Re-added Windows font grabbing code. I won't use it just yet, since I only now realize I don't actually need it for preferred sizes, but eh

1 files changed, 107 insertions, 0 deletions

diff --git a/stdfont_windows.go b/stdfont_windows.go
new file mode 100644
index 0000000..99c2841
--- /dev/null
+++ b/stdfont_windows.go
@@ -0,0 +1,107 @@
+// 10 february 2014
+package ui
+
+import (
+	"fmt"
+//	"syscall"
+	"unsafe"
+)
+
+var (
+	controlFont		_HANDLE
+	titleFont			_HANDLE
+	smallTitleFont		_HANDLE
+	menubarFont		_HANDLE
+	statusbarFont		_HANDLE
+)
+
+const (
+	_SPI_GETNONCLIENTMETRICS = 0x0029
+	_LF_FACESIZE = 32		// from wingdi.h
+)
+
+type _LOGFONT struct {
+	lfHeight			int32
+	lfWidth			int32
+	lfEscapement		int32
+	lfOrientation		int32
+	lfWeight			int32
+	lfItalic			byte
+	lfUnderline		byte
+	lfStrikeOut		byte
+	lfCharSet			byte
+	lfOutPrecision		byte
+	lfClipPrecision		byte
+	lfQuality			byte
+	lfPitchAndFamily	byte
+	lfFaceName		[_LF_FACESIZE]uint16
+}
+
+type _NONCLIENTMETRICS struct {
+	cbSize			uint32
+	iBorderWidth		int32		// originally int
+	iScrollWidth		int32		// originally int
+	iScrollHeight		int32		// originally int
+	iCaptionWidth		int32		// originally int
+	iCaptionHeight		int32		// originally int
+	lfCaptionFont		_LOGFONT
+	iSmCaptionWidth	int32		// originally int
+	iSmCaptionHeight	int32		// originally int
+	lfSmCaptionFont	_LOGFONT
+	iMenuWidth		int32		// originally int
+	iMenuHeight		int32		// originally int
+	lfMenuFont		_LOGFONT
+	lfStatusFont		_LOGFONT
+	lfMessageFont		_LOGFONT
+}
+
+var (
+	_systemParametersInfo = user32.NewProc("SystemParametersInfoW")
+	_createFontIndirect = gdi32.NewProc("CreateFontIndirectW")
+)
+
+// TODO the lfMessageFont doesn't seem like the right one for controls but that's all I could find for what people actually use; also I need to return the other ones and check HWND types to make sure I apply the right font to the right thing...
+func getStandardWindowFonts() (err error) {
+	var ncm _NONCLIENTMETRICS
+
+	ncm.cbSize = uint32(unsafe.Sizeof(ncm))
+	r1, _, err := _systemParametersInfo.Call(
+		uintptr(_SPI_GETNONCLIENTMETRICS),
+		uintptr(unsafe.Sizeof(ncm)),
+		uintptr(unsafe.Pointer(&ncm)),
+		0)
+	if r1 == 0 {		// failure
+		return fmt.Errorf("error getting system parameters: %v", err)
+	}
+
+	getfont := func(which *_LOGFONT, what string) (_HANDLE, error) {
+		// TODO does this specify an error?
+		r1, _, err = _createFontIndirect.Call(uintptr(unsafe.Pointer(which)))
+		if r1 == 0 {		// failure
+			return _NULL, fmt.Errorf("error getting %s font", what, err)
+		}
+		return _HANDLE(r1), nil
+	}
+
+	controlFont, err = getfont(&ncm.lfMessageFont, "control")
+	if err != nil {
+		return err
+	}
+	titleFont, err = getfont(&ncm.lfCaptionFont, "titlebar")
+	if err != nil {
+		return err
+	}
+	smallTitleFont, err = getfont(&ncm.lfSmCaptionFont, "small titlebar")
+	if err != nil {
+		return err
+	}
+	menubarFont, err = getfont(&ncm.lfMenuFont, "menubar")
+	if err != nil {
+		return err
+	}
+	statusbarFont, err = getfont(&ncm.lfStatusFont, "statusbar")
+	if err != nil {
+		return err
+	}
+	return nil		// all good
+}