背水一战 Windows 10 (27) - 控件(文本类): TextBlock

2021-05-12 22:27

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标签:鼠标   颜色   change   ssi   显示不全   dir   stroke   字体   触摸   

原文:背水一战 Windows 10 (27) - 控件(文本类): TextBlock

[源码下载]


背水一战 Windows 10 (27) - 控件(文本类): TextBlock

作者:webabcd


介绍
背水一战 Windows 10 之 控件(文本类)

  • TextBlock

示例
1、TextBlock 的示例 1
Controls/TextControl/TextBlockDemo1.xaml

Page
    x:Class="Windows10.Controls.TextControl.TextBlockDemo1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.TextControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    Grid Background="Transparent">
        StackPanel Margin="10 0 10 10">

            
            TextBlock Text="i am a "TextBlock"" Margin="5"
                       Foreground="Blue" 
                       FontFamily="微软雅黑" 
                       FontSize="24" 
                       FontWeight="Bold" 
                       FontStyle="Italic"
                       FontStretch="Normal"
                       Padding="5" />


            
            TextBlock Text="i am a "TextBlock"" Margin="5" TextAlignment="Justify" />


            
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghijklmnopq www" Margin="5" TextWrapping="NoWrap" />
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghijklmnopq www" Margin="5" TextWrapping="Wrap" />
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghijklmnopq www" Margin="5" TextWrapping="WrapWholeWords" />



            
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghi jklmnopqrstuvwxyz" Margin="5" TextTrimming="None"/>
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghi jklmnopqrstuvwxyz" Margin="5" TextTrimming="Clip"/>
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghi jklmnopqrstuvwxyz" Margin="5" TextTrimming="WordEllipsis"/>
            TextBlock Width="100" HorizontalAlignment="Left" Text="abcdefghi jklmnopqrstuvwxyz" Margin="5" TextTrimming="CharacterEllipsis"/>


            
            TextBlock MaxLines="3" Margin="5">
                TextBlock.Inlines>
                    Run>111111Run>
                    LineBreak />
                    Run>222222Run>
                    LineBreak />
                    Run>333333Run>
                    LineBreak />
                    Run>444444Run>
                    LineBreak />
                    Run>555555Run>
                TextBlock.Inlines>
            TextBlock>


            
            TextBlock Margin="5" CharacterSpacing="100" LineStackingStrategy="MaxHeight" LineHeight="50">
                TextBlock.Inlines>
                    Run Foreground="Red">RunRun>
                    Span Foreground="Blue">SpanSpan>
                    LineBreak />
                    Bold>BoldBold>
                    Italic>ItalicItalic>
                    Underline>UnderlineUnderline>
                TextBlock.Inlines>
            TextBlock>


            
            Grid Background="Red" Margin="5">
                TextBlock Text="Aj" FontSize="24" TextLineBounds="Full" />
            Grid>
            Grid Background="Red" Margin="5">
                TextBlock Text="Aj" FontSize="24" TextLineBounds="TrimToCapHeight" />
            Grid>
            Grid Background="Red" Margin="5">
                TextBlock Text="Aj" FontSize="24" TextLineBounds="TrimToBaseline" />
            Grid>
            Grid Background="Red" Margin="5">
                TextBlock Text="Aj" FontSize="24" TextLineBounds="Tight" />
            Grid>

            
            
            TextBlock Text="<>&"" Margin="5" />


            
            TextBlock Text="==&&" Margin="5" />

        StackPanel>
    Grid>
Page>

Controls/TextControl/TextBlockDemo1.xaml.cs

/*
 * TextBlock - 文本显示框(继承自 FrameworkElement, 请参见 /Controls/BaseControl/FrameworkElementDemo/)
 */

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace Windows10.Controls.TextControl
{
    public sealed partial class TextBlockDemo1 : Page
    {
        public TextBlockDemo1()
        {
            this.InitializeComponent();
        }
    }
}


2、TextBlock 的示例 2
Controls/TextControl/TextBlockDemo2.xaml

Page
    x:Class="Windows10.Controls.TextControl.TextBlockDemo2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.TextControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    Grid Background="Transparent">
        StackPanel Margin="10 0 10 10">

            
            TextBlock Name="textBlock1" Margin="5" IsTextSelectionEnabled="True" SelectionHighlightColor="Red">
                TextBlock.Inlines>
                    Run>abcdefgRun>
                    LineBreak />
                    Run>hijklmnRun>
                    LineBreak />
                    Run>opqrstRun>
                TextBlock.Inlines>
            TextBlock>
            
            TextBlock Name="lblMsg1" Margin="5" />


            TextBlock Name="textBlock2" Margin="5" IsTextSelectionEnabled="True" SelectionHighlightColor="Red">
                Run>abcdefghijklmnRun>
                LineBreak />
                Run>opqrstuvwxyzRun>
            TextBlock>
            TextBlock Name="lblMsg2" Margin="5" />


            Grid Background="Red" Margin="5">
                TextBlock Name="textBlock3" Text="abcdefghijklmnopqrstuvwxyz" FontSize="24" />
                
                Line Name="line" Stroke="Blue" StrokeThickness="1" X1="0" X2="300" />
            Grid>
            TextBlock Name="lblMsg3" Margin="5" />


            
            TextBlock Name="textBlock4" Margin="5" FontSize="24" TextWrapping="Wrap" />


            
            Grid Name="grid" Margin="5">
                Grid.ColumnDefinitions>
                    ColumnDefinition x:Name="gridColumn1" Width="Auto" />
                    ColumnDefinition x:Name="gridColumn2" Width="*" />
                Grid.ColumnDefinitions>
                TextBlock Name="textBlock5" FontSize="24">
                    Run>abcRun>
                    LineBreak />
                    Run>xyzRun>
                TextBlock>
            Grid>
            TextBlock Name="lblMsg5" Margin="5" />

        StackPanel>
    Grid>
Page>

Controls/TextControl/TextBlockDemo2.xaml.cs

/*
 * TextBlock - 文本显示框(继承自 FrameworkElement, 请参见 /Controls/BaseControl/FrameworkElementDemo/)
 *     SelectedText - 获取选中的文本内容
 *     SelectionChanged - 选中的文本内容发生变化后触发的事件
 *     ContentStart - 开头内容的 TextPointer 对象
 *     ContentEnd - 结尾内容的 TextPointer 对象
 *     Focus(FocusState value) - 获取焦点
 *     SelectAll() - 选中全部内容(先要获取焦点后,才能做这个操作)
 *     Select(TextPointer start, TextPointer end) - 选中指定范围的内容(先要获取焦点后,才能做这个操作)
 *     SelectionStart - 选中内容的起始位置(TextPointer 对象)
 *     SelectionEnd - 选中内容的结束位置(TextPointer 对象)
 *     BaselineOffset - 获取基线的位置(什么是基线:英文字符的基线基本相当于单词本4条线中的第3条线)
 *     IsColorFontEnabled - 是否以彩色方式显示 Segoe UI Emoji 之类的字符(默认值是 true) 
 *
 *
 * TextPointer - 文本框中的指针对象
 *     Offset - 指针的位置
 *     LogicalDirection - 指针的逻辑方向
 *         Backward - 向后,即从右到左(比如,如果插入字符的话,就会在指针位置的左边插入)
 *         Forward - 向前,即从左到右(比如,如果插入字符的话,就会在指针位置的右边插入)
 *     Rect GetCharacterRect(LogicalDirection direction) - 返回当前指针的矩形框
 *     TextPointer GetPositionAtOffset(offset, LogicalDirection direction) - 将指针位置偏移指定的距离(正代表向右偏移,负代表向左偏移)
 */

using System;
using System.Text;
using Windows.Foundation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Documents;

namespace Windows10.Controls.TextControl
{
    public sealed partial class TextBlockDemo2 : Page
    {
        public TextBlockDemo2()
        {
            this.InitializeComponent();

            this.Loaded += TextBlockDemo2_Loaded;
        }

        private void TextBlockDemo2_Loaded(object sender, RoutedEventArgs e)
        {
            textBlock1.SelectionChanged += (x, y) =>
            {
                // 显示用户选中的文本内容
                lblMsg1.Text = textBlock1.SelectedText;
            };

            textBlock1.ContextMenuOpening += (x, y) =>
            {
                // 触发条件:触摸屏长按或鼠标右键 
            };



            // 获取焦点
            textBlock2.Focus(FocusState.Programmatic);
            TextPointer start = textBlock2.ContentStart;
            TextPointer end = textBlock2.ContentEnd;
            // textBlock2 的 Text 的内容一共有 26 个字符,但是这里的指针位置 offset 是从 0 到 34,一共 35 个指针位置
            //  占 4 个指针位置,开头占 2 个指针位置,结尾占 2 个指针位置。剩下的就比较好理解了,就是 26 个字符拥有 27 个指针位置
            lblMsg2.Text = $"ContentStart.Offset: {start.Offset}, ContentEnd.Offset: {end.Offset}";
            lblMsg2.Text += Environment.NewLine;

            // 从左到右偏移 3 个位置,即指针位置在第 1 个字符的右边
            start = start.GetPositionAtOffset(3, LogicalDirection.Backward);
            // 从右到左偏移 3 个位置,即指针位置在最后一个字符的左边
            end = end.GetPositionAtOffset(-3, LogicalDirection.Forward);
            textBlock2.Select(start, end); // SelectAll() - 选中全部
            lblMsg2.Text += $"SelectionStart.Offset: {textBlock2.SelectionStart.Offset}, SelectionEnd.Offset: {textBlock2.SelectionEnd.Offset}";



            // 获取基线的位置,并通过 Line 绘制基线
            lblMsg3.Text += $"BaselineOffset: {textBlock3.BaselineOffset}";
            line.Y1 = textBlock3.BaselineOffset;
            line.Y2 = textBlock3.BaselineOffset;

            

            // 显示 Segoe UI Emoji 字符
            StringBuilder strContect = new StringBuilder();
            for (int code = 0x1F600; code 0x1F6C6; code++)
            {
                strContect.Append(char.ConvertFromUtf32(code));
            }
            // 是否以彩色方式显示 Segoe UI Emoji 之类的字符(默认值是 true) 
            textBlock4.IsColorFontEnabled = true;
            textBlock4.Text = strContect.ToString();



            // 通过封一层 Grid 的方式计算 TextBlock 的实际宽度和实际高度
            lblMsg5.Text = $"textBlock5 的实际高度: {grid.ActualHeight}";
            lblMsg5.Text += Environment.NewLine;
            lblMsg5.Text += $"textBlock5 的实际宽度: {gridColumn1.ActualWidth}";
            lblMsg5.Text += Environment.NewLine;

            // 通过 TextPointer 的方式计算 TextBlock 的实际高度
            TextPointer last = textBlock5.ContentEnd;
            last = last.GetPositionAtOffset(-3, LogicalDirection.Forward);
            Rect rectLast = last.GetCharacterRect(LogicalDirection.Forward);
            lblMsg5.Text += $"textBlock5 的实际高度: {rectLast.Bottom}";
            lblMsg5.Text += Environment.NewLine;

            // 通过 TextPointer 的方式计算 TextBlock 的实际宽度
            int count = textBlock5.ContentEnd.Offset - textBlock5.ContentStart.Offset;
            double width = 0;
            for (int i = 0; i )
            {
                TextPointer current = textBlock5.ContentStart.GetPositionAtOffset(i, LogicalDirection.Backward);
                width = Math.Max(width, current.GetCharacterRect(LogicalDirection.Backward).Right);
            }
            lblMsg5.Text += $"textBlock5 的实际宽度: {width}";
        }
    }
}


3、使用自定义字体, 使用 Unicode 编码
Controls/TextControl/Tips.xaml

Page
    x:Class="Windows10.Controls.TextControl.Tips"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.TextControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    Grid Background="Transparent">
        StackPanel Margin="10 0 10 10">

            
            TextBlock Text="逐浪大雪钢笔体" FontSize="36" Margin="5" 
                       FontFamily="/Controls/TextControl/MyFont.otf#逐浪大雪钢笔体">
                
            TextBlock>


            
            TextBlock Text=""123"
123" FontSize="36" Margin="5" />

        StackPanel>
    Grid>
Page>

Controls/TextControl/Tips.xaml.cs

/*
 * 演示文本类控件如何使用自定义字体,以及使用 Unicode 编码
 */

using Windows.UI.Xaml.Controls;

namespace Windows10.Controls.TextControl
{
    public sealed partial class Tips : Page
    {
        public Tips()
        {
            this.InitializeComponent();
        }
    }
}

OK
[源码下载]

背水一战 Windows 10 (27) - 控件(文本类): TextBlock

标签:鼠标   颜色   change   ssi   显示不全   dir   stroke   字体   触摸   

原文地址:http://www.cnblogs.com/lonelyxmas/p/7567230.html


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