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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 (
"strconv"
"github.com/lxn/win"
)
type Slider struct {
WidgetBase
valueChangedPublisher EventPublisher
layoutFlags LayoutFlags
tracking bool
persistent bool
}
type SliderCfg struct {
Orientation Orientation
ToolTipsHidden bool
}
func NewSlider(parent Container) (*Slider, error) {
return NewSliderWithOrientation(parent, Horizontal)
}
func NewSliderWithOrientation(parent Container, orientation Orientation) (*Slider, error) {
return NewSliderWithCfg(parent, &SliderCfg{Orientation: orientation})
}
func NewSliderWithCfg(parent Container, cfg *SliderCfg) (*Slider, error) {
sl := new(Slider)
var style uint32 = win.WS_TABSTOP | win.WS_VISIBLE
if cfg.Orientation == Vertical {
style |= win.TBS_VERT
sl.layoutFlags = ShrinkableVert | GrowableVert
} else {
sl.layoutFlags = ShrinkableHorz | GrowableHorz
}
if !cfg.ToolTipsHidden {
style |= win.TBS_TOOLTIPS
}
if err := InitWidget(
sl,
parent,
"msctls_trackbar32",
style,
0); err != nil {
return nil, err
}
sl.SetBackground(nullBrushSingleton)
sl.GraphicsEffects().Add(InteractionEffect)
sl.GraphicsEffects().Add(FocusEffect)
sl.MustRegisterProperty("Value", NewProperty(
func() interface{} {
return sl.Value()
},
func(v interface{}) error {
sl.SetValue(assertIntOr(v, 0))
return nil
},
sl.valueChangedPublisher.Event()))
return sl, nil
}
func (sl *Slider) LayoutFlags() LayoutFlags {
return sl.layoutFlags
}
func (sl *Slider) SizeHint() Size {
return sl.MinSizeHint()
}
func (sl *Slider) MinSizeHint() Size {
return sl.dialogBaseUnitsToPixels(Size{20, 20})
}
func (sl *Slider) MinValue() int {
return int(sl.SendMessage(win.TBM_GETRANGEMIN, 0, 0))
}
func (sl *Slider) MaxValue() int {
return int(sl.SendMessage(win.TBM_GETRANGEMAX, 0, 0))
}
func (sl *Slider) SetRange(min, max int) {
sl.SendMessage(win.TBM_SETRANGEMIN, 0, uintptr(min))
sl.SendMessage(win.TBM_SETRANGEMAX, 1, uintptr(max))
}
func (sl *Slider) Value() int {
return int(sl.SendMessage(win.TBM_GETPOS, 0, 0))
}
func (sl *Slider) SetValue(value int) {
sl.SendMessage(win.TBM_SETPOS, 1, uintptr(value))
sl.valueChangedPublisher.Publish()
}
// ValueChanged returns an Event that can be used to track changes to Value.
func (sl *Slider) ValueChanged() *Event {
return sl.valueChangedPublisher.Event()
}
func (sl *Slider) Persistent() bool {
return sl.persistent
}
func (sl *Slider) SetPersistent(value bool) {
sl.persistent = value
}
func (sl *Slider) SaveState() error {
return sl.WriteState(strconv.Itoa(sl.Value()))
}
func (sl *Slider) RestoreState() error {
s, err := sl.ReadState()
if err != nil {
return err
}
value, err := strconv.Atoi(s)
if err != nil {
return err
}
sl.SetValue(value)
return nil
}
func (sl *Slider) Tracking() bool {
return sl.tracking
}
func (sl *Slider) SetTracking(tracking bool) {
sl.tracking = tracking
}
func (sl *Slider) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr {
switch msg {
case win.WM_HSCROLL, win.WM_VSCROLL:
switch win.LOWORD(uint32(wParam)) {
case win.TB_THUMBPOSITION, win.TB_ENDTRACK:
sl.valueChangedPublisher.Publish()
case win.TB_THUMBTRACK:
if sl.tracking {
sl.valueChangedPublisher.Publish()
}
}
return 0
}
return sl.WidgetBase.WndProc(hwnd, msg, wParam, lParam)
}
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