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