src/motif/mdi/lib/XsOutline.C

   1 /*
   2    Copyright (C) 1996 Scott W. Sadler
   3    All rights reserved.
   4 */
   5
   6 /*
   7    XsOutline.C
   8
   9    History
  10       03-Mar-96 1.0; Scott W. Sadler (ssadler@cisco.com)
  11                      Created
  12 */
  13
  14 // Includes
  15
  16 #include <assert.h>
  17 #include <X11/StringDefs.h>
  18 #include "XsOutline.h"
  19
  20 // Constructor
  21
  22 XsOutline::XsOutline (Widget w)
  23 {
  24    assert (w != 0);
  25
  26 // Initialize
  27
  28    _w = w;
  29
  30 // Get window dimensions
  31
  32    unsigned int moreJunk;
  33    unsigned int uw, uh;
  34    Window   junk;
  35
  36    XGetGeometry (XtDisplay (_w), XtWindow (_w), &junk, &_x, &_y, &uw, &uh, &moreJunk, &moreJunk);
  37
  38    _width = uw;
  39    _height = uh;
  40
  41 // Get initial settings
  42
  43    _savedX = _x;
  44    _savedY = _y;
  45    _savedH = _savedW = 0;
  46
  47 // Create the graphics context
  48
  49    XGCValues   values;
  50    unsigned long valuemask;
  51
  52    Display *dpy = XtDisplay (_w);
  53
  54    valuemask = GCFunction | GCLineWidth | GCSubwindowMode;
  55    values.function = GXinvert;
  56    values.line_width = 0;
  57    values.subwindow_mode = IncludeInferiors;
  58
  59    _gc = XCreateGC (dpy, XtWindow (_w), valuemask, &values);
  60 }
  61
  62 // Destructor
  63
  64 XsOutline::~XsOutline ( )
  65 {
  66    XFreeGC (XtDisplay (_w), _gc);
  67 }
  68
  69 // go
  70
  71 Boolean XsOutline::go (Boolean drawInitial)
  72 {
  73    XtAppContext appContext = XtWidgetToApplicationContext (_w);
  74    XEvent event;
  75    int   done = 0;
  76
  77 // Grab the pointer
  78
  79    if (_grabPointer ( ) == False)
  80       return (False);
  81
  82 // Draw the initial box (if requested)
  83
  84    if (drawInitial)
  85       _drawOutline (False);
  86
  87 // Process the events locally
  88
  89    while (!done)
  90    {
  91       XtAppNextEvent (appContext, &event);
  92
  93       switch (event.type)
  94       {
  95          case ButtonRelease:
  96          {
  97
  98 // Clear the outline and break
  99
 100             _drawOutline (True);
 101             done = 1;
 102             break;
 103          }
 104          case MotionNotify:
 105          {
 106             XEvent next;
 107
 108 // Process only the last motion event
 109
 110             while (XPending (XtDisplay (_w)) > 0)
 111             {
 112                XPeekEvent (XtDisplay (_w), &next);
 113                if (next.type != MotionNotify)
 114                   break;
 115                XtAppNextEvent (appContext, &event);
 116             }
 117
 118 // Send this event
 119
 120             _motionHandler (&event);
 121
 122             break;
 123          }
 124          default:
 125          {
 126             XtDispatchEvent (&event);
 127             break;
 128          }
 129       }
 130    }
 131
 132 // Ungrab the pointer
 133
 134    _ungrabPointer ( );
 135
 136    return (True);
 137 }
 138
 139 // _drawOutline
 140
 141 void XsOutline::_drawOutline (Boolean clear)
 142 {
 143
 144 // Clear the current outline
 145
 146    if (_savedH || _savedW)
 147       _drawIt (_savedX, _savedY, _savedW, _savedH);
 148
 149 // Save current values
 150
 151    _savedX = _x; _savedY = _y;
 152    _savedW = _width; _savedH = _height;
 153
 154 // Draw the new outline (unless flagged to just clear)
 155
 156    if (!clear)
 157       _drawIt (_x, _y, _width, _height);
 158 }
 159
 160 // _getCursor
 161
 162 Cursor XsOutline::_getCursor ( ) const
 163 {
 164    return (None);
 165 }
 166
 167 // _grabPointer
 168
 169 Boolean XsOutline::_grabPointer ( )
 170 {
 171
 172 // Sync everything up before being grabby
 173
 174    XSync (XtDisplay (_w), False);
 175
 176 // Grab the pointer
 177
 178    if (XGrabPointer (XtDisplay (_w), XtWindow (_w), False, GrabEventMask,
 179       GrabModeAsync, GrabModeAsync, XtWindow (XtParent (_w)), _getCursor ( ),
 180       CurrentTime) != GrabSuccess)
 181    {
 182       XBell (XtDisplay (_w), 100);
 183       return (False);
 184    }
 185
 186    return (True);
 187 }
 188
 189 // _ungrabPointer
 190
 191 void XsOutline::_ungrabPointer ( )
 192 {
 193
 194 // Ungrab the pointer
 195
 196    XUngrabPointer (XtDisplay (_w), CurrentTime);
 197 }
 198
 199 // _drawIt
 200
 201 void XsOutline::_drawIt (int x, int y, int w, int h)
 202 {
 203    const int nsegs = 8;
 204    XSegment    segs[nsegs];
 205
 206 // Across the top
 207
 208    segs[0].x1 = x; segs[0].y1 = y;
 209    segs[0].x2 = x + w - 1; segs[0].y2 = y;
 210
 211    segs[1].x1 = x + BorderSize; segs[1].y1 = y + BorderSize;
 212    segs[1].x2 = x + w - BorderSize - 1; segs[1].y2 = y + BorderSize;
 213
 214 // Down the left
 215
 216    segs[2].x1 = x + w - 1; segs[2].y1 = y + 1;
 217    segs[2].x2 = x + w - 1; segs[2].y2 = y + h - 1;
 218
 219    segs[3].x1 = x + w - BorderSize - 1; segs[3].y1 = y + BorderSize + 1;
 220    segs[3].x2 = x + w - BorderSize - 1; segs[3].y2 = y + h - BorderSize - 1;
 221
 222 // Across the bottom
 223
 224    segs[4].x1 = x + 1; segs[4].y1 = y + h - 1;
 225    segs[4].x2 = x + w - 2; segs[4].y2 = y + h - 1;
 226
 227    segs[5].x1 = x + BorderSize + 1; segs[5].y1 = y + h - BorderSize - 1;
 228    segs[5].x2 = x + w - BorderSize - 2; segs[5].y2 = y + h - BorderSize - 1;
 229
 230 // Up the left
 231
 232    segs[6].x1 = x; segs[6].y1 = y + h - 1;
 233    segs[6].x2 = x; segs[6].y2 = y + 1;
 234
 235    segs[7].x1 = x + BorderSize; segs[7].y1 = y + h - BorderSize - 1;
 236    segs[7].x2 = x + BorderSize; segs[7].y2 = y + BorderSize + 1;
 237
 238 // Draw the segments
 239
 240    XDrawSegments (XtDisplay (_w), XtWindow (XtParent (_w)), _gc, segs, nsegs);
 241 }