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
XsOutline(Widget w)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
~XsOutline()64 XsOutline::~XsOutline ( )
65 {
66 XFreeGC (XtDisplay (_w), _gc);
67 }
68
69 // go
70
go(Boolean drawInitial)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
_drawOutline(Boolean clear)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
_getCursor()162 Cursor XsOutline::_getCursor ( ) const
163 {
164 return (None);
165 }
166
167 // _grabPointer
168
_grabPointer()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
_ungrabPointer()191 void XsOutline::_ungrabPointer ( )
192 {
193
194 // Ungrab the pointer
195
196 XUngrabPointer (XtDisplay (_w), CurrentTime);
197 }
198
199 // _drawIt
200
_drawIt(int x,int y,int w,int h)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 }
242