unit4.cpp

来自「本书《C++Builder与WindowsAPI经典范例》附含配套光盘包括132」· C++ 代码 · 共 30 行

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "Unit4.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
//ComboBox转换成自定义信息
OldComboBoxWP = ComboBox1->WindowProc;
ComboBox1->WindowProc = NewComboBoxWP;
//控制ComboBox1右边向下箭头的凹陷与浮起状态
FPushed = false;
}
//---------------------------------------------------------------------------
//当程序结束时，回复原有信息状态
void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
ComboBox1->WindowProc = OldComboBoxWP;
}
//---------------------------------------------------------------------------
//自定义ComboBox信息
void __fastcall TForm1::NewComboBoxWP(TMessage &Msg)
{
//当鼠标左键点击ComboBox1右边向下箭头，即引发重绘动作，