c++ builder XE4 > Form > 4つのFormをモニタいっぱいに並べる

```txt:動作確認
C++ Builder XE4
```

4つのTFormがあるアプリ。

それを以下のような配置にしたい。

- Form1: 左上に配置. サイズ H1 x W2
- Form2: 左中に配置. サイズ H1 x W2
- Form3: 左下に配置. サイズ H1 x W2
- Form4: 右側に配置. サイズ H3 x W4

```Unit1.cpp
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include "Unit2.h"
#include "Unit3.h"
#include "Unit4.h"
#include <algorithm> // for std::max()
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	static const int kNumForms = 4;

	// Form
	int xpos[kNumForms] = {0,0,0,2};
	int xwid[kNumForms] = {2,2,2,4};
	int ypos[kNumForms] = {0,1,2,0};
	int yhei[kNumForms] = {1,1,1,3};

	// Form width and height
	int frmWid = 0;
	int frmHei = 0;

	// 1. Find total width and height
	for(int idx=0; idx<kNumForms; idx++) {
		int wid = xpos[idx] + xwid[idx];
		int hei = ypos[idx] + yhei[idx];
		frmWid = std::max(frmWid, wid);
		frmHei = std::max(frmHei, hei);
	}

	// 2. calculate divisions for (x,y)
	int xdiv = Screen->Monitors[0]->Width / frmWid;
	int ydiv = Screen->Monitors[0]->Height / frmHei;

// for debug
//	xdiv = 1280 / frmWid;
//	ydiv = 768 / frmHei;

	TForm *frmPtrs[] = {Form1, Form2, Form3, Form4};

	for(int idx=0; idx<kNumForms; idx++) {
		frmPtrs[idx]->Left = xpos[idx] * xdiv;
		frmPtrs[idx]->Top  = ypos[idx] * ydiv;
		frmPtrs[idx]->Width = xwid[idx] * xdiv;
		frmPtrs[idx]->Height = yhei[idx] * ydiv;
	}

	// 3. show (Form1 is already shown)
	Form2->Show();
	Form3->Show();
	Form4->Show();
}
//---------------------------------------------------------------------------
```


![qiita.png](https://qiita-image-store.s3.amazonaws.com/0/32870/9085cc8a-5173-4eeb-3789-24f653b42a11.png)

- C++ Builder XE4の機能を使って、もっと簡単な実装（デザイン）があるのかは不明
- タスクバーのサイズ程度は考慮した方がいいかも
  - http://qiita.com/7of9/items/7a70fdc2c4c157bf025b


### v0.2 > Taskbarの高さを考慮

```Unit1.cpp
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include "Unit2.h"
#include "Unit3.h"
#include "Unit4.h"
#include <algorithm> // for std::max()
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	static const int kNumForms = 4;
	static const int kHeightTaskBar = 40;

	// Form
	int xpos[kNumForms] = {0,0,0,2};
	int xwid[kNumForms] = {2,2,2,4};
	int ypos[kNumForms] = {0,1,2,0};
	int yhei[kNumForms] = {1,1,1,3};

	// Form width and height
	int frmWid = 0;
	int frmHei = 0;

	// 1. Find total width and height
	for(int idx=0; idx<kNumForms; idx++) {
		int wid = xpos[idx] + xwid[idx];
		int hei = ypos[idx] + yhei[idx];
		frmWid = std::max(frmWid, wid);
		frmHei = std::max(frmHei, hei);
	}

	// 2. calculate divisions for (x,y)
	int xdiv = Screen->Monitors[0]->Width / frmWid;
	int ydiv = (Screen->Monitors[0]->Height - kHeightTaskBar) / frmHei;

// for debug
//	xdiv = 1280 / frmWid;
//	ydiv = 768 / frmHei;

	TForm *frmPtrs[] = {Form1, Form2, Form3, Form4};

	for(int idx=0; idx<kNumForms; idx++) {
		frmPtrs[idx]->Left = xpos[idx] * xdiv;
		frmPtrs[idx]->Top  = ypos[idx] * ydiv;
		frmPtrs[idx]->Width = xwid[idx] * xdiv;
		frmPtrs[idx]->Height = yhei[idx] * ydiv;
	}

	// 3. show (Form1 is already shown)
	Form2->Show();
	Form3->Show();
	Form4->Show();
}
//---------------------------------------------------------------------------
```