RmMFCPopupSlider.h

//=================================================================================================//
// filename:  RmMFCPopupSlider.h                                                                   //
//                                                                                                 //
//           ATI Research, Inc.                                                                    //
//           3D Application Research Group                                                         //
//                                                                                                 //
// Description: declaration file for a popup slider which can be attached to a numeric edit        //
//              control and modifies the value displayed in the control                            //
//=================================================================================================//
//   (C) 2004 ATI Research, Inc.  All rights reserved.                                             //
//=================================================================================================//

#ifndef _RM_MFC_UTILITIES_POPUP_SLIDER_H_
#define _RM_MFC_UTILITIES_POPUP_SLIDER_H_

#include <MFCUtilities/RmMFCTypes.h>

// Message definition for slider events
#define MSG_SLIDER_UPDATE        WM_USER + 1201           // When the slider's position has changed
#define MSG_SLIDER_CLOSED        WM_USER + 1202           // When the slider's been closed
#define MSG_SLIDER_RANGE_CHANGED WM_USER + 1203           // When the slider range was modifying

class RMMFCUTIL_API CPopupSlider: public CWnd
{
   
public:

   // Create a slider that will be placed at a given point p, has an initial value of fValue,
   // and operates in the range of [ fMin, fMax ]. pParentWnd is the window that will 
   // receive the messages (CSP_DELTAPOS & CPS_CLOSEUP) when the slider value changes and
   // when the slider closes. 
   CPopupSlider( CPoint p, float fValue, float fMin, float fMax, bool bClamp, CWnd* pParentWnd, bool bDynamicRange = true  );

   BOOL Create( CPoint p, CWnd* pParentWnd );
   
   // Kill this slider:
   void EndPopupSlider( int nMessage = MSG_SLIDER_CLOSED );

   // Retrieves the value from the slider:
   float GetSliderValue()
   {
      return m_fValue;
   }

   // Retrieves the range from the slider:
   void GetSliderRange( float* pfMin, float* pfMax )
   {
      (*pfMin) = m_fMin;
      (*pfMax) = m_fMax;
   }

   
protected:

   // Computes the slider indicator position based on the slider value:
   void ComputeSliderPosition();


   // Draw the slider and its indicator in the window:
   void DrawSlider();

   // Update slider position and repaint the window:
   void UpdateSliderWindow();

   // This method processes mouse move events when the right mouse button is in the UP state. In that  
   // case the mouse moving changes the value this popup slider is modifying:                         
   void UpdateSliderValue( CPoint mousePt );
  
   // This method processes mouse move events when the right mouse button is pressed DOWN and this     
   // popup slider doesn't have the range clamped down. In that case this method will shrink or expand 
   // the range based on the mouse moving up or down relative to the slider position on the screen:    
   void UpdateSliderRange( CPoint mousePt );

   
   
protected://.................MFC Generated message map functions
   
   afx_msg BOOL OnEraseBackground( CDC* pDC );
   afx_msg void OnNcDestroy();
   afx_msg void OnPaint();
   afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
   afx_msg void OnRButtonDown(UINT nFlags, CPoint point);
   afx_msg void OnRButtonUp(UINT nFlags, CPoint point);
   afx_msg void OnMouseMove(UINT nFlags, CPoint point);
   afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
   afx_msg void OnKillFocus(CWnd* pNewWnd);
   afx_msg BOOL OnMouseWheel( UINT nFlags, short zDelta, CPoint pt );
   afx_msg void OnCaptureChanged(CWnd *pWnd);
   
   // This is defined here to suppord MFC for Visual Studio 7.0 and 6.0:
#if _MFC_VER < 0x0700
   afx_msg void OnActivateApp(BOOL bActive, HTASK hTask);
#else
   afx_msg void OnActivateApp(BOOL bActive, DWORD hTask);
#endif
   
   
   DECLARE_MESSAGE_MAP()

private:
   CPopupSlider() {};         // Shouldn't create a slider w/ the default constructor
      
private://....................Member variables
   
   CWnd* m_pParent;           // The parent window
   
   bool m_bClosingSlider;     // Closing slider flag
   
   float m_fSliderPosition;   // The position of the slider indicator
   
   float m_fValue;            // The value that this slider was modifying

   float m_fMin;              // The range for the variable this slider is modifying
   float m_fMax;
   bool  m_bClamp;

   HCURSOR m_mouseCursor;     
   
   bool  m_bDynamicRange;     // Is the range allowed to be modified on the fly, or should it be static
   bool  m_bRButtonDown;      // Was the right mouse button pressed down?

   float m_fStepSize;         // The step size for modifying the range of the popup slider when allowed

   int m_nOldPosition;        // Stores the previous position of the mouse cursor
   CPoint m_oldPoint;         // Stores the previous position of the mouse cursor

   
};

#endif 

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