Windows-classic-samples/Samples/Win7Samples/multimedia/mediafoundation/topoedit/app/dock.cpp

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved

#include "stdafx.h"

#include "dock.h"

#include <assert.h>

CDock::CArea::CArea(AREA_MOVE_TYPE Type)
{
    ZeroMemory(this, sizeof(CArea));
    m_MoveType = Type;
}

CDock::CDock()
    : m_StockLeft(MOVE_NO)
    , m_StockRight(MOVE_NO)
    , m_StockTop(MOVE_NO)
    , m_StockBottom(MOVE_NO)
{
}

CDock::~CDock()
{
    RemoveAllAreas();
}

DWORD CDock::GetAreaCount()
{
    return (DWORD) m_Areas.GetCount();
}

CDock::CArea* CDock::GetArea(DWORD n)
{
    if(n >= m_Areas.GetCount())
    {
        return NULL;
    }

    return m_Areas.GetAt(n);
}

CDock::CArea* CDock::AddArea(AREA_MOVE_TYPE Type)
{
    CArea* pArea;
    pArea = new CArea(Type);

    if(NULL != pArea)
    {
        m_Areas.Add(pArea);
    }

    return pArea;
}

CDock::CArea* CDock::GetStockArea(STOCK_AREA AreaType)
{
    switch(AreaType)
    {
        case STOCK_AREA_LEFT: return &m_StockLeft;
        case STOCK_AREA_RIGHT: return &m_StockRight;
        case STOCK_AREA_TOP: return &m_StockTop;
        case STOCK_AREA_BOTTOM: return &m_StockBottom;
    }

    return NULL;
}

void CDock::RemoveAllAreas()
{
    DWORD n;
    CArea* pArea;
    
    for(n = 0; n < m_Areas.GetCount(); n++)
    {
        pArea = m_Areas.GetAt(n);
        delete pArea;
    }

    m_Areas.RemoveAll();
}

void CDock::UpdateDock()
{
    RECT rect;

    GetClientRect(&rect);
    ResizeDock(rect.right - rect.top, rect.bottom - rect.top);
}

void CDock::MoveSplitter(CWindow* pSplitter, LONG x, LONG y)
{
    // Find the splitter area and move it to the new position
    for(size_t i = 0; i < m_Areas.GetCount(); i++) 
    {
        CArea* pArea = m_Areas.GetAt(i);
        if(pArea->m_pWindow == pSplitter) 
        {
            if(pArea->m_MoveType == MOVE_HOR) 
            {
                LONG newY = pArea->m_rc.top + y;
                pArea->m_posFixed.top = double(newY) / m_nHeight;
            }
            else 
            {
                LONG newX = pArea->m_rc.left + x;
                pArea->m_posFixed.left = double(newX) / m_nWidth;
            }
        }
    }

    UpdateDock();
}

void CDock::ResizeDock(long nWidth, long nHeight)
{
    DWORD n;
    CArea * pArea;
    DWORD nCurIter;

    m_nHeight = nHeight;
    m_nWidth = nWidth;
    
    // cleanup resize iteration    
    // update fixed position
    for(n = 0; n < m_Areas.GetCount(); n++)
    {
        pArea = m_Areas.GetAt(n);
        pArea->m_nResizeIter = 1;

        if(pArea->m_posFixed.left != 0.0)
        {
            pArea->m_rc.left = LONG(m_nWidth * pArea->m_posFixed.left);
            pArea->m_rc.right = LONG(pArea->m_rc.left + pArea->m_posFixed.width);
        }
        if(pArea->m_posFixed.top != 0.0)
        {
            pArea->m_rc.top = LONG(m_nHeight * pArea->m_posFixed.top);
            pArea->m_rc.bottom = LONG(pArea->m_rc.top + pArea->m_posFixed.height);
        }
    }

    
    // resize stock panes
    m_StockLeft.m_rc.bottom = nHeight;

    m_StockRight.m_rc.left = m_StockRight.m_rc.right = nWidth;
    m_StockRight.m_rc.bottom = nHeight;
    
    m_StockTop.m_rc.right = nWidth;
    
    m_StockBottom.m_rc.right = nWidth;
    m_StockBottom.m_rc.bottom = m_StockBottom.m_rc.top = nHeight;

    // run through all panes and resize
    for(nCurIter = 0; nCurIter < 100; nCurIter++)
    {
        for(n = 0; n < m_Areas.GetCount(); n++)
        {
            pArea = m_Areas.GetAt(n);
            
            if(pArea->m_nResizeIter >= nCurIter)
            {
                // we can resize if we already resized all attached
                if(CanResize(pArea))
                {
                    ResizePane(pArea);
                }
                else
                {
                    pArea->m_nResizeIter = nCurIter+1;
                }
                
            }
        }
    }

    // update position for all windows
    for(n = 0; n < m_Areas.GetCount(); n++)
    {
        pArea = m_Areas.GetAt(n);
        if(pArea->m_pWindow)
        {
            pArea->m_pWindow->SetWindowPos(HWND_BOTTOM, &(pArea->m_rc), SWP_NOZORDER);
        }
    }
}

void CDock::ResizePane(CDock::CArea* pArea)
{
    if(pArea->m_Attach.pLeft)
    {
        pArea->m_rc.left = pArea->m_Attach.pLeft->m_rc.right;
    }

    if(pArea->m_Attach.pRight)
    {
        pArea->m_rc.right = pArea->m_Attach.pRight->m_rc.left;
    }
    
    if(pArea->m_Attach.pTop)
    {
        pArea->m_rc.top = pArea->m_Attach.pTop->m_rc.bottom;
    }

    if(pArea->m_Attach.pBottom)
    {
        pArea->m_rc.bottom = pArea->m_Attach.pBottom->m_rc.top;
    }
}

BOOL CDock::CanResize(CDock::CArea* pArea)
{
    if(pArea->m_Attach.pLeft && pArea->m_Attach.pLeft->m_nResizeIter >= pArea->m_nResizeIter)
    {
        return FALSE;
    }
    if(pArea->m_Attach.pRight && pArea->m_Attach.pRight->m_nResizeIter >= pArea->m_nResizeIter)
    {
        return FALSE;
    }
    if(pArea->m_Attach.pTop && pArea->m_Attach.pTop->m_nResizeIter >= pArea->m_nResizeIter)
    {
        return FALSE;
    }
    if(pArea->m_Attach.pBottom && pArea->m_Attach.pBottom->m_nResizeIter >= pArea->m_nResizeIter)
    {
        return FALSE;
    }

    return TRUE;
}

LRESULT CDock::OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    bHandled = TRUE;
    
    return 0;
}

LRESULT CDock::OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    ResizeDock(LOWORD(lParam), HIWORD(lParam)); 

    bHandled = TRUE;
    
    return 0;
}