对于使用WPF构建的视图，我想在应用程序繁忙且无响应时将鼠标光标更改为沙漏。
一种解决方案是添加
this.Cursor = Cursors.Wait;
到可能导致用户界面无响应的所有地方。但显然这不是最好的解决方案。我想知道实现这个目标的最佳途径是什么？
是否可以通过使用样式或资源来实现这一目标？
谢谢，
答案 0 :(得分：206)
我们做了一个一次性类，当应用程序需要很长时间时为我们更改光标，它看起来像这样：
public class WaitCursor : IDisposable
{
private Cursor _previousCursor;
public WaitCursor()
{
_previousCursor = Mouse.OverrideCursor;
Mouse.OverrideCursor = Cursors.Wait;
}
#region IDisposable Members
public void Dispose()
{
Mouse.OverrideCursor = _previousCursor;
}
#endregion
}
我们这样使用它：
using(new WaitCursor())
{
// very long task
}
可能不是最伟大的设计，但它可以解决问题=）
答案 1 :(得分：37)
我用这里的答案来构建一些对我有用的东西。问题是，当Carlo的答案中的使用块完成时，UI实际上可能仍然忙于数据绑定。由于在块中执行的操作可能会触发延迟加载的数据或事件。在我的情况下，有时从等待标记消失几秒钟，直到UI实际准备好。 我通过创建一个设置waitcursor的辅助方法解决了这个问题，并且还负责设置一个计时器，当UI准备就绪时会自动设置光标。 我无法确定这个设计是否适用于所有情况，但它对我有用：
/// <summary>
/// Contains helper methods for UI, so far just one for showing a waitcursor
/// </summary>
public static class UiServices
{
/// <summary>
/// A value indicating whether the UI is currently busy
/// </summary>
private static bool IsBusy;
/// <summary>
/// Sets the busystate as busy.
/// </summary>
public static void SetBusyState()
{
SetBusyState(true);
}
/// <summary>
/// Sets the busystate to busy or not busy.
/// </summary>
/// <param name="busy">if set to <c>true</c> the application is now busy.</param>
private static void SetBusyState(bool busy)
{
if (busy != IsBusy)
{
IsBusy = busy;
Mouse.OverrideCursor = busy ? Cursors.Wait : null;
if (IsBusy)
{
new DispatcherTimer(TimeSpan.FromSeconds(0), DispatcherPriority.ApplicationIdle, dispatcherTimer_Tick, Application.Current.Dispatcher);
}
}
}
/// <summary>
/// Handles the Tick event of the dispatcherTimer control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private static void dispatcherTimer_Tick(object sender, EventArgs e)
{
var dispatcherTimer = sender as DispatcherTimer;
if (dispatcherTimer != null)
{
SetBusyState(false);
dispatcherTimer.Stop();
}
}
}
答案 2 :(得分：6)
最佳方式是不会导致UI无响应，将所有工作卸载到其他线程/任务。
除此之外，你很喜欢catch-22：如果你确实添加了一种检测ui无响应的方法，那么就没有好办法改变光标，因为你需要的地方这样做（偶数线程）是无响应的...你可能能够解决标准的win32代码来改变整个窗口的光标吗？
否则，你必须先发制人，就像你提出的问题一样。
答案 3 :(得分：5)
我只是在做
Mouse.OverrideCursor = Cursors.Wait;
try {
// Long lasting stuff ...
} finally {
Mouse.OverrideCursor = null;
}
根据Mouse.OverrideCursor Property
的文件要清除覆盖Cursor，请将OverrideCursor设置为null。
try-finally语句确保在任何情况下都恢复默认光标，无论是发生异常还是try-part都留有return或break（如果在循环内）
答案 4 :(得分：3)
这里要小心，因为摆弄Wait Cursor会导致STA线程出现一些问题。确保如果你使用这个东西，你在自己的线程中这样做。 我在这里发布了一个示例Run inside an STA，它使用它来显示一个WaitCursor，同时生成的文件正在启动，并且不会爆炸（主应用程序）AFAICT。
答案 5 :(得分：3)
我个人更喜欢看不到鼠标指针从沙漏到箭头多次切换。 为了帮助防止这种行为，同时调用嵌入式函数需要一段时间，每次尝试控制鼠标指针，我使用一个堆栈（计数器），我称之为LifeTrackerStack。并且只有当堆栈为空（反对0）时，我才将小时玻璃设置为箭头。
我也使用MVVM。我也更喜欢线程安全代码。
在我的模型的根类中，我声明我的LifeTrackerStack，我要么在子模型类中填充，要么在我从它们访问它时直接从子模型类中使用。
我的生活跟踪器有2个状态/动作：
然后在我看来，我手动绑定到我的Model.IsBusy并执行：
void ModelPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "IsBusy")
{
if (this._modelViewAnalysis.IsBusy)
{
if (Application.Current.Dispatcher.CheckAccess())
{
this.Cursor = Cursors.Wait;
}
else
{
Application.Current.Dispatcher.Invoke(new Action(() => this.Cursor = Cursors.Wait));
}
}
else
{
Application.Current.Dispatcher.Invoke(new Action(() => this.Cursor = null));
}
}
这是我的班级LifeTrackerStack：
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading;
namespace HQ.Util.General
{
/// <summary>
/// Usage is to have only one event for a recursive call on many objects
/// </summary>
public class LifeTrackerStack
{
// ******************************************************************
protected readonly Action _stackCreationAction;
protected readonly Action _stackDisposeAction;
private int _refCount = 0;
private object _objLock = new object();
// ******************************************************************
public LifeTrackerStack(Action stackCreationAction = null, Action stackDisposeAction = null)
{
_stackCreationAction = stackCreationAction;
_stackDisposeAction = stackDisposeAction;
}
// ******************************************************************
/// <summary>
/// Return a new LifeTracker to be used in a 'using' block in order to ensure reliability
/// </summary>
/// <returns></returns>
public LifeTracker GetNewLifeTracker()
{
LifeTracker lifeTracker = new LifeTracker(AddRef, RemoveRef);
return lifeTracker;
}
// ******************************************************************
public int Count
{
get { return _refCount; }
}
// ******************************************************************
public void Reset()
{
lock (_objLock)
{
_refCount = 0;
if (_stackDisposeAction != null)
{
_stackDisposeAction();
}
}
}
// ******************************************************************
private void AddRef()
{
lock (_objLock)
{
if (_refCount == 0)
{
if (_stackCreationAction != null)
{
_stackCreationAction();
}
}
_refCount++;
}
}
// ******************************************************************
private void RemoveRef()
{
bool shouldDispose = false;
lock (_objLock)
{
if (_refCount > 0)
{
_refCount--;
}
if (_refCount == 0)
{
if (_stackDisposeAction != null)
{
_stackDisposeAction();
}
}
}
}
// ******************************************************************
}
}
using System;
namespace HQ.Util.General
{
public delegate void ActionDelegate();
public class LifeTracker : IDisposable
{
private readonly ActionDelegate _actionDispose;
public LifeTracker(ActionDelegate actionCreation, ActionDelegate actionDispose)
{
_actionDispose = actionDispose;
if (actionCreation != null)
actionCreation();
}
private bool _disposed = false;
public void Dispose()
{
Dispose(true);
// This object will be cleaned up by the Dispose method.
// Therefore, you should call GC.SupressFinalize to
// take this object off the finalization queue
// and prevent finalization code for this object
// from executing a second time.
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
// Check to see if Dispose has already been called.
if (!this._disposed)
{
// If disposing equals true, dispose all managed
// and unmanaged resources.
if (disposing)
{
_actionDispose();
}
// Note disposing has been done.
_disposed = true;
}
}
}
}
使用它：
_busyStackLifeTracker = new LifeTrackerStack
(
() =>
{
this.IsBusy = true;
},
() =>
{
this.IsBusy = false;
}
);
到处都有我漫长的慢跑，我这样做：
using (this.BusyStackLifeTracker.GetNewLifeTracker())
{
// long job
}
它对我有用。 希望它可以帮助任何！ 埃里克
答案 6 :(得分：1)
更改光标并不意味着应用程序在长时间运行的任务完成后不会响应鼠标和键盘事件。为避免用户误导，我使用下面的类从应用程序消息队列中删除所有键盘和鼠标消息。
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Input;
public class WpfHourGlass : IDisposable
{
[StructLayout(LayoutKind.Sequential)]
private struct POINTAPI
{
public int x;
public int y;
}
[StructLayout(LayoutKind.Sequential)]
private struct MSG
{
public int hwnd;
public int message;
public int wParam;
public int lParam;
public int time;
public POINTAPI pt;
}
private const short PM_REMOVE = 0x1;
private const short WM_MOUSELAST = 0x209;
private const short WM_MOUSEFIRST = 0x200;
private const short WM_KEYFIRST = 0x100;
private const short WM_KEYLAST = 0x108;
[DllImport("user32", EntryPoint = "PeekMessageA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int PeekMessage([MarshalAs(UnmanagedType.Struct)]
ref MSG lpMsg, int hwnd, int wMsgFilterMin, int wMsgFilterMax, int wRemoveMsg);
public WpfHourGlass()
{
Mouse.OverrideCursor = Cursors.Wait;
bActivated = true;
}
public void Show(bool Action = true)
{
if (Action)
{
Mouse.OverrideCursor = Cursors.Wait;
}
else
{
Mouse.OverrideCursor = Cursors.Arrow;
}
bActivated = Action;
}
#region "IDisposable Support"
// To detect redundant calls
private bool disposedValue;
private bool bActivated;
// IDisposable
protected virtual void Dispose(bool disposing)
{
if (!this.disposedValue)
{
if (disposing)
{
//remove todas as mensagens de mouse
//e teclado que tenham sido produzidas
//durante o processamento e estejam
//enfileiradas
if (bActivated)
{
MSG pMSG = new MSG();
while (Convert.ToBoolean(PeekMessage(ref pMSG, 0, WM_KEYFIRST, WM_KEYLAST, PM_REMOVE)))
{
}
while (Convert.ToBoolean(PeekMessage(ref pMSG, 0, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE)))
{
}
Mouse.OverrideCursor = Cursors.Arrow;
}
}
// TODO: free unmanaged resources (unmanaged objects) and override Finalize() below.
// TODO: set large fields to null.
}
this.disposedValue = true;
}
public void Dispose()
{
// Do not change this code. Put cleanup code in Dispose(ByVal disposing As Boolean) above.
Dispose(true);
GC.SuppressFinalize(this);
}
#endregion
}
答案 7 :(得分：1)
我使用了Olivier Jacot-Descombes的解决方案，它非常简单且运行良好。 谢谢。 更新：它甚至可以很好地工作，而无需使用不同的线程/后台工作程序。
我将它与backgroudworker一起使用，鼠标光标在工作繁忙时看起来很棒，并在工作完成后恢复正常。
public void pressButtonToDoSomeLongTimeWork()
{
Mouse.OverrideCursor = Cursors.Wait;
// before the long time work, change mouse cursor to wait cursor
worker.DoWork += doWorkLongTimeAsync;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
worker.RunWorkerAsync(); //start doing some long long time work but GUI can update
}
private void worker_RunWorkerCompleted(object sender,
RunWorkerCompletedEventArgs e)
{
//long time work is done();
updateGuiToShowTheLongTimeWorkResult();
Mouse.OverrideCursor = null; //return mouse cursor to normal
}
答案 8 :(得分：0)
我知道我来晚了，我只是更改了管理应用程序的光标Hourglass（繁忙状态）的方式。
此提议的解决方案比我的第一个答案更复杂，但我认为它更完整，更好。
我没有说我有一个简单的解决方案或完整的解决方案。但是对我来说，这是最好的，因为它可以解决我在管理应用程序繁忙状态时遇到的所有麻烦。
优势：
代码分为几类：
这是用法：
初始化：
public partial class App : Application
{
// ******************************************************************
protected override void OnStartup(StartupEventArgs e)
{
Global.Init(Application.Current.Dispatcher);
AppGlobal.Init(Application.Current.Dispatcher);
首选用法：
using (Global.Instance.GetDisposableBusyState())
{
...
}
其他用法：
// ******************************************************************
public DlgAddAggregateCalc()
{
InitializeComponent();
Model = DataContext as DlgAddAggregateCalcViewModel;
this.Activated += OnActivated;
this.Deactivated += OnDeactivated;
}
// ************************************************************************
private void OnDeactivated(object sender, EventArgs eventArgs)
{
Global.Instance.PullState();
}
// ************************************************************************
private void OnActivated(object sender, EventArgs eventArgs)
{
Global.Instance.PushState(false);
}
自动窗口光标：
public partial class DlgAddSignalResult : Window
{
readonly WindowWithAutoBusyState _autoBusyState = new WindowWithAutoBusyState();
// ******************************************************************
public DlgAddSignalResult()
{
InitializeComponent();
Model = DataContext as DlgAddSignalResultModel;
_autoBusyState.Init(this);
}
代码：
// Copyright (c) 2008 Daniel Grunwald
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
/* Usage:
*
*
*
public delegate void FileChangedHandler(object sender, FileSystemEventArgs e);
[field: NonSerialized]
private readonly SmartWeakEvent<FileChangedHandler> _weakFileChanged = new SmartWeakEvent<FileChangedHandler>();
public event FileChangedHandler FileChanged
{
add
{
_weakFileChanged.Add(value);
}
remove
{
_weakFileChanged.Remove(value);
}
}
*
*
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;
namespace HQ.Util.General.WeakEvent
{
/// <summary>
/// A class for managing a weak event.
/// </summary>
public sealed class SmartWeakEvent<T> where T : class
{
struct EventEntry
{
public readonly MethodInfo TargetMethod;
public readonly WeakReference TargetReference;
public EventEntry(MethodInfo targetMethod, WeakReference targetReference)
{
this.TargetMethod = targetMethod;
this.TargetReference = targetReference;
}
}
readonly List<EventEntry> eventEntries = new List<EventEntry>();
// EO: Added for ObservableCollectionWeak
public int CountOfDelegateEntry
{
get
{
RemoveDeadEntries();
return eventEntries.Count;
}
}
static SmartWeakEvent()
{
if (!typeof(T).IsSubclassOf(typeof(Delegate)))
throw new ArgumentException("T must be a delegate type");
MethodInfo invoke = typeof(T).GetMethod("Invoke");
if (invoke == null || invoke.GetParameters().Length != 2)
throw new ArgumentException("T must be a delegate type taking 2 parameters");
ParameterInfo senderParameter = invoke.GetParameters()[0];
if (senderParameter.ParameterType != typeof(object))
throw new ArgumentException("The first delegate parameter must be of type 'object'");
ParameterInfo argsParameter = invoke.GetParameters()[1];
if (!(typeof(EventArgs).IsAssignableFrom(argsParameter.ParameterType)))
throw new ArgumentException("The second delegate parameter must be derived from type 'EventArgs'");
if (invoke.ReturnType != typeof(void))
throw new ArgumentException("The delegate return type must be void.");
}
public void Add(T eh)
{
if (eh != null)
{
Delegate d = (Delegate)(object)eh;
if (d.Method.DeclaringType.GetCustomAttributes(typeof(CompilerGeneratedAttribute), false).Length != 0)
throw new ArgumentException("Cannot create weak event to anonymous method with closure.");
if (eventEntries.Count == eventEntries.Capacity)
RemoveDeadEntries();
WeakReference target = d.Target != null ? new WeakReference(d.Target) : null;
eventEntries.Add(new EventEntry(d.Method, target));
}
}
void RemoveDeadEntries()
{
eventEntries.RemoveAll(ee => ee.TargetReference != null && !ee.TargetReference.IsAlive);
}
public void Remove(T eh)
{
if (eh != null)
{
Delegate d = (Delegate)(object)eh;
for (int i = eventEntries.Count - 1; i >= 0; i--)
{
EventEntry entry = eventEntries[i];
if (entry.TargetReference != null)
{
object target = entry.TargetReference.Target;
if (target == null)
{
eventEntries.RemoveAt(i);
}
else if (target == d.Target && entry.TargetMethod == d.Method)
{
eventEntries.RemoveAt(i);
break;
}
}
else
{
if (d.Target == null && entry.TargetMethod == d.Method)
{
eventEntries.RemoveAt(i);
break;
}
}
}
}
}
public void Raise(object sender, EventArgs e)
{
int stepExceptionHelp = 0;
try
{
bool needsCleanup = false;
object[] parameters = {sender, e};
foreach (EventEntry ee in eventEntries.ToArray())
{
stepExceptionHelp = 1;
if (ee.TargetReference != null)
{
stepExceptionHelp = 2;
object target = ee.TargetReference.Target;
if (target != null)
{
stepExceptionHelp = 3;
ee.TargetMethod.Invoke(target, parameters);
}
else
{
needsCleanup = true;
}
}
else
{
stepExceptionHelp = 4;
ee.TargetMethod.Invoke(null, parameters);
}
}
if (needsCleanup)
{
stepExceptionHelp = 5;
RemoveDeadEntries();
}
stepExceptionHelp = 6;
}
catch (Exception ex)
{
string appName = Assembly.GetEntryAssembly().GetName().Name;
if (!EventLog.SourceExists(appName))
{
EventLog.CreateEventSource(appName, "Application");
EventLog.WriteEntry(appName,
String.Format("Exception happen in 'SmartWeakEvent.Raise()': {0}. Stack: {1}. Additional int: {2}.", ex.Message, ex.StackTrace, stepExceptionHelp), EventLogEntryType.Error);
}
throw;
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;
using System.Xml.Serialization;
using HQ.Util.General.Log;
using HQ.Util.General.WeakEvent;
using JetBrains.Annotations;
// using System.Windows.Forms;
// using Microsoft.CSharp.RuntimeBinder;
// ATTENTION: Can only be used with Framework 4.0 and up
namespace HQ.Util.General.Notification
{
[Serializable]
public class NotifyPropertyChangedThreadSafeAsyncWeakBase : INotifyPropertyChanged
{
// ******************************************************************
[XmlIgnore]
[field: NonSerialized]
public SmartWeakEvent<PropertyChangedEventHandler> SmartPropertyChanged = new SmartWeakEvent<PropertyChangedEventHandler>();
[XmlIgnore]
[field: NonSerialized]
private Dispatcher _dispatcher = null;
// ******************************************************************
public event PropertyChangedEventHandler PropertyChanged
{
add
{
SmartPropertyChanged.Add(value);
}
remove
{
SmartPropertyChanged.Remove(value);
}
}
// ******************************************************************
[Browsable(false)]
[XmlIgnore]
public Dispatcher Dispatcher
{
get
{
if (_dispatcher == null)
{
_dispatcher = Application.Current?.Dispatcher;
if (_dispatcher == null)
{
if (Application.Current?.MainWindow != null)
{
_dispatcher = Application.Current.MainWindow.Dispatcher;
}
}
}
return _dispatcher;
}
set
{
if (_dispatcher == null && _dispatcher != value)
{
Debug.Print("Dispatcher has changed??? ");
}
_dispatcher = value;
}
}
// ******************************************************************
[NotifyPropertyChangedInvocator]
protected void NotifyPropertyChanged([CallerMemberName] String propertyName = null)
{
try
{
if (Dispatcher == null || Dispatcher.CheckAccess()) // Can be null in case of Console app
{
SmartPropertyChanged.Raise(this, new PropertyChangedEventArgs(propertyName));
}
else
{
Dispatcher.BeginInvoke(
new Action(() => SmartPropertyChanged.Raise(this, new PropertyChangedEventArgs(propertyName))));
}
}
catch (TaskCanceledException ex) // Prevent MT error when closing app...
{
Log.Log.Instance.AddEntry(LogType.LogException, "An exception occured when trying to notify.", ex);
}
}
// ******************************************************************
[NotifyPropertyChangedInvocator]
protected void NotifyPropertyChanged<T2>(Expression<Func<T2>> propAccess)
{
try
{
var asMember = propAccess.Body as MemberExpression;
if (asMember == null)
return;
string propertyName = asMember.Member.Name;
if (Dispatcher == null || Dispatcher.CheckAccess()) // Can be null in case of Console app
{
SmartPropertyChanged.Raise(this, new PropertyChangedEventArgs(propertyName));
}
else
{
Dispatcher.BeginInvoke(new Action(() => SmartPropertyChanged.Raise(this, new PropertyChangedEventArgs(propertyName))));
}
}
catch (TaskCanceledException ex) // Prevent MT error when closing app...
{
Log.Log.Instance.AddEntry(LogType.LogException, "An exception occured when trying to notify.", ex);
}
}
// ******************************************************************
protected bool UpdateField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
{
if (!EqualityComparer<T>.Default.Equals(field, value))
{
field = value;
NotifyPropertyChanged(propertyName);
return true;
}
return false;
}
// ******************************************************************
}
}
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;
using HQ.Util.General.Notification;
namespace HQ.Util.General
{
/// <summary>
/// This is the centralized calss to obtain the Dispatcher in order to make sure to get the appropriate one (the MainWindow dispatcher).
/// If you need a specidifc thread dispatcher, please refer to System.Windows.Threading.Dispatcher or Dispatcher.CurrentDispatcher.
/// This dispatcher should be set at the initialization (start) of any GUI executable: ex: Global.Instance.Dispatcher = Application.Current.Dispatcher;
/// </summary>
public class Global : NotifyPropertyChangedThreadSafeAsyncWeakBase
{
public delegate void IsBusyChangeHandler(bool isBusy);
/// <summary>
/// This event happen only the UI thread in low priority
/// </summary>
public event IsBusyChangeHandler IsBusyChange;
private readonly ConcurrentStack<bool> _stackBusy = new ConcurrentStack<bool>();
// ******************************************************************
public static void Init(Dispatcher dispatcher)
{
Instance.Dispatcher = dispatcher;
}
// ******************************************************************
public static Global Instance = new Global();
// ******************************************************************
private Global()
{
_busyLifeTrackerStack = new LifeTrackerStack(() => PushState(), PullState);
}
// ******************************************************************
/// <summary>
/// Will set busy state temporary until object is disposed where
/// the state will be back to its previous state.
/// </summary>
/// <param name="isBusy"></param>
/// <returns></returns>
public LifeTracker GetDisposableBusyState(bool isBusy = true)
{
return new LifeTracker(() => PushState(isBusy), PullState);
}
// ******************************************************************
private bool _isBusy;
/// <summary>
/// This property should be use by the GUI part in order to control the mouse cursor
/// </summary>
public bool IsBusy
{
get => _isBusy;
private set
{
if (value == _isBusy) return;
_isBusy = value;
Dispatcher.BeginInvoke(new Action(() => IsBusyChange?.Invoke(_isBusy)), DispatcherPriority.ContextIdle);
NotifyPropertyChanged();
}
}
private readonly object _objLockBusyStateChange = new object();
// ******************************************************************
/// <summary>
/// Always prefer usage of "Using(Global.Instance.GetDisposableBusyState())" whenever possible.
/// Otherwise ensure to call Pull State to get back previous state of the cursor when action is
/// completed
/// </summary>
/// <param name="isBusy"></param>
public void PushState(bool isBusy = true)
{
lock (_objLockBusyStateChange)
{
_stackBusy.Push(isBusy);
IsBusy = isBusy;
}
}
// ******************************************************************
public void PullState()
{
lock (_objLockBusyStateChange)
{
_stackBusy.TryPop(out bool isBusy);
if (_stackBusy.TryPeek(out isBusy))
{
IsBusy = isBusy;
}
else
{
IsBusy = false;
}
}
}
// ******************************************************************
private readonly LifeTrackerStack _busyLifeTrackerStack = null;
/// <summary>
/// Only kept for historical reason / compatibility with previous code
/// </summary>
[Obsolete("Use direct 'using(Gloabl.Instance.GetDisposableBusyState(isBusy))' which is simpler")]
public LifeTrackerStack BusyLifeTrackerStack
{
get { return _busyLifeTrackerStack; }
}
// ******************************************************************
// private int _latestVersionExecuted = 0;
private int _currentVersionRequired = 0;
private readonly object _objLockRunOnce = new object();
private readonly Dictionary<int, GlobalRunOncePerQueueData> _actionsToRunOncePerQueue =
new Dictionary<int, GlobalRunOncePerQueueData>();
private readonly int _countOfRequestInQueue = 0;
/// <summary>
/// It will record all action once per key and it
/// once per Dispatcher queue roll over (on ContextIdle).
/// When the dispatcher reach the DispatcherPriority.ContextIdle, it will
/// run all action once.
/// Thread safe... no action will be lost but can be run twice or more if
/// some are added by other thread(s) at the same time one is executed.
/// </summary>
/// EO: sorry for the name but it is the best found
/// <param name="key"></param>
/// <param name="action"></param>
public void RunOncePerQueueRollOnDispatcherThread(int key, Action action)
{
lock (_objLockRunOnce)
{
if (!_actionsToRunOncePerQueue.TryGetValue(key, out GlobalRunOncePerQueueData data))
{
data = new GlobalRunOncePerQueueData(action);
_actionsToRunOncePerQueue.Add(key, data);
}
_currentVersionRequired++;
data.VersionRequired = _currentVersionRequired;
}
if (_countOfRequestInQueue <= 1)
{
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.ContextIdle, new Action(ExecuteActions));
}
}
// ******************************************************************
private void ExecuteActions()
{
int versionExecute;
List<GlobalRunOncePerQueueData> datas = null;
lock (_objLockRunOnce)
{
versionExecute = _currentVersionRequired;
datas = _actionsToRunOncePerQueue.Values.ToList();
}
foreach (var data in datas)
{
data.Action();
}
lock (_objLockRunOnce)
{
List<int> keysToRemove = new List<int>();
foreach (var kvp in _actionsToRunOncePerQueue)
{
if (kvp.Value.VersionRequired <= versionExecute)
{
keysToRemove.Add(kvp.Key);
}
}
keysToRemove.ForEach(k => _actionsToRunOncePerQueue.Remove(k));
if (_actionsToRunOncePerQueue.Count == 0)
{
// _latestVersionExecuted = 0;
_currentVersionRequired = 0;
}
else
{
// _latestVersionExecuted = versionExecute;
}
}
}
// ******************************************************************
}
}
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Windows.Threading;
using HQ.Util.General;
using HQ.Util.General.Notification;
using Microsoft.VisualBasic.Devices;
using System.Windows;
using Mouse = System.Windows.Input.Mouse;
using System.Threading;
namespace HQ.Wpf.Util
{
public class AppGlobal
{
// ******************************************************************
public static void Init(Dispatcher dispatcher)
{
if (System.Windows.Input.Keyboard.IsKeyDown(Key.LeftShift) || System.Windows.Input.Keyboard.IsKeyDown(Key.RightShift))
{
var res = MessageBox.Show($"'{AppInfo.AppName}' has been started with shift pressed. Do you want to wait for the debugger (1 minute wait)?", "Confirmation", MessageBoxButton.YesNo,
MessageBoxImage.Exclamation, MessageBoxResult.No);
if (res == MessageBoxResult.Yes)
{
var start = DateTime.Now;
while (!Debugger.IsAttached)
{
if ((DateTime.Now - start).TotalSeconds > 60)
{
break;
}
Thread.Sleep(100);
}
}
}
if (dispatcher == null)
{
throw new ArgumentNullException();
}
Global.Init(dispatcher);
Instance.Init();
}
// ******************************************************************
public static readonly AppGlobal Instance = new AppGlobal();
// ******************************************************************
private AppGlobal()
{
}
// ******************************************************************
private void Init()
{
Global.Instance.PropertyChanged += AppGlobalPropertyChanged;
}
// ******************************************************************
void AppGlobalPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "IsBusy")
{
if (Global.Instance.IsBusy)
{
if (Global.Instance.Dispatcher.CheckAccess())
{
Mouse.OverrideCursor = Cursors.Wait;
}
else
{
Global.Instance.Dispatcher.BeginInvoke(new Action(() => Mouse.OverrideCursor = Cursors.Wait));
}
}
else
{
if (Global.Instance.Dispatcher.CheckAccess())
{
Mouse.OverrideCursor = Cursors.Arrow;
}
else
{
Global.Instance.Dispatcher.BeginInvoke(new Action(() => Mouse.OverrideCursor = Cursors.Arrow));
}
}
}
}
// ******************************************************************
}
}
using HQ.Util.General;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace HQ.Wpf.Util
{
/// <summary>
/// Ensure window cursor is "normal" (arrow) when visible.
/// Usage: In Window class, define a member: OverrideCursorMtForWindow. Instantiate in constructor after Initialisation.
/// </summary>
public class WindowWithAutoBusyState
{
// ******************************************************************
Window _window;
bool _nextStateShoulBeVisible = true;
// ******************************************************************
public WindowWithAutoBusyState()
{
}
// ******************************************************************
public void Init(Window window)
{
_window = window;
_window.Cursor = Cursors.Wait;
_window.Loaded += (object sender, RoutedEventArgs e) => _window.Cursor = Cursors.Arrow;
_window.IsVisibleChanged += WindowIsVisibleChanged;
_window.Closed += WindowClosed;
}
// ******************************************************************
private void WindowIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
if (_window.IsVisible)
{
if (_nextStateShoulBeVisible)
{
Global.Instance.PushState(false);
_nextStateShoulBeVisible = false;
}
}
else
{
if (!_nextStateShoulBeVisible)
{
Global.Instance.PullState();
_nextStateShoulBeVisible = true;
}
}
}
// ******************************************************************
private void WindowClosed(object sender, EventArgs e)
{
if (!_nextStateShoulBeVisible)
{
Global.Instance.PullState();
_nextStateShoulBeVisible = true;
}
}
// ******************************************************************
}
}