src/frontends/qt4/GuiCommandBuffer.cpp

   1 /**
   2  * \file GuiCommandBuffer.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars
   7  * \author Asger and Jürgen
   8  * \author John Levon
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "GuiCommandBuffer.h"
  16
  17 #include "GuiCommandEdit.h"
  18 #include "GuiView.h"
  19 #include "qt_helpers.h"
  20
  21 #include "BufferView.h"
  22 #include "Cursor.h"
  23 #include "LyXFunc.h"
  24 #include "LyXAction.h"
  25 #include "FuncRequest.h"
  26
  27 #include "support/lyxalgo.h"
  28 #include "support/lstrings.h"
  29
  30 #include <QHBoxLayout>
  31 #include <QKeyEvent>
  32 #include <QListWidget>
  33 #include <QMouseEvent>
  34 #include <QPixmap>
  35 #include <QPushButton>
  36 #include <QToolTip>
  37 #include <QVBoxLayout>
  38
  39 using namespace std;
  40 using namespace lyx::support;
  41
  42 namespace lyx {
  43 namespace frontend {
  44
  45 namespace {
  46
  47 class QTempListBox : public QListWidget {
  48 public:
  49         QTempListBox() {
  50                 //setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  51                 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  52                 setWindowModality(Qt::WindowModal);
  53                 setWindowFlags(Qt::Popup);
  54                 setAttribute(Qt::WA_DeleteOnClose);
  55         }
  56 protected:
  57         void mouseReleaseEvent(QMouseEvent * ev) {
  58                 if (ev->x() < 0 || ev->y() < 0
  59                     || ev->x() > width() || ev->y() > height()) {
  60                         hide();
  61                 } else {
  62                         // emit signal
  63                         itemPressed(currentItem());
  64                 }
  65         }
  66
  67         void keyPressEvent(QKeyEvent * ev) {
  68                 if (ev->key() == Qt::Key_Escape) {
  69                         hide();
  70                         return;
  71                 } else if (ev->key() == Qt::Key_Return || ev->key() == Qt::Key_Space) {
  72                         // emit signal
  73                         itemPressed(currentItem());
  74                 } else
  75                         QListWidget::keyPressEvent(ev);
  76         }
  77 };
  78
  79 } // end of anon
  80
  81
  82 GuiCommandBuffer::GuiCommandBuffer(GuiView * view)
  83         : view_(view), history_pos_(history_.end())
  84 {
  85         transform(lyxaction.func_begin(), lyxaction.func_end(),
  86                 back_inserter(commands_), firster());
  87
  88         QPixmap qpup(":/images/up.png");
  89         QPixmap qpdown(":/images/down.png");
  90
  91         QVBoxLayout * top = new QVBoxLayout(this);
  92         QHBoxLayout * layout = new QHBoxLayout(0);
  93
  94         QPushButton * up = new QPushButton(qpup, "", this);
  95         up->setMaximumSize(24, 24);
  96         QPushButton * down = new QPushButton(qpdown, "", this);
  97         down->setToolTip(qt_("Next command"));
  98         down->setMaximumSize(24, 24);
  99         connect(down, SIGNAL(clicked()), this, SLOT(down()));
 100
 101         edit_ = new GuiCommandEdit(this);
 102         edit_->setMinimumSize(edit_->sizeHint());
 103         edit_->setFocusPolicy(Qt::ClickFocus);
 104
 105         connect(edit_, SIGNAL(escapePressed()), this, SLOT(cancel()));
 106         connect(edit_, SIGNAL(returnPressed()), this, SLOT(dispatch()));
 107         connect(edit_, SIGNAL(tabPressed()), this, SLOT(complete()));
 108         connect(edit_, SIGNAL(upPressed()), this, SLOT(up()));
 109         connect(edit_, SIGNAL(downPressed()), this, SLOT(down()));
 110         connect(edit_, SIGNAL(hidePressed()), this, SLOT(hideParent()));
 111
 112         layout->addWidget(up, 0);
 113         layout->addWidget(down, 0);
 114         layout->addWidget(edit_, 10);
 115         layout->setMargin(0);
 116         top->addLayout(layout);
 117         top->setMargin(0);
 118         setFocusProxy(edit_);
 119 }
 120
 121
 122 void GuiCommandBuffer::cancel()
 123 {
 124         view_->setFocus();
 125         edit_->setText(QString());
 126 }
 127
 128
 129 void GuiCommandBuffer::dispatch()
 130 {
 131         dispatch(fromqstr(edit_->text()));
 132         view_->setFocus();
 133         edit_->setText(QString());
 134         edit_->clearFocus();
 135 }
 136
 137
 138 void GuiCommandBuffer::complete()
 139 {
 140         string const input = fromqstr(edit_->text());
 141         string new_input;
 142         vector<string> comp = completions(input, new_input);
 143
 144         if (comp.empty() && new_input == input) {
 145                 // show_info_suffix(qt_("[no match]"), input);
 146                 return;
 147         }
 148
 149         if (comp.empty()) {
 150                 edit_->setText(toqstr(new_input));
 151         //      show_info_suffix(("[only completion]"), new_input + ' ');
 152                 return;
 153         }
 154
 155         edit_->setText(toqstr(new_input));
 156
 157         QTempListBox * list = new QTempListBox;
 158
 159         // For some reason the scrollview's contents are larger
 160         // than the number of actual items...
 161         vector<string>::const_iterator cit = comp.begin();
 162         vector<string>::const_iterator end = comp.end();
 163         for (; cit != end; ++cit)
 164                 list->addItem(toqstr(*cit));
 165
 166         list->resize(list->sizeHint());
 167         QPoint const pos = edit_->mapToGlobal(QPoint(0, 0));
 168
 169         int const y = max(0, pos.y() - list->height());
 170
 171         list->move(pos.x(), y);
 172
 173         connect(list, SIGNAL(itemPressed(QListWidgetItem *)),
 174                 this, SLOT(complete_selected(QListWidgetItem *)));
 175         connect(list, SIGNAL(itemActivated(QListWidgetItem *)),
 176                 this, SLOT(complete_selected(QListWidgetItem *)));
 177
 178         list->show();
 179         list->setFocus();
 180 }
 181
 182
 183 void GuiCommandBuffer::complete_selected(QListWidgetItem * item)
 184 {
 185         QWidget const * widget = static_cast<QWidget const *>(sender());
 186         const_cast<QWidget *>(widget)->hide();
 187         edit_->setText(item->text() + ' ');
 188         edit_->activateWindow();
 189         edit_->setFocus();
 190 }
 191
 192
 193 void GuiCommandBuffer::up()
 194 {
 195         string const input = fromqstr(edit_->text());
 196         string const h = historyUp();
 197
 198         if (h.empty()) {
 199         //      show_info_suffix(qt_("[Beginning of history]"), input);
 200         } else {
 201                 edit_->setText(toqstr(h));
 202         }
 203 }
 204
 205
 206 void GuiCommandBuffer::down()
 207 {
 208         string const input = fromqstr(edit_->text());
 209         string const h = historyDown();
 210
 211         if (h.empty()) {
 212         //      show_info_suffix(qt_("[End of history]"), input);
 213         } else {
 214                 edit_->setText(toqstr(h));
 215         }
 216 }
 217
 218
 219 void GuiCommandBuffer::hideParent()
 220 {
 221         view_->setFocus();
 222         edit_->setText(QString());
 223         edit_->clearFocus();
 224         hide();
 225 }
 226
 227
 228 namespace {
 229
 230 class prefix_p {
 231 public:
 232         string p;
 233         prefix_p(string const & s) : p(s) {}
 234         bool operator()(string const & s) const { return prefixIs(s, p); }
 235 };
 236
 237 } // end of anon namespace
 238
 239
 240 string const GuiCommandBuffer::historyUp()
 241 {
 242         if (history_pos_ == history_.begin())
 243                 return string();
 244
 245         return *(--history_pos_);
 246 }
 247
 248
 249 string const GuiCommandBuffer::historyDown()
 250 {
 251         if (history_pos_ == history_.end())
 252                 return string();
 253         if (history_pos_ + 1 == history_.end())
 254                 return string();
 255
 256         return *(++history_pos_);
 257 }
 258
 259
 260 docstring const GuiCommandBuffer::getCurrentState() const
 261 {
 262         return view_->view()->cursor().currentState();
 263 }
 264
 265
 266 void GuiCommandBuffer::hide() const
 267 {
 268         FuncRequest cmd(LFUN_COMMAND_EXECUTE, "off");
 269         theLyXFunc().setLyXView(view_);
 270         lyx::dispatch(cmd);
 271 }
 272
 273
 274 vector<string> const
 275 GuiCommandBuffer::completions(string const & prefix, string & new_prefix)
 276 {
 277         vector<string> comp;
 278
 279         copy_if(commands_.begin(), commands_.end(),
 280                 back_inserter(comp), prefix_p(prefix));
 281
 282         if (comp.empty()) {
 283                 new_prefix = prefix;
 284                 return comp;
 285         }
 286
 287         if (comp.size() == 1) {
 288                 new_prefix = comp[0];
 289                 return vector<string>();
 290         }
 291
 292         // find maximal available prefix
 293         string const tmp = comp[0];
 294         string test = prefix;
 295         if (tmp.length() > test.length())
 296                 test += tmp[test.length()];
 297         while (test.length() < tmp.length()) {
 298                 vector<string> vtmp;
 299                 copy_if(comp.begin(), comp.end(),
 300                         back_inserter(vtmp), prefix_p(test));
 301                 if (vtmp.size() != comp.size()) {
 302                         test.erase(test.length() - 1);
 303                         break;
 304                 }
 305                 test += tmp[test.length()];
 306         }
 307
 308         new_prefix = test;
 309         return comp;
 310 }
 311
 312
 313 void GuiCommandBuffer::dispatch(string const & str)
 314 {
 315         if (str.empty())
 316                 return;
 317
 318         history_.push_back(str);
 319         history_pos_ = history_.end();
 320         FuncRequest func = lyxaction.lookupFunc(str);
 321         func.origin = FuncRequest::COMMANDBUFFER;
 322         theLyXFunc().setLyXView(view_);
 323         lyx::dispatch(func);
 324 }
 325
 326 } // namespace frontend
 327 } // namespace lyx
 328
 329 #include "GuiCommandBuffer_moc.cpp"