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         .area = 0,
  38         .panel = 0,
  39         .window = 0,
  40         .show_timeout = { 0, 0 },
  41         .hide_timeout = { 0, 0 },
  42         .enabled = False,
  43         .mapped = False,
  44         .paddingx = 0,
  45         .paddingy = 0,
  46         .font_color = { .color={1, 1, 1}, .alpha=1 },
  47         .background_color = { .color={0.5, 0.4, 0.5}, .alpha=1 },
  48         .border = { .color={0, 0, 0}, .alpha=1,  .width=1, .rounded=0 },
  49         .font_desc = 0,
  50         .show_timer_id = 0,
  51         .hide_timer_id = 0
  52 };
  53
  54 void init_tooltip()
  55 {
  56         if (!g_tooltip.font_desc)
  57                 g_tooltip.font_desc = pango_font_description_from_string("sans 10");
  58
  59         if (g_tooltip.show_timer_id == 0)
  60                 g_tooltip.show_timer_id = install_timer(0, 0, 0, 0, tooltip_show);
  61         if (g_tooltip.hide_timer_id == 0)
  62                 g_tooltip.hide_timer_id = install_timer(0, 0, 0, 0, tooltip_hide);
  63
  64         XSetWindowAttributes attr;
  65         attr.override_redirect = True;
  66         attr.event_mask = StructureNotifyMask;
  67         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  68         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  69 }
  70
  71
  72 void cleanup_tooltip()
  73 {
  74         stop_timeouts();
  75         tooltip_hide();
  76         g_tooltip.enabled = False;
  77         g_tooltip.area = 0;
  78         if (g_tooltip.window) {
  79                 XDestroyWindow(server.dsp, g_tooltip.window);
  80                 g_tooltip.window = 0;
  81         }
  82         if (g_tooltip.font_desc) {
  83                 pango_font_description_free(g_tooltip.font_desc);
  84                 g_tooltip.font_desc = 0;
  85         }
  86 }
  87
  88
  89 void tooltip_trigger_show(Area* area, Panel* p, int x_root, int y_root)
  90 {
  91         x = x_root;
  92         y = y_root;
  93         g_tooltip.panel = p;
  94         if (g_tooltip.mapped && g_tooltip.area != area) {
  95                 g_tooltip.area = area;
  96                 tooltip_update();
  97                 stop_timeouts();
  98         }
  99         else if (!g_tooltip.mapped) {
 100                 start_show_timeout();
 101         }
 102 }
 103
 104
 105 void tooltip_show()
 106 {
 107         Area* area = click_area(g_tooltip.panel, x, y);
 108         stop_timeouts();
 109         if (!g_tooltip.mapped && area->_get_tooltip_text) {
 110                 g_tooltip.area = area;
 111                 g_tooltip.mapped = True;
 112                 XMapWindow(server.dsp, g_tooltip.window);
 113                 XFlush(server.dsp);
 114         }
 115 }
 116
 117
 118 void tooltip_update_geometry()
 119 {
 120         cairo_surface_t *cs;
 121         cairo_t *c;
 122         PangoLayout* layout;
 123         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 124         c = cairo_create(cs);
 125         layout = pango_cairo_create_layout(c);
 126         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 127         pango_layout_set_text(layout, g_tooltip.area->_get_tooltip_text(g_tooltip.area), -1);
 128         PangoRectangle r1, r2;
 129         pango_layout_get_pixel_extents(layout, &r1, &r2);
 130         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 131         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 132
 133         Panel* panel = g_tooltip.panel;
 134         if (panel_horizontal && panel_position & BOTTOM)
 135                 y = panel->posy-height;
 136         else if (panel_horizontal && panel_position & TOP)
 137                 y = panel->posy + panel->area.height;
 138         else if (panel_position & LEFT)
 139                 x = panel->posx + panel->area.width;
 140         else
 141                 x = panel->posx - width;
 142
 143         g_object_unref(layout);
 144         cairo_destroy(c);
 145         cairo_surface_destroy(cs);
 146 }
 147
 148
 149 void tooltip_adjust_geometry()
 150 {
 151         // adjust coordinates and size to not go offscreen
 152         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 153
 154         int min_x, min_y, max_width, max_height;
 155         Panel* panel = g_tooltip.panel;
 156         int screen_width = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width;
 157         int screen_height = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height;
 158         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 159                 return;    // no adjustment needed
 160
 161         if (panel_horizontal) {
 162                 min_x=0;
 163                 max_width=screen_width;
 164                 max_height=screen_height-panel->area.height;
 165                 if (panel_position & BOTTOM)
 166                         min_y=0;
 167                 else
 168                         min_y=panel->area.height;
 169         }
 170         else {
 171                 max_width=screen_width-panel->area.width;
 172                 min_y=0;
 173                 max_height=screen_height;
 174                 if (panel_position & LEFT)
 175                         min_x=panel->area.width;
 176                 else
 177                         min_x=0;
 178         }
 179
 180         if (x+width > server.monitor[panel->monitor].x + server.monitor[panel->monitor].width)
 181                 x = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width - width;
 182         if ( y+height > server.monitor[panel->monitor].y + server.monitor[panel->monitor].height)
 183                 y = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height - height;
 184
 185         if (x<min_x)
 186                 x=min_x;
 187         if (width>max_width)
 188                 width = max_width;
 189         if (y<min_y)
 190                 y=min_y;
 191         if (height>max_height)
 192                 height=max_height;
 193 }
 194
 195 void tooltip_update()
 196 {
 197         if (!g_tooltip.area->_get_tooltip_text) {
 198                 tooltip_hide();
 199                 return;
 200         }
 201
 202 //      printf("tooltip_update\n");
 203         tooltip_update_geometry();
 204         tooltip_adjust_geometry();
 205         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 206
 207         // Stuff for drawing the tooltip
 208         cairo_surface_t *cs;
 209         cairo_t *c;
 210         PangoLayout* layout;
 211         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 212         c = cairo_create(cs);
 213         Color bc = g_tooltip.background_color;
 214         cairo_rectangle(c, 0, 0, width, height);
 215         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 216         cairo_fill(c);
 217         Border b = g_tooltip.border;
 218         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 219         cairo_set_line_width(c, b.width);
 220         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 221         cairo_stroke(c);
 222
 223         config_color fc = g_tooltip.font_color;
 224         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 225         layout = pango_cairo_create_layout(c);
 226         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 227         pango_layout_set_text(layout, g_tooltip.area->_get_tooltip_text(g_tooltip.area), -1);
 228         PangoRectangle r1, r2;
 229         pango_layout_get_pixel_extents(layout, &r1, &r2);
 230         pango_layout_set_width(layout, width*PANGO_SCALE);
 231         pango_layout_set_height(layout, height*PANGO_SCALE);
 232         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 233         // 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.)
 234         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 235         pango_cairo_show_layout (c, layout);
 236
 237         g_object_unref (layout);
 238         cairo_destroy (c);
 239         cairo_surface_destroy (cs);
 240 }
 241
 242
 243 void tooltip_trigger_hide(Tooltip* tooltip)
 244 {
 245         if (g_tooltip.mapped) {
 246                 g_tooltip.area = 0;
 247                 start_hide_timeout();
 248         }
 249         else {
 250                 // tooltip not visible yet, but maybe a timeout is still pending
 251                 stop_timeouts();
 252         }
 253 }
 254
 255
 256 void tooltip_hide()
 257 {
 258         stop_timeouts();
 259         if (g_tooltip.mapped) {
 260                 g_tooltip.mapped = False;
 261                 XUnmapWindow(server.dsp, g_tooltip.window);
 262                 XFlush(server.dsp);
 263         }
 264 }
 265
 266
 267 void start_show_timeout()
 268 {
 269         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 270         struct timespec t = g_tooltip.show_timeout;
 271         if (t.tv_sec == 0 && t.tv_nsec == 0)
 272                 tooltip_show();
 273         else
 274                 reset_timer(g_tooltip.show_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 275 }
 276
 277
 278 void start_hide_timeout()
 279 {
 280         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 281         struct timespec t = g_tooltip.hide_timeout;
 282         if (t.tv_sec == 0 && t.tv_nsec == 0)
 283                 tooltip_hide();
 284         else
 285                 reset_timer(g_tooltip.hide_timer_id, t.tv_sec, t.tv_nsec, 0, 0);
 286 }
 287
 288 void stop_timeouts()
 289 {
 290         reset_timer(g_tooltip.show_timer_id, 0, 0, 0, 0);
 291         reset_timer(g_tooltip.hide_timer_id, 0, 0, 0, 0);
 292 }