private void DrawUpDownButton()
{
bool mouseOver = false;
bool mousePress = LeftKeyPressed();
bool mouseInUpButton = false;
RECT rect = new RECT();
GetClientRect(base.Handle, ref rect);
Rectangle clipRect = Rectangle.FromLTRB(
rect.Top, rect.Left, rect.Right, rect.Bottom);
Point cursorPoint = new Point();
GetCursorPos(ref cursorPoint);
GetWindowRect(base.Handle, ref rect);
mouseOver = PtInRect(ref rect, cursorPoint);
cursorPoint.X -= rect.Left;
cursorPoint.Y -= rect.Top;
mouseInUpButton = cursorPoint.X < clipRect.Width / 2;
using (Graphics g = Graphics.FromHwnd(base.Handle))
{
UpDownButtonPaintEventArgs e =
new UpDownButtonPaintEventArgs(
g,
clipRect,
mouseOver,
mousePress,
mouseInUpButton);
_owner.OnPaintUpDownButton(e);
}
}
/// <summary>
/// 对左右键进行重绘
/// </summary>
/// <param name="e">左右键的参数，继承painteventargs</param>
protected virtual void OnPaintUpDownButton(
UpDownButtonPaintEventArgs e)
{
Graphics g = e.Graphics;
Rectangle rect = e.ClipRectangle;//程序分配给左右箭头的矩形
Color upButtonBaseColor = _baseColor;
Color upButtonBorderColor = _borderColor;
Color upButtonArrowColor = _arrowColor;
Color downButtonBaseColor = _baseColor;
Color downButtonBorderColor = _borderColor;
Color downButtonArrowColor = _arrowColor;
Rectangle upButtonRect = rect;
Bitmap bmp = new Bitmap(rect.Width, rect.Height);
Graphics gb = Graphics.FromImage(bmp);
Rectangle bmpRect = new Rectangle(0, 0, rect.Width, rect.Height);
upButtonRect.X = 1;
upButtonRect.Y = 1;
upButtonRect.Width = rect.Width / 2 - 4;
upButtonRect.Height -= 2;
Rectangle downButtonRect = rect;
downButtonRect.X = upButtonRect.Right + 2;
downButtonRect.Y = 1;
downButtonRect.Width = rect.Width / 2 - 4;
downButtonRect.Height -= 2;
if (Enabled)
{
if (e.MouseOver)
{
if (e.MousePress)//按下键时
{
if (e.MouseInUpButton)
{
upButtonBaseColor = GetColor(_baseColor, 0, -35, -24, -9);
}
else
{
downButtonBaseColor = GetColor(_baseColor, 0, -35, -24, -9);
}
}
else//仅仅是鼠标over未按键时
{
if (e.MouseInUpButton)
{
upButtonBaseColor = GetColor(_baseColor, 0, 35, 24, 9);
}
else
{
downButtonBaseColor = GetColor(_baseColor, 0, 35, 24, 9);
}
}
}
}
else
{
upButtonBaseColor = SystemColors.Control;
upButtonBorderColor = SystemColors.ControlDark;
upButtonArrowColor = SystemColors.ControlDark;
downButtonBaseColor = SystemColors.Control;
downButtonBorderColor = SystemColors.ControlDark;
downButtonArrowColor = SystemColors.ControlDark;
}
g.SmoothingMode = SmoothingMode.AntiAlias;
gb.SmoothingMode = SmoothingMode.AntiAlias;
Color backColor = Enabled ? _backColor : SystemColors.Control;
using (SolidBrush brush = new SolidBrush(_backColor))
{
rect.Inflate(1, 1);
gb.FillRectangle(brush, bmpRect);
}
RenderButton(
gb,
upButtonRect,
upButtonBaseColor,
upButtonBorderColor,
upButtonArrowColor,
ArrowDirection.Left);
RenderButton(
gb,
downButtonRect,
downButtonBaseColor,
downButtonBorderColor,
downButtonArrowColor,
ArrowDirection.Right);
g.DrawImage(bmp, rect.X, rect.Y);
bmp.Dispose();
gb.Dispose();
UpDownButtonPaintEventHandler handler =
base.Events[EventPaintUpDownButton] as UpDownButtonPaintEventHandler;
if (handler != null)
{
handler(this, e);
}
}