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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.
package walk
type actionChangedHandler interface {
onActionChanged(action *Action) (err error)
}
var (
// ISSUE: When pressing enter resp. escape,
// WM_COMMAND with wParam=1 resp. 2 is sent.
// Maybe there is more to consider.
nextActionId uint16 = 3
actionsById map[uint16]*Action = make(map[uint16]*Action)
)
type Action struct {
menu *Menu
triggeredPublisher EventPublisher
changedHandlers []actionChangedHandler
text string
toolTip string
image *Bitmap
enabled bool
visible bool
checkable bool
checked bool
exclusive bool
id uint16
}
func NewAction() *Action {
a := &Action{
enabled: true,
id: nextActionId,
visible: true,
}
actionsById[a.id] = a
nextActionId++
return a
}
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 value != a.checked {
old := a.checked
a.checked = value
if err = a.raiseChanged(); err != nil {
a.checked = old
a.raiseChanged()
}
}
return
}
func (a *Action) Enabled() bool {
return a.enabled
}
func (a *Action) SetEnabled(value bool) (err error) {
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) 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() *Bitmap {
return a.image
}
func (a *Action) SetImage(value *Bitmap) (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) 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) 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
}
func (a *Action) Visible() bool {
return a.visible
}
func (a *Action) SetVisible(value bool) (err error) {
if value != a.visible {
old := a.visible
a.visible = value
if err = a.raiseChanged(); err != nil {
a.visible = old
a.raiseChanged()
}
}
return
}
func (a *Action) Triggered() *Event {
return a.triggeredPublisher.Event()
}
func (a *Action) raiseTriggered() {
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() (err error) {
for _, handler := range a.changedHandlers {
if err = handler.onActionChanged(a); err != nil {
return
}
}
return
}