VC++中HTControl控件类之CHTRichEdit富文本编辑控件实例

本文所述CHTRichEdit控件类继承自CRichEditCtrl，为了避免CRichEditCtrl的界面风格与CRichEditCtr的滚动条不相协调，因此在CHTRichEdit控件中去掉了CRichEditCtrl的默认滚动条，替换成自己绘制的滚动条，这样就不会破坏整体外观了。替换的滚动条并不需要与默认的滚动条同样的宽度，不受操作系统主题的影响，可以支持任意的宽度，而且在不需要滚动条时它会自动消失，使软件布局不会受到影响。

具体实现代码如下：

#if !defined(__CHTRichEdit_H__)
#define __CHTRichEdit_H__
#include "CHTScrollButton.h"
#include "CHTVertScrollBar.h"
#include "CHTHorzScrollBar.h"
class AFX_CLASS_EXPORT CHTRichEdit : public CRichEditCtrl
{
 DECLARE_DYNAMIC(CHTRichEdit)
public:
 CHTRichEdit();
 virtual ~CHTRichEdit();
protected:
 DECLARE_MESSAGE_MAP()
public:

void CreateButton(int iWidth, int iHeight, HBITMAP hBitmapUpNormal, HBITMAP hBitmapUpHover, HBITMAP hBitmapUpDown,
 HBITMAP hBitmapDownNormal, HBITMAP hBitmapDownHover, HBITMAP hBitmapDownDown,
 HBITMAP hBitmapLeftNormal, HBITMAP hBitmapLeftHover, HBITMAP hBitmapLeftDown,
 HBITMAP hBitmapRightNormal, HBITMAP hBitmapRightHover, HBITMAP hBitmapRightDown);

void CreateScrollBar(int iWidth, HBITMAP hBmpVBg, HBITMAP hBmpVThumb, HBITMAP hBmpVHoverThumb, HBITMAP hBmpVPressThumb,
 HBITMAP hBmpHBg, HBITMAP hBmpHThumb, HBITMAP hBmpHHoverThumb, HBITMAP hBmpHPressThumb,
 int iBgTopLen = 0, int iBgBottomLen = 0, int iThumbTopLen = 0, int iThumbBottomLen = 0);
 //以下是重载的原接口,可以查阅MSDN
 virtual BOOL Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID);
 virtual BOOL CreateEx(DWORD dwExStyle, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID);
 void MoveWindow(int x, int y, int nWidth, int nHeight, BOOL bRepaint = TRUE);
 void MoveWindow(LPCRECT lpRect, BOOL bRepaint = TRUE);
 BOOL SetWindowPos(HWND hWndInsertAfter, int x, int y, int cx, int cy, UINT uFlags);
private:
 afx_msg void onNcCalcSize(BOOL bCalcValidRects, NCCALCSIZE_PARAMS* lpncsp);
 afx_msg void onPaint();
 afx_msg void onEnChange();
 afx_msg void onNcPaint();
 afx_msg BOOL onNcActivate(BOOL bActive);
 afx_msg BOOL onEraseBkgnd(CDC* pDC);
 afx_msg void onKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
 afx_msg void onKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags);
 afx_msg void onEnHscroll();
 afx_msg void onEnVscroll();
 afx_msg void onCaptureChanged(CWnd *pWnd);
 afx_msg void onActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);
 afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
 afx_msg void onVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
 afx_msg void onHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
 afx_msg BOOL onMouseWheel(UINT nFlags, short zDelta, CPoint pt);
 afx_msg void onTimer(UINT_PTR nIDEvent);
 afx_msg LRESULT onNcHitTest(CPoint point);
 afx_msg void onEnRequestresize(NMHDR *pNMHDR, LRESULT *pResult);
 afx_msg void onSize(UINT nType, int cx, int cy);
 void SetScrollState();
 void UpdateScrollBar();
public:
 CHTScrollButton m_HTButtonUp;
 CHTVertScrollBar m_HTVScrollBar;
 CHTScrollButton m_HTButtonDown;
 CHTScrollButton m_HTButtonLeft;
 CHTHorzScrollBar m_HTHScrollBar;
 CHTScrollButton m_HTButtonRight;
private:
 int m_iBtnHeight;
 int m_iBtnWidth;
 BOOL m_bVScrollBarFlag;
 BOOL m_bHScrollBarFlag;
 int m_iWidth;
 int m_iHeight;
 int m_iX;
 int m_iY;
 BOOL m_bScrollFlag;
 BOOL m_bMoveFlag;
 int m_iScrollBarWidth;
 int m_iScrollBarHeight;
 BOOL m_bFlag;
 int m_iCountV;
 int m_iCountH;
};
#endif //!__CHTRichEdit_H__

代码备有一定的注释，希望本例所述能够对大家有所帮助。