处理二，三，四指轻扫手势在WinRT的应用 [英] Handling Two, Three, Four Fingers Swipe Gestures in WinRT App
本文介绍了处理二，三，四指轻扫手势在WinRT的应用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下代码：
private Point initialpoint;
private void ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)
{
initialpoint = e.Position;
}
private void ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
Point currentpoint = e.Position;
if (currentpoint.X - initialpoint.X >= 100)
{
System.Diagnostics.Debug.WriteLine("Swipe Right");
e.Complete();
}
}
我可以处理1指轻扫手势很容易，但我想处理2，3，4指滑动手势也。谁能告诉我该怎么做。
I can handle 1 finger swipe gesture very easily, but I want to handle 2, 3, 4 fingers swipe gestures also. Can anyone tell me how to do that?
推荐答案
根据这个的MSDN论坛发帖你需要使用的指针通知。与文档的工作示例代码驻留在 MSDN库
According to this MSDN Forum Posting you will need to use pointer notifications. The documentation with working example code resides in the MSDN Library
从最后一个环节：
一个指针对象表示从输入设备一个单一的，独特的输入接点（一个PointerPoint）（诸如鼠标，笔/触笔，单个手指或多个手指）。系统将创建在首次检测到接触的指针和毁坏它，当指针离开（的出发）的检测范围或将被取消。在多个设备或多触摸输入的情况下，每一个接触被视为唯一的指针。
A pointer object represents a single, unique input "contact" (a PointerPoint) from an input device (such as a mouse, pen/stylus, single finger, or multiple fingers). The system creates a pointer when a contact is first detected and destroys it when the pointer leaves (departs) detection range or is canceled. In the case of multiple devices or multi-touch input, each contact is treated as a unique pointer.
只是一个警告，我没有多点触控的Windows 8设备来测试这个代码上。因此它与所有的它的局限性的Simuator了测试，并且如在上述链接中提到的Windows 8不会没有内置在手势支持用于检测必须使用较低级功能的多个手指。
Just a caveat, I do not have a multitouch Windows 8 device to test this code on. So it has been tested in the Simuator with all of its limitations, and as mentioned in the above links Windows 8 doesn't not have built in gesture support for detecting multiple fingers you have to use lower level functions.
首先我增加了两个字典的上述MSDN示例代码和两个变量为你刷卡阈值的类定义。
First of all I added two more dictionary's to the above MSDN example code and two variable for your Swipe Threshold to the Class definitions.
Dictionary<uint, Point> startLocation;
Dictionary<uint, bool> pointSwiped;
int swipeThresholdX = 100;
int swipeThresholdY = 100;
然后我初始化Dictionarys在窗体的构造
I then initialize the Dictionarys in the Form's Constructor
startLocation = new Dictionary<uint, Point>((int)SupportedContacts.Contacts);
pointSwiped = new Dictionary<uint, bool>((int)SupportedContacts.Contacts);
于是，原来的字典中加入或已经一个项目中删除我做的一样的每一个地方新字典的
Then every place that the Original Dictionary was added to or had an item removed I did the same with the new Dictionary's
补充：
startLocation[pt.PointerId] = pt.Position;
pointSwiped[pt.PointerId] = false;
删除：
removing:
startLocation.Remove(pt.PointerId);
pointSwiped.Remove(pt.PointerId);
后来终于把它们放在一起在PointerMovedEvent：
Then finally put them together in the PointerMovedEvent:
private void targetContainer_PointerMoved(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer);
if (currentPoint.IsInContact)
{
if (startLocation.ContainsKey(currentPoint.PointerId))
{
Point startPoint = startLocation[currentPoint.PointerId];
if (Math.Abs(currentPoint.Position.X - startPoint.X) > swipeThresholdX) // I only did one Axis for testing
{
pointSwiped[currentPoint.PointerId] = true;
}
}
}
updateInfoPop(e);
}
最后修改的MSDN示例：
Final Modified MSDN Example:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace PointerInput
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
Windows.Devices.Input.TouchCapabilities SupportedContacts = new Windows.Devices.Input.TouchCapabilities();
uint numActiveContacts;
Dictionary<uint, Windows.UI.Input.PointerPoint> contacts;
Dictionary<uint, Point> startLocation;
Dictionary<uint, bool> pointSwiped;
int swipeThresholdX = 100;
int swipeThresholdY = 100;
public MainPage()
{
this.InitializeComponent();
numActiveContacts = 0;
contacts = new Dictionary<uint, Windows.UI.Input.PointerPoint>((int)SupportedContacts.Contacts);
startLocation = new Dictionary<uint, Point>((int)SupportedContacts.Contacts);
pointSwiped = new Dictionary<uint, bool>((int)SupportedContacts.Contacts);
targetContainer.PointerPressed += new PointerEventHandler(targetContainer_PointerPressed);
targetContainer.PointerEntered += new PointerEventHandler(targetContainer_PointerEntered);
targetContainer.PointerReleased += new PointerEventHandler(targetContainer_PointerReleased);
targetContainer.PointerExited += new PointerEventHandler(targetContainer_PointerExited);
targetContainer.PointerCanceled += new PointerEventHandler(targetContainer_PointerCanceled);
targetContainer.PointerCaptureLost += new PointerEventHandler(targetContainer_PointerCaptureLost);
targetContainer.PointerMoved += new PointerEventHandler(targetContainer_PointerMoved);
}
// PointerPressed and PointerReleased events do not always occur in pairs.
// Your app should listen for and handle any event that might conclude a pointer down action
// (such as PointerExited, PointerCanceled, and PointerCaptureLost).
void targetContainer_PointerPressed(object sender, PointerRoutedEventArgs e)
{
if (Convert.ToBoolean(SupportedContacts.TouchPresent) && (numActiveContacts > SupportedContacts.Contacts))
{
// cannot support more contacts
eventLog.Text += "\nNumber of contacts exceeds the number supported by the device.";
return;
}
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nDown: " + pt.PointerId;
// Change background color of target when pointer contact detected.
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Green);
// Check if pointer already exists (if enter occurred prior to down).
if (contacts.ContainsKey(pt.PointerId))
{
return;
}
contacts[pt.PointerId] = pt;
startLocation[pt.PointerId] = pt.Position;
pointSwiped[pt.PointerId] = false;
++numActiveContacts;
e.Handled = true;
// Display pointer details.
createInfoPop(e);
}
private void targetContainer_PointerEntered(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nOver: " + pt.PointerId;
if (contacts.Count == 0)
{
// Change background color of target when pointer contact detected.
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Blue);
}
// Check if pointer already exists (if enter occurred prior to down).
if (contacts.ContainsKey(pt.PointerId))
{
return;
}
// Push new pointer Id onto expando target pointers array.
contacts[pt.PointerId] = pt;
startLocation[pt.PointerId] = pt.Position;
pointSwiped[pt.PointerId] = false;
++numActiveContacts;
e.Handled = true;
// Display pointer details.
createInfoPop(e);
}
// Fires for for various reasons, including:
// - User interactions
// - Programmatic caputre of another pointer
// - Captured pointer was deliberately released
// PointerCaptureLost can fire instead of PointerReleased.
private void targetContainer_PointerCaptureLost(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nPointer capture lost: " + pt.PointerId;
if (contacts.ContainsKey(pt.PointerId))
{
checkSwipe();
contacts[pt.PointerId] = null;
contacts.Remove(pt.PointerId);
startLocation.Remove(pt.PointerId);
if (pointSwiped.ContainsKey(pt.PointerId))
pointSwiped.Remove(pt.PointerId);
--numActiveContacts;
}
// Update the UI and pointer details.
foreach (TextBlock tb in pointerInfo.Children)
{
if (tb.Name == e.Pointer.PointerId.ToString())
{
pointerInfo.Children.Remove(tb);
}
}
if (contacts.Count == 0)
{
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Black);
}
e.Handled = true;
}
// Fires for for various reasons, including:
// - A touch contact is canceled by a pen coming into range of the surface.
// - The device doesn't report an active contact for more than 100ms.
// - The desktop is locked or the user logged off.
// - The number of simultaneous contacts exceeded the number supported by the device.
private void targetContainer_PointerCanceled(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nPointer canceled: " + pt.PointerId;
if (contacts.ContainsKey(pt.PointerId))
{
checkSwipe();
contacts[pt.PointerId] = null;
contacts.Remove(pt.PointerId);
startLocation.Remove(pt.PointerId);
if (pointSwiped.ContainsKey(pt.PointerId))
pointSwiped.Remove(pt.PointerId);
--numActiveContacts;
}
// Update the UI and pointer details.
foreach (TextBlock tb in pointerInfo.Children)
{
if (tb.Name == e.Pointer.PointerId.ToString())
{
pointerInfo.Children.Remove(tb);
}
}
if (contacts.Count == 0)
{
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Black);
}
e.Handled = true;
}
private void targetContainer_PointerExited(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nPointer exited: " + pt.PointerId;
if (contacts.ContainsKey(pt.PointerId))
{
checkSwipe();
contacts[pt.PointerId] = null;
contacts.Remove(pt.PointerId);
startLocation.Remove(pt.PointerId);
if (pointSwiped.ContainsKey(pt.PointerId))
pointSwiped.Remove(pt.PointerId);
--numActiveContacts;
}
// Update the UI and pointer details.
foreach (TextBlock tb in pointerInfo.Children)
{
if (tb.Name == e.Pointer.PointerId.ToString())
{
pointerInfo.Children.Remove(tb);
}
}
if (contacts.Count == 0)
{
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Gray);
}
e.Handled = true;
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
void targetContainer_PointerReleased(object sender, PointerRoutedEventArgs e)
{
foreach (TextBlock tb in pointerInfo.Children)
{
if (tb.Name == e.Pointer.PointerId.ToString())
{
pointerInfo.Children.Remove(tb);
}
}
Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer);
// Update event sequence.
eventLog.Text += "\nUp: " + pt.PointerId;
// Change background color of target when pointer contact detected.
targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Red);
if (contacts.ContainsKey(pt.PointerId))
{
checkSwipe();
contacts[pt.PointerId] = null;
contacts.Remove(pt.PointerId);
startLocation.Remove(pt.PointerId);
if(pointSwiped.ContainsKey(pt.PointerId))
pointSwiped.Remove(pt.PointerId);
--numActiveContacts;
}
e.Handled = true;
}
private void targetContainer_PointerMoved(object sender, PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer);
if (currentPoint.IsInContact)
{
if (startLocation.ContainsKey(currentPoint.PointerId))
{
Point startPoint = startLocation[currentPoint.PointerId];
if (Math.Abs(currentPoint.Position.X - startPoint.X) > swipeThresholdX) // I only did one Axis for testing
{
pointSwiped[currentPoint.PointerId] = true;
}
}
}
updateInfoPop(e);
}
int numberOfSwipedFingers()
{
int count = 0;
foreach (var item in pointSwiped)
{
if (item.Value) { count += 1; }
}
return count;
}
void checkSwipe()
{
int fingers = numberOfSwipedFingers();
if (fingers > 1)
{
eventLog.Text += "\nNumber of Swiped fingers = " + fingers;
}
else if (fingers == 1)
{
eventLog.Text += "\nNumber of Swiped fingers = " + fingers;
}
if(fingers > 0)
pointSwiped.Clear();
}
void createInfoPop(PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer);
TextBlock pointerDetails = new TextBlock();
pointerDetails.Name = currentPoint.PointerId.ToString();
pointerDetails.Foreground = new SolidColorBrush(Windows.UI.Colors.White);
pointerInfo.Children.Add(pointerDetails);
pointerDetails.Text = queryPointer(e);
}
void updateInfoPop(PointerRoutedEventArgs e)
{
foreach (TextBlock pointerDetails in pointerInfo.Children)
{
if (pointerDetails.Name == e.Pointer.PointerId.ToString())
{
pointerDetails.Text = queryPointer(e);
}
}
}
String queryPointer(PointerRoutedEventArgs e)
{
Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer);
String details = "";
switch (e.Pointer.PointerDeviceType)
{
case Windows.Devices.Input.PointerDeviceType.Mouse:
details += "\nPointer type: mouse";
break;
case Windows.Devices.Input.PointerDeviceType.Pen:
details += "\nPointer type: pen";
if (e.Pointer.IsInContact)
{
details += "\nPressure: " + currentPoint.Properties.Pressure;
details += "\nrotation: " + currentPoint.Properties.Orientation;
details += "\nTilt X: " + currentPoint.Properties.XTilt;
details += "\nTilt Y: " + currentPoint.Properties.YTilt;
details += "\nBarrel button pressed: " + currentPoint.Properties.IsBarrelButtonPressed;
}
break;
case Windows.Devices.Input.PointerDeviceType.Touch:
details += "\nPointer type: touch";
details += "\nrotation: " + currentPoint.Properties.Orientation;
details += "\nTilt X: " + currentPoint.Properties.XTilt;
details += "\nTilt Y: " + currentPoint.Properties.YTilt;
break;
default:
details += "\nPointer type: n/a";
break;
}
GeneralTransform gt = targetContainer.TransformToVisual(page);
Point screenPoint;
screenPoint = gt.TransformPoint(new Point(currentPoint.Position.X, currentPoint.Position.Y));
details += "\nPointer Id: " + currentPoint.PointerId.ToString() +
"\nPointer location (parent): " + currentPoint.Position.X + ", " + currentPoint.Position.Y +
"\nPointer location (screen): " + screenPoint.X + ", " + screenPoint.Y;
return details;
}
}
}
这篇关于处理二，三，四指轻扫手势在WinRT的应用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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