| 1 |
/* packer.hh |
| 2 |
* This file is part of ndk library |
| 3 |
* Copyright (c) 2003,2004 by Stanislav Ievlev |
| 4 |
* |
| 5 |
* This file is covered by the GNU Library General Public License, |
| 6 |
* which should be included with libndk as the file COPYING. |
| 7 |
*/ |
| 8 |
#ifndef NDK_PACKER_HH__ |
| 9 |
#define NDK_PACKER_HH__ |
| 10 |
|
| 11 |
#include <algorithm> |
| 12 |
#include <functional> |
| 13 |
#include <vector> |
| 14 |
|
| 15 |
#include <ndk/align.hh> |
| 16 |
#include <ndk/panel.hh> |
| 17 |
#include <ndk/support.hh> |
| 18 |
|
| 19 |
namespace ndk |
| 20 |
{ |
| 21 |
namespace pack /**< packer strategies */ |
| 22 |
{ |
| 23 |
struct vertical /**< vertical packing strategy */ |
| 24 |
{ |
| 25 |
static int align_coord (panel *p) |
| 26 |
{ |
| 27 |
return p->x (); |
| 28 |
} |
| 29 |
|
| 30 |
static int align_size (panel *p) |
| 31 |
{ |
| 32 |
return p->width (); |
| 33 |
} |
| 34 |
|
| 35 |
static void align_move (panel *p, int pos) |
| 36 |
{ |
| 37 |
p->move (pos, p->y (), absolute); |
| 38 |
} |
| 39 |
|
| 40 |
static void align_resize (panel *p, int size) |
| 41 |
{ |
| 42 |
const bool need_update = (p->width () != size); |
| 43 |
|
| 44 |
p->resize (size, p->height ()); |
| 45 |
if (need_update) |
| 46 |
p->draw (); |
| 47 |
} |
| 48 |
|
| 49 |
static int line_coord (panel *p) |
| 50 |
{ |
| 51 |
return p->y (); |
| 52 |
} |
| 53 |
|
| 54 |
static int line_size (panel *p) |
| 55 |
{ |
| 56 |
return p->height (); |
| 57 |
} |
| 58 |
|
| 59 |
static void line_move (panel *p, int pos) |
| 60 |
{ |
| 61 |
p->move (p->x (), pos, absolute); |
| 62 |
} |
| 63 |
|
| 64 |
static void resize (panel *p, int align_size, int line_size) |
| 65 |
{ |
| 66 |
p->resize (align_size, line_size); |
| 67 |
} |
| 68 |
}; |
| 69 |
|
| 70 |
struct horizontal /**< horizontal packing strategy */ |
| 71 |
{ |
| 72 |
static int align_coord (panel *p) |
| 73 |
{ |
| 74 |
return p->y (); |
| 75 |
} |
| 76 |
|
| 77 |
static int align_size (panel *p) |
| 78 |
{ |
| 79 |
return p->height (); |
| 80 |
} |
| 81 |
|
| 82 |
static void align_move (panel *p, int pos) |
| 83 |
{ |
| 84 |
p->move (p->x (), pos, absolute); |
| 85 |
} |
| 86 |
|
| 87 |
static void align_resize (panel *p, int size) |
| 88 |
{ |
| 89 |
const bool need_update = (p->height () != size); |
| 90 |
|
| 91 |
p->resize (p->width (), size); |
| 92 |
if (need_update) |
| 93 |
p->draw (); |
| 94 |
} |
| 95 |
|
| 96 |
static int line_coord (panel *p) |
| 97 |
{ |
| 98 |
return p->x (); |
| 99 |
} |
| 100 |
|
| 101 |
static int line_size (panel *p) |
| 102 |
{ |
| 103 |
return p->width (); |
| 104 |
} |
| 105 |
|
| 106 |
static void line_move (panel *p, int pos) |
| 107 |
{ |
| 108 |
p->move (pos, p->y (), absolute); |
| 109 |
} |
| 110 |
|
| 111 |
static void resize (panel *p, int align_size, int line_size) |
| 112 |
{ |
| 113 |
p->resize (line_size, align_size); |
| 114 |
} |
| 115 |
}; |
| 116 |
|
| 117 |
template<class T> |
| 118 |
struct def_resizer /**< default resize policy for the packer object */ |
| 119 |
{ |
| 120 |
static void fix_item (panel *p, int, int pos) |
| 121 |
{ |
| 122 |
T::align_move (p, pos); |
| 123 |
} |
| 124 |
|
| 125 |
static void fix_panel (panel *p, int align_size, int line_size) |
| 126 |
{ |
| 127 |
T::resize (p, align_size, line_size); |
| 128 |
} |
| 129 |
|
| 130 |
static void draw (panel *p) |
| 131 |
{ |
| 132 |
p->draw (); |
| 133 |
} |
| 134 |
}; |
| 135 |
|
| 136 |
template<class T> |
| 137 |
struct no_resizer /**< * this policy don't made resize of the object */ |
| 138 |
{ |
| 139 |
static void fix_item (panel *p, int size, int pos) |
| 140 |
{ |
| 141 |
T::align_move (p, pos); |
| 142 |
T::align_resize (p, size); |
| 143 |
} |
| 144 |
|
| 145 |
static void fix_panel (panel *, int, int) |
| 146 |
{ |
| 147 |
} |
| 148 |
|
| 149 |
static void draw (panel *) |
| 150 |
{ |
| 151 |
} |
| 152 |
}; |
| 153 |
} |
| 154 |
|
| 155 |
template<class T> |
| 156 |
bool |
| 157 |
wider_panel (panel *p1, panel *p2) |
| 158 |
{ |
| 159 |
/**< compare panels, who is wider */ |
| 160 |
return T::align_size (p1) < T::align_size (p2); |
| 161 |
} |
| 162 |
|
| 163 |
/** |
| 164 |
* general template to the auto packer/aligner of widgets |
| 165 |
* packer algorithm: |
| 166 |
* with resizer: |
| 167 |
* 1. find widget with maximum size (max) |
| 168 |
* 2. main widget size is max + 2*padding |
| 169 |
* 3. align all widgets and place it with begining from padding |
| 170 |
* 4. resize main to size max + 2*padding, and total widgets length+2*padding |
| 171 |
* without resizer: |
| 172 |
* 1. find widget with maximum size |
| 173 |
* 2. align all widgets, according max widget size and with begining from padding |
| 174 |
* 3. resize all widgets to the "main - 2*padding" if we need it |
| 175 |
*/ |
| 176 |
template<class T, template<class> class resizer = pack::def_resizer> |
| 177 |
class packer |
| 178 |
{ |
| 179 |
typedef std::vector<panel *> widget_vector; |
| 180 |
typedef resizer<T> resizer_type; |
| 181 |
|
| 182 |
public: |
| 183 |
packer (panel *main, align::type alignment, int padding = 0) |
| 184 |
: main_ (main) |
| 185 |
, padding_ (padding) |
| 186 |
, align_ (alignment) |
| 187 |
{ |
| 188 |
} |
| 189 |
|
| 190 |
void add (panel *item) |
| 191 |
{ |
| 192 |
widgets_.push_back (item); |
| 193 |
resizer_type::draw (item); /* in auto resize method we need to draw widgets to know it's real sizes */ |
| 194 |
} |
| 195 |
|
| 196 |
void pack () /**< move and align widgets */ |
| 197 |
{ |
| 198 |
if (widgets_.empty ()) |
| 199 |
return; |
| 200 |
|
| 201 |
/* first made alignment */ |
| 202 |
widget_vector::const_iterator max_item = |
| 203 |
std::max_element (widgets_.begin (), widgets_.end (), wider_panel<T> ); |
| 204 |
const int align_size = T::align_size (*max_item) + main_->padding () * 2; |
| 205 |
foreach (panel *widget, widgets_) |
| 206 |
do_align (widget, T::align_size (*max_item)); |
| 207 |
|
| 208 |
int pos = main_->padding (); |
| 209 |
foreach (panel *widget, widgets_) |
| 210 |
do_move (widget, pos); |
| 211 |
const int line_size = pos - padding_ + main_->padding (); |
| 212 |
|
| 213 |
resizer_type::fix_panel (main_, align_size, line_size); /* try to fix size of the panel */ |
| 214 |
} |
| 215 |
|
| 216 |
private: |
| 217 |
void do_align (panel *p, int max) /**< align panel's possition according current aligment */ |
| 218 |
{ |
| 219 |
resizer_type::fix_item (p, T::align_size (main_) - 2 * main_->padding (), |
| 220 |
T::align_coord (main_) + |
| 221 |
main_->padding () + |
| 222 |
align::pos (T::align_size (p), max, align_)); |
| 223 |
} |
| 224 |
|
| 225 |
void do_move (panel *p, int &pos) /**< move next item according current packing */ |
| 226 |
{ |
| 227 |
T::line_move (p, T::line_coord (main_) + pos); |
| 228 |
pos += T::line_size (p) + padding_; |
| 229 |
} |
| 230 |
|
| 231 |
widget_vector widgets_; /**< widgets to pack */ |
| 232 |
panel *main_; /**< main widget, we will try to place all widgets under it*/ |
| 233 |
int padding_; /**< size of empty area between widgets on the line */ |
| 234 |
align::type align_; /**< aligment of the widgets */ |
| 235 |
}; |
| 236 |
|
| 237 |
typedef packer<pack::horizontal> horizontal_packer; |
| 238 |
typedef packer<pack::vertical> vertical_packer; |
| 239 |
} |
| 240 |
|
| 241 |
#endif |
