rui_orig/checkbox.go

375 lines
9.7 KiB
Go

package rui
import (
"fmt"
"strings"
)
// CheckboxChangedEvent is the constant for "checkbox-event" property tag.
// The "checkbox-event" event occurs when the checkbox becomes checked/unchecked.
// The main listener format: func(Checkbox, bool), where the second argument is the checkbox state.
const CheckboxChangedEvent = "checkbox-event"
// Checkbox - checkbox view
type Checkbox interface {
ViewsContainer
}
type checkboxData struct {
viewsContainerData
checkedListeners []func(Checkbox, bool)
}
// NewCheckbox create new Checkbox object and return it
func NewCheckbox(session Session, params Params) Checkbox {
view := new(checkboxData)
view.Init(session)
setInitParams(view, Params{
ClickEvent: checkboxClickListener,
KeyDownEvent: checkboxKeyListener,
})
setInitParams(view, params)
return view
}
func newCheckbox(session Session) View {
return NewCheckbox(session, nil)
}
func (button *checkboxData) Init(session Session) {
button.viewsContainerData.Init(session)
button.tag = "Checkbox"
button.systemClass = "ruiGridLayout ruiCheckbox"
button.checkedListeners = []func(Checkbox, bool){}
}
func (button *checkboxData) Focusable() bool {
return true
}
func (button *checkboxData) Get(tag string) interface{} {
switch strings.ToLower(tag) {
case CheckboxChangedEvent:
return button.checkedListeners
}
return button.viewsContainerData.Get(tag)
}
func (button *checkboxData) Set(tag string, value interface{}) bool {
switch strings.ToLower(tag) {
case CheckboxChangedEvent:
ok := button.setChangedListener(value)
if !ok {
notCompatibleType(tag, value)
}
return ok
case Checked:
oldChecked := button.checked()
if !button.setBoolProperty(Checked, value) {
return false
}
if button.created {
checked := button.checked()
if checked != oldChecked {
button.changedCheckboxState(checked)
}
}
return true
case CheckboxHorizontalAlign, CheckboxVerticalAlign:
if button.setEnumProperty(tag, value, enumProperties[tag].values) {
if button.created {
htmlID := button.htmlID()
updateCSSStyle(htmlID, button.session)
updateInnerHTML(htmlID, button.session)
}
return true
}
return false
case VerticalAlign:
if button.setEnumProperty(tag, value, enumProperties[tag].values) {
if button.created {
updateCSSProperty(button.htmlID()+"content", "align-items", button.cssVerticalAlign(), button.session)
}
return true
}
return false
case HorizontalAlign:
if button.setEnumProperty(tag, value, enumProperties[tag].values) {
if button.created {
updateCSSProperty(button.htmlID()+"content", "justify-items", button.cssHorizontalAlign(), button.session)
}
return true
}
return false
case CellVerticalAlign, CellHorizontalAlign, CellWidth, CellHeight:
return false
}
return button.viewsContainerData.Set(tag, value)
}
func (button *checkboxData) Remove(tag string) {
switch strings.ToLower(tag) {
case CheckboxChangedEvent:
if len(button.checkedListeners) > 0 {
button.checkedListeners = []func(Checkbox, bool){}
}
case Checked:
oldChecked := button.checked()
delete(button.properties, tag)
if oldChecked {
button.changedCheckboxState(false)
}
case CheckboxHorizontalAlign, CheckboxVerticalAlign:
delete(button.properties, tag)
htmlID := button.htmlID()
updateCSSStyle(htmlID, button.session)
updateInnerHTML(htmlID, button.session)
case VerticalAlign:
delete(button.properties, tag)
updateCSSProperty(button.htmlID()+"content", "align-items", button.cssVerticalAlign(), button.session)
case HorizontalAlign:
delete(button.properties, tag)
updateCSSProperty(button.htmlID()+"content", "justify-items", button.cssHorizontalAlign(), button.session)
default:
button.viewsContainerData.Remove(tag)
}
}
func (button *checkboxData) checked() bool {
checked, _ := boolProperty(button, Checked, button.Session())
return checked
}
func (button *checkboxData) changedCheckboxState(state bool) {
for _, listener := range button.checkedListeners {
listener(button, state)
}
buffer := allocStringBuilder()
defer freeStringBuilder(buffer)
button.htmlCheckbox(buffer, state)
button.Session().runScript(fmt.Sprintf(`updateInnerHTML('%v', '%v');`, button.htmlID()+"checkbox", buffer.String()))
}
func checkboxClickListener(view View) {
view.Set(Checked, !IsCheckboxChecked(view, ""))
}
func checkboxKeyListener(view View, event KeyEvent) {
switch event.Code {
case "Enter", "Space":
view.Set(Checked, !IsCheckboxChecked(view, ""))
}
}
func (button *checkboxData) setChangedListener(value interface{}) bool {
if value == nil {
if len(button.checkedListeners) > 0 {
button.checkedListeners = []func(Checkbox, bool){}
}
return true
}
switch value := value.(type) {
case func(Checkbox, bool):
button.checkedListeners = []func(Checkbox, bool){value}
case func(bool):
fn := func(view Checkbox, checked bool) {
value(checked)
}
button.checkedListeners = []func(Checkbox, bool){fn}
case []func(Checkbox, bool):
button.checkedListeners = value
case []func(bool):
listeners := make([]func(Checkbox, bool), len(value))
for i, val := range value {
if val == nil {
return false
}
listeners[i] = func(view Checkbox, checked bool) {
val(checked)
}
}
button.checkedListeners = listeners
case []interface{}:
listeners := make([]func(Checkbox, bool), len(value))
for i, val := range value {
if val == nil {
return false
}
switch val := val.(type) {
case func(Checkbox, bool):
listeners[i] = val
case func(bool):
listeners[i] = func(view Checkbox, date bool) {
val(date)
}
default:
return false
}
}
button.checkedListeners = listeners
}
return true
}
func (button *checkboxData) cssStyle(self View, builder cssBuilder) {
session := button.Session()
vAlign, _ := enumStyledProperty(button, CheckboxVerticalAlign, LeftAlign)
hAlign, _ := enumStyledProperty(button, CheckboxHorizontalAlign, TopAlign)
switch hAlign {
case CenterAlign:
if vAlign == BottomAlign {
builder.add("grid-template-rows", "1fr auto")
} else {
builder.add("grid-template-rows", "auto 1fr")
}
case RightAlign:
builder.add("grid-template-columns", "1fr auto")
default:
builder.add("grid-template-columns", "auto 1fr")
}
if gap, ok := sizeConstant(session, "ruiCheckboxGap"); ok && gap.Type != Auto && gap.Value > 0 {
builder.add("gap", gap.cssString("0"))
}
builder.add("align-items", "stretch")
builder.add("justify-items", "stretch")
button.viewsContainerData.cssStyle(self, builder)
}
func (button *checkboxData) htmlCheckbox(buffer *strings.Builder, checked bool) (int, int) {
vAlign, _ := enumStyledProperty(button, CheckboxVerticalAlign, LeftAlign)
hAlign, _ := enumStyledProperty(button, CheckboxHorizontalAlign, TopAlign)
buffer.WriteString(`<div id="`)
buffer.WriteString(button.htmlID())
buffer.WriteString(`checkbox" style="display: grid;`)
if hAlign == CenterAlign {
buffer.WriteString(" justify-items: center; grid-column-start: 1; grid-column-end: 2;")
if vAlign == BottomAlign {
buffer.WriteString(" grid-row-start: 2; grid-row-end: 3;")
} else {
buffer.WriteString(" grid-row-start: 1; grid-row-end: 2;")
}
} else {
if hAlign == RightAlign {
buffer.WriteString(" grid-column-start: 2; grid-column-end: 3;")
} else {
buffer.WriteString(" grid-column-start: 1; grid-column-end: 2;")
}
buffer.WriteString(" grid-row-start: 1; grid-row-end: 2;")
switch vAlign {
case BottomAlign:
buffer.WriteString(" align-items: end;")
case CenterAlign:
buffer.WriteString(" align-items: center;")
default:
buffer.WriteString(" align-items: start;")
}
}
buffer.WriteString(`">`)
if checked {
buffer.WriteString(button.Session().checkboxOnImage())
} else {
buffer.WriteString(button.Session().checkboxOffImage())
}
buffer.WriteString(`</div>`)
return vAlign, hAlign
}
func (button *checkboxData) htmlSubviews(self View, buffer *strings.Builder) {
vCheckboxAlign, hCheckboxAlign := button.htmlCheckbox(buffer, IsCheckboxChecked(button, ""))
buffer.WriteString(`<div id="`)
buffer.WriteString(button.htmlID())
buffer.WriteString(`content" style="display: grid;`)
if hCheckboxAlign == LeftAlign {
buffer.WriteString(" grid-column-start: 2; grid-column-end: 3;")
} else {
buffer.WriteString(" grid-column-start: 1; grid-column-end: 2;")
}
if hCheckboxAlign == CenterAlign && vCheckboxAlign != BottomAlign {
buffer.WriteString(" grid-row-start: 2; grid-row-end: 3;")
} else {
buffer.WriteString(" grid-row-start: 1; grid-row-end: 2;")
}
buffer.WriteString(" align-items: ")
buffer.WriteString(button.cssVerticalAlign())
buffer.WriteRune(';')
buffer.WriteString(" justify-items: ")
buffer.WriteString(button.cssHorizontalAlign())
buffer.WriteRune(';')
buffer.WriteString(`">`)
button.viewsContainerData.htmlSubviews(self, buffer)
buffer.WriteString(`</div>`)
}
func (button *checkboxData) cssHorizontalAlign() string {
align, _ := enumStyledProperty(button, HorizontalAlign, TopAlign)
values := enumProperties[CellHorizontalAlign].cssValues
if align >= 0 && align < len(values) {
return values[align]
}
return values[0]
}
func (button *checkboxData) cssVerticalAlign() string {
align, _ := enumStyledProperty(button, VerticalAlign, TopAlign)
values := enumProperties[CellVerticalAlign].cssValues
if align >= 0 && align < len(values) {
return values[align]
}
return values[0]
}
// IsCheckboxChecked returns true if the Checkbox is checked, false otherwise.
// If the second argument (subviewID) is "" then a value from the first argument (view) is returned.
func IsCheckboxChecked(view View, subviewID string) bool {
if subviewID != "" {
view = ViewByID(view, subviewID)
}
if view != nil {
if checked := view.Get(Checked); checked != nil {
if b, ok := checked.(bool); ok {
return b
}
}
}
return false
}