you use 'xrandr' to reconfigure your +// heads, you should see event information dumped to standard out. +// +// For more information, please see the RandR protocol spec: +// http://www.x.org/releases/X11R7.6/doc/randrproto/randrproto.txt +package main + +import ( + "fmt" + "log" + + "github.com/BurntSushi/xgb" + "github.com/BurntSushi/xgb/randr" + "github.com/BurntSushi/xgb/xproto" +) + +func main() { + X, _ := xgb.NewConn() + + // Every extension must be initialized before it can be used. + err := randr.Init(X) + if err != nil { + log.Fatal(err) + } + + // Get the root window on the default screen. + root := xproto.Setup(X).DefaultScreen(X).Root + + // Gets the current screen resources. Screen resources contains a list + // of names, crtcs, outputs and modes, among other things. + resources, err := randr.GetScreenResources(X, root).Reply() + if err != nil { + log.Fatal(err) + } + + // Iterate through all of the outputs and show some of their info. + for _, output := range resources.Outputs { + info, err := randr.GetOutputInfo(X, output, 0).Reply() + if err != nil { + log.Fatal(err) + } + + if info.Connection == randr.ConnectionConnected { + bestMode := info.Modes[0] + for _, mode := range resources.Modes { + if mode.Id == uint32(bestMode) { + fmt.Printf("Width: %d, Height: %d\n", + mode.Width, mode.Height) + } + } + } + } + + fmt.Println("\n") + + // Iterate through all of the crtcs and show some of their info. + for _, crtc := range resources.Crtcs { + info, err := randr.GetCrtcInfo(X, crtc, 0).Reply() + if err != nil { + log.Fatal(err) + } + fmt.Printf("X: %d, Y: %d, Width: %d, Height: %d\n", + info.X, info.Y, info.Width, info.Height) + } + + // Tell RandR to send us events. (I think these are all of them, as of 1.3.) + err = randr.SelectInputChecked(X, root, + randr.NotifyMaskScreenChange| + randr.NotifyMaskCrtcChange| + randr.NotifyMaskOutputChange| + randr.NotifyMaskOutputProperty).Check() + if err != nil { + log.Fatal(err) + } + + // Listen to events and just dump them to standard out. + // A more involved approach will have to read the 'U' field of + // RandrNotifyEvent, which is a union (really a struct) of type + // RanrNotifyDataUnion. + for { + ev, err := X.WaitForEvent() + if err != nil { + log.Fatal(err) + } + fmt.Println(ev) + } +} |