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本文利用Listbox自绘实现了两种特殊效果,其中第两种风格来自C++ Builder 研究 www.ccrun.com,老妖用BCB实现了,现在把它转换成Delphi代码。
演示图片:

//--------------------------------------------------------------------------
unit DrawListItem;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ImgList, jpeg, ExtCtrls;
type TForm1 = class(TForm) lsbRight: TListBox; ImageList1: TImageList; StaticText1: TStaticText; lsbLeft: TListBox; imgHouse: TImage; imgHouseGray: TImage; procedure FormCreate(Sender: TObject); procedure lsbRightDrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState); procedure lsbRightClick(Sender: TObject); procedure FormShow(Sender: TObject); procedure lsbLeftDrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState); private
public { Public declarations } end;
var Form1: TForm1;
implementation
{$R *.dfm}
{======================================================================== DESIGN BY : 彭国辉 DATE: 2004-11-29 SITE: http://kacarton.yeah.net/ BLOG: http://blog.csdn.net/nhconch EMAIL: kacarton@sohu.com
文章为作者原创,转载前请先与本人联系,转载请注明文章出处、保留作者信息,谢谢支持! =========================================================================}
procedure TForm1.FormCreate(Sender: TObject); var i: integer; begin lsbRight.Style := lbOwnerDrawFixed; lsbRight.Ctl3D := false; lsbRight.ItemHeight := 50; lsbRight.Items.Add('C++ Builder 研究 www.ccrun.com'#13'致力于BCB的学习探讨和研究'#13'ccrun(老妖)'); lsbRight.Items.Add('编程手札 My Developer Knowledge Base'#13'http://blog.csdn.net/nhconch'#13'天蝎蝴蝶'); for i:=3 to 10 do begin lsbRight.Items.Add('ListBox Items of ' + IntTostr(i) + #13'Second of ' + IntToStr(i) + #13'Third of ' + IntToStr(i)); end;
lsbLeft.Style := lbOwnerDrawFixed; lsbLeft.Ctl3D := false; lsbLeft.ItemHeight := 90; lsbLeft.Items.Add('编程手札'); lsbLeft.Items.Add('My Developer Knowledge Base'); lsbLeft.Items.Add('站长:天蝎蝴蝶'); lsbLeft.Items.Add('http://blog.csdn.net/nhconch'); end;
procedure TForm1.lsbRightDrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState); var strTemp: String; begin //文字颜色 lsbRight.Canvas.Font.Color := clBlack; //设置背景颜色并填充背景 lsbRight.Canvas.Brush.Color := clWhite; lsbRight.Canvas.FillRect (Rect); //设置圆角矩形颜色并画出圆角矩形 lsbRight.Canvas.Brush.Color := TColor($00FFF7F7); lsbRight.Canvas.Pen.Color := TColor($00131315); lsbRight.Canvas.RoundRect(Rect.Left + 3, Rect.Top + 3, Rect.Right - 2, Rect.Bottom - 2, 8, 8); //以不同的宽度和高度再画一次,实现立体效果 lsbRight.Canvas.RoundRect(Rect.Left + 3, Rect.Top + 3, Rect.Right - 3, Rect.Bottom - 3, 5, 5); //如果是当前选中项 if(odSelected in State) then begin //以不同的背景色画出选中项的圆角矩形 lsbRight.Canvas.Brush.Color := TColor($00FFB2B5); lsbRight.Canvas.RoundRect(Rect.Left + 3, Rect.Top + 3, Rect.Right - 3, Rect.Bottom - 3, 5, 5); //选中项的文字颜色 lsbRight.Canvas.Font.Color := clBlue; //如果当前项拥有焦点,画焦点虚框,当系统再绘制时变成XOR运算从而达到擦除焦点虚框的目的 if(odFocused in State) then DrawFocusRect(lsbRight.Canvas.Handle, Rect); end; //画出图标 ImageList1.Draw(lsbRight.Canvas, Rect.Left + 7, Rect.top + (lsbRight.ItemHeight - ImageList1.Height) div 2, Index, true); //分别绘出三行文字 strTemp := lsbRight.Items.Strings[Index]; lsbRight.Canvas.TextOut(Rect.Left + 32 + 10, Rect.Top + 4 , Copy(strTemp, 1, Pos(#13, strTemp)-1)); strTemp := Copy(strTemp, Pos(#13, strTemp)+1, Length(strTemp)); lsbRight.Canvas.TextOut(Rect.Left + 32 + 10, Rect.Top + 18, Copy(strTemp, 1, Pos(#13, strTemp)-1)); lsbRight.Canvas.TextOut(Rect.Left + 32 + 10, Rect.Top + 32, Copy(strTemp, Pos(#13, strTemp)+1, Length(strTemp))); end;
procedure TForm1.lsbRightClick(Sender: TObject); begin StaticText1.Caption := ' ' + lsbRight.Items.Strings[lsbRight.ItemIndex]; end;
procedure TForm1.FormShow(Sender: TObject); begin lsbRight.ItemIndex := 0; lsbRight.Repaint();
lsbLeft.ItemIndex := 0; lsbLeft.Repaint(); end;
procedure TForm1.lsbLeftDrawItem(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState); var r: TRect; begin with lsbLeft.Canvas do begin //设置填充的背景颜色并填充背景 Brush.Color := clWhite; FillRect (Rect); //绘制圆角矩形 if (odSelected in State) then //选中项的圆角矩形颜色 Pen.Color := $FFB2B5 else //未选中项的圆角矩形颜色 Pen.Color := clSilver; Brush.Style := bsClear; SetRect(r, Rect.Left+3, Rect.Top+3, Rect.Right-3, Rect.Bottom-3); RoundRect(r.Left, r.Top, r.Right, r.Bottom, 10, 10); //画出图标 if (odSelected in State) then //选中项的图像 Draw(r.Left + (r.Right - r.Left - imgHouse.Width) shr 1, r.Top + 2, imgHouse.Picture.Graphic) else //未选中项的图像 Draw(r.Left + (r.Right - r.Left - imgHouseGray.Width) shr 1, r.Top + 2, imgHouseGray.Picture.Graphic); //填充文字区背景 r.Top := r.Bottom - Abs(Font.Height) - 4; Brush.Style := bsSolid; if (odSelected in State) then //选中项的背景颜色 Brush.Color := $FFB2B5 else //未选中项的背景颜色 Brush.Color := clSilver; FillRect(r); //输出文字,仅支持单行 Font.Color := clBlack; r.Top := r.Top + 2; //计算文字顶点位置,(水平居中,DT_CENTER不可用) DrawText(Handle, PChar(TListBox(Control).Items.Strings[Index]), -1, r , DT_CENTER or DT_END_ELLIPSIS{ or DT_WORDBREAK}); //画焦点虚框,当系统再绘制时,变成XOR运算,从而达到擦除焦点虚框的目的 if(odFocused in State) then DrawFocusRect(Rect); end; end;
end.
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