src/frontends/qt/PanelStack.cpp

   1 /**
   2  * \file PanelStack.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "PanelStack.h"
  14
  15 #include "GuiApplication.h"
  16 #include "GuiFontMetrics.h"
  17 #include "qt_helpers.h"
  18
  19 #include "FancyLineEdit.h"
  20
  21 #include "support/debug.h"
  22 #include "support/lassert.h"
  23
  24 #include <QAbstractButton>
  25 #include <QApplication>
  26 #include <QComboBox>
  27 #include <QGroupBox>
  28 #include <QHideEvent>
  29 #include <QHash>
  30 #include <QHBoxLayout>
  31 #include <QHeaderView>
  32 #include <QLabel>
  33 #include <QLineEdit>
  34 #include <QListWidget>
  35 #include <QPalette>
  36 #include <QPushButton>
  37 #include <QStackedWidget>
  38 #include <QTimer>
  39 #include <QTreeWidget>
  40 #include <QVBoxLayout>
  41
  42 using namespace std;
  43
  44 namespace lyx {
  45 namespace frontend {
  46
  47
  48 PanelStack::PanelStack(QWidget * parent)
  49         : QWidget(parent)
  50 {
  51         delay_search_ = new QTimer(this);
  52         search_ = new FancyLineEdit(this);
  53         list_ = new QTreeWidget(this);
  54         stack_ = new QStackedWidget(this);
  55
  56         // Configure the timer
  57         delay_search_->setSingleShot(true);
  58         connect(delay_search_, SIGNAL(timeout()), this, SLOT(search()));
  59
  60         // Configure tree
  61         list_->setRootIsDecorated(false);
  62         list_->setColumnCount(1);
  63         list_->header()->hide();
  64         list_->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
  65         list_->header()->setStretchLastSection(false);
  66         list_->setMinimumSize(list_->viewport()->size());
  67
  68         connect(list_, SIGNAL(currentItemChanged(QTreeWidgetItem *,
  69                                                  QTreeWidgetItem *)),
  70                 this, SLOT(switchPanel(QTreeWidgetItem *, QTreeWidgetItem *)));
  71         connect(list_, SIGNAL(itemClicked (QTreeWidgetItem*, int)),
  72                 this, SLOT(itemSelected(QTreeWidgetItem *, int)));
  73
  74         // Configure the search box
  75         search_->setPlaceholderText(qt_("Search"));
  76         search_->setClearButton(true);
  77         connect(search_, SIGNAL(rightButtonClicked()),
  78                 this, SLOT(resetSearch()));
  79         connect(search_, SIGNAL(textEdited(QString)),
  80                 this, SLOT(filterChanged(QString)));
  81         connect(search_, SIGNAL(downPressed()),
  82                 list_, SLOT(setFocus()));
  83
  84         // Create the output layout, horizontal plus a VBox on the left with the
  85         // search box and the tree
  86         QVBoxLayout * left_layout = new QVBoxLayout;
  87         left_layout->addWidget(search_, 0);
  88         left_layout->addWidget(list_, 1);
  89
  90         QHBoxLayout * main_layout = new QHBoxLayout(this);
  91         main_layout->addLayout(left_layout, 0);
  92         main_layout->addWidget(stack_, 1);
  93 }
  94
  95
  96 void PanelStack::addCategory(QString const & name, QString const & parent)
  97 {
  98         QTreeWidgetItem * item = nullptr;
  99
 100         LYXERR(Debug::GUI, "addCategory n= " << name << "   parent= ");
 101
 102         int depth = 1;
 103
 104         if (parent.isEmpty()) {
 105                 item = new QTreeWidgetItem(list_);
 106                 item->setText(0, qt_(name));
 107         }
 108         else {
 109                 if (!panel_map_.contains(parent))
 110                         addCategory(parent);
 111                 item = new QTreeWidgetItem(panel_map_.value(parent));
 112                 item->setText(0, qt_(name));
 113                 depth = 2;
 114                 list_->setRootIsDecorated(true);
 115         }
 116
 117         panel_map_[name] = item;
 118
 119         GuiFontMetrics fm(list_->font());
 120
 121         // calculate the real size the current item needs in the listview
 122         int itemsize = fm.width(qt_(name)) + 10 + list_->indentation() * depth;
 123         // adjust the listview width to the max. itemsize
 124         if (itemsize > list_->minimumWidth())
 125                 list_->setMinimumWidth(itemsize);
 126 }
 127
 128
 129 void PanelStack::addPanel(QWidget * panel, QString const & name,
 130                           QString const & parent)
 131 {
 132         addCategory(name, parent);
 133         QTreeWidgetItem * item = panel_map_.value(name);
 134         widget_map_[item] = panel;
 135         stack_->addWidget(panel);
 136         stack_->setMinimumSize(panel->minimumSize());
 137 }
 138
 139
 140 void PanelStack::showPanel(QString const & name, bool show)
 141 {
 142         QTreeWidgetItem * item = panel_map_.value(name, 0);
 143         LASSERT(item, return);
 144
 145         item->setHidden(!show);
 146 }
 147
 148
 149 void PanelStack::setCurrentPanel(QString const & name)
 150 {
 151         QTreeWidgetItem * item = panel_map_.value(name, 0);
 152         LASSERT(item, return);
 153
 154         // force on first set
 155         if (list_->currentItem() == item)
 156                 switchPanel(item);
 157
 158         list_->setCurrentItem(item);
 159 }
 160
 161
 162 bool PanelStack::isCurrentPanel(QString const & name) const
 163 {
 164         QTreeWidgetItem * item = panel_map_.value(name, 0);
 165         LASSERT(item, return false);
 166
 167         return (list_->currentItem() == item);
 168 }
 169
 170
 171 void PanelStack::switchPanel(QTreeWidgetItem * item,
 172                              QTreeWidgetItem * previous)
 173 {
 174         // do nothing when clicked on whitespace (item=NULL)
 175         if (!item)
 176                 return;
 177
 178         // if we have a category, expand the tree and go to the
 179         // first enabled item
 180         if (item->childCount() > 0) {
 181                 item->setExpanded(true);
 182                 if (previous && previous->parent() != item) {
 183                         // Looks for a child not disabled
 184                         for (int i = 0; i < item->childCount(); ++i) {
 185                                 if (item->child(i)->flags() & Qt::ItemIsEnabled) {
 186                                         switchPanel(item->child(i), previous);
 187                                         break;
 188                                 }
 189                         }
 190                 }
 191         }
 192         else if (QWidget * w = widget_map_.value(item, 0)) {
 193                 stack_->setCurrentWidget(w);
 194         }
 195 }
 196
 197 static bool matches(QString const & input, QString const & search)
 198 {
 199         QString text = input;
 200
 201         // Check if the input contains the search string
 202         return text.remove('&').contains(search, Qt::CaseInsensitive);
 203 }
 204
 205 static void setTreeItemStatus(QTreeWidgetItem * tree_item, bool enabled)
 206 {
 207         // Enable/disable the item
 208         tree_item->setDisabled(!enabled);
 209
 210         // Change the color from black to gray or viceversa
 211         QPalette::ColorGroup new_color =
 212                 enabled ? QPalette::Active : QPalette::Disabled;
 213         tree_item->setForeground(0, QApplication::palette().color(new_color,
 214                                                                  QPalette::Text));
 215 }
 216
 217 void PanelStack::hideEvent(QHideEvent * event)
 218 {
 219         QWidget::hideEvent(event);
 220
 221         // Programmatically hidden (not simply minimized by the user)
 222         if (!event->spontaneous()) {
 223                 resetSearch();
 224         }
 225 }
 226
 227 void PanelStack::resetSearch()
 228 {
 229         search_->setText(QString());
 230         search();
 231 }
 232
 233 void PanelStack::filterChanged(QString const & /*search*/)
 234 {
 235         // The text in the search box is changed, reset the timer
 236         // and then search in the widgets
 237         delay_search_->start(300);
 238 }
 239
 240 void PanelStack::search()
 241 {
 242         QString search = search_->text();
 243         bool enable_all = search.isEmpty();
 244
 245         // If the search string is empty we enable all the items
 246         // otherwise we disable everything and then selectively
 247         // re-enable matching items
 248         for (QTreeWidgetItem * tree_item : panel_map_) {
 249                 setTreeItemStatus(tree_item, enable_all);
 250         }
 251
 252         for (QTreeWidgetItem * tree_item : panel_map_) {
 253                 // Current widget
 254                 QWidget * pane_widget = widget_map_[tree_item];
 255
 256                 // First of all we look in the pane name
 257                 bool pane_matches = tree_item->text(0).contains(search,
 258                                                                 Qt::CaseInsensitive);
 259
 260                 // If the tree item has an associated pane
 261                 if (pane_widget) {
 262                         // Loops on the list of children widgets (recursive)
 263                         QWidgetList children = pane_widget->findChildren<QWidget *>();
 264                         for (QWidget * child_widget : children) {
 265                                 bool widget_matches = false;
 266
 267                                 // Try to cast to the most common widgets and looks in it's
 268                                 // content.
 269                                 // It's bad OOP, it would be nice to have a QWidget::toString()
 270                                 // overloaded by each widget, but this would require to change
 271                                 // Qt or subclass each widget.
 272                                 // Note that we have to ignore the amperstand symbol
 273                                 if (QAbstractButton * button =
 274                                     qobject_cast<QAbstractButton *>(child_widget)) {
 275                                         widget_matches = matches(button->text(), search);
 276
 277                                 } else if (QGroupBox * group_box =
 278                                            qobject_cast<QGroupBox *>(child_widget)) {
 279                                         widget_matches = matches(group_box->title(), search);
 280
 281                                 } else if (QLabel * label =
 282                                            qobject_cast<QLabel *>(child_widget)) {
 283                                         widget_matches = matches(label->text(), search);
 284
 285                                 } else if (QLineEdit * line_edit =
 286                                            qobject_cast<QLineEdit *>(child_widget)) {
 287                                         widget_matches = matches(line_edit->text(), search);
 288
 289                                 } else if (QListWidget * list_widget =
 290                                            qobject_cast<QListWidget *>(child_widget)) {
 291                                         widget_matches =
 292                                                 list_widget->findItems(search,
 293                                                                        Qt::MatchContains).count() > 0;
 294
 295                                 } else if (QTreeWidget * tree_view =
 296                                            qobject_cast<QTreeWidget *>(child_widget)) {
 297                                         widget_matches =
 298                                                 tree_view->findItems(search,
 299                                                                      Qt::MatchContains).count() > 0;
 300
 301                                 } else if (QComboBox * combo_box =
 302                                            qobject_cast<QComboBox *>(child_widget)) {
 303                                         widget_matches =
 304                                                 combo_box->findText(search,
 305                                                                     Qt::MatchContains) != -1;
 306
 307                                 } else {
 308                                         continue;
 309                                 }
 310
 311                                 // If this widget meets the search criteria
 312                                 if (widget_matches && !enable_all) {
 313                                         // The pane too meets the search criteria
 314                                         pane_matches = true;
 315
 316                                         // Highlight the widget
 317                                         QPalette widget_palette = child_widget->palette();
 318                                         widget_palette.setColor(child_widget->foregroundRole(),
 319                                                                 Qt::red);
 320                                         child_widget->setPalette(widget_palette);
 321                                 } else {
 322                                         // Reset the color of the widget
 323                                         child_widget->setPalette(QApplication::palette(child_widget));
 324                                 }
 325                         }
 326
 327                         // If the pane meets the search criteria
 328                         if (pane_matches && !enable_all) {
 329                                 // Expand and enable the pane and his ancestors (typically just
 330                                 // the parent)
 331                                 QTreeWidgetItem * item = tree_item;
 332                                 do {
 333                                         item->setExpanded(true);
 334                                         setTreeItemStatus(item, true);
 335                                         item = item->parent();
 336                                 } while (item);
 337                         }
 338                 }
 339
 340         }
 341 }
 342
 343 void PanelStack::itemSelected(QTreeWidgetItem * item, int)
 344 {
 345         // de-select the category if a child is selected
 346         if (item->childCount() > 0 && item->child(0)->isSelected())
 347                 item->setSelected(false);
 348 }
 349
 350
 351 QSize PanelStack::sizeHint() const
 352 {
 353         return QSize(list_->width() + stack_->width(),
 354                 qMax(list_->height(), stack_->height()));
 355 }
 356
 357 } // namespace frontend
 358 } // namespace lyx
 359
 360 #include "moc_PanelStack.cpp"