[ATL/WTL]_[初级]_[窗口如何实现WM_MOUSELEAVE和WM_MOUSEHOVER]

场景:

1. WTL的控件默认不支持进入和移出的 WM_MOUSEHOVER ,WM_MOUSELEAVE 事件, 即使写了映射也没用, 必须要使用函数

_TrackMouseEvent 添加监听.

https://msdn.microsoft.com/en-us/library/windows/desktop/ms645615(v=vs.85).aspx

2. 默认的Window窗口如果有子窗口时, 当进入子窗口时, 会对父窗口调用WM_MOUSELEAVE, 因为子窗口默认会拦截消息, 因为子窗口也得处理自己的MOUSEMOVE事件.

如果想全权处理子窗口的消息, 那么需要自己处理所有鼠标事件,这里没找到方法. 如果想自己处理子窗口的进入移除事件, 可以在父窗口绘制子窗口的按钮.

my_button.h

#ifndef __MY_BUTTON_H
#define __MY_BUTTON_H

#include <Windows.h>
#include <string>
#include "atlframe.h"

class MyButton : public CWindowImpl<MyButton>
{
public:
MyButton(){}
~MyButton(){}

BEGIN_MSG_MAP_EX(MyButton)
MESSAGE_HANDLER(WM_PAINT,OnPaint)
MESSAGE_HANDLER(WM_CREATE,OnCreate)
MESSAGE_HANDLER(WM_LBUTTONDOWN,OnLButtonDown)
MESSAGE_HANDLER(WM_MOUSEMOVE,OnMouseMove)
MESSAGE_HANDLER(WM_MOUSEHOVER,OnMouseHover)
MESSAGE_HANDLER(WM_MOUSELEAVE,OnMouseLeave)
REFLECT_NOTIFICATIONS()
END_MSG_MAP()

protected:

LRESULT OnEraseBkgnd(UINT uMsg,WPARAM wparam,LPARAM lparam,BOOL& bHandled);

LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

LRESULT OnPaint(UINT uMsg,WPARAM nnwparam,LPARAM lparam,BOOL& bHandled);

LRESULT OnCreate(UINT uMsg,WPARAM nnwparam,LPARAM lparam,BOOL& bHandled);

LRESULT OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

LRESULT OnMouseHover(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

LRESULT OnMouseLeave(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

private:
CToolTipCtrl tooltip_;
CButton button_;
bool m_bTracking_;

HBRUSH bg_color_brush_;
HBRUSH bg_white_brush_;
HBRUSH bg_brush_;
CRect button_rect_;

};

#endif

my_button.cpp

#include "stdafx.h"

#include "my_button.h"

LRESULT MyButton::OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
POINT pt = { LOWORD(lParam), HIWORD(lParam) };
if (PtInRect(&button_rect_, pt))
{
}
return 0;
}

LRESULT MyButton::OnMouseHover(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
bg_brush_ = bg_color_brush_;
Invalidate(0);
return 0;
}

LRESULT MyButton::OnMouseLeave(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
bg_brush_ = bg_white_brush_;
Invalidate(0);
m_bTracking_ = false;
return 0;
}

LRESULT MyButton::OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
MSG msg;
msg.message = WM_MOUSEMOVE;
msg.hwnd = m_hWnd;
msg.lParam = lParam;
msg.wParam = wParam;
tooltip_.RelayEvent(&msg);

if (!m_bTracking_)
{
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(TRACKMOUSEEVENT);
tme.dwFlags = TME_LEAVE | TME_HOVER;//要触发的消息类型
tme.hwndTrack = m_hWnd;
tme.dwHoverTime = 10;// 如果不设此参数,无法触发mouseHover

if (::_TrackMouseEvent(&tme)) //MOUSELEAVE|MOUSEHOVER消息由此函数触发.
{
m_bTracking_ = true;
}
}
return 0;
}

LRESULT MyButton::OnCreate(UINT uMsg,WPARAM nnwparam,LPARAM lparam,BOOL& bHandled)
{
m_bTracking_ = false;
bg_white_brush_ = AtlGetStockBrush(BLACK_BRUSH);
bg_color_brush_ = AtlGetStockBrush(GRAY_BRUSH);

tooltip_.Create(m_hWnd,NULL,NULL,TTS_NOPREFIX);
tooltip_.AddTool(m_hWnd,L"tooltip");

bg_brush_ = bg_white_brush_;

button_.Create(m_hWnd,CRect(20,20,120,40),L"Open",WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON);

return 0;
}

LRESULT MyButton::OnEraseBkgnd(UINT uMsg,WPARAM wparam,LPARAM lparam,BOOL& bHandled)
{
return (LRESULT)1;
}

LRESULT MyButton::OnPaint(UINT uMsg,WPARAM nnwparam,LPARAM lparam,BOOL& bHandled)
{
CPaintDC hdc(m_hWnd);

CRect client_rect;
GetClientRect(&client_rect);

CMemoryDC mdc(hdc,client_rect);
mdc.SetBkMode(TRANSPARENT);
Gdiplus::Graphics graphics(mdc);

mdc.FillRect(client_rect,bg_brush_);
return 0;
}

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完整项目下载地址:

http://download.csdn.net/detail/infoworld/9252273