问题描述

我在 xaml 中有一个文本框:

<文本框名称=文本";Horizo​​ntalAlignment =左"高度=75"VerticalContentAlignment =中心"TextWrapping =NoWrap"文本=文本框"宽度=336"BorderBrush =黑色"字体大小=40"/>

我用这个方法给它添加文字:

private string words = "TextBox 的初始文本内容.";公共异步无效文本旋转(){for(int a =0; a < words.Length; a++){Text.Text = words.Substring(0,a);等待任务.延迟(500)；}}

一旦文本脱离包装，有一种方法可以聚焦结尾，使旧文本消失在左侧，新文本消失在右侧，而不是仅仅将其添加到右侧而不看到.

一种快速的方法是测量需要滚动的字符串(words)

I have a TextBox in xaml:

<TextBox Name="Text" HorizontalAlignment="Left" Height="75"   VerticalContentAlignment="Center" TextWrapping="NoWrap" Text="TextBox" Width="336"  BorderBrush="Black" FontSize="40" />

I add text to it with this method:

private string words = "Initial text contents of the TextBox.";

public async void textRotation()
{
    for(int a =0; a < words.Length; a++)
    {
        Text.Text = words.Substring(0,a);
        await Task.Delay(500);
    }
}

Once the text goes of out of the wrap is there a way to focus the end so the old text disappears to the left and the new on the right, as opposed to just adding it to the right without seeing.

A quick method is to measure the string (words) that needs scrolling with TextRenderer.MeasureText, divide the width measure in parts equals to the number of chars in the string and use ScrollToHorizontalOffset() to perform the scroll:

public async void textRotation()
{
    float textPart = TextRenderer.MeasureText(words, new Font(Text.FontFamily.Source, (float)Text.FontSize)).Width / words.Length;
    for (int i = 0; i < words.Length; i++)
    {
        Text.Text = words.Substring(0, i);
        await Task.Delay(100);
        Text.ScrollToHorizontalOffset(textPart * i);
    }
}

Same, but using the FormattedText class to measure the string:

public async void textRotation()
{
    var textFormat = new FormattedText(
        words, CultureInfo.CurrentCulture, System.Windows.FlowDirection.LeftToRight,
        new Typeface(this.Text.FontFamily, this.Text.FontStyle, this.Text.FontWeight, this.Text.FontStretch),
        this.Text.FontSize, null, null, 1);

    float textPart = (float)textFormat.Width / words.Length;
    for (int i = 0; i < words.Length; i++)
    {
        Text.Text = words.Substring(0, i);
        await Task.Delay(200);
        Text.ScrollToHorizontalOffset(textPart * i);
    }
}

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