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 <cairo.h>
  21 #include <cairo-xlib.h>
  22
  23 #include "server.h"
  24 #include "tooltip.h"
  25 #include "panel.h"
  26
  27 // TODO: Use timer_create instead of setitimer, because SIGALRM is not the right signal for this...
  28 // Reason: If we want to implement autohide we have to use another signal...
  29
  30 static int x, y, width, height;
  31
  32 // give the tooltip some reasonable default values
  33 Tooltip g_tooltip = {
  34         .task = 0,
  35         .window = 0,
  36         .show_timeout = { .it_interval={0, 0}, .it_value={0, 0} },
  37         .hide_timeout = { .it_interval={0, 0}, .it_value={0, 0} },
  38         .enabled = False,
  39         .current_state = TOOLTIP_ABOUT_TO_HIDE,
  40         .mapped = False,
  41         .paddingx = 0,
  42         .paddingy = 0,
  43         .font_color = { .color={1, 1, 1}, .alpha=1 },
  44         .background_color = { .color={0.5, 0.4, 0.5}, .alpha=1 },
  45         .border = { .color={0, 0, 0}, .alpha=1,  .width=1, .rounded=0 },
  46         .font_desc = 0
  47 };
  48
  49 void init_tooltip()
  50 {
  51         if (!g_tooltip.font_desc)
  52                 g_tooltip.font_desc = pango_font_description_from_string("sans 10");
  53
  54         XSetWindowAttributes attr;
  55         attr.override_redirect = True;
  56         attr.event_mask = ExposureMask;
  57         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  58         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  59 }
  60
  61
  62 void cleanup_tooltip()
  63 {
  64         tooltip_hide();
  65         g_tooltip.enabled = False;
  66         g_tooltip.current_state = TOOLTIP_ABOUT_TO_HIDE;
  67         if (g_tooltip.task) {
  68                 alarm(0);
  69                 g_tooltip.task = 0;
  70         }
  71         if (g_tooltip.window) {
  72                 XDestroyWindow(server.dsp, g_tooltip.window);
  73                 g_tooltip.window = 0;
  74         }
  75         if (g_tooltip.font_desc) {
  76                 pango_font_description_free(g_tooltip.font_desc);
  77                 g_tooltip.font_desc = 0;
  78         }
  79 }
  80
  81
  82 void tooltip_sighandler(int sig)
  83 {
  84         if (g_tooltip.current_state == TOOLTIP_ABOUT_TO_SHOW)
  85                 tooltip_show();
  86         else if (g_tooltip.current_state == TOOLTIP_ABOUT_TO_HIDE)
  87                 tooltip_hide();
  88 }
  89
  90
  91 void tooltip_trigger_show(Task* task, int x_root, int y_root)
  92 {
  93         x = x_root;
  94         y = y_root;
  95
  96         if (g_tooltip.mapped && g_tooltip.task != task) {
  97                 g_tooltip.task = task;
  98                 tooltip_update();
  99                 alarm(0);
 100         }
 101         else if (!g_tooltip.mapped) {
 102                 g_tooltip.current_state = TOOLTIP_ABOUT_TO_SHOW;
 103                 g_tooltip.task = task;
 104                 struct timeval t = g_tooltip.show_timeout.it_value;
 105                 if (t.tv_sec == 0 && t.tv_usec == 0) {
 106                         alarm(0);
 107                         tooltip_show();
 108                 }
 109                 else
 110                         setitimer(ITIMER_REAL, &g_tooltip.show_timeout, 0);
 111         }
 112 }
 113
 114
 115 void tooltip_show()
 116 {
 117         if (!g_tooltip.mapped) {
 118                 g_tooltip.mapped = True;
 119                 XMapWindow(server.dsp, g_tooltip.window);
 120                 tooltip_update();
 121                 alarm(0);
 122         }
 123 }
 124
 125
 126 void tooltip_update_geometry()
 127 {
 128         cairo_surface_t *cs;
 129         cairo_t *c;
 130         PangoLayout* layout;
 131         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 132         c = cairo_create(cs);
 133         layout = pango_cairo_create_layout(c);
 134         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 135         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 136         PangoRectangle r1, r2;
 137         pango_layout_get_pixel_extents(layout, &r1, &r2);
 138         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 139         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 140
 141         Panel* panel = g_tooltip.task->area.panel;
 142         if (panel_horizontal && panel_position & BOTTOM)
 143                 y = panel->posy-height;
 144         else if (panel_horizontal && panel_position & TOP)
 145                 y = panel->posy + panel->area.height;
 146         else if (panel_position & LEFT)
 147                 x = panel->posx + panel->area.width;
 148         else
 149                         x = panel->posx - width;
 150         g_object_unref(layout);
 151         cairo_destroy(c);
 152         cairo_surface_destroy(cs);
 153 }
 154
 155
 156 void tooltip_adjust_geometry()
 157 {
 158         // adjust coordinates and size to not go offscreen
 159         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 160
 161         int min_x, min_y, max_width, max_height;
 162         Panel* panel = g_tooltip.task->area.panel;
 163         int screen_width = server.monitor[panel->monitor].width;
 164         int screen_height = server.monitor[panel->monitor].height;
 165         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 166                 return;    // no adjustment needed
 167
 168         if (panel_horizontal) {
 169                 min_x=0;
 170                 max_width=screen_width;
 171                 max_height=screen_height-panel->area.height;
 172                 if (panel_position & BOTTOM)
 173                         min_y=0;
 174                 else
 175                         min_y=panel->area.height;
 176         }
 177         else {
 178                 max_width=screen_width-panel->area.width;
 179                 min_y=0;
 180                 max_height=screen_height;
 181                 if (panel_position & LEFT)
 182                         min_x=panel->area.width;
 183                 else
 184                         min_x=0;
 185         }
 186
 187         if (x+width > server.monitor[panel->monitor].width)
 188                 x = server.monitor[panel->monitor].width-width;
 189         if ( y+height>server.monitor[panel->monitor].height)
 190                 y = server.monitor[panel->monitor].height-height;
 191
 192         if (x<min_x)
 193                 x=min_x;
 194         if (width>max_width)
 195                 width = max_width;
 196         if (y<min_y)
 197                 y=min_y;
 198         if (height>max_height)
 199                 height=max_height;
 200 }
 201
 202 void tooltip_update()
 203 {
 204         if (!g_tooltip.task) {
 205                 tooltip_hide();
 206                 return;
 207         }
 208
 209         tooltip_update_geometry();
 210         tooltip_adjust_geometry();
 211         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 212
 213         // Stuff for drawing the tooltip
 214         cairo_surface_t *cs;
 215         cairo_t *c;
 216         PangoLayout* layout;
 217         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 218         c = cairo_create(cs);
 219         Color bc = g_tooltip.background_color;
 220         cairo_rectangle(c, 0, 0, width, height);
 221         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 222         cairo_fill(c);
 223         Border b = g_tooltip.border;
 224         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 225         cairo_set_line_width(c, b.width);
 226         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 227         cairo_stroke(c);
 228
 229         config_color fc = g_tooltip.font_color;
 230         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 231         layout = pango_cairo_create_layout(c);
 232         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 233         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 234         PangoRectangle r1, r2;
 235         pango_layout_get_pixel_extents(layout, &r1, &r2);
 236         pango_layout_set_width(layout, width*PANGO_SCALE);
 237         pango_layout_set_height(layout, height*PANGO_SCALE);
 238         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 239         // 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.)
 240         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 241         pango_cairo_show_layout (c, layout);
 242
 243         g_object_unref (layout);
 244         cairo_destroy (c);
 245         cairo_surface_destroy (cs);
 246 }
 247
 248
 249 void tooltip_trigger_hide(Tooltip* tooltip)
 250 {
 251         if (g_tooltip.mapped) {
 252                 g_tooltip.current_state = TOOLTIP_ABOUT_TO_HIDE;
 253                 struct timeval t = g_tooltip.hide_timeout.it_value;
 254                 g_tooltip.task = 0;
 255                 if (t.tv_sec == 0 && t.tv_usec == 0) {
 256                         tooltip_hide();
 257                         alarm(0);
 258                 }
 259                 else
 260                         setitimer(ITIMER_REAL, &g_tooltip.hide_timeout, 0);
 261         }
 262         else {
 263                 // tooltip not visible yet, but maybe an alarm is still pending
 264                 alarm(0);
 265         }
 266 }
 267
 268
 269 void tooltip_hide()
 270 {
 271         if (g_tooltip.mapped) {
 272                 g_tooltip.mapped = False;
 273                 XUnmapWindow(server.dsp, g_tooltip.window);
 274         }
 275 }