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lineedit.go
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lineedit.go
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// Copyright 2010 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.
package walk
import (
"syscall"
"unsafe"
)
import . "github.com/lxn/go-winapi"
type LineEdit struct {
WidgetBase
validator Validator
editingFinishedPublisher EventPublisher
returnPressedPublisher EventPublisher
textChanged EventPublisher
}
func newLineEdit(parent Widget) (*LineEdit, error) {
le := &LineEdit{}
if err := InitWidget(
le,
parent,
"EDIT",
WS_CHILD|WS_TABSTOP|WS_VISIBLE|ES_AUTOHSCROLL,
WS_EX_CLIENTEDGE); err != nil {
return nil, err
}
return le, nil
}
func NewLineEdit(parent Container) (*LineEdit, error) {
if parent == nil {
return nil, newError("parent cannot be nil")
}
le, err := newLineEdit(parent)
if err != nil {
return nil, err
}
var succeeded bool
defer func() {
if !succeeded {
le.Dispose()
}
}()
le.parent = parent
if err = parent.Children().Add(le); err != nil {
return nil, err
}
succeeded = true
return le, nil
}
func (le *LineEdit) CueBanner() string {
buf := make([]uint16, 128)
if FALSE == SendMessage(le.hWnd, EM_GETCUEBANNER, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf))) {
newError("EM_GETCUEBANNER failed")
return ""
}
return syscall.UTF16ToString(buf)
}
func (le *LineEdit) SetCueBanner(value string) error {
if FALSE == SendMessage(le.hWnd, EM_SETCUEBANNER, FALSE, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(value)))) {
return newError("EM_SETCUEBANNER failed")
}
return nil
}
func (le *LineEdit) MaxLength() int {
return int(SendMessage(le.hWnd, EM_GETLIMITTEXT, 0, 0))
}
func (le *LineEdit) SetMaxLength(value int) {
SendMessage(le.hWnd, EM_LIMITTEXT, uintptr(value), 0)
}
func (le *LineEdit) Text() string {
return widgetText(le.hWnd)
}
func (le *LineEdit) SetText(value string) error {
return setWidgetText(le.hWnd, value)
}
func (le *LineEdit) TextSelection() (start, end int) {
SendMessage(le.hWnd, EM_GETSEL, uintptr(unsafe.Pointer(&start)), uintptr(unsafe.Pointer(&end)))
return
}
func (le *LineEdit) SetTextSelection(start, end int) {
SendMessage(le.hWnd, EM_SETSEL, uintptr(start), uintptr(end))
}
func (le *LineEdit) PasswordMode() bool {
return SendMessage(le.hWnd, EM_GETPASSWORDCHAR, 0, 0) != 0
}
func (le *LineEdit) SetPasswordMode(value bool) {
SendMessage(le.hWnd, EM_SETPASSWORDCHAR, uintptr('*'), 0)
}
func (le *LineEdit) ReadOnly() bool {
return le.hasStyleBits(ES_READONLY)
}
func (le *LineEdit) SetReadOnly(readOnly bool) error {
if 0 == SendMessage(le.hWnd, EM_SETREADONLY, uintptr(BoolToBOOL(readOnly)), 0) {
return newError("SendMessage(EM_SETREADONLY)")
}
return nil
}
func (le *LineEdit) Validator() Validator {
return le.validator
}
func (le *LineEdit) SetValidator(validator Validator) {
le.validator = validator
}
func (*LineEdit) LayoutFlags() LayoutFlags {
return ShrinkableHorz | GrowableHorz | GreedyHorz
}
func (le *LineEdit) MinSizeHint() Size {
return le.dialogBaseUnitsToPixels(Size{20, 12})
}
func (le *LineEdit) SizeHint() Size {
return le.dialogBaseUnitsToPixels(Size{50, 12})
}
func (le *LineEdit) EditingFinished() *Event {
return le.editingFinishedPublisher.Event()
}
func (le *LineEdit) ReturnPressed() *Event {
return le.returnPressedPublisher.Event()
}
func (le *LineEdit) TextChanged() *Event {
return le.textChanged.Event()
}
func (le *LineEdit) WndProc(hwnd HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
/* case WM_CHAR:
if le.validator == nil {
break
}
s := []uint16{uint16(wParam), 0}
str := le.Text() + UTF16PtrToString(&s[0])
if le.validator.Validate(str) == Invalid {
return 0
}*/
case WM_COMMAND:
switch HIWORD(uint32(wParam)) {
case EN_CHANGE:
le.textChanged.Publish()
}
case WM_GETDLGCODE:
if root := rootWidget(le); root != nil {
if dlg, ok := root.(dialogish); ok {
if dlg.DefaultButton() != nil {
// If the LineEdit lives in a Dialog that has a DefaultButton,
// we won't swallow the return key.
break
}
}
}
if wParam == VK_RETURN {
return DLGC_WANTALLKEYS
}
case WM_KEYDOWN:
if wParam == VK_RETURN {
le.returnPressedPublisher.Publish()
le.editingFinishedPublisher.Publish()
}
case WM_KILLFOCUS:
// FIXME: This may be dangerous, see remarks section:
// http://msdn.microsoft.com/en-us/library/ms646282(v=vs.85).aspx
le.editingFinishedPublisher.Publish()
}
return le.WidgetBase.WndProc(hwnd, msg, wParam, lParam)
}