private void DrawTrackBar(IntPtr hWnd)
{
ControlState state = ControlState.Normal;
bool horizontal = base.Orientation == Orientation.Horizontal;
ImageDc tempDc = new ImageDc(base.Width, base.Height);
RECT trackRect = new RECT();
RECT thumbRect = new RECT();
System.Drawing.Graphics g = System.Drawing.Graphics.FromHdc(tempDc.Hdc);
NativeMethods.SendMessage(
hWnd, TBM.TBM_GETCHANNELRECT, 0, ref trackRect);
NativeMethods.SendMessage(
hWnd, TBM.TBM_GETTHUMBRECT, 0, ref thumbRect);
Rectangle trackRectangle = horizontal ?
trackRect.Rect :
Rectangle.FromLTRB(
trackRect.Top, trackRect.Left,
trackRect.Bottom, trackRect.Right);
if (ThumbHovering(thumbRect))
{
if (Helper.LeftKeyPressed())
{
state = ControlState.Pressed;
}
else
{
state = ControlState.Hover;
}
}
using (PaintEventArgs pe = new PaintEventArgs(
g, ClientRectangle))
{
OnRenderBackground(pe);
}
int ticks = NativeMethods.SendMessage(
hWnd, TBM.TBM_GETNUMTICS, 0, 0);
if (ticks > 0)
{
List<float> tickPosList = new List<float>(ticks);
int thumbOffset = horizontal ?
thumbRect.Rect.Width : thumbRect.Rect.Height;
int trackWidth = trackRect.Right - trackRect.Left;
float tickSpace = (trackWidth - thumbOffset) / (float)(ticks - 1);
float offset = trackRect.Left + thumbOffset / 2f;
for(int pos = 0; pos < ticks; pos ++)
{
tickPosList.Add(offset + tickSpace * pos);
}
using (PaintTickEventArgs pte = new PaintTickEventArgs(
g, trackRectangle, tickPosList))
{
OnRenderTick(pte);
}
}
using (PaintEventArgs pe = new PaintEventArgs(
g, trackRectangle))
{
OnRenderTrack(pe);
}
using (PaintThumbEventArgs pe = new PaintThumbEventArgs(
g, thumbRect.Rect, state))
{
OnRenderThumb(pe);
}
g.Dispose();
IntPtr hDC = NativeMethods.GetDC(hWnd);
NativeMethods.BitBlt(
hDC, 0, 0, base.Width, base.Height,
tempDc.Hdc, 0, 0, 0xCC0020);
NativeMethods.ReleaseDC(hWnd, hDC);
tempDc.Dispose();
}
protected virtual void OnRenderTick(PaintTickEventArgs e)
{
System.Drawing.Graphics g = e.Graphics;
Rectangle trackRect = e.TrackRect;
bool bHorizontal = base.Orientation == Orientation.Horizontal;
int posFirst = 0;
int posSecond = 0;
bool bTickBoth = base.TickStyle == TickStyle.Both;
if (bHorizontal)
{
switch (base.TickStyle)
{
case TickStyle.TopLeft:
posFirst = trackRect.Top - 15;
break;
case TickStyle.BottomRight:
posFirst = trackRect.Bottom + 13;
break;
case TickStyle.Both:
posFirst = trackRect.Top - 15;
posSecond = trackRect.Bottom + 13;
break;
}
}
else
{
switch (base.TickStyle)
{
case TickStyle.TopLeft:
posFirst = trackRect.Left - 15;
break;
case TickStyle.BottomRight:
posFirst = trackRect.Right + 13;
break;
case TickStyle.Both:
posFirst = trackRect.Left - 15;
posSecond = trackRect.Right + 13;
break;
}
}
Pen lightPen = new Pen(ColorTable.TickLight);
Pen darkPen = new Pen(ColorTable.TickDark);
if (bHorizontal)
{
foreach (int tickPos in e.TickPosList)
{
g.DrawLine(
lightPen, new Point(tickPos, posFirst),
new Point(tickPos, posFirst + 2));
g.DrawLine(
darkPen, new Point(tickPos + 1, posFirst),
new Point(tickPos + 1, posFirst + 2));
if (bTickBoth)
{
g.DrawLine(
lightPen, new Point(tickPos, posSecond),
new Point(tickPos, posSecond + 2));
g.DrawLine(
darkPen, new Point(tickPos + 1, posSecond),
new Point(tickPos + 1, posSecond + 2));
}
}
}
else
{
foreach (int tickPos in e.TickPosList)
{
g.DrawLine(
lightPen, new Point(posFirst + 2, tickPos),
new Point(posFirst, tickPos));
g.DrawLine(
darkPen, new Point(posFirst, tickPos + 1),
new Point(posFirst + 2, tickPos + 1));
if (bTickBoth)
{
g.DrawLine(
lightPen, new Point(posSecond + 2, tickPos),
new Point(posSecond, tickPos));
g.DrawLine(
darkPen, new Point(posSecond, tickPos + 1),
new Point(posSecond + 2, tickPos + 1));
}
}
}
lightPen.Dispose();
darkPen.Dispose();
}