117 lines
2.3 KiB
Go
117 lines
2.3 KiB
Go
// 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 = `\o/ Walk_SplitterHandle_Class \o/`
|
|
|
|
func init() {
|
|
AppendToWalkInit(func() {
|
|
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) 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)
|
|
}
|
|
|
|
func (sh *splitterHandle) CreateLayoutItem(ctx *LayoutContext) LayoutItem {
|
|
var orientation Orientation
|
|
var handleWidth int
|
|
|
|
if splitter, ok := sh.Parent().(*Splitter); ok {
|
|
orientation = splitter.Orientation()
|
|
handleWidth = splitter.HandleWidth()
|
|
}
|
|
|
|
return &splitterHandleLayoutItem{
|
|
orientation: orientation,
|
|
handleWidth: handleWidth,
|
|
}
|
|
}
|
|
|
|
type splitterHandleLayoutItem struct {
|
|
LayoutItemBase
|
|
orientation Orientation
|
|
handleWidth int
|
|
}
|
|
|
|
func (li *splitterHandleLayoutItem) LayoutFlags() LayoutFlags {
|
|
if li.orientation == Horizontal {
|
|
return ShrinkableVert | GrowableVert | GreedyVert
|
|
}
|
|
|
|
return ShrinkableHorz | GrowableHorz | GreedyHorz
|
|
}
|
|
|
|
func (li *splitterHandleLayoutItem) IdealSize() Size {
|
|
var size Size
|
|
dpi := int(win.GetDpiForWindow(li.handle))
|
|
|
|
if li.orientation == Horizontal {
|
|
size.Width = IntFrom96DPI(li.handleWidth, dpi)
|
|
} else {
|
|
size.Height = IntFrom96DPI(li.handleWidth, dpi)
|
|
}
|
|
|
|
return size
|
|
}
|
|
|
|
func (li *splitterHandleLayoutItem) MinSize() Size {
|
|
return li.IdealSize()
|
|
}
|