当用户点击文本框或关注它时,如何更改文本框的BorderColor?
答案 0 :(得分:26)
如果控件具有焦点,您可以处理TextBox
的{{3}}消息并在非客户控制区域上绘制边框。您可以使用任何颜色绘制边框:
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class ExTextBox : TextBox
{
[DllImport("user32")]
private static extern IntPtr GetWindowDC(IntPtr hwnd);
private const int WM_NCPAINT = 0x85;
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_NCPAINT && this.Focused)
{
var dc = GetWindowDC(Handle);
using (Graphics g = Graphics.FromHdc(dc))
{
g.DrawRectangle(Pens.Red, 0, 0, Width - 1, Height - 1);
}
}
}
}
<强>结果强>
控制聚焦时的边框绘画完全没有闪烁:
注意强>
在当前帖子中,我只更改焦点上的边框颜色。您还可以向控件添加BorderColor
属性。然后,您可以在设计时或运行时根据您的要求更改边框颜色。 我发布了TextBox
的更完整版本,其中包含BorderColor
属性:
答案 1 :(得分:14)
试试这个
bool focus = false;
private void Form1_Paint(object sender, PaintEventArgs e)
{
if (focus)
{
textBox1.BorderStyle = BorderStyle.None;
Pen p = new Pen(Color.Red);
Graphics g = e.Graphics;
int variance = 3;
g.DrawRectangle(p, new Rectangle(textBox1.Location.X - variance, textBox1.Location.Y - variance, textBox1.Width + variance, textBox1.Height +variance ));
}
else
{
textBox1.BorderStyle = BorderStyle.FixedSingle;
}
}
private void textBox1_Enter(object sender, EventArgs e)
{
focus = true;
this.Refresh();
}
private void textBox1_Leave(object sender, EventArgs e)
{
focus = false;
this.Refresh();
}
答案 2 :(得分:10)
这是设置TextBox边框颜色的最终解决方案:
public class BorderedTextBox : UserControl
{
TextBox textBox;
public BorderedTextBox()
{
textBox = new TextBox()
{
BorderStyle = BorderStyle.FixedSingle,
Location = new Point(-1, -1),
Anchor = AnchorStyles.Top | AnchorStyles.Bottom |
AnchorStyles.Left | AnchorStyles.Right
};
Control container = new ContainerControl()
{
Dock = DockStyle.Fill,
Padding = new Padding(-1)
};
container.Controls.Add(textBox);
this.Controls.Add(container);
DefaultBorderColor = SystemColors.ControlDark;
FocusedBorderColor = Color.Red;
BackColor = DefaultBorderColor;
Padding = new Padding(1);
Size = textBox.Size;
}
public Color DefaultBorderColor { get; set; }
public Color FocusedBorderColor { get; set; }
public override string Text
{
get { return textBox.Text; }
set { textBox.Text = value; }
}
protected override void OnEnter(EventArgs e)
{
BackColor = FocusedBorderColor;
base.OnEnter(e);
}
protected override void OnLeave(EventArgs e)
{
BackColor = DefaultBorderColor;
base.OnLeave(e);
}
protected override void SetBoundsCore(int x, int y,
int width, int height, BoundsSpecified specified)
{
base.SetBoundsCore(x, y, width, textBox.PreferredHeight, specified);
}
}
答案 3 :(得分:5)
WinForms从来都不擅长这个,这有点痛苦。
您可以尝试的一种方法是在Panel中嵌入TextBox,然后根据焦点管理绘图:
public class BorderTextBox : Panel {
private Color _NormalBorderColor = Color.Gray;
private Color _FocusBorderColor = Color.Blue;
public TextBox EditBox;
public BorderTextBox() {
this.DoubleBuffered = true;
this.Padding = new Padding(2);
EditBox = new TextBox();
EditBox.AutoSize = false;
EditBox.BorderStyle = BorderStyle.None;
EditBox.Dock = DockStyle.Fill;
EditBox.Enter += new EventHandler(EditBox_Refresh);
EditBox.Leave += new EventHandler(EditBox_Refresh);
EditBox.Resize += new EventHandler(EditBox_Refresh);
this.Controls.Add(EditBox);
}
private void EditBox_Refresh(object sender, EventArgs e) {
this.Invalidate();
}
protected override void OnPaint(PaintEventArgs e) {
e.Graphics.Clear(SystemColors.Window);
using (Pen borderPen = new Pen(this.EditBox.Focused ? _FocusBorderColor : _NormalBorderColor)) {
e.Graphics.DrawRectangle(borderPen, new Rectangle(0, 0, this.ClientSize.Width - 1, this.ClientSize.Height - 1));
}
base.OnPaint(e);
}
}
答案 4 :(得分:0)
使用OnPaint
在控件上绘制自定义边框很好。但是知道如何使用OnPaint
来提高效率,并将时间降到最低。如果您在使用自定义绘图程序时遇到滞后GUI,请阅读此内容:What is the right way to use OnPaint in .Net applications?
因为PraVn的公认答案可能看似简单,但实际上效率低下。使用自定义控件,就像上面的答案中发布的那样更好。
也许性能在您的应用程序中不是问题,因为它很小,但对于具有大量自定义OnPaint例程的大型应用程序,使用PraVn显示的方式是错误的方法。
答案 5 :(得分:0)
将文本框边框样式设置为无 然后将此代码写入容器表单“paint”事件
private void Form1_Paint(object sender, PaintEventArgs e)
{
System.Drawing.Rectangle rect = new Rectangle(TextBox1.Location.X, TextBox1.Location.Y, TextBox1.ClientSize.Width, TextBox1.ClientSize.Height);
rect.Inflate(1, 1); // border thickness
System.Windows.Forms.ControlPaint.DrawBorder(e.Graphics, rect, Color.DeepSkyBlue, ButtonBorderStyle.Solid);
}
答案 6 :(得分:0)
With PictureBox1
.Visible = False
.Width = TextBox1.Width + 4
.Height = TextBox1.Height + 4
.Left = TextBox1.Left - 2
.Top = TextBox1.Top - 2
.SendToBack()
.Visible = True
End With
答案 7 :(得分:-4)
这不是很简单吗
txtbox1.BorderColor = System.Drawing.Color.Red;