Migrated the Windows backend to use sizer.

1 files changed, 72 insertions, 0 deletions

diff --git a/redo/sizer_windows.go b/redo/sizer_windows.go
new file mode 100644
index 0000000..554b285
--- /dev/null
+++ b/redo/sizer_windows.go
@@ -0,0 +1,72 @@
+// 24 february 2014
+
+package ui
+
+// #include "winapi_windows.h"
+import "C"
+
+// For Windows, Microsoft just hands you a list of preferred control sizes as part of the MSDN documentation and tells you to roll with it.
+// These sizes are given in "dialog units", which are independent of the font in use.
+// We need to convert these into standard pixels, which requires we get the device context of the OS window.
+// References:
+// - http://msdn.microsoft.com/en-us/library/ms645502%28VS.85%29.aspx - the calculation needed
+// - http://support.microsoft.com/kb/125681 - to get the base X and Y
+// (thanks to http://stackoverflow.com/questions/58620/default-button-size)
+
+type sizing struct {
+	sizingbase
+
+	// for size calculations
+	baseX	C.int
+	baseY	C.int
+
+	// for the actual resizing
+	// possibly the HDWP
+}
+
+// note on MulDiv():
+// div will not be 0 in the usages below
+// we also ignore overflow; that isn't likely to happen for our use case anytime soon
+
+func fromdlgunitsX(du int, d *sizing) int {
+	return int(C.MulDiv(C.int(du), d.baseX, 4))
+}
+
+func fromdlgunitsY(du int, d *sizing) int {
+	return int(C.MulDiv(C.int(du), d.baseY, 8))
+}
+
+const (
+	marginDialogUnits = 7
+	paddingDialogUnits = 4
+)
+
+func (s *sizer) beginResize() (d *sizing) {
+	d = new(sizing)
+
+	d.baseX = C.baseX
+	d.baseY = C.baseY
+
+	if spaced {
+		d.xmargin = fromdlgunitsX(marginDialogUnits, d)
+		d.ymargin = fromdlgunitsY(marginDialogUnits, d)
+		d.xpadding = fromdlgunitsX(paddingDialogUnits, d)
+		d.ypadding = fromdlgunitsY(paddingDialogUnits, d)
+	}
+
+	return d
+}
+
+func (s *sizer) translateAllocationCoords(allocations []*allocation, winwidth, winheight int) {
+	// no translation needed on windows
+}
+
+//TODO
+/*
+func (w *widgetbase) preferredSize(d *sizing) (width int, height int) {
+	// the preferred size of an Area is its size
+	if stdDlgSizes[s.ctype].area {
+		return s.areawidth, s.areaheight
+	}
+}
+*/