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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 (
"unsafe"
"github.com/lxn/win"
)
const (
DlgCmdNone = 0
DlgCmdOK = win.IDOK
DlgCmdCancel = win.IDCANCEL
DlgCmdAbort = win.IDABORT
DlgCmdRetry = win.IDRETRY
DlgCmdIgnore = win.IDIGNORE
DlgCmdYes = win.IDYES
DlgCmdNo = win.IDNO
DlgCmdClose = win.IDCLOSE
DlgCmdHelp = win.IDHELP
DlgCmdTryAgain = win.IDTRYAGAIN
DlgCmdContinue = win.IDCONTINUE
DlgCmdTimeout = win.IDTIMEOUT
)
const dialogWindowClass = `\o/ Walk_Dialog_Class \o/`
func init() {
MustRegisterWindowClass(dialogWindowClass)
}
type dialogish interface {
DefaultButton() *PushButton
CancelButton() *PushButton
}
type Dialog struct {
FormBase
result int
defaultButton *PushButton
cancelButton *PushButton
centerInOwnerWhenRun bool
}
func NewDialog(owner Form) (*Dialog, error) {
return newDialogWithStyle(owner, win.WS_THICKFRAME)
}
func NewDialogWithFixedSize(owner Form) (*Dialog, error) {
return newDialogWithStyle(owner, 0)
}
func newDialogWithStyle(owner Form, style uint32) (*Dialog, error) {
dlg := &Dialog{
FormBase: FormBase{
owner: owner,
},
}
if err := InitWindow(
dlg,
owner,
dialogWindowClass,
win.WS_CAPTION|win.WS_SYSMENU|style,
0); err != nil {
return nil, err
}
succeeded := false
defer func() {
if !succeeded {
dlg.Dispose()
}
}()
dlg.centerInOwnerWhenRun = owner != nil
dlg.result = DlgCmdNone
succeeded = true
return dlg, nil
}
func (dlg *Dialog) DefaultButton() *PushButton {
return dlg.defaultButton
}
func (dlg *Dialog) SetDefaultButton(button *PushButton) error {
if button != nil && !win.IsChild(dlg.hWnd, button.hWnd) {
return newError("not a descendant of the dialog")
}
succeeded := false
if dlg.defaultButton != nil {
if err := dlg.defaultButton.setAndClearStyleBits(win.BS_PUSHBUTTON, win.BS_DEFPUSHBUTTON); err != nil {
return err
}
defer func() {
if !succeeded {
dlg.defaultButton.setAndClearStyleBits(win.BS_DEFPUSHBUTTON, win.BS_PUSHBUTTON)
}
}()
}
if button != nil {
if err := button.setAndClearStyleBits(win.BS_DEFPUSHBUTTON, win.BS_PUSHBUTTON); err != nil {
return err
}
}
dlg.defaultButton = button
succeeded = true
return nil
}
func (dlg *Dialog) CancelButton() *PushButton {
return dlg.cancelButton
}
func (dlg *Dialog) SetCancelButton(button *PushButton) error {
if button != nil && !win.IsChild(dlg.hWnd, button.hWnd) {
return newError("not a descendant of the dialog")
}
dlg.cancelButton = button
return nil
}
func (dlg *Dialog) Result() int {
return dlg.result
}
func (dlg *Dialog) Accept() {
dlg.Close(DlgCmdOK)
}
func (dlg *Dialog) Cancel() {
dlg.Close(DlgCmdCancel)
}
func (dlg *Dialog) Close(result int) {
dlg.result = result
dlg.FormBase.Close()
}
func (dlg *Dialog) Show() {
if dlg.owner != nil {
var size Size
if layout := dlg.Layout(); layout != nil {
size = layout.MinSize()
min := dlg.MinSize()
size.Width = maxi(size.Width, min.Width)
size.Height = maxi(size.Height, min.Height)
} else {
size = dlg.Size()
}
ob := dlg.owner.Bounds()
if dlg.centerInOwnerWhenRun {
dlg.SetBounds(fitRectToScreen(dlg.hWnd, Rectangle{
ob.X + (ob.Width-size.Width)/2,
ob.Y + (ob.Height-size.Height)/2,
size.Width,
size.Height,
}))
}
} else {
dlg.SetBounds(dlg.Bounds())
}
dlg.FormBase.Show()
}
func fitRectToScreen(hWnd win.HWND, r Rectangle) Rectangle {
var mi win.MONITORINFO
mi.CbSize = uint32(unsafe.Sizeof(mi))
if !win.GetMonitorInfo(win.MonitorFromWindow(
hWnd, win.MONITOR_DEFAULTTOPRIMARY), &mi) {
return r
}
mon := rectangleFromRECT(mi.RcWork)
mon.Height -= int(win.GetSystemMetrics(win.SM_CYCAPTION))
if r.Width <= mon.Width {
switch {
case r.X < mon.X:
r.X = mon.X
case r.X+r.Width > mon.X+mon.Width:
r.X = mon.X + mon.Width - r.Width
}
}
if r.Height <= mon.Height {
switch {
case r.Y < mon.Y:
r.Y = mon.Y
case r.Y+r.Height > mon.Y+mon.Height:
r.Y = mon.Y + mon.Height - r.Height
}
}
return r
}
func (dlg *Dialog) Run() int {
dlg.Show()
dlg.FormBase.Run()
return dlg.result
}
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