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