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