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 "GuiView.h"
  16
  17 #include "GuiCommandBuffer.h"
  18 #include "GuiCommandEdit.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 "frontends/LyXView.h"
  28
  29 #include "support/lyxalgo.h"
  30 #include "support/lstrings.h"
  31
  32 #include <QHBoxLayout>
  33 #include <QKeyEvent>
  34 #include <QLayout>
  35 #include <QListWidget>
  36 #include <QMouseEvent>
  37 #include <QPixmap>
  38 #include <QPushButton>
  39 #include <QToolTip>
  40 #include <QVBoxLayout>
  41
  42 using std::back_inserter;
  43 using std::transform;
  44 using std::string;
  45 using std::vector;
  46
  47
  48 namespace lyx {
  49 namespace frontend {
  50
  51 using support::prefixIs;
  52
  53
  54 namespace {
  55
  56 class QTempListBox : public QListWidget {
  57 public:
  58         QTempListBox() {
  59                 //setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  60                 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  61                 setWindowModality(Qt::WindowModal);
  62                 setWindowFlags(Qt::Popup);
  63                 setAttribute(Qt::WA_DeleteOnClose);
  64         }
  65 protected:
  66         void mouseReleaseEvent(QMouseEvent * ev) {
  67                 if (ev->x() < 0 || ev->y() < 0
  68                     || ev->x() > width() || ev->y() > height()) {
  69                         hide();
  70                 } else {
  71                         // emit signal
  72                         itemPressed(currentItem());
  73                 }
  74         }
  75
  76         void keyPressEvent(QKeyEvent * ev) {
  77                 if (ev->key() == Qt::Key_Escape) {
  78                         hide();
  79                         return;
  80                 } else if (ev->key() == Qt::Key_Return || ev->key() == Qt::Key_Space) {
  81                         // emit signal
  82                         itemPressed(currentItem());
  83                 } else
  84                         QListWidget::keyPressEvent(ev);
  85         }
  86 };
  87
  88 } // end of anon
  89
  90
  91 GuiCommandBuffer::GuiCommandBuffer(GuiView * view)
  92         : view_(view), lv_(*view), history_pos_(history_.end())
  93 {
  94         transform(lyxaction.func_begin(), lyxaction.func_end(),
  95                 back_inserter(commands_), firster());
  96
  97         QPixmap qpup(":/images/up.png");
  98         QPixmap qpdown(":/images/down.png");
  99
 100         QVBoxLayout * top = new QVBoxLayout(this);
 101         QHBoxLayout * layout = new QHBoxLayout(0);
 102
 103         QPushButton * up = new QPushButton(qpup, "", this);
 104         up->setMaximumSize(24, 24);
 105         QPushButton * down = new QPushButton(qpdown, "", this);
 106         down->setToolTip(qt_("Next command"));
 107         down->setMaximumSize(24, 24);
 108         connect(down, SIGNAL(clicked()), this, SLOT(down()));
 109
 110         edit_ = new GuiCommandEdit(this);
 111         edit_->setMinimumSize(edit_->sizeHint());
 112         edit_->setFocusPolicy(Qt::ClickFocus);
 113
 114         connect(edit_, SIGNAL(escapePressed()), this, SLOT(cancel()));
 115         connect(edit_, SIGNAL(returnPressed()), this, SLOT(dispatch()));
 116         connect(edit_, SIGNAL(tabPressed()), this, SLOT(complete()));
 117         connect(edit_, SIGNAL(upPressed()), this, SLOT(up()));
 118         connect(edit_, SIGNAL(downPressed()), this, SLOT(down()));
 119         connect(edit_, SIGNAL(hidePressed()), this, SLOT(hideParent()));
 120
 121         layout->addWidget(up, 0);
 122         layout->addWidget(down, 0);
 123         layout->addWidget(edit_, 10);
 124         layout->setMargin(0);
 125         top->addLayout(layout);
 126         top->setMargin(0);
 127         setFocusProxy(edit_);
 128 }
 129
 130
 131 void GuiCommandBuffer::cancel()
 132 {
 133         view_->setFocus();
 134         edit_->setText(QString());
 135 }
 136
 137
 138 void GuiCommandBuffer::dispatch()
 139 {
 140         dispatch(fromqstr(edit_->text()));
 141         view_->setFocus();
 142         edit_->setText(QString());
 143         edit_->clearFocus();
 144 }
 145
 146
 147 void GuiCommandBuffer::complete()
 148 {
 149         string const input = fromqstr(edit_->text());
 150         string new_input;
 151         vector<string> comp = completions(input, new_input);
 152
 153         if (comp.empty() && new_input == input) {
 154                 // show_info_suffix(qt_("[no match]"), input);
 155                 return;
 156         }
 157
 158         if (comp.empty()) {
 159                 edit_->setText(toqstr(new_input));
 160         //      show_info_suffix(("[only completion]"), new_input + ' ');
 161                 return;
 162         }
 163
 164         edit_->setText(toqstr(new_input));
 165
 166         QTempListBox * list = new QTempListBox;
 167
 168         // For some reason the scrollview's contents are larger
 169         // than the number of actual items...
 170         vector<string>::const_iterator cit = comp.begin();
 171         vector<string>::const_iterator end = comp.end();
 172         for (; cit != end; ++cit)
 173                 list->addItem(toqstr(*cit));
 174
 175         list->resize(list->sizeHint());
 176         QPoint const pos = edit_->mapToGlobal(QPoint(0, 0));
 177
 178         int const y = std::max(0, pos.y() - list->height());
 179
 180         list->move(pos.x(), y);
 181
 182         connect(list, SIGNAL(itemPressed(QListWidgetItem *)),
 183                 this, SLOT(complete_selected(QListWidgetItem *)));
 184         connect(list, SIGNAL(itemActivated(QListWidgetItem *)),
 185                 this, SLOT(complete_selected(QListWidgetItem *)));
 186
 187         list->show();
 188         list->setFocus();
 189 }
 190
 191
 192 void GuiCommandBuffer::complete_selected(QListWidgetItem * item)
 193 {
 194         QWidget const * widget = static_cast<QWidget const *>(sender());
 195         const_cast<QWidget *>(widget)->hide();
 196         edit_->setText(item->text() + ' ');
 197         edit_->activateWindow();
 198         edit_->setFocus();
 199 }
 200
 201
 202 void GuiCommandBuffer::up()
 203 {
 204         string const input = fromqstr(edit_->text());
 205         string const h = historyUp();
 206
 207         if (h.empty()) {
 208         //      show_info_suffix(qt_("[Beginning of history]"), input);
 209         } else {
 210                 edit_->setText(toqstr(h));
 211         }
 212 }
 213
 214
 215 void GuiCommandBuffer::down()
 216 {
 217         string const input = fromqstr(edit_->text());
 218         string const h = historyDown();
 219
 220         if (h.empty()) {
 221         //      show_info_suffix(qt_("[End of history]"), input);
 222         } else {
 223                 edit_->setText(toqstr(h));
 224         }
 225 }
 226
 227
 228 void GuiCommandBuffer::hideParent()
 229 {
 230         view_->setFocus();
 231         edit_->setText(QString());
 232         edit_->clearFocus();
 233         hide();
 234 }
 235
 236
 237 namespace {
 238
 239 class prefix_p {
 240 public:
 241         string p;
 242         prefix_p(string const & s) : p(s) {}
 243         bool operator()(string const & s) const { return prefixIs(s, p); }
 244 };
 245
 246 } // end of anon namespace
 247
 248
 249 string const GuiCommandBuffer::historyUp()
 250 {
 251         if (history_pos_ == history_.begin())
 252                 return string();
 253
 254         return *(--history_pos_);
 255 }
 256
 257
 258 string const GuiCommandBuffer::historyDown()
 259 {
 260         if (history_pos_ == history_.end())
 261                 return string();
 262         if (history_pos_ + 1 == history_.end())
 263                 return string();
 264
 265         return *(++history_pos_);
 266 }
 267
 268
 269 docstring const GuiCommandBuffer::getCurrentState() const
 270 {
 271         return lv_.view()->cursor().currentState();
 272 }
 273
 274
 275 void GuiCommandBuffer::hide() const
 276 {
 277         lv_.showMiniBuffer(false);
 278 }
 279
 280
 281 vector<string> const
 282 GuiCommandBuffer::completions(string const & prefix, string & new_prefix)
 283 {
 284         vector<string> comp;
 285
 286         copy_if(commands_.begin(), commands_.end(),
 287                 back_inserter(comp), prefix_p(prefix));
 288
 289         if (comp.empty()) {
 290                 new_prefix = prefix;
 291                 return comp;
 292         }
 293
 294         if (comp.size() == 1) {
 295                 new_prefix = comp[0];
 296                 return vector<string>();
 297         }
 298
 299         // find maximal available prefix
 300         string const tmp = comp[0];
 301         string test = prefix;
 302         if (tmp.length() > test.length())
 303                 test += tmp[test.length()];
 304         while (test.length() < tmp.length()) {
 305                 vector<string> vtmp;
 306                 copy_if(comp.begin(), comp.end(),
 307                         back_inserter(vtmp), prefix_p(test));
 308                 if (vtmp.size() != comp.size()) {
 309                         test.erase(test.length() - 1);
 310                         break;
 311                 }
 312                 test += tmp[test.length()];
 313         }
 314
 315         new_prefix = test;
 316         return comp;
 317 }
 318
 319
 320 void GuiCommandBuffer::dispatch(string const & str)
 321 {
 322         if (str.empty())
 323                 return;
 324
 325         history_.push_back(str);
 326         history_pos_ = history_.end();
 327         FuncRequest func = lyxaction.lookupFunc(str);
 328         func.origin = FuncRequest::COMMANDBUFFER;
 329         lv_.dispatch(func);
 330 }
 331
 332 } // namespace frontend
 333 } // namespace lyx
 334
 335 #include "GuiCommandBuffer_moc.cpp"