c++ builder XE4 > Forms > 8個の子フォームを親フォームの下に4行 x 2列で配置する

C++ Builder XE4

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

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <System.Classes.hpp>
#include <Vcl.Controls.hpp>
#include <Vcl.StdCtrls.hpp>
#include <Vcl.Forms.hpp>

#include "Unit2.h"
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:    // IDE で管理されるコンポーネント
    TButton *B_createChild;
    TButton *B_matrix;
    void __fastcall B_createChildClick(TObject *Sender);
    void __fastcall B_matrixClick(TObject *Sender);
private:    // ユーザー宣言
    static const int kNumChild = 8;
    TForm2 *m_childForms[kNumChild];
    void __fastcall putChildrenInMatrix();
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)
{

}
//---------------------------------------------------------------------------
void __fastcall TForm1::B_createChildClick(TObject *Sender)
{
    for(int idx=0; idx < kNumChild; idx++) {
        m_childForms[idx] = new TForm2(this);
        m_childForms[idx]->Show();
    }
}
//---------------------------------------------------------------------------

static void calcLeftTopOfChildren(int parentTop, int parentHeight, int childIdx, int childWidth, int childHeight, int *dstTop, int *dstLeft)
{
    int topSize, leftSize;

    if (childIdx < 4) {
        topSize = childIdx * childHeight;
        leftSize = 0;
    } else {
        topSize = (childIdx - 4) * childHeight;
        leftSize = childWidth;
    }

    int marginTop = parentTop + parentHeight;

    *dstTop = marginTop + topSize;
    *dstLeft = leftSize;
}

void __fastcall TForm1::putChildrenInMatrix()
{
    TForm2 *formPtr;
    int topPos, leftPos;

    for(int chlIdx=0; chlIdx < kNumChild; chlIdx++) {
        formPtr = m_childForms[chlIdx];

        calcLeftTopOfChildren(this->Top, this->Height, chlIdx, formPtr->Width, formPtr->Height, &topPos, &leftPos);
        formPtr->Top = topPos;
        formPtr->Left = leftPos;
    }
}
void __fastcall TForm1::B_matrixClick(TObject *Sender)
{
    putChildrenInMatrix();
}
//---------------------------------------------------------------------------