Initial commit

.gitignore

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+.idea

LICENSE

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+MIT License
+
+Copyright (c) 2020 John Chadwick
+Some portions Copyright (c) 2017 Serge Zaitsev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+
+This is a locally maintained fork of [go-webview2](https://github.com/jchv/go-webview2) 
+that is intended to be used with Wails applications. It is not intended to be used
+as a standalone package.
+
+----------------
+
+# go-webview2
+
+This is a proof of concept for embedding Webview2 into Go without CGo. It is based
+on [webview/webview](https://github.com/webview/webview) and provides a compatible API.
+
+## Notice
+
+Because this version doesn't currently have an EdgeHTML fallback, it will not work unless you have a Webview2 runtime
+installed. In addition, it requires the Webview2Loader DLL in order to function. Adding an EdgeHTML fallback should be
+technically possible but will likely require much worse hacks since the API is not strictly COM to my knowledge.
+
+## Demo
+
+For now, you'll need to install the Webview2 runtime, as it does not ship with Windows.
+
+[WebView2 runtime](https://developer.microsoft.com/en-us/microsoft-edge/webview2/)
+
+After that, you should be able to run go-webview2 directly:
+
+```
+go run go-webview2/cmd/demo
+```
+
+This will use go-winloader to load an embedded copy of WebView2Loader.dll.
+
+If this does not work, please try running from a directory that has an appropriate copy of `WebView2Loader.dll` for your
+GOARCH. If _that_ worked, *please* file a bug so we can figure out what's wrong with go-winloader :)

go.mod

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+module github.com/wailsapp/go-webview2
+
+go 1.20
+
+require (
+	github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e
+	golang.org/x/sys v0.8.0
+)

go.sum

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+github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e h1:Q3+PugElBCf4PFpxhErSzU3/PY5sFL5Z6rfv4AbGAck=
+github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e/go.mod h1:alcuEEnZsY1WQsagKhZDsoPCRoOijYqhZvPwLG0kzVs=
+golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

internal/w32/w32.go

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+//go:build windows
+
+package w32
+
+import (
+	"syscall"
+	"unicode/utf16"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var (
+	ole32               = windows.NewLazySystemDLL("ole32")
+	Ole32CoInitializeEx = ole32.NewProc("CoInitializeEx")
+
+	kernel32                   = windows.NewLazySystemDLL("kernel32")
+	Kernel32GetCurrentThreadID = kernel32.NewProc("GetCurrentThreadId")
+
+	shlwapi                  = windows.NewLazySystemDLL("shlwapi")
+	shlwapiSHCreateMemStream = shlwapi.NewProc("SHCreateMemStream")
+
+	user32                   = windows.NewLazySystemDLL("user32")
+	User32LoadImageW         = user32.NewProc("LoadImageW")
+	User32GetSystemMetrics   = user32.NewProc("GetSystemMetrics")
+	User32RegisterClassExW   = user32.NewProc("RegisterClassExW")
+	User32CreateWindowExW    = user32.NewProc("CreateWindowExW")
+	User32DestroyWindow      = user32.NewProc("DestroyWindow")
+	User32ShowWindow         = user32.NewProc("ShowWindow")
+	User32UpdateWindow       = user32.NewProc("UpdateWindow")
+	User32SetFocus           = user32.NewProc("SetFocus")
+	User32GetMessageW        = user32.NewProc("GetMessageW")
+	User32TranslateMessage   = user32.NewProc("TranslateMessage")
+	User32DispatchMessageW   = user32.NewProc("DispatchMessageW")
+	User32DefWindowProcW     = user32.NewProc("DefWindowProcW")
+	User32GetClientRect      = user32.NewProc("GetClientRect")
+	User32PostQuitMessage    = user32.NewProc("PostQuitMessage")
+	User32SetWindowTextW     = user32.NewProc("SetWindowTextW")
+	User32PostThreadMessageW = user32.NewProc("PostThreadMessageW")
+	User32GetWindowLongPtrW  = user32.NewProc("GetWindowLongPtrW")
+	User32SetWindowLongPtrW  = user32.NewProc("SetWindowLongPtrW")
+	User32AdjustWindowRect   = user32.NewProc("AdjustWindowRect")
+	User32SetWindowPos       = user32.NewProc("SetWindowPos")
+)
+
+const (
+	SystemMetricsCxIcon = 11
+	SystemMetricsCyIcon = 12
+)
+
+const (
+	SWShow = 5
+)
+
+const (
+	SWPNoZOrder     = 0x0004
+	SWPNoActivate   = 0x0010
+	SWPNoMove       = 0x0002
+	SWPFrameChanged = 0x0020
+)
+
+const (
+	WMDestroy       = 0x0002
+	WMMove          = 0x0003
+	WMSize          = 0x0005
+	WMClose         = 0x0010
+	WMQuit          = 0x0012
+	WMGetMinMaxInfo = 0x0024
+	WMNCLButtonDown = 0x00A1
+	WMMoving        = 0x0216
+	WMApp           = 0x8000
+)
+
+const (
+	GWLStyle = -16
+)
+
+const (
+	WSOverlapped       = 0x00000000
+	WSMaximizeBox      = 0x00020000
+	WSThickFrame       = 0x00040000
+	WSCaption          = 0x00C00000
+	WSSysMenu          = 0x00080000
+	WSMinimizeBox      = 0x00020000
+	WSOverlappedWindow = (WSOverlapped | WSCaption | WSSysMenu | WSThickFrame | WSMinimizeBox | WSMaximizeBox)
+)
+
+type WndClassExW struct {
+	CbSize        uint32
+	Style         uint32
+	LpfnWndProc   uintptr
+	CnClsExtra    int32
+	CbWndExtra    int32
+	HInstance     windows.Handle
+	HIcon         windows.Handle
+	HCursor       windows.Handle
+	HbrBackground windows.Handle
+	LpszMenuName  *uint16
+	LpszClassName *uint16
+	HIconSm       windows.Handle
+}
+
+type Rect struct {
+	Left   int32
+	Top    int32
+	Right  int32
+	Bottom int32
+}
+
+type MinMaxInfo struct {
+	PtReserved     Point
+	PtMaxSize      Point
+	PtMaxPosition  Point
+	PtMinTrackSize Point
+	PtMaxTrackSize Point
+}
+
+type Point struct {
+	X, Y int32
+}
+
+type Msg struct {
+	Hwnd     syscall.Handle
+	Message  uint32
+	WParam   uintptr
+	LParam   uintptr
+	Time     uint32
+	Pt       Point
+	LPrivate uint32
+}
+
+func Utf16PtrToString(p *uint16) string {
+	if p == nil {
+		return ""
+	}
+	// Find NUL terminator.
+	end := unsafe.Pointer(p)
+	n := 0
+	for *(*uint16)(end) != 0 {
+		end = unsafe.Pointer(uintptr(end) + unsafe.Sizeof(*p))
+		n++
+	}
+	s := (*[(1 << 30) - 1]uint16)(unsafe.Pointer(p))[:n:n]
+	return string(utf16.Decode(s))
+}
+
+func SHCreateMemStream(data []byte) (uintptr, error) {
+	ret, _, err := shlwapiSHCreateMemStream.Call(
+		uintptr(unsafe.Pointer(&data[0])),
+		uintptr(len(data)),
+	)
+	if ret == 0 {
+		return 0, err
+	}
+
+	return ret, nil
+}