81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2010 The Walk Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package lib
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import (
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"syscall"
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"unsafe"
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"github.com/lxn/win"
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)
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var (
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registeredWindowClasses = make(map[string]bool)
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defaultWndProcPtr = syscall.NewCallback(defaultWndProc)
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)
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// MustRegisterWindowClass registers the specified window class.
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//
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// MustRegisterWindowClass must be called once for every window type that is not
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// based on any system provided control, before calling InitChildWidget or
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// InitWidget. Calling MustRegisterWindowClass twice with the same className
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// results in a panic.
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func MustRegisterWindowClass(className string) {
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MustRegisterWindowClassWithWndProcPtr(className, defaultWndProcPtr)
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}
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func MustRegisterWindowClassWithStyle(className string, style uint32) {
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MustRegisterWindowClassWithWndProcPtrAndStyle(className, defaultWndProcPtr, style)
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}
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func MustRegisterWindowClassWithWndProcPtr(className string, wndProcPtr uintptr) {
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MustRegisterWindowClassWithWndProcPtrAndStyle(className, wndProcPtr, 0)
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}
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func MustRegisterWindowClassWithWndProcPtrAndStyle(className string, wndProcPtr uintptr, style uint32) {
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if registeredWindowClasses[className] {
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panic("window class already registered")
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}
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hInst := win.GetModuleHandle(nil)
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if hInst == 0 {
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panic("GetModuleHandle")
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}
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hIcon := win.LoadIcon(hInst, win.MAKEINTRESOURCE(7)) // rsrc uses 7 for app icon
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if hIcon == 0 {
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hIcon = win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_APPLICATION))
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}
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if hIcon == 0 {
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panic("LoadIcon")
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}
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hCursor := win.LoadCursor(0, win.MAKEINTRESOURCE(win.IDC_ARROW))
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if hCursor == 0 {
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panic("LoadCursor")
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}
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var wc win.WNDCLASSEX
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wc.CbSize = uint32(unsafe.Sizeof(wc))
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wc.LpfnWndProc = wndProcPtr
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wc.HInstance = hInst
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wc.HIcon = hIcon
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wc.HCursor = hCursor
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wc.HbrBackground = win.COLOR_BTNFACE + 1
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wc.LpszClassName = syscall.StringToUTF16Ptr(className)
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wc.Style = style
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if atom := win.RegisterClassEx(&wc); atom == 0 {
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panic("RegisterClassEx")
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}
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registeredWindowClasses[className] = true
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}
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func defaultWndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) (result uintptr) {
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return win.DefWindowProc(hwnd, msg, wParam, lParam)
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}
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