From dc48249e1acea54b391f53b95f16e515dead7c97 Mon Sep 17 00:00:00 2001
From: "Andrew Gallant (Ocelot)" <Andrew.Gallant@tufts.edu>
Date: Mon, 7 May 2012 04:09:19 -0400
Subject: lots of docs and examples

---
 nexgb/examples/randr/main.go | 84 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 nexgb/examples/randr/main.go

(limited to 'nexgb/examples/randr/main.go')

diff --git a/nexgb/examples/randr/main.go b/nexgb/examples/randr/main.go
new file mode 100644
index 0000000..5c56609
--- /dev/null
+++ b/nexgb/examples/randr/main.go
@@ -0,0 +1,84 @@
+// 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"
+)
+
+func main() {
+	X, _ := xgb.NewConn()
+
+	// Every extension must be initialized before it can be used.
+	err := X.RandrInit()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Gets the current screen resources. Screen resources contains a list
+	// of names, crtcs, outputs and modes, among other things.
+	resources, err := X.RandrGetScreenResources(X.DefaultScreen().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 := X.RandrGetOutputInfo(output, 0).Reply()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		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 := X.RandrGetCrtcInfo(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 = X.RandrSelectInputChecked(X.DefaultScreen().Root,
+		xgb.RandrNotifyMaskScreenChange|
+			xgb.RandrNotifyMaskCrtcChange|
+			xgb.RandrNotifyMaskOutputChange|
+			xgb.RandrNotifyMaskOutputProperty).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)
+	}
+}
-- 
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