package ui import ( "fmt" "git.kirsle.net/apps/doodle/render" ) // DefaultFont is the default font settings used for a Label. var DefaultFont = render.Text{ Size: 12, Color: render.Black, } // Label is a simple text label widget. type Label struct { BaseWidget // Configurable fields for the constructor. Text string TextVariable *string Font render.Text width int32 height int32 } // NewLabel creates a new label. func NewLabel(c Label) *Label { w := &Label{ Text: c.Text, TextVariable: c.TextVariable, Font: DefaultFont, } if !c.Font.IsZero() { w.Font = c.Font } w.IDFunc(func() string { return fmt.Sprintf(`Label<"%s">`, w.text().Text) }) return w } // text returns the label's displayed text, coming from the TextVariable if // available or else the Text attribute instead. func (w *Label) text() render.Text { if w.TextVariable != nil { w.Font.Text = *w.TextVariable return w.Font } w.Font.Text = w.Text return w.Font } // Value returns the current text value displayed in the widget, whether it was // the hardcoded value or a TextVariable. func (w *Label) Value() string { return w.text().Text } // Compute the size of the label widget. func (w *Label) Compute(e render.Engine) { rect, err := e.ComputeTextRect(w.text()) if err != nil { log.Error("%s: failed to compute text rect: %s", w, err) return } if !w.FixedSize() { w.resizeAuto(render.Rect{ W: rect.W + (w.Font.Padding * 2), H: rect.H + (w.Font.Padding * 2), }) } w.MoveTo(render.Point{ X: rect.X + w.BoxThickness(1), Y: rect.Y + w.BoxThickness(1), }) } // Present the label widget. func (w *Label) Present(e render.Engine, P render.Point) { border := w.BoxThickness(1) w.DrawBox(e, P) e.DrawText(w.text(), render.Point{ X: P.X + border + w.Font.Padding, Y: P.Y + border + w.Font.Padding, }) }