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// Copyright 2013 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"syscall"
"unsafe"
)
import (
"github.com/lxn/win"
)
const clipboardWindowClass = `\o/ Walk_Clipboard_Class \o/`
func init() {
MustRegisterWindowClass(clipboardWindowClass)
hwnd := win.CreateWindowEx(
0,
syscall.StringToUTF16Ptr(clipboardWindowClass),
nil,
0,
0,
0,
0,
0,
win.HWND_MESSAGE,
0,
0,
nil)
if hwnd == 0 {
panic("failed to create clipboard window")
}
if !win.AddClipboardFormatListener(hwnd) {
lastError("AddClipboardFormatListener")
}
clipboard.hwnd = hwnd
}
func clipboardWndProc(hwnd win.HWND, msg uint32, wp, lp uintptr) uintptr {
switch msg {
case win.WM_CLIPBOARDUPDATE:
clipboard.contentsChangedPublisher.Publish()
return 0
}
return win.DefWindowProc(hwnd, msg, wp, lp)
}
var clipboard ClipboardService
// Clipboard returns an object that provides access to the system clipboard.
func Clipboard() *ClipboardService {
return &clipboard
}
// ClipboardService provides access to the system clipboard.
type ClipboardService struct {
hwnd win.HWND
contentsChangedPublisher EventPublisher
}
// ContentsChanged returns an Event that you can attach to for handling
// clipboard content changes.
func (c *ClipboardService) ContentsChanged() *Event {
return c.contentsChangedPublisher.Event()
}
// Clear clears the contents of the clipboard.
func (c *ClipboardService) Clear() error {
return c.withOpenClipboard(func() error {
if !win.EmptyClipboard() {
return lastError("EmptyClipboard")
}
return nil
})
}
// ContainsText returns whether the clipboard currently contains text data.
func (c *ClipboardService) ContainsText() (available bool, err error) {
err = c.withOpenClipboard(func() error {
available = win.IsClipboardFormatAvailable(win.CF_UNICODETEXT)
return nil
})
return
}
// Text returns the current text data of the clipboard.
func (c *ClipboardService) Text() (text string, err error) {
err = c.withOpenClipboard(func() error {
hMem := win.HGLOBAL(win.GetClipboardData(win.CF_UNICODETEXT))
if hMem == 0 {
return lastError("GetClipboardData")
}
p := win.GlobalLock(hMem)
if p == nil {
return lastError("GlobalLock()")
}
defer win.GlobalUnlock(hMem)
text = win.UTF16PtrToString((*uint16)(p))
return nil
})
return
}
// SetText sets the current text data of the clipboard.
func (c *ClipboardService) SetText(s string) error {
return c.withOpenClipboard(func() error {
utf16, err := syscall.UTF16FromString(s)
if err != nil {
return err
}
hMem := win.GlobalAlloc(win.GMEM_MOVEABLE, uintptr(len(utf16)*2))
if hMem == 0 {
return lastError("GlobalAlloc")
}
p := win.GlobalLock(hMem)
if p == nil {
return lastError("GlobalLock()")
}
win.MoveMemory(p, unsafe.Pointer(&utf16[0]), uintptr(len(utf16)*2))
win.GlobalUnlock(hMem)
if 0 == win.SetClipboardData(win.CF_UNICODETEXT, win.HANDLE(hMem)) {
// We need to free hMem.
defer win.GlobalFree(hMem)
return lastError("SetClipboardData")
}
// The system now owns the memory referred to by hMem.
return nil
})
}
func (c *ClipboardService) withOpenClipboard(f func() error) error {
if !win.OpenClipboard(c.hwnd) {
return lastError("OpenClipboard")
}
defer win.CloseClipboard()
return f()
}
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