modules/zoom.js

   1 /**
   2  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   3  *
   4  * Portions of this file were derived from Vimperator,
   5  * (C) Copyright 2006-2007 Martin Stubenschrott.
   6  *
   7  * Use, modification, and distribution are subject to the terms specified in the
   8  * COPYING file.
   9 **/
  10
  11 /**
  12  * Text and full-page zoom
  13  */
  14
  15
  16 var zoom_levels = [ 1, 10, 25, 50, 75, 90, 100,
  17                     120, 150, 200, 300, 500, 1000, 2000 ];
  18
  19 function browser_zoom_set(buffer, full_zoom, value) {
  20     if (value < zoom_levels[0])
  21         value = zoom_levels[0];
  22     if (value > zoom_levels[zoom_levels.length - 1])
  23         value = zoom_levels[zoom_levels.length - 1];
  24     buffer.markup_document_viewer[full_zoom ? "fullZoom" : "textZoom"] = value / 100.0;
  25     buffer.window.minibuffer.message((full_zoom ? "Full" : "Text") + " zoom: " + value + "%");
  26 }
  27
  28 function browser_zoom_change(buffer, full_zoom, count) {
  29     if (count == 0)
  30         return;
  31     var zoom = full_zoom ? "fullZoom" : "textZoom";
  32     var cur_value = buffer.markup_document_viewer[zoom] * 100;
  33     var new_level;
  34     if (count < 0) {
  35         new_level = 0;
  36         for (var i = zoom_levels.length - 1; i >= 0; --i)
  37         {
  38             if (zoom_levels[i] - 0.01 < cur_value) {
  39                 new_level = i + count;
  40                 break;
  41             }
  42         }
  43     } else {
  44         new_level = zoom_levels.length - 1;
  45         for (var i = 0; i < zoom_levels.length; ++i)
  46         {
  47             if (zoom_levels[i] + 0.01 > cur_value) {
  48                 new_level = i + count;
  49                 break;
  50             }
  51         }
  52     }
  53
  54     if (new_level < 0)
  55         new_level = 0;
  56     if (new_level >= zoom_levels.length)
  57         new_level = zoom_levels.length - 1;
  58     browser_zoom_set(buffer, full_zoom, zoom_levels[new_level]);
  59 }
  60
  61 interactive("zoom-in-text", null, function (I) {browser_zoom_change(I.buffer, false /* not full zoom */, I.p);});
  62 interactive("zoom-out-text", null, function (I) {browser_zoom_change(I.buffer, false /* not full zoom */, -I.p);});
  63 interactive("zoom-in-text-more", null, function (I) {browser_zoom_change(I.buffer, false /* not full zoom */, I.p * 3);});
  64 interactive("zoom-out-text-more", null, function (I) {browser_zoom_change(I.buffer, false /* not full zoom */, -I.p * 3);});
  65 interactive("zoom-reset-text", null, function (I) {browser_zoom_set(I.buffer, false /* not full zoom */, I.p = 100);});
  66
  67 interactive("zoom-in-full", null, function (I) {browser_zoom_change(I.buffer, true /* full zoom */, I.p);});
  68 interactive("zoom-out-full", null, function (I) {browser_zoom_change(I.buffer, true /* full zoom */, -I.p);});
  69 interactive("zoom-in-full-more", null, function (I) {browser_zoom_change(I.buffer, true /* full zoom */, I.p * 3);});
  70 interactive("zoom-out-full-more", null, function (I) {browser_zoom_change(I.buffer, true /* full zoom */, -I.p * 3);});
  71 interactive("zoom-reset-full", null, function (I) {browser_zoom_set(I.buffer, true /* full zoom */, I.p = 100);});