检测鼠标按钮在特定时间段内按住特定元素的最佳方法是什么？
答案 0 :(得分：12)
感谢您提示，我已经建立了附加属性以避免任何代码隐藏：
using System;
using System.Windows;
using System.Windows.Threading;
/// <summary>
/// Represents a particular mouse button being pressed
/// </summary>
public enum MouseButtonType
{
/// <summary>
/// Default selection
/// </summary>
None,
/// <summary>
/// Left mouse button
/// </summary>
Left,
/// <summary>
/// Right mouse button
/// </summary>
Right,
/// <summary>
/// Either mouse button
/// </summary>
Both
}
/// <summary>
/// Provides functionality for detecting when a mouse button has been held
/// </summary>
public class MouseDownWait
{
/// <summary>
/// States which mouse button press should be detected
/// </summary>
public static readonly DependencyProperty MouseButtonProperty =
DependencyProperty.RegisterAttached(
"MouseButton",
typeof(MouseButtonType),
typeof(MouseDownWait),
new PropertyMetadata(
(o, e) =>
{
var ctrl = o as UIElement;
if (ctrl != null)
{
new MouseDownWait(ctrl);
}
}));
/// <summary>
/// The time (in milliseconds) to wait before detecting mouse press
/// </summary>
public static readonly DependencyProperty TimeProperty = DependencyProperty.RegisterAttached(
"Time", typeof(int), typeof(MouseDownWait), new FrameworkPropertyMetadata(0, OnTimePropertyChanged));
/// <summary>
/// Method to be called when the mouse press is detected
/// </summary>
public static readonly DependencyProperty DetectMethodProperty =
DependencyProperty.RegisterAttached(
"DetectMethod",
typeof(string),
typeof(MouseDownWait));
/// <summary>
/// Target object for the method calls (if not the datacontext)
/// </summary>
public static readonly DependencyProperty MethodTargetProperty =
DependencyProperty.RegisterAttached("MethodTarget", typeof(object), typeof(MouseDownWait));
/// <summary>
/// The timer used to detect mouse button holds
/// </summary>
private static readonly DispatcherTimer Timer = new DispatcherTimer();
/// <summary>
/// The element containing the attached property
/// </summary>
private readonly UIElement element;
/// <summary>
/// Initializes a new instance of the <see cref="MouseDownWait"/> class.
/// </summary>
/// <param name="element">The element.</param>
public MouseDownWait(UIElement element)
{
this.element = element;
if (this.element == null)
{
return;
}
this.element.MouseLeftButtonDown += ElementMouseLeftButtonDown;
this.element.MouseLeftButtonUp += ElementMouseLeftButtonUp;
this.element.MouseRightButtonDown += ElementMouseRightButtonDown;
this.element.MouseRightButtonUp += ElementMouseRightButtonUp;
this.element.MouseDown += ElementMouseDown;
this.element.MouseUp += ElementMouseUp;
Timer.Tick += this.TimerTick;
}
/// <summary>
/// Gets the mouse button type
/// </summary>
/// <param name="element">The element.</param>
/// <returns>
/// The mouse button type
/// </returns>
public static MouseButtonType GetMouseButton(UIElement element)
{
return (MouseButtonType)element.GetValue(MouseButtonProperty);
}
/// <summary>
/// Sets the mouse button type
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">The type of mouse button</param>
public static void SetMouseButton(UIElement element, MouseButtonType value)
{
element.SetValue(MouseButtonProperty, value);
}
/// <summary>
/// Gets the time.
/// </summary>
/// <param name="element">The element.</param>
/// <returns>The time in milliseconds</returns>
public static int GetTime(UIElement element)
{
return (int)element.GetValue(TimeProperty);
}
/// <summary>
/// Sets the time.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">The value.</param>
public static void SetTime(UIElement element, int value)
{
element.SetValue(TimeProperty, value);
}
/// <summary>
/// Sets the detect method
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">The value.</param>
public static void SetDetectMethod(UIElement element, string value)
{
element.SetValue(DetectMethodProperty, value);
}
/// <summary>
/// Gets the detect method
/// </summary>
/// <param name="element">The element.</param>
/// <returns>method name</returns>
public static string GetDetectMethod(UIElement element)
{
return (string)element.GetValue(DetectMethodProperty);
}
/// <summary>
/// Gets the method target.
/// </summary>
/// <param name="ctrl">The CTRL .</param>
/// <returns>method target (i.e. viewmodel)</returns>
public static object GetMethodTarget(UIElement ctrl)
{
var result = ctrl.GetValue(MethodTargetProperty);
if (result == null)
{
var fe = ctrl as FrameworkElement;
if (fe != null)
{
result = fe.DataContext;
}
}
return result;
}
/// <summary>
/// Sets the method target.
/// </summary>
/// <param name="ctrl">The CTRL .</param>
/// <param name="value">The value.</param>
public static void SetMethodTarget(UIElement ctrl, object value)
{
ctrl.SetValue(MethodTargetProperty, value);
}
/// <summary>
/// Called when the time property changes.
/// </summary>
/// <param name="d">The dependency object.</param>
/// <param name="e">The <see cref="System.Windows.DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
private static void OnTimePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Timer.Interval = TimeSpan.FromMilliseconds((int)e.NewValue);
}
/// <summary>
/// Called when a mouse down is detected
/// </summary>
private static void MouseDownDetected()
{
Timer.Start();
}
/// <summary>
/// Called when a mouse up is detected
/// </summary>
private static void MouseUpDetected()
{
Timer.Stop();
}
/// <summary>
/// Checks if the mouse button has been detected.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="type">The mouse button type.</param>
/// <param name="mouseDown">if set to <c>true</c> [mouse down].</param>
private static void CheckMouseDetected(object sender, MouseButtonType type, bool mouseDown)
{
var uiElement = sender as UIElement;
if (uiElement == null)
{
return;
}
if (GetMouseButton(uiElement) != type)
{
return;
}
if (mouseDown)
{
MouseDownDetected();
}
else
{
MouseUpDetected();
}
}
/// <summary>
/// Called when the mouse down event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Both, true);
}
/// <summary>
/// Called when the mouse up event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Both, false);
}
/// <summary>
/// Called when the left mouse down event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Left, true);
}
/// <summary>
/// Called when the left mouse up event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Left, false);
}
/// <summary>
/// Called when the right mouse down event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseRightButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Right, true);
}
/// <summary>
/// Called when the right mouse up event fires
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.Input.MouseButtonEventArgs"/> instance containing the event data.</param>
private static void ElementMouseRightButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
CheckMouseDetected(sender, MouseButtonType.Right, false);
}
/// <summary>
/// Called on each timer tick
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private void TimerTick(object sender, EventArgs e)
{
Timer.Stop();
var method = GetDetectMethod(this.element);
if (!string.IsNullOrEmpty(method))
{
this.InvokeMethod(method);
}
}
/// <summary>
/// Invokes the method.
/// </summary>
/// <param name="methodName">Name of the method.</param>
/// <param name="parameters">The parameters.</param>
private void InvokeMethod(string methodName, params object[] parameters)
{
var target = GetMethodTarget(this.element);
var targetMethod = target.GetType().GetMethod(methodName);
if (targetMethod == null)
{
throw new MissingMethodException(methodName);
}
targetMethod.Invoke(target, parameters);
}
}
用法：
<Border BorderBrush="Gray" BorderThickness="1" Height="200" Width="200" Background="Transparent"
local:MouseDownWait.MouseButton="Both"
local:MouseDownWait.Time="1000"
local:MouseDownWait.DetectMethod="MouseDetected">
<TextBlock x:Name="Title" HorizontalAlignment="Stretch" VerticalAlignment="Center" TextAlignment="Center" FontSize="28" />
</Border>
当指定的时间已经过去时，这将调用DataContext（ViewModel）上的方法。您可以检测鼠标左键，右键或两键。
答案 1 :(得分：9)
您需要向对象添加MouseDown和MouseUp处理程序。在MouseDown记录DateTime.Now中。如果在MouseUp处理程序中：
DateTime.Now.Subtract(clickTime).TotalSeconds > your_seconds_value
然后点击新活动MouseClickedForXseconds。
如果您不想等待鼠标按下事件，则需要使用MouseDown方法启动计时器，以触发MouseClickedForXSeconds事件。此计时器将被鼠标注册事件取消。