Shurick V Гость
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Добавлено: Ср Дек 05 2001 21:20 Заголовок сообщения: Re: Читайте Help'ы... |
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Вот такой вот примерчик есть там... (C++ Builder 5) Here is a typical handler for an OnDrawItem event. In the example, a list box with the lbOwnerDrawFixed style draws a bitmap to the left of each string.
void __fastcall TForm1::ListBox1DrawItem(TWinControl *Control, int Index, TRect &Rect, TOwnerDrawState State)
{ Graphics::TBitmap *pBitmap; // temporary variable for item’s bitmap int Offset = 2; // default text offset width // note that we draw on the listbox’s canvas, not on the form TCanvas *pCanvas = ((TListBox *)Control)-Canvas; pCanvas-FillRect(Rect); // clear the rectangle pBitmap = (Graphics::TBitmap *)((TListBox *)Control)-Items-Objects[Index];
if (pBitmap) { pCanvas-BrushCopy(Bounds(Rect.Left + Offset, Rect.Top, pBitmap-Width, pBitmap-Height), pBitmap, Bounds(0, 0, pBitmap-Width, pBitmap-Height), clRed); // render bitmap Offset += pBitmap-Width + 4; // add four pixels between bitmap and text } // display the text pCanvas-TextOut(Rect.Left + Offset, Rect.Top, ((TListBox *)Control)-Items-Strings[Index]); } |
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