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