【CSplitterWnd技巧一】改变分割窗口拖动条的大小
作者:周焱
大家都知道默认的CSplitterWnd的拖动条很宽,看起来占地方,也不美观。怎么改变它呢?
研究CSplitterWnd的构造函数发现,拖动条的宽度是可以设置的。下面是我写的一个简单的CMySplitter类。他的效果如下:
下面是CMySplitter的代码:
=========================================================
//MySplitter.h
#pragma once
#include "stdafx.h"
class CMySplitter : public CSplitterWnd
{
public:
CMySplitter();
DECLARE_DYNCREATE(CMySplitter)
public:
~CMySplitter();
protected:
DECLARE_MESSAGE_MAP()
};
=========================================================
//MySplitter.cpp
#include "MySplitter.h"
IMPLEMENT_DYNCREATE(CMySplitter, CSplitterWnd)
//在构造函数中改变分割条的宽度和属性!
CMySplitter::CMySplitter()
{
m_cxSplitter = 4; //must >=4 ,拖动时拖动条的宽度
m_cySplitter = 4;
m_cxBorderShare = 0; //按下鼠标时拖动条的偏移量
m_cyBorderShare = 0;
m_cxSplitterGap= 1; //splitter拖动条的宽度
m_cySplitterGap= 1;
}
CMySplitter::~CMySplitter()
{
}
BEGIN_MESSAGE_MAP(CMySplitter, CSplitterWnd)
END_MESSAGE_MAP()
=========================================================
使用时,在主窗口中包含头文件MySplitter.h,将CSplitterWnd改成CMySplitter就可以了。
【CSplitterWnd技巧二】使分割窗口不能改变大小
有时候,需要保持分割窗口中每个小窗口的尺寸或者比例,不允许用户拖动分割条。我考虑了有两种方法可以实现。效果如下,鼠标在分割条上,没有出现可以改变大小的箭头。
方法1:
================================================
//CMySplitter.h
#pragmaonce
#include"stdafx.h"
classCMySplitter:publicCSplitterWnd
{
DECLARE_DYNAMIC(CMySplitter)
public:
protected:
//{{AFX_MSG(CMySplitter)
afx_msg UINT OnNcHitTest(CPoint point);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
================================================
//CMySplitter.cpp
#include"Cmysplitter.h"
IMPLEMENT_DYNAMIC(CMySplitter,CSplitterWnd)
BEGIN_MESSAGE_MAP(CMySplitter,CSplitterWnd)
ON_WM_NCHITTEST()
END_MESSAGE_MAP()
UINTCMySplitter::OnNcHitTest(CPointpoint)
{
//返回HTNOWHERE...
return HTNOWHERE;
}
================================================
方法2:
================================================
//CMySplitter.h
#pragmaonce
#include"stdafx.h"
classCMySplitter:publicCSplitterWnd
{
DECLARE_DYNCREATE(CMySplitter)
protected:
afx_msg void OnLButtonDown(UINT nFlags,CPoint point);
afx_msg BOOL OnSetCursor(CWnd* pWnd,UINT nHitTest,UINT message);
afx_msg void OnMouseMove(UINT nFlags,CPoint point);
DECLARE_MESSAGE_MAP()
};
================================================
//CMySplitter.cpp
#include"CMySplitter.h"
IMPLEMENT_DYNCREATE(CMySplitter,CSplitterWnd)
BEGIN_MESSAGE_MAP(CMySplitter,CSplitterWnd)
ON_WM_LBUTTONDOWN()
ON_WM_SETCURSOR()
ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()
voidCMySplitter::OnLButtonDown(UINTnFlags,CPointpoint)
{
//直接返回
return;
}
BOOLCMySplitter::OnSetCursor(CWnd*pWnd,UINTnHitTest,UINTmessage)
{
//当光标进入分割窗口时,不允许改变样子
return FALSE;
}
voidCMySplitter::OnMouseMove(UINTnFlags,CPointpoint)
{
//跳过调用CSplitterWnd::OnMouseMove,因为他会引起光标的改变
CWnd::OnMouseMove(nFlags,point);
}
================================================
虽然上面两种方法,一个繁一个易,但是从不同的角度分析和解决了问题。其实,面对一个想法,可能有多种处理方案。如果我们认真思考,会发现有很多方法能够达到我们的要求。
【CSplitterWnd技巧三】能拖动的带背景颜色的分割条
想实现这个功能,曾经困扰了我一段时间,后来发现原来是犯了一些小错误。
功能:
1,带背景颜色
2,拖动拖动条,能拖动窗口
效果如下:
程序:
==================================================
//MySplitter.h
#pragma once
#include "stdafx.h"
class CMySplitter : public CSplitterWnd
{
public:
CMySplitter();
DECLARE_DYNCREATE(CMySplitter)
public:
~CMySplitter();
protected:
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnMouseMove(UINT,CPoint);
BOOL PreCreateWindow(CREATESTRUCT& cs);
protected:
HBRUSH m_hbr; //背景刷子
CString m_clsName; //窗口类名
DECLARE_MESSAGE_MAP()
};
==================================================
//MySplitter.cpp
#include "MySplitter.h"
IMPLEMENT_DYNCREATE(CMySplitter, CSplitterWnd)
CMySplitter::CMySplitter()
{
m_cxSplitter = 4; //must >=4 ,拖动splitter时拖动条的宽度
m_cySplitter = 4;
m_cxBorderShare = -4; //按下鼠标时splitter拖动条的偏移量
m_cyBorderShare = -4;
m_cxSplitterGap= 16;
m_cySplitterGap= 16; //splitter拖动条的宽度
m_hbr = ::CreateSolidBrush(RGB(98,98,98));
m_clsName = "";
}
CMySplitter::~CMySplitter()
{
}
BEGIN_MESSAGE_MAP(CMySplitter, CSplitterWnd)
ON_WM_LBUTTONDOWN()
ON_WM_MOUSEMOVE()
ON_WM_RBUTTONDOWN()
END_MESSAGE_MAP()
void CMySplitter::OnLButtonDown(UINT nFlags, CPoint point)
{
//拖动splitter拖动条,能够拖动窗口
::PostMessage(AfxGetMainWnd()->GetSafeHwnd(),WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(point.x,point.y));
CWnd::OnLButtonDown(nFlags,point);
}
void CMySplitter::OnMouseMove(UINT nFlags, CPoint point)
{
//跳过调用CSplitterWnd::OnMouseMove,因为他会引起光标的改变
CWnd::OnMouseMove(nFlags, point);
}
BOOL CMySplitter::PreCreateWindow(CREATESTRUCT& cs)
{
//窗口类名必须在类的域类有效,否则::CreateWindowEx得到的是无效的类名。
//将会导致创建文档失败的错误。
m_clsName = AfxRegisterWndClass(0, ::LoadCursor (NULL,
IDC_ARROW), ::CreateSolidBrush(RGB(255,95,17)));
cs.lpszClass = (const char* )m_clsName;
return CSplitterWnd::PreCreateWindow(cs);
}
==================================================
说明:
1,要实现用拖动条拖动窗口,不能简单的用技巧2介绍的OnNcHitTest返回HTCAPTION来解决。因为这样只能拖动分割窗口,不能拖动主窗口。这里用在左键按下的时候 ::PostMessage(AfxGetMainWnd()->GetSafeHwnd(),WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(point.x,point.y)),通过给主窗口发送带HTCAPTION的WM_NCLBUTTONDOWN消息来实现。
2,默认的分割窗口的类名是AfxMDIFrame42d,它和MDI程序中的主窗口差不多,没有背景刷。在这里注册了一个新的窗口类,并指定了背景刷。要注意的是,窗口类名不能在PreCreateWindow中申明,应该放在类的申明中,作为类的成员函数。
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