energy/cef/winapi/def-win-api-callback.go

//----------------------------------------
//
// Copyright © yanghy. All Rights Reserved.
//
// Licensed under Apache License Version 2.0, January 2004
//
// https://www.apache.org/licenses/LICENSE-2.0
//
//----------------------------------------

// energy - lcl window api - callback
// TODO : All functions of this API have not been fully tested yet

package winapi

import (
	"github.com/energye/energy/v2/cef/internal/def"
	"github.com/energye/energy/v2/common/imports"
	"github.com/energye/energy/v2/types"
	"github.com/energye/golcl/lcl"
	"github.com/energye/golcl/lcl/api"
	"unsafe"
)

type enumDisplayMonitorsProc func(hMonitor types.HMONITOR, hdcMonitor types.HDC, lprcMonitor types.Rect, dwData types.LPARAM) types.LongBool
type enumFontFamiliesProc func(ELogFont *types.TagEnumLogFontA, Metric *types.TNewTextMetric, FontType types.LongInt, Data types.LPARAM) types.LongInt
type enumFontFamiliesExProc func(ELogFont *types.TagEnumLogFontExA, Metric *types.TNewTextMetricEx, FontType types.LongInt, Data types.LPARAM) types.LongInt

type EnumDisplayMonitorsCallback struct {
	instance uintptr
}

type EnumFontFamiliesCallback struct {
	instance uintptr
}

type EnumFontFamiliesExCallback struct {
	instance uintptr
}

func NewEnumDisplayMonitorsCallback() *EnumDisplayMonitorsCallback {
	return &EnumDisplayMonitorsCallback{}
}

func (m *EnumDisplayMonitorsCallback) Callback(fn enumDisplayMonitorsProc) {
	if m.instance == 0 {
		m.instance = api.MakeEventDataPtr(fn)
	}
}

// Free 使用完需要将释放掉
func (m *EnumDisplayMonitorsCallback) Free() {
	if m.instance != 0 {
		api.RemoveEventElement(m.instance)
		imports.Proc(def.CEF_Win_EnumDisplayMonitorsCallbackFree).Call()
	}
}

func NewEnumFontFamiliesCallback() *EnumFontFamiliesCallback {
	return &EnumFontFamiliesCallback{}
}

func (m *EnumFontFamiliesCallback) Callback(fn enumFontFamiliesProc) {
	if m.instance == 0 {
		m.instance = api.MakeEventDataPtr(fn)
	}
}

// Free 使用完需要将释放掉
func (m *EnumFontFamiliesCallback) Free() {
	if m.instance != 0 {
		api.RemoveEventElement(m.instance)
		imports.Proc(def.CEF_Win_EnumFontFamiliesCallbackFree).Call()
	}
}

func NewEnumFontFamiliesExCallback() *EnumFontFamiliesExCallback {
	return &EnumFontFamiliesExCallback{}
}

func (m *EnumFontFamiliesExCallback) Callback(fn enumFontFamiliesExProc) {
	if m.instance == 0 {
		m.instance = api.MakeEventDataPtr(fn)
		imports.Proc(def.CEF_Win_EnumFontFamiliesExCallbackFree).Call()
	}
}

// Free 使用完需要将释放掉
func (m *EnumFontFamiliesExCallback) Free() {
	if m.instance != 0 {
		api.RemoveEventElement(m.instance)
	}
}

func init() {
	var readAnsiCharOffset = func(ptr uintptr, size int) (result []types.AnsiChar) {
		result = make([]types.AnsiChar, size)
		for i := 0; i < size; i++ {
			result[i] = *(*types.AnsiChar)(unsafe.Pointer(ptr + uintptr(i)))
		}
		return result
	}
	var readDWORDOffset = func(ptr uintptr, size int) (result []types.DWORD) {
		result = make([]types.DWORD, size)
		for i := 0; i < size; i++ {
			result[i] = *(*types.DWORD)(unsafe.Pointer(ptr + uintptr(i)))
		}
		return result
	}
	lcl.RegisterExtEventCallback(func(fn interface{}, getVal func(idx int) uintptr) bool {
		getPtr := func(i int) unsafe.Pointer {
			return unsafe.Pointer(getVal(i))
		}
		switch fn.(type) {
		case enumDisplayMonitorsProc:
			var (
				hMonitor    = types.HMONITOR(getVal(0))
				hdcMonitor  = types.HDC(getVal(1))
				lprcMonitor = *(*types.Rect)(getPtr(2))
				dwData      = types.LPARAM(getVal(3))
				resultPtr   = (*types.LongBool)(getPtr(4))
			)
			*resultPtr = fn.(enumDisplayMonitorsProc)(hMonitor, hdcMonitor, lprcMonitor, dwData)
		case enumFontFamiliesProc:
			var (
				ELogFontPtr = (*types.TagEnumLogFontAPtr)(getPtr(0))
				ELogFont    *types.TagEnumLogFontA
				Metric      = (*types.TNewTextMetric)(getPtr(1))
				FontType    = types.LongInt(getVal(2))
				Data        = types.LPARAM(getVal(3))
				resultPtr   = (*types.LongInt)(getPtr(4))
			)
			ELogFont = &types.TagEnumLogFontA{
				ElfLogFont:  (*types.LogFontA)(unsafe.Pointer(ELogFontPtr.ElfLogFont)),
				ElfFullName: readAnsiCharOffset(ELogFontPtr.ElfFullName, 64),
				ElfStyle:    readAnsiCharOffset(ELogFontPtr.ElfStyle, 32),
			}
			ELogFont.ElfLogFont.LfFaceName = readAnsiCharOffset(ELogFontPtr.LfFaceName, 32)
			*resultPtr = fn.(enumFontFamiliesProc)(ELogFont, Metric, FontType, Data)
		case enumFontFamiliesExProc:
			var (
				ELogFontPtr          = (*types.TagEnumLogFontExAPtr)(getPtr(0))
				ELogFont             *types.TagEnumLogFontExA
				MetricPtr            = (*types.TNewTextMetricExPtr)(getPtr(1))
				Metric               *types.TNewTextMetricEx
				NtmeFontSignaturePtr *types.TFontSignaturePtr
				FontType             = types.LongInt(getVal(2))
				Data                 = types.LPARAM(getVal(3))
				resultPtr            = (*types.LongInt)(getPtr(4))
			)
			ELogFont = &types.TagEnumLogFontExA{
				ElfLogFont:  (*types.LogFontA)(unsafe.Pointer(ELogFontPtr.ElfLogFont)),
				ElfFullName: readAnsiCharOffset(ELogFontPtr.ElfFullName, 64),
				ElfStyle:    readAnsiCharOffset(ELogFontPtr.ElfStyle, 32),
				ElfScript:   readAnsiCharOffset(ELogFontPtr.ElfScript, 32),
			}
			ELogFont.ElfLogFont.LfFaceName = readAnsiCharOffset(ELogFontPtr.LfFaceName, 32)
			NtmeFontSignaturePtr = (*types.TFontSignaturePtr)(unsafe.Pointer(MetricPtr.NtmeFontSignature))
			Metric = &types.TNewTextMetricEx{
				Ntmentm: *(*types.TNewTextMetric)(unsafe.Pointer(MetricPtr.Ntmentm)),
				NtmeFontSignature: types.TFontSignature{
					FsUsb: readDWORDOffset(NtmeFontSignaturePtr.FsUsb, 4),
					FsCsb: readDWORDOffset(NtmeFontSignaturePtr.FsCsb, 2),
				},
			}
			*resultPtr = fn.(enumFontFamiliesExProc)(ELogFont, Metric, FontType, Data)
		default:
			return false
		}
		return true
	})
}