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