[UWP] [C＃]尝试在UWP中每次在屏幕上写入和删除文本 [英] [UWP][C#]Trying to write and erase the text every time on my screen in UWP

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本文介绍了[UWP] [C＃]尝试在UWP中每次在屏幕上写入和删除文本的处理方法，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

我正在尝试编写和删除文本每次都在我的屏幕上uwp，但它只能在第一次工作之后，我既不能在屏幕上写，也不能
i可以擦除我写的东西。而且颜色选择器在选择颜色后没有消失

Xaml代码 

<Page xmlns:my="using:Coding4Fun.Toolkit.Controls" 
    x:Class="ABCD_kids.WorkBook"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:ABCD_kids"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     
    mc:Ignorable="d">

    <Grid>
        <Grid.Background>
            <ImageBrush Stretch="Fill" ImageSource="ms-appx:///ABCD/Workbook_bg.png"/>
        </Grid.Background>
        <!--<InkCanvas Name="ink"/>-->
        <RelativePanel x:Name="HomePanel" Grid.Row="0" Canvas.ZIndex="1">
            <Image x:Name="Home" Source="ABCD/Home.png"
               RelativePanel.AlignLeftWithPanel="True"
                   Margin="10,10,0,0" Tapped="HomePage"
               Width="40" Height="40"/>
            <Rectangle x:Name="Bg_Rect" Fill="White"
                       Width="310" Height="80"
                       RelativePanel.AlignHorizontalCenterWithPanel="True"
                       Margin="0,52,0,0"/>
            <Image x:Name="Alph_cap" Source="ABCD/Cap_alpha/Cap_0.png"
               RelativePanel.AlignLeftWithPanel="True" 
                   RelativePanel.Below="Home"
                   Margin="60,-9,0,0"
               Width="100" Height="100"/>
            <TextBlock x:Name="CapAlphaName"                
                Text="Ant"
                FontFamily="Font/VAG Round.TTF#VAG Round"
               RelativePanel.AlignTopWithPanel="True"
               RelativePanel.RightOf="Alph_cap"
               Foreground="BlueViolet"
               Margin="10,70,0,0" FontSize="39" FontStretch="UltraCondensed">
            </TextBlock>
            <Grid x:Name="Bg_BigRect" Background="White"
                       Width="310" Height="440"
                       RelativePanel.Below="Bg_Rect"
                       Margin="24,10,0,0">
                <Image x:Name="Trans_Tex" Source="WorkBook/T0.png"                              
               Margin="-10,0,0,20" 
               Width="310" Height="370"/>
                <InkCanvas x:Name="ink"/>
            </Grid>
            <Image x:Name="WPrev" Source="ABCD/Previous.png"
               RelativePanel.AlignBottomWithPanel="True"                   
                Margin="49,0,0,10" Tapped="WPrevTap"
               Width="40" Height="40"/>
            <my:ColorPicker x:Name="W_Paints"
                            Margin="216,203,-6,0" Height="374"
                            Width="374" VerticalAlignment="Top"
                            HorizontalAlignment="Left"
                            Visibility="Collapsed"
                            ColorChanged="CPtest_ColorChanged"/>           
            <!--<controls:ColorPicker x:Name="W_Paints"
                            Margin="216,203,-6,0" Height="40"
                            Width="40" VerticalAlignment="Top"
                            HorizontalAlignment="Left"></controls:ColorPicker>-->

            <Image x:Name="W_Paint" Source="ABCD/W_Paint.png"
               RelativePanel.AlignBottomWithPanel="True"
                   RelativePanel.RightOf="WPrev"
                   Margin="17,0,0,10" Tapped="W_Paintt"
               Width="40" Height="40">

            </Image>
            <Image x:Name="W_Clear" Source="ABCD/Clear_all.png"
               RelativePanel.AlignBottomWithPanel="True"
                   RelativePanel.RightOf="W_Paint" Tapped="W_ClearTap"
                   Margin="17,0,0,10"
               Width="40" Height="40"/>
            <Image x:Name="W_Mactive" Source="ABCD/Music_active.png"
               RelativePanel.AlignBottomWithPanel="True"
                   RelativePanel.RightOf="W_Clear"
                   Margin="17,0,0,10" Tapped="W_MactiveTap"
               Width="40" Height="40"/>
            <Image x:Name="W_Fwd" Source="ABCD/Forward.png"
               RelativePanel.AlignBottomWithPanel="True"
                   RelativePanel.RightOf="W_Mactive"
                   Margin="17,0,0,10" Tapped="W_FwdTap"
               Width="40" Height="40"/>

        </RelativePanel>
        <MediaElement x:Name="mediaWorkbook" Source="/Video/workbook.mp3" Volume="0.4"  />
    </Grid>
</Page>

c＃c​​ode 

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Input.Inking;
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.Media.Imaging;
using Windows.UI.Xaml.Navigation;


// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace ABCD_kids
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class WorkBook : Page
    {

        public WorkBook()
        {
            this.InitializeComponent();
            ink.InkPresenter.InputDeviceTypes = CoreInputDeviceTypes.Mouse | CoreInputDeviceTypes.Touch;     

            // Set initial ink stroke attributes.
            InkDrawingAttributes drawingAttributes = new InkDrawingAttributes();
            drawingAttributes.Color = Windows.UI.Colors.Black;
            drawingAttributes.IgnorePressure = false;
            drawingAttributes.FitToCurve = true;
            ink.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);

        }


        string[] CapsAlpha = new string[] { "Ant", "ant", "Bear", "bear", "Cat", "cat", "Dog", "dog", "Elephant", "elephant", "Frog", "frog", "Giraffe", "giraffe", "Hippo", "hippo", "Ice-Cream", "ice-cream", "Jellyfish", "jellyfish", "Kite", "kite", "Lion", "lion", "Mouse", "mouse", "Nest", "nest", "Owl", "owl",
            "Parrot", "parrot", "Queen", "queen", "Rabbit", "rabbit", "Sheep", "sheep", "Toy", "toy", "Umbrella", "umbrella", "Vulture", "vulture", "Watch", "watch", "X-ray", "x-ray", "Yak", "yak", "Zebra", "zebra" };                     
        int currentIndex = 0;
        private void WPrevTap(object sender, TappedRoutedEventArgs e)
        {
            currentIndex--;
            if (currentIndex < 0)
            {
                currentIndex = 0;
                return;
            }

            Trans_Tex.Source = new BitmapImage(new Uri("ms-appx:///WorkBook/T" + currentIndex + ".png"));
            Alph_cap.Source = new BitmapImage(new Uri("ms-appx:///ABCD/MixCapSmall/CS" + currentIndex + ".png"));
            CapAlphaName.Text = CapsAlpha[currentIndex];
            //var speechText = this.CapAlphaName.Text;            
        }

        private void W_FwdTap(object sender, TappedRoutedEventArgs e)
        {
            currentIndex++;
            if (currentIndex > 51)
            {
                currentIndex = 25;
                return;
            }
            Trans_Tex.Source = new BitmapImage(new Uri("ms-appx:///WorkBook/T" + currentIndex + ".png"));
            Alph_cap.Source = new BitmapImage(new Uri("ms-appx:///ABCD/MixCapSmall/CS" + currentIndex + ".png"));            
            CapAlphaName.Text = CapsAlpha[currentIndex];           

            }

        private void W_MactiveTap(object sender, TappedRoutedEventArgs e)
        {
            if ((W_Mactive.Source as BitmapImage).UriSource == new Uri("ms-appx:///ABCD/Music_active.png", UriKind.Absolute))
            {
                W_Mactive.Source = new BitmapImage(new Uri("ms-appx:///ABCD/Music_mute.png"));
                mediaWorkbook.Stop();
            }
            else
            {
                W_Mactive.Source = new BitmapImage(new Uri("ms-appx:///ABCD/Music_active.png"));
                mediaWorkbook.Play();
            }
        }


         private void W_Paintt(object sender, TappedRoutedEventArgs e)
        {
            W_Paints.Visibility = Visibility;
        }
        private void CPtest_ColorChanged(object sender, Windows.UI.Color color)
        {
            ink.InkPresenter.InputDeviceTypes = CoreInputDeviceTypes.Mouse | CoreInputDeviceTypes.Touch;

            // Set initial ink stroke attributes.
            InkDrawingAttributes drawingAttributes = new InkDrawingAttributes();
            drawingAttributes.Color = color;
            drawingAttributes.IgnorePressure = false;
            drawingAttributes.FitToCurve = true;
            ink.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);

            //Bg_BigRect.Background = new SolidColorBrush(color);
        }

        private void W_ClearTap(object sender, TappedRoutedEventArgs e)
        {
            this.ink.InkPresenter.InputProcessingConfiguration.Mode = InkInputProcessingMode.Erasing;
            //ink.InkPresenter.Strokes.Clear();
            //Windows.UI.Input.Inking.InkInputProcessingMode.Erasing;
            //this.ink.Strokes.Remove();
        }



        private void HomePage(object sender, TappedRoutedEventArgs e)
        {
            this.Frame.Navigate(typeof(MainPage));
        }


    }
}

参考图片：

推荐答案

您好pariwesh，

Hi pariwesh,

>> 我每次都在尝试编写和删除文本我的屏幕在uwp，但它只能在第一次工作之后，我不能在屏幕上写
，也不能删除我写的 

>>I'm trying to write and erase the text every time on my screen in uwp but it works only for the first time after that neither i can write on screen and neither i can erase what i have written 

第一次 InkPresenter.Inp utProcessingConfiguration.Mode
是 InkInputProcessingMode.Inking ，因此您可以在屏幕上书写，然后点按
W_Clear 图片并触发了 W_ClearTap 事件，您已将&strong; InkInputProcessingMode
更改为 this.ink.InkPresenter.InputProcessingConfiguration.Mode = InkInputProcessingMode.Erasing ，以这种方式
你可以擦除。如果您想再次写入，则应将
InkInputProcessingMode 更改为着墨 或无。有关详细信息，您可以参考
InkInputProcessingMode 。

At the first time InkPresenter.InputProcessingConfiguration.Mode is InkInputProcessingMode.Inking, so you can write on the screen, after that when you tapped the W_Clear image and triggered the W_ClearTap event, you have changed the InkInputProcessingMode to this.ink.InkPresenter.InputProcessingConfiguration.Mode = InkInputProcessingMode.Erasing, in this way you can just erase. If you want to write again, you should change the InkInputProcessingMode to Inking or none. For details, you can refer to the InkInputProcessingMode.

>> 选择颜色后颜色选择器也不会消失

在 W_Paint 图像中 W_Paintt 分享事件处理程序，您有代码
W_Paints.Visibility = Visibility，您可以将Visibility属性设置为
W_Paints.Visibility选择颜色后，= Visibility.Collapsed 。

In your W_Paint image’s W_Paintt tapped event handler, you have the code W_Paints.Visibility = Visibility, you can set the Visibility property to W_Paints.Visibility = Visibility.Collapsed after you have selected a color.


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