src/frontends/xforms/DropDown.C

   1 /**
   2  * \file DropDown.C
   3  * Copyright 2001 the LyX Team
   4  * Read the file COPYING
   5  *
   6  * \author John Levon, moz@compsoc.man.ac.uk
   7  */
   8
   9 #include <config.h>
  10
  11 #ifdef __GNUG__
  12 #pragma implementation
  13 #endif
  14
  15 #include "DropDown.h"
  16 #include "xforms_helpers.h"
  17
  18 #include <iostream>
  19 #include <cctype>
  20
  21
  22 #ifndef CXX_GLOBAL_CSTD
  23 using std::isprint;
  24 #endif
  25
  26 using std::vector;
  27
  28
  29 namespace {
  30
  31 extern "C" void C_CompletedCB(FL_OBJECT * ob, long)
  32 {
  33         DropDown * d = static_cast<DropDown*>(ob->u_vdata);
  34         d->completed();
  35 }
  36
  37
  38 extern "C" int C_PeekCB(FL_FORM * form, void *xev)
  39 {
  40         DropDown * d = static_cast<DropDown*>(form->u_vdata);
  41         return d->peek(static_cast<XEvent*>(xev));
  42 }
  43
  44 } // namespace anon
  45
  46
  47 DropDown::DropDown(LyXView * lv, FL_OBJECT * ob)
  48         : lv_(lv)
  49 {
  50         form_ = fl_bgn_form(FL_NO_BOX, ob->w, 100);
  51         fl_add_box(FL_UP_BOX, 0, 0, ob->w, 100, "");
  52         browser_ = fl_add_browser(FL_SELECT_BROWSER, 0, 0, ob->w, 100, "");
  53         form_->u_vdata = this;
  54         browser_->u_vdata = this;
  55         fl_set_object_callback(browser_, C_CompletedCB, 0);
  56         fl_register_raw_callback(form_, KeyPressMask|ButtonPressMask, C_PeekCB);
  57         fl_end_form();
  58 }
  59
  60
  61 DropDown::~DropDown()
  62 {
  63         if (form_->visible)
  64                 fl_hide_form(form_);
  65         fl_free_form(form_);
  66 }
  67
  68
  69 void DropDown::select(vector<string> const & choices, int x, int y, int w)
  70 {
  71         if (choices.empty())
  72                 return;
  73
  74         fl_set_form_geometry(form_, x, y-100, w, 100);
  75         fl_clear_browser(browser_);
  76
  77         vector<string>::const_iterator cit = choices.begin();
  78         vector<string>::const_iterator end = choices.end();
  79         for (; cit != end; ++cit) {
  80                 fl_add_browser_line(browser_, cit->c_str());
  81         }
  82         fl_select_browser_line(browser_, 1);
  83         fl_show_form(form_, FL_PLACE_POSITION, FL_NOBORDER, "");
  84         XGrabPointer(fl_get_display(), form_->window, false,
  85                      ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
  86                      GrabModeAsync, GrabModeAsync, 0, 0, 0);
  87         XFlush(fl_get_display());
  88 }
  89
  90
  91 void DropDown::line_up()
  92 {
  93         if (fl_get_browser(browser_) > 1)
  94                 fl_select_browser_line(browser_, fl_get_browser(browser_) - 1);
  95         if (fl_get_browser(browser_) >= fl_get_browser_topline(browser_) +
  96             fl_get_browser_screenlines(browser_))
  97                 fl_set_browser_topline(browser_, fl_get_browser(browser_)
  98                                        - fl_get_browser_screenlines(browser_) + 1);
  99         if (fl_get_browser(browser_) < fl_get_browser_topline(browser_))
 100                 fl_set_browser_topline(browser_, fl_get_browser(browser_));
 101 }
 102
 103
 104 void DropDown::line_down()
 105 {
 106         if (fl_get_browser(browser_) < fl_get_browser_maxline(browser_))
 107                 fl_select_browser_line(browser_, fl_get_browser(browser_) + 1);
 108         if (fl_get_browser(browser_) >= fl_get_browser_topline(browser_) +
 109             fl_get_browser_screenlines(browser_))
 110                 fl_set_browser_topline(browser_, fl_get_browser(browser_)
 111                                        - fl_get_browser_screenlines(browser_) + 1);
 112         if (fl_get_browser(browser_) < fl_get_browser_topline(browser_))
 113                 fl_set_browser_topline(browser_, fl_get_browser(browser_));
 114 }
 115
 116
 117 int DropDown::peek(XEvent * xev)
 118 {
 119         int x,y;
 120         unsigned int keymask;
 121
 122         fl_get_mouse(&x, &y, &keymask);
 123
 124         if (xev->type == ButtonPress) {
 125                 if (!(x >= form_->x && x <= (form_->x + form_->w) &&
 126                       y >= form_->y && y << (form_->y + form_->h))) {
 127                         fl_hide_form(form_);
 128                         return 1;
 129                 }
 130                 XUngrabPointer(fl_get_display(), CurrentTime);
 131         } else if (xev->type == KeyPress) {
 132                 char s_r[10]; s_r[9] = '\0';
 133                 KeySym keysym_return;
 134                 XLookupString(&xev->xkey, s_r, 10, &keysym_return, 0);
 135                 switch (keysym_return) {
 136                 case XK_Down:
 137                         line_down();
 138                         return 1;
 139                 case XK_Up:
 140                         line_up();
 141                         return 1;
 142                 case XK_Return:
 143                         completed();
 144                         return 1;
 145                 case XK_Escape:
 146                         fl_deselect_browser(browser_);
 147                         completed();
 148                         return 1;
 149                 default:
 150                         // FIXME: if someone has a got a way to
 151                         // convince the event to fall back to the
 152                         // minibuffer, I'm glad to hear it.
 153                         // fl_XPutBackEvent() doesn't work.
 154
 155                         // This is a bit less elegant perhaps, but works
 156                         // well enough. Angus 11 Jan 2002
 157                         if (s_r[0] && isprint(s_r[0])) {
 158                                 key_pressed(s_r[0]);
 159                                 return 1;
 160                         }
 161                 }
 162         }
 163         return 0;
 164 }
 165
 166
 167 void DropDown::completed()
 168 {
 169         XUngrabPointer(fl_get_display(), CurrentTime);
 170         fl_hide_form(form_);
 171         result(getSelectedStringFromBrowser(browser_));
 172 }
 173
 174
 175 void DropDown::key_pressed(char c)
 176 {
 177         XUngrabPointer(fl_get_display(), CurrentTime);
 178         fl_hide_form(form_);
 179         keypress(c);
 180 }