package cview import ( "sync" "github.com/gdamore/tcell/v2" ) // frameText holds information about a line of text shown in the frame. type frameText struct { Text string // The text to be displayed. Header bool // true = place in header, false = place in footer. Align int // One of the Align constants. Color tcell.Color // The text color. } // Frame is a wrapper which adds space around another primitive. In addition, // the top area (header) and the bottom area (footer) may also contain text. type Frame struct { *Box // The contained primitive. primitive Primitive // The lines of text to be displayed. text []*frameText // Border spacing. top, bottom, header, footer, left, right int sync.RWMutex } // NewFrame returns a new frame around the given primitive. The primitive's // size will be changed to fit within this frame. func NewFrame(primitive Primitive) *Frame { box := NewBox() f := &Frame{ Box: box, primitive: primitive, top: 1, bottom: 1, header: 1, footer: 1, left: 1, right: 1, } f.focus = f return f } // AddText adds text to the frame. Set "header" to true if the text is to appear // in the header, above the contained primitive. Set it to false for it to // appear in the footer, below the contained primitive. "align" must be one of // the Align constants. Rows in the header are printed top to bottom, rows in // the footer are printed bottom to top. Note that long text can overlap as // different alignments will be placed on the same row. func (f *Frame) AddText(text string, header bool, align int, color tcell.Color) { f.Lock() defer f.Unlock() f.text = append(f.text, &frameText{ Text: text, Header: header, Align: align, Color: color, }) } // Clear removes all text from the frame. func (f *Frame) Clear() { f.Lock() defer f.Unlock() f.text = nil } // SetBorders sets the width of the frame borders as well as "header" and // "footer", the vertical space between the header and footer text and the // contained primitive (does not apply if there is no text). func (f *Frame) SetBorders(top, bottom, header, footer, left, right int) { f.Lock() defer f.Unlock() f.top, f.bottom, f.header, f.footer, f.left, f.right = top, bottom, header, footer, left, right } // Draw draws this primitive onto the screen. func (f *Frame) Draw(screen tcell.Screen) { if !f.GetVisible() { return } f.Box.Draw(screen) f.Lock() defer f.Unlock() // Calculate start positions. x, top, width, height := f.GetInnerRect() bottom := top + height - 1 x += f.left top += f.top bottom -= f.bottom width -= f.left + f.right if width <= 0 || top >= bottom { return // No space left. } // Draw text. var rows [6]int // top-left, top-center, top-right, bottom-left, bottom-center, bottom-right. topMax := top bottomMin := bottom for _, text := range f.text { // Where do we place this text? var y int if text.Header { y = top + rows[text.Align] rows[text.Align]++ if y >= bottomMin { continue } if y+1 > topMax { topMax = y + 1 } } else { y = bottom - rows[3+text.Align] rows[3+text.Align]++ if y <= topMax { continue } if y-1 < bottomMin { bottomMin = y - 1 } } // Draw text. Print(screen, []byte(text.Text), x, y, width, text.Align, text.Color) } // Set the size of the contained primitive. if topMax > top { top = topMax + f.header } if bottomMin < bottom { bottom = bottomMin - f.footer } if top > bottom { return // No space for the primitive. } f.primitive.SetRect(x, top, width, bottom+1-top) // Finally, draw the contained primitive. f.primitive.Draw(screen) } // Focus is called when this primitive receives focus. func (f *Frame) Focus(delegate func(p Primitive)) { f.Lock() primitive := f.primitive defer f.Unlock() delegate(primitive) } // HasFocus returns whether or not this primitive has focus. func (f *Frame) HasFocus() bool { f.RLock() defer f.RUnlock() focusable, ok := f.primitive.(Focusable) if ok { return focusable.HasFocus() } return false } // MouseHandler returns the mouse handler for this primitive. func (f *Frame) MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) { return f.WrapMouseHandler(func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) { if !f.InRect(event.Position()) { return false, nil } // Pass mouse events on to contained primitive. return f.primitive.MouseHandler()(action, event, setFocus) }) }