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selbox.c
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1 #include <ctype.h>
2 #include <rfb/rfb.h>
3 #include <rfb/keysym.h>
4 
5 typedef struct {
6  rfbScreenInfoPtr screen;
7  rfbFontDataPtr font;
8  char** list;
9  int listSize;
10  int selected;
12  int x1,y1,x2,y2,textH,pageH;
13  int xhot,yhot;
14  int buttonWidth,okBX,cancelBX,okX,cancelX,okY;
15  rfbBool okInverted,cancelInverted;
17  rfbPixel colour,backColour;
19  enum { SELECTING, OK, CANCEL } state;
21 
22 static const char* okStr="OK";
23 static const char* cancelStr="Cancel";
24 
25 static void selPaintButtons(rfbSelectData* m,rfbBool invertOk,rfbBool invertCancel)
26 {
27  rfbScreenInfoPtr s = m->screen;
28  rfbPixel bcolour = m->backColour;
29  rfbPixel colour = m->colour;
30 
31  rfbFillRect(s,m->x1,m->okY-m->textH,m->x2,m->okY,bcolour);
32 
33  if(invertOk) {
34  rfbFillRect(s,m->okBX,m->okY-m->textH,m->okBX+m->buttonWidth,m->okY,colour);
35  rfbDrawStringWithClip(s,m->font,m->okX+m->xhot,m->okY-1+m->yhot,okStr,
36  m->x1,m->okY-m->textH,m->x2,m->okY,
37  bcolour,colour);
38  } else
39  rfbDrawString(s,m->font,m->okX+m->xhot,m->okY-1+m->yhot,okStr,colour);
40 
41  if(invertCancel) {
42  rfbFillRect(s,m->cancelBX,m->okY-m->textH,
43  m->cancelBX+m->buttonWidth,m->okY,colour);
44  rfbDrawStringWithClip(s,m->font,m->cancelX+m->xhot,m->okY-1+m->yhot,
45  cancelStr,m->x1,m->okY-m->textH,m->x2,m->okY,
46  bcolour,colour);
47  } else
48  rfbDrawString(s,m->font,m->cancelX+m->xhot,m->okY-1+m->yhot,cancelStr,colour);
49 
50  m->okInverted = invertOk;
51  m->cancelInverted = invertCancel;
52 }
53 
54 /* line is relative to displayStart */
55 static void selPaintLine(rfbSelectData* m,int line,rfbBool invert)
56 {
57  int y1 = m->y1+line*m->textH, y2 = y1+m->textH;
58  if(y2>m->y2)
59  y2=m->y2;
60  rfbFillRect(m->screen,m->x1,y1,m->x2,y2,invert?m->colour:m->backColour);
61  if(m->displayStart+line<m->listSize)
62  rfbDrawStringWithClip(m->screen,m->font,m->x1+m->xhot,y2-1+m->yhot,
63  m->list[m->displayStart+line],
64  m->x1,y1,m->x2,y2,
65  invert?m->backColour:m->colour,
66  invert?m->backColour:m->colour);
67 }
68 
69 static void selSelect(rfbSelectData* m,int _index)
70 {
71  int delta;
72 
73  if(_index==m->selected || _index<0 || _index>=m->listSize)
74  return;
75 
76  if(m->selected>=0)
77  selPaintLine(m,m->selected-m->displayStart,FALSE);
78 
79  if(_index<m->displayStart || _index>=m->displayStart+m->pageH) {
80  /* targetLine is the screen line in which the selected line will
81  be displayed.
82  targetLine = m->pageH/2 doesn't look so nice */
83  int targetLine = m->selected-m->displayStart;
84  int lineStart,lineEnd;
85 
86  /* scroll */
87  if(_index<targetLine)
88  targetLine = _index;
89  else if(_index+m->pageH-targetLine>=m->listSize)
90  targetLine = _index+m->pageH-m->listSize;
91  delta = _index-(m->displayStart+targetLine);
92 
93  if(delta>-m->pageH && delta<m->pageH) {
94  if(delta>0) {
95  lineStart = m->pageH-delta;
96  lineEnd = m->pageH;
97  rfbDoCopyRect(m->screen,m->x1,m->y1,m->x2,m->y1+lineStart*m->textH,
98  0,-delta*m->textH);
99  } else {
100  lineStart = 0;
101  lineEnd = -delta;
103  m->x1,m->y1+lineEnd*m->textH,m->x2,m->y2,
104  0,-delta*m->textH);
105  }
106  } else {
107  lineStart = 0;
108  lineEnd = m->pageH;
109  }
110  m->displayStart += delta;
111  for(delta=lineStart;delta<lineEnd;delta++)
112  if(delta!=_index)
113  selPaintLine(m,delta,FALSE);
114  }
115 
116  m->selected = _index;
117  selPaintLine(m,m->selected-m->displayStart,TRUE);
118 
119  if(m->selChangedHook)
120  m->selChangedHook(_index);
121 
122  /* todo: scrollbars */
123 }
124 
125 static void selKbdAddEvent(rfbBool down,rfbKeySym keySym,rfbClientPtr cl)
126 {
127  if(down) {
128  if(keySym>' ' && keySym<0xff) {
129  int i;
130  rfbSelectData* m = (rfbSelectData*)cl->screen->screenData;
131  char c = tolower(keySym);
132 
133  for(i=m->selected+1;m->list[i] && tolower(m->list[i][0])!=c;i++);
134  if(!m->list[i])
135  for(i=0;i<m->selected && tolower(m->list[i][0])!=c;i++);
136  selSelect(m,i);
137  } else if(keySym==XK_Escape) {
138  rfbSelectData* m = (rfbSelectData*)cl->screen->screenData;
139  m->state = CANCEL;
140  } else if(keySym==XK_Return) {
141  rfbSelectData* m = (rfbSelectData*)cl->screen->screenData;
142  m->state = OK;
143  } else {
144  rfbSelectData* m = (rfbSelectData*)cl->screen->screenData;
145  int curSel=m->selected;
146  if(keySym==XK_Up) {
147  if(curSel>0)
148  selSelect(m,curSel-1);
149  } else if(keySym==XK_Down) {
150  if(curSel+1<m->listSize)
151  selSelect(m,curSel+1);
152  } else {
153  if(keySym==XK_Page_Down) {
154  if(curSel+m->pageH<m->listSize)
155  selSelect(m,curSel+m->pageH);
156  else
157  selSelect(m,m->listSize-1);
158  } else if(keySym==XK_Page_Up) {
159  if(curSel-m->pageH>=0)
160  selSelect(m,curSel-m->pageH);
161  else
162  selSelect(m,0);
163  }
164  }
165  }
166  }
167 }
168 
169 static void selPtrAddEvent(int buttonMask,int x,int y,rfbClientPtr cl)
170 {
171  rfbSelectData* m = (rfbSelectData*)cl->screen->screenData;
172  if(y<m->okY && y>=m->okY-m->textH) {
173  if(x>=m->okBX && x<m->okBX+m->buttonWidth) {
174  if(!m->okInverted)
175  selPaintButtons(m,TRUE,FALSE);
176  if(buttonMask)
177  m->state = OK;
178  } else if(x>=m->cancelBX && x<m->cancelBX+m->buttonWidth) {
179  if(!m->cancelInverted)
180  selPaintButtons(m,FALSE,TRUE);
181  if(buttonMask)
182  m->state = CANCEL;
183  } else if(m->okInverted || m->cancelInverted)
184  selPaintButtons(m,FALSE,FALSE);
185  } else {
186  if(m->okInverted || m->cancelInverted)
187  selPaintButtons(m,FALSE,FALSE);
188  if(!m->lastButtons && buttonMask) {
189  if(x>=m->x1 && x<m->x2 && y>=m->y1 && y<m->y2)
190  selSelect(m,m->displayStart+(y-m->y1)/m->textH);
191  }
192  }
193  m->lastButtons = buttonMask;
194 
195  /* todo: scrollbars */
196 }
197 
198 static rfbCursorPtr selGetCursorPtr(rfbClientPtr cl)
199 {
200  return NULL;
201 }
202 
203 int rfbSelectBox(rfbScreenInfoPtr rfbScreen,rfbFontDataPtr font,
204  char** list,
205  int x1,int y1,int x2,int y2,
206  rfbPixel colour,rfbPixel backColour,
207  int border,SelectionChangedHookPtr selChangedHook)
208 {
209  int bpp = rfbScreen->bitsPerPixel/8;
210  char* frameBufferBackup;
211  void* screenDataBackup = rfbScreen->screenData;
212  rfbKbdAddEventProcPtr kbdAddEventBackup = rfbScreen->kbdAddEvent;
213  rfbPtrAddEventProcPtr ptrAddEventBackup = rfbScreen->ptrAddEvent;
214  rfbGetCursorProcPtr getCursorPtrBackup = rfbScreen->getCursorPtr;
215  rfbDisplayHookPtr displayHookBackup = rfbScreen->displayHook;
216  rfbSelectData selData;
217  int i,j,k;
218  int fx1,fy1,fx2,fy2; /* for font bbox */
219 
220  if(list==0 || *list==0)
221  return(-1);
222 
223  rfbWholeFontBBox(font, &fx1, &fy1, &fx2, &fy2);
224  selData.textH = fy2-fy1;
225  /* I need at least one line for the choice and one for the buttons */
226  if(y2-y1<selData.textH*2+3*border)
227  return(-1);
228  selData.xhot = -fx1;
229  selData.yhot = -fy2;
230  selData.x1 = x1+border;
231  selData.y1 = y1+border;
232  selData.y2 = y2-selData.textH-3*border;
233  selData.x2 = x2-2*border;
234  selData.pageH = (selData.y2-selData.y1)/selData.textH;
235 
236  i = rfbWidthOfString(font,okStr);
237  j = rfbWidthOfString(font,cancelStr);
238  selData.buttonWidth= k = 4*border+(i<j)?j:i;
239  selData.okBX = x1+(x2-x1-2*k)/3;
240  if(selData.okBX<x1+border) /* too narrow! */
241  return(-1);
242  selData.cancelBX = x1+k+(x2-x1-2*k)*2/3;
243  selData.okX = selData.okBX+(k-i)/2;
244  selData.cancelX = selData.cancelBX+(k-j)/2;
245  selData.okY = y2-border;
246 
247  frameBufferBackup = (char*)malloc(bpp*(x2-x1)*(y2-y1));
248 
249  selData.state = SELECTING;
250  selData.screen = rfbScreen;
251  selData.font = font;
252  selData.list = list;
253  selData.colour = colour;
254  selData.backColour = backColour;
255  for(i=0;list[i];i++);
256  selData.selected = i;
257  selData.listSize = i;
258  selData.displayStart = i;
259  selData.lastButtons = 0;
260  selData.selChangedHook = selChangedHook;
261 
262  rfbScreen->screenData = &selData;
263  rfbScreen->kbdAddEvent = selKbdAddEvent;
264  rfbScreen->ptrAddEvent = selPtrAddEvent;
265  rfbScreen->getCursorPtr = selGetCursorPtr;
266  rfbScreen->displayHook = NULL;
267 
268  /* backup screen */
269  for(j=0;j<y2-y1;j++)
270  memcpy(frameBufferBackup+j*(x2-x1)*bpp,
271  rfbScreen->frameBuffer+j*rfbScreen->paddedWidthInBytes+x1*bpp,
272  (x2-x1)*bpp);
273 
274  /* paint list and buttons */
275  rfbFillRect(rfbScreen,x1,y1,x2,y2,colour);
276  selPaintButtons(&selData,FALSE,FALSE);
277  selSelect(&selData,0);
278 
279  /* modal loop */
280  while(selData.state == SELECTING)
281  rfbProcessEvents(rfbScreen,20000);
282 
283  /* copy back screen data */
284  for(j=0;j<y2-y1;j++)
285  memcpy(rfbScreen->frameBuffer+j*rfbScreen->paddedWidthInBytes+x1*bpp,
286  frameBufferBackup+j*(x2-x1)*bpp,
287  (x2-x1)*bpp);
288  free(frameBufferBackup);
289  rfbMarkRectAsModified(rfbScreen,x1,y1,x2,y2);
290  rfbScreen->screenData = screenDataBackup;
291  rfbScreen->kbdAddEvent = kbdAddEventBackup;
292  rfbScreen->ptrAddEvent = ptrAddEventBackup;
293  rfbScreen->getCursorPtr = getCursorPtrBackup;
294  rfbScreen->displayHook = displayHookBackup;
295 
296  if(selData.state==CANCEL)
297  selData.selected=-1;
298  return(selData.selected);
299 }
300