1 files changed, 68 insertions, 0 deletions
diff --git a/prevlib/progressbar.go b/prevlib/progressbar.go
new file mode 100644
index 0000000..875a262
--- /dev/null
+++ b/prevlib/progressbar.go
@@ -0,0 +1,68 @@
+// 25 february 2014
+
+package ui
+
+// 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 {
+	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) {
+	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 {
+	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.commitResize(a, d)
+}
+
+func (p *ProgressBar) getAuxResizeInfo(d *sysSizeData) {
+	p.sysData.getAuxResizeInfo(d)
+}