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 <string.h>
  21 #include <stdlib.h>
  22 #include <cairo.h>
  23 #include <cairo-xlib.h>
  24
  25 #include "server.h"
  26 #include "tooltip.h"
  27 #include "panel.h"
  28 #include "timer.h"
  29
  30 static int x, y, width, height;
  31
  32 // the next functions are helper functions for tooltip handling
  33 void start_show_timeout();
  34 void start_hide_timeout();
  35 void stop_tooltip_timeout();
  36 void tooltip_copy_text(Area* area);
  37
  38 // give the tooltip some reasonable default values
  39 Tooltip g_tooltip = {
  40         .tooltip_text = 0,
  41         .area = 0,
  42         .panel = 0,
  43         .window = 0,
  44         .show_timeout_msec = 0,
  45         .hide_timeout_msec = 0,
  46         .enabled = False,
  47         .mapped = False,
  48         .paddingx = 0,
  49         .paddingy = 0,
  50         .font_color = { .color={1, 1, 1}, .alpha=1 },
  51         .background_color = { .color={0.5, 0.4, 0.5}, .alpha=1 },
  52         .border = { .color={0, 0, 0}, .alpha=1,  .width=1, .rounded=0 },
  53         .font_desc = 0,
  54         .timeout = 0
  55 };
  56
  57 void init_tooltip()
  58 {
  59         if (!g_tooltip.font_desc)
  60                 g_tooltip.font_desc = pango_font_description_from_string("sans 10");
  61
  62         XSetWindowAttributes attr;
  63         attr.override_redirect = True;
  64         attr.event_mask = StructureNotifyMask;
  65         if (g_tooltip.window) XDestroyWindow(server.dsp, g_tooltip.window);
  66         g_tooltip.window = XCreateWindow(server.dsp, server.root_win, 0, 0, 100, 20, 0, server.depth, InputOutput, CopyFromParent, CWOverrideRedirect|CWEventMask, &attr);
  67 }
  68
  69
  70 void cleanup_tooltip()
  71 {
  72         stop_tooltip_timeout();
  73         tooltip_hide();
  74         g_tooltip.enabled = False;
  75         tooltip_copy_text(0);
  76         if (g_tooltip.window) {
  77                 XDestroyWindow(server.dsp, g_tooltip.window);
  78                 g_tooltip.window = 0;
  79         }
  80         if (g_tooltip.font_desc) {
  81                 pango_font_description_free(g_tooltip.font_desc);
  82                 g_tooltip.font_desc = 0;
  83         }
  84 }
  85
  86
  87 void tooltip_trigger_show(Area* area, Panel* p, int x_root, int y_root)
  88 {
  89         x = x_root;
  90         y = y_root;
  91         g_tooltip.panel = p;
  92         if (g_tooltip.mapped && g_tooltip.area != area) {
  93                 tooltip_copy_text(area);
  94                 tooltip_update();
  95                 stop_tooltip_timeout();
  96         }
  97         else if (!g_tooltip.mapped) {
  98                 start_show_timeout();
  99         }
 100 }
 101
 102
 103 void tooltip_show()
 104 {
 105   int mx, my;
 106   Window w;
 107   XTranslateCoordinates( server.dsp, server.root_win, g_tooltip.panel->main_win, x, y, &mx, &my, &w);
 108   Area* area = click_area(g_tooltip.panel, mx, my);
 109         stop_tooltip_timeout();
 110         if (!g_tooltip.mapped && area->_get_tooltip_text) {
 111                 tooltip_copy_text(area);
 112                 g_tooltip.mapped = True;
 113                 XMapWindow(server.dsp, g_tooltip.window);
 114                 XFlush(server.dsp);
 115         }
 116 }
 117
 118
 119 void tooltip_update_geometry()
 120 {
 121         cairo_surface_t *cs;
 122         cairo_t *c;
 123         PangoLayout* layout;
 124         cs = cairo_xlib_surface_create(server.dsp, g_tooltip.window, server.visual, width, height);
 125         c = cairo_create(cs);
 126         layout = pango_cairo_create_layout(c);
 127         pango_layout_set_font_description(layout, g_tooltip.font_desc);
 128         pango_layout_set_text(layout, g_tooltip.tooltip_text, -1);
 129         PangoRectangle r1, r2;
 130         pango_layout_get_pixel_extents(layout, &r1, &r2);
 131         width = 2*g_tooltip.border.width + 2*g_tooltip.paddingx + r2.width;
 132         height = 2*g_tooltip.border.width + 2*g_tooltip.paddingy + r2.height;
 133
 134         Panel* panel = g_tooltip.panel;
 135         if (panel_horizontal && panel_position & BOTTOM)
 136                 y = panel->posy-height;
 137         else if (panel_horizontal && panel_position & TOP)
 138                 y = panel->posy + panel->area.height;
 139         else if (panel_position & LEFT)
 140                 x = panel->posx + panel->area.width;
 141         else
 142                 x = panel->posx - width;
 143
 144         g_object_unref(layout);
 145         cairo_destroy(c);
 146         cairo_surface_destroy(cs);
 147 }
 148
 149
 150 void tooltip_adjust_geometry()
 151 {
 152         // adjust coordinates and size to not go offscreen
 153         // it seems quite impossible that the height needs to be adjusted, but we do it anyway.
 154
 155         int min_x, min_y, max_width, max_height;
 156         Panel* panel = g_tooltip.panel;
 157         int screen_width = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width;
 158         int screen_height = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height;
 159         if ( x+width <= screen_width && y+height <= screen_height && x>=0 && y>=0)
 160                 return;    // no adjustment needed
 161
 162         if (panel_horizontal) {
 163                 min_x=0;
 164                 max_width=screen_width;
 165                 max_height=screen_height-panel->area.height;
 166                 if (panel_position & BOTTOM)
 167                         min_y=0;
 168                 else
 169                         min_y=panel->area.height;
 170         }
 171         else {
 172                 max_width=screen_width-panel->area.width;
 173                 min_y=0;
 174                 max_height=screen_height;
 175                 if (panel_position & LEFT)
 176                         min_x=panel->area.width;
 177                 else
 178                         min_x=0;
 179         }
 180
 181         if (x+width > server.monitor[panel->monitor].x + server.monitor[panel->monitor].width)
 182                 x = server.monitor[panel->monitor].x + server.monitor[panel->monitor].width - width;
 183         if ( y+height > server.monitor[panel->monitor].y + server.monitor[panel->monitor].height)
 184                 y = server.monitor[panel->monitor].y + server.monitor[panel->monitor].height - height;
 185
 186         if (x<min_x)
 187                 x=min_x;
 188         if (width>max_width)
 189                 width = max_width;
 190         if (y<min_y)
 191                 y=min_y;
 192         if (height>max_height)
 193                 height=max_height;
 194 }
 195
 196 void tooltip_update()
 197 {
 198         if (!g_tooltip.tooltip_text) {
 199                 tooltip_hide();
 200                 return;
 201         }
 202
 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.tooltip_text, -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                 tooltip_copy_text(0);
 247                 start_hide_timeout();
 248         }
 249         else {
 250                 // tooltip not visible yet, but maybe a timeout is still pending
 251                 stop_tooltip_timeout();
 252         }
 253 }
 254
 255
 256 void tooltip_hide()
 257 {
 258         stop_tooltip_timeout();
 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         if (g_tooltip.timeout)
 270                 change_timeout(g_tooltip.timeout, g_tooltip.show_timeout_msec, 0, tooltip_show);
 271         else
 272                 g_tooltip.timeout = add_timeout(g_tooltip.show_timeout_msec, 0, tooltip_show);
 273 }
 274
 275
 276 void start_hide_timeout()
 277 {
 278         if (g_tooltip.timeout)
 279                 change_timeout(g_tooltip.timeout, g_tooltip.hide_timeout_msec, 0, tooltip_hide);
 280         else
 281                 g_tooltip.timeout = add_timeout(g_tooltip.hide_timeout_msec, 0, tooltip_hide);
 282 }
 283
 284
 285 void stop_tooltip_timeout()
 286 {
 287         if (g_tooltip.timeout) {
 288                 stop_timeout(g_tooltip.timeout);
 289                 g_tooltip.timeout = 0;
 290         }
 291 }
 292
 293
 294 void tooltip_copy_text(Area* area)
 295 {
 296         free(g_tooltip.tooltip_text);
 297         if (area && area->_get_tooltip_text)
 298                 g_tooltip.tooltip_text = strdup(area->_get_tooltip_text(area));
 299         else
 300                 g_tooltip.tooltip_text = 0;
 301         g_tooltip.area = area;
 302 }