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// Copyright 2016 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"
)
import (
"github.com/lxn/win"
)
type SplitButton struct {
Button
menu *Menu
}
func NewSplitButton(parent Container) (*SplitButton, error) {
sb := new(SplitButton)
menu, err := NewMenu()
if err != nil {
return nil, err
}
if err := InitWidget(
sb,
parent,
"BUTTON",
win.WS_TABSTOP|win.WS_VISIBLE|win.BS_SPLITBUTTON,
0); err != nil {
return nil, err
}
sb.Button.init()
sb.menu = menu
sb.GraphicsEffects().Add(InteractionEffect)
sb.GraphicsEffects().Add(FocusEffect)
return sb, nil
}
func (sb *SplitButton) Dispose() {
sb.Button.Dispose()
sb.menu.Dispose()
}
func (*SplitButton) LayoutFlags() LayoutFlags {
return GrowableHorz
}
func (sb *SplitButton) MinSizeHint() Size {
var s win.SIZE
sb.SendMessage(win.BCM_GETIDEALSIZE, 0, uintptr(unsafe.Pointer(&s)))
return maxSize(Size{int(s.CX), int(s.CY)}, sb.dialogBaseUnitsToPixels(Size{50, 14}))
}
func (sb *SplitButton) SizeHint() Size {
return sb.MinSizeHint()
}
func (sb *SplitButton) ImageAboveText() bool {
return sb.hasStyleBits(win.BS_TOP)
}
func (sb *SplitButton) SetImageAboveText(value bool) error {
if err := sb.ensureStyleBits(win.BS_TOP, value); err != nil {
return err
}
// We need to set the image again, or Windows will fail to calculate the
// button control size correctly.
return sb.SetImage(sb.image)
}
func (sb *SplitButton) Menu() *Menu {
return sb.menu
}
func (sb *SplitButton) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_NOTIFY:
switch ((*win.NMHDR)(unsafe.Pointer(lParam))).Code {
case win.BCN_DROPDOWN:
dd := (*win.NMBCDROPDOWN)(unsafe.Pointer(lParam))
p := win.POINT{dd.RcButton.Left, dd.RcButton.Bottom}
win.ClientToScreen(sb.hWnd, &p)
win.TrackPopupMenuEx(
sb.menu.hMenu,
win.TPM_NOANIMATION,
p.X,
p.Y,
sb.hWnd,
nil)
return 0
}
}
return sb.Button.WndProc(hwnd, msg, wParam, lParam)
}
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