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