src/frontends/xforms/xscreen.C

   1 /**
   2  * \file xscreen.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author unknown
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS
  10  */
  11
  12 #include <config.h>
  13
  14 #ifdef __GNUG__
  15 #pragma implementation
  16 #endif
  17
  18 #include <algorithm>
  19 #include <X11/Xlib.h>
  20
  21 #include "frontends/screen.h"
  22 #include "frontends/font_metrics.h"
  23 #include "XWorkArea.h"
  24 #include "xscreen.h"
  25 #include "lyxtext.h"
  26 #include "lyxrow.h"
  27 #include "Painter.h"
  28 #include "WorkArea.h"
  29 #include "buffer.h"
  30 #include "BufferView.h"
  31 #include "insets/insettext.h"
  32 #include "ColorHandler.h"
  33 #include "language.h"
  34 #include "debug.h"
  35
  36 using std::endl;
  37 using std::max;
  38 using std::min;
  39
  40 namespace {
  41
  42 GC createGC()
  43 {
  44         XGCValues val;
  45         val.foreground = BlackPixel(fl_get_display(),
  46                                     DefaultScreen(fl_get_display()));
  47
  48         val.function = GXcopy;
  49         val.graphics_exposures = false;
  50         val.line_style = LineSolid;
  51         val.line_width = 0;
  52         return XCreateGC(fl_get_display(), RootWindow(fl_get_display(), 0),
  53                          GCForeground | GCFunction | GCGraphicsExposures
  54                          | GCLineWidth | GCLineStyle, &val);
  55 }
  56
  57 } // namespace anon
  58
  59
  60 // Constructor
  61 XScreen::XScreen(XWorkArea & o)
  62         : LyXScreen(), owner_(o)
  63 {
  64         // the cursor isnt yet visible
  65         cursor_pixmap = 0;
  66         cursor_pixmap_x = 0;
  67         cursor_pixmap_y = 0;
  68         cursor_pixmap_w = 0;
  69         cursor_pixmap_h = 0;
  70
  71         // We need this GC
  72         gc_copy = createGC();
  73 }
  74
  75
  76 XScreen::~XScreen()
  77 {
  78         XFreeGC(fl_get_display(), gc_copy);
  79 }
  80
  81
  82 void XScreen::setCursorColor()
  83 {
  84         if (!lyxColorHandler.get()) return;
  85
  86         GC gc = lyxColorHandler->getGCForeground(LColor::cursor);
  87
  88         XGCValues val;
  89         XGetGCValues(fl_get_display(),
  90                      gc, GCForeground, &val);
  91         XChangeGC(fl_get_display(), gc_copy, GCForeground, &val);
  92 }
  93
  94
  95 void XScreen::showManualCursor(LyXText const * text, int x, int y,
  96                                  int asc, int desc, Cursor_Shape shape)
  97 {
  98         // Update the cursor color.
  99         setCursorColor();
 100
 101         int const y1 = max(y - text->first_y - asc, 0);
 102         int const y_tmp = min(y - text->first_y + desc,
 103                               static_cast<int>(owner_.workHeight()));
 104
 105         // Secure against very strange situations
 106         int const y2 = max(y_tmp, y1);
 107
 108         if (cursor_pixmap) {
 109                 XFreePixmap(fl_get_display(), cursor_pixmap);
 110                 cursor_pixmap = 0;
 111         }
 112
 113         if (y2 > 0 && y1 < int(owner_.workHeight())) {
 114                 cursor_pixmap_h = y2 - y1 + 1;
 115                 cursor_pixmap_y = y1;
 116
 117                 switch (shape) {
 118                 case BAR_SHAPE:
 119                         cursor_pixmap_w = 1;
 120                         cursor_pixmap_x = x;
 121                         break;
 122                 case L_SHAPE:
 123                         cursor_pixmap_w = cursor_pixmap_h/3;
 124                         cursor_pixmap_x = x;
 125                         break;
 126                 case REVERSED_L_SHAPE:
 127                         cursor_pixmap_w = cursor_pixmap_h/3;
 128                         cursor_pixmap_x = x - cursor_pixmap_w + 1;
 129                         break;
 130                 }
 131
 132                 cursor_pixmap =
 133                         XCreatePixmap (fl_get_display(),
 134                                        fl_root,
 135                                        cursor_pixmap_w,
 136                                        cursor_pixmap_h,
 137                                        fl_get_visual_depth());
 138                 XCopyArea (fl_get_display(),
 139                            owner_.getWin(),
 140                            cursor_pixmap,
 141                            gc_copy,
 142                            owner_.xpos() + cursor_pixmap_x,
 143                            owner_.ypos() + cursor_pixmap_y,
 144                            cursor_pixmap_w,
 145                            cursor_pixmap_h,
 146                            0, 0);
 147                 XDrawLine(fl_get_display(),
 148                           owner_.getWin(),
 149                           gc_copy,
 150                           x + owner_.xpos(),
 151                           y1 + owner_.ypos(),
 152                           x + owner_.xpos(),
 153                           y2 + owner_.ypos());
 154                 switch (shape) {
 155                 case BAR_SHAPE:
 156                         break;
 157                 case L_SHAPE:
 158                 case REVERSED_L_SHAPE:
 159                         int const rectangle_h = (cursor_pixmap_h + 10) / 20;
 160                         XFillRectangle(fl_get_display(),
 161                                        owner_.getWin(),
 162                                        gc_copy,
 163                                        cursor_pixmap_x + owner_.xpos(),
 164                                        y2 - rectangle_h + 1 + owner_.ypos(),
 165                                        cursor_pixmap_w - 1, rectangle_h);
 166                         break;
 167                 }
 168
 169         }
 170         cursor_visible_ = true;
 171 }
 172
 173
 174 void XScreen::hideCursor()
 175 {
 176         if (!cursor_visible_) return;
 177
 178         if (cursor_pixmap) {
 179                 XCopyArea (fl_get_display(),
 180                            cursor_pixmap,
 181                            owner_.getWin(),
 182                            gc_copy,
 183                            0, 0,
 184                            cursor_pixmap_w, cursor_pixmap_h,
 185                            cursor_pixmap_x + owner_.xpos(),
 186                            cursor_pixmap_y + owner_.ypos());
 187         }
 188         cursor_visible_ = false;
 189 }
 190
 191
 192 void XScreen::expose(int x, int y, int w, int h)
 193 {
 194         lyxerr[Debug::GUI] << "expose " << w << "x" << h
 195                 << "+" << x << "+" << y << endl;
 196         XCopyArea(fl_get_display(),
 197                   owner_.getPixmap(),
 198                   owner_.getWin(),
 199                   gc_copy,
 200                   x, y, w, h,
 201                   x + owner_.xpos(),
 202                   y + owner_.ypos());
 203 }
 204
 205
 206 void XScreen::draw(LyXText * text, BufferView * bv, unsigned int y)
 207 {
 208         if (cursor_visible_) hideCursor();
 209
 210         int const old_first = text->first_y;
 211         bool const internal = (text == bv->text);
 212         text->first_y = y;
 213
 214         // is any optimization possible?
 215         if ((y - old_first) < owner_.workHeight()
 216             && (old_first - y) < owner_.workHeight())
 217         {
 218                 if (text->first_y < old_first) {
 219                         drawFromTo(text, bv, 0,
 220                                    old_first - text->first_y, 0, 0, internal);
 221                         XCopyArea (fl_get_display(),
 222                                    owner_.getWin(),
 223                                    owner_.getWin(),
 224                                    gc_copy,
 225                                    owner_.xpos(),
 226                                    owner_.ypos(),
 227                                    owner_.workWidth(),
 228                                    owner_.workHeight() - old_first + text->first_y,
 229                                    owner_.xpos(),
 230                                    owner_.ypos() + old_first - text->first_y
 231                                 );
 232                         // expose the area drawn
 233                         expose(0, 0,
 234                                owner_.workWidth(),
 235                                old_first - text->first_y);
 236                 } else  {
 237                         drawFromTo(text, bv,
 238                                    owner_.workHeight() + old_first - text->first_y,
 239                                    owner_.workHeight(), 0, 0, internal);
 240                         XCopyArea (fl_get_display(),
 241                                    owner_.getWin(),
 242                                    owner_.getWin(),
 243                                    gc_copy,
 244                                    owner_.xpos(),
 245                                    owner_.ypos() + text->first_y - old_first,
 246                                    owner_.workWidth(),
 247                                    owner_.workHeight() + old_first - text->first_y,
 248                                    owner_.xpos(),
 249                                    owner_.ypos());
 250                         // expose the area drawn
 251                         expose(0, owner_.workHeight() + old_first - text->first_y,
 252                                owner_.workWidth(), text->first_y - old_first);
 253                 }
 254         } else {
 255                 // make a dumb new-draw
 256                 drawFromTo(text, bv, 0, owner_.workHeight(), 0, 0, internal);
 257                 expose(0, 0, owner_.workWidth(), owner_.workHeight());
 258         }
 259
 260         XSync(fl_get_display(), 0);
 261 }