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action.go
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action.go
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// Copyright 2010 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build windows
// +build windows
package walk
import (
"runtime"
"github.com/tailscale/walk/idalloc"
"github.com/tailscale/win"
)
type actionChangedHandler interface {
onActionChanged(action *Action) error
onActionVisibleChanged(action *Action) error
}
// ActionOwnerDrawHandler must be implemented by any struct that wants to
// provide measurement and drawing for owner-drawn menu items.
type ActionOwnerDrawHandler interface {
OnMeasure(action *Action, mctx *MenuItemMeasureContext) (widthPixels, heightPixels uint32)
OnDraw(action *Action, dctx *MenuItemDrawContext)
}
var (
actionIDs = makeIDAllocator()
actionsById = make(map[uint16]*Action)
shortcut2Action = make(map[Shortcut]*Action)
)
type Action struct {
menu *Menu
triggeredPublisher EventPublisher
changedHandlers []actionChangedHandler
text string
toolTip string
image Image
checkedCondition Condition
checkedConditionChangedHandle int
defaultCondition Condition
defaultConditionChangedHandle int
enabledCondition Condition
enabledConditionChangedHandle int
visibleCondition Condition
visibleConditionChangedHandle int
refCount int
shortcut Shortcut
enabled bool
visible bool
checkable bool
checked bool
defawlt bool
exclusive bool
id uint16
ownerDrawInfo *ownerDrawnMenuItemInfo
}
// aaron: I don't know why Walk uses menu item IDs for IDOK and IDCANCEL, but
// for now we need to reserve IDs up to and including IDCANCEL (2).
const maxReservedActionID = win.IDCANCEL
func makeIDAllocator() idalloc.IDAllocator {
alloc := idalloc.New(1 << 16)
for i := 0; i <= maxReservedActionID; i++ {
alloc.Allocate()
}
return alloc
}
func allocActionID() uint16 {
id, err := actionIDs.Allocate()
if err != nil {
panic(err)
}
return uint16(id)
}
func freeActionID(id uint16) {
if id <= maxReservedActionID {
return
}
actionIDs.Free(uint32(id))
}
func NewAction() *Action {
a := &Action{
enabled: true,
id: allocActionID(),
visible: true,
}
runtime.SetFinalizer(a, (*Action).finalize)
return a
}
func NewMenuAction(menu *Menu) *Action {
a := NewAction()
a.menu = menu
return a
}
func NewSeparatorAction() *Action {
a := &Action{
enabled: true,
visible: true,
}
runtime.SetFinalizer(a, (*Action).finalize)
return a
}
func (a *Action) Dispose() {
a.SetEnabledCondition(nil)
a.SetVisibleCondition(nil)
if a.menu != nil {
a.menu.actions.Clear()
a.menu.Dispose()
}
if a.ownerDrawInfo != nil {
a.ownerDrawInfo.Dispose()
a.ownerDrawInfo = nil
}
}
func (a *Action) finalize() {
if app := App(); !app.IsUIThread() {
app.Synchronize(a.finalize)
return
}
a.Dispose()
freeActionID(a.id)
}
func (a *Action) addRef() {
a.refCount++
if a.refCount == 1 && a.id > maxReservedActionID {
actionsById[a.id] = a
if sc := a.shortcut; sc.Key != 0 {
shortcut2Action[sc] = a
}
}
}
func (a *Action) release() {
a.refCount--
if a.refCount == 0 && a.id > maxReservedActionID {
delete(actionsById, a.id)
if sc := a.shortcut; sc.Key != 0 && shortcut2Action[sc] == a {
delete(shortcut2Action, sc)
}
}
}
func (a *Action) Menu() *Menu {
return a.menu
}
func (a *Action) Checkable() bool {
return a.checkable
}
func (a *Action) SetCheckable(value bool) (err error) {
if value != a.checkable {
old := a.checkable
a.checkable = value
if err = a.raiseChanged(); err != nil {
a.checkable = old
a.raiseChanged()
}
}
return
}
func (a *Action) Checked() bool {
return a.checked
}
func (a *Action) SetChecked(value bool) (err error) {
if a.checkedCondition != nil {
if bp, ok := a.checkedCondition.(*boolProperty); ok {
if err := bp.Set(value); err != nil {
return err
}
} else {
return newError("CheckedCondition != nil")
}
}
if value != a.checked {
old := a.checked
a.checked = value
if err = a.raiseChanged(); err != nil {
a.checked = old
a.raiseChanged()
}
}
return
}
func (a *Action) CheckedCondition() Condition {
return a.checkedCondition
}
func (a *Action) SetCheckedCondition(c Condition) {
if a.checkedCondition != nil {
a.checkedCondition.Changed().Detach(a.checkedConditionChangedHandle)
}
a.checkedCondition = c
if c != nil {
a.checked = c.Satisfied()
a.checkedConditionChangedHandle = c.Changed().Attach(func() {
if a.checked != c.Satisfied() {
a.checked = !a.checked
a.raiseChanged()
}
})
}
a.raiseChanged()
}
func (a *Action) Default() bool {
return a.defawlt
}
func (a *Action) SetDefault(value bool) (err error) {
if a.defaultCondition != nil {
if bp, ok := a.defaultCondition.(*boolProperty); ok {
if err := bp.Set(value); err != nil {
return err
}
} else {
return newError("DefaultCondition != nil")
}
}
if value != a.defawlt {
old := a.defawlt
a.defawlt = value
if err = a.raiseChanged(); err != nil {
a.defawlt = old
a.raiseChanged()
}
}
return
}
func (a *Action) DefaultCondition() Condition {
return a.defaultCondition
}
func (a *Action) SetDefaultCondition(c Condition) {
if a.defaultCondition != nil {
a.defaultCondition.Changed().Detach(a.defaultConditionChangedHandle)
}
a.defaultCondition = c
if c != nil {
a.defawlt = c.Satisfied()
a.defaultConditionChangedHandle = c.Changed().Attach(func() {
if a.defawlt != c.Satisfied() {
a.defawlt = !a.defawlt
a.raiseChanged()
}
})
}
a.raiseChanged()
}
func (a *Action) Enabled() bool {
return a.enabled
}
func (a *Action) SetEnabled(value bool) (err error) {
if a.enabledCondition != nil {
return newError("EnabledCondition != nil")
}
if value != a.enabled {
old := a.enabled
a.enabled = value
if err = a.raiseChanged(); err != nil {
a.enabled = old
a.raiseChanged()
}
}
return
}
func (a *Action) EnabledCondition() Condition {
return a.enabledCondition
}
func (a *Action) SetEnabledCondition(c Condition) {
prev := a.enabledCondition
if a.enabledCondition != nil {
a.enabledCondition.Changed().Detach(a.enabledConditionChangedHandle)
}
a.enabledCondition = c
if c != nil {
a.enabled = c.Satisfied()
a.enabledConditionChangedHandle = c.Changed().Attach(func() {
if a.enabled != c.Satisfied() {
a.enabled = !a.enabled
a.raiseChanged()
}
})
}
if prev != c {
a.raiseChanged()
}
}
func (a *Action) Exclusive() bool {
return a.exclusive
}
func (a *Action) SetExclusive(value bool) (err error) {
if value != a.exclusive {
old := a.exclusive
a.exclusive = value
if err = a.raiseChanged(); err != nil {
a.exclusive = old
a.raiseChanged()
}
}
return
}
func (a *Action) Image() Image {
return a.image
}
func (a *Action) SetImage(value Image) (err error) {
if value != a.image {
old := a.image
a.image = value
if err = a.raiseChanged(); err != nil {
a.image = old
a.raiseChanged()
}
}
return
}
func (a *Action) Shortcut() Shortcut {
return a.shortcut
}
func (a *Action) SetShortcut(shortcut Shortcut) (err error) {
if shortcut != a.shortcut {
old := a.shortcut
a.shortcut = shortcut
defer func() {
if err != nil {
a.shortcut = old
}
}()
if err := a.raiseChanged(); err != nil {
a.shortcut = old
a.raiseChanged()
return err
}
if a.refCount > 0 {
if shortcut2Action[old] == a {
delete(shortcut2Action, old)
}
if shortcut.Key != 0 {
shortcut2Action[shortcut] = a
}
}
}
return nil
}
func (a *Action) Text() string {
return a.text
}
func (a *Action) SetText(value string) (err error) {
if value != a.text {
old := a.text
a.text = value
if err = a.raiseChanged(); err != nil {
a.text = old
a.raiseChanged()
}
}
return
}
func (a *Action) IsSeparator() bool {
return a.id == 0 || a.text == "-"
}
func (a *Action) ToolTip() string {
return a.toolTip
}
func (a *Action) SetToolTip(value string) (err error) {
if value != a.toolTip {
old := a.toolTip
a.toolTip = value
if err = a.raiseChanged(); err != nil {
a.toolTip = old
a.raiseChanged()
}
}
return
}
// SetOwnerDraw converts a into an owner-drawn action whose measurement and
// drawing is carried out by handler.
func (a *Action) SetOwnerDraw(handler ActionOwnerDrawHandler) (err error) {
if a.ownerDrawInfo == nil && handler == nil {
// No change
return
}
if a.ownerDrawInfo != nil && a.ownerDrawInfo.handler == handler {
// No change
return
}
old := a.ownerDrawInfo
defer func() {
if old != nil {
old.Dispose()
}
}()
if handler != nil {
a.ownerDrawInfo = newOwnerDrawnMenuItemInfo(a, handler)
} else {
a.ownerDrawInfo = nil
}
if err = a.raiseChanged(); err != nil {
a.ownerDrawInfo, old = old, a.ownerDrawInfo
a.raiseChanged()
}
return
}
// OwnerDraw returns true when a has a handler registered for owner drawing.
func (a *Action) OwnerDraw() bool {
return a.ownerDrawInfo != nil
}
func (a *Action) Visible() bool {
return a.visible
}
func (a *Action) SetVisible(value bool) (err error) {
if a.visibleCondition != nil {
return newError("VisibleCondition != nil")
}
if value != a.visible {
old := a.visible
a.visible = value
if err = a.raiseVisibleChanged(); err != nil {
a.visible = old
a.raiseVisibleChanged()
}
}
return
}
func (a *Action) VisibleCondition() Condition {
return a.visibleCondition
}
func (a *Action) SetVisibleCondition(c Condition) {
prev := a.visibleCondition
if a.visibleCondition != nil {
a.visibleCondition.Changed().Detach(a.visibleConditionChangedHandle)
}
a.visibleCondition = c
if c != nil {
a.visible = c.Satisfied()
a.visibleConditionChangedHandle = c.Changed().Attach(func() {
if a.visible != c.Satisfied() {
a.visible = !a.visible
a.raiseVisibleChanged()
}
})
}
if prev != c {
a.raiseChanged()
}
}
func (a *Action) Triggered() *Event {
return a.triggeredPublisher.Event()
}
func (a *Action) raiseTriggered() {
if a.Checkable() {
a.SetChecked(a.Exclusive() || !a.Checked())
}
a.triggeredPublisher.Publish()
}
func (a *Action) addChangedHandler(handler actionChangedHandler) {
a.changedHandlers = append(a.changedHandlers, handler)
}
func (a *Action) removeChangedHandler(handler actionChangedHandler) {
for i, h := range a.changedHandlers {
if h == handler {
a.changedHandlers = append(a.changedHandlers[:i], a.changedHandlers[i+1:]...)
break
}
}
}
func (a *Action) raiseChanged() error {
for _, handler := range a.changedHandlers {
if err := handler.onActionChanged(a); err != nil {
return err
}
}
return nil
}
func (a *Action) raiseVisibleChanged() error {
for _, handler := range a.changedHandlers {
if err := handler.onActionVisibleChanged(a); err != nil {
return err
}
}
return nil
}