package tview import ( "strings" "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 // 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(), 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.SetBorder(true). 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 } // 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 color 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() var lines []string for _, line := range strings.Split(m.text, "\n") { if len(line) == 0 { lines = append(lines, "") continue } lines = append(lines, WordWrap(line, width)...) } //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.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 } } }) }