如何更改富文本框中所选文本或所有文本的字体 [英] How do I change the font of selected text or all text in a rich text box

问题描述

我正在使用文本编辑器，我使用的一个按钮是更改richtextbox中所有文本的字体类型和大小，如果你只选择那些文本应该用fontDialog改变的代码。代码我现在可以选择文本并更改所选文本的样式，然后继续使用我开始使用的原始字体类型进行输入。我只需要帮助代码我可以用来更改所有文本，如果没有选择/高亮



我尝试过：

I'm working on a text editor and the one button i use is to change the font type and size of all the text in in a richtextbox and if you select something only that text should change with the fontDialog..The code i have at the moment i can select text and change the selected text's style and then continue typing with the original font type i started with..i just need help with the code i can you use to change all the text if nothing is selected/higlighted

What I have tried:

if (fontDialog1.ShowDialog() == DialogResult.OK & !String.IsNullOrEmpty(rtbText.Text))
{
                
  rtbText.SelectionFont = fontDialog1.Font;
}

推荐答案

您可以在更改SelectedFont之前选择所有文本：

You can select all the text before changing SelectedFont:

rtbText.SelectAll();
rtbText.SelectionFont = fontDialog1.Font;

我过去曾经用过这个;它以与未选择的方式相同的方式处理全选的情况。并且，您可以选择在字体更改后重置选择。

I've used this in the past; it handles the case of all-selected in the same way as none-selected. And, you can, optionally, reset the selection after the Font change.

private void SetFont(RichTextBox rtbx, bool restoreselection = false)
{
    int selStart = rtbx.SelectionStart;
    int selLength = rtbx.SelectionLength;

    if (fontDialog1.ShowDialog() == DialogResult.OK)
    {
        if (selLength == 0) rtbx.SelectAll();

        rtbx.SelectionFont = fontDialog1.Font;

        if (restoreselection)
        {
            rtbx.Focus();
            rtbx.SelectionStart = selStart;
            rtbx.SelectionLength = selLength;
        }
    }
}

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