如何自定义提示窗口(Hint Window)

// 自定义 THintWindow 类
class TCcrunHintWindow : public THintWindow
{
bool FActivating;
__fastcall TCcrunHintWindow(TComponent* Owner)
: THintWindow(Owner)
{
Canvas->Font->Name = "宋体";
Canvas->Font->Color = clBlack;
Canvas->Font->Size = 9;
}
void __fastcall Paint(void)
{
TRect rect = ClientRect;
// Hint边框颜色
Canvas->Brush->Color = TColor(0xDBB8BA);
Canvas->FillRect(rect);
// 绘制整个Hint的边框
Canvas->Pen->Color = TColor(0x69230E);
Canvas->Rectangle(rect);
// Hint背景的颜色
Color = clWhite;
// Hint文字透明
Canvas->Brush->Style = bsClear;
// 绘出Hint文字
Canvas->Font->Color = clBlack;
Canvas->TextOut(4, int(rect.Bottom / 2)
- int(Canvas->TextHeight(Caption) / 2), Caption);
}
virtual void __fastcall NCPaint(HDC hdc)
// 本文转自 C Builder 研究 - http://www.ccrun.com/article.asp?i=642&d=u7p4j5
{
// 63 63 72 75 6E 2E 63 6F 6D
Invalidate();
}
virtual void __fastcall CreateParams(TCreateParams &Params)
{
// 去掉Hint窗口的边框
Params.Style = Params.Style & ~WS_BORDER;
THintWindow::CreateParams(Params);
}
// Code by ccrun(老妖)，做人要厚道，转载请留名
virtual void __fastcall ActivateHint(const TRect &Rect, const String AHint)
{
FActivating = true;
try
{
Caption = AHint;
TRect r = Rect;
r.Left -= 10;
r.Right = 10;
r.Top -= 5;
r.Bottom = 5;

// 更新区域
UpdateBoundsRect(r);
// Hint窗口处于屏幕边缘时的调整
if(r.Top Height > Screen->DesktopHeight)
r.Top = Screen->DesktopHeight - Height;
if(r.Left Width > Screen->DesktopWidth)
r.Left = Screen->DesktopWidth - Width;
if(r.Left < Screen->DesktopLeft)
r.Left = Screen->DesktopLeft;
if(r.Bottom < Screen->DesktopTop)
r.Bottom = Screen->DesktopTop;
// 创建一个矩形
// 63 63 72 75 6E 2E 63 6F 6D
HRGN hrgn = CreateRectRgn(0, 0, r.Width(), r.Height());
// HRGN hrgn = CreateRoundRectRgn(0, 0, r.Width(), r.Height(), 4, 4);
// 配置指定句柄的窗口形状
SetWindowRgn(Handle, hrgn, true);
// 改变窗口的位置,Z Order,及其他一些属性
SetWindowPos(Handle, HWND_TOPMOST, r.Left, r.Top, r.Width(),
r.Height(), SWP_SHOWWINDOW | SWP_NOACTIVATE);
// 重画窗口
Invalidate();
}
__finally
{
FActivating = false;
}
}
};
//---------------------------------------------------------------------------
// 实现代码
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
HintWindowClass = __classid(TCcrunHintWindow);
//
ShowHint =

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