Terminal-based user interface toolkit
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package tview
import (
"github.com/gdamore/tcell"
)
// Checkbox implements a simple box for boolean values which can be checked and
// unchecked.
//
// See https://github.com/rivo/tview/wiki/Checkbox for an example.
type Checkbox struct {
*Box
// Whether or not this box is checked.
checked bool
// The text to be displayed before the input area.
label string
// The label color.
labelColor tcell.Color
// The background color of the input area.
fieldBackgroundColor tcell.Color
// The text color of the input area.
fieldTextColor tcell.Color
// An optional function which is called when the user changes the checked
// state of this checkbox.
changed func(checked bool)
// An optional function which is called when the user indicated that they
// are done entering text. The key which was pressed is provided (tab,
// shift-tab, or escape).
done func(tcell.Key)
}
// NewCheckbox returns a new input field.
func NewCheckbox() *Checkbox {
return &Checkbox{
Box: NewBox(),
labelColor: Styles.SecondaryTextColor,
fieldBackgroundColor: Styles.ContrastBackgroundColor,
fieldTextColor: Styles.PrimaryTextColor,
}
}
// SetChecked sets the state of the checkbox.
func (c *Checkbox) SetChecked(checked bool) *Checkbox {
c.checked = checked
return c
}
// IsChecked returns whether or not the box is checked.
func (c *Checkbox) IsChecked() bool {
return c.checked
}
// SetLabel sets the text to be displayed before the input area.
func (c *Checkbox) SetLabel(label string) *Checkbox {
c.label = label
return c
}
// GetLabel returns the text to be displayed before the input area.
func (c *Checkbox) GetLabel() string {
return c.label
}
// SetLabelColor sets the color of the label.
func (c *Checkbox) SetLabelColor(color tcell.Color) *Checkbox {
c.labelColor = color
return c
}
// SetFieldBackgroundColor sets the background color of the input area.
func (c *Checkbox) SetFieldBackgroundColor(color tcell.Color) *Checkbox {
c.fieldBackgroundColor = color
return c
}
// SetFieldTextColor sets the text color of the input area.
func (c *Checkbox) SetFieldTextColor(color tcell.Color) *Checkbox {
c.fieldTextColor = color
return c
}
// SetFormAttributes sets attributes shared by all form items.
func (c *Checkbox) SetFormAttributes(label string, labelColor, bgColor, fieldTextColor, fieldBgColor tcell.Color) FormItem {
c.label = label
c.labelColor = labelColor
c.backgroundColor = bgColor
c.fieldTextColor = fieldTextColor
c.fieldBackgroundColor = fieldBgColor
return c
}
// GetFieldWidth returns this primitive's field width.
func (c *Checkbox) GetFieldWidth() int {
return 1
}
// SetChangedFunc sets a handler which is called when the checked state of this
// checkbox was changed by the user. The handler function receives the new
// state.
func (c *Checkbox) SetChangedFunc(handler func(checked bool)) *Checkbox {
c.changed = handler
return c
}
// SetDoneFunc sets a handler which is called when the user is done entering
// text. The callback function is provided with the key that was pressed, which
// is one of the following:
//
// - KeyEscape: Abort text input.
// - KeyTab: Move to the next field.
// - KeyBacktab: Move to the previous field.
func (c *Checkbox) SetDoneFunc(handler func(key tcell.Key)) *Checkbox {
c.done = handler
return c
}
// SetFinishedFunc calls SetDoneFunc().
func (c *Checkbox) SetFinishedFunc(handler func(key tcell.Key)) FormItem {
return c.SetDoneFunc(handler)
}
// Draw draws this primitive onto the screen.
func (c *Checkbox) Draw(screen tcell.Screen) {
c.Box.Draw(screen)
// Prepare
x, y, width, height := c.GetInnerRect()
rightLimit := x + width
if height < 1 || rightLimit <= x {
return
}
// Draw label.
_, drawnWidth := Print(screen, c.label, x, y, rightLimit-x, AlignLeft, c.labelColor)
x += drawnWidth
// Draw checkbox.
fieldStyle := tcell.StyleDefault.Background(c.fieldBackgroundColor).Foreground(c.fieldTextColor)
if c.focus.HasFocus() {
fieldStyle = fieldStyle.Background(c.fieldTextColor).Foreground(c.fieldBackgroundColor)
}
checkedRune := 'X'
if !c.checked {
checkedRune = ' '
}
screen.SetContent(x, y, checkedRune, nil, fieldStyle)
}
// InputHandler returns the handler for this primitive.
func (c *Checkbox) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
return c.wrapInputHandler(func(event *tcell.EventKey, setFocus func(p Primitive)) {
// Process key event.
switch key := event.Key(); key {
case tcell.KeyRune, tcell.KeyEnter: // Check.
if key == tcell.KeyRune && event.Rune() != ' ' {
break
}
c.checked = !c.checked
if c.changed != nil {
c.changed(c.checked)
}
case tcell.KeyTab, tcell.KeyBacktab, tcell.KeyEscape: // We're done.
if c.done != nil {
c.done(key)
}
}
})
}