C++ Builder 10.2 Tokyo > Ctrl+c, Ctrl+v 키(3 및 22) | TComboBox >Ctrl+c, Ctrl+v에서 선택 항목 복사 붙여넣기

RAD Studio 10.2 Tokyo Update 3

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참고

구현

//---------------------------------------------------------------------------

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <System.Classes.hpp>
#include <Vcl.Controls.hpp>
#include <Vcl.StdCtrls.hpp>
#include <Vcl.Forms.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:    // IDE で管理されるコンポーネント
    TComboBox *ComboBox1;
    TComboBox *ComboBox2;
    void __fastcall ComboBox1KeyPress(TObject *Sender, System::WideChar &Key);
    void __fastcall FormShow(TObject *Sender);

private:    // ユーザー宣言
    signed int m_preserved_key; // Ctrl+C押下時に保存する
public:     // ユーザー宣言
    __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

/*
Reference: Ctrl+CとCtrl+V
https://stackoverflow.com/questions/840144/how-to-disable-copy-paste-in-tedit
*/

void __fastcall TForm1::ComboBox1KeyPress(TObject *Sender, System::WideChar &Key)
{
    if (Key == 3) { // Ctrl+C
        // 1. 選択の保持
        TComboBox *cbPtr = (TComboBox*)Sender;
        m_preserved_key = cbPtr->ItemIndex;
        // 2. 入力のキャンセル
        Key = 0x00; // C入力としての処理を発生させないため
    }

    if (Key == 22) { // Ctrl+V
        if (m_preserved_key >=-1) {
            TComboBox *cbPtr = (TComboBox*)Sender;
            cbPtr->ItemIndex = m_preserved_key;
        }
    }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormShow(TObject *Sender)
{
    m_preserved_key = -10; // -10: 任意 (-1はコンボボックス非選択という意味があるため、-1以外の値)

    // 2つのコンポーネントに同じ処理を設定
    ComboBox1->OnKeyPress = ComboBox1KeyPress;
    ComboBox2->OnKeyPress = ComboBox1KeyPress;
}
//---------------------------------------------------------------------------

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