Created
June 17, 2013 03:48
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เราจะเช็คได้อย่างไรว่าผู้ใช้หยุดเปลี่ยนค่า XAML slider แล้ว
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<Page | |
x:Class="WinAppThai_SliderEvent.MainPage" | |
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | |
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | |
xmlns:local="using:WinAppThai_SliderEvent" | |
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" | |
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" | |
mc:Ignorable="d"> | |
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> | |
<StackPanel> | |
<Slider x:Name="slider" ValueChanged="Slider_ValueChanged"/> | |
<TextBlock x:Name="textBlock"/> | |
</StackPanel> | |
</Grid> | |
</Page> |
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using System; | |
using System.Collections.Generic; | |
using System.Diagnostics; | |
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 WinAppThai_SliderEvent | |
{ | |
/// <summary> | |
/// An empty page that can be used on its own or navigated to within a Frame. | |
/// </summary> | |
public sealed partial class MainPage : Page | |
{ | |
public MainPage() | |
{ | |
this.InitializeComponent(); | |
} | |
private DispatcherTimer _timer = null; | |
private void Slider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e) | |
{ | |
Debug.WriteLine("Slider_ValueChanged"); | |
// ถ้าเราสร้าง timer ไปแล้ว แสดงว่าผู้ใช้ยังเลื่อนอยู่ | |
// เราจะหยุด timer นั้น | |
if (_timer != null) | |
_timer.Stop(); | |
// เราสร้าง timer ใหม่ทุกครั้ง | |
_timer = new DispatcherTimer(); | |
// เราจะเช็คว่าภายในหนึ่งวินาทีผู้ใช้หยุดเลื่อนแล้วหรือยัง | |
_timer.Interval = new TimeSpan(0, 0, 1); | |
// เรากำหนดตรงนี้ว่าถ้าหนึ่งวินาทีผ่านไปแล้ว timer ตัวนี้ยังอยู่ก็แสดงว่าผู้ใช้หยุดแล้ว | |
// ให้ update textBlock ได้ | |
_timer.Tick += updateTextBlock; | |
// เริ่ม timer | |
_timer.Start(); | |
} | |
void updateTextBlock(object sender, object e) | |
{ | |
Debug.WriteLine("updateTextBlock"); | |
var i = slider.Value; | |
textBlock.Text = i.ToString(); | |
// อย่าลืม หยุด และลบ event | |
_timer.Stop(); | |
_timer.Tick -= updateTextBlock; | |
} | |
} | |
} |
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