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 "DropDown.h"
  10
  11 #include <iostream>
  12
  13 extern "C" void C_DropDownCompletedCB(FL_OBJECT * ob, long)
  14 {
  15         DropDown * d = static_cast<DropDown*>(ob->form->u_vdata);
  16         d->completed();
  17 }
  18
  19
  20 extern "C" int C_DropDownPeekEventCB(FL_FORM * form, void *xev)
  21 {
  22         DropDown * d = static_cast<DropDown*>(form->u_vdata);
  23         return d->peek(static_cast<XEvent*>(xev));
  24 }
  25
  26
  27 DropDown::DropDown(LyXView * lv, FL_OBJECT * ob)
  28         : lv_(lv)
  29 {
  30         form_ = fl_bgn_form(FL_NO_BOX, ob->w, 100);
  31         fl_add_box(FL_UP_BOX, 0, 0, ob->w, 100, "");
  32         browser_ = fl_add_browser(FL_SELECT_BROWSER, 0, 0, ob->w, 100, "");
  33         form_->u_vdata = this;
  34         fl_set_browser_dblclick_callback(browser_, C_DropDownCompletedCB, 0);
  35         fl_register_raw_callback(form_, KeyPressMask|ButtonPressMask, C_DropDownPeekEventCB);
  36         fl_end_form();
  37 }
  38
  39
  40 DropDown::~DropDown()
  41 {
  42         if (form_->visible)
  43                 fl_hide_form(form_);
  44         fl_free_form(form_);
  45 }
  46
  47
  48 void DropDown::select(std::vector<string> const & choices, int x, int y, int w)
  49 {
  50         fl_set_form_geometry(form_, x, y, w, 100);
  51         fl_clear_browser(browser_);
  52         for (std::vector<string>::const_iterator cit = choices.begin();
  53                 cit != choices.end(); ++cit) {
  54                 fl_add_browser_line(browser_, cit->c_str());
  55         }
  56         fl_show_form(form_, FL_PLACE_POSITION, FL_NOBORDER, "");
  57         XGrabPointer(fl_get_display(), form_->window, false,
  58                      ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
  59                      GrabModeAsync, GrabModeAsync, 0, 0, 0);
  60         XFlush(fl_get_display());
  61 }
  62
  63
  64 void DropDown::line_up()
  65 {
  66         if (fl_get_browser(browser_) > 1)
  67                 fl_select_browser_line(browser_, fl_get_browser(browser_) - 1);
  68         if (fl_get_browser(browser_) >= fl_get_browser_topline(browser_) +
  69                 fl_get_browser_screenlines(browser_))
  70                         fl_set_browser_topline(browser_, fl_get_browser(browser_)
  71                                 - fl_get_browser_screenlines(browser_) + 1);
  72         if (fl_get_browser(browser_) < fl_get_browser_topline(browser_))
  73                 fl_set_browser_topline(browser_, fl_get_browser(browser_));
  74 }
  75
  76
  77 void DropDown::line_down()
  78 {
  79         if (fl_get_browser(browser_) < fl_get_browser_maxline(browser_))
  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 int DropDown::peek(XEvent * xev)
  91 {
  92         int x,y;
  93         unsigned int keymask;
  94
  95         fl_get_mouse(&x, &y, &keymask);
  96
  97         if (xev->type == ButtonPress) {
  98                 if (!(x >= form_->x && x <= (form_->x + form_->w) &&
  99                         y >= form_->y && y << (form_->y + form_->h))) {
 100                         fl_hide_form(form_);
 101                         return 1;
 102                 }
 103         } else if (xev->type == KeyPress) {
 104                 char s_r[10]; s_r[9] = '\0';
 105                 KeySym keysym_return;
 106                 XLookupString(&xev->xkey, s_r, 10, &keysym_return, 0);
 107                 switch (keysym_return) {
 108                         case XK_Down:
 109                                 line_down();
 110                                 return 1;
 111                         case XK_Up:
 112                                 line_up();
 113                                 return 1;
 114                         case XK_Return:
 115                                 completed();
 116                                 return 1;
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122
 123 void DropDown::completed()
 124 {
 125         string selection;
 126         int i = fl_get_browser(browser_);
 127         if (i == -1)
 128                 selection = "";
 129         else
 130                 selection = fl_get_browser_line(browser_, i);
 131         fl_hide_form(form_);
 132
 133         result.emit(selection);
 134 }