another UI attempt, I guess.

sorry.

src/libui_sdl/libui/windows/progressbar.cpp

@@ -0,0 +1,83 @@
+// 19 may 2015
+#include "uipriv_windows.hpp"
+
+struct uiProgressBar {
+	uiWindowsControl c;
+	HWND hwnd;
+};
+
+uiWindowsControlAllDefaults(uiProgressBar)
+
+// via http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
+#define pbarWidth 237
+#define pbarHeight 8
+
+static void uiProgressBarMinimumSize(uiWindowsControl *c, int *width, int *height)
+{
+	uiProgressBar *p = uiProgressBar(c);
+	uiWindowsSizing sizing;
+	int x, y;
+
+	x = pbarWidth;
+	y = pbarHeight;
+	uiWindowsGetSizing(p->hwnd, &sizing);
+	uiWindowsSizingDlgUnitsToPixels(&sizing, &x, &y);
+	*width = x;
+	*height = y;
+}
+
+#define indeterminate(p) ((getStyle(p->hwnd) & PBS_MARQUEE) != 0)
+
+int uiProgressBarValue(uiProgressBar *p)
+{
+	if (indeterminate(p))
+		return -1;
+	return SendMessage(p->hwnd, PBM_GETPOS, 0, 0);
+}
+
+// unfortunately, as of Vista progress bars have a forced animation on increase
+// we have to set the progress bar to value + 1 and decrease it back to value if we want an "instant" change
+// see http://stackoverflow.com/questions/2217688/windows-7-aero-theme-progress-bar-bug
+// it's not ideal/perfect, but it will have to do
+void uiProgressBarSetValue(uiProgressBar *p, int value)
+{
+	if (value == -1) {
+		if (!indeterminate(p)) {
+			setStyle(p->hwnd, getStyle(p->hwnd) | PBS_MARQUEE);
+			SendMessageW(p->hwnd, PBM_SETMARQUEE, (WPARAM) TRUE, 0);
+		}
+		return;
+	}
+	if (indeterminate(p)) {
+		SendMessageW(p->hwnd, PBM_SETMARQUEE, (WPARAM) FALSE, 0);
+		setStyle(p->hwnd, getStyle(p->hwnd) & ~PBS_MARQUEE);
+	}
+
+	if (value < 0 || value > 100)
+		userbug("Value %d is out of range for uiProgressBars.", value);
+
+	if (value == 100) {			// because we can't 101
+		SendMessageW(p->hwnd, PBM_SETRANGE32, 0, 101);
+		SendMessageW(p->hwnd, PBM_SETPOS, 101, 0);
+		SendMessageW(p->hwnd, PBM_SETPOS, 100, 0);
+		SendMessageW(p->hwnd, PBM_SETRANGE32, 0, 100);
+		return;
+	}
+	SendMessageW(p->hwnd, PBM_SETPOS, (WPARAM) (value + 1), 0);
+	SendMessageW(p->hwnd, PBM_SETPOS, (WPARAM) value, 0);
+}
+
+uiProgressBar *uiNewProgressBar(void)
+{
+	uiProgressBar *p;
+
+	uiWindowsNewControl(uiProgressBar, p);
+
+	p->hwnd = uiWindowsEnsureCreateControlHWND(0,
+		PROGRESS_CLASSW, L"",
+		PBS_SMOOTH,
+		hInstance, NULL,
+		FALSE);
+
+	return p;
+}