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// Copyright 2011 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 (
"github.com/lxn/win"
)
const splitterHandleWindowClass = "WireGuard UI - SplitterHandle"
func init() {
MustRegisterWindowClass(splitterHandleWindowClass)
}
type splitterHandle struct {
WidgetBase
}
func newSplitterHandle(splitter *Splitter) (*splitterHandle, error) {
if splitter == nil {
return nil, newError("splitter cannot be nil")
}
sh := new(splitterHandle)
sh.parent = splitter
if err := InitWindow(
sh,
splitter,
splitterHandleWindowClass,
win.WS_CHILD|win.WS_VISIBLE,
0); err != nil {
return nil, err
}
sh.SetBackground(NullBrush())
if err := sh.setAndClearStyleBits(0, win.WS_CLIPSIBLINGS); err != nil {
return nil, err
}
return sh, nil
}
func (sh *splitterHandle) LayoutFlags() LayoutFlags {
splitter, ok := sh.Parent().(*Splitter)
if !ok {
return 0
}
if splitter.Orientation() == Horizontal {
return ShrinkableVert | GrowableVert | GreedyVert
}
return ShrinkableHorz | GrowableHorz | GreedyHorz
}
func (sh *splitterHandle) MinSizeHint() Size {
return sh.SizeHint()
}
func (sh *splitterHandle) SizeHint() Size {
splitter, ok := sh.Parent().(*Splitter)
if !ok {
return Size{}
}
handleWidth := splitter.HandleWidth()
var size Size
if splitter.Orientation() == Horizontal {
size.Width = handleWidth
} else {
size.Height = handleWidth
}
return size
}
func (sh *splitterHandle) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_ERASEBKGND:
if sh.Background() == nullBrushSingleton {
return 1
}
case win.WM_PAINT:
if sh.Background() == nullBrushSingleton {
var ps win.PAINTSTRUCT
win.BeginPaint(hwnd, &ps)
defer win.EndPaint(hwnd, &ps)
return 0
}
}
return sh.WidgetBase.WndProc(hwnd, msg, wParam, lParam)
}
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