[英]RichTextBox and Caret Position
我選擇文字時,找不到在RTB中確定插入符號位置的方法。 SelectionStart
不是一個選項 。
我想檢測選擇的方向是向后還是向前。 我正在嘗試在SelectionChanged
事件中實現這一點。 任何提示將不勝感激。
編輯:
我通過使用mouseDown和mouseUp事件注冊鼠標移動方向(X軸)來解決此問題。
碼:
bool IsMouseButtonPushed = false;
int selectionXPosition = 0, sDirection=0;
private void richTextBox_SelectionChanged(object sender, EventArgs e)
{
if (sDirection==2)//forward
{
//dosomething
}
}
private void richTextBox_MouseMove(object sender, MouseEventArgs e)
{
if (IsMouseButtonPushed && (selectionXPosition - e.X) > 0)//backward
{
sDirection = 1;
}
else if (IsMouseButtonPushed && (selectionXPosition - e.X) < 0)//forward
{
sDirection = 2;
}
}
private void richTextBox_MouseDown(object sender, MouseEventArgs e)
{
IsMouseButtonPushed = true;
selectionXPosition = e.X;
}
private void richTextBox_MouseUp(object sender, MouseEventArgs e)
{
IsMouseButtonPushed = false;
}
還有什么其他方法可以做到?
SelectionStart和SelectionLength屬性在左側選擇期間更改,SelectionLength屬性在右側選擇期間更改。
簡單的解決方案:
int tempStart;
int tempLength;
private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
if (richTextBox1.SelectionType != RichTextBoxSelectionTypes.Empty)
{
if (richTextBox1.SelectionStart != tempStart)
lblSelectionDesc.Text = "Left" + "\n";
else if( richTextBox1.SelectionLength != tempLength)
lblSelectionDesc.Text = "Right" + "\n";
}
else
{
lblSelectionDesc.Text = "Empty" + "\n";
}
tempStart = richTextBox1.SelectionStart;
tempLength = richTextBox1.SelectionLength;
lblSelectionDesc.Text += "Start: " + richTextBox1.SelectionStart.ToString() + "\n";
lblSelectionDesc.Text += "Length: " + richTextBox1.SelectionLength.ToString() + "\n";
}
控制項:
RitchTextBox + 2xLabels
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