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428
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1 /* Implements elisp-programmable dialog boxes -- MS Windows interface.
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2 Copyright (C) 1998 Kirill M. Katsnelson <kkm@kis.ru>
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* Author:
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24 Initially written by kkm, May 1998
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25 */
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26
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27 #include <config.h>
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28 #include "lisp.h"
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29
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30 #include "buffer.h"
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31 #include "console-msw.h"
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32 #include "frame.h"
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33 #include "gui.h"
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34 #include "opaque.h"
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35
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36 /* List containing all dialog data structures of currently popped up
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37 dialogs. Each item is a cons of frame object and a vector of
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38 callbacks for buttons in the dialog, in order */
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39 static Lisp_Object Vdialog_data_list;
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40
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41 /* DLUs per character metrics */
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42 #define X_DLU_PER_CHAR 4
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43 #define Y_DLU_PER_CHAR 8
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44
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45 /*
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46 Button metrics
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47 --------------
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48 All buttons have height of 15 DLU. The minimum width for a button is 32 DLU,
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49 but it can be expanded to accommodate its text, so the width is calculated as
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50 8 DLU per button plus 4 DLU per character.
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51 max (32, 6 * text_length). The factor of six is rather empirical, but it
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52 works better than 8 which comes from the definition of a DLU. Buttons are
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53 spaced with 6 DLU gap. Minimum distance from the button to the left or right
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54 dialog edges is 6 DLU, and the distance between the dialog bottom edge and
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55 buttons is 7 DLU.
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56 */
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57
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58 #define X_MIN_BUTTON 32
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59 #define X_BUTTON_MARGIN 8
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60 #define Y_BUTTON 15
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61 #define X_BUTTON_SPACING 6
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62 #define X_BUTTON_FROM_EDGE 6
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63 #define Y_BUTTON_FROM_EDGE 7
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64
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65 /*
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66 Text field metrics
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67 ------------------
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68 Text distance from left and right edges is the same as for buttons, and the
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69 top margin is 11 DLU. The static control has height of 2 DLU per control
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70 plus 8 DLU per each line of text. Distance between the bottom edge of the
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71 control and the button row is 15 DLU. Minimum width of the static control
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72 is 100 DLU, thus giving minimum dialog weight of 112 DLU. Maximum width is
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73 300 DLU, and, if the text is wider than that, the text is wrapped on the
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74 next line. Each character in the text is considered 4 DLU wide.
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75 */
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76
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77 #define X_MIN_TEXT 100
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78 #define X_AVE_TEXT 200
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79 #define X_MAX_TEXT 300
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80 #define X_TEXT_FROM_EDGE X_BUTTON_FROM_EDGE
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81 #define Y_TEXT_FROM_EDGE 11
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82 #define Y_TEXT_MARGIN 2
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83 #define Y_TEXT_FROM_BUTTON 15
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84
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85 #define X_MIN_TEXT_CHAR (X_MIN_TEXT / X_DLU_PER_CHAR)
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86 #define X_AVE_TEXT_CHAR (X_AVE_TEXT / X_DLU_PER_CHAR)
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87 #define X_MAX_TEXT_CHAR (X_MAX_TEXT / X_DLU_PER_CHAR)
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88
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89 /*
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90 Layout algorithm
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91 ----------------
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92 First we calculate the minimum width of the button row, excluding "from
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93 edge" distances. Note that the static control text can be narrower than
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94 X_AVE_TEXT only if both text and button row are narrower than that (so,
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95 even if text *can* be wrapped into 2 rows narrower than ave width, it is not
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96 done). Let WBR denote the width of the button row.
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97
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98 Next, the width of the static field is determined.
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99 First, if all lines of text fit into max (WBR, X_MAX_TEXT), the width of the
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100 control is the same as the width of the longest line.
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101 Second, if all lines of text are narrower than X_MIN_TEXT, then width of
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102 the control is set to X_MIN_TEXT.
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103 Otherwise, width is set to max(WBR, X_AVE_TEXT). In this case, line wrapping will
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104 happen.
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105
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106 If width of the text control is larger than that of the button row, then the
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107 latter is centered across the dialog, by giving it extra edge
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108 margins. Otherwise, minimal margins are given to the button row.
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109 */
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110
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111 #define ID_ITEM_BIAS 32
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112
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113 /* Dialog procedure */
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114 static BOOL CALLBACK
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115 dialog_proc (HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param)
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116 {
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117 switch (msg)
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118 {
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119 case WM_INITDIALOG:
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120 SetWindowLong (hwnd, DWL_USER, l_param);
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121 break;
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122
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123 case WM_DESTROY:
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124 {
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125 Lisp_Object data;
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126 VOID_TO_LISP (data, GetWindowLong (hwnd, DWL_USER));
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127 Vdialog_data_list = delq_no_quit (data, Vdialog_data_list);
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128 }
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129 break;
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130
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131 case WM_COMMAND:
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132 {
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133 Lisp_Object fn, arg, data;
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134 VOID_TO_LISP (data, GetWindowLong (hwnd, DWL_USER));
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135
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136 assert (w_param >= ID_ITEM_BIAS
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137 && w_param < XVECTOR_LENGTH (XCDR (data)) + ID_ITEM_BIAS);
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138
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139 get_gui_callback (XVECTOR_DATA (XCDR (data)) [w_param - ID_ITEM_BIAS],
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140 &fn, &arg);
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141 mswindows_enqueue_misc_user_event (XCAR (data), fn, arg);
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142
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143 DestroyWindow (hwnd);
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144 }
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145 break;
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146
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147 default:
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148 return FALSE;
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149 }
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150 return TRUE;
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151 }
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152
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153 /* Helper function which converts the supplied string STRING into Unicode and
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154 pushes it at the end of DYNARR */
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155 static void
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156 push_lisp_string_as_unicode (unsigned_char_dynarr* dynarr, Lisp_Object string)
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157 {
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158 Extbyte *mbcs_string;
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159 Charcount length = XSTRING_CHAR_LENGTH (string);
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160 LPWSTR uni_string;
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161
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162 GET_C_CHARPTR_EXT_DATA_ALLOCA (XSTRING_DATA (string),
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163 FORMAT_OS, mbcs_string);
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164 uni_string = alloca_array (WCHAR, length + 1);
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165 length = MultiByteToWideChar (CP_ACP, 0, mbcs_string, -1,
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166 uni_string, sizeof(WCHAR) * (length + 1));
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167 Dynarr_add_many (dynarr, uni_string, sizeof(WCHAR) * length);
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168 }
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169
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170 /* Given button TEXT, return button width in DLU */
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171 static unsigned int
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172 button_width (Lisp_Object text)
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173 {
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174 unsigned int width = X_DLU_PER_CHAR * XSTRING_CHAR_LENGTH (text);
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175 return max (X_MIN_BUTTON, width);
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176 }
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177
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178 /* Unwind protection routine frees a dynarr opaqued into arg */
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179 static Lisp_Object
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180 free_dynarr_opaque_ptr (Lisp_Object arg)
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181 {
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182 Dynarr_free (get_opaque_ptr (arg));
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183 return arg;
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184 }
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185
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186
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187 #define ALIGN_TEMPLATE \
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188 { \
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189 unsigned int slippage = Dynarr_length (template) & 3; \
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190 if (slippage) \
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191 Dynarr_add_many (template, &zeroes, slippage); \
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192 }
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193
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194 static void
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195 mswindows_popup_dialog_box (struct frame* f, Lisp_Object desc)
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196 {
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197 Lisp_Object_dynarr *dialog_items = Dynarr_new (Lisp_Object);
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198 unsigned_char_dynarr *template = Dynarr_new (unsigned_char);
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199 unsigned int button_row_width = 0;
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200 unsigned int text_width, text_height;
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201
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202 int unbind_count = specpdl_depth ();
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203 record_unwind_protect (free_dynarr_opaque_ptr,
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204 make_opaque_ptr (dialog_items));
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205 record_unwind_protect (free_dynarr_opaque_ptr,
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206 make_opaque_ptr (template));
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207
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208 /* A big NO NEED to GCPRO gui_items stored in the array: they are just
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209 pointers into DESC list, which is GC-protected by the caller */
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210
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211 /* Parse each item in the dialog into gui_item structs, and stuff a dynarr
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212 of these. Calculate button row width in this loop too */
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213 {
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214 Lisp_Object item_cons;
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215
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216 EXTERNAL_LIST_LOOP (item_cons, XCDR (desc))
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217 {
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218 if (!NILP (XCAR (item_cons)))
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219 {
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220 Lisp_Object gitem = gui_parse_item_keywords (XCAR (item_cons));
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221 Dynarr_add (dialog_items, gitem);
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222 button_row_width += button_width (XGUI_ITEM (gitem)->name)
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223 + X_BUTTON_MARGIN;
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224 }
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225 }
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226 if (Dynarr_length (dialog_items) == 0)
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227 signal_simple_error ("Dialog descriptor provides no active items", desc);
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228 button_row_width -= X_BUTTON_MARGIN;
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229 }
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230
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231 /* Determine the final width layout */
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232 {
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233 Bufbyte *p = XSTRING_DATA (XCAR (desc));
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234 Charcount string_max = 0, this_length = 0;
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235 while (1)
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236 {
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237 Emchar ch = charptr_emchar (p);
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238 INC_CHARPTR (p);
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239
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240 if (ch == (Emchar)'\n' || ch == (Emchar)'\0')
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241 {
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242 string_max = max (this_length, string_max);
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243 this_length = 0;
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244 }
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245 else
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246 ++this_length;
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247
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248 if (ch == (Emchar)'\0')
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249 break;
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250 }
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251
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252 if (string_max * X_DLU_PER_CHAR > max (X_MAX_TEXT, button_row_width))
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253 text_width = X_AVE_TEXT;
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254 else if (string_max * X_DLU_PER_CHAR < X_MIN_TEXT)
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255 text_width = X_MIN_TEXT;
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256 else
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257 text_width = string_max * X_DLU_PER_CHAR;
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258 text_width = max (text_width, button_row_width);
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259 }
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260
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261 /* Now calculate the height for the text control */
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262 {
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263 Bufbyte *p = XSTRING_DATA (XCAR (desc));
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264 Charcount break_at = text_width / X_DLU_PER_CHAR;
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265 Charcount char_pos = 0;
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266 int num_lines = 1;
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267 Emchar ch;
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268
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269 while ((ch = charptr_emchar (p)) != (Emchar)'\0')
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270 {
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271 INC_CHARPTR (p);
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272 char_pos += ch != (Emchar)'\n';
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273 if (ch == (Emchar)'\n' || char_pos == break_at)
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274 {
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275 ++num_lines;
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276 char_pos = 0;
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277 }
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278 }
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279 text_height = Y_TEXT_MARGIN + Y_DLU_PER_CHAR * num_lines;
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280 }
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281
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282 /* Ok, now we are ready to stuff the dialog template and lay out controls */
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283 {
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284 DLGTEMPLATE dlg_tem;
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285 DLGITEMTEMPLATE item_tem;
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286 int i;
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287 const unsigned int zeroes = 0;
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288 const unsigned int ones = 0xFFFFFFFF;
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289 const WORD static_class_id = 0x0082;
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290 const WORD button_class_id = 0x0080;
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291
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292 /* Create and stuff in DLGTEMPLATE header */
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293 dlg_tem.style = (DS_CENTER | DS_MODALFRAME | DS_SETFONT
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294 | WS_CAPTION | WS_POPUP | WS_VISIBLE);
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295 dlg_tem.dwExtendedStyle = 0;
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296 dlg_tem.cdit = Dynarr_length (dialog_items) + 1;
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297 dlg_tem.x = 0;
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298 dlg_tem.y = 0;
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299 dlg_tem.cx = text_width + 2 * X_TEXT_FROM_EDGE;
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300 dlg_tem.cy = (Y_TEXT_FROM_EDGE + text_height + Y_TEXT_FROM_BUTTON
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301 + Y_BUTTON + Y_BUTTON_FROM_EDGE);
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302 Dynarr_add_many (template, &dlg_tem, sizeof (dlg_tem));
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303
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304 /* We want no menu and standard class */
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305 Dynarr_add_many (template, &zeroes, 4);
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306
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307 /* And the third is the dialog title. "XEmacs" as long as we do not supply
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308 one in descriptor. Note that the string must be in Unicode. */
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309 Dynarr_add_many (template, L"XEmacs", 14);
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310
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311 /* We want standard dialog font */
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312 Dynarr_add_many (template, L"\x08MS Shell Dlg", 28);
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313
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314 /* Next add text control. */
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315 item_tem.style = WS_CHILD | WS_VISIBLE | SS_LEFT | SS_NOPREFIX;
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316 item_tem.dwExtendedStyle = 0;
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317 item_tem.x = X_TEXT_FROM_EDGE;
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318 item_tem.y = Y_TEXT_FROM_EDGE;
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319 item_tem.cx = text_width;
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320 item_tem.cy = text_height;
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321 item_tem.id = 0xFFFF;
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322
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323 ALIGN_TEMPLATE;
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324 Dynarr_add_many (template, &item_tem, sizeof (item_tem));
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325
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326 /* Right after class id follows */
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327 Dynarr_add_many (template, &ones, 2);
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328 Dynarr_add_many (template, &static_class_id, sizeof (static_class_id));
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329
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330 /* Next thing to add is control text, as Unicode string */
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331 push_lisp_string_as_unicode (template, XCAR (desc));
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332
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333 /* Specify 0 length creation data */
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334 Dynarr_add_many (template, &zeroes, 2);
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335
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336 /* Now it's the button time */
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337 item_tem.y = Y_TEXT_FROM_EDGE + text_height + Y_TEXT_FROM_BUTTON;
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338 item_tem.x = X_BUTTON_FROM_EDGE + (button_row_width < text_width
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339 ? (text_width - button_row_width) / 2
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340 : 0);
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341 item_tem.cy = Y_BUTTON;
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342 item_tem.dwExtendedStyle = 0;
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343
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344 for (i = 0; i < Dynarr_length (dialog_items); ++i)
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345 {
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346 Lisp_Object* gui_item = Dynarr_atp (dialog_items, i);
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347 struct Lisp_Gui_Item *pgui_item = XGUI_ITEM (*gui_item);
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348
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349 item_tem.style = (WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON
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350 | (gui_item_active_p (*gui_item) ? 0 : WS_DISABLED));
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351 item_tem.cx = button_width (pgui_item->name);
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352 /* Item ids are indices into dialog_items plus offset, to avoid having
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353 items by reserved ids (IDOK, IDCANCEL) */
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354 item_tem.id = i + ID_ITEM_BIAS;
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355
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356 ALIGN_TEMPLATE;
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357 Dynarr_add_many (template, &item_tem, sizeof (item_tem));
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358
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359 /* Right after 0xFFFF and class id atom follows */
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360 Dynarr_add_many (template, &ones, 2);
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361 Dynarr_add_many (template, &button_class_id, sizeof (button_class_id));
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362
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363 /* Next thing to add is control text, as Unicode string */
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364 push_lisp_string_as_unicode (template, pgui_item->name);
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365
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366 /* Specify 0 length creation data. */
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367 Dynarr_add_many (template, &zeroes, 2);
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368
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369 item_tem.x += item_tem.cx + X_BUTTON_SPACING;
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370 }
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371 }
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372
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373 /* Now the Windows dialog structure is ready. We need to prepare a
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374 data structure for the new dialog, which will contain callbacks
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375 and the frame for these callbacks. This structure has to be
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376 GC-protected. The data structure itself is a cons of frame object
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377 and a vector of callbacks; for the protection reasons it is put
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378 into a statically protected list. */
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379 {
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380 Lisp_Object frame, vector, dialog_data;
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381 int i;
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382
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383 XSETFRAME (frame, f);
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384 vector = make_vector (Dynarr_length (dialog_items), Qunbound);
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385 dialog_data = Fcons (frame, vector);
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386 for (i = 0; i < Dynarr_length (dialog_items); i++)
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387 XVECTOR_DATA (vector) [i] = XGUI_ITEM (*Dynarr_atp (dialog_items, i))->callback;
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388
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389 /* Woof! Everything is ready. Pop pop pop in now! */
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390 if (!CreateDialogIndirectParam (NULL,
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391 (LPDLGTEMPLATE) Dynarr_atp (template, 0),
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392 FRAME_MSWINDOWS_HANDLE (f), dialog_proc,
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393 (LPARAM) LISP_TO_VOID (dialog_data)))
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394 /* Something went wrong creating the dialog */
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395 signal_simple_error ("System error creating dialog", desc);
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396
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397 Vdialog_data_list = Fcons (dialog_data, Vdialog_data_list);
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398 }
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399
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400 /* Cease protection and free dynarrays */
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401 unbind_to (unbind_count, Qnil);
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402 }
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403
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404 void
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405 console_type_create_dialog_mswindows (void)
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406 {
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407 CONSOLE_HAS_METHOD (mswindows, popup_dialog_box);
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408 }
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409
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410 void
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411 vars_of_dialog_mswindows (void)
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412 {
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413 Vdialog_data_list = Qnil;
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414 staticpro (&Vdialog_data_list);
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415 }
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