REDM基础教程6-主窗口消息分发
REDM消息分发的流程是trunk过程（流程图位于Docs\DUI主流程图.vsdx）
trunk的核心思想是把窗口过程中的hWnd值换成了我们的this指针，比如MyTest的Main窗口就被trunk换成了我们的CMainWnd指针
而DMCWnd::WindowProc函数就接管了所有的消息分发（SetWindowLongPtr）
LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
前面提到了，hWnd被换成了this，所以在WindowProc中有如下代码：
DMCWnd* pThis = (DMCWnd*)hWnd; // 强转为对象指针 BOOL bRet = pThis->ProcessWindowMessage(pThis->m_hWnd, uMsg, wParam, lParam, lRes, 0);
分发的流程为：
所以要处理主窗口的消息分发，只需处理ProcessWindowMessage即可，ProcessWindowMessage在DM库内部使用了宏定义来声明
#define DECLARE_MESSAGE_MAP() \ public: \ BOOL IsMsgHandled() const; \ void SetMsgHandled(BOOL bHandled); \ BOOL ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult, DWORD dwMsgMapID = 0); \ BOOL _ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult, DWORD dwMsgMapID);
当然，你可以不使用宏，直接使用函数的方式来处理它的消息，本质是一样的
1.使用MacroTool小工具
宏是提供了易用性，但难于调试，因为VS在转换宏时，会把所有宏转换成一行！，所以提供了个小工具方便转换宏，打开Tools\MacroTool\已编译的bin\DMMacro.exe，把DMMsgCrack.h、DMXmlCrack.h、DUIMsgCrack.h、DMEventCrack.h拷贝到同目录下
把要转换的宏粘贴到小工具里，如我们的MainWnd.cpp中的
BEGIN_MSG_MAP(CMainWnd) MSG_WM_INITDIALOG(OnInitDialog) MSG_WM_SIZE(OnSize) CHAIN_MSG_MAP(DMHWnd)// 将未处理的消息交由DMHWnd处理 END_MSG_MAP()
点击Convert，即转换成功（注释去掉）
转换后的代码如下：
BOOL CMainWnd::IsMsgHandled() const
{
return m_bMsgHandled;
}
void CMainWnd::SetMsgHandled(BOOL bHandled)
{
m_bMsgHandled = bHandled;
}
BOOL CMainWnd:: ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult, DWORD dwMsgMapID/* = 0*/)
{
BOOL bOldMsgHandled = m_bMsgHandled;
BOOL bRet = _ProcessWindowMessage(hWnd, uMsg, wParam, lParam, lResult, dwMsgMapID);
m_bMsgHandled = bOldMsgHandled;
return bRet;
}
BOOL CMainWnd::_ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult, DWORD dwMsgMapID)
{
BOOL bHandled = TRUE;
hWnd;
uMsg;
wParam;
lParam;
lResult;
bHandled;
switch(dwMsgMapID)
{
case 0:
if (uMsg == WM_INITDIALOG)
{
SetMsgHandled(TRUE);
lResult = (LRESULT)OnInitDialog((HWND)wParam, lParam);
if(IsMsgHandled())
return TRUE;
}
if (uMsg == WM_SIZE)
{
SetMsgHandled(TRUE);
OnSize((UINT)wParam, _WTYPES_NS::CSize(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)));
lResult = 0;
if(IsMsgHandled())
return TRUE;
}
{
if(DMHWnd::ProcessWindowMessage(hWnd, uMsg, wParam, lParam, lResult,dwMsgMapID))
return TRUE;
}
break;
default:
DMASSERT_EXPR(0, L"msgMapID不对,消息未被处理");
break;
}
return FALSE;
}
从转换后的代码我们可以看出，主消息分发，实际对应的是if（uMsg == XX消息）这种模式
如果处理完成，就直接返回TRUE,
if(IsMsgHandled()) return TRUE;
未处理，继续向下走，最后交由父类处理
CHAIN_MSG_MAP(DMHWnd)// 将未处理的消息交由DMHWnd处理---> if(DMHWnd::ProcessWindowMessage(hWnd, uMsg, wParam, lParam, lResult,dwMsgMapID)) return TRUE;
所以如果我们想处理完某个消息后，又想让父类来接着处理
可以使用
SetMsgHandled(FALSE); // 由DMHWnd继续处理OnSize消息
如CMainWnd的OnSize消息处理：
void CMainWnd::OnSize(UINT nType, CSize size)
{
DUIWindow* pMaxBtn = FindChildByName(L"maxbutton");
DUIWindow* pRestoreBtn = FindChildByName(L"restorebutton");
if (0 != size.cx&&0 != size.cy&&pMaxBtn&&pRestoreBtn)
{
if (SIZE_MAXIMIZED == nType)
{
pMaxBtn->DM_SetVisible(false);
pRestoreBtn->DM_SetVisible(true);
}
else if (SIZE_RESTORED == nType)
{
pMaxBtn->DM_SetVisible(true);
pRestoreBtn->DM_SetVisible(false);
}
}
SetMsgHandled(FALSE); // 由DMHWnd继续处理OnSize消息
}
2.增加主窗口消息函数
经过前面的介绍，增加主窗口的消息函数是非常简单的
1.在头文件中声明
DECLARE_MESSAGE_MAP() // 仿MFC消息映射宏，也可以使用BEGIN_MSG_MAPT宏使消息处理在头文件
2.在cpp文件中定义,消息函数的定义可以在DMMsgCrack.h中找到，使用的就是atlcrack.h宏，不同的是，DM的一个主窗口只有一份m_bMsgHandled,而atlcrack.h中有多份
BEGIN_MSG_MAP(CMainWnd) .... CHAIN_MSG_MAP(DMHWnd)// 将未处理的消息交由DMHWnd处理 END_MSG_MAP()
3.有些消息需要自己处理完后交由父窗口处理，使用
SetMsgHandled(FALSE); // 由DMHWnd继续处理OnSize消息
下一节教程：REDM基础教程7-DUI子控件消息分发
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