353 lines
8.7 KiB
Go
353 lines
8.7 KiB
Go
package x
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/elements"
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import "github.com/jezek/xgbutil"
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import "github.com/jezek/xgb/xproto"
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import "github.com/jezek/xgbutil/xevent"
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type scrollSum struct {
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x, y int
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}
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const scrollDistance = 16
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func (sum *scrollSum) add (button xproto.Button, window *window, state uint16) {
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shift :=
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(state & xproto.ModMaskShift) > 0 ||
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(state & window.backend.modifierMasks.shiftLock) > 0
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if shift {
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switch button {
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case 4:
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sum.x -= scrollDistance
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case 5:
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sum.x += scrollDistance
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case 6:
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sum.y -= scrollDistance
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case 7:
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sum.y += scrollDistance
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}
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} else {
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switch button {
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case 4:
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sum.y -= scrollDistance
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case 5:
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sum.y += scrollDistance
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case 6:
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sum.x -= scrollDistance
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case 7:
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sum.x += scrollDistance
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}
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}
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}
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func (window *window) handleExpose (
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connection *xgbutil.XUtil,
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event xevent.ExposeEvent,
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) {
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_, region := window.compressExpose(*event.ExposeEvent)
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window.pushRegion(region)
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}
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func (window *window) handleConfigureNotify (
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connection *xgbutil.XUtil,
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event xevent.ConfigureNotifyEvent,
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) {
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if window.child == nil { return }
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configureEvent := *event.ConfigureNotifyEvent
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newWidth := int(configureEvent.Width)
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newHeight := int(configureEvent.Height)
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sizeChanged :=
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window.metrics.width != newWidth ||
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window.metrics.height != newHeight
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window.metrics.width = newWidth
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window.metrics.height = newHeight
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if sizeChanged {
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configureEvent = window.compressConfigureNotify(configureEvent)
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window.metrics.width = int(configureEvent.Width)
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window.metrics.height = int(configureEvent.Height)
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window.reallocateCanvas()
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window.resizeChildToFit()
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if !window.exposeEventFollows(configureEvent) {
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window.redrawChildEntirely()
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}
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}
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}
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func (window *window) exposeEventFollows (event xproto.ConfigureNotifyEvent) (found bool) {
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nextEvents := xevent.Peek(window.backend.connection)
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if len(nextEvents) > 0 {
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untypedEvent := nextEvents[0]
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if untypedEvent.Err == nil {
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typedEvent, ok :=
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untypedEvent.Event.(xproto.ConfigureNotifyEvent)
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if ok && typedEvent.Window == event.Window {
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return true
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}
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}
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}
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return false
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}
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func (window *window) modifiersFromState (
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state uint16,
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) (
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modifiers input.Modifiers,
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) {
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return input.Modifiers {
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Shift:
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(state & xproto.ModMaskShift) > 0 ||
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(state & window.backend.modifierMasks.shiftLock) > 0,
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Control: (state & xproto.ModMaskControl) > 0,
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Alt: (state & window.backend.modifierMasks.alt) > 0,
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Meta: (state & window.backend.modifierMasks.meta) > 0,
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Super: (state & window.backend.modifierMasks.super) > 0,
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Hyper: (state & window.backend.modifierMasks.hyper) > 0,
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}
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}
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func (window *window) handleKeyPress (
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connection *xgbutil.XUtil,
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event xevent.KeyPressEvent,
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) {
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if window.child == nil { return }
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keyEvent := *event.KeyPressEvent
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key, numberPad := window.backend.keycodeToKey(keyEvent.Detail, keyEvent.State)
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modifiers := window.modifiersFromState(keyEvent.State)
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modifiers.NumberPad = numberPad
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if key == input.KeyTab && modifiers.Alt {
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if child, ok := window.child.(elements.Focusable); ok {
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direction := input.KeynavDirectionForward
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if modifiers.Shift {
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direction = input.KeynavDirectionBackward
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}
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if !child.HandleFocus(direction) {
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child.HandleUnfocus()
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}
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}
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} else if child, ok := window.child.(elements.KeyboardTarget); ok {
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child.HandleKeyDown(key, modifiers)
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}
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}
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func (window *window) handleKeyRelease (
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connection *xgbutil.XUtil,
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event xevent.KeyReleaseEvent,
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) {
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if window.child == nil { return }
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keyEvent := *event.KeyReleaseEvent
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// do not process this event if it was generated from a key repeat
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nextEvents := xevent.Peek(window.backend.connection)
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if len(nextEvents) > 0 {
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untypedEvent := nextEvents[0]
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if untypedEvent.Err == nil {
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typedEvent, ok :=
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untypedEvent.Event.(xproto.KeyPressEvent)
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if ok && typedEvent.Detail == keyEvent.Detail &&
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typedEvent.Event == keyEvent.Event &&
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typedEvent.State == keyEvent.State {
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return
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}
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}
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}
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key, numberPad := window.backend.keycodeToKey(keyEvent.Detail, keyEvent.State)
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modifiers := window.modifiersFromState(keyEvent.State)
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modifiers.NumberPad = numberPad
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if child, ok := window.child.(elements.KeyboardTarget); ok {
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child.HandleKeyUp(key, modifiers)
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}
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}
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func (window *window) handleButtonPress (
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connection *xgbutil.XUtil,
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event xevent.ButtonPressEvent,
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) {
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if window.child == nil { return }
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buttonEvent := *event.ButtonPressEvent
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if buttonEvent.Detail >= 4 && buttonEvent.Detail <= 7 {
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if child, ok := window.child.(elements.ScrollTarget); ok {
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sum := scrollSum { }
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sum.add(buttonEvent.Detail, window, buttonEvent.State)
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window.compressScrollSum(buttonEvent, &sum)
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child.HandleScroll (
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int(buttonEvent.EventX),
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int(buttonEvent.EventY),
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float64(sum.x), float64(sum.y))
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}
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} else {
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if child, ok := window.child.(elements.MouseTarget); ok {
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child.HandleMouseDown (
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int(buttonEvent.EventX),
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int(buttonEvent.EventY),
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input.Button(buttonEvent.Detail))
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}
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}
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}
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func (window *window) handleButtonRelease (
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connection *xgbutil.XUtil,
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event xevent.ButtonReleaseEvent,
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) {
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if window.child == nil { return }
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if child, ok := window.child.(elements.MouseTarget); ok {
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buttonEvent := *event.ButtonReleaseEvent
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if buttonEvent.Detail >= 4 && buttonEvent.Detail <= 7 { return }
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child.HandleMouseUp (
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int(buttonEvent.EventX),
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int(buttonEvent.EventY),
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input.Button(buttonEvent.Detail))
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}
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}
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func (window *window) handleMotionNotify (
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connection *xgbutil.XUtil,
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event xevent.MotionNotifyEvent,
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) {
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if window.child == nil { return }
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if child, ok := window.child.(elements.MotionTarget); ok {
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motionEvent := window.compressMotionNotify(*event.MotionNotifyEvent)
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child.HandleMotion (
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int(motionEvent.EventX),
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int(motionEvent.EventY))
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}
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}
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func (window *window) compressExpose (
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firstEvent xproto.ExposeEvent,
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) (
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lastEvent xproto.ExposeEvent,
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region image.Rectangle,
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) {
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region = image.Rect (
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int(firstEvent.X), int(firstEvent.Y),
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int(firstEvent.X + firstEvent.Width),
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int(firstEvent.Y + firstEvent.Height))
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window.backend.connection.Sync()
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xevent.Read(window.backend.connection, false)
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lastEvent = firstEvent
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for index, untypedEvent := range xevent.Peek(window.backend.connection) {
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if untypedEvent.Err != nil { continue }
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typedEvent, ok := untypedEvent.Event.(xproto.ExposeEvent)
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if !ok { continue }
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if firstEvent.Window == typedEvent.Window {
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region = region.Union (image.Rect (
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int(typedEvent.X), int(typedEvent.Y),
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int(typedEvent.X + typedEvent.Width),
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int(typedEvent.Y + typedEvent.Height)))
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lastEvent = typedEvent
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defer func (index int) {
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xevent.DequeueAt(window.backend.connection, index)
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} (index)
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}
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}
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return
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}
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func (window *window) compressConfigureNotify (
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firstEvent xproto.ConfigureNotifyEvent,
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) (
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lastEvent xproto.ConfigureNotifyEvent,
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) {
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window.backend.connection.Sync()
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xevent.Read(window.backend.connection, false)
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lastEvent = firstEvent
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for index, untypedEvent := range xevent.Peek(window.backend.connection) {
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if untypedEvent.Err != nil { continue }
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typedEvent, ok := untypedEvent.Event.(xproto.ConfigureNotifyEvent)
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if !ok { continue }
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if firstEvent.Event == typedEvent.Event &&
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firstEvent.Window == typedEvent.Window {
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lastEvent = typedEvent
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defer func (index int) {
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xevent.DequeueAt(window.backend.connection, index)
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} (index)
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}
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}
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return
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}
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func (window *window) compressScrollSum (
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firstEvent xproto.ButtonPressEvent,
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sum *scrollSum,
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) {
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window.backend.connection.Sync()
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xevent.Read(window.backend.connection, false)
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for index, untypedEvent := range xevent.Peek(window.backend.connection) {
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if untypedEvent.Err != nil { continue }
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typedEvent, ok := untypedEvent.Event.(xproto.ButtonPressEvent)
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if !ok { continue }
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if firstEvent.Event == typedEvent.Event &&
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typedEvent.Detail >= 4 &&
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typedEvent.Detail <= 7 {
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sum.add(typedEvent.Detail, window, typedEvent.State)
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defer func (index int) {
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xevent.DequeueAt(window.backend.connection, index)
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} (index)
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}
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}
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return
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}
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func (window *window) compressMotionNotify (
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firstEvent xproto.MotionNotifyEvent,
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) (
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lastEvent xproto.MotionNotifyEvent,
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) {
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window.backend.connection.Sync()
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xevent.Read(window.backend.connection, false)
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lastEvent = firstEvent
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for index, untypedEvent := range xevent.Peek(window.backend.connection) {
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if untypedEvent.Err != nil { continue }
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typedEvent, ok := untypedEvent.Event.(xproto.MotionNotifyEvent)
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if !ok { continue }
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if firstEvent.Event == typedEvent.Event {
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lastEvent = typedEvent
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defer func (index int) {
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xevent.DequeueAt(window.backend.connection, index)
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} (index)
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}
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}
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return
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}
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