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// 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
}
|
