在 RichTextBox 中选择一个词时如何显示面板?
How do I display a Panel when selecting a word in a RichTextBox?
当我 select 或双击 RichTextBox
中的一个词时,一个面板应该 出现在这个词的上方 (这个 panel
最初是隐藏的,并在单词突出显示时出现)。当我移除 selection 时,panel
应该消失。
private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
if (richTextBox1.SelectedText.Length > 0)
panel1.Visible = true;
else
panel1.Visible = false;
}
根据你的修改,你需要一个自定义控件来实现这个。
为此设置您的自定义位置,另一个问题可能是您的 Control
(此处:buttonOverlay
)的 z-index
(优先级)。使用 buttonOverlay.BringToFront()
,您会将其设置在前面。
private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
if (richTextBox1.SelectedText.Length > 0)
{
Point relativePoint = rTxtBxSelectionTester.GetPositionFromCharIndex(rTxtBxSelectionTester.SelectionStart);
int txtBsPosX = relativePoint.X + rTxtBxSelectionTester.Location.X;
int txtBxPosY = relativePoint.Y + rTxtBxSelectionTester.Location.Y - this.buttonOverlay.Size.Height;
relativePoint = new Point(txtBsPosX, txtBxPosY);
this.buttonOverlay.Location = relativePoint;
this.buttonOverlay.Visible = true;
this.buttonOverlay.BringToFront();
}
else
{
this.buttonOverlay.Visible = false;
}
}
要添加自定义 Control
,请将以下代码添加到您的 Form
构造函数中:
this.buttonOverlay = new FormattingOverlay(this);
this.Controls.Add(this.buttonOverlay);
this.buttonOverlay.Visible = false;`
FormattingOverlay
是继承自UserControl
的class:
public partial class FormattingOverlay : UserControl
{
public FormattingOverlay(Form1 mainForm)
{
this.mainForm = mainForm;
InitializeComponent();
}
private void btnBold_Click(object sender, EventArgs e)
{
RichTextBox rTxtBx = mainForm.rTxtBxSelectionTester;
rTxtBx.SelectionFont = new Font(rTxtBx.Font, FontStyle.Bold);
rTxtBx.SelectionStart = rTxtBx.SelectionStart + rTxtBx.SelectionLength;
rTxtBx.SelectionLength = 0;
rTxtBx.SelectionFont = rTxtBx.Font;
}
}
可以找到整个示例项目via this link.
当我 select 或双击 RichTextBox
中的一个词时,一个面板应该 出现在这个词的上方 (这个 panel
最初是隐藏的,并在单词突出显示时出现)。当我移除 selection 时,panel
应该消失。
private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
if (richTextBox1.SelectedText.Length > 0)
panel1.Visible = true;
else
panel1.Visible = false;
}
根据你的修改,你需要一个自定义控件来实现这个。
为此设置您的自定义位置,另一个问题可能是您的 Control
(此处:buttonOverlay
)的 z-index
(优先级)。使用 buttonOverlay.BringToFront()
,您会将其设置在前面。
private void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
if (richTextBox1.SelectedText.Length > 0)
{
Point relativePoint = rTxtBxSelectionTester.GetPositionFromCharIndex(rTxtBxSelectionTester.SelectionStart);
int txtBsPosX = relativePoint.X + rTxtBxSelectionTester.Location.X;
int txtBxPosY = relativePoint.Y + rTxtBxSelectionTester.Location.Y - this.buttonOverlay.Size.Height;
relativePoint = new Point(txtBsPosX, txtBxPosY);
this.buttonOverlay.Location = relativePoint;
this.buttonOverlay.Visible = true;
this.buttonOverlay.BringToFront();
}
else
{
this.buttonOverlay.Visible = false;
}
}
要添加自定义 Control
,请将以下代码添加到您的 Form
构造函数中:
this.buttonOverlay = new FormattingOverlay(this);
this.Controls.Add(this.buttonOverlay);
this.buttonOverlay.Visible = false;`
FormattingOverlay
是继承自UserControl
的class:
public partial class FormattingOverlay : UserControl
{
public FormattingOverlay(Form1 mainForm)
{
this.mainForm = mainForm;
InitializeComponent();
}
private void btnBold_Click(object sender, EventArgs e)
{
RichTextBox rTxtBx = mainForm.rTxtBxSelectionTester;
rTxtBx.SelectionFont = new Font(rTxtBx.Font, FontStyle.Bold);
rTxtBx.SelectionStart = rTxtBx.SelectionStart + rTxtBx.SelectionLength;
rTxtBx.SelectionLength = 0;
rTxtBx.SelectionFont = rTxtBx.Font;
}
}
可以找到整个示例项目via this link.