//////////////////////////////////////////////////////////////////////////////
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// The following are Copyright © 2007, Casey Langen
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//////////////////////////////////////////////////////////////////////////////

#include <pch.h>
#include <win32cpp/GroupBox.hpp>
#include <win32cpp/Application.hpp>

//////////////////////////////////////////////////////////////////////////////

using namespace win32cpp;

//////////////////////////////////////////////////////////////////////////////

///\brief
///Default constructor.
/*ctor*/    GroupBox::GroupBox(const uichar* caption)
: base()
, caption(caption)
{
}

HWND        GroupBox::Create(Window* parent)
{
    HINSTANCE hInstance = Application::Instance();

    // create the window
    // (use WS_CLIPSIBLINGS to avoid unnecessary repainting of controls inside)
    DWORD style = WS_CHILD | WS_VISIBLE | BS_GROUPBOX | WS_CLIPSIBLINGS;
    //
    HWND hwnd = CreateWindowEx(
        NULL,                   // ExStyle
        _T("BUTTON"),           // Class name
        this->caption.c_str(),  // Window name
        style,                  // Style
        0,                      // X
        0,                      // Y
        100,                    // Width
        100,                    // Height
        parent->Handle(),       // Parent
        NULL,                   // Menu
        hInstance,              // Instance
        NULL);                  // lParam

    return hwnd;
}

void        GroupBox::OnChildAdded(Window* newChild)
{
    SIZE idealSize;

    idealSize.cx = 0;
    idealSize.cy = 0;

    // all child elements should be resized to their ideal size
    if(newChild->SendMessageW(BCM_GETIDEALSIZE, 0, (LPARAM)(SIZE*)&idealSize)) {
        newChild->Resize(idealSize.cx, idealSize.cy);
    }

    // all child elements should be WITHIN the groupbox frame,
    // so we need to try to position them perfectly
    RECT childRect = newChild->ClientRect();
    newChild->MoveTo(
        childRect.left + GetSystemMetrics(SM_CXDLGFRAME) + GetSystemMetrics(SM_CXBORDER),
        childRect.top  + GetSystemMetrics(SM_CYDLGFRAME) + GetSystemMetrics(SM_CYBORDER) + GetSystemMetrics(SM_CYCAPTION)
    );
}

void        GroupBox::OnEraseBackground(HDC hdc)
{
    HBRUSH bgbrush;
    RECT bgrect;

    // repaint background (since its white due to its parent controls)
    bgbrush = ::CreateSolidBrush(GetSysColor(COLOR_BTNFACE));
    ::SelectObject(hdc, bgbrush);
    
    ::GetClientRect(this->windowHandle, &bgrect);
    ::FillRect(hdc, &bgrect, bgbrush);

    ::DeleteObject(bgbrush);
}
