71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// 25 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 ProgressBar is a horizontal rectangle that fills up from left to right to indicate the progress of a long-running task.
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// This progress is represented by an integer within the range [0,100], representing a percentage.
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// Alternatively, a progressbar can show an animation indicating that progress is being made but how much is indeterminate.
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// Newly-created ProgressBars default to showing 0% progress.
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type ProgressBar struct {
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lock sync.Mutex
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created bool
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sysData *sysData
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initProg int
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}
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// NewProgressBar creates a new ProgressBar.
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func NewProgressBar() *ProgressBar {
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return &ProgressBar{
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sysData: mksysdata(c_progressbar),
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}
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}
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// SetProgress sets the currently indicated progress amount on the ProgressBar.
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// If percent is in the range [0,100], the progressBar shows that much percent complete.
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// If percent is -1, the ProgressBar is made indeterminate.
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// Otherwise, SetProgress panics.
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// TODO what happens if you repeatedly call SetProgress(-1)?
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func (p *ProgressBar) SetProgress(percent int) {
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if percent < -1 || percent > 100 {
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panic("percent value out of range")
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}
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if p.created {
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p.sysData.setProgress(percent)
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return
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}
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p.lock.Lock()
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defer p.lock.Unlock()
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p.initProg = percent
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}
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func (p *ProgressBar) make(window *sysData) error {
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p.lock.Lock()
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defer p.lock.Unlock()
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err := p.sysData.make("", window)
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if err != nil {
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return err
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}
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p.sysData.setProgress(p.initProg)
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p.created = true
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return nil
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}
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func (p *ProgressBar) setRect(x int, y int, width int, height int) []resizerequest {
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return []resizerequest{resizerequest{
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sysData: p.sysData,
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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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}}
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}
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func (p *ProgressBar) preferredSize() (width int, height int) {
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return p.sysData.preferredSize()
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}
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