98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
// 14 february 2014
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package ui
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import (
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"sync"
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)
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// A Label is a static line of text used to mark other controls.
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// Label text is drawn on a single line; text that does not fit is truncated.
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// A Label can appear in one of two places: bound to a control or standalone.
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// This determines the vertical alignment of the label.
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type Label struct {
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lock sync.Mutex
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created bool
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sysData *sysData
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initText string
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standalone bool
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}
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// NewLabel creates a new Label with the specified text.
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// The label is set to be bound to a control, so its vertical position depends on its vertical cell size in an implementation-defined manner.
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func NewLabel(text string) *Label {
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return &Label{
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sysData: mksysdata(c_label),
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initText: text,
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}
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}
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// NewStandaloneLabel creates a new Label with the specified text.
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// The label is set to be standalone, so its vertical position will always be at the top of the vertical space assigned to it.
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func NewStandaloneLabel(text string) *Label {
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return &Label{
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sysData: mksysdata(c_label),
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initText: text,
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standalone: true,
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}
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}
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// SetText sets the Label's text.
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func (l *Label) SetText(text string) {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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l.sysData.setText(text)
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return
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}
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l.initText = text
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}
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// Text returns the Label's text.
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func (l *Label) Text() string {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.text()
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}
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return l.initText
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}
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func (l *Label) make(window *sysData) error {
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l.lock.Lock()
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defer l.lock.Unlock()
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l.sysData.alternate = l.standalone
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err := l.sysData.make(window)
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if err != nil {
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return err
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}
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l.sysData.setText(l.initText)
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l.created = true
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return nil
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}
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func (l *Label) allocate(x int, y int, width int, height int, d *sysSizeData) []*allocation {
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return []*allocation{&allocation{
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x: x,
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y: y,
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width: width,
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height: height,
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this: l,
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}}
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}
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func (l *Label) preferredSize(d *sysSizeData) (width int, height int) {
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return l.sysData.preferredSize(d)
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}
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func (l *Label) commitResize(a *allocation, d *sysSizeData) {
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l.sysData.commitResize(a, d)
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}
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func (l *Label) getAuxResizeInfo(d *sysSizeData) {
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l.sysData.getAuxResizeInfo(d)
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}
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