我将首先发布我的代码,因为它简短易懂,然后我会问我的问题。
public class BatteryLabel : Control
{
private Color _captionColor = SystemColors.Control;
private Color _textColor = SystemColors.Info;
private Color _failColor = Color.Red;
private Color _passColor = Color.Green;
private string _caption;
string text2;
string text3;
bool battery1Fail = false;
bool battery2Fail = false;
bool battery3Fail = false;
public BatteryLabel()
{
}
public Color BackgroundTextColor
{
get{ return _textColor;}
set{_textColor = value; Invalidate();}
}
public string Caption
{
get
{
return _caption;
}
set
{
_caption = value;
Invalidate();
}
}
public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
Invalidate();
}
}
public string Text2
{
get { return text2; }
set { text2 = value; Invalidate(); }
}
public string Text3
{
get { return text3; }
set { text3 = value; Invalidate(); }
}
public bool Battery1Fail
{
get { return battery1Fail; }
set { battery1Fail = value; Invalidate(); }
}
public bool Battery2Fail
{
get { return battery2Fail; }
set { battery2Fail = value; Invalidate(); }
}
public bool Battery3Fail
{
get { return battery3Fail; }
set { battery3Fail = value; Invalidate(); }
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.DrawRectangle(Pens.Black, 0,0, Width-1, Height-1);
var x1 = 50;
var x2 = 98;
var x3 = 146;
var color1 = battery1Fail?_failColor:BackgroundTextColor;
var color2 = battery2Fail?_failColor:BackgroundTextColor;
var color3 = battery3Fail?_failColor:BackgroundTextColor;
e.Graphics.FillRectangle(new SolidBrush(color1),x1+1, 1, 47, Height-2);
e.Graphics.FillRectangle(new SolidBrush(color2),x2+1, 1, 47, Height-2);
e.Graphics.FillRectangle(new SolidBrush(color3),x3+1, 1, 47, Height-2);
e.Graphics.DrawLine(Pens.Black, x1,0, x1, Height-1);
e.Graphics.DrawLine(Pens.Black, x2,0, x2, Height-1);
e.Graphics.DrawLine(Pens.Black, x3,0, x3, Height-1);
var BoldFont = new Font(this.Font, FontStyle.Bold);
e.Graphics.DrawString(Caption, BoldFont, new SolidBrush(ForeColor), 0,0);
e.Graphics.DrawString(Text, this.Font, new SolidBrush(ForeColor), x1,0);
e.Graphics.DrawString(Text2, this.Font, new SolidBrush(ForeColor), x2,0);
e.Graphics.DrawString(Text3, this.Font, new SolidBrush(ForeColor), x3,0);
}
}
控件大小应为 195,14,以防您决定尝试使用它。我在一个 200,200 的面板中有 8 个,在 1.6Ghz 原子处理器上运行。它用于在计算机上显示最多 3 节电池的值。标签每 500 毫秒刷新一次。正如您可能已经收集到的那样,有一点闪烁,但这是可以忍受的。如果可能的话,我希望更少。所以我开始研究使用更新,并移动我的一些代码,比如我想也许我应该把它移动到 OnPaintBackground() 的背景位,但是在我组成的测试框架中,更新方法并没有改变任何东西,并且当我使用 Invalidate 方法时,它同时运行 OnPaintBackground 和 OnPaint。这是我在这种情况下尝试过的。
public class InformationLabel : Control
{
Random r = new Random();
protected override void OnPaintBackground(PaintEventArgs e)
{
base.OnPaintBackground(e);
Color randomCOlor = Color.FromArgb(r.Next());
e.Graphics.FillRectangle(new SolidBrush(randomCOlor),0,0, Width-1, Height-1);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Color randomCOlor = Color.FromArgb(r.Next());
e.Graphics.FillPie(new SolidBrush(randomCOlor),15,15,15,15, 0.0f, 120.0f);
}
}
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
void Button1Click(object sender, EventArgs e)
{
informationLabel1.Update();
}
void Button2Click(object sender, EventArgs e)
{
informationLabel1.Invalidate();
}
}
我将一个用户控件设置为大约 300,300,因此我可以确定我所看到的。我忘了提到在我的 500 毫秒计时器的电池控制中,我只是更新文本、文本 2 和文本 3。我在想,如果该文本的值超出规范,我将设置电池故障标志,然后无效.. 但我不确定。那么我应该如何只更新文本???