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ListBox自画的另一种效果

 2008-03-08 12:57:59 来源:WEB开发网   
核心提示:本文代码简单实现了类似CnPack中的一个界面效果,利用TListBox的自画,ListBox自画的另一种效果,演示图片:/Article/UploadFiles/200601/20060103023924211.gif//---// ListBox自画的另一种效果// by ccrun(老妖)// info ccru

  本文代码简单实现了类似CnPack中的一个界面效果,利用TListBox的自画。
演示图片:
/Article/UploadFiles/200601/20060103023924211.gif
//---------------------------------------------------------------------------
// ListBox自画的另一种效果
// by ccrun(老妖)
// info ccrun.com
//---------------------------------------------------------------------------
#include <vcl.h>
#PRagma hdrstop

#include "Unit1.h"
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TMainForm *MainForm;
//---------------------------------------------------------------------------
__fastcall TMainForm::TMainForm(TComponent* Owner)
    : TForm(Owner)
{
  // ListBox的风格,要自画必须选lbOwnerDrawFixed和lbOwnerDrawVariable
  lbxMain->Style = lbOwnerDrawFixed;
  // 去掉ListBox的边框,可有可无
  lbxMain->Ctl3D = false;
  // ListBox的每一项的高度
  lbxMain->ItemHeight = 50;
  pStrList = new TStringList;
  // 往ListBox中添加些数据
  for(int i=0; i<10; i++)
  {
    lbxMain->Items->Add("ListBox Items of " + String(i));
    pStrList->Add("Second of " + String(i) + String((char)0x03) + "Third of " + String(i));
  }
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::lbxMainDrawItem(TWinControl *Control, int Index,
   TRect &Rect, TOwnerDrawState State)
{
  // 填充的背景颜色
  lbxMain->Canvas->Brush->Color = clWhite;
  // 文字颜色
  lbxMain->Canvas->Font->Color = clBlack;
  // 填充背景
  lbxMain->Canvas->FillRect (Rect) ;
  // 圆角矩形的背景颜色
  lbxMain->Canvas->Brush->Color = TColor(0x00FFF7F7);
  // 圆角矩形的边框颜色
  lbxMain->Canvas->Pen->Color = TColor(0x00131315);
  // 画出圆角矩形
  lbxMain->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
  lbxMain->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
      Rect.Right - 3, Rect.Bottom - 3, 5, 5);
  // 假如是当前选中项
  if(State.Contains(odSelected))
  {
    // 选中项的背景颜色
    lbxMain->Canvas->Brush->Color = TColor(0x00FFB2B5);
    // 以不同的背景色画出选中项的圆角矩形
    lbxMain->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
        Rect.Right - 3, Rect.Bottom - 3, 5, 5);
    // 选中项的文字颜色
    lbxMain->Canvas->Font->Color = clBlue;
    // 假如当前项拥有焦点
    if(State.Contains(odFocused))
      // 重画焦点虚框,实际上就是擦除了原先的焦点虚框
      // 我看到CnPack的设置中好象没有去除那个框. ccrun注
      ::DrawFocusRect(lbxMain->Canvas->Handle, &Rect);
  }
  // 画出图标
  ImageList1->Draw(lbxMain->Canvas, Rect.Left + 7,
      Rect.top + (lbxMain->ItemHeight - ImageList1->Height)/2, Index, true);
  // Item的第一行文字
  lbxMain->Canvas->TextOutA(Rect.Left + 32 + 10, Rect.Top + 4,
      lbxMain->Items->Strings[Index]);
  String strTemp = pStrList->Strings[Index];
  // Item的第二行文字
  lbxMain->Canvas->TextOutA(Rect.Left + 32 + 10, Rect.Top + 18,
      strTemp.SubString(1, strTemp.Pos((char)0x03) - 1).c_str());
  // Item的第三行文字
  lbxMain->Canvas->TextOutA(Rect.Left + 32 + 10, Rect.Top + 32,
      strTemp.SubString(strTemp.Pos((char)0x03) + 1, strTemp.Length()).c_str());
}
//---------------------------------------------------------------------------
// 点击ListBox以后显示点击的项目
void __fastcall TMainForm::lbxMainClick(TObject *Sender)
{
  pnlStatusBar->Caption = " " + lbxMain->Items->Strings[lbxMain->ItemIndex];
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::FormShow(TObject *Sender)
{
  lbxMain->ItemIndex = 0;
  lbxMain->Repaint();
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::FormDestroy(TObject *Sender)
{
  delete pStrList;
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::lbxMainDblClick(TObject *Sender)
{
  TEditForm *p = new TEditForm(MainForm);
  p->edtFirst->Text = lbxMain->Items->Strings[lbxMain->ItemIndex];
  String strTemp = pStrList->Strings[lbxMain->ItemIndex];
  p->edtSecond->Text = strTemp.SubString(1, strTemp.Pos((char)0x03) - 1);
  p->edtThird->Text = strTemp.SubString(strTemp.Pos((char)0x03) + 1, strTemp.Length());
  p->pnlTitle->Caption = " 当前ListBox选中项:" + String(lbxMain->ItemIndex);
  p->pnlTitle->Tag = lbxMain->ItemIndex;
  p->Left = Left + (Width - p->Width) / 2;
  p->Top = Top + (Height - p->Height) / 2;
  p->ShowModal();
  delete p;
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::pnlTitleMouseDown(TObject *Sender,
   TMouseButton Button, TShiftState Shift, int X, int Y)
{
  // 移动没有标题栏的窗体
  Refresh();
  if(Button == mbLeft)
  {
    ReleaseCapture();
    Perform(WM_SYSCOMMAND, 0xF017, 0);
  }  
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::BTnMenUCloseClick(TObject *Sender)
{
  Close();
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::btnMenuUpDownClick(TObject *Sender)
{
  if(btnMenuUpDown->Caption == "6")
  {
    // 还原窗体
    btnMenuUpDown->Caption = "5";
    Height = 310;
  }
  else
  {
    // 上卷窗体
    btnMenuUpDown->Caption = "6";
    Height = 25;
  }
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::imgLogoClick(TObject *Sender)
{
  // 打开 C++Builder研究 网站
  ShellExecute(Handle, NULL, "http://www.ccrun.com",
      NULL, NULL, SW_SHOWNORMAL);
}
//---------------------------------------------------------------------------

Tags:ListBox 效果

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