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 tooltip_sighandler(int sig)
  63 {
  64         if (g_tooltip.current_state == TOOLTIP_ABOUT_TO_SHOW)
  65                 tooltip_show();
  66         else if (g_tooltip.current_state == TOOLTIP_ABOUT_TO_HIDE)
  67                 tooltip_hide();
  68 }
  69
  70
  71 void tooltip_trigger_show(Task* task, int x_root, int y_root)
  72 {
  73         x = x_root;
  74         y = y_root;
  75
  76         if (g_tooltip.mapped && g_tooltip.task != task) {
  77                 g_tooltip.task = task;
  78                 tooltip_update();
  79                 alarm(0);
  80         }
  81         else if (!g_tooltip.mapped) {
  82                 g_tooltip.current_state = TOOLTIP_ABOUT_TO_SHOW;
  83                 g_tooltip.task = task;
  84                 struct timeval t = g_tooltip.show_timeout.it_value;
  85                 if (t.tv_sec == 0 && t.tv_usec == 0) {
  86                         alarm(0);
  87                         tooltip_show();
  88                 }
  89                 else
  90                         setitimer(ITIMER_REAL, &g_tooltip.show_timeout, 0);
  91         }
  92 }
  93
  94
  95 void tooltip_show()
  96 {
  97         if (!g_tooltip.mapped) {
  98                 g_tooltip.mapped = True;
  99                 XMapWindow(server.dsp, g_tooltip.window);
 100                 tooltip_update();
 101                 alarm(0);
 102         }
 103 }
 104
 105
 106 void tooltip_update_geometry()
 107 {
 108         cairo_surface_t *cs;
 109         cairo_t *c;
 110         PangoLayout* layout;
 111         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 112         c = cairo_create(cs);
 113         layout = pango_cairo_create_layout(c);
 114         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 115         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 116         PangoRectangle r1, r2;
 117         pango_layout_get_pixel_extents(layout, &r1, &r2);
 118         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 119         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 120
 121         Panel* panel = g_tooltip.task->area.panel;
 122         if (panel_horizontal && panel_position & BOTTOM)
 123                 y = panel->posy-height;
 124         else if (panel_horizontal && panel_position & TOP)
 125                 y = panel->posy + panel->area.height;
 126         else if (panel_position & LEFT)
 127                 x = panel->posx + panel->area.width;
 128         else
 129                         x = panel->posx - width;
 130         g_object_unref(layout);
 131         cairo_destroy(c);
 132         cairo_surface_destroy(cs);
 133 }
 134
 135
 136 void tooltip_adjust_geometry()
 137 {
 138         // adjust coordinates and size to not go offscreen
 139         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 140
 141         int min_x, min_y, max_width, max_height;
 142         Panel* panel = g_tooltip.task->area.panel;
 143         int screen_width = server.monitor[panel->monitor].width;
 144         int screen_height = server.monitor[panel->monitor].height;
 145         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 146                 return;    // no adjustment needed
 147
 148         if (panel_horizontal) {
 149                 min_x=0;
 150                 max_width=screen_width;
 151                 max_height=screen_height-panel->area.height;
 152                 if (panel_position & BOTTOM)
 153                         min_y=0;
 154                 else
 155                         min_y=panel->area.height;
 156         }
 157         else {
 158                 max_width=screen_width-panel->area.width;
 159                 min_y=0;
 160                 max_height=screen_height;
 161                 if (panel_position & LEFT)
 162                         min_x=panel->area.width;
 163                 else
 164                         min_x=0;
 165         }
 166
 167         if (x+width > server.monitor[panel->monitor].width)
 168                 x = server.monitor[panel->monitor].width-width;
 169         if ( y+height>server.monitor[panel->monitor].height)
 170                 y = server.monitor[panel->monitor].height-height;
 171
 172         if (x<min_x)
 173                 x=min_x;
 174         if (width>max_width)
 175                 width = max_width;
 176         if (y<min_y)
 177                 y=min_y;
 178         if (height>max_height)
 179                 height=max_height;
 180 }
 181
 182 void tooltip_update()
 183 {
 184         if (!g_tooltip.task) {
 185                 tooltip_hide();
 186                 return;
 187         }
 188
 189         tooltip_update_geometry();
 190         tooltip_adjust_geometry();
 191         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 192
 193         // Stuff for drawing the tooltip
 194         cairo_surface_t *cs;
 195         cairo_t *c;
 196         PangoLayout* layout;
 197         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 198         c = cairo_create(cs);
 199         Color bc = g_tooltip.background_color;
 200         cairo_rectangle(c, 0, 0, width, height);
 201         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 202         cairo_fill(c);
 203         Border b = g_tooltip.border;
 204         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 205         cairo_set_line_width(c, b.width);
 206         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 207         cairo_stroke(c);
 208
 209         config_color fc = g_tooltip.font_color;
 210         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 211         layout = pango_cairo_create_layout(c);
 212         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 213         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 214         PangoRectangle r1, r2;
 215         pango_layout_get_pixel_extents(layout, &r1, &r2);
 216         pango_layout_set_width(layout, width*PANGO_SCALE);
 217         pango_layout_set_height(layout, height*PANGO_SCALE);
 218         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 219         // 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.)
 220         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 221         pango_cairo_show_layout (c, layout);
 222
 223         g_object_unref (layout);
 224         cairo_destroy (c);
 225         cairo_surface_destroy (cs);
 226 }
 227
 228
 229 void tooltip_trigger_hide(Tooltip* tooltip)
 230 {
 231         if (g_tooltip.mapped) {
 232                 g_tooltip.current_state = TOOLTIP_ABOUT_TO_HIDE;
 233                 struct timeval t = g_tooltip.hide_timeout.it_value;
 234                 if (t.tv_sec == 0 && t.tv_usec == 0) {
 235                         tooltip_hide();
 236                         alarm(0);
 237                 }
 238                 else
 239                         setitimer(ITIMER_REAL, &g_tooltip.hide_timeout, 0);
 240         }
 241         else {
 242                 // tooltip not visible yet, but maybe an alarm is still pending
 243                 alarm(0);
 244         }
 245 }
 246
 247
 248 void tooltip_hide()
 249 {
 250         if (g_tooltip.mapped) {
 251                 g_tooltip.mapped = False;
 252                 XUnmapWindow(server.dsp, g_tooltip.window);
 253         }
 254         g_tooltip.task = 0;
 255 }