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 #include "timer.h"
  27
  28 static int x, y, width, height;
  29
  30 // the next functions are helper functions for tooltip handling
  31 void start_show_timeout();
  32 void start_hide_timeout();
  33 void stop_timeouts();
  34
  35 // give the tooltip some reasonable default values
  36 Tooltip g_tooltip = {
  37         .task = 0,
  38         .window = 0,
  39         .show_timeout = { 0, 0 },
  40         .hide_timeout = { 0, 0 },
  41         .enabled = False,
  42         .mapped = False,
  43         .paddingx = 0,
  44         .paddingy = 0,
  45         .font_color = { .color={1, 1, 1}, .alpha=1 },
  46         .background_color = { .color={0.5, 0.4, 0.5}, .alpha=1 },
  47         .border = { .color={0, 0, 0}, .alpha=1,  .width=1, .rounded=0 },
  48         .font_desc = 0,
  49         .show_timer_id = 0,
  50         .hide_timer_id = 0
  51 };
  52
  53 void init_tooltip()
  54 {
  55         if (!g_tooltip.font_desc)
  56                 g_tooltip.font_desc = pango_font_description_from_string("sans 10");
  57
  58         if (g_tooltip.show_timer_id == 0)
  59                 g_tooltip.show_timer_id = install_timer(0, 0, 0, 0, tooltip_show);
  60         if (g_tooltip.hide_timer_id == 0)
  61                 g_tooltip.hide_timer_id = install_timer(0, 0, 0, 0, tooltip_hide);
  62
  63         XSetWindowAttributes attr;
  64         attr.override_redirect = True;
  65         attr.event_mask = ExposureMask;
  66         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  67         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  68 }
  69
  70
  71 void cleanup_tooltip()
  72 {
  73         stop_timeouts();
  74         tooltip_hide();
  75         g_tooltip.enabled = False;
  76         if (g_tooltip.task) {
  77                 g_tooltip.task = 0;
  78         }
  79         if (g_tooltip.window) {
  80                 XDestroyWindow(server.dsp, g_tooltip.window);
  81                 g_tooltip.window = 0;
  82         }
  83         if (g_tooltip.font_desc) {
  84                 pango_font_description_free(g_tooltip.font_desc);
  85                 g_tooltip.font_desc = 0;
  86         }
  87 }
  88
  89
  90 void tooltip_trigger_show(Task* task, int x_root, int y_root)
  91 {
  92         x = x_root;
  93         y = y_root;
  94
  95         if (g_tooltip.mapped && g_tooltip.task != task) {
  96                 g_tooltip.task = task;
  97                 tooltip_update();
  98                 stop_timeouts();
  99         }
 100         else if (!g_tooltip.mapped) {
 101                 g_tooltip.task = task;
 102                 start_show_timeout();
 103         }
 104 }
 105
 106
 107 void tooltip_show()
 108 {
 109         if (!g_tooltip.mapped) {
 110                 g_tooltip.mapped = True;
 111                 XMapWindow(server.dsp, g_tooltip.window);
 112                 //tooltip_update();
 113         }
 114 }
 115
 116
 117 void tooltip_update_geometry()
 118 {
 119         cairo_surface_t *cs;
 120         cairo_t *c;
 121         PangoLayout* layout;
 122         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 123         c = cairo_create(cs);
 124         layout = pango_cairo_create_layout(c);
 125         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 126         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 127         PangoRectangle r1, r2;
 128         pango_layout_get_pixel_extents(layout, &r1, &r2);
 129         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 130         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 131
 132         Panel* panel = g_tooltip.task->area.panel;
 133         if (panel_horizontal && panel_position & BOTTOM)
 134                 y = panel->posy-height;
 135         else if (panel_horizontal && panel_position & TOP)
 136                 y = panel->posy + panel->area.height;
 137         else if (panel_position & LEFT)
 138                 x = panel->posx + panel->area.width;
 139         else
 140                 x = panel->posx - width;
 141
 142         g_object_unref(layout);
 143         cairo_destroy(c);
 144         cairo_surface_destroy(cs);
 145 }
 146
 147
 148 void tooltip_adjust_geometry()
 149 {
 150         // adjust coordinates and size to not go offscreen
 151         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 152
 153         int min_x, min_y, max_width, max_height;
 154         Panel* panel = g_tooltip.task->area.panel;
 155         int screen_width = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width;
 156         int screen_height = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height;
 157         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 158                 return;    // no adjustment needed
 159
 160         if (panel_horizontal) {
 161                 min_x=0;
 162                 max_width=screen_width;
 163                 max_height=screen_height-panel->area.height;
 164                 if (panel_position & BOTTOM)
 165                         min_y=0;
 166                 else
 167                         min_y=panel->area.height;
 168         }
 169         else {
 170                 max_width=screen_width-panel->area.width;
 171                 min_y=0;
 172                 max_height=screen_height;
 173                 if (panel_position & LEFT)
 174                         min_x=panel->area.width;
 175                 else
 176                         min_x=0;
 177         }
 178
 179         if (x+width > server.monitor[panel->monitor].x + server.monitor[panel->monitor].width)
 180                 x = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width - width;
 181         if ( y+height > server.monitor[panel->monitor].y + server.monitor[panel->monitor].height)
 182                 y = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height - height;
 183
 184         if (x<min_x)
 185                 x=min_x;
 186         if (width>max_width)
 187                 width = max_width;
 188         if (y<min_y)
 189                 y=min_y;
 190         if (height>max_height)
 191                 height=max_height;
 192 }
 193
 194 void tooltip_update()
 195 {
 196         if (!g_tooltip.task) {
 197                 tooltip_hide();
 198                 return;
 199         }
 200
 201         //printf("tooltip_update\n");
 202         tooltip_update_geometry();
 203         tooltip_adjust_geometry();
 204         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 205
 206         // Stuff for drawing the tooltip
 207         cairo_surface_t *cs;
 208         cairo_t *c;
 209         PangoLayout* layout;
 210         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 211         c = cairo_create(cs);
 212         Color bc = g_tooltip.background_color;
 213         cairo_rectangle(c, 0, 0, width, height);
 214         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 215         cairo_fill(c);
 216         Border b = g_tooltip.border;
 217         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 218         cairo_set_line_width(c, b.width);
 219         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 220         cairo_stroke(c);
 221
 222         config_color fc = g_tooltip.font_color;
 223         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 224         layout = pango_cairo_create_layout(c);
 225         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 226         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 227         PangoRectangle r1, r2;
 228         pango_layout_get_pixel_extents(layout, &r1, &r2);
 229         pango_layout_set_width(layout, width*PANGO_SCALE);
 230         pango_layout_set_height(layout, height*PANGO_SCALE);
 231         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 232         // 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.)
 233         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 234         pango_cairo_show_layout (c, layout);
 235
 236         g_object_unref (layout);
 237         cairo_destroy (c);
 238         cairo_surface_destroy (cs);
 239 }
 240
 241
 242 void tooltip_trigger_hide(Tooltip* tooltip)
 243 {
 244         if (g_tooltip.mapped) {
 245                 g_tooltip.task = 0;
 246                 start_hide_timeout();
 247         }
 248         else {
 249                 // tooltip not visible yet, but maybe a timeout is still pending
 250                 stop_timeouts();
 251         }
 252 }
 253
 254
 255 void tooltip_hide()
 256 {
 257         if (g_tooltip.mapped) {
 258                 g_tooltip.mapped = False;
 259                 XUnmapWindow(server.dsp, g_tooltip.window);
 260         }
 261 }
 262
 263
 264 void start_show_timeout()
 265 {
 266         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 267         struct timespec t = g_tooltip.show_timeout;
 268         if (t.tv_sec == 0 && t.tv_nsec == 0)
 269                 tooltip_show();
 270         else
 271                 reset_timer(g_tooltip.show_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 272 }
 273
 274
 275 void start_hide_timeout()
 276 {
 277         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 278         struct timespec t = g_tooltip.hide_timeout;
 279         if (t.tv_sec == 0 && t.tv_nsec == 0)
 280                 tooltip_hide();
 281         else
 282                 reset_timer(g_tooltip.hide_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 283 }
 284
 285 void stop_timeouts()
 286 {
 287         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 288         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 289 }