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// 10 february 2014
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package ui
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import (
// "syscall"
"unsafe"
)
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 int
iScrollWidth int
iScrollHeight int
iCaptionWidth int
iCaptionHeight int
lfCaptionFont LOGFONT
iSmCaptionWidth int
iSmCaptionHeight int
lfSmCaptionFont LOGFONT
iMenuWidth int
iMenuHeight int
lfMenuFont LOGFONT
lfStatusFont LOGFONT
lfMessageFont LOGFONT
}
var (
systemParametersInfo = user32 . NewProc ( "SystemParametersInfoW" )
createFontIndirect = gdi32 . NewProc ( "CreateFontIndirectW" )
)
// TODO adorn errors with which step failed?
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// TODO this specific font doesn't seem like the right one 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...
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func getStandardWindowFont ( ) ( hfont HANDLE , 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 NULL , err
}
// TODO does this specify an error?
r1 , _ , err = createFontIndirect . Call ( uintptr ( unsafe . Pointer ( & ncm . lfMessageFont ) ) )
if r1 == 0 { // failure
return NULL , err
}
return HANDLE ( r1 ) , nil
}