/
eventmgr.go
1271 lines (1160 loc) · 34 KB
/
eventmgr.go
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// Copyright (c) 2018, Cogent Core. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gi
import (
"fmt"
"image"
"log"
"log/slog"
"path/filepath"
"strings"
"sync"
"time"
"cogentcore.org/core/abilities"
"cogentcore.org/core/cursors"
"cogentcore.org/core/events"
"cogentcore.org/core/events/key"
"cogentcore.org/core/goosi"
"cogentcore.org/core/grows/images"
"cogentcore.org/core/grr"
"cogentcore.org/core/keyfun"
"cogentcore.org/core/ki"
"cogentcore.org/core/mat32"
"cogentcore.org/core/states"
)
const (
DragSpriteName = "__DragSprite__"
)
// note: EventMgr should be in _exclusive_ control of its own state
// and IF we end up needing a mutex, it should be global on main
// entry points (HandleEvent, anything else?)
// EventMgr is an event manager that handles incoming events for a Scene.
// It creates all the derived event types (Hover, Sliding, Dragging)
// and Focus management for keyboard events.
type EventMgr struct {
// Scene is the scene that we manage events for
Scene *Scene
// mutex that protects timer variable updates (e.g., hover AfterFunc's)
TimerMu sync.Mutex
// stack of widgets with mouse pointer in BBox, and are not Disabled.
// Last item in the stack is the deepest nested widget (smallest BBox).
MouseInBBox []Widget
// stack of hovered widgets: have mouse pointer in BBox and have Hoverable flag
Hovers []Widget
// LastClickWidget is the last widget that has been clicked on
LastClickWidget Widget
// LastDoubleClickWidget is the last widget that has been clicked on
LastDoubleClickWidget Widget
// LastClickTime is the time the last widget was clicked on
LastClickTime time.Time
// the current candidate for a long hover event
LongHoverWidget Widget
// the position of the mouse at the start of LongHoverTimer
LongHoverPos image.Point
// the timer for the LongHover event, started with time.AfterFunc
LongHoverTimer *time.Timer
// the current candidate for a long press event
LongPressWidget Widget
// the position of the mouse at the start of LongPressTimer
LongPressPos image.Point
// the timer for the LongPress event, started with time.AfterFunc
LongPressTimer *time.Timer
// stack of drag-hovered widgets: have mouse pointer in BBox and have Droppable flag
DragHovers []Widget
// the deepest widget that was just pressed
Press Widget
// widget receiving mouse dragging events -- for drag-n-drop
Drag Widget
// the deepest draggable widget that was just pressed
DragPress Widget
// widget receiving mouse sliding events
Slide Widget
// the deepest slideable widget that was just pressed
SlidePress Widget
// widget receiving mouse scrolling events
Scroll Widget
// widget being held down with RepeatClickable ability
RepeatClick Widget
// the timer for RepeatClickable items
RepeatClickTimer *time.Timer
// widget receiving keyboard events -- use SetFocus, CurFocus
Focus Widget
// widget to focus on at start when no other focus has been set yet -- use SetStartFocus
StartFocus Widget
// if StartFocus not set, activate starting focus on first element
StartFocusFirst bool
// previously-focused widget -- what was in Focus when FocusClear is called
PrevFocus Widget
// Last Select Mode from most recent Mouse, Keyboard events
LastSelMode events.SelectModes
// Currently active shortcuts for this window (shortcuts are always window-wide.
// Use widget key event processing for more local key functions)
Shortcuts Shortcuts
// source data from DragStart event
DragData any
}
// MainStageMgr returns the MainStageMgr for our Main Stage
func (em *EventMgr) MainStageMgr() *StageMgr {
if em.Scene == nil {
return nil
}
return em.Scene.MainStageMgr()
}
// RenderWin returns the overall render window, which could be nil
func (em *EventMgr) RenderWin() *RenderWin {
mgr := em.MainStageMgr()
if mgr == nil {
return nil
}
return mgr.RenderWin
}
///////////////////////////////////////////////////////////////////////
// HandleEvent
func (em *EventMgr) HandleEvent(e events.Event) {
// et := evi.Type()
// fmt.Printf("got event type: %v: %v\n", et, evi)
if e.IsHandled() {
return
}
switch {
case e.HasPos():
em.HandlePosEvent(e)
case e.NeedsFocus():
em.HandleFocusEvent(e)
default:
em.HandleOtherEvent(e)
}
}
func (em *EventMgr) HandleOtherEvent(e events.Event) {
fmt.Println("TODO: Other event not handled", e)
}
func (em *EventMgr) HandleFocusEvent(e events.Event) {
// key down and key up can not give active focus, only key chord
if em.Focus == nil && e.Type() != events.KeyDown && e.Type() != events.KeyUp {
switch {
case em.StartFocus != nil:
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "StartFocus:", em.StartFocus)
}
em.SetFocusEvent(em.StartFocus)
case em.PrevFocus != nil:
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "PrevFocus:", em.PrevFocus)
}
em.SetFocusEvent(em.PrevFocus)
em.PrevFocus = nil
}
}
if em.Focus != nil {
em.Focus.WalkUpParent(func(k ki.Ki) bool {
_, wb := AsWidget(k)
if !wb.IsVisible() {
return ki.Break
}
wb.FirstHandleEvent(e)
return !e.IsHandled()
})
if !e.IsHandled() {
em.Focus.HandleEvent(e)
}
if !e.IsHandled() {
em.Focus.WalkUpParent(func(k ki.Ki) bool {
_, wb := AsWidget(k)
if !wb.IsVisible() {
return ki.Break
}
wb.FinalHandleEvent(e)
return !e.IsHandled()
})
}
}
em.ManagerKeyChordEvents(e)
}
func (em *EventMgr) ResetOnMouseDown() {
em.Press = nil
em.Drag = nil
em.DragPress = nil
em.Slide = nil
em.SlidePress = nil
em.CancelRepeatClick()
// if we have sent a long hover start event, we send an end
// event (non-nil widget plus nil timer means we already sent)
if em.LongHoverWidget != nil && em.LongHoverTimer == nil {
em.LongHoverWidget.Send(events.LongHoverEnd)
}
em.LongHoverWidget = nil
em.LongHoverPos = image.Point{}
if em.LongHoverTimer != nil {
em.LongHoverTimer.Stop()
em.LongHoverTimer = nil
}
}
func (em *EventMgr) HandlePosEvent(e events.Event) {
pos := e.Pos()
et := e.Type()
sc := em.Scene
switch et {
case events.MouseDown:
em.ResetOnMouseDown()
case events.MouseDrag:
if em.Slide != nil {
em.Slide.HandleEvent(e)
em.Slide.Send(events.SlideMove, e)
return
}
case events.Scroll:
if em.Scroll != nil {
em.Scroll.HandleEvent(e)
return
}
}
em.MouseInBBox = nil
em.GetMouseInBBox(sc, pos)
n := len(em.MouseInBBox)
if n == 0 {
if DebugSettings.EventTrace && et != events.MouseMove {
log.Println("Nothing in bbox:", sc.Geom.TotalBBox, "pos:", pos)
}
return
}
var press, dragPress, slidePress, move, up, repeatClick Widget
for i := n - 1; i >= 0; i-- {
w := em.MouseInBBox[i]
wb := w.AsWidget()
// we need to handle this here and not in [EventMgr.GetMouseInBBox] so that
// we correctly process cursors for disabled elements.
// in ScRenderBBoxes, everyone is effectively enabled
if wb.StateIs(states.Disabled) && !sc.Is(ScRenderBBoxes) {
continue
}
w.HandleEvent(e) // everyone gets the primary event who is in scope, deepest first
switch et {
case events.MouseMove:
if move == nil && wb.Styles.Abilities.IsHoverable() {
move = w
}
case events.MouseDown:
// in ScRenderBBoxes, everyone is effectively pressable
if press == nil && (wb.Styles.Abilities.IsPressable() || sc.Is(ScRenderBBoxes)) {
press = w
}
if dragPress == nil && wb.Styles.Abilities.Is(abilities.Draggable) {
dragPress = w
}
if slidePress == nil && wb.Styles.Abilities.Is(abilities.Slideable) {
slidePress = w
}
if repeatClick == nil && wb.Styles.Abilities.Is(abilities.RepeatClickable) {
repeatClick = w
}
case events.MouseUp:
// in ScRenderBBoxes, everyone is effectively pressable
if up == nil && (wb.Styles.Abilities.IsPressable() || sc.Is(ScRenderBBoxes)) {
up = w
}
}
}
switch et {
case events.MouseDown:
if press != nil {
em.Press = press
}
if dragPress != nil {
em.DragPress = dragPress
}
if slidePress != nil {
em.SlidePress = slidePress
}
if repeatClick != nil {
em.RepeatClick = repeatClick
em.StartRepeatClickTimer()
}
em.HandleLongPress(e)
case events.MouseMove:
hovs := make([]Widget, 0, len(em.MouseInBBox))
for _, w := range em.MouseInBBox { // requires forward iter through em.MouseInBBox
wb := w.AsWidget()
// in ScRenderBBoxes, everyone is effectively hoverable
if wb.Styles.Abilities.IsHoverable() || sc.Is(ScRenderBBoxes) {
hovs = append(hovs, w)
}
}
if sc.Is(ScRenderBBoxes) {
pselw := sc.SelectedWidget
if len(em.Hovers) > 0 {
sc.SelectedWidget = em.Hovers[len(em.Hovers)-1]
} else {
sc.SelectedWidget = nil
}
if sc.SelectedWidget != pselw {
if pselw != nil {
pselw.AsWidget().NeedsRender()
}
if sc.SelectedWidget != nil {
sc.SelectedWidget.AsWidget().NeedsRender()
}
}
}
em.Hovers = em.UpdateHovers(hovs, em.Hovers, e, events.MouseEnter, events.MouseLeave)
em.HandleLongHover(e)
case events.MouseDrag:
if em.Drag != nil {
hovs := make([]Widget, 0, len(em.MouseInBBox))
for _, w := range em.MouseInBBox { // requires forward iter through em.MouseInBBox
wb := w.AsWidget()
if wb.AbilityIs(abilities.Droppable) {
hovs = append(hovs, w)
}
}
em.DragHovers = em.UpdateHovers(hovs, em.DragHovers, e, events.DragEnter, events.DragLeave)
em.DragMove(e) // updates sprite position
em.Drag.HandleEvent(e) // raw drag
em.Drag.Send(events.DragMove, e) // usually ignored
} else {
if em.DragPress != nil && em.DragStartCheck(e, DeviceSettings.DragStartTime, DeviceSettings.DragStartDistance) {
em.CancelRepeatClick()
em.CancelLongPress()
em.DragPress.Send(events.DragStart, e)
} else if em.SlidePress != nil && em.DragStartCheck(e, DeviceSettings.SlideStartTime, DeviceSettings.DragStartDistance) {
em.CancelRepeatClick()
em.CancelLongPress()
em.Slide = em.SlidePress
em.Slide.Send(events.SlideStart, e)
}
}
// if we already have a long press widget, we update it based on our dragging movement
if em.LongPressWidget != nil {
em.HandleLongPress(e)
}
case events.MouseUp:
em.CancelRepeatClick()
if em.Slide != nil {
em.Slide.Send(events.SlideStop, e)
em.Slide = nil
em.Press = nil
}
if em.Drag != nil {
em.DragDrop(em.Drag, e)
em.Press = nil
}
// if we have sent a long press start event, we don't send click
// events (non-nil widget plus nil timer means we already sent)
if em.Press == up && up != nil && !(em.LongPressWidget != nil && em.LongPressTimer == nil) {
em.CancelLongPress()
switch e.MouseButton() {
case events.Left:
if sc.SelectedWidgetChan != nil {
sc.SelectedWidgetChan <- up
return
}
dcInTime := time.Since(em.LastClickTime) < DeviceSettings.DoubleClickInterval
em.LastClickTime = time.Now()
sentMulti := false
switch {
case em.LastDoubleClickWidget == up && dcInTime:
tce := e.NewFromClone(events.TripleClick)
for i := n - 1; i >= 0; i-- {
w := em.MouseInBBox[i]
wb := w.AsWidget()
if !wb.StateIs(states.Disabled) && wb.AbilityIs(abilities.TripleClickable) {
sentMulti = true
w.HandleEvent(tce)
break
}
}
case em.LastClickWidget == up && dcInTime:
dce := e.NewFromClone(events.DoubleClick)
for i := n - 1; i >= 0; i-- {
w := em.MouseInBBox[i]
wb := w.AsWidget()
if !wb.StateIs(states.Disabled) && wb.AbilityIs(abilities.DoubleClickable) {
em.LastDoubleClickWidget = up // not actually who gets the event
sentMulti = true
w.HandleEvent(dce)
break
}
}
}
if !sentMulti {
em.LastDoubleClickWidget = nil
em.LastClickWidget = up
up.Send(events.Click, e)
}
case events.Right: // note: automatically gets Control+Left
up.Send(events.ContextMenu, e)
}
}
// if our original pressed widget is different from the one we are
// going up on, then it has not gotten a mouse up event yet, so
// we need to send it one
if em.Press != up && em.Press != nil {
em.Press.HandleEvent(e)
}
em.Press = nil
// if we have sent a long press start event, we send an end
// event (non-nil widget plus nil timer means we already sent)
if em.LongPressWidget != nil && em.LongPressTimer == nil {
em.LongPressWidget.Send(events.LongPressEnd, e)
}
em.CancelLongPress()
// a mouse up event acts also acts as a mouse leave
// event on mobile, as that is needed to clear any
// hovered state
if up != nil && TheApp.Platform().IsMobile() {
up.Send(events.MouseLeave, e)
}
case events.Scroll:
switch {
case em.Slide != nil:
em.Slide.HandleEvent(e)
case em.Drag != nil:
em.Drag.HandleEvent(e)
case em.Press != nil:
em.Press.HandleEvent(e)
default:
em.Scene.HandleEvent(e)
}
}
// we need to handle cursor after all of the events so that
// we get the latest cursor if it changes based on the state
cursorSet := false
for i := n - 1; i >= 0; i-- {
w := em.MouseInBBox[i]
wb := w.AsWidget()
if !cursorSet && wb.Styles.Cursor != cursors.None {
em.SetCursor(wb.Styles.Cursor)
cursorSet = true
}
}
}
// UpdateHovers updates the hovered widgets based on current
// widgets in bounding box.
func (em *EventMgr) UpdateHovers(hov, prev []Widget, e events.Event, enter, leave events.Types) []Widget {
for _, prv := range prev {
stillIn := false
for _, cur := range hov {
if prv == cur {
stillIn = true
break
}
}
if !stillIn && prv.This() != nil {
prv.Send(leave, e)
}
}
for _, cur := range hov {
wasIn := false
for _, prv := range prev {
if prv == cur {
wasIn = true
break
}
}
if !wasIn {
cur.Send(enter, e)
}
}
// todo: detect change in top one, use to update cursor
return hov
}
// TopLongHover returns the top-most LongHoverable widget among the Hovers
func (em *EventMgr) TopLongHover() Widget {
var deep Widget
for i := len(em.Hovers) - 1; i >= 0; i-- {
h := em.Hovers[i]
if h.AbilityIs(abilities.LongHoverable) {
deep = h
break
}
}
return deep
}
// HandleLongHover handles long hover events
func (em *EventMgr) HandleLongHover(e events.Event) {
em.HandleLong(e, em.TopLongHover(), &em.LongHoverWidget, &em.LongHoverPos, &em.LongHoverTimer, events.LongHoverStart, events.LongHoverEnd, DeviceSettings.LongHoverTime, DeviceSettings.LongHoverStopDistance)
}
// HandleLongPress handles long press events
func (em *EventMgr) HandleLongPress(e events.Event) {
em.HandleLong(e, em.Press, &em.LongPressWidget, &em.LongPressPos, &em.LongPressTimer, events.LongPressStart, events.LongPressEnd, DeviceSettings.LongPressTime, DeviceSettings.LongPressStopDistance)
}
// HandleLong is the implementation of [EventMgr.HandleLongHover] and
// [EventManger.HandleLongPress]. It handles the logic to do with tracking
// long events using the given pointers to event manager fields and
// constant type, time, and distance properties. It should not need to
// be called by anything except for the aforementioned functions.
func (em *EventMgr) HandleLong(e events.Event, deep Widget, w *Widget, pos *image.Point, t **time.Timer, styp, etyp events.Types, stime time.Duration, sdist int) {
em.TimerMu.Lock()
defer em.TimerMu.Unlock()
// fmt.Println("em:", em.Scene.Name())
clearLong := func() {
if *t != nil {
(*t).Stop() // TODO: do we need to close this?
*t = nil
}
*w = nil
*pos = image.Point{}
// fmt.Println("cleared hover")
}
cpos := e.WindowPos()
dst := int(mat32.Hypot(float32(pos.X-cpos.X), float32(pos.Y-cpos.Y)))
// fmt.Println("dist:", dst)
// we have no long hovers, so we must be done
if deep == nil {
// fmt.Println("no deep")
if *w == nil {
// fmt.Println("no lhw")
return
}
// if we have already finished the timer, then we have already
// sent the start event, so we have to send the end one
if *t == nil {
(*w).Send(etyp, e)
}
clearLong()
// fmt.Println("cleared")
return
}
// we still have the current one, so there is nothing to do
// but make sure our position hasn't changed too much
if deep == *w {
// if we haven't gone too far, we have nothing to do
if dst <= sdist {
// fmt.Println("bail on dist:", dst)
return
}
// If we have gone too far, we are done with the long hover and
// we must clear it. However, critically, we do not return, as
// we must make a new tooltip immediately; otherwise, we may end
// up not getting another mouse move event, so we will be on the
// element with no tooltip, which is a bug. Not returning here is
// the solution to https://github.com/cogentcore/core/issues/553
(*w).Send(etyp, e)
clearLong()
// fmt.Println("fallthrough after clear")
}
// if we have changed and still have the timer, we never
// sent a start event, so we just bail
if *t != nil {
clearLong()
// fmt.Println("timer non-nil, cleared")
return
}
// we now know we don't have the timer and thus sent the start
// event already, so we need to send a end event
if *w != nil {
(*w).Send(etyp, e)
clearLong()
// fmt.Println("lhw, send end, cleared")
return
}
// now we can set it to our new widget
*w = deep
// fmt.Println("setting new:", deep)
*pos = e.WindowPos()
*t = time.AfterFunc(stime, func() {
win := em.RenderWin()
if win == nil {
return
}
rc := win.RenderContext() // have to get this one first
rc.Lock()
defer rc.Unlock()
em.TimerMu.Lock() // then can get this
defer em.TimerMu.Unlock()
if *w == nil {
return
}
(*w).Send(styp, e)
// we are done with the timer, and this indicates that
// we have sent a start event
*t = nil
})
}
func (em *EventMgr) GetMouseInBBox(w Widget, pos image.Point) {
wb := w.AsWidget()
wb.WidgetWalkPre(func(kwi Widget, kwb *WidgetBase) bool {
// we do not handle disabled here so that
// we correctly process cursors for disabled elements.
// it needs to be handled downstream by anyone who needs it.
if !kwb.IsVisible() {
return ki.Break
}
if !kwb.PosInScBBox(pos) {
return ki.Break
}
// fmt.Println("in bb:", kwi, kwb.Styles.State)
em.MouseInBBox = append(em.MouseInBBox, kwi)
if kwb.Parts != nil {
em.GetMouseInBBox(kwb.Parts, pos)
}
if ly := AsLayout(kwi); ly != nil {
for d := mat32.X; d <= mat32.Y; d++ {
if ly.HasScroll[d] {
sb := ly.Scrolls[d]
em.GetMouseInBBox(sb, pos)
}
}
}
return ki.Continue
})
}
func (em *EventMgr) CancelLongPress() {
em.LongPressWidget = nil
em.LongPressPos = image.Point{}
if em.LongPressTimer != nil {
em.LongPressTimer.Stop()
em.LongPressTimer = nil
}
}
func (em *EventMgr) CancelRepeatClick() {
em.RepeatClick = nil
if em.RepeatClickTimer != nil {
em.RepeatClickTimer.Stop()
em.RepeatClickTimer = nil
}
}
func (em *EventMgr) StartRepeatClickTimer() {
if em.RepeatClick == nil || !em.RepeatClick.IsVisible() {
return
}
delay := DeviceSettings.RepeatClickTime
if em.RepeatClickTimer == nil {
delay *= 8
}
em.RepeatClickTimer = time.AfterFunc(delay, func() {
if em.RepeatClick == nil || !em.RepeatClick.IsVisible() {
return
}
em.RepeatClick.Send(events.Click)
em.StartRepeatClickTimer()
})
}
func (em *EventMgr) DragStartCheck(e events.Event, dur time.Duration, dist int) bool {
since := e.SinceStart()
if since < dur {
return false
}
dst := int(mat32.V2FromPoint(e.StartDelta()).Length())
return dst >= dist
}
// DragStart starts a drag event, capturing a sprite image of the given widget
// and storing the data for later use during Drop.
// A drag does not officially start until this is called.
func (em *EventMgr) DragStart(w Widget, data any, e events.Event) {
ms := em.Scene.Stage.Main
if ms == nil {
return
}
em.Drag = w
em.DragData = data
sp := NewSprite(DragSpriteName, image.Point{}, e.WindowPos())
sp.GrabRenderFrom(w) // todo: show number of items?
ImageClearer(sp.Pixels, 50.0)
sp.On = true
ms.Sprites.Add(sp)
}
// DragMove is generally handled entirely by the event manager
func (em *EventMgr) DragMove(e events.Event) {
ms := em.Scene.Stage.Main
if ms == nil {
return
}
sp, ok := ms.Sprites.SpriteByName(DragSpriteName)
if !ok {
fmt.Println("Drag sprite not found")
return
}
sp.Geom.Pos = e.WindowPos()
em.Scene.NeedsRender()
}
func (em *EventMgr) DragClearSprite() {
ms := em.Scene.Stage.Main
if ms == nil {
return
}
ms.Sprites.InactivateSprite(DragSpriteName)
}
func (em *EventMgr) DragMenuAddModLabel(m *Scene, mod events.DropMods) {
switch mod {
case events.DropCopy:
NewLabel(m).SetText("Copy (Use Shift to Move):")
case events.DropMove:
NewLabel(m).SetText("Move:")
}
}
// DragDrop sends the events.Drop event to the top of the DragHovers stack.
// clearing the current dragging sprite before doing anything.
// It is up to the target to call
func (em *EventMgr) DragDrop(drag Widget, e events.Event) {
em.DragClearSprite()
data := em.DragData
em.Drag = nil
if len(em.DragHovers) == 0 {
if DebugSettings.EventTrace {
fmt.Println(drag, "Drop has no target")
}
return
}
for _, dwi := range em.DragHovers {
dwi.SetState(false, states.DragHovered)
}
targ := em.DragHovers[len(em.DragHovers)-1]
de := events.NewDragDrop(events.Drop, e.(*events.Mouse)) // gets the actual mod at this point
de.Data = data
de.Source = drag
de.Target = targ
if DebugSettings.EventTrace {
fmt.Println(targ, "Drop with mod:", de.DropMod, "source:", de.Source)
}
targ.HandleEvent(de)
}
// DropFinalize should be called as the last step in the Drop event processing,
// to send the DropDeleteSource event to the source in case of DropMod == DropMove.
// Otherwise, nothing actually happens.
func (em *EventMgr) DropFinalize(de *events.DragDrop) {
if de.DropMod != events.DropMove {
return
}
de.Typ = events.DropDeleteSource
de.ClearHandled()
de.Source.(Widget).HandleEvent(de)
}
///////////////////////////////////////////////////////////////////
// Key events
// SendKeyChordEvent sends a KeyChord event with given values. If popup is
// true, then only items on popup are in scope, otherwise items NOT on popup
// are in scope (if no popup, everything is in scope).
// func (em *EventMgr) SendKeyChordEvent(popup bool, r rune, mods ...key.Modifiers) {
// ke := key.NewEvent(r, 0, key.Press, 0)
// ke.SetTime()
// // ke.SetModifiers(mods...)
// // em.HandleEvent(ke)
// }
// Sendkeyfun.Event sends a KeyChord event with params from the given keyfun..
// If popup is true, then only items on popup are in scope, otherwise items
// NOT on popup are in scope (if no popup, everything is in scope).
// func (em *EventMgr) Sendkeyfun.Event(kf keyfun.Funs, popup bool) {
// chord := ActiveKeyMap.ChordFor(kf)
// if chord == "" {
// return
// }
// r, code, mods, err := chord.Decode()
// if err != nil {
// return
// }
// ke := key.NewEvent(r, 0, key.Press, mods)
// ke.SetTime()
// // em.HandleEvent(&ke)
// }
// Clipboard returns the goosi goosi.Clipboard, supplying the window context
// if available.
func (em *EventMgr) Clipboard() goosi.Clipboard {
var gwin goosi.Window
if win := em.RenderWin(); win != nil {
gwin = win.GoosiWin
}
return goosi.TheApp.Clipboard(gwin)
}
// SetCursor sets window cursor to given Cursor
func (em *EventMgr) SetCursor(cur cursors.Cursor) {
win := em.RenderWin()
if win == nil {
return
}
if !win.IsVisible() {
return
}
grr.Log(goosi.TheApp.Cursor(win.GoosiWin).Set(cur))
}
// FocusClear saves current focus to FocusPrev
func (em *EventMgr) FocusClear() bool {
if em.Focus != nil {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "FocusClear:", em.Focus)
}
em.PrevFocus = em.Focus
}
return em.SetFocusEvent(nil)
}
// SetFocus sets focus to given item, and returns true if focus changed.
// If item is nil, then nothing has focus.
// This does NOT send the events.Focus event to the widget.
// See [SetFocusEvent] for version that does send event.
func (em *EventMgr) SetFocus(w Widget) bool {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "SetFocus:", w)
}
got := em.SetFocusImpl(w, false) // no event
if !got {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "SetFocus: Failed", w)
}
return false
}
if w != nil {
w.AsWidget().ScrollToMe()
}
return got
}
// SetFocusEvent sets focus to given item, and returns true if focus changed.
// If item is nil, then nothing has focus.
// This sends the [events.Focus] event to the widget.
// See [SetFocus] for a version that does not.
func (em *EventMgr) SetFocusEvent(w Widget) bool {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "SetFocusEvent:", w)
}
got := em.SetFocusImpl(w, true) // sends event
if !got {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "SetFocusEvent: Failed", w)
}
return false
}
if w != nil {
w.AsWidget().ScrollToMe()
}
return got
}
// SetFocusImpl sets focus to given item -- returns true if focus changed.
// If item is nil, then nothing has focus.
// sendEvent determines whether the events.Focus event is sent to the focused item.
func (em *EventMgr) SetFocusImpl(w Widget, sendEvent bool) bool {
cfoc := em.Focus
if cfoc == nil || cfoc.This() == nil {
em.Focus = nil
// fmt.Println("nil foc impl")
cfoc = nil
}
if cfoc != nil && w != nil && cfoc.This() == w.This() {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "Already Focus:", cfoc)
}
// if sendEvent { // still send event
// w.Send(events.Focus)
// }
return false
}
if cfoc != nil {
if DebugSettings.FocusTrace {
fmt.Println(em.Scene, "Losing focus:", cfoc)
}
cfoc.Send(events.FocusLost)
}
em.Focus = w
if sendEvent && w != nil {
w.Send(events.Focus)
}
return true
}
// FocusNext sets the focus on the next item
// that can accept focus after the current Focus item.
// returns true if a focus item found.
func (em *EventMgr) FocusNext() bool {
if em.Focus == nil {
return em.FocusFirst()
}
return em.FocusNextFrom(em.Focus)
}
// FocusNextFrom sets the focus on the next item
// that can accept focus after the given item.
// returns true if a focus item found.
func (em *EventMgr) FocusNextFrom(from Widget) bool {
next := WidgetNextFunc(from, func(w Widget) bool {
return w.IsVisible() && !w.StateIs(states.Disabled) && w.AbilityIs(abilities.Focusable)
})
em.SetFocusEvent(next)
return next != nil
}
// FocusOnOrNext sets the focus on the given item, or the next one that can
// accept focus -- returns true if a new focus item found.
func (em *EventMgr) FocusOnOrNext(foc Widget) bool {
cfoc := em.Focus
if cfoc == foc {
return true
}
_, wb := AsWidget(foc)
if !wb.IsVisible() {
return false
}
if wb.AbilityIs(abilities.Focusable) {
em.SetFocusEvent(foc)
return true
}
return em.FocusNextFrom(foc)
}
// FocusOnOrPrev sets the focus on the given item, or the previous one that can
// accept focus -- returns true if a new focus item found.
func (em *EventMgr) FocusOnOrPrev(foc Widget) bool {
cfoc := em.Focus
if cfoc == foc {
return true
}
_, wb := AsWidget(foc)
if !wb.IsVisible() {
return false
}
if wb.AbilityIs(abilities.Focusable) {
em.SetFocusEvent(foc)
return true
}
return em.FocusPrevFrom(foc)
}
// FocusPrev sets the focus on the previous item before the
// current focus item.
func (em *EventMgr) FocusPrev() bool {