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