[英]Change the font color of a winform datetimepicker when disabled
我正在创建在Windows窗体应用程序中禁用时使用标准字体颜色的自定义控件,但为使DateTimePicker
正常工作而感到困惑。
我找到了很多答案,但是它们已经有10多年的历史了,似乎不再起作用。 这是2007年的一个简单答案,但是当我复制它时,它可以将Font
设置为enabled/disabled
但是外围的组合框图形不再绘制。
进行更多的挖掘,我发现了一些更完整的代码来绘制组合框图形,并结合了第一个简单的答案,我创建了以下类:
public partial class CustomDatetimePicker : DateTimePicker
{
public CustomDatetimePicker()
{
InitializeComponent();
this.SetStyle(ControlStyles.UserPaint, true);
}
protected override void OnPaint(PaintEventArgs pe)
{
//Graphics g = this.CreateGraphics();
Graphics g = pe.Graphics;
//The dropDownRectangle defines position and size of dropdownbutton block,
//the width is fixed to 17 and height to 16. The dropdownbutton is aligned to right
Rectangle dropDownRectangle = new Rectangle(ClientRectangle.Width - 17, 0, 17, 16);
Brush bkgBrush;
Brush txtBrush;
ComboBoxState visualState;
//When the control is enabled the brush is set to Backcolor,
//otherwise to color stored in _backDisabledColor
if (this.Enabled)
{
bkgBrush = new SolidBrush(SystemColors.Window);
txtBrush = new SolidBrush(SystemColors.WindowText);
visualState = ComboBoxState.Normal;
}
else
{
bkgBrush = new SolidBrush(SystemColors.InactiveBorder);
txtBrush = new SolidBrush(SystemColors.WindowText);
visualState = ComboBoxState.Disabled;
}
// Painting...in action
//Filling the background
g.FillRectangle(bkgBrush, 0, 0, ClientRectangle.Width, ClientRectangle.Height);
//Drawing the datetime text
g.DrawString(this.Text, this.Font, txtBrush, 0, 2);
//Drawing the dropdownbutton using ComboBoxRenderer
if (ComboBoxRenderer.IsSupported)
{
ComboBoxRenderer.DrawDropDownButton(g, dropDownRectangle, visualState);
}
g.Dispose();
bkgBrush.Dispose();
}
}
但是在我的情况下,不支持ComboBoxRenderer
因此它不会绘画,而且我看不到另一种简单的绘制方法,而无需从头开始构建控件。
所以我要以正确的方式这样做吗? 是否有一个简单的答案(如提供的第一个链接),或者提供了代码,还有使用ComboBoxRenderer
的替代方法吗?
我做了类似的事情,但是我认为在禁用控件时不必绘制下拉按钮,因为无论如何不能单击它。 禁用UserPaint
,将样式设置为UserPaint
,否则让控件自己绘制。
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
var graphics = e.Graphics;
var clientRectangle = ClientRectangle;
var font = Font;
var text = Text;
var textSize = TextRenderer.MeasureText(text, font);
var textBounds = DrawingHelper.AlignInRectangle(clientRectangle, textSize, ContentAlignment.MiddleLeft);
graphics.FillRectangle(new SolidBrush(SystemColors.Control), ClientRectangle);
ControlPaint.DrawBorder(graphics, clientRectangle, SystemColors.ControlDark, ButtonBorderStyle.Solid);
TextRenderer.DrawText(graphics, text, font, textBounds, SystemColors.WindowText);
}
protected override void OnEnabledChanged(EventArgs e)
{
base.OnEnabledChanged(e);
SetStyle();
}
public void SetStyle()
{
if (DesignMode)
return;
SetStyle(ControlStyles.UserPaint, !Enabled);
Invalidate();
}
public static class DrawingHelper
{
public static Rectangle AlignInRectangle(Rectangle outer, Size inner, ContentAlignment alignment)
{
int x = 0;
int y = 0;
switch (alignment)
{
case ContentAlignment.BottomLeft:
case ContentAlignment.MiddleLeft:
case ContentAlignment.TopLeft:
x = outer.X;
break;
case ContentAlignment.BottomCenter:
case ContentAlignment.MiddleCenter:
case ContentAlignment.TopCenter:
x = Math.Max(outer.X + ((outer.Width - inner.Width) / 2), outer.Left);
break;
case ContentAlignment.BottomRight:
case ContentAlignment.MiddleRight:
case ContentAlignment.TopRight:
x = outer.Right - inner.Width;
break;
}
switch (alignment)
{
case ContentAlignment.TopCenter:
case ContentAlignment.TopLeft:
case ContentAlignment.TopRight:
y = outer.Y;
break;
case ContentAlignment.MiddleCenter:
case ContentAlignment.MiddleLeft:
case ContentAlignment.MiddleRight:
y = outer.Y + (outer.Height - inner.Height) / 2;
break;
case ContentAlignment.BottomCenter:
case ContentAlignment.BottomRight:
case ContentAlignment.BottomLeft:
y = outer.Bottom - inner.Height;
break;
}
return new Rectangle(x, y, Math.Min(inner.Width, outer.Width), Math.Min(inner.Height, outer.Height));
}
}
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