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// Copyright 2012 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 ProgressIndicator struct {
hwnd win.HWND
taskbarList3 *win.ITaskbarList3
completed uint32
total uint32
state PIState
}
type PIState int
const (
PINoProgress PIState = win.TBPF_NOPROGRESS
PIIndeterminate PIState = win.TBPF_INDETERMINATE
PINormal PIState = win.TBPF_NORMAL
PIError PIState = win.TBPF_ERROR
PIPaused PIState = win.TBPF_PAUSED
)
//newTaskbarList3 precondition: Windows version is at least 6.1 (yes, Win 7 is version 6.1).
func newTaskbarList3(hwnd win.HWND) (*ProgressIndicator, error) {
var classFactoryPtr unsafe.Pointer
if hr := win.CoGetClassObject(&win.CLSID_TaskbarList, win.CLSCTX_ALL, nil, &win.IID_IClassFactory, &classFactoryPtr); win.FAILED(hr) {
return nil, errorFromHRESULT("CoGetClassObject", hr)
}
var taskbarList3ObjectPtr unsafe.Pointer
classFactory := (*win.IClassFactory)(classFactoryPtr)
defer classFactory.Release()
if hr := classFactory.CreateInstance(nil, &win.IID_ITaskbarList3, &taskbarList3ObjectPtr); win.FAILED(hr) {
return nil, errorFromHRESULT("IClassFactory.CreateInstance", hr)
}
return &ProgressIndicator{taskbarList3: (*win.ITaskbarList3)(taskbarList3ObjectPtr), hwnd: hwnd}, nil
}
func (pi *ProgressIndicator) SetState(state PIState) error {
if hr := pi.taskbarList3.SetProgressState(pi.hwnd, (int)(state)); win.FAILED(hr) {
return errorFromHRESULT("ITaskbarList3.setprogressState", hr)
}
pi.state = state
return nil
}
func (pi *ProgressIndicator) State() PIState {
return pi.state
}
func (pi *ProgressIndicator) SetTotal(total uint32) {
pi.total = total
}
func (pi *ProgressIndicator) Total() uint32 {
return pi.total
}
func (pi *ProgressIndicator) SetCompleted(completed uint32) error {
if hr := pi.taskbarList3.SetProgressValue(pi.hwnd, completed, pi.total); win.FAILED(hr) {
return errorFromHRESULT("ITaskbarList3.SetProgressValue", hr)
}
pi.completed = completed
return nil
}
func (pi *ProgressIndicator) Completed() uint32 {
return pi.completed
}
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