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ListBox自画的另一种效果

2019-11-17 05:24:48

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　　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);
}
//---------------------------------------------------------------------------

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