/*****************************************************************************
 *
 *  Graph.c - This module handles the graphing window.
 *
 *  Microsoft Confidential
 *  Copyright (c) 1992-1993 Microsoft Corporation
 *
 *
 ****************************************************************************/

/*
   File Contents:

      This file contains the code for creating and manipulating the graph
      window. This window is a child of hWndMain and represents one of the
      three "views" of the program. The other views are log and alert.

      The graph window is actually just a container window, whose surface
      is completely filled by its children: hWndGraphDisplay, ,
      hWndGraphLegend, and hWndGraphStatus. Therefore much of this file is
      merely calls to the appropriate functions for these children.

      The graph window is responsible for the graph structure itself, 
      however. Conceptually this should be instance data for the graph
      window. Right now, however, there is only one window and only one
      graph structure. Nevertheless, we go through the GraphData(hWnd)
      function to get a pointer to the graph structure for the graph window.
      
*/


//==========================================================================//
//                                  Includes                                //
//==========================================================================//


#include "perfmon.h"
#include "graph.h"
#include "grafdisp.h"
#include "legend.h"
#include "valuebar.h"
#include "utils.h"   // for WindowShow


//==========================================================================//
//                                  Constants                               //
//==========================================================================//


//=============================//
// Graph Class                 //
//=============================//


TCHAR   szGraphWindowClass[] = TEXT("PerfGraph") ;
#define dwGraphClassStyle           (CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS)
#define iGraphClassExtra            (0)
#define iGraphWindowExtra           (0)
#define dwGraphWindowStyle          (WS_CHILD)



//==========================================================================//
//                              Local Functions                             //
//==========================================================================//


void static OnCreate (HWND hWnd)
   {  // OnCreate
   hWndGraphDisplay = CreateGraphDisplayWindow (hWnd) ;
   hWndGraphLegend = CreateGraphLegendWindow (hWnd) ;
   hWndGraphStatus = CreateGraphStatusWindow (hWnd) ;
   }  // OnCreate


void static OnPaint (HWND hWnd)
   {
   HDC            hDC ;
   PAINTSTRUCT    ps ;

   hDC = BeginPaint (hWnd, &ps) ;
   EndPaint (hWnd, &ps) ;
   }


void static OnSize (HWND hWnd, int xWidth, int yHeight)
   {  // OnSize
   SizeGraphComponents (hWnd) ;
   }  // OnSize


//==========================================================================//
//                              Message Handlers                            //
//==========================================================================//



LRESULT APIENTRY GraphWndProc (HWND hWnd,
                               WORD wMsg,
                               DWORD wParam,
                               LONG lParam)
   {  // GraphWndProc
   BOOL           bCallDefProc ;
   LRESULT        lReturnValue ;


   bCallDefProc = FALSE ;
   lReturnValue = 0L ;

   switch (wMsg)
      {  // switch
      case WM_CREATE:
         OnCreate (hWnd) ;
         break ;

      case WM_LBUTTONDBLCLK:
         SendMessage (hWndMain, WM_LBUTTONDBLCLK, wParam, lParam) ;
         break ;

      case WM_PAINT:
         OnPaint (hWnd) ;
         break ;

      case WM_SIZE:
         OnSize (hWnd, LOWORD (lParam), HIWORD (lParam)) ;
         break ;

      default:
         bCallDefProc = TRUE ;
      }  // switch


   if (bCallDefProc)
      lReturnValue = DefWindowProc (hWnd, wMsg, wParam, lParam) ;

   return (lReturnValue);
   }  // GraphWndProc



BOOL GraphInitializeApplication (void)
/*
   Note:          There is no background brush set for the MainWindow
                  class so that the main window is never erased. The
                  client area of MainWindow is always covered by one
                  of the view windows. If we erase it, it would just
                  flicker needlessly.
*/      
   {  // GraphInitializeApplication
   BOOL           bSuccess ;
   WNDCLASS       wc ;

   //=============================//
   // Register GraphWindow class  //
   //=============================//


   wc.style         = dwGraphClassStyle ;
   wc.lpfnWndProc   = (WNDPROC) GraphWndProc ;
   wc.hInstance     = hInstance ;
   wc.cbClsExtra    = iGraphWindowExtra ;
   wc.cbWndExtra    = iGraphClassExtra ;
   wc.hIcon         = NULL ;
   wc.hCursor       = LoadCursor(NULL, IDC_ARROW) ;
   wc.hbrBackground = NULL ;                          // see note above
   wc.lpszMenuName  = NULL ;
   wc.lpszClassName = szGraphWindowClass ;

   bSuccess = RegisterClass (&wc) ;


   //=============================//
   // Register Child classes      //
   //=============================//

   if (bSuccess)
      bSuccess = GraphDisplayInitializeApplication () ;

   if (bSuccess)
      bSuccess = GraphLegendInitializeApplication () ;
   
   if (bSuccess)
      bSuccess = GraphStatusInitializeApplication () ;

   return (bSuccess) ;
   }  // GraphInitializeApplication


HWND CreateGraphWindow (HWND hWndParent)
/*
   Effect:        Create the graph window. This window is a child of 
                  hWndMain and is a container for the graph data,
                  graph label, graph legend, and graph status windows.

   Note:          We dont worry about the size here, as this window
                  will be resized whenever the main window is resized.

*/
   {
   return (CreateWindow (szGraphWindowClass,       // window class
                         NULL,                     // caption
                         dwGraphWindowStyle,       // style for window
                         0, 0,                     // initial position
                         0, 0,                     // initial size
                         hWndParent,               // parent
                         NULL,                     // menu
                         hInstance,               // program instance
                         NULL)) ;                  // user-supplied data                                              
   }


void SizeGraphComponents (HWND hWnd)
/*
   Effect:        Move and show the various components of the graph to
                  fill the size (xWidth x yHeight). Take into account
                  whether the user wants to show the legend or status
                  bars. Also take into account if we have room for these
                  items.

   Internals:     If the user doesn't want the status or legend windows,
                  they aren't shown. Also, if the user wanted the status
                  window but not the legend window, the status window is
                  not shown.

                  We may disregard the user's desire for the legend or
                  status bar if there is not room. In particular, a legend
                  window has a minimum width (LegendMinWidth ()) and a
                  minimum height (LegendMinHeight ()). These values are
                  fixed for a given session of perfmon. It also has a 
                  preferred height, which takes into consideration the 
                  size of the graph window and the number of items in
                  the legend. This value is returned by LegendHeight().
      
                  We don't show the legend if its minimum height would
                  take up more than half the graph height.

                  If we feel we don't have room for the legend, we don't
                  show the status window either.

   See Also:      LegendMinWidth, LegendMinHeight, LegendHeight, 
                  ValuebarHeight.

   Called By:     OnSize, any other function that may remove or add one
                  of the graph components.
*/
   {  // SizeGraphComponents
   RECT           rectClient ;
   BOOL           bShowLegend ;
   BOOL           bShowStatus ;
   int            yStatusHeight ;
   int            yLegendHeight ;
   int            xWidth ;
   int            yHeight ;

   GetClientRect (hWnd, &rectClient) ;
   xWidth = rectClient.right - rectClient.left ;
   yHeight = rectClient.bottom - rectClient.top ;

   // if the graph window has no size, neither will its children.
   if (!xWidth || !yHeight)
      return ;

   //=============================//
   // Show the Legend Window?     //
   //=============================//

   if (!pGraphs->gOptions.bLegendChecked)
      bShowLegend = FALSE ;
   else if (xWidth < LegendMinWidth (hWndGraphLegend))
      bShowLegend = FALSE ;
   else if (yHeight < 5 * LegendMinHeight (hWndGraphLegend))
      bShowLegend = FALSE ;
   else
      bShowLegend = TRUE ;

   //=============================//
   // Show the Status Window?     //
   //=============================//

   if (!pGraphs->gOptions.bStatusBarChecked)
      bShowStatus = FALSE ;
   else if (!bShowLegend)
      bShowStatus = FALSE ;
   else
      bShowStatus = TRUE ;


   yStatusHeight = bShowStatus ? 
                     ValuebarHeight (hWndGraphStatus) : 0 ;
   yLegendHeight = bShowLegend ? 
                     LegendHeight (hWndGraphLegend, yHeight) : 0 ;


   //=============================//
   // Update the status window    //
   //=============================//

   if (bShowStatus)
      MoveWindow (hWndGraphStatus, 
                  0, yHeight - yStatusHeight - yLegendHeight,
                  xWidth, yStatusHeight,
                  TRUE) ;
   WindowShow (hWndGraphStatus, bShowStatus) ;


   //=============================//
   // Update the legend window    //
   //=============================//

   if (bShowLegend)
      MoveWindow (hWndGraphLegend,
                  0, yHeight - yLegendHeight,
                  xWidth, yLegendHeight,
                  TRUE) ;
   WindowShow (hWndGraphLegend, bShowLegend) ;


   //=============================//
   // Update the display window   //
   //=============================//

   MoveWindow (hWndGraphDisplay,
               0, 0,
               xWidth, yHeight - yStatusHeight - yLegendHeight,
               TRUE) ;
   SizeGraphDisplayComponents (hWndGraphDisplay) ;
   WindowInvalidate (hWndGraphDisplay) ;
   WindowShow (hWndGraphDisplay, TRUE) ;
   }  // SizeGraphComponents