Question

我想使用自定义垂直滚动条更改文本框的垂直滚动位置，所以这是我的代码。

    private void textBox1_Load(object sender, EventArgs e)
    {
        vScrollBar1.Value = textBox1.VerticalScroll.Value;
        textBox1.VerticalScroll.Value = vScrollBar1.Value;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        vScrollBar1.Minimum = textBox1.VerticalScroll.Minimum;
        vScrollBar1.Maximum = textBox1.VerticalScroll.Maximum;
        vScrollBar1.Value = textBox1.VerticalScroll.Value;
    }

    private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
    {
        textBox1.VerticalScroll.Minimum = vScrollBar1.Minimum;
        textBox1.VerticalScroll.Maximum = vScrollBar1.Maximum;
        textBox1.VerticalScroll.Value = vScrollBar1.Value;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        vScrollBar1.Minimum = textBox1.VerticalScroll.Minimum;
        vScrollBar1.Maximum = textBox1.VerticalScroll.Maximum;
        vScrollBar1.Value = textBox1.VerticalScroll.Value;
    }

在这里，我可以使文本框的滚动条值与自定义滚动条相同，但是当我尝试使用自定义滚动条修改该值不起作用时，有人可以帮助我吗？

Answer 1

以编程方式更改滚动值也可能引发事件。您应该确保在执行此操作时不要再次处理事件。为此使用标志。

private bool _changing;

private void ScrollingFromTextBoxToScrollBar()
{
    if (!_changing) {
        _changing = true;
        try {
            vScrollBar1.Minimum = textBox1.VerticalScroll.Minimum;
            vScrollBar1.Maximum = textBox1.VerticalScroll.Maximum;
            vScrollBar1.Value = textBox1.VerticalScroll.Value;
        } finally {
            _changing = false;
        }
    }
}

private void ScrollingFromScrollBarToTextBox()
{
    if (!_changing) {
        _changing = true;
        try {
            textBox1.VerticalScroll.Minimum = vScrollBar1.Minimum;
            textBox1.VerticalScroll.Maximum = vScrollBar1.Maximum;
            textBox1.VerticalScroll.Value = vScrollBar1.Value;
        } finally {
            _changing = false;
        }
    }
}

然后在加载时应用那些。我会从FastColoredTextBox中获取值，因为它内部有自己的逻辑。

private void Form1_Load(object sender, EventArgs e)
{
    ScrollingFromTextBoxToScrollBar();
}

private void textBox1_Load(object sender, EventArgs e)
{
    ScrollingFromTextBoxToScrollBar();
}

观看滚动条

private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
    ScrollingFromScrollBarToTextBox();
}

并且您还必须注意编辑时FastColoredTextBox的滚动，以适应滚动条的滚动位置

private void textBox1_Scroll(object sender, ScrollEventArgs e)
{
    ScrollingFromTextBoxToScrollBar();
}

使用自定义滚动条更改TextBox滚动位置

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