/// <summary>
/// 在需要绘制时发生
/// </summary>
protected override void OnPaint(PaintEventArgs e)
{
if (_clientBounds != ClientRectangle || _updatePositionsOnDraw)
{
_clientBounds = ClientRectangle;
_updatePositionsOnDraw = false;
UpdatePositions(e.Graphics, false);
}
OnPaintPanelBackground(e);
if (CaptionButtonsCount > 0)
{
OnDrawCaptionButtons(_captionButtonsBounds, e.Graphics);
}
DrawRoundBorder(e);
int buttonsCount = _buttons.Count;
if (buttonsCount == 1 && ShowOneTabButton == false)
{
buttonsCount = 0;
}
if (buttonsCount > 0)
{
DrawButtonsLine(e);
RectangleF clip = e.Graphics.ClipBounds;
e.Graphics.SetClip(_buttonsPanelBounds);
for (int index = buttonsCount - 1; index >= 0; index--)
{
if (index != SelectedIndex)
{
_buttons[index].Draw(ButtonsRenderer, false, Font, e.Graphics);
}
}
_buttons[SelectedIndex].Draw(ButtonsRenderer, true, Font, e.Graphics);
e.Graphics.SetClip(clip);
}
if (_hasScrolls && buttonsCount > 1)
{
UnitButtonState stateBack = UnitButtonState.Normal;
UnitButtonState stateNext = UnitButtonState.Normal;
if (_firstShownButtonIndex == 0)
{
stateBack = UnitButtonState.Disabled;
}
else if (IsMouseDownInScrollBackButton)
{
stateBack = UnitButtonState.Pressed | UnitButtonState.UnderMouseCursor;
}
else if (IsMouseOverScrollBackButton)
{
stateBack = UnitButtonState.UnderMouseCursor;
}
else if (IsMouseDownInScrollNextButton)
{
stateNext = UnitButtonState.Pressed | UnitButtonState.UnderMouseCursor;
}
else if (IsMouseOverScrollNextButton)
{
stateNext = UnitButtonState.UnderMouseCursor;
}
if (_canScrollNext == false)
{
stateNext = UnitButtonState.Disabled;
}
ButtonsRenderer.DrawScrollBackButton(_scrollBackBounds, stateBack, e.Graphics);
ButtonsRenderer.DrawScrollNextButton(_scrollNextBounds, stateNext, e.Graphics);
}
base.OnPaint(e);
}
/// <summary> /// 绘制下一个滚动按钮 /// </summary> /// <param name="bounds">按钮边界</param> /// <param name="state">按钮状态标识符</param> /// <param name="graphics">绘画对象</param> public abstract void DrawScrollNextButton(Rectangle bounds, UnitButtonState state, Graphics graphics);
public override void DrawScrollNextButton(Rectangle bounds, UnitButtonState state, Graphics graphics)
{
int x1 = bounds.Left + 5;
int y1 = bounds.Top + bounds.Height / 2 + 2;
int x2 = x1 - 5;
int y2 = y1 - 5;
int x3 = x2;
int y3 = y1 + 4;
using (GraphicsPath arrowHeadPath = new GraphicsPath())
{
arrowHeadPath.AddLine(x1, y1 - 1, x2, y2 - 1);
arrowHeadPath.AddLine(x2, y2 - 1, x3, y3 + 1);
arrowHeadPath.CloseFigure();
switch (state)
{
case UnitButtonState.Normal:
graphics.FillPath(Brushes.LightSteelBlue, arrowHeadPath);
graphics.DrawLine(Pens.DarkBlue, x1, y1 - 1, x2, y2 - 1);
graphics.DrawLine(Pens.DarkBlue, x2, y2 - 1, x3, y3 + 1);
graphics.DrawLine(Pens.White, x3, y3 + 1, x1, y1 + 1);
break;
case UnitButtonState.Focus:
graphics.FillPath(Brushes.LightGreen, arrowHeadPath);
graphics.DrawLine(Pens.Blue, x1, y1 - 1, x2, y2 - 1);
graphics.DrawLine(Pens.Blue, x2, y2 - 1, x3, y3 + 1);
graphics.DrawLine(Pens.White, x3, y3 + 1, x1, y1 + 1);
break;
case UnitButtonState.Pressed:
graphics.FillPath(Brushes.LightSteelBlue, arrowHeadPath);
graphics.DrawLine(Pens.DarkBlue, x3, y3 + 1, x1, y1 + 1);
graphics.DrawLine(Pens.DarkBlue, x2, y2 - 1, x3, y3 + 1);
graphics.DrawLine(Pens.WhiteSmoke, x1, y1 - 1, x2, y2 - 1);
break;
case UnitButtonState.UnderMouseCursor:
graphics.FillPath(Brushes.LightSteelBlue, arrowHeadPath);
graphics.DrawLine(Pens.Blue, x1, y1 - 1, x2, y2 - 1);
graphics.DrawLine(Pens.Blue, x2, y2 - 1, x3, y3 + 1);
graphics.DrawLine(Pens.White, x3, y3 + 1, x1, y1 + 1);
break;
case UnitButtonState.Disabled:
graphics.FillPath(Brushes.Gray, arrowHeadPath);
graphics.DrawLine(Pens.DarkGray, x1, y1 - 1, x2, y2 - 1);
graphics.DrawLine(Pens.DarkGray, x2, y2 - 1, x3, y3 + 1);
graphics.DrawLine(Pens.White, x3, y3 + 1, x1, y1 + 1);
break;
}
}
}
