| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package widget |
| |
| import ( |
| "image" |
| |
| "golang.org/x/image/font" |
| "golang.org/x/image/math/fixed" |
| ) |
| |
| // Label is a leaf widget that holds a text label. |
| type Label struct{ *Node } |
| |
| // NewLabel returns a new Label widget. |
| func NewLabel(text string) Label { |
| return Label{ |
| &Node{ |
| Class: &labelClass{ |
| text: text, |
| }, |
| }, |
| } |
| } |
| |
| func (o Label) Text() string { return o.Class.(*labelClass).text } |
| func (o Label) SetText(v string) { o.Class.(*labelClass).text = v } |
| |
| type labelClass struct { |
| LeafClassEmbed |
| text string |
| } |
| |
| func (k *labelClass) Measure(n *Node, t *Theme) { |
| f := t.AcquireFontFace(FontFaceOptions{}) |
| defer t.ReleaseFontFace(FontFaceOptions{}, f) |
| m := f.Metrics() |
| |
| n.MeasuredSize.X = font.MeasureString(f, k.text).Ceil() |
| n.MeasuredSize.Y = m.Ascent.Ceil() + m.Descent.Ceil() |
| } |
| |
| func (k *labelClass) Paint(n *Node, t *Theme, dst *image.RGBA, origin image.Point) { |
| f := t.AcquireFontFace(FontFaceOptions{}) |
| defer t.ReleaseFontFace(FontFaceOptions{}, f) |
| m := f.Metrics() |
| |
| d := font.Drawer{ |
| Dst: dst, |
| Src: t.GetPalette().Foreground, |
| Face: f, |
| Dot: fixed.Point26_6{ |
| X: fixed.I(origin.X + n.Rect.Min.X), |
| Y: fixed.I(origin.Y + n.Rect.Min.Y + m.Ascent.Ceil()), |
| }, |
| } |
| d.DrawString(k.text) |
| } |