wm/vend/xgbutil/xinerama/xinerama.go

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2023-06-11 14:21:08 +00:00
package xinerama
import "sort"
import (
"github.com/jezek/xgb/xinerama"
"github.com/jezek/xgbutil"
"github.com/jezek/xgbutil/xrect"
)
// Alias so we use it as a receiver to satisfy sort.Interface
type Heads []xrect.Rect
// Len satisfies 'Len' in sort.Interface.
func (hds Heads) Len() int {
return len(hds)
}
// Less satisfies 'Less' in sort.Interface.
func (hds Heads) Less(i int, j int) bool {
return hds[i].X() < hds[j].X() || (hds[i].X() == hds[j].X() &&
hds[i].Y() < hds[j].Y())
}
// Swap does just that. Nothing to see here...
func (hds Heads) Swap(i int, j int) {
hds[i], hds[j] = hds[j], hds[i]
}
// PhyiscalHeads returns the list of heads in a physical ordering.
// Namely, left to right then top to bottom. (Defined by (X, Y).)
// Xinerama must have been initialized, otherwise the xinerama.QueryScreens
// request will panic.
// PhysicalHeads also checks to make sure each rectangle has a unique (x, y)
// tuple, so as not to return the geometry of cloned displays.
// (At present moment, xgbutil initializes Xinerama automatically during
// initial connection.)
func PhysicalHeads(xu *xgbutil.XUtil) (Heads, error) {
xinfo, err := xinerama.QueryScreens(xu.Conn()).Reply()
if err != nil {
return nil, err
}
hds := make(Heads, 0)
for _, info := range xinfo.ScreenInfo {
head := xrect.New(int(info.XOrg), int(info.YOrg),
int(info.Width), int(info.Height))
// Maybe Xinerama is enabled, but we have cloned displays...
unique := true
for _, h := range hds {
if h.X() == head.X() && h.Y() == head.Y() {
unique = false
break
}
}
if unique {
hds = append(hds, head)
}
}
sort.Sort(hds)
return hds, nil
}