src/Fl_Value_Input.cxx

   1 //
   2 // "$Id: Fl_Value_Input.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // Value input widget for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 // FLTK widget for drag-adjusting a floating point value.
  29 // Warning: this works by making a child Fl_Input object, even
  30 // though this object is *not* an Fl_Group.  May be a kludge?
  31
  32 #include <FL/Fl.H>
  33 #include <FL/Fl_Value_Input.H>
  34 #include <FL/Fl_Group.H>
  35 #include <stdlib.h>
  36 #include <FL/math.h>
  37
  38
  39 void Fl_Value_Input::input_cb(Fl_Widget*, void* v) {
  40   Fl_Value_Input& t = *(Fl_Value_Input*)v;
  41   double nv;
  42   if ((t.step() - floor(t.step()))>0.0 || t.step() == 0.0) nv = strtod(t.input.value(), 0);
  43   else nv = strtol(t.input.value(), 0, 0);
  44   if (nv != t.value() || t.when() & FL_WHEN_NOT_CHANGED) {
  45     t.set_value(nv);
  46     t.set_changed();
  47     if (t.when()) t.do_callback();
  48   }
  49 }
  50
  51 void Fl_Value_Input::draw() {
  52   if (damage()&~FL_DAMAGE_CHILD) input.clear_damage(FL_DAMAGE_ALL);
  53   input.box(box());
  54   input.color(color(), selection_color());
  55   Fl_Widget *i = &input; i->draw(); // calls protected input.draw()
  56   input.clear_damage();
  57 }
  58
  59 void Fl_Value_Input::resize(int X, int Y, int W, int H) {
  60   Fl_Valuator::resize(X, Y, W, H);
  61   input.resize(X, Y, W, H);
  62 }
  63
  64 void Fl_Value_Input::value_damage() {
  65   char buf[128];
  66   format(buf);
  67   input.value(buf);
  68   input.mark(input.position()); // turn off selection highlight
  69 }
  70
  71 int Fl_Value_Input::handle(int event) {
  72   double v;
  73   int delta;
  74   int mx = Fl::event_x_root();
  75   static int ix, drag;
  76   input.when(when());
  77   switch (event) {
  78   case FL_PUSH:
  79     if (!step()) goto DEFAULT;
  80     ix = mx;
  81     drag = Fl::event_button();
  82     handle_push();
  83     return 1;
  84   case FL_DRAG:
  85     if (!step()) goto DEFAULT;
  86     delta = mx-ix;
  87     if (delta > 5) delta -= 5;
  88     else if (delta < -5) delta += 5;
  89     else delta = 0;
  90     switch (drag) {
  91     case 3: v = increment(previous_value(), delta*100); break;
  92     case 2: v = increment(previous_value(), delta*10); break;
  93     default:v = increment(previous_value(), delta); break;
  94     }
  95     v = round(v);
  96     handle_drag(soft()?softclamp(v):clamp(v));;
  97     return 1;
  98   case FL_RELEASE:
  99     if (!step()) goto DEFAULT;
 100     if (value() != previous_value() || !Fl::event_is_click())
 101       handle_release();
 102     else {
 103       Fl_Widget_Tracker wp(&input);
 104       input.handle(FL_PUSH);
 105       if (wp.exists())
 106         input.handle(FL_RELEASE);
 107     }
 108     return 1;
 109   case FL_FOCUS:
 110     return input.take_focus();
 111   case FL_SHORTCUT:
 112     return input.handle(event);
 113   default:
 114   DEFAULT:
 115     input.type(((step() - floor(step()))>0.0 || step() == 0.0) ? FL_FLOAT_INPUT : FL_INT_INPUT);
 116     return input.handle(event);
 117   }
 118 }
 119
 120 /**
 121   Creates a new Fl_Value_Input widget using the given
 122   position, size, and label string. The default boxtype is
 123   FL_DOWN_BOX.
 124 */
 125 Fl_Value_Input::Fl_Value_Input(int X, int Y, int W, int H, const char* l)
 126 : Fl_Valuator(X, Y, W, H, l), input(X, Y, W, H, 0) {
 127   soft_ = 0;
 128   if (input.parent())  // defeat automatic-add
 129     input.parent()->remove(input);
 130   input.parent((Fl_Group *)this); // kludge!
 131   input.callback(input_cb, this);
 132   input.when(FL_WHEN_CHANGED);
 133   box(input.box());
 134   color(input.color());
 135   selection_color(input.selection_color());
 136   align(FL_ALIGN_LEFT);
 137   value_damage();
 138   set_flag(SHORTCUT_LABEL);
 139 }
 140
 141 Fl_Value_Input::~Fl_Value_Input() {
 142
 143   if (input.parent() == (Fl_Group *)this)
 144     input.parent(0);   // *revert* ctor kludge!
 145 }
 146
 147 //
 148 // End of "$Id: Fl_Value_Input.cxx 7903 2010-11-28 21:06:39Z matt $".
 149 //