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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.
// +build windows
package walk
import (
"strconv"
"github.com/lxn/win"
)
type CheckState int
const (
CheckUnchecked CheckState = win.BST_UNCHECKED
CheckChecked CheckState = win.BST_CHECKED
CheckIndeterminate CheckState = win.BST_INDETERMINATE
)
var checkBoxCheckSize Size
type CheckBox struct {
Button
checkStateChangedPublisher EventPublisher
}
func NewCheckBox(parent Container) (*CheckBox, error) {
cb := new(CheckBox)
if err := InitWidget(
cb,
parent,
"BUTTON",
win.WS_TABSTOP|win.WS_VISIBLE|win.BS_AUTOCHECKBOX,
0); err != nil {
return nil, err
}
cb.Button.init()
cb.SetBackground(nullBrushSingleton)
cb.GraphicsEffects().Add(InteractionEffect)
cb.GraphicsEffects().Add(FocusEffect)
cb.MustRegisterProperty("CheckState", NewProperty(
func() interface{} {
return cb.CheckState()
},
func(v interface{}) error {
cb.SetCheckState(CheckState(assertIntOr(v, 0)))
return nil
},
cb.CheckStateChanged()))
return cb, nil
}
func (*CheckBox) LayoutFlags() LayoutFlags {
return 0
}
func (cb *CheckBox) SizeHint() Size {
return cb.MinSizeHint()
}
func (cb *CheckBox) TextOnLeftSide() bool {
return cb.hasStyleBits(win.BS_LEFTTEXT)
}
func (cb *CheckBox) SetTextOnLeftSide(textLeft bool) error {
return cb.ensureStyleBits(win.BS_LEFTTEXT, textLeft)
}
func (cb *CheckBox) setChecked(checked bool) {
cb.Button.setChecked(checked)
cb.checkStateChangedPublisher.Publish()
}
func (cb *CheckBox) Tristate() bool {
return cb.hasStyleBits(win.BS_AUTO3STATE)
}
func (cb *CheckBox) SetTristate(tristate bool) error {
var set, clear uint32
if tristate {
set, clear = win.BS_AUTO3STATE, win.BS_AUTOCHECKBOX
} else {
set, clear = win.BS_AUTOCHECKBOX, win.BS_AUTO3STATE
}
return cb.setAndClearStyleBits(set, clear)
}
func (cb *CheckBox) CheckState() CheckState {
return CheckState(cb.SendMessage(win.BM_GETCHECK, 0, 0))
}
func (cb *CheckBox) SetCheckState(state CheckState) {
if state == cb.CheckState() {
return
}
cb.SendMessage(win.BM_SETCHECK, uintptr(state), 0)
cb.checkedChangedPublisher.Publish()
cb.checkStateChangedPublisher.Publish()
}
func (cb *CheckBox) CheckStateChanged() *Event {
return cb.checkStateChangedPublisher.Event()
}
func (cb *CheckBox) SaveState() error {
return cb.WriteState(strconv.Itoa(int(cb.CheckState())))
}
func (cb *CheckBox) RestoreState() error {
s, err := cb.ReadState()
if err != nil {
return err
}
cs, err := strconv.Atoi(s)
if err != nil {
return err
}
cb.SetCheckState(CheckState(cs))
return nil
}
func (cb *CheckBox) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_COMMAND:
switch win.HIWORD(uint32(wParam)) {
case win.BN_CLICKED:
cb.checkedChangedPublisher.Publish()
cb.checkStateChangedPublisher.Publish()
}
}
return cb.Button.WndProc(hwnd, msg, wParam, lParam)
}
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