1 files changed, 52 insertions, 0 deletions
diff --git a/prev/progressbar_windows.go b/prev/progressbar_windows.go
new file mode 100644
index 0000000..807b0c1
--- /dev/null
+++ b/prev/progressbar_windows.go
@@ -0,0 +1,52 @@
+// 4 november 2014
+
+package ui
+
+import (
+	"fmt"
+)
+
+// #include "winapi_windows.h"
+import "C"
+
+type progressbar struct {
+	*controlSingleHWND
+}
+
+func newProgressBar() ProgressBar {
+	hwnd := C.newControl(C.xPROGRESS_CLASS,
+		C.PBS_SMOOTH,
+		0)
+	p := &progressbar{
+		controlSingleHWND:		newControlSingleHWND(hwnd),
+	}
+	p.fpreferredSize = p.xpreferredSize
+	p.fnTabStops = func() int {
+		// progress bars are not tab stops
+		return 0
+	}
+	return p
+}
+
+func (p *progressbar) Percent() int {
+	return int(C.SendMessageW(p.hwnd, C.PBM_GETPOS, 0, 0))
+}
+
+func (p *progressbar) SetPercent(percent int) {
+	if percent < 0 || percent > 100 {
+		panic(fmt.Errorf("given ProgressBar percentage %d out of range", percent))
+	}
+	// TODO circumvent aero
+	C.SendMessageW(p.hwnd, C.PBM_SETPOS, C.WPARAM(percent), 0)
+}
+
+const (
+	// via http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx
+	// this is the double-width option
+	progressbarWidth = 237
+	progressbarHeight = 8
+)
+
+func (p *progressbar) xpreferredSize(d *sizing) (width, height int) {
+	return fromdlgunitsX(progressbarWidth, d), fromdlgunitsY(progressbarHeight, d)
+}