Fix from watz@gmx.net for Bugzilla Entry 862: When you resize the taskmanager window, the history graph is not updated anymore. When the window is resized back to default (smallest possible width) it
draws again.

Modified: trunk/reactos/subsys/system/taskmgr/graphctl.c
Modified: trunk/reactos/subsys/system/taskmgr/graphctl.h

--- trunk/reactos/subsys/system/taskmgr/graphctl.c	2005-10-09 13:05:49 UTC (rev 18375)
+++ trunk/reactos/subsys/system/taskmgr/graphctl.c	2005-10-09 15:04:18 UTC (rev 18376)
@@ -121,7 +121,7 @@

     this->m_hWnd = hWnd;
     GraphCtrl_Resize(this);
     if (result != 0)

-        GraphCtrl_InvalidateCtrl(this);

+        GraphCtrl_InvalidateCtrl(this, FALSE);

     return result;
 }
 
@@ -134,7 +134,7 @@

     this->m_dRange          = this->m_dUpperLimit - this->m_dLowerLimit;
     this->m_dVerticalFactor = (double)this->m_nPlotHeight / this->m_dRange;
     /*  clear out the existing garbage, re-start with a clean plot */

-    GraphCtrl_InvalidateCtrl(this);

+    GraphCtrl_InvalidateCtrl(this, FALSE);

 }
 
 #if 0
@@ -157,7 +157,7 @@

 {
     this->m_crGridColor = color;
     /*  clear out the existing garbage, re-start with a clean plot */

-    GraphCtrl_InvalidateCtrl(this);

+    GraphCtrl_InvalidateCtrl(this, FALSE);

 }
 
 void GraphCtrl_SetPlotColor(TGraphCtrl* this, int plot, COLORREF color)
@@ -166,7 +166,7 @@

     DeleteObject(this->m_penPlot[plot]);
     this->m_penPlot[plot] = CreatePen(PS_SOLID, 0, this->m_crPlotColor[plot]);
     /*  clear out the existing garbage, re-start with a clean plot */

-    GraphCtrl_InvalidateCtrl(this);

+    GraphCtrl_InvalidateCtrl(this, FALSE);

 }
 
 void GraphCtrl_SetBackgroundColor(TGraphCtrl* this, COLORREF color)
@@ -175,10 +175,10 @@

     DeleteObject(this->m_brushBack);
     this->m_brushBack = CreateSolidBrush(this->m_crBackColor);
     /*  clear out the existing garbage, re-start with a clean plot */

-    GraphCtrl_InvalidateCtrl(this);

+    GraphCtrl_InvalidateCtrl(this, FALSE);

 }
 

-void GraphCtrl_InvalidateCtrl(TGraphCtrl* this)

+void GraphCtrl_InvalidateCtrl(TGraphCtrl* this, BOOL bResize)

 {
     /*  There is a lot of drawing going on here - particularly in terms of  */
     /*  drawing the grid.  Don't panic, this is all being drawn (only once) */
@@ -203,6 +203,17 @@

         this->m_bitmapGrid = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
         this->m_bitmapOldGrid = (HBITMAP)SelectObject(this->m_dcGrid, this->m_bitmapGrid);
     }

+    else if(bResize)
+    {
+        // the size of the drawing area has changed
+        // so create a new bitmap of the appropriate size
+        if(this->m_bitmapGrid != NULL)
+        {
+            DeleteObject(this->m_bitmapGrid);
+            this->m_bitmapGrid = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
+            SelectObject(this->m_dcGrid, this->m_bitmapGrid);
+        }
+    }

 
     SetBkColor(this->m_dcGrid, this->m_crBackColor);
 
@@ -324,6 +335,17 @@

         this->m_bitmapPlot = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
         this->m_bitmapOldPlot = (HBITMAP)SelectObject(this->m_dcPlot, this->m_bitmapPlot);
     }

+    else if(bResize)
+    {
+        // the size of the drawing area has changed
+        // so create a new bitmap of the appropriate size
+        if(this->m_bitmapPlot != NULL)
+        {
+            DeleteObject(this->m_bitmapPlot);
+            this->m_bitmapPlot = CreateCompatibleBitmap(dc, this->m_nClientWidth, this->m_nClientHeight);
+            SelectObject(this->m_dcPlot, this->m_bitmapPlot);
+        }
+    }

 
     /*  make sure the plot bitmap is cleared */
     SetBkColor(this->m_dcPlot, this->m_crBackColor);
@@ -591,12 +613,12 @@

         if (hWnd == hPerformancePageMemUsageHistoryGraph)
         {
             GraphCtrl_Resize(&PerformancePageMemUsageHistoryGraph);

-            GraphCtrl_InvalidateCtrl(&PerformancePageMemUsageHistoryGraph);

+            GraphCtrl_InvalidateCtrl(&PerformancePageMemUsageHistoryGraph, TRUE);

         }
         if (hWnd == hPerformancePageCpuUsageHistoryGraph)
         {
             GraphCtrl_Resize(&PerformancePageCpuUsageHistoryGraph);

-            GraphCtrl_InvalidateCtrl(&PerformancePageCpuUsageHistoryGraph);

+            GraphCtrl_InvalidateCtrl(&PerformancePageCpuUsageHistoryGraph, TRUE);

         }
         return 0;
 

--- trunk/reactos/subsys/system/taskmgr/graphctl.h	2005-10-09 13:05:49 UTC (rev 18375)
+++ trunk/reactos/subsys/system/taskmgr/graphctl.h	2005-10-09 15:04:18 UTC (rev 18376)
@@ -93,7 +93,7 @@

 UINT nID);
 void    GraphCtrl_Dispose(TGraphCtrl* this);
 void    GraphCtrl_DrawPoint(TGraphCtrl* this);

-void    GraphCtrl_InvalidateCtrl(TGraphCtrl* this);

+void    GraphCtrl_InvalidateCtrl(TGraphCtrl* this, BOOL bResize);

 void    GraphCtrl_Paint(TGraphCtrl* this, HWND hWnd, HDC dc);
 void    GraphCtrl_Reset(TGraphCtrl* this);
 void    GraphCtrl_Resize(TGraphCtrl* this);