66 lines
1.5 KiB
Go
66 lines
1.5 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 typically a percentage, so within the range [0,100].
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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. If this amount is outside the range [0,100] (ideally -1), the function will panic (it should allow indeterminate progress bars, alas those are not supported on Windows 2000).
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func (p *ProgressBar) SetProgress(percent int) {
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p.lock.Lock()
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defer p.lock.Unlock()
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if percent < 0 || percent > 100 {
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panic("invalid percent") // TODO
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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.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) error {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.sysData.setRect(x, y, width, height)
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}
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func (p *ProgressBar) preferredSize() (width int, height int, err error) {
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p.lock.Lock()
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defer p.lock.Unlock()
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width, height = p.sysData.preferredSize()
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return
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}
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