/// <summary>
/// Draws the background image defined by the visual style for the specified control part
/// </summary>
/// <param name="g">The Graphics to draw on</param>
/// <param name="windowClass">The class of the part to draw</param>
/// <param name="part">The part to draw</param>
/// <param name="partState">The state of the part to draw</param>
/// <param name="drawRect">The Rectangle in which the part is drawn</param>
/// <param name="clipRect">The Rectangle that represents the clipping area for the part</param>
public static void DrawThemeBackground(Graphics g, string windowClass, int part, int partState, Rectangle drawRect, Rectangle clipRect)
{
if (g == null || drawRect.Width <= 0 || drawRect.Height <= 0 || clipRect.Width <= 0 || clipRect.Height <= 0)
{
return;
}
// open theme data
IntPtr hTheme = IntPtr.Zero;
hTheme = I3NativeMethods.OpenThemeData(hTheme, windowClass);
// make sure we have a valid handle
if (hTheme != IntPtr.Zero)
{
// get a graphics object the UxTheme can draw into
IntPtr hdc = g.GetHdc();
// get the draw and clipping rectangles
I3RECT dRect = I3RECT.FromRectangle(drawRect);
I3RECT cRect = I3RECT.FromRectangle(clipRect);
// draw the themed background
I3NativeMethods.DrawThemeBackground(hTheme, hdc, part, partState, ref dRect, ref cRect);
// clean up resources
g.ReleaseHdc(hdc);
}
// close the theme handle
I3NativeMethods.CloseThemeData(hTheme);
}
/// <summary>
/// 响应垂直滚动条滚动事件
/// Occurs when the Table's vertical scrollbar is scrolled
/// </summary>
/// <param name="sender">The object that Raised the event</param>
/// <param name="e">A ScrollEventArgs that contains the event data</param>
protected void OnVerticalScroll(object sender, ScrollEventArgs e)
{
int scrollVal = e.OldValue - e.NewValue;
if (scrollVal != 0)
{
Rectangle invalidateRect = new Rectangle(0, 0, this.Width - VScrollWidth, this.Height - HScrollHeight);
I3RECT scrollRect = I3RECT.FromRectangle(invalidateRect);
scrollRect.top += 1;
I3NativeMethods.ScrollWindow(this.Handle, 0, scrollVal, ref scrollRect, ref scrollRect);
if (scrollVal < 0)
{
invalidateRect.Y = invalidateRect.Bottom + scrollVal;
}
invalidateRect.Height = Math.Abs(scrollVal) + 1;
this.Invalidate(invalidateRect, false);
}
}
protected void OnHorizontalScroll(object sender, ScrollEventArgs e)
{
int scrollVal = e.OldValue - e.NewValue;
if (scrollVal != 0)
{
Rectangle invalidateRect = new Rectangle(0, 0, this.Width - VScrollWidth, this.Height - HScrollHeight);
I3RECT scrollRect = I3RECT.FromRectangle(invalidateRect);
//移动窗体的绘画区
I3NativeMethods.ScrollWindow(this.Handle, scrollVal, 0, ref scrollRect, ref scrollRect);
//计算重绘区域
if (scrollVal < 0)
{
invalidateRect.X = invalidateRect.Right + scrollVal;
}
invalidateRect.Width = Math.Abs(scrollVal) + 1;
this.Invalidate(invalidateRect, false);
}
}