/// <summary>
/// 绘制边框.
/// </summary>
/// <param name="g"></param>
private void DrawBorder(Graphics g)
{
if (SelectedIndex != -1)
{
Rectangle tabRect = GetTabRect(SelectedIndex);
Rectangle clipRect = ClientRectangle;
Point[] points = new Point[6];
IntPtr upDownButtonHandle = UpDownButtonHandle;
bool hasUpDown = upDownButtonHandle != IntPtr.Zero;
if (hasUpDown)
{
if (NativeMethods.IsWindowVisible(upDownButtonHandle))
{
NativeMethods.RECT upDownButtonRect = new NativeMethods.RECT();
NativeMethods.GetWindowRect(upDownButtonHandle, ref upDownButtonRect);
Rectangle upDownRect = Rectangle.FromLTRB(
upDownButtonRect.Left,
upDownButtonRect.Top,
upDownButtonRect.Right,
upDownButtonRect.Bottom);
upDownRect = RectangleToClient(upDownRect);
tabRect.X = tabRect.X > upDownRect.X ? upDownRect.X : tabRect.X;
tabRect.Width = tabRect.Right > upDownRect.X ? upDownRect.X - tabRect.X : tabRect.Width;
}
}
switch (Alignment)
{
case TabAlignment.Top:
points[0] = new Point(tabRect.X, tabRect.Bottom);
points[1] = new Point(clipRect.X, tabRect.Bottom);
points[2] = new Point(clipRect.X, clipRect.Bottom - 1);
points[3] = new Point(clipRect.Right - 1, clipRect.Bottom - 1);
points[4] = new Point(clipRect.Right - 1, tabRect.Bottom);
points[5] = new Point(tabRect.Right, tabRect.Bottom);
break;
case TabAlignment.Bottom:
points[0] = new Point(tabRect.X, tabRect.Y);
points[1] = new Point(clipRect.X, tabRect.Y);
points[2] = new Point(clipRect.X, clipRect.Y);
points[3] = new Point(clipRect.Right - 1, clipRect.Y);
points[4] = new Point(clipRect.Right - 1, tabRect.Y);
points[5] = new Point(tabRect.Right, tabRect.Y);
break;
case TabAlignment.Left:
points[0] = new Point(tabRect.Right, tabRect.Y);
points[1] = new Point(tabRect.Right, clipRect.Y);
points[2] = new Point(clipRect.Right - 1, clipRect.Y);
points[3] = new Point(clipRect.Right - 1, clipRect.Bottom - 1);
points[4] = new Point(tabRect.Right, clipRect.Bottom - 1);
points[5] = new Point(tabRect.Right, tabRect.Bottom);
break;
case TabAlignment.Right:
points[0] = new Point(tabRect.X, tabRect.Y);
points[1] = new Point(tabRect.X, clipRect.Y);
points[2] = new Point(clipRect.X, clipRect.Y);
points[3] = new Point(clipRect.X, clipRect.Bottom - 1);
points[4] = new Point(tabRect.X, clipRect.Bottom - 1);
points[5] = new Point(tabRect.X, tabRect.Bottom);
break;
}
using (Pen pen = new Pen(_BorderColor))
{
g.DrawLines(pen, points);
}
}
}
private void RePaint()
{
ImageComboBoxItem item = _Owner.SelectedItem;
var rcClient = new NativeMethods.RECT();
NativeMethods.GetClientRect(Handle, ref rcClient);
bool rightToLeft = IsRightToLeft(Handle);
IntPtr handle = Handle;
IntPtr hdc = NativeMethods.GetDC(handle);
if (hdc == IntPtr.Zero)
{
return;
}
try
{
using (Graphics g = Graphics.FromHdc(hdc))
{
int itemSize = _Owner.ItemHeight;
var imageRect = new Rectangle(0, rcClient.Top + (rcClient.Bottom - itemSize) / 2, itemSize, itemSize);
var textRect = new Rectangle(0, 0, rcClient.Right - itemSize - 6, rcClient.Bottom);
if (rightToLeft)
{
imageRect.X = rcClient.Right - itemSize - 2;
textRect.X = 2;
}
else
{
imageRect.X = 2;
textRect.X = imageRect.Right + 2;
}
if (_Owner.Text.Length == 0)
{
DrawImage(g, imageRect, _Owner.DefaultImage, _Owner.DefaultImageList, 0, _Owner.Focused);
if (_Owner.Text.Length == 0 && !string.IsNullOrEmpty(_Owner.EmptyTextTip) && !_Owner.Focused)
{
TextFormatFlags format = TextFormatFlags.EndEllipsis | TextFormatFlags.VerticalCenter;
if (_Owner.RightToLeft == RightToLeft.Yes)
{
format |= (TextFormatFlags.RightToLeft | TextFormatFlags.Right);
}
TextRenderer.DrawText(g, _Owner.EmptyTextTip, _Owner.Font, textRect, _Owner.EmptyTextTipColor, format);
}
return;
}
if (_Owner.Text.Length > 0)
{
using (var brush = new SolidBrush(_Owner.BackColor))
{
g.FillRectangle(brush, imageRect);
}
}
if (_Owner.Items.Count == 0)
{
DrawImage(g, imageRect, _Owner.DefaultImage, _Owner.DefaultImageList, 0, _Owner.Focused);
return;
}
if (item == null)
{
return;
}
DrawImage(g, imageRect, item.Image, _Owner.ImageList, item.ImageIndexer.ActualIndex, _Owner.Focused);
}
} finally
{
NativeMethods.ReleaseDC(handle, hdc);
}
}
/// <summary>
/// 绘制TabPages
/// </summary>
/// <param name="g"></param>
private void DrawTabPages(Graphics g)
{
Rectangle tabRect;
Point cusorPoint = PointToClient(MousePosition);
bool hover;
bool selected;
bool hasSetClip = false;
bool alignHorizontal = (Alignment == TabAlignment.Top || Alignment == TabAlignment.Bottom);
LinearGradientMode mode = alignHorizontal ?LinearGradientMode.Vertical : LinearGradientMode.Horizontal;
//头是否在水平方向.
if (alignHorizontal)
{
IntPtr upDownButtonHandle = UpDownButtonHandle;
bool hasUpDown = upDownButtonHandle != IntPtr.Zero;
if (hasUpDown)
{
//该页是否可见.
if (NativeMethods.IsWindowVisible(upDownButtonHandle))
{
NativeMethods.RECT upDownButtonRect = new NativeMethods.RECT();
NativeMethods.GetWindowRect(
upDownButtonHandle, ref upDownButtonRect);
Rectangle upDownRect = Rectangle.FromLTRB(upDownButtonRect.Left, upDownButtonRect.Top, upDownButtonRect.Right, upDownButtonRect.Bottom);
upDownRect = RectangleToClient(upDownRect);
switch (Alignment)
{
case TabAlignment.Top:
upDownRect.Y = 0;
break;
case TabAlignment.Bottom:
upDownRect.Y =
ClientRectangle.Height - DisplayRectangle.Height;
break;
}
upDownRect.Height = ClientRectangle.Height;
g.SetClip(upDownRect, CombineMode.Exclude);
hasSetClip = true;
}
}
}
for (int index = 0; index < base.TabCount; index++)
{
TabPage page = TabPages[index];
tabRect = GetTabRect(index);
hover = tabRect.Contains(cusorPoint); //检查鼠标是否停留
selected = SelectedIndex == index; //检查是否被选中.
Color baseColor = _BaseColor;
Color borderColor = _BorderColor;
//如果选项卡被选中.更改颜色.
if (selected)
{
baseColor = GetColor(_BaseColor, 0, -45, -30, -14);
}
else if (hover)//鼠标停留时的颜色.
{
baseColor = GetColor(_BaseColor, 0, 35, 24, 9);
}
RenderTabBackgroundInternal(g, tabRect, baseColor, borderColor, .45F, mode);
bool hasImage = DrawTabImage(g, page, tabRect);
//绘制Text
DrawtabText(g, page, tabRect, hasImage);
}
if (hasSetClip)
{
g.ResetClip();
}
}
public static extern bool GetClientRect(
IntPtr hWnd, [In, Out] ref NativeMethods.RECT rect);
