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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| // 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 ( | ||
| "log" // TODO remove | ||
| "unsafe" // TODO remove | ||
| ) | ||
|
|
||
| import ( | ||
| "github.com/lxn/win" | ||
| ) | ||
|
|
||
| type Slider struct { | ||
| WidgetBase | ||
| valueChangedPublisher EventPublisher | ||
| layoutFlags LayoutFlags | ||
| } | ||
|
|
||
| func NewSlider(parent Container) (*Slider, error) { | ||
| return NewSliderWithOrientation(parent, Horizontal) | ||
| } | ||
|
|
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| func NewSliderWithOrientation(parent Container, orientation Orientation) (*Slider, error) { | ||
| sl := new(Slider) | ||
|
|
||
| var style uint32 = win.WS_VISIBLE | win.TBS_TOOLTIPS | ||
| if orientation == Vertical { | ||
| style |= win.TBS_VERT | ||
| sl.layoutFlags = ShrinkableVert | GrowableVert | GreedyVert | ||
| } else { | ||
| sl.layoutFlags = ShrinkableHorz | GrowableHorz | GreedyHorz | ||
| } | ||
|
|
||
| if err := InitWidget( | ||
| sl, | ||
| parent, | ||
| "msctls_trackbar32", | ||
| style, | ||
| 0); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| sl.MustRegisterProperty("Value", NewProperty( | ||
| func() interface{} { | ||
| return sl.Value() | ||
| }, | ||
| func(v interface{}) error { | ||
| sl.SetValue(v.(int)) | ||
| return nil | ||
| }, | ||
| sl.valueChangedPublisher.Event())) | ||
|
|
||
| return sl, nil | ||
| } | ||
|
|
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| func (sl *Slider) LayoutFlags() LayoutFlags { | ||
| return sl.layoutFlags | ||
| } | ||
|
|
||
| func (sl *Slider) SizeHint() Size { | ||
| return sl.MinSizeHint() | ||
| } | ||
|
|
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| 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)) | ||
| } | ||
|
|
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| 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() | ||
| } | ||
|
|
||
| // I'm not sure anymore, if this is the right way! | ||
| // It seems the proper way is to hook on WM_HSCROLL and WM_VSCROLL. | ||
| // But they are not received here! | ||
| // I read, a trackbar does not receive them, it sends them to it's parents. | ||
| // Any Idea on what to do then? | ||
| func (sl *Slider) WndProc(hwnd win.HWND, msg uint32, wParam, lParam uintptr) uintptr { | ||
| switch msg { | ||
| case win.WM_NOTIFY: // 0x4E | ||
| code := ((*win.NMHDR)(unsafe.Pointer(lParam))).Code | ||
| switch code { | ||
| case win.TRBN_THUMBPOSCHANGING: | ||
| // TRBN_THUMBPOSCHANGING is documented to exist only on Vista and above. | ||
| // I run windows 10, still I never recieve it. | ||
| log.Fatal("RECEIVED TRBN_THUMBPOSCHANGING") // This never happens. | ||
| sl.valueChangedPublisher.Publish() | ||
| case win.NM_CUSTOMDRAW: | ||
| // This is received however, show we do anything with it? | ||
| nmcd := (*win.NMCUSTOMDRAW)(unsafe.Pointer(lParam)) | ||
| log.Printf("WM_NOTIFY NM_CUSTOMDRAW: %+v code=%x\n", nmcd, nmcd.Hdr.Code) | ||
| default: | ||
| // I don't receive anything else, when I change the slider with an arrow key. | ||
| // There are some others however, when I drag with the mouse. | ||
| log.Printf("Other WM_NOFITY NMHDR CODE: 0x%x\n", code) | ||
| } | ||
| case win.WM_GETDLGCODE: | ||
| // I recieve this too. lParm is 0x8fca8 | ||
| log.Printf("WM_GETDLGCODE: 0x%x 0x%x", wParam, lParam) | ||
| default: | ||
| log.Printf("Other msg: %v 0x%x\n", msg, msg) | ||
| // I receive these other messages, when I press an arrow key on a slider: | ||
| // 0x101 WM_KEYUP | ||
| // 0x100 WM_KEYFIRST | ||
| // 0xf WM_PAINT | ||
| // There is no WM_VSROLL (0x114) or WM_HSCROLL (0x115). | ||
| } | ||
| return sl.WidgetBase.WndProc(hwnd, msg, wParam, lParam) | ||
| } |
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