从字体样式中减去标志(切换字体样式)[C#] [英] Substract Flag From FontStyle (Toggling FontStyles) [C#]

问题描述

我有一个小问题.我有一个 1 RichTextBox 和 2 个按钮.

I have a little problem. I have one 1 RichTextBox and 2 Buttons.

我有切换粗体 FStyle"和切换斜体 FStyle"的 2 个按钮.

I have that 2 buttons for "toggle Bold FStyle" and "toggle Italic FStyle".

我想切换字体样式而不影响其他字体样式.希望你能理解我.

I want to toggle FontStyles without affecting other FontStyles. I hope you understand me.

以下代码在组合 FontStyles 时有效，但在分离/减去FontStyles 时无效.

Below code works when combining FontStyles but is not working when seperating/substracting FontStyles.

private void button1_Click(object sender, EventArgs e)
{
    richTextBox1.SelectionFont = new Font(richTextBox1.Font, (richTextBox1.SelectionFont.Bold == false ? richTextBox1.SelectionFont.Style | FontStyle.Bold : richTextBox1.SelectionFont.Style));
}

private void button2_Click(object sender, EventArgs e)
{
    richTextBox1.SelectionFont = new Font(richTextBox1.Font, (richTextBox1.SelectionFont.Italic == false ? richTextBox1.SelectionFont.Style | FontStyle.Italic : richTextBox1.SelectionFont.Style));
}

1. 我将所选文本加粗
2. 我将所选文本设为斜体
3. 我想在粗体仍处于活动状态(或相反)时删除斜体

推荐答案

最简单的方法是使用按位异或(^)，它只是切换值:

The easiest way is to use bitwise XOR (^), which just toggles the value:

private void button1_Click(object sender, EventArgs e)
{
    richTextBox1.SelectionFont = new Font(richTextBox1.Font,
        richTextBox1.SelectionFont.Style ^ FontStyle.Bold);
}

private void button2_Click(object sender, EventArgs e)
{
    richTextBox1.SelectionFont = new Font(richTextBox1.Font,
        richTextBox1.SelectionFont.Style ^ FontStyle.Italic);
}

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