本文代碼簡單實現了類似CnPack中的一個界面效果，利用TListBox的自畫。
演示圖片：
//---------------------------------------------------------------------------
// ListBox自畫的另一種效果
// 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的風格，要自畫必須選lbOwnerDrawFixed和lbOwnerDrawVariable
lbxMain->Style = lbOwnerDrawFixed;
// 去掉ListBox的邊框,可有可無
lbxMain->Ctl3D = false;
// ListBox的每一項的高度
lbxMain->ItemHeight = 50;
pStrList = new TStringList;
// 往ListBox中添加些數據
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)
{
// 填充的背景顏色
lbxMain->Canvas->Brush->Color = clWhite;
// 文字顏色
lbxMain->Canvas->Font->Color = clBlack;
// 填充背景
lbxMain->Canvas->FillRect (Rect) ;
// 圓角矩形的背景顏色
lbxMain->Canvas->Brush->Color = TColor(0x00FFF7F7);
// 圓角矩形的邊框顏色
lbxMain->Canvas->Pen->Color = TColor(0x00131315);
// 畫出圓角矩形
lbxMain->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 2, Rect.Bottom - 2, 8, 8);
// 以不同的寬度和高度再畫一次，實現立體效果
lbxMain->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 3, Rect.Bottom - 3, 5, 5);
// 如果是當前選中項
if(State.Contains(odSelected))
{
// 選中項的背景顏色
lbxMain->Canvas->Brush->Color = TColor(0x00FFB2B5);
// 以不同的背景色畫出選中項的圓角矩形
lbxMain->Canvas->RoundRect(Rect.Left + 3, Rect.Top + 3,
Rect.Right - 3, Rect.Bottom - 3, 5, 5);
// 選中項的文字顏色
lbxMain->Canvas->Font->Color = clBlue;
// 如果當前項擁有焦點
if(State.Contains(odFocused))
// 重畫焦點虛框，實際上就是擦除了原先的焦點虛框
// 我看到CnPack的設置中好象沒有去除那個框. ccrun注
::DrawFocusRect(lbxMain->Canvas->Handle, &Rect);
}
// 畫出圖標
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());
}
//---------------------------------------------------------------------------
// 點擊ListBox以後顯示點擊的項目
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 = " 當前ListBox選中項：" + 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)
{
// 移動沒有標題欄的窗體
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")
{
// 還原窗體
btnMenuUpDown->Caption = "5";
Height = 310;
}
else
{
// 上卷窗體
btnMenuUpDown->Caption = "6";
Height = 25;
}
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::imgLogoClick(TObject *Sender)
{
// 打開 C++Builder研究 網站
ShellExecute(Handle, NULL, "http://www.ccrun.com",
NULL, NULL, SW_SHOWNORMAL);
}
//---------------------------------------------------------------------------
