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428
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1 /* Generic scrollbar implementation.
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2 Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
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3 Copyright (C) 1995 Free Software Foundation, Inc.
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4 Copyright (C) 1995 Sun Microsystems, Inc.
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5 Copyright (C) 1995 Darrell Kindred <dkindred+@cmu.edu>.
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6
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7 This file is part of XEmacs.
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8
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9 XEmacs is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 2, or (at your option) any
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12 later version.
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13
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with XEmacs; see the file COPYING. If not, write to
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21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 Boston, MA 02111-1307, USA. */
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23
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24 /* Synched up with: Not in FSF. */
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25
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26 /* This file has been Mule-ized. */
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27
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28 #include <config.h>
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29 #include "lisp.h"
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30
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31 #include "buffer.h"
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32 #include "commands.h"
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33 #include "scrollbar.h"
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34 #include "device.h"
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35 #include "frame.h"
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36 #include "glyphs.h"
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37 #include "gutter.h"
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38 #include "window.h"
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39
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40 Lisp_Object Qinit_scrollbar_from_resources;
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41
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42 Lisp_Object Qscrollbar_line_up;
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43 Lisp_Object Qscrollbar_line_down;
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44 Lisp_Object Qscrollbar_page_up;
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45 Lisp_Object Qscrollbar_page_down;
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46 Lisp_Object Qscrollbar_to_top;
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47 Lisp_Object Qscrollbar_to_bottom;
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48 Lisp_Object Qscrollbar_vertical_drag;
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49
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50 Lisp_Object Qscrollbar_char_left;
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51 Lisp_Object Qscrollbar_char_right;
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52 Lisp_Object Qscrollbar_page_left;
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53 Lisp_Object Qscrollbar_page_right;
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54 Lisp_Object Qscrollbar_to_left;
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55 Lisp_Object Qscrollbar_to_right;
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56 Lisp_Object Qscrollbar_horizontal_drag;
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57
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58 #define DEFAULT_SCROLLBAR_WIDTH 15
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59 #define DEFAULT_SCROLLBAR_HEIGHT 15
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60
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61 /* Width and height of the scrollbar. */
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62 Lisp_Object Vscrollbar_width;
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63 Lisp_Object Vscrollbar_height;
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64
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65 /* Scrollbar visibility specifiers */
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66 Lisp_Object Vhorizontal_scrollbar_visible_p;
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67 Lisp_Object Vvertical_scrollbar_visible_p;
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68
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69 /* Scrollbar location specifiers */
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70 Lisp_Object Vscrollbar_on_left_p;
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71 Lisp_Object Vscrollbar_on_top_p;
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72
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73 Lisp_Object Vscrollbar_pointer_glyph;
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74
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75 EXFUN (Fcenter_to_window_line, 2);
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76
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77 static void update_scrollbar_instance (struct window *w, int vertical,
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78 struct scrollbar_instance *instance);
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79
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80
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81 static void
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82 free_scrollbar_instance (struct scrollbar_instance *instance,
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83 struct frame *frame)
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84 {
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85 if (!instance)
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86 return;
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87 else
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88 {
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89 struct device *d = XDEVICE (frame->device);
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90
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91 MAYBE_DEVMETH (d, free_scrollbar_instance, (instance));
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92 xfree (instance);
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93 }
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94 }
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95
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96 static void
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97 free_window_mirror_scrollbars (struct window_mirror *mir)
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98 {
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99 free_scrollbar_instance (mir->scrollbar_vertical_instance, mir->frame);
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100 mir->scrollbar_vertical_instance = 0;
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101
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102 free_scrollbar_instance (mir->scrollbar_horizontal_instance, mir->frame);
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103 mir->scrollbar_horizontal_instance = 0;
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104 }
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105
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106 static struct window_mirror *
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107 free_scrollbars_loop (Lisp_Object window, struct window_mirror *mir)
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108 {
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109 struct window_mirror *retval = NULL;
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110
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111 while (mir)
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112 {
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113 assert (!NILP (window));
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114
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115 if (mir->vchild)
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116 {
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117 retval = free_scrollbars_loop (XWINDOW (window)->vchild,
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118 mir->vchild);
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119 }
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120 else if (mir->hchild)
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121 {
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122 retval = free_scrollbars_loop (XWINDOW (window)->hchild,
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123 mir->hchild);
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124 }
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125
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126 if (retval != NULL)
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127 return retval;
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128
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129 if (mir->scrollbar_vertical_instance ||
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130 mir->scrollbar_horizontal_instance)
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131 free_window_mirror_scrollbars (mir);
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132
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133 mir = mir->next;
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134 window = XWINDOW (window)->next;
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135 }
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136
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137 return NULL;
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138 }
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139
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140 /* Destroy all scrollbars associated with FRAME. Only called from
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141 delete_frame_internal. */
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142 void
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143 free_frame_scrollbars (struct frame *f)
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144 {
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145 if (!HAS_FRAMEMETH_P (f, create_scrollbar_instance))
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146 return;
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147
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148 if (f->mirror_dirty)
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149 update_frame_window_mirror (f);
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150
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151 free_scrollbars_loop (f->root_window, f->root_mirror);
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152
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153 while (FRAME_SB_VCACHE (f))
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154 {
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155 struct scrollbar_instance *tofree = FRAME_SB_VCACHE (f);
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156 FRAME_SB_VCACHE (f) = FRAME_SB_VCACHE (f)->next;
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157 tofree->next = NULL;
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158 free_scrollbar_instance (tofree, f);
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159 }
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160
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161 while (FRAME_SB_HCACHE (f))
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162 {
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163 struct scrollbar_instance *tofree = FRAME_SB_HCACHE (f);
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164 FRAME_SB_HCACHE (f) = FRAME_SB_HCACHE (f)->next;
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165 tofree->next = NULL;
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166 free_scrollbar_instance (tofree, f);
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167 }
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168 }
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169
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170
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171 static struct scrollbar_instance *
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172 create_scrollbar_instance (struct frame *f, int vertical)
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173 {
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174 struct device *d = XDEVICE (f->device);
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175 struct scrollbar_instance *instance =
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176 xnew_and_zero (struct scrollbar_instance);
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177
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178 MAYBE_DEVMETH (d, create_scrollbar_instance, (f, vertical, instance));
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179
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180 return instance;
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181 }
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182
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183
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184 #define GET_SCROLLBAR_INSTANCE_INTERNAL(cache) \
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185 do { \
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186 if (FRAME_SB_##cache (f)) \
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187 { \
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188 struct scrollbar_instance *retval = FRAME_SB_##cache (f); \
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189 FRAME_SB_##cache (f) = FRAME_SB_##cache (f)->next; \
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190 retval->next = NULL; \
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191 return retval; \
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192 } \
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193 } while (0)
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194
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195 static struct scrollbar_instance *
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196 get_scrollbar_instance (struct frame *f, int vertical)
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197 {
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198 /* Check if there are any available scrollbars already in existence. */
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199 if (vertical)
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200 GET_SCROLLBAR_INSTANCE_INTERNAL (VCACHE);
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201 else
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202 GET_SCROLLBAR_INSTANCE_INTERNAL (HCACHE);
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203
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204 return create_scrollbar_instance (f, vertical);
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205 }
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206 #undef GET_SCROLLBAR_INSTANCE_INTERNAL
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207
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208 #define RELEASE_SCROLLBAR_INSTANCE_INTERNAL(cache) \
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209 do { \
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210 if (!FRAME_SB_##cache (f)) \
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211 { \
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212 instance->next = NULL; \
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213 FRAME_SB_##cache (f) = instance; \
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214 } \
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215 else \
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216 { \
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217 instance->next = FRAME_SB_##cache (f); \
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218 FRAME_SB_##cache (f) = instance; \
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219 } \
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220 } while (0)
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221
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222 static void
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223 release_scrollbar_instance (struct frame *f, int vertical,
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224 struct scrollbar_instance *instance)
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225 {
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226 /* #### should we do "instance->mir = 0;" for safety? */
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227 if (vertical)
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228 RELEASE_SCROLLBAR_INSTANCE_INTERNAL (VCACHE);
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229 else
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230 RELEASE_SCROLLBAR_INSTANCE_INTERNAL (HCACHE);
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231 }
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232 #undef RELEASE_SCROLLBAR_INSTANCE_INTERNAL
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233
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234 #ifdef MEMORY_USAGE_STATS
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235
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236 int
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237 compute_scrollbar_instance_usage (struct device *d,
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238 struct scrollbar_instance *inst,
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239 struct overhead_stats *ovstats)
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240 {
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241 int total = 0;
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242
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243 total += DEVMETH (d, compute_scrollbar_instance_usage, (d, inst, ovstats));
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244
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245 while (inst)
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246 {
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247 total += malloced_storage_size (inst, sizeof (*inst), ovstats);
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248 inst = inst->next;
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249 }
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250
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251 return total;
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252 }
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253
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254 #endif /* MEMORY_USAGE_STATS */
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255
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256 void
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257 update_window_scrollbars (struct window *w, struct window_mirror *mirror,
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258 int active, int horiz_only)
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259 {
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260 struct frame *f = XFRAME (w->frame);
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261 struct device *d = XDEVICE (f->device);
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262
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263 if (!HAS_DEVMETH_P (d, create_scrollbar_instance))
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264 return;
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265
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266 in_display++;
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267
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268 /* It is possible for this to get called from the mirror update
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269 routines. In that case the structure is in an indeterminate
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270 state but we know exactly what struct we are working with. So we
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271 pass it in in that case. We also take advantage of it at some
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272 other points where we know what the mirror struct is. */
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273 if (!mirror)
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274 mirror = find_window_mirror (w);
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275
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276 if (!mirror->scrollbar_vertical_instance && active)
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277 mirror->scrollbar_vertical_instance = get_scrollbar_instance (f, 1);
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278
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279 if (!mirror->scrollbar_horizontal_instance && active)
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280 mirror->scrollbar_horizontal_instance = get_scrollbar_instance (f, 0);
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281
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282 if (!horiz_only && mirror->scrollbar_vertical_instance)
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283 {
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284 int size = (active ? window_scrollbar_width (w) : 0);
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285 struct scrollbar_instance *instance;
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286
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287 instance = mirror->scrollbar_vertical_instance;
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288 instance->scrollbar_is_active = active;
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289 instance->mirror = mirror;
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290
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291 if (active && size)
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292 update_scrollbar_instance (w, 1, instance);
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293 MAYBE_DEVMETH (d, update_scrollbar_instance_status,
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294 (w, active, size, instance));
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295
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296 if (!active)
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297 {
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298 release_scrollbar_instance (f, 1, instance);
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299 mirror->scrollbar_vertical_instance = NULL;
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300 }
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301 }
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302
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303 if (mirror->scrollbar_horizontal_instance)
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304 {
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305 int size = (active ? window_scrollbar_height (w) : 0);
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306 struct scrollbar_instance *instance;
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307
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308 instance = mirror->scrollbar_horizontal_instance;
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309 instance->scrollbar_is_active = active;
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310 instance->mirror = mirror;
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311
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312 if (active && size)
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313 update_scrollbar_instance (w, 0, instance);
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314 MAYBE_DEVMETH (d, update_scrollbar_instance_status,
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315 (w, active, size, instance));
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316
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317 if (!active)
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318 {
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319 release_scrollbar_instance (f, 0, instance);
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320 mirror->scrollbar_horizontal_instance = NULL;
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321 }
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322 }
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323
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324 in_display--;
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325 }
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326
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327 void
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328 release_window_mirror_scrollbars (struct window_mirror *mir)
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329 {
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330 struct device *d = XDEVICE (mir->frame->device);
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331
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332 if (!HAS_DEVMETH_P (d, create_scrollbar_instance))
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333 return;
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334
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335 if (mir->scrollbar_vertical_instance)
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336 {
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337 release_scrollbar_instance (mir->frame, 1,
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338 mir->scrollbar_vertical_instance);
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339 MAYBE_DEVMETH (d, release_scrollbar_instance,
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340 (mir->scrollbar_vertical_instance));
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341 }
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342 mir->scrollbar_vertical_instance = 0;
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343
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344 if (mir->scrollbar_horizontal_instance)
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345 {
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346 release_scrollbar_instance (mir->frame, 0,
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347 mir->scrollbar_horizontal_instance);
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348 MAYBE_DEVMETH (d, release_scrollbar_instance,
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349 (mir->scrollbar_horizontal_instance));
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350 }
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351 mir->scrollbar_horizontal_instance = 0;
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352 }
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353
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354 /*
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355 * If w->sb_point is on the top line then return w->sb_point else
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356 * return w->start. If flag, then return beginning point of line
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357 * which w->sb_point lies on.
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358 */
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359 static Bufpos
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360 scrollbar_point (struct window *w, int flag)
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361 {
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362 Bufpos start_pos, end_pos, sb_pos;
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363 Lisp_Object buf;
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364 struct buffer *b;
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365
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366 if (NILP (w->buffer)) /* non-leaf window */
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367 return 0;
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368
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369 start_pos = marker_position (w->start[CURRENT_DISP]);
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370 sb_pos = marker_position (w->sb_point);
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371
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372 if (!flag && sb_pos < start_pos)
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373 return start_pos;
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374
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375 buf = get_buffer (w->buffer, 0);
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376 if (!NILP (buf))
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377 b = XBUFFER (buf);
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378 else
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379 return start_pos;
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380
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381 if (flag)
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382 end_pos = find_next_newline_no_quit (b, sb_pos, -1);
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383 else
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384 end_pos = find_next_newline_no_quit (b, start_pos, 1);
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385
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386 if (flag)
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387 return end_pos;
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388 else if (sb_pos > end_pos)
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389 return start_pos;
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390 else
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391 return sb_pos;
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392 }
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393
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394 /*
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395 * Update a window's horizontal or vertical scrollbar.
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396 */
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397 static void
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398 update_scrollbar_instance (struct window *w, int vertical,
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399 struct scrollbar_instance *instance)
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400 {
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401 struct frame *f = XFRAME (w->frame);
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402 struct device *d = XDEVICE (f->device);
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403 struct buffer *b = XBUFFER (w->buffer);
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404 Bufpos start_pos, end_pos, sb_pos;
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405 int scrollbar_width = window_scrollbar_width (w);
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406 int scrollbar_height = window_scrollbar_height (w);
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407
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408 int new_line_increment = -1, new_page_increment = -1;
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409 int new_minimum = -1, new_maximum = -1;
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410 int new_slider_size = -1, new_slider_position = -1;
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411 int new_width = -1, new_height = -1, new_x = -1, new_y = -1;
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412 struct window *new_window = 0; /* kludge city */
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413
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414 end_pos = BUF_Z (b) - w->window_end_pos[CURRENT_DISP];
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415 sb_pos = scrollbar_point (w, 0);
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416 start_pos = sb_pos;
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417
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418 /* The end position must be strictly greater than the start
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419 position, at least for the Motify scrollbar. It shouldn't hurt
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|
|
420 anything for other scrollbar implementations. */
|
|
|
421 if (end_pos <= start_pos)
|
|
|
422 end_pos = start_pos + 1;
|
|
|
423
|
|
|
424 if (vertical)
|
|
|
425 {
|
|
|
426 new_height = WINDOW_TEXT_HEIGHT (w);
|
|
|
427 new_width = scrollbar_width;
|
|
|
428 }
|
|
|
429 else
|
|
|
430 {
|
|
|
431 new_height = scrollbar_height;
|
|
|
432 new_width = WINDOW_TEXT_WIDTH (w);
|
|
|
433 }
|
|
|
434
|
|
|
435 /* If the height and width are not greater than 0, then later on the
|
|
|
436 Motif widgets will bitch and moan. */
|
|
|
437 if (new_height <= 0)
|
|
|
438 new_height = 1;
|
|
|
439 if (new_width <= 0)
|
|
|
440 new_width = 1;
|
|
|
441
|
|
|
442 assert (instance->mirror && XWINDOW (real_window(instance->mirror, 0)) == w);
|
|
|
443
|
|
|
444 /* Only character-based scrollbars are implemented at the moment.
|
|
|
445 Line-based will be implemented in the future. */
|
|
|
446
|
|
|
447 instance->scrollbar_is_active = 1;
|
|
|
448 new_line_increment = 1;
|
|
|
449 new_page_increment = 1;
|
|
|
450
|
|
|
451 /* We used to check for inhibit_scrollbar_slider_size_change here,
|
|
|
452 but that seems bogus. */
|
|
|
453 {
|
|
|
454 int x_offset, y_offset;
|
|
|
455
|
|
|
456 /* Scrollbars are always the farthest from the text area, barring
|
|
|
457 gutters. */
|
|
|
458 if (vertical)
|
|
|
459 {
|
|
|
460 if (!NILP (w->scrollbar_on_left_p))
|
|
|
461 {
|
|
|
462 x_offset = WINDOW_LEFT (w);
|
|
|
463 if (window_is_leftmost (w))
|
|
|
464 x_offset += FRAME_LEFT_GUTTER_BOUNDS (f);
|
|
|
465 }
|
|
|
466 else
|
|
|
467 {
|
|
|
468 x_offset = WINDOW_RIGHT (w) - scrollbar_width;
|
|
|
469 if (window_is_rightmost (w))
|
|
|
470 x_offset -= FRAME_RIGHT_GUTTER_BOUNDS (f);
|
|
|
471 if (window_needs_vertical_divider (w))
|
|
|
472 x_offset -= window_divider_width (w);
|
|
|
473 }
|
|
|
474 y_offset = WINDOW_TEXT_TOP (w) + f->scrollbar_y_offset;
|
|
|
475 }
|
|
|
476 else
|
|
|
477 {
|
|
|
478 x_offset = WINDOW_TEXT_LEFT (w);
|
|
|
479 y_offset = f->scrollbar_y_offset;
|
|
|
480
|
|
|
481 if (!NILP (w->scrollbar_on_top_p))
|
|
|
482 {
|
|
|
483 y_offset += WINDOW_TOP (w);
|
|
|
484 if (window_is_highest (w))
|
|
|
485 y_offset += FRAME_TOP_GUTTER_BOUNDS (f);
|
|
|
486 }
|
|
|
487 else
|
|
|
488 {
|
|
|
489 y_offset += WINDOW_TEXT_BOTTOM (w);
|
|
|
490 }
|
|
|
491 }
|
|
|
492
|
|
|
493 new_x = x_offset;
|
|
|
494 new_y = y_offset;
|
|
|
495 }
|
|
|
496
|
|
|
497 /* A disabled scrollbar has its slider sized to the entire height of
|
|
|
498 the scrollbar. Currently the minibuffer scrollbar is
|
|
|
499 disabled. */
|
|
|
500 if (!MINI_WINDOW_P (w) && vertical)
|
|
|
501 {
|
|
|
502 if (!DEVMETH_OR_GIVEN (d, inhibit_scrollbar_slider_size_change, (), 0))
|
|
|
503 {
|
|
|
504 new_minimum = BUF_BEGV (b);
|
|
|
505 new_maximum = max (BUF_ZV (b), new_minimum + 1);
|
|
|
506 new_slider_size = min ((end_pos - start_pos),
|
|
|
507 (new_maximum - new_minimum));
|
|
|
508 new_slider_position = sb_pos;
|
|
|
509 new_window = w;
|
|
|
510 }
|
|
|
511 }
|
|
|
512 else if (!MINI_WINDOW_P (w))
|
|
|
513 {
|
|
|
514 /* The minus one is to account for the truncation glyph. */
|
|
|
515 int wcw = window_char_width (w, 0) - 1;
|
|
|
516 int max_width, max_slide;
|
|
|
517
|
|
|
518 if (w->max_line_len < wcw)
|
|
|
519 {
|
|
|
520 max_width = 1;
|
|
|
521 max_slide = 1;
|
|
|
522 wcw = 1;
|
|
|
523 }
|
|
|
524 else
|
|
|
525 {
|
|
|
526 max_width = w->max_line_len + 2;
|
|
|
527 max_slide = max_width - wcw;
|
|
|
528 }
|
|
|
529
|
|
|
530 new_minimum = 0;
|
|
|
531 new_maximum = max_width;
|
|
|
532 new_slider_size = wcw;
|
|
|
533 new_slider_position = min (w->hscroll, max_slide);
|
|
|
534 }
|
|
|
535 else /* MINI_WINDOW_P (w) */
|
|
|
536 {
|
|
|
537 new_minimum = 1;
|
|
|
538 new_maximum = 2;
|
|
|
539 new_slider_size = 1;
|
|
|
540 new_slider_position = 1;
|
|
|
541 instance->scrollbar_is_active = 0;
|
|
|
542 }
|
|
|
543
|
|
|
544 DEVMETH (d, update_scrollbar_instance_values, (w, instance,
|
|
|
545 new_line_increment,
|
|
|
546 new_page_increment,
|
|
|
547 new_minimum,
|
|
|
548 new_maximum,
|
|
|
549 new_slider_size,
|
|
|
550 new_slider_position,
|
|
|
551 new_width, new_height,
|
|
|
552 new_x, new_y));
|
|
|
553 }
|
|
|
554
|
|
|
555 void
|
|
|
556 init_frame_scrollbars (struct frame *f)
|
|
|
557 {
|
|
|
558 struct device *d = XDEVICE (f->device);
|
|
|
559
|
|
|
560 if (HAS_DEVMETH_P (d, create_scrollbar_instance))
|
|
|
561 {
|
|
|
562 int depth = unlock_ghost_specifiers_protected ();
|
|
|
563 Lisp_Object frame;
|
|
|
564 XSETFRAME (frame, f);
|
|
|
565 call_critical_lisp_code (XDEVICE (FRAME_DEVICE (f)),
|
|
|
566 Qinit_scrollbar_from_resources,
|
|
|
567 frame);
|
|
|
568 unbind_to (depth, Qnil);
|
|
|
569 }
|
|
|
570 }
|
|
|
571
|
|
|
572 void
|
|
|
573 init_device_scrollbars (struct device *d)
|
|
|
574 {
|
|
|
575 if (HAS_DEVMETH_P (d, create_scrollbar_instance))
|
|
|
576 {
|
|
|
577 int depth = unlock_ghost_specifiers_protected ();
|
|
|
578 Lisp_Object device;
|
|
|
579 XSETDEVICE (device, d);
|
|
|
580 call_critical_lisp_code (d,
|
|
|
581 Qinit_scrollbar_from_resources,
|
|
|
582 device);
|
|
|
583 unbind_to (depth, Qnil);
|
|
|
584 }
|
|
|
585 }
|
|
|
586
|
|
|
587 void
|
|
|
588 init_global_scrollbars (struct device *d)
|
|
|
589 {
|
|
|
590 if (HAS_DEVMETH_P (d, create_scrollbar_instance))
|
|
|
591 {
|
|
|
592 int depth = unlock_ghost_specifiers_protected ();
|
|
|
593 call_critical_lisp_code (d,
|
|
|
594 Qinit_scrollbar_from_resources,
|
|
|
595 Qglobal);
|
|
|
596 unbind_to (depth, Qnil);
|
|
|
597 }
|
|
|
598 }
|
|
|
599
|
|
|
600 static void
|
|
|
601 vertical_scrollbar_changed_in_window (Lisp_Object specifier,
|
|
|
602 struct window *w,
|
|
|
603 Lisp_Object oldval)
|
|
|
604 {
|
|
|
605 /* Hold on your cerebella guys. If we always show the dividers,
|
|
|
606 changing scrollbar affects only how the text and scrollbar are
|
|
|
607 laid out in the window. If we do not want the dividers to show up
|
|
|
608 always, then we mark more drastic change, because changing
|
|
|
609 divider appearance changes lotta things. Although we actually need
|
|
|
610 to do this only if the scrollbar has appeared or disappeared
|
|
|
611 completely at either window edge, we do this always, as users
|
|
|
612 usually do not reposition scrollbars 200 times a second or so. Do
|
|
|
613 you? */
|
|
|
614 if (NILP (w->vertical_divider_always_visible_p))
|
|
|
615 MARK_FRAME_WINDOWS_STRUCTURE_CHANGED (XFRAME (WINDOW_FRAME (w)));
|
|
|
616 else
|
|
|
617 MARK_WINDOWS_CHANGED (w);
|
|
|
618 }
|
|
|
619
|
|
|
620 /* This function is called as a result of a change to the
|
|
|
621 `scrollbar-pointer' glyph. */
|
|
|
622 static void
|
|
|
623 scrollbar_pointer_changed_in_window (Lisp_Object specifier, struct window *w,
|
|
|
624 Lisp_Object oldval)
|
|
|
625 {
|
|
|
626 struct frame *f = XFRAME (WINDOW_FRAME (w));
|
|
|
627
|
|
|
628 if (f->init_finished)
|
|
|
629 MAYBE_FRAMEMETH (f, scrollbar_pointer_changed_in_window, (w));
|
|
|
630 }
|
|
|
631
|
|
|
632 /* ####
|
|
|
633
|
|
|
634 All of the following stuff is functions that handle scrollbar
|
|
|
635 actions. All of it should be moved into Lisp. This may require
|
|
|
636 adding some badly-needed primitives. */
|
|
|
637
|
|
|
638 /********** vertical scrollbar stuff **********/
|
|
|
639
|
|
|
640 /*
|
|
|
641 * If the original point is still visible, put the cursor back there.
|
|
|
642 * Otherwise, when scrolling down stick it at the beginning of the
|
|
|
643 * first visible line and when scrolling up stick it at the beginning
|
|
|
644 * of the last visible line.
|
|
|
645 */
|
|
|
646
|
|
|
647 /* #### This function should be moved into Lisp */
|
|
|
648 static void
|
|
|
649 scrollbar_reset_cursor (Lisp_Object win, Lisp_Object orig_pt)
|
|
|
650 {
|
|
|
651 /* When this function is called we know that start is already
|
|
|
652 accurate. We know this because either set-window-start or
|
|
|
653 recenter was called immediately prior to it being called. */
|
|
|
654 Lisp_Object buf;
|
|
|
655 Bufpos start_pos = XINT (Fwindow_start (win));
|
|
|
656 Bufpos ptint = XINT (orig_pt);
|
|
|
657 struct window *w = XWINDOW (win);
|
|
|
658 int selected = ((w == XWINDOW (Fselected_window (XFRAME (w->frame)->device)))
|
|
|
659 ? 1
|
|
|
660 : 0);
|
|
|
661
|
|
|
662 buf = Fwindow_buffer (win);
|
|
|
663 if (NILP (buf))
|
|
|
664 return; /* the window was deleted out from under us */
|
|
|
665
|
|
|
666 if (ptint < XINT (Fwindow_start (win)))
|
|
|
667 {
|
|
|
668 if (selected)
|
|
|
669 Fgoto_char (make_int (start_pos), buf);
|
|
|
670 else
|
|
|
671 Fset_window_point (win, make_int (start_pos));
|
|
|
672 }
|
|
|
673 else if (!point_would_be_visible (XWINDOW (win), start_pos, ptint))
|
|
|
674 {
|
|
|
675 Fmove_to_window_line (make_int (-1), win);
|
|
|
676
|
|
|
677 if (selected)
|
|
|
678 Fbeginning_of_line (Qnil, buf);
|
|
|
679 else
|
|
|
680 {
|
|
|
681 /* #### Taken from forward-line. */
|
|
|
682 Bufpos pos;
|
|
|
683
|
|
|
684 pos = find_next_newline (XBUFFER (buf),
|
|
|
685 marker_position (w->pointm[CURRENT_DISP]),
|
|
|
686 -1);
|
|
|
687 Fset_window_point (win, make_int (pos));
|
|
|
688 }
|
|
|
689 }
|
|
|
690 else
|
|
|
691 {
|
|
|
692 if (selected)
|
|
|
693 Fgoto_char (orig_pt, buf);
|
|
|
694 else
|
|
|
695 Fset_window_point (win, orig_pt);
|
|
|
696 }
|
|
|
697 }
|
|
|
698
|
|
|
699 DEFUN ("scrollbar-line-up", Fscrollbar_line_up, 1, 1, 0, /*
|
|
|
700 Function called when the line-up arrow on the scrollbar is clicked.
|
|
|
701 This is the little arrow at the top of the scrollbar. One argument, the
|
|
|
702 scrollbar's window. You can advise this function to change the scrollbar
|
|
|
703 behavior.
|
|
|
704 */
|
|
|
705 (window))
|
|
|
706 {
|
|
|
707 CHECK_LIVE_WINDOW (window);
|
|
|
708 window_scroll (window, make_int (1), -1, ERROR_ME_NOT);
|
|
|
709 zmacs_region_stays = 1;
|
|
|
710 return Qnil;
|
|
|
711 }
|
|
|
712
|
|
|
713 DEFUN ("scrollbar-line-down", Fscrollbar_line_down, 1, 1, 0, /*
|
|
|
714 Function called when the line-down arrow on the scrollbar is clicked.
|
|
|
715 This is the little arrow at the bottom of the scrollbar. One argument, the
|
|
|
716 scrollbar's window. You can advise this function to change the scrollbar
|
|
|
717 behavior.
|
|
|
718 */
|
|
|
719 (window))
|
|
|
720 {
|
|
|
721 CHECK_LIVE_WINDOW (window);
|
|
|
722 window_scroll (window, make_int (1), 1, ERROR_ME_NOT);
|
|
|
723 zmacs_region_stays = 1;
|
|
|
724 return Qnil;
|
|
|
725 }
|
|
|
726
|
|
|
727 DEFUN ("scrollbar-page-up", Fscrollbar_page_up, 1, 1, 0, /*
|
|
|
728 Function called when the user gives the "page-up" scrollbar action.
|
|
|
729 \(The way this is done can vary from scrollbar to scrollbar.) One argument,
|
|
|
730 a cons containing the scrollbar's window and a value (#### document me!
|
|
|
731 This value is nil for Motif/Lucid scrollbars and a number for Athena
|
|
|
732 scrollbars). You can advise this function to change the scrollbar
|
|
|
733 behavior.
|
|
|
734 */
|
|
|
735 (object))
|
|
|
736 {
|
|
|
737 Lisp_Object window = Fcar (object);
|
|
|
738
|
|
|
739 CHECK_LIVE_WINDOW (window);
|
|
|
740 /* Motif and Athena scrollbars behave differently, but in accordance
|
|
|
741 with their standard behaviors. It is not possible to hide the
|
|
|
742 differences down in lwlib because knowledge of XEmacs buffer and
|
|
|
743 cursor motion routines is necessary. */
|
|
|
744 #if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
|
|
|
745 defined (LWLIB_SCROLLBARS_ATHENA3D) || defined(HAVE_MS_WINDOWS)
|
|
|
746 window_scroll (window, Qnil, -1, ERROR_ME_NOT);
|
|
|
747 #else /* Athena */
|
|
|
748 {
|
|
|
749 Bufpos bufpos;
|
|
|
750 Lisp_Object value = Fcdr (object);
|
|
|
751
|
|
|
752 CHECK_INT (value);
|
|
|
753 Fmove_to_window_line (Qzero, window);
|
|
|
754 /* can't use Fvertical_motion() because it moves the buffer point
|
|
|
755 rather than the window's point.
|
|
|
756
|
|
|
757 #### It does? Why does it take a window argument then? */
|
|
|
758 bufpos = vmotion (XWINDOW (window), XINT (Fwindow_point (window)),
|
|
|
759 XINT (value), 0);
|
|
|
760 Fset_window_point (window, make_int (bufpos));
|
|
|
761 Fcenter_to_window_line (Qzero, window);
|
|
|
762 }
|
|
|
763 #endif /* Athena */
|
|
|
764 zmacs_region_stays = 1;
|
|
|
765 return Qnil;
|
|
|
766 }
|
|
|
767
|
|
|
768 DEFUN ("scrollbar-page-down", Fscrollbar_page_down, 1, 1, 0, /*
|
|
|
769 Function called when the user gives the "page-down" scrollbar action.
|
|
|
770 \(The way this is done can vary from scrollbar to scrollbar.) One argument,
|
|
|
771 a cons containing the scrollbar's window and a value (#### document me!
|
|
|
772 This value is nil for Motif/Lucid scrollbars and a number for Athena
|
|
|
773 scrollbars). You can advise this function to change the scrollbar
|
|
|
774 behavior.
|
|
|
775 */
|
|
|
776 (object))
|
|
|
777 {
|
|
|
778 Lisp_Object window = Fcar (object);
|
|
|
779
|
|
|
780 CHECK_LIVE_WINDOW (window);
|
|
|
781 /* Motif and Athena scrollbars behave differently, but in accordance
|
|
|
782 with their standard behaviors. It is not possible to hide the
|
|
|
783 differences down in lwlib because knowledge of XEmacs buffer and
|
|
|
784 cursor motion routines is necessary. */
|
|
|
785 #if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
|
|
|
786 defined (LWLIB_SCROLLBARS_ATHENA3D) || defined (HAVE_MS_WINDOWS)
|
|
|
787 window_scroll (window, Qnil, 1, ERROR_ME_NOT);
|
|
|
788 #else /* Athena */
|
|
|
789 {
|
|
|
790 Lisp_Object value = Fcdr (object);
|
|
|
791 CHECK_INT (value);
|
|
|
792 Fmove_to_window_line (value, window);
|
|
|
793 Fcenter_to_window_line (Qzero, window);
|
|
|
794 }
|
|
|
795 #endif /* Athena */
|
|
|
796 zmacs_region_stays = 1;
|
|
|
797 return Qnil;
|
|
|
798 }
|
|
|
799
|
|
|
800 DEFUN ("scrollbar-to-top", Fscrollbar_to_top, 1, 1, 0, /*
|
|
|
801 Function called when the user invokes the "to-top" scrollbar action.
|
|
|
802 The way this is done can vary from scrollbar to scrollbar, but
|
|
|
803 C-button1 on the up-arrow is very common. One argument, the
|
|
|
804 scrollbar's window. You can advise this function to change the
|
|
|
805 scrollbar behavior.
|
|
|
806 */
|
|
|
807 (window))
|
|
|
808 {
|
|
|
809 Lisp_Object orig_pt = Fwindow_point (window);
|
|
|
810 Fset_window_point (window, Fpoint_min (Fwindow_buffer (window)));
|
|
|
811 Fcenter_to_window_line (Qzero, window);
|
|
|
812 scrollbar_reset_cursor (window, orig_pt);
|
|
|
813 zmacs_region_stays = 1;
|
|
|
814 return Qnil;
|
|
|
815 }
|
|
|
816
|
|
|
817 DEFUN ("scrollbar-to-bottom", Fscrollbar_to_bottom, 1, 1, 0, /*
|
|
|
818 Function called when the user invokes the "to-bottom" scrollbar action.
|
|
|
819 The way this is done can vary from scrollbar to scrollbar, but
|
|
|
820 C-button1 on the down-arrow is very common. One argument, the
|
|
|
821 scrollbar's window. You can advise this function to change the
|
|
|
822 scrollbar behavior.
|
|
|
823 */
|
|
|
824 (window))
|
|
|
825 {
|
|
|
826 Lisp_Object orig_pt = Fwindow_point (window);
|
|
|
827 Fset_window_point (window, Fpoint_max (Fwindow_buffer (window)));
|
|
|
828 Fcenter_to_window_line (make_int (-3), window);
|
|
|
829 scrollbar_reset_cursor (window, orig_pt);
|
|
|
830 zmacs_region_stays = 1;
|
|
|
831 return Qnil;
|
|
|
832 }
|
|
|
833
|
|
|
834 DEFUN ("scrollbar-vertical-drag", Fscrollbar_vertical_drag, 1, 1, 0, /*
|
|
|
835 Function called when the user drags the vertical scrollbar slider.
|
|
|
836 One argument, a cons containing the scrollbar's window and a value
|
|
|
837 between point-min and point-max. You can advise this function to
|
|
|
838 change the scrollbar behavior.
|
|
|
839 */
|
|
|
840 (object))
|
|
|
841 {
|
|
|
842 Bufpos start_pos;
|
|
|
843 Lisp_Object orig_pt;
|
|
|
844 Lisp_Object window = Fcar (object);
|
|
|
845 Lisp_Object value = Fcdr (object);
|
|
|
846
|
|
|
847 orig_pt = Fwindow_point (window);
|
|
|
848 Fset_marker (XWINDOW (window)->sb_point, value, Fwindow_buffer (window));
|
|
|
849 start_pos = scrollbar_point (XWINDOW (window), 1);
|
|
|
850 Fset_window_start (window, make_int (start_pos), Qnil);
|
|
|
851 scrollbar_reset_cursor (window, orig_pt);
|
|
|
852 Fsit_for(Qzero, Qnil);
|
|
|
853 zmacs_region_stays = 1;
|
|
|
854 return Qnil;
|
|
|
855 }
|
|
|
856
|
|
|
857 DEFUN ("scrollbar-set-hscroll", Fscrollbar_set_hscroll, 2, 2, 0, /*
|
|
|
858 Set WINDOW's hscroll position to VALUE.
|
|
|
859 This ensures that VALUE is in the proper range for the horizontal scrollbar.
|
|
|
860 */
|
|
|
861 (window, value))
|
|
|
862 {
|
|
|
863 struct window *w;
|
|
|
864 int hscroll, wcw, max_len;
|
|
|
865
|
|
|
866 CHECK_LIVE_WINDOW (window);
|
|
|
867 if (!EQ (value, Qmax))
|
|
|
868 CHECK_INT (value);
|
|
|
869
|
|
|
870 w = XWINDOW (window);
|
|
|
871 wcw = window_char_width (w, 0) - 1;
|
|
440
|
872 /* #### We should be able to scroll further right as long as there is
|
|
428
|
873 a visible truncation glyph. This calculation for max is bogus. */
|
|
|
874 max_len = w->max_line_len + 2;
|
|
|
875
|
|
|
876 if (EQ (value, Qmax) || (XINT (value) > (max_len - wcw)))
|
|
|
877 hscroll = max_len - wcw;
|
|
|
878 else
|
|
|
879 hscroll = XINT (value);
|
|
|
880
|
|
|
881 /* Can't allow this out of set-window-hscroll's acceptable range. */
|
|
|
882 /* #### What hell on the earth this code limits scroll size to the
|
|
|
883 machine-dependent SHORT size? -- kkm */
|
|
|
884 if (hscroll < 0)
|
|
|
885 hscroll = 0;
|
|
|
886 else if (hscroll >= (1 << (SHORTBITS - 1)) - 1)
|
|
|
887 hscroll = (1 << (SHORTBITS - 1)) - 1;
|
|
|
888
|
|
|
889 if (hscroll != w->hscroll)
|
|
|
890 Fset_window_hscroll (window, make_int (hscroll));
|
|
|
891
|
|
|
892 return Qnil;
|
|
|
893 }
|
|
|
894
|
|
|
895
|
|
|
896 /************************************************************************/
|
|
|
897 /* initialization */
|
|
|
898 /************************************************************************/
|
|
|
899
|
|
|
900 void
|
|
|
901 syms_of_scrollbar (void)
|
|
|
902 {
|
|
|
903 defsymbol (&Qscrollbar_line_up, "scrollbar-line-up");
|
|
|
904 defsymbol (&Qscrollbar_line_down, "scrollbar-line-down");
|
|
|
905 defsymbol (&Qscrollbar_page_up, "scrollbar-page-up");
|
|
|
906 defsymbol (&Qscrollbar_page_down, "scrollbar-page-down");
|
|
|
907 defsymbol (&Qscrollbar_to_top, "scrollbar-to-top");
|
|
|
908 defsymbol (&Qscrollbar_to_bottom, "scrollbar-to-bottom");
|
|
|
909 defsymbol (&Qscrollbar_vertical_drag, "scrollbar-vertical-drag");
|
|
|
910
|
|
|
911 defsymbol (&Qscrollbar_char_left, "scrollbar-char-left");
|
|
|
912 defsymbol (&Qscrollbar_char_right, "scrollbar-char-right");
|
|
|
913 defsymbol (&Qscrollbar_page_left, "scrollbar-page-left");
|
|
|
914 defsymbol (&Qscrollbar_page_right, "scrollbar-page-right");
|
|
|
915 defsymbol (&Qscrollbar_to_left, "scrollbar-to-left");
|
|
|
916 defsymbol (&Qscrollbar_to_right, "scrollbar-to-right");
|
|
|
917 defsymbol (&Qscrollbar_horizontal_drag, "scrollbar-horizontal-drag");
|
|
|
918
|
|
|
919 defsymbol (&Qinit_scrollbar_from_resources, "init-scrollbar-from-resources");
|
|
|
920
|
|
|
921 /* #### All these functions should be moved into Lisp.
|
|
|
922 See comment above. */
|
|
|
923 DEFSUBR (Fscrollbar_line_up);
|
|
|
924 DEFSUBR (Fscrollbar_line_down);
|
|
|
925 DEFSUBR (Fscrollbar_page_up);
|
|
|
926 DEFSUBR (Fscrollbar_page_down);
|
|
|
927 DEFSUBR (Fscrollbar_to_top);
|
|
|
928 DEFSUBR (Fscrollbar_to_bottom);
|
|
|
929 DEFSUBR (Fscrollbar_vertical_drag);
|
|
|
930
|
|
|
931 DEFSUBR (Fscrollbar_set_hscroll);
|
|
|
932 }
|
|
|
933
|
|
|
934 void
|
|
|
935 vars_of_scrollbar (void)
|
|
|
936 {
|
|
|
937 DEFVAR_LISP ("scrollbar-pointer-glyph", &Vscrollbar_pointer_glyph /*
|
|
|
938 *The shape of the mouse-pointer when over a scrollbar.
|
|
|
939 This is a glyph; use `set-glyph-image' to change it.
|
|
|
940 If unspecified in a particular domain, the window-system-provided
|
|
|
941 default pointer is used.
|
|
|
942 */ );
|
|
|
943
|
|
|
944 Fprovide (intern ("scrollbar"));
|
|
|
945 }
|
|
|
946
|
|
|
947 void
|
|
|
948 specifier_vars_of_scrollbar (void)
|
|
|
949 {
|
|
|
950 DEFVAR_SPECIFIER ("scrollbar-width", &Vscrollbar_width /*
|
|
|
951 *Width of vertical scrollbars.
|
|
|
952 This is a specifier; use `set-specifier' to change it.
|
|
|
953 */ );
|
|
|
954 Vscrollbar_width = make_magic_specifier (Qnatnum);
|
|
|
955 set_specifier_fallback
|
|
|
956 (Vscrollbar_width,
|
|
|
957 list1 (Fcons (Qnil, make_int (DEFAULT_SCROLLBAR_WIDTH))));
|
|
|
958 set_specifier_caching (Vscrollbar_width,
|
|
438
|
959 offsetof (struct window, scrollbar_width),
|
|
428
|
960 vertical_scrollbar_changed_in_window,
|
|
438
|
961 offsetof (struct frame, scrollbar_width),
|
|
428
|
962 frame_size_slipped);
|
|
|
963
|
|
|
964 DEFVAR_SPECIFIER ("scrollbar-height", &Vscrollbar_height /*
|
|
|
965 *Height of horizontal scrollbars.
|
|
|
966 This is a specifier; use `set-specifier' to change it.
|
|
|
967 */ );
|
|
|
968 Vscrollbar_height = make_magic_specifier (Qnatnum);
|
|
|
969 set_specifier_fallback
|
|
|
970 (Vscrollbar_height,
|
|
|
971 list1 (Fcons (Qnil, make_int (DEFAULT_SCROLLBAR_HEIGHT))));
|
|
|
972 set_specifier_caching (Vscrollbar_height,
|
|
438
|
973 offsetof (struct window, scrollbar_height),
|
|
428
|
974 some_window_value_changed,
|
|
438
|
975 offsetof (struct frame, scrollbar_height),
|
|
428
|
976 frame_size_slipped);
|
|
|
977
|
|
|
978 DEFVAR_SPECIFIER ("horizontal-scrollbar-visible-p", &Vhorizontal_scrollbar_visible_p /*
|
|
|
979 *Whether the horizontal scrollbar is visible.
|
|
|
980 This is a specifier; use `set-specifier' to change it.
|
|
|
981 */ );
|
|
|
982 Vhorizontal_scrollbar_visible_p = Fmake_specifier (Qboolean);
|
|
|
983 set_specifier_fallback (Vhorizontal_scrollbar_visible_p,
|
|
|
984 list1 (Fcons (Qnil, Qt)));
|
|
|
985 set_specifier_caching (Vhorizontal_scrollbar_visible_p,
|
|
438
|
986 offsetof (struct window,
|
|
|
987 horizontal_scrollbar_visible_p),
|
|
428
|
988 some_window_value_changed,
|
|
438
|
989 offsetof (struct frame,
|
|
|
990 horizontal_scrollbar_visible_p),
|
|
428
|
991 frame_size_slipped);
|
|
|
992
|
|
|
993 DEFVAR_SPECIFIER ("vertical-scrollbar-visible-p", &Vvertical_scrollbar_visible_p /*
|
|
|
994 *Whether the vertical scrollbar is visible.
|
|
|
995 This is a specifier; use `set-specifier' to change it.
|
|
|
996 */ );
|
|
|
997 Vvertical_scrollbar_visible_p = Fmake_specifier (Qboolean);
|
|
|
998 set_specifier_fallback (Vvertical_scrollbar_visible_p,
|
|
|
999 list1 (Fcons (Qnil, Qt)));
|
|
|
1000 set_specifier_caching (Vvertical_scrollbar_visible_p,
|
|
438
|
1001 offsetof (struct window,
|
|
|
1002 vertical_scrollbar_visible_p),
|
|
428
|
1003 vertical_scrollbar_changed_in_window,
|
|
438
|
1004 offsetof (struct frame,
|
|
|
1005 vertical_scrollbar_visible_p),
|
|
428
|
1006 frame_size_slipped);
|
|
|
1007
|
|
|
1008 DEFVAR_SPECIFIER ("scrollbar-on-left-p", &Vscrollbar_on_left_p /*
|
|
|
1009 *Whether the vertical scrollbar is on the left side of window or frame.
|
|
|
1010 This is a specifier; use `set-specifier' to change it.
|
|
|
1011 */ );
|
|
|
1012 Vscrollbar_on_left_p = Fmake_specifier (Qboolean);
|
|
|
1013
|
|
|
1014 {
|
|
|
1015 /* Kludge. Under X, we want athena scrollbars on the left,
|
|
|
1016 while all other scrollbars go on the right by default. */
|
|
|
1017 Lisp_Object fallback = list1 (Fcons (Qnil, Qnil));
|
|
|
1018 #if defined (HAVE_X_WINDOWS) \
|
|
|
1019 && !defined (LWLIB_SCROLLBARS_MOTIF) \
|
|
|
1020 && !defined (LWLIB_SCROLLBARS_LUCID) \
|
|
|
1021 && !defined (LWLIB_SCROLLBARS_ATHENA3D)
|
|
|
1022
|
|
|
1023 fallback = Fcons (Fcons (list1 (Qx), Qt), fallback);
|
|
|
1024 #endif
|
|
|
1025 set_specifier_fallback (Vscrollbar_on_left_p, fallback);
|
|
|
1026 }
|
|
|
1027
|
|
|
1028 set_specifier_caching (Vscrollbar_on_left_p,
|
|
438
|
1029 offsetof (struct window, scrollbar_on_left_p),
|
|
428
|
1030 vertical_scrollbar_changed_in_window,
|
|
438
|
1031 offsetof (struct frame, scrollbar_on_left_p),
|
|
428
|
1032 frame_size_slipped);
|
|
|
1033
|
|
|
1034 DEFVAR_SPECIFIER ("scrollbar-on-top-p", &Vscrollbar_on_top_p /*
|
|
|
1035 *Whether the horizontal scrollbar is on the top side of window or frame.
|
|
|
1036 This is a specifier; use `set-specifier' to change it.
|
|
|
1037 */ );
|
|
|
1038 Vscrollbar_on_top_p = Fmake_specifier (Qboolean);
|
|
|
1039 set_specifier_fallback (Vscrollbar_on_top_p,
|
|
|
1040 list1 (Fcons (Qnil, Qnil)));
|
|
|
1041 set_specifier_caching (Vscrollbar_on_top_p,
|
|
438
|
1042 offsetof (struct window, scrollbar_on_top_p),
|
|
428
|
1043 some_window_value_changed,
|
|
438
|
1044 offsetof (struct frame, scrollbar_on_top_p),
|
|
428
|
1045 frame_size_slipped);
|
|
|
1046 }
|
|
|
1047
|
|
|
1048 void
|
|
|
1049 complex_vars_of_scrollbar (void)
|
|
|
1050 {
|
|
|
1051 Vscrollbar_pointer_glyph = Fmake_glyph_internal (Qpointer);
|
|
|
1052
|
|
|
1053 set_specifier_caching (XGLYPH (Vscrollbar_pointer_glyph)->image,
|
|
438
|
1054 offsetof (struct window, scrollbar_pointer),
|
|
428
|
1055 scrollbar_pointer_changed_in_window,
|
|
|
1056 0, 0);
|
|
|
1057 }
|
