// setupEventHandlers attaches the canvas' channels to the window and
// sets the appropriate callbacks to some events:
// ConfigureNotify events will cause the window to update its state of geometry.
// Expose events will cause the window to repaint the current image.
// Button events to allow panning.
// Key events to perform various tasks when certain keys are pressed.
func (w *Window) setupEventHandlers(chans chans) {
w.Listen(xproto.EventMaskStructureNotify | xproto.EventMaskExposure |
xproto.EventMaskButtonPress | xproto.EventMaskButtonRelease | xproto.EventMaskKeyPress)
// Get the current geometry in case we don't get a ConfigureNotify event
// (or have already missed it).
if _, err := w.Geometry(); err != nil {
errLg.Fatal(err)
}
// Keep a state of window geometry.
xevent.ConfigureNotifyFun(
func(X *xgbutil.XUtil, ev xevent.ConfigureNotifyEvent) {
w.Geom.WidthSet(int(ev.Width))
w.Geom.HeightSet(int(ev.Height))
}).Connect(w.X, w.Id)
// Repaint the window on expose events.
xevent.ExposeFun(
func(X *xgbutil.XUtil, ev xevent.ExposeEvent) {
chans.ctl <- []string{"pan", "origin"}
}).Connect(w.X, w.Id)
// Setup a drag handler to allow panning.
mousebind.Drag(w.X, w.Id, w.Id, "1", false,
func(X *xgbutil.XUtil, rx, ry, ex, ey int) (bool, xproto.Cursor) {
chans.panStartChan <- image.Point{ex, ey}
return true, 0
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {
chans.panStepChan <- image.Point{ex, ey}
},
// We do nothing on mouse release
func(X *xgbutil.XUtil, rx, ry, ex, ey int) { return })
for _, kb := range keybinds {
k := kb // Needed because the callback closure will capture kb
err := keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
chans.ctl <- k.command
}).Connect(w.X, w.Id, k.key, false)
if err != nil {
errLg.Println(err)
}
}
}
// setupEventHandlers attaches the canvas' channels to the window and
// sets the appropriate callbacks to some events:
// ConfigureNotify events will cause the window to update its state of geometry.
// Expose events will cause the window to repaint the current image.
// Button events to allow panning.
// Key events to perform various tasks when certain keys are pressed. Should
// these be configurable? Meh.
func (w *window) setupEventHandlers(chans chans) {
w.chans = chans
w.Listen(xproto.EventMaskStructureNotify | xproto.EventMaskExposure |
xproto.EventMaskButtonPress | xproto.EventMaskButtonRelease |
xproto.EventMaskKeyPress)
// Get the current geometry in case we don't get a ConfigureNotify event
// (or have already missed it).
_, err := w.Geometry()
if err != nil {
errLg.Fatal(err)
}
// And ask the canvas to draw the first image when it gets around to it.
go func() {
w.chans.drawChan <- func(origin image.Point) image.Point {
return image.Point{}
}
}()
// Keep a state of window geometry.
xevent.ConfigureNotifyFun(
func(X *xgbutil.XUtil, ev xevent.ConfigureNotifyEvent) {
w.Geom.WidthSet(int(ev.Width))
w.Geom.HeightSet(int(ev.Height))
}).Connect(w.X, w.Id)
// Repaint the window on expose events.
xevent.ExposeFun(
func(X *xgbutil.XUtil, ev xevent.ExposeEvent) {
w.chans.drawChan <- func(origin image.Point) image.Point {
return origin
}
}).Connect(w.X, w.Id)
// Setup a drag handler to allow panning.
mousebind.Drag(w.X, w.Id, w.Id, "1", false,
func(X *xgbutil.XUtil, rx, ry, ex, ey int) (bool, xproto.Cursor) {
w.chans.panStartChan <- image.Point{ex, ey}
return true, 0
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {
w.chans.panStepChan <- image.Point{ex, ey}
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {
w.chans.panEndChan <- image.Point{ex, ey}
})
// Set up a map of keybindings to avoid a lot of boiler plate.
// for keystring, fun := range kbs {
for _, keyb := range keybinds {
keyb := keyb
err := keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
keyb.action(w)
}).Connect(w.X, w.Id, keyb.key, false)
if err != nil {
errLg.Println(err)
}
}
}
func makeWindow(ximage *xgraphics.Image) (*xwindow.Window, *bool) {
w, h := ximage.Rect.Dx(), ximage.Rect.Dy()
window, err := xwindow.Generate(ximage.X)
if err != nil {
xgbutil.Logger.Printf("Could not generate new window id: %s", err)
return nil, nil
}
window.Create(ximage.X.RootWin(), 0, 0, w, h, xproto.CwBackPixel, 0x00000000)
window.Listen(xproto.EventMaskExposure,
xproto.EventMaskKeyPress,
xproto.EventMaskStructureNotify,
xproto.EventMaskVisibilityChange)
window.WMGracefulClose(func(w *xwindow.Window) {
xevent.Detach(w.X, w.Id)
keybind.Detach(w.X, w.Id)
mousebind.Detach(w.X, w.Id)
w.Destroy()
xevent.Quit(w.X)
})
err = icccm.WmStateSet(ximage.X, window.Id, &icccm.WmState{
State: icccm.StateNormal,
})
if err != nil {
xgbutil.Logger.Printf("Could not set WM_STATE: %s", err)
}
err = ewmh.WmNameSet(ximage.X, window.Id, "Computer System Monitor")
if err != nil {
xgbutil.Logger.Printf("Could not set _NET_WM_NAME: %s", err)
}
err = keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
err := ewmh.WmStateReq(ximage.X, window.Id, ewmh.StateToggle,
"_NET_WM_STATE_FULLSCREEN")
if err != nil {
log.Fatal(err)
}
}).Connect(ximage.X, window.Id, "f", false)
if err != nil {
log.Fatal(err)
}
xevent.ExposeFun(
func(xu *xgbutil.XUtil, event xevent.ExposeEvent) {
ximage.XExpPaint(window.Id, 0, 0)
}).Connect(ximage.X, window.Id)
obscured := false
xevent.VisibilityNotifyFun(
func(xu *xgbutil.XUtil, event xevent.VisibilityNotifyEvent) {
obscured = event.State == xproto.VisibilityFullyObscured
}).Connect(ximage.X, window.Id)
window.Map()
return window, &obscured
}