Dogcows Code - chaz/tint2/blob - src/tooltip/tooltip.c

   1 /**************************************************************************
   2 *
   3 * Copyright (C) 2009 Andreas.Fink85 ()
   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                         tooltip_show();
  87                 else
  88                         setitimer(ITIMER_REAL, &g_tooltip.show_timeout, 0);
  89         }
  90 }
  91
  92
  93 void tooltip_show()
  94 {
  95         if (!g_tooltip.mapped) {
  96                 g_tooltip.mapped = True;
  97                 XMapWindow(server.dsp, g_tooltip.window);
  98                 tooltip_update();
  99                 alarm(0);
 100         }
 101 }
 102
 103
 104 void tooltip_update_geometry()
 105 {
 106         cairo_surface_t *cs;
 107         cairo_t *c;
 108         PangoLayout* layout;
 109         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 110         c = cairo_create(cs);
 111         layout = pango_cairo_create_layout(c);
 112         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 113         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 114         PangoRectangle r1, r2;
 115         pango_layout_get_pixel_extents(layout, &r1, &r2);
 116         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 117         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 118
 119         Panel* panel = g_tooltip.task->area.panel;
 120         if (panel_horizontal && panel_position & BOTTOM)
 121                 y = panel->posy-height;
 122         else if (panel_horizontal && panel_position & TOP)
 123                 y = panel->posy + panel->area.height;
 124         else if (panel_position & LEFT)
 125                 x = panel->posx + panel->area.width;
 126         else
 127                         x = panel->posx - width;
 128         g_object_unref(layout);
 129         cairo_destroy(c);
 130         cairo_surface_destroy(cs);
 131 }
 132
 133
 134 void tooltip_adjust_geometry()
 135 {
 136         // adjust coordinates and size to not go offscreen
 137         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 138
 139         int min_x, min_y, max_width, max_height;
 140         Panel* panel = g_tooltip.task->area.panel;
 141         int screen_width = server.monitor[panel->monitor].width;
 142         int screen_height = server.monitor[panel->monitor].height;
 143         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 144                 return;    // no adjustment needed
 145
 146         if (panel_horizontal) {
 147                 min_x=0;
 148                 max_width=screen_width;
 149                 max_height=screen_height-panel->area.height;
 150                 if (panel_position & BOTTOM)
 151                         min_y=0;
 152                 else
 153                         min_y=panel->area.height;
 154         }
 155         else {
 156                 max_width=screen_width-panel->area.width;
 157                 min_y=0;
 158                 max_height=screen_height;
 159                 if (panel_position & LEFT)
 160                         min_x=panel->area.width;
 161                 else
 162                         min_x=0;
 163         }
 164
 165         if (x+width > server.monitor[panel->monitor].width)
 166                 x = server.monitor[panel->monitor].width-width;
 167         if ( y+height>server.monitor[panel->monitor].height)
 168                 y = server.monitor[panel->monitor].height-height;
 169
 170         if (x<min_x)
 171                 x=min_x;
 172         if (width>max_width)
 173                 width = max_width;
 174         if (y<min_y)
 175                 y=min_y;
 176         if (height>max_height)
 177                 height=max_height;
 178 }
 179
 180 void tooltip_update()
 181 {
 182         if (!g_tooltip.task) {
 183                 tooltip_hide();
 184                 return;
 185         }
 186
 187         tooltip_update_geometry();
 188         tooltip_adjust_geometry();
 189         XMoveResizeWindow(server.dsp, g_tooltip.window, x, y, width, height);
 190
 191         // Stuff for drawing the tooltip
 192         cairo_surface_t *cs;
 193         cairo_t *c;
 194         PangoLayout* layout;
 195         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 196         c = cairo_create(cs);
 197         Color bc = g_tooltip.background_color;
 198         cairo_rectangle(c, 0, 0, width, height);
 199         cairo_set_source_rgb(c, bc.color[0], bc.color[1], bc.color[2]);
 200         cairo_fill(c);
 201         Border b = g_tooltip.border;
 202         cairo_set_source_rgba(c, b.color[0], b.color[1], b.color[2], b.alpha);
 203         cairo_set_line_width(c, b.width);
 204         cairo_rectangle(c, b.width/2.0, b.width/2.0, width-b.width, height-b.width);
 205         cairo_stroke(c);
 206
 207         config_color fc = g_tooltip.font_color;
 208         cairo_set_source_rgba(c, fc.color[0], fc.color[1], fc.color[2], fc.alpha);
 209         layout = pango_cairo_create_layout(c);
 210         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 211         pango_layout_set_text(layout, g_tooltip.task->title, -1);
 212         PangoRectangle r1, r2;
 213         pango_layout_get_pixel_extents(layout, &r1, &r2);
 214         pango_layout_set_width(layout, width*PANGO_SCALE);
 215         pango_layout_set_height(layout, height*PANGO_SCALE);
 216         pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 217         // 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.)
 218         cairo_move_to(c, -r1.x/2+g_tooltip.border.width+g_tooltip.paddingx, -r1.y/2+g_tooltip.border.width+g_tooltip.paddingy);
 219         pango_cairo_show_layout (c, layout);
 220
 221         g_object_unref (layout);
 222         cairo_destroy (c);
 223         cairo_surface_destroy (cs);
 224 }
 225
 226
 227 void tooltip_trigger_hide(Tooltip* tooltip)
 228 {
 229         if (g_tooltip.mapped) {
 230                 g_tooltip.current_state = TOOLTIP_ABOUT_TO_HIDE;
 231                 struct timeval t = g_tooltip.hide_timeout.it_value;
 232                 if (t.tv_sec == 0 && t.tv_usec == 0)
 233                         tooltip_hide();
 234                 else
 235                         setitimer(ITIMER_REAL, &g_tooltip.hide_timeout, 0);
 236         }
 237         else {
 238                 // tooltip not visible yet, but maybe an alarm is still pending
 239                 alarm(0);
 240         }
 241 }
 242
 243
 244 void tooltip_hide()
 245 {
 246         if (g_tooltip.mapped) {
 247                 g_tooltip.mapped = False;
 248                 XUnmapWindow(server.dsp, g_tooltip.window);
 249         }
 250         g_tooltip.task = 0;
 251 }