Dogcows Code - chaz/tint2/blob - src/tooltip/tooltip.c

   1 /**************************************************************************
   2 *
   3 * Copyright (C) 2009 Andreas.Fink (Andreas.Fink85@gmail.com)
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License version 2
   7 * as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16 **************************************************************************/
  17
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <stdlib.h>
  22 #include <cairo.h>
  23 #include <cairo-xlib.h>
  24
  25 #include "server.h"
  26 #include "tooltip.h"
  27 #include "panel.h"
  28 #include "timer.h"
  29
  30 static int x, y, width, height;
  31
  32 // the next functions are helper functions for tooltip handling
  33 void start_show_timeout();
  34 void start_hide_timeout();
  35 void stop_timeouts();
  36 void tooltip_copy_text(Area* area);
  37
  38 // give the tooltip some reasonable default values
  39 Tooltip g_tooltip = {
  40         .tooltip_text = 0,
  41         .area = 0,
  42         .panel = 0,
  43         .window = 0,
  44         .show_timeout = { 0, 0 },
  45         .hide_timeout = { 0, 0 },
  46         .enabled = False,
  47         .mapped = False,
  48         .paddingx = 0,
  49         .paddingy = 0,
  50         .font_color = { .color={1, 1, 1}, .alpha=1 },
  51         .background_color = { .color={0.5, 0.4, 0.5}, .alpha=1 },
  52         .border = { .color={0, 0, 0}, .alpha=1,  .width=1, .rounded=0 },
  53         .font_desc = 0,
  54         .show_timer_id = 0,
  55         .hide_timer_id = 0
  56 };
  57
  58 void init_tooltip()
  59 {
  60         if (!g_tooltip.font_desc)
  61                 g_tooltip.font_desc = pango_font_description_from_string("sans 10");
  62
  63         g_tooltip.show_timer_id = install_timer(0, 0, 0, 0, tooltip_show);
  64         g_tooltip.hide_timer_id = install_timer(0, 0, 0, 0, tooltip_hide);
  65
  66         XSetWindowAttributes attr;
  67         attr.override_redirect = True;
  68         attr.event_mask = StructureNotifyMask;
  69         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  70         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  71 }
  72
  73
  74 void cleanup_tooltip()
  75 {
  76         stop_timeouts();
  77         tooltip_hide();
  78         g_tooltip.enabled = False;
  79         tooltip_copy_text(0);
  80         if (g_tooltip.window) {
  81                 XDestroyWindow(server.dsp, g_tooltip.window);
  82                 g_tooltip.window = 0;
  83         }
  84         if (g_tooltip.font_desc) {
  85                 pango_font_description_free(g_tooltip.font_desc);
  86                 g_tooltip.font_desc = 0;
  87         }
  88 }
  89
  90
  91 void tooltip_trigger_show(Area* area, Panel* p, int x_root, int y_root)
  92 {
  93         x = x_root;
  94         y = y_root;
  95         g_tooltip.panel = p;
  96         if (g_tooltip.mapped && g_tooltip.area != area) {
  97                 tooltip_copy_text(area);
  98                 tooltip_update();
  99                 stop_timeouts();
 100         }
 101         else if (!g_tooltip.mapped) {
 102                 start_show_timeout();
 103         }
 104 }
 105
 106
 107 void tooltip_show()
 108 {
 109   int mx, my;
 110   Window w;
 111   XTranslateCoordinates( server.dsp, server.root_win, g_tooltip.panel->main_win, x, y, &mx, &my, &w);
 112   Area* area = click_area(g_tooltip.panel, mx, my);
 113         stop_timeouts();
 114         if (!g_tooltip.mapped && area->_get_tooltip_text) {
 115                 tooltip_copy_text(area);
 116                 g_tooltip.mapped = True;
 117                 XMapWindow(server.dsp, g_tooltip.window);
 118                 XFlush(server.dsp);
 119         }
 120 }
 121
 122
 123 void tooltip_update_geometry()
 124 {
 125         cairo_surface_t *cs;
 126         cairo_t *c;
 127         PangoLayout* layout;
 128         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 129         c = cairo_create(cs);
 130         layout = pango_cairo_create_layout(c);
 131         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 132         pango_layout_set_text(layout, g_tooltip.tooltip_text, -1);
 133         PangoRectangle r1, r2;
 134         pango_layout_get_pixel_extents(layout, &r1, &r2);
 135         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 136         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 137
 138         Panel* panel = g_tooltip.panel;
 139         if (panel_horizontal && panel_position & BOTTOM)
 140                 y = panel->posy-height;
 141         else if (panel_horizontal && panel_position & TOP)
 142                 y = panel->posy + panel->area.height;
 143         else if (panel_position & LEFT)
 144                 x = panel->posx + panel->area.width;
 145         else
 146                 x = panel->posx - width;
 147
 148         g_object_unref(layout);
 149         cairo_destroy(c);
 150         cairo_surface_destroy(cs);
 151 }
 152
 153
 154 void tooltip_adjust_geometry()
 155 {
 156         // adjust coordinates and size to not go offscreen
 157         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 158
 159         int min_x, min_y, max_width, max_height;
 160         Panel* panel = g_tooltip.panel;
 161         int screen_width = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width;
 162         int screen_height = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height;
 163         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 164                 return;    // no adjustment needed
 165
 166         if (panel_horizontal) {
 167                 min_x=0;
 168                 max_width=screen_width;
 169                 max_height=screen_height-panel->area.height;
 170                 if (panel_position & BOTTOM)
 171                         min_y=0;
 172                 else
 173                         min_y=panel->area.height;
 174         }
 175         else {
 176                 max_width=screen_width-panel->area.width;
 177                 min_y=0;
 178                 max_height=screen_height;
 179                 if (panel_position & LEFT)
 180                         min_x=panel->area.width;
 181                 else
 182                         min_x=0;
 183         }
 184
 185         if (x+width > server.monitor[panel->monitor].x + server.monitor[panel->monitor].width)
 186                 x = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width - width;
 187         if ( y+height > server.monitor[panel->monitor].y + server.monitor[panel->monitor].height)
 188                 y = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height - height;
 189
 190         if (x<min_x)
 191                 x=min_x;
 192         if (width>max_width)
 193                 width = max_width;
 194         if (y<min_y)
 195                 y=min_y;
 196         if (height>max_height)
 197                 height=max_height;
 198 }
 199
 200 void tooltip_update()
 201 {
 202         if (!g_tooltip.tooltip_text) {
 203                 tooltip_hide();
 204                 return;
 205         }
 206
 207 //      printf("tooltip_update\n");
 208         tooltip_update_geometry();
 209         tooltip_adjust_geometry();
 210         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 211
 212         // Stuff for drawing the tooltip
 213         cairo_surface_t *cs;
 214         cairo_t *c;
 215         PangoLayout* layout;
 216         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 217         c = cairo_create(cs);
 218         Color bc = g_tooltip.background_color;
 219         cairo_rectangle(c, 0, 0, width, height);
 220         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 221         cairo_fill(c);
 222         Border b = g_tooltip.border;
 223         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 224         cairo_set_line_width(c, b.width);
 225         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 226         cairo_stroke(c);
 227
 228         config_color fc = g_tooltip.font_color;
 229         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 230         layout = pango_cairo_create_layout(c);
 231         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 232         pango_layout_set_text(layout, g_tooltip.tooltip_text, -1);
 233         PangoRectangle r1, r2;
 234         pango_layout_get_pixel_extents(layout, &r1, &r2);
 235         pango_layout_set_width(layout, width*PANGO_SCALE);
 236         pango_layout_set_height(layout, height*PANGO_SCALE);
 237         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 238         // I do not know why this is the right way, but with the below cairo_move_to it seems to be centered (horiz. and vert.)
 239         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 240         pango_cairo_show_layout (c, layout);
 241
 242         g_object_unref (layout);
 243         cairo_destroy (c);
 244         cairo_surface_destroy (cs);
 245 }
 246
 247
 248 void tooltip_trigger_hide(Tooltip* tooltip)
 249 {
 250         if (g_tooltip.mapped) {
 251                 tooltip_copy_text(0);
 252                 start_hide_timeout();
 253         }
 254         else {
 255                 // tooltip not visible yet, but maybe a timeout is still pending
 256                 stop_timeouts();
 257         }
 258 }
 259
 260
 261 void tooltip_hide()
 262 {
 263         stop_timeouts();
 264         if (g_tooltip.mapped) {
 265                 g_tooltip.mapped = False;
 266                 XUnmapWindow(server.dsp, g_tooltip.window);
 267                 XFlush(server.dsp);
 268         }
 269 }
 270
 271
 272 void start_show_timeout()
 273 {
 274         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 275         struct timespec t = g_tooltip.show_timeout;
 276         if (t.tv_sec == 0 && t.tv_nsec == 0) {
 277                 tooltip_show();
 278         }
 279         else {
 280                 reset_timer(g_tooltip.show_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 281         }
 282 }
 283
 284
 285 void start_hide_timeout()
 286 {
 287         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 288         struct timespec t = g_tooltip.hide_timeout;
 289         if (t.tv_sec == 0 && t.tv_nsec == 0)
 290                 tooltip_hide();
 291         else
 292                 reset_timer(g_tooltip.hide_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 293 }
 294
 295 void stop_timeouts()
 296 {
 297         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 298         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 299 }
 300
 301
 302 void tooltip_copy_text(Area* area)
 303 {
 304         free(g_tooltip.tooltip_text);
 305         if (area && area->_get_tooltip_text)
 306                 g_tooltip.tooltip_text = strdup(area->_get_tooltip_text(area));
 307         else
 308                 g_tooltip.tooltip_text = 0;
 309         g_tooltip.area = area;
 310 }