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428
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1 /* Balloon Help
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2 Copyright (c) 1997 Douglas Keller
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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 /*
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24 * Balloon Help
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25 *
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26 * Version: 1.337 (Sun Apr 13 04:52:10 1997)
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27 *
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28 * Written by Douglas Keller <dkeller@vnet.ibm.com>
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29 *
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30 *
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31 */
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32
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33 #include <config.h>
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34 #include <string.h>
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35 #include <stdlib.h>
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36 #include <stdio.h>
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37 #include <assert.h>
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38
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39 #include <X11/Xlib.h>
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40 #include <X11/Xutil.h>
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41 #include <X11/extensions/shape.h>
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42
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43 #include "xintrinsic.h"
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44
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45 #include "balloon_help.h"
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46
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442
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47 #ifndef max
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428
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48 #define max(x,y) (x>y?x:y)
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49 #endif
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50
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51 #undef bool
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52 #define bool int
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53
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54 #define MARGIN_WIDTH 4
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55 #define POINTER_OFFSET 8
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56 #define BORDER_WIDTH 2
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57 #define BORDER_WIDTH_HALF 1
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58
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59 #define CONE_HEIGHT 20
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60 #define CONE_WIDTH 50
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61
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62 #define SHAPE_CONE_TOP (1<<0)
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63 #define SHAPE_CONE_LEFT (1<<1)
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64 #define SHAPE_CONE_TOP_LEFT (SHAPE_CONE_TOP | SHAPE_CONE_LEFT)
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65 #define SHAPE_CONE_TOP_RIGHT (SHAPE_CONE_TOP)
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66 #define SHAPE_CONE_BOTTOM_LEFT (SHAPE_CONE_LEFT)
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67 #define SHAPE_CONE_BOTTOM_RIGHT (0)
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68 #define SHAPE_CONE_FREE (-1)
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69
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70
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71 static Display* b_dpy;
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72
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73 static XFontStruct* b_fontStruct;
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74 static GC b_gc;
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75
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76 static GC b_shineGC;
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77 static GC b_shadowGC;
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78
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79 static Window b_win;
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80 static bool b_winMapped;
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81
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82 static Pixmap b_mask;
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83 static int b_maskWidth, b_maskHeight;
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84 static GC b_maskGC;
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85
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442
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86 static const char* b_text;
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428
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87 static int b_width, b_height;
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88
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89 static XtIntervalId b_timer;
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90 static unsigned long b_delay;
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91
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92 static int b_screenWidth, b_screenHeight;
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93
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94 static int b_lastShape;
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95
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96 /*============================================================================
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97
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98 ============================================================================*/
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99
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100 static GC
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101 create_gc (Display* dpy, Window win, unsigned long fg, unsigned long bg,
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102 XFontStruct* fontStruct)
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103 {
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104 XGCValues gcv;
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105 unsigned long mask;
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106
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107 gcv.foreground = fg;
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108 gcv.background = bg;
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109 gcv.font = fontStruct->fid;
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110 gcv.join_style = JoinMiter;
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111 gcv.line_width = BORDER_WIDTH;
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112
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113 mask = GCFont | GCBackground | GCForeground | GCJoinStyle | GCLineWidth;
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114
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115 return XCreateGC (dpy, win, mask, &gcv);
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116 }
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117
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118 static void
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119 destroy_gc (Display* dpy, GC gc)
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120 {
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121 if (gc)
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122 {
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123 XFreeGC (dpy, gc);
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124 }
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125 }
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126
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127 /*============================================================================
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128
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129 ============================================================================*/
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130
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131 static Window
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132 create_window (Display* dpy, unsigned long bg)
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133 {
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134 Window win;
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135 XSetWindowAttributes attr;
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136 unsigned long attr_mask;
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137
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138 attr_mask = CWOverrideRedirect | CWBackPixel | CWSaveUnder;
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139 attr.override_redirect = True;
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140 attr.background_pixel = bg;
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141 attr.save_under = True;
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142
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143 win =
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144 XCreateWindow (dpy,
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145 DefaultRootWindow (dpy),
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146 0, 0, 1, 1,
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147 0,
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148 CopyFromParent, InputOutput, CopyFromParent,
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149 attr_mask, &attr);
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150
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151 XSelectInput (dpy, win,
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152 SubstructureRedirectMask |
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153 SubstructureNotifyMask |
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154 ExposureMask |
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155 EnterWindowMask |
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156 LeaveWindowMask);
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157 return win;
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158 }
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159
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160 static void
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161 destroy_window (Display* dpy, Window win)
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162 {
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163 if (win)
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164 {
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165 XDestroyWindow (dpy, win);
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166 }
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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 ============================================================================*/
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172
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173 static void
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174 get_pointer_xy (Display* dpy, int* x_return, int* y_return)
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175 {
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176 int dummy;
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177 unsigned int mask;
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178 Window dummy_win;
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179
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180 XQueryPointer (dpy, RootWindow(dpy, DefaultScreen(dpy)), &dummy_win, &dummy_win,
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181 x_return, y_return, &dummy, &dummy, &mask);
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182 }
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183
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184 /*============================================================================
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185
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186 ============================================================================*/
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187
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188 static void
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189 create_pixmap_mask (int width, int height)
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190 {
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191 b_maskWidth = width;
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192 b_maskHeight = height;
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193 b_mask = XCreatePixmap (b_dpy, b_win, width, height, 1);
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194 }
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195
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196 static void
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197 destroy_pixmap_mask(void)
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198 {
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199 XFreePixmap (b_dpy, b_mask);
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200 }
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201
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202 static void
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203 grow_pixmap_mask (int width, int height)
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204 {
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205 if (width > b_maskWidth || height > b_maskHeight)
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206 {
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207 destroy_pixmap_mask ();
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208 create_pixmap_mask (width, height);
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209 }
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210 }
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211
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212 /*============================================================================
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213
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214 ============================================================================*/
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215
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216 static void
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442
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217 text_extent (XFontStruct* fontStruct, const char* text, int len,
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428
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218 int* width, int* height)
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219 {
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220 XCharStruct extent;
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221 int dummy;
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222
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223 XTextExtents (fontStruct, text, len, &dummy, &dummy, &dummy, &extent);
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224
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225 *width = extent.width;
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226 *height = fontStruct->ascent + fontStruct->descent;
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227 }
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228
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229 static void
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442
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230 get_text_size (Display* dpy, XFontStruct* fontStruct, const char* text,
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428
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231 int* max_width, int* max_height)
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232 {
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233 int width;
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234 int height;
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442
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235 const char* start;
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236 const char* end;
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428
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237
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238 *max_width = *max_height = 0;
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239
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240 start = text;
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241 while ((end = strchr(start, '\n')))
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242 {
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243 text_extent (fontStruct, start, end - start, &width, &height);
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244 *max_width = max (width, *max_width);
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245 *max_height += height;
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246
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247 start = end + 1;
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248 }
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249 text_extent (fontStruct, start, strlen (start), &width, &height);
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250 *max_width = max (width, *max_width);
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251 *max_height += height;
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252
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253 /* Min width */
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254 *max_width = max (*max_width, CONE_WIDTH / 2 * 3);
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255
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256 }
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257
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258 static void
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259 draw_text (Display* dpy, Window win, GC gc, XFontStruct* fontStruct,
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442
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260 int x, int y, const char* text)
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428
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261 {
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442
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262 const char* start;
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263 const char* end;
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428
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264 int font_height;
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265
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266 y += fontStruct->ascent;
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267
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268 font_height = fontStruct->ascent + fontStruct->descent;
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269
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270 start = text;
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271 while ((end = strchr(start, '\n')))
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272 {
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273 XDrawString (dpy, win, gc, x, y, start, end - start);
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274
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275 start = end + 1;
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276 y += font_height;
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277 }
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278 XDrawString (dpy, win, gc, x, y, start, strlen (start));
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279 }
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280
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281 /*============================================================================
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282
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283 ============================================================================*/
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284
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285 static int
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286 get_shape (int last_shape, int x, int y, int width, int height,
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287 int screen_width, int screen_height)
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288 {
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289 /* Can we use last_shape? */
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290 if (((last_shape == SHAPE_CONE_TOP_LEFT) &&
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291 (x + width < screen_width) && (y + height < screen_height)) ||
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292 ((last_shape == SHAPE_CONE_TOP_RIGHT) &&
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293 (x - width > 0) && (y + height < screen_height)) ||
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294 ((last_shape == SHAPE_CONE_BOTTOM_LEFT) &&
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295 (x + width < screen_width) && (y - height > 0)) ||
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296 ((last_shape == SHAPE_CONE_BOTTOM_RIGHT) &&
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297 (x - width > 0) && (y - height > 0)))
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298 return last_shape;
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299
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300 /* Try to pick a shape that will not get changed,
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301 e.g. if top left quadrant, top_left */
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302 return (x < screen_width / 2) ?
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303 (y < screen_height / 2 ? SHAPE_CONE_TOP_LEFT: SHAPE_CONE_BOTTOM_LEFT) :
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304 (y < screen_height / 2 ? SHAPE_CONE_TOP_RIGHT: SHAPE_CONE_BOTTOM_RIGHT);
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305 }
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306
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307 static void
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308 make_mask (int shape, int x, int y, int width, int height)
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309 {
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310 XPoint cone[ 3 ];
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311
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312 grow_pixmap_mask (width, height);
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313
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314 /* Clear mask */
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315 XSetForeground (b_dpy, b_maskGC, 0);
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316 XFillRectangle (b_dpy, b_mask, b_maskGC,
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317 0, 0, width, height);
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318
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319 /* Enable text area */
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320 XSetForeground (b_dpy, b_maskGC, 1);
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321 XFillRectangle (b_dpy, b_mask, b_maskGC, 0,
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322 shape & SHAPE_CONE_TOP ? CONE_HEIGHT : 0, width, height - CONE_HEIGHT);
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323
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324 /* Enable for cone area */
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325 cone[0].x = (shape & SHAPE_CONE_LEFT) ? CONE_WIDTH / 2 : width - (CONE_WIDTH / 2);
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326 cone[0].y = (shape & SHAPE_CONE_TOP) ? CONE_HEIGHT : height - CONE_HEIGHT;
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327 cone[1].x = (shape & SHAPE_CONE_LEFT) ? 0 : width;
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328 cone[1].y = (shape & SHAPE_CONE_TOP) ? 0 : height;
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329 cone[2].x = (shape & SHAPE_CONE_LEFT) ? CONE_WIDTH : width - CONE_WIDTH;
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330 cone[2].y = (shape & SHAPE_CONE_TOP) ? CONE_HEIGHT : height - CONE_HEIGHT;
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331
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332 XFillPolygon (b_dpy, b_mask, b_maskGC, cone, 3, Nonconvex, CoordModeOrigin);
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333
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334 }
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335
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336 static void
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337 show_help (XtPointer data, XtIntervalId* id)
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338 {
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339 int x, y;
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340 int shape;
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341 XPoint border[ 3 ];
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342
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343 if (id == NULL || ((id && b_timer) && b_text))
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344 {
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345 b_timer = None;
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346
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347 /* size */
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348 get_text_size (b_dpy, b_fontStruct, b_text, &b_width, &b_height);
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349 b_width += 2 * MARGIN_WIDTH + 2 * BORDER_WIDTH;
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350 b_height += 2 * MARGIN_WIDTH + 2 * BORDER_WIDTH + CONE_HEIGHT;
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351
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352 /* origin */
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353 get_pointer_xy (b_dpy, &x, &y);
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354
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355 /* guess at shape */
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356 shape = get_shape(b_lastShape, x, y, b_width, b_height,
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357 b_screenWidth, b_screenHeight);
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358
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359 x += (shape & SHAPE_CONE_LEFT) ? POINTER_OFFSET : -POINTER_OFFSET;
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360 y += (shape & SHAPE_CONE_TOP) ? POINTER_OFFSET : -POINTER_OFFSET;
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361
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362 /* make sure it is still ok with offset */
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363 shape = get_shape (shape, x, y, b_width, b_height, b_screenWidth, b_screenHeight);
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364
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365 b_lastShape = shape;
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366
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367 make_mask (shape, x, y, b_width, b_height);
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368
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369 XShapeCombineMask (b_dpy, b_win, ShapeBounding, 0, 0, b_mask, ShapeSet);
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370
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371 XMoveResizeWindow(b_dpy, b_win,
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372 (shape & SHAPE_CONE_LEFT) ? x : x - b_width,
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373 (shape & SHAPE_CONE_TOP) ? y : y - b_height,
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374 b_width, b_height);
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375
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376 XClearWindow (b_dpy, b_win);
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377
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378 XMapRaised (b_dpy, b_win);
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379 b_winMapped = True;
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380
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381 draw_text (b_dpy, b_win, b_gc, b_fontStruct,
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382 BORDER_WIDTH + MARGIN_WIDTH,
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383 BORDER_WIDTH + MARGIN_WIDTH + ((shape & SHAPE_CONE_TOP) ? CONE_HEIGHT : 0),
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384 b_text);
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385
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386 /* 3d border */
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387 /* shine- top left */
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388 border[0].x = 0 + BORDER_WIDTH_HALF;
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389 border[0].y = ((shape & SHAPE_CONE_TOP) ? b_height : b_height - CONE_HEIGHT) - BORDER_WIDTH_HALF;
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390 border[1].x = 0 + BORDER_WIDTH_HALF;
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391 border[1].y = ((shape & SHAPE_CONE_TOP) ? CONE_HEIGHT : 0) + BORDER_WIDTH_HALF;
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392 border[2].x = b_width - BORDER_WIDTH_HALF;
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393 border[2].y = border[1].y;
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394 XDrawLines (b_dpy, b_win, b_shineGC, border, 3, CoordModeOrigin);
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395
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396 /* shadow- bottom right */
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397 border[0].x = 0 + BORDER_WIDTH_HALF;
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398 border[0].y = ((shape & SHAPE_CONE_TOP) ? b_height : b_height - CONE_HEIGHT) - BORDER_WIDTH_HALF;
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399 border[1].x = b_width - BORDER_WIDTH_HALF;
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400 border[1].y = border[0].y;
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401 border[2].x = b_width - BORDER_WIDTH_HALF;
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402 border[2].y = ((shape & SHAPE_CONE_TOP) ? CONE_HEIGHT : 0) + BORDER_WIDTH_HALF;
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403 XDrawLines (b_dpy, b_win, b_shadowGC, border, 3, CoordModeOrigin);
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404
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405 /* cone */
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406 if (SHAPE_CONE_TOP_LEFT == shape)
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407 {
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408 XClearArea (b_dpy, b_win,
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409 CONE_WIDTH / 2 + BORDER_WIDTH,
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410 CONE_HEIGHT,
|
|
|
411 CONE_WIDTH / 2 - BORDER_WIDTH,
|
|
|
412 BORDER_WIDTH, False);
|
|
|
413 XDrawLine (b_dpy, b_win, b_shadowGC,
|
|
|
414 0,
|
|
|
415 0,
|
|
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416 CONE_WIDTH / 2 + BORDER_WIDTH_HALF,
|
|
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417 CONE_HEIGHT);
|
|
|
418 XDrawLine (b_dpy, b_win, b_shineGC,
|
|
|
419 0,
|
|
|
420 0,
|
|
|
421 CONE_WIDTH - BORDER_WIDTH_HALF,
|
|
|
422 CONE_HEIGHT);
|
|
|
423 }
|
|
|
424 else if (SHAPE_CONE_TOP_RIGHT == shape)
|
|
|
425 {
|
|
|
426 XClearArea (b_dpy, b_win,
|
|
|
427 b_width - CONE_WIDTH + BORDER_WIDTH,
|
|
|
428 CONE_HEIGHT,
|
|
|
429 CONE_WIDTH / 2 - BORDER_WIDTH,
|
|
|
430 BORDER_WIDTH, False);
|
|
|
431 XDrawLine (b_dpy, b_win, b_shadowGC,
|
|
|
432 b_width,
|
|
|
433 0,
|
|
|
434 b_width - CONE_WIDTH / 2 - BORDER_WIDTH_HALF,
|
|
|
435 CONE_HEIGHT);
|
|
|
436 XDrawLine (b_dpy, b_win, b_shineGC,
|
|
|
437 b_width,
|
|
|
438 0,
|
|
|
439 b_width - CONE_WIDTH + BORDER_WIDTH_HALF,
|
|
|
440 CONE_HEIGHT);
|
|
|
441 }
|
|
|
442 else if (SHAPE_CONE_BOTTOM_LEFT == shape)
|
|
|
443 {
|
|
|
444 XClearArea (b_dpy, b_win,
|
|
|
445 CONE_WIDTH / 2 + BORDER_WIDTH,
|
|
|
446 b_height - CONE_HEIGHT - BORDER_WIDTH,
|
|
|
447 CONE_WIDTH / 2 - BORDER_WIDTH,
|
|
|
448 BORDER_WIDTH, False);
|
|
|
449 XDrawLine (b_dpy, b_win, b_shadowGC,
|
|
|
450 0,
|
|
|
451 b_height - 1,
|
|
|
452 CONE_WIDTH,
|
|
|
453 b_height - 1 - CONE_HEIGHT);
|
|
|
454 XDrawLine (b_dpy, b_win, b_shineGC,
|
|
|
455 0,
|
|
|
456 b_height - 1,
|
|
|
457 CONE_WIDTH / 2 + BORDER_WIDTH,
|
|
|
458 b_height - 1 - CONE_HEIGHT);
|
|
|
459 }
|
|
|
460 else if (SHAPE_CONE_BOTTOM_RIGHT == shape)
|
|
|
461 {
|
|
|
462 XClearArea (b_dpy, b_win,
|
|
|
463 b_width - 1 - CONE_WIDTH + BORDER_WIDTH,
|
|
|
464 b_height - CONE_HEIGHT - BORDER_WIDTH,
|
|
|
465 CONE_WIDTH / 2 - BORDER_WIDTH - 1,
|
|
|
466 BORDER_WIDTH, False);
|
|
|
467 XDrawLine (b_dpy, b_win, b_shadowGC,
|
|
|
468 b_width - 1,
|
|
|
469 b_height - 1,
|
|
|
470 b_width - 1 - CONE_WIDTH,
|
|
|
471 b_height - 1 - CONE_HEIGHT);
|
|
|
472 XDrawLine (b_dpy, b_win, b_shineGC,
|
|
|
473 b_width - 1,
|
|
|
474 b_height - 1,
|
|
|
475 b_width - 1 - CONE_WIDTH / 2 - BORDER_WIDTH,
|
|
|
476 b_height - 1 - CONE_HEIGHT);
|
|
|
477 }
|
|
|
478 }
|
|
|
479
|
|
|
480 }
|
|
|
481
|
|
|
482 /*============================================================================
|
|
|
483
|
|
|
484 ============================================================================*/
|
|
|
485
|
|
|
486 static void
|
|
|
487 balloon_help_destroy (void)
|
|
|
488 {
|
|
|
489 assert (b_dpy != NULL);
|
|
|
490 b_dpy = NULL;
|
|
|
491
|
|
|
492 destroy_window (b_dpy, b_win);
|
|
|
493 destroy_gc (b_dpy, b_gc);
|
|
|
494
|
|
|
495 destroy_gc (b_dpy, b_shineGC);
|
|
|
496 destroy_gc (b_dpy, b_shadowGC);
|
|
|
497
|
|
|
498 destroy_pixmap_mask ();
|
|
|
499 destroy_gc (b_dpy, b_maskGC);
|
|
|
500
|
|
|
501 if (b_timer) XtRemoveTimeOut (b_timer);
|
|
|
502 }
|
|
|
503
|
|
|
504 void
|
|
|
505 balloon_help_create (Display* dpy,
|
|
|
506 Pixel fg, Pixel bg, Pixel shine, Pixel shadow,
|
|
|
507 XFontStruct* font)
|
|
|
508 {
|
|
|
509 if (b_dpy) balloon_help_destroy ();
|
|
|
510
|
|
|
511 b_dpy = dpy;
|
|
|
512
|
|
|
513 b_fontStruct = font;
|
|
|
514
|
|
|
515 b_win = create_window (dpy, bg);
|
|
|
516 b_gc = create_gc (dpy, b_win, fg, bg, b_fontStruct);
|
|
|
517
|
|
|
518 b_shineGC = create_gc (dpy, b_win, shine, bg, b_fontStruct);
|
|
|
519 b_shadowGC = create_gc (dpy, b_win, shadow, bg, b_fontStruct);
|
|
|
520
|
|
|
521 create_pixmap_mask (1, 1);
|
|
|
522 b_maskGC = create_gc (dpy, b_mask, bg, fg, b_fontStruct);
|
|
|
523
|
|
|
524 b_winMapped = False;
|
|
|
525 b_timer = None;
|
|
|
526 b_delay = 500;
|
|
|
527
|
|
|
528 b_screenWidth = DisplayWidth (b_dpy, DefaultScreen(b_dpy));
|
|
|
529 b_screenHeight = DisplayHeight (b_dpy, DefaultScreen(b_dpy));
|
|
|
530
|
|
|
531 b_lastShape = SHAPE_CONE_FREE;
|
|
|
532 }
|
|
|
533
|
|
|
534 void
|
|
|
535 balloon_help_set_delay (unsigned long milliseconds)
|
|
|
536 {
|
|
|
537 b_delay = milliseconds;
|
|
|
538 }
|
|
|
539
|
|
|
540 void
|
|
442
|
541 balloon_help_show (const char* text)
|
|
428
|
542 {
|
|
|
543 assert (b_dpy != NULL);
|
|
|
544
|
|
|
545 /* We don't copy the text */
|
|
|
546 b_text = text;
|
|
|
547 b_lastShape = SHAPE_CONE_FREE;
|
|
|
548
|
|
|
549 if (b_winMapped)
|
|
|
550 {
|
|
|
551 /* If help is already being shown, don't delay just update */
|
|
|
552 show_help (NULL, NULL);
|
|
|
553 }
|
|
|
554 else
|
|
|
555 {
|
|
|
556 b_timer =
|
|
|
557 XtAppAddTimeOut (XtDisplayToApplicationContext(b_dpy),
|
|
|
558 b_delay, show_help, NULL);
|
|
|
559 }
|
|
|
560 }
|
|
|
561
|
|
|
562 void
|
|
|
563 balloon_help_hide (void)
|
|
|
564 {
|
|
|
565 assert (b_dpy != NULL);
|
|
|
566
|
|
|
567 b_text = NULL;
|
|
|
568 XUnmapWindow (b_dpy, b_win);
|
|
|
569 b_winMapped = False;
|
|
|
570 if (b_timer)
|
|
|
571 {
|
|
|
572 XtRemoveTimeOut (b_timer);
|
|
|
573 b_timer = None;
|
|
|
574 }
|
|
|
575 }
|
|
|
576
|
|
|
577 void
|
|
|
578 balloon_help_move_to_pointer (void)
|
|
|
579 {
|
|
|
580 assert (b_dpy != NULL);
|
|
|
581
|
|
|
582 if (b_winMapped)
|
|
|
583 {
|
|
|
584 int x, y;
|
|
|
585 int shape = b_lastShape;
|
|
|
586
|
|
|
587 get_pointer_xy (b_dpy, &x, &y);
|
|
|
588
|
|
|
589 x += (shape & SHAPE_CONE_LEFT) ? POINTER_OFFSET : -POINTER_OFFSET;
|
|
|
590 y += (shape & SHAPE_CONE_TOP) ? POINTER_OFFSET : -POINTER_OFFSET;
|
|
|
591
|
|
|
592 shape = get_shape (shape, x, y, b_width, b_height, b_screenWidth, b_screenHeight);
|
|
|
593
|
|
|
594 if (shape == b_lastShape)
|
|
|
595 {
|
|
|
596 XMoveWindow (b_dpy, b_win,
|
|
|
597 shape & SHAPE_CONE_LEFT ? x : x - b_width,
|
|
|
598 shape & SHAPE_CONE_TOP ? y : y - b_height);
|
|
|
599 }
|
|
|
600 else
|
|
|
601 {
|
|
|
602 /* text would be off screen, rebuild with new shape */
|
|
|
603 b_lastShape = SHAPE_CONE_FREE;
|
|
|
604 show_help (NULL, NULL);
|
|
|
605 }
|
|
|
606 }
|
|
|
607 }
|
