cppconsui/ListBox.cpp

   1 /*
   2  * Copyright (C) 2007 by Mark Pustjens <pustjens@dds.nl>
   3  * Copyright (C) 2010-2012 by CenterIM developers
   4  *
   5  * This file is part of CenterIM.
   6  *
   7  * CenterIM is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * CenterIM is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 /**
  23  * @file
  24  * ListBox class implementation.
  25  *
  26  * @ingroup cppconsui
  27  */
  28
  29 #include "ListBox.h"
  30
  31 namespace CppConsUI
  32 {
  33
  34 ListBox::ListBox(int w, int h)
  35 : AbstractListBox(w, h), children_height(0), autosize_children(0)
  36 , autosize_height(0), reposition_widgets(false)
  37 {
  38   // allow fast focus changing (paging) using PageUp/PageDown keys
  39   page_focus = true;
  40 }
  41
  42 void ListBox::Draw()
  43 {
  44   ProceedUpdateArea();
  45   // set virtual scroll area width
  46   if (screen_area)
  47     SetScrollWidth(screen_area->getmaxx());
  48   UpdateScrollHeight();
  49   if (update_area)
  50     reposition_widgets = true;
  51   ProceedUpdateVirtualArea();
  52
  53   if (!area) {
  54     // scrollpane will clear the screen (real) area
  55     AbstractListBox::Draw();
  56     return;
  57   }
  58
  59   if (reposition_widgets) {
  60     autosize_height = 1;
  61     int autosize_height_extra = 0;
  62     int realh = area->getmaxy();
  63     if (autosize_children && children_height < realh) {
  64       int space = realh - (children_height - autosize_children);
  65       autosize_height = space / autosize_children;
  66       autosize_height_extra = space % autosize_children;
  67     }
  68     autosize_extra.clear();
  69
  70     int y = 0;
  71     for (Children::iterator i = children.begin(); i != children.end(); i++) {
  72       Widget *widget = i->widget;
  73       if (!widget->IsVisible())
  74         continue;
  75
  76       int h = widget->GetHeight();
  77       if (h == AUTOSIZE) {
  78         h = autosize_height;
  79         if (autosize_height_extra) {
  80           autosize_extra.insert(widget);
  81           autosize_height_extra--;
  82           h++;
  83         }
  84
  85         // make sure the area is updated
  86         widget->UpdateArea();
  87       }
  88
  89       widget->Move(0, y);
  90       y += h;
  91     }
  92     reposition_widgets = false;
  93   }
  94
  95   // make sure that currently focused widget is visible
  96   if (focus_child) {
  97     int h = focus_child->GetHeight();
  98     if (h == AUTOSIZE) {
  99       h = autosize_height;
 100       if (autosize_extra.find(focus_child) != autosize_extra.end())
 101         h++;
 102     }
 103
 104     MakeVisible(focus_child->GetLeft(), focus_child->GetTop(), 1, h);
 105   }
 106
 107   AbstractListBox::Draw();
 108 }
 109
 110 HorizontalLine *ListBox::InsertSeparator(size_t pos)
 111 {
 112   HorizontalLine *l = new HorizontalLine(AUTOSIZE);
 113   InsertWidget(pos, *l);
 114   return l;
 115 }
 116
 117 HorizontalLine *ListBox::AppendSeparator()
 118 {
 119   HorizontalLine *l = new HorizontalLine(AUTOSIZE);
 120   AppendWidget(*l);
 121   return l;
 122 }
 123
 124 void ListBox::InsertWidget(size_t pos, Widget& widget)
 125 {
 126   if (widget.IsVisible()) {
 127     int h = widget.GetHeight();
 128     if (h == AUTOSIZE) {
 129       h = 1;
 130       autosize_children++;
 131     }
 132     children_height += h;
 133     UpdateScrollHeight();
 134   }
 135
 136   // note: widget is moved to a correct position in Draw() method
 137   ScrollPane::InsertWidget(pos, widget, 0, 0);
 138   reposition_widgets = true;
 139
 140   if (widget.IsVisible())
 141     signal_children_height_change(*this, children_height);
 142 }
 143
 144 void ListBox::AppendWidget(Widget& widget)
 145 {
 146   InsertWidget(children.size(), widget);
 147 }
 148
 149 Curses::Window *ListBox::GetSubPad(const Widget& child, int begin_x,
 150     int begin_y, int ncols, int nlines)
 151 {
 152   // autosize
 153   if (nlines == AUTOSIZE) {
 154     nlines = autosize_height;
 155     if (autosize_extra.find(&child) != autosize_extra.end())
 156       nlines++;
 157   }
 158
 159   return AbstractListBox::GetSubPad(child, begin_x, begin_y, ncols, nlines);
 160 }
 161
 162 void ListBox::OnChildMoveResize(Widget& /*activator*/, const Rect& oldsize,
 163     const Rect& newsize)
 164 {
 165   int old_height = oldsize.GetHeight();
 166   int new_height = newsize.GetHeight();
 167   if (old_height != new_height) {
 168     if (old_height == AUTOSIZE) {
 169       old_height = 1;
 170       autosize_children--;
 171     }
 172     if (new_height == AUTOSIZE) {
 173       new_height = 1;
 174       autosize_children++;
 175     }
 176     children_height += new_height - old_height;
 177     reposition_widgets = true;
 178     UpdateScrollHeight();
 179
 180     signal_children_height_change(*this, children_height);
 181   }
 182 }
 183
 184 void ListBox::OnChildVisible(Widget& activator, bool visible)
 185 {
 186   // the widget is being hidden or deleted
 187   int height = activator.GetHeight();
 188   int sign = visible ? 1 : -1;
 189   if (height == AUTOSIZE) {
 190     autosize_children += sign;
 191     height = 1;
 192   }
 193   children_height += sign * height;
 194   reposition_widgets = true;
 195   UpdateScrollHeight();
 196
 197   signal_children_height_change(*this, children_height);
 198 }
 199
 200 void ListBox::UpdateScrollHeight()
 201 {
 202   int realh = 0;
 203   if (screen_area)
 204     realh = screen_area->getmaxy();
 205
 206   SetScrollHeight(MAX(realh, children_height));
 207 }
 208
 209 } // namespace CppConsUI
 210
 211 /* vim: set tabstop=2 shiftwidth=2 textwidth=78 expandtab : */