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         if (g_tooltip.show_timer_id == 0)
  64                 g_tooltip.show_timer_id = install_timer(0, 0, 0, 0, tooltip_show);
  65         if (g_tooltip.hide_timer_id == 0)
  66                 g_tooltip.hide_timer_id = install_timer(0, 0, 0, 0, tooltip_hide);
  67
  68         XSetWindowAttributes attr;
  69         attr.override_redirect = True;
  70         attr.event_mask = StructureNotifyMask;
  71         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  72         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  73 }
  74
  75
  76 void cleanup_tooltip()
  77 {
  78         stop_timeouts();
  79         tooltip_hide();
  80         g_tooltip.enabled = False;
  81         tooltip_copy_text(0);
  82         if (g_tooltip.window) {
  83                 XDestroyWindow(server.dsp, g_tooltip.window);
  84                 g_tooltip.window = 0;
  85         }
  86         if (g_tooltip.font_desc) {
  87                 pango_font_description_free(g_tooltip.font_desc);
  88                 g_tooltip.font_desc = 0;
  89         }
  90 }
  91
  92
  93 void tooltip_trigger_show(Area* area, Panel* p, int x_root, int y_root)
  94 {
  95         x = x_root;
  96         y = y_root;
  97         g_tooltip.panel = p;
  98         if (g_tooltip.mapped && g_tooltip.area != area) {
  99                 tooltip_copy_text(area);
 100                 tooltip_update();
 101                 stop_timeouts();
 102         }
 103         else if (!g_tooltip.mapped) {
 104                 start_show_timeout();
 105         }
 106 }
 107
 108
 109 void tooltip_show()
 110 {
 111         Area* area = click_area(g_tooltip.panel, x, y);
 112         stop_timeouts();
 113         if (!g_tooltip.mapped && area->_get_tooltip_text) {
 114                 tooltip_copy_text(area);
 115                 g_tooltip.mapped = True;
 116                 XMapWindow(server.dsp, g_tooltip.window);
 117                 XFlush(server.dsp);
 118         }
 119 }
 120
 121
 122 void tooltip_update_geometry()
 123 {
 124         cairo_surface_t *cs;
 125         cairo_t *c;
 126         PangoLayout* layout;
 127         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 128         c = cairo_create(cs);
 129         layout = pango_cairo_create_layout(c);
 130         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 131         pango_layout_set_text(layout, g_tooltip.tooltip_text, -1);
 132         PangoRectangle r1, r2;
 133         pango_layout_get_pixel_extents(layout, &r1, &r2);
 134         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 135         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 136
 137         Panel* panel = g_tooltip.panel;
 138         if (panel_horizontal && panel_position & BOTTOM)
 139                 y = panel->posy-height;
 140         else if (panel_horizontal && panel_position & TOP)
 141                 y = panel->posy + panel->area.height;
 142         else if (panel_position & LEFT)
 143                 x = panel->posx + panel->area.width;
 144         else
 145                 x = panel->posx - width;
 146
 147         g_object_unref(layout);
 148         cairo_destroy(c);
 149         cairo_surface_destroy(cs);
 150 }
 151
 152
 153 void tooltip_adjust_geometry()
 154 {
 155         // adjust coordinates and size to not go offscreen
 156         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 157
 158         int min_x, min_y, max_width, max_height;
 159         Panel* panel = g_tooltip.panel;
 160         int screen_width = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width;
 161         int screen_height = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height;
 162         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 163                 return;    // no adjustment needed
 164
 165         if (panel_horizontal) {
 166                 min_x=0;
 167                 max_width=screen_width;
 168                 max_height=screen_height-panel->area.height;
 169                 if (panel_position & BOTTOM)
 170                         min_y=0;
 171                 else
 172                         min_y=panel->area.height;
 173         }
 174         else {
 175                 max_width=screen_width-panel->area.width;
 176                 min_y=0;
 177                 max_height=screen_height;
 178                 if (panel_position & LEFT)
 179                         min_x=panel->area.width;
 180                 else
 181                         min_x=0;
 182         }
 183
 184         if (x+width > server.monitor[panel->monitor].x + server.monitor[panel->monitor].width)
 185                 x = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width - width;
 186         if ( y+height > server.monitor[panel->monitor].y + server.monitor[panel->monitor].height)
 187                 y = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height - height;
 188
 189         if (x<min_x)
 190                 x=min_x;
 191         if (width>max_width)
 192                 width = max_width;
 193         if (y<min_y)
 194                 y=min_y;
 195         if (height>max_height)
 196                 height=max_height;
 197 }
 198
 199 void tooltip_update()
 200 {
 201         if (!g_tooltip.tooltip_text) {
 202                 tooltip_hide();
 203                 return;
 204         }
 205
 206 //      printf("tooltip_update\n");
 207         tooltip_update_geometry();
 208         tooltip_adjust_geometry();
 209         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 210
 211         // Stuff for drawing the tooltip
 212         cairo_surface_t *cs;
 213         cairo_t *c;
 214         PangoLayout* layout;
 215         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 216         c = cairo_create(cs);
 217         Color bc = g_tooltip.background_color;
 218         cairo_rectangle(c, 0, 0, width, height);
 219         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 220         cairo_fill(c);
 221         Border b = g_tooltip.border;
 222         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 223         cairo_set_line_width(c, b.width);
 224         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 225         cairo_stroke(c);
 226
 227         config_color fc = g_tooltip.font_color;
 228         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 229         layout = pango_cairo_create_layout(c);
 230         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 231         pango_layout_set_text(layout, g_tooltip.tooltip_text, -1);
 232         PangoRectangle r1, r2;
 233         pango_layout_get_pixel_extents(layout, &r1, &r2);
 234         pango_layout_set_width(layout, width*PANGO_SCALE);
 235         pango_layout_set_height(layout, height*PANGO_SCALE);
 236         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 237         // 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.)
 238         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 239         pango_cairo_show_layout (c, layout);
 240
 241         g_object_unref (layout);
 242         cairo_destroy (c);
 243         cairo_surface_destroy (cs);
 244 }
 245
 246
 247 void tooltip_trigger_hide(Tooltip* tooltip)
 248 {
 249         if (g_tooltip.mapped) {
 250                 tooltip_copy_text(0);
 251                 start_hide_timeout();
 252         }
 253         else {
 254                 // tooltip not visible yet, but maybe a timeout is still pending
 255                 stop_timeouts();
 256         }
 257 }
 258
 259
 260 void tooltip_hide()
 261 {
 262         stop_timeouts();
 263         if (g_tooltip.mapped) {
 264                 g_tooltip.mapped = False;
 265                 XUnmapWindow(server.dsp, g_tooltip.window);
 266                 XFlush(server.dsp);
 267         }
 268 }
 269
 270
 271 void start_show_timeout()
 272 {
 273         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 274         struct timespec t = g_tooltip.show_timeout;
 275         if (t.tv_sec == 0 && t.tv_nsec == 0) {
 276                 tooltip_show();
 277         }
 278         else {
 279                 reset_timer(g_tooltip.show_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 280         }
 281 }
 282
 283
 284 void start_hide_timeout()
 285 {
 286         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 287         struct timespec t = g_tooltip.hide_timeout;
 288         if (t.tv_sec == 0 && t.tv_nsec == 0)
 289                 tooltip_hide();
 290         else
 291                 reset_timer(g_tooltip.hide_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 292 }
 293
 294 void stop_timeouts()
 295 {
 296         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 297         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 298 }
 299
 300
 301 void tooltip_copy_text(Area* area)
 302 {
 303         free(g_tooltip.tooltip_text);
 304         if (area && area->_get_tooltip_text)
 305                 g_tooltip.tooltip_text = strdup(area->_get_tooltip_text(area));
 306         else
 307                 g_tooltip.tooltip_text = 0;
 308         g_tooltip.area = area;
 309 }