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// 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 (
// Sizer is a shell widget that overrides its child's measured size.
type Sizer struct {
NaturalWidth unit.Value
NaturalHeight unit.Value
// NewSizer returns a new Sizer widget of the given natural size. Its parent
// widget may lay it out at a different size than its natural size, such as
// expanding to fill a panel's width.
func NewSizer(naturalWidth, naturalHeight unit.Value, inner node.Node) *Sizer {
w := &Sizer{
NaturalWidth: naturalWidth,
NaturalHeight: naturalHeight,
w.Wrapper = w
if inner != nil {
w.Insert(inner, nil)
return w
func (w *Sizer) Measure(t *theme.Theme, widthHint, heightHint int) {
w.MeasuredSize.X = t.Pixels(w.NaturalWidth).Round()
w.MeasuredSize.Y = t.Pixels(w.NaturalHeight).Round()
if c := w.FirstChild; c != nil {
c.Wrapper.Measure(t, w.MeasuredSize.X, w.MeasuredSize.Y)