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// 25 february 2014
package ui
import (
"sync"
)
// A ProgressBar is a horizontal rectangle that fills up from left to right to indicate the progress of a long-running task.
// This progress is represented by an integer within the range [0,100], representing a percentage.
// Alternatively, a progressbar can show an animation indicating that progress is being made but how much is indeterminate.
// Newly-created ProgressBars default to showing 0% progress.
type ProgressBar struct {
lock sync.Mutex
created bool
sysData *sysData
initProg int
}
// NewProgressBar creates a new ProgressBar.
func NewProgressBar() *ProgressBar {
return &ProgressBar{
sysData: mksysdata(c_progressbar),
}
}
// SetProgress sets the currently indicated progress amount on the ProgressBar.
// If percent is in the range [0,100], the progressBar shows that much percent complete.
// If percent is -1, the ProgressBar is made indeterminate.
// Otherwise, SetProgress panics.
// Calling SetProgress(-1) repeatedly will neither leave indeterminate mode nor stop any animation involved in indeterminate mode indefinitely; any other side-effect of doing so is implementation-defined.
func (p *ProgressBar) SetProgress(percent int) {
p.lock.Lock()
defer p.lock.Unlock()
if percent < -1 || percent > 100 {
panic("percent value out of range")
}
if p.created {
p.sysData.setProgress(percent)
return
}
p.initProg = percent
}
func (p *ProgressBar) make(window *sysData) error {
p.lock.Lock()
defer p.lock.Unlock()
err := p.sysData.make(window)
if err != nil {
return err
}
p.sysData.setProgress(p.initProg)
p.created = true
return nil
}
func (p *ProgressBar) allocate(x int, y int, width int, height int, d *sysSizeData) []*allocation {
return []*allocation{&allocation{
x: x,
y: y,
width: width,
height: height,
this: p,
}}
}
func (p *ProgressBar) preferredSize(d *sysSizeData) (width int, height int) {
return p.sysData.preferredSize(d)
}
func (p *ProgressBar) commitResize(a *allocation, d *sysSizeData) {
p.sysData.preferredSize(a, d)
}
func (p *ProgressBar) getAuxResizeInfo(d *sysSizeData) {
p.sysData.getAuxResizeInfo(d)
}
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