github.com/robotn/xgb@v0.0.0-20190912153532-2cb92d044934/examples/xinerama/main.go (about)

     1  // Example xinerama shows how to query the geometry of all active heads.
     2  package main
     3  
     4  import (
     5  	"fmt"
     6  	"log"
     7  
     8  	"github.com/robotn/xgb"
     9  	"github.com/robotn/xgb/xinerama"
    10  )
    11  
    12  func main() {
    13  	X, err := xgb.NewConn()
    14  	if err != nil {
    15  		log.Fatal(err)
    16  	}
    17  
    18  	// Initialize the Xinerama extension.
    19  	// The appropriate 'Init' function must be run for *every*
    20  	// extension before any of its requests can be used.
    21  	err = xinerama.Init(X)
    22  	if err != nil {
    23  		log.Fatal(err)
    24  	}
    25  
    26  	// Issue a request to get the screen information.
    27  	reply, err := xinerama.QueryScreens(X).Reply()
    28  	if err != nil {
    29  		log.Fatal(err)
    30  	}
    31  
    32  	// reply.Number is the number of active heads, while reply.ScreenInfo
    33  	// is a slice of XineramaScreenInfo containing the rectangle geometry
    34  	// of each head.
    35  	fmt.Printf("Number of heads: %d\n", reply.Number)
    36  	for i, screen := range reply.ScreenInfo {
    37  		fmt.Printf("%d :: X: %d, Y: %d, Width: %d, Height: %d\n",
    38  			i, screen.XOrg, screen.YOrg, screen.Width, screen.Height)
    39  	}
    40  }