subsonic-tui/vendor/github.com/rivo/tview/modal.go

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package tview
import (
"github.com/gdamore/tcell/v2"
)
// Modal is a centered message window used to inform the user or prompt them
// for an immediate decision. It needs to have at least one button (added via
// [Modal.AddButtons]) or it will never disappear.
//
// See https://github.com/rivo/tview/wiki/Modal for an example.
type Modal struct {
*Box
// The frame embedded in the modal.
frame *Frame
// The form embedded in the modal's frame.
form *Form
// The message text (original, not word-wrapped).
text string
// The text color.
textColor tcell.Color
// The optional callback for when the user clicked one of the buttons. It
// receives the index of the clicked button and the button's label.
done func(buttonIndex int, buttonLabel string)
}
// NewModal returns a new modal message window.
func NewModal() *Modal {
m := &Modal{
Box: NewBox().SetBorder(true).SetBackgroundColor(Styles.ContrastBackgroundColor),
textColor: Styles.PrimaryTextColor,
}
m.form = NewForm().
SetButtonsAlign(AlignCenter).
SetButtonBackgroundColor(Styles.PrimitiveBackgroundColor).
SetButtonTextColor(Styles.PrimaryTextColor)
m.form.SetBackgroundColor(Styles.ContrastBackgroundColor).SetBorderPadding(0, 0, 0, 0)
m.form.SetCancelFunc(func() {
if m.done != nil {
m.done(-1, "")
}
})
m.frame = NewFrame(m.form).SetBorders(0, 0, 1, 0, 0, 0)
m.frame.SetBackgroundColor(Styles.ContrastBackgroundColor).
SetBorderPadding(1, 1, 1, 1)
return m
}
// SetBackgroundColor sets the color of the modal frame background.
func (m *Modal) SetBackgroundColor(color tcell.Color) *Modal {
m.form.SetBackgroundColor(color)
m.frame.SetBackgroundColor(color)
return m
}
// SetTextColor sets the color of the message text.
func (m *Modal) SetTextColor(color tcell.Color) *Modal {
m.textColor = color
return m
}
// SetButtonBackgroundColor sets the background color of the buttons.
func (m *Modal) SetButtonBackgroundColor(color tcell.Color) *Modal {
m.form.SetButtonBackgroundColor(color)
return m
}
// SetButtonTextColor sets the color of the button texts.
func (m *Modal) SetButtonTextColor(color tcell.Color) *Modal {
m.form.SetButtonTextColor(color)
return m
}
// SetButtonStyle sets the style of the buttons when they are not focused.
func (m *Modal) SetButtonStyle(style tcell.Style) *Modal {
m.form.SetButtonStyle(style)
return m
}
// SetButtonActivatedStyle sets the style of the buttons when they are focused.
func (m *Modal) SetButtonActivatedStyle(style tcell.Style) *Modal {
m.form.SetButtonActivatedStyle(style)
return m
}
// SetDoneFunc sets a handler which is called when one of the buttons was
// pressed. It receives the index of the button as well as its label text. The
// handler is also called when the user presses the Escape key. The index will
// then be negative and the label text an empty string.
func (m *Modal) SetDoneFunc(handler func(buttonIndex int, buttonLabel string)) *Modal {
m.done = handler
return m
}
// SetText sets the message text of the window. The text may contain line
// breaks but style tag states will not transfer to following lines. Note that
// words are wrapped, too, based on the final size of the window.
func (m *Modal) SetText(text string) *Modal {
m.text = text
return m
}
// AddButtons adds buttons to the window. There must be at least one button and
// a "done" handler so the window can be closed again.
func (m *Modal) AddButtons(labels []string) *Modal {
for index, label := range labels {
func(i int, l string) {
m.form.AddButton(label, func() {
if m.done != nil {
m.done(i, l)
}
})
button := m.form.GetButton(m.form.GetButtonCount() - 1)
button.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
switch event.Key() {
case tcell.KeyDown, tcell.KeyRight:
return tcell.NewEventKey(tcell.KeyTab, 0, tcell.ModNone)
case tcell.KeyUp, tcell.KeyLeft:
return tcell.NewEventKey(tcell.KeyBacktab, 0, tcell.ModNone)
}
return event
})
}(index, label)
}
return m
}
// ClearButtons removes all buttons from the window.
func (m *Modal) ClearButtons() *Modal {
m.form.ClearButtons()
return m
}
// SetFocus shifts the focus to the button with the given index.
func (m *Modal) SetFocus(index int) *Modal {
m.form.SetFocus(index)
return m
}
// Focus is called when this primitive receives focus.
func (m *Modal) Focus(delegate func(p Primitive)) {
delegate(m.form)
}
// HasFocus returns whether or not this primitive has focus.
func (m *Modal) HasFocus() bool {
return m.form.HasFocus()
}
// Draw draws this primitive onto the screen.
func (m *Modal) Draw(screen tcell.Screen) {
// Calculate the width of this modal.
buttonsWidth := 0
for _, button := range m.form.buttons {
buttonsWidth += TaggedStringWidth(button.text) + 4 + 2
}
buttonsWidth -= 2
screenWidth, screenHeight := screen.Size()
width := screenWidth / 3
if width < buttonsWidth {
width = buttonsWidth
}
// width is now without the box border.
// Reset the text and find out how wide it is.
m.frame.Clear()
lines := WordWrap(m.text, width)
for _, line := range lines {
m.frame.AddText(line, true, AlignCenter, m.textColor)
}
// Set the modal's position and size.
height := len(lines) + 6
width += 4
x := (screenWidth - width) / 2
y := (screenHeight - height) / 2
m.SetRect(x, y, width, height)
// Draw the frame.
m.Box.DrawForSubclass(screen, m)
x, y, width, height = m.GetInnerRect()
m.frame.SetRect(x, y, width, height)
m.frame.Draw(screen)
}
// MouseHandler returns the mouse handler for this primitive.
func (m *Modal) MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
return m.WrapMouseHandler(func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
// Pass mouse events on to the form.
consumed, capture = m.form.MouseHandler()(action, event, setFocus)
if !consumed && action == MouseLeftDown && m.InRect(event.Position()) {
setFocus(m)
consumed = true
}
return
})
}
// InputHandler returns the handler for this primitive.
func (m *Modal) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
return m.WrapInputHandler(func(event *tcell.EventKey, setFocus func(p Primitive)) {
if m.frame.HasFocus() {
if handler := m.frame.InputHandler(); handler != nil {
handler(event, setFocus)
return
}
}
})
}