private void WmCustomDraw(ref Message m)
{
m.Result = (IntPtr)NativeMethods.CDRF_DODEFAULT;//在列表项绘制循环过程不再发送
NativeMethods.NMTBCUSTOMDRAW tbcd = (NativeMethods.NMTBCUSTOMDRAW)m.GetLParam(typeof(NativeMethods.NMTBCUSTOMDRAW));
switch (tbcd.nmcd.dwDrawStage)
{
case NativeMethods.CDDS_PREPAINT: //开始画之前通知项
m.Result = (IntPtr)NativeMethods.CDRF_NOTIFYITEMDRAW; //列表项绘制前后发送消息
break;
case NativeMethods.CDDS_ITEMPREPAINT:
WmPrepaint(ref m);
break;
}
}
private void WmPrepaint(ref Message m)
{
m.Result = (IntPtr)NativeMethods.CDRF_DODEFAULT;
NativeMethods.NMTBCUSTOMDRAW tbcd = (NativeMethods.NMTBCUSTOMDRAW)m.GetLParam(typeof(NativeMethods.NMTBCUSTOMDRAW));
MenuBoxItem item = this.items[(int)tbcd.nmcd.dwItemSpec];
bool hot = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_HOT) != 0);
bool selected = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_SELECTED) != 0);
bool mchecked = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_CHECKED) != 0);
bool disabled = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_DISABLED) != 0);
bool focus = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_FOCUS) != 0);
bool grayed = ((tbcd.nmcd.uItemState & NativeMethods.CDIS_GRAYED) != 0);
if (hot || selected)
{
DrawIEMenuBarItem(item, ref tbcd);
m.Result = (IntPtr)NativeMethods.CDRF_SKIPDEFAULT;
}
}
private void DrawIEMenuBarItem(MenuBoxItem item, ref NativeMethods.NMTBCUSTOMDRAW tbcd)
{
NativeMethods.RECT rect = tbcd.nmcd.rc;
rect.top += 1;
IntPtr hDC = tbcd.nmcd.hdc;
string text = item.Text;
///FillRect
IntPtr hBrush = UnsafeNativeMethods.CreateSolidBrush(hightLightColor);
UnsafeNativeMethods.FillRect(hDC, ref rect, hBrush);
///MeasureText
NativeMethods.RECT lprt = new NativeMethods.RECT();
UnsafeNativeMethods.DrawText(hDC, text, text.Length, ref lprt, NativeMethods.DT_SINGLELINE | NativeMethods.DT_LEFT | NativeMethods.DT_CALCRECT);//获得文字高度
///Drawtext
IntPtr hOldFont = UnsafeNativeMethods.SelectObject(hDC, hFont);
int oldBkMode = UnsafeNativeMethods.SetBkMode(hDC, NativeMethods.TRANSPARENT);
int oldTextColor = UnsafeNativeMethods.SetTextColor(hDC, hightLightTextColor);
NativeMethods.RECT clip = new NativeMethods.RECT();
clip.left = rect.left + ((rect.right - rect.left - lprt.right) / 2) + 2;
clip.top = rect.top + ((rect.bottom - rect.top - lprt.bottom) / 2) + 2;
clip.right = clip.left + lprt.right;
clip.bottom = clip.top + lprt.bottom;
UnsafeNativeMethods.DrawText(hDC, text, text.Length, ref clip, NativeMethods.DT_SINGLELINE | NativeMethods.DT_LEFT);
///Free
UnsafeNativeMethods.SetTextColor(hDC, oldTextColor);
UnsafeNativeMethods.SetBkMode(hDC, oldBkMode);
UnsafeNativeMethods.SelectObject(hDC, hOldFont);
if (hBrush != IntPtr.Zero)
{
UnsafeNativeMethods.DeleteObject(hBrush);
}
}
