GUI: support Ctrl+Plus/Ctrl+Minus to increase or decrease the font size (results and preview)

src/qtgui/guiutils.cpp

@@ -30,6 +30,7 @@
 
 #include <QSettings>
 #include <QStringList>
+#include <QFont>
 
 RclDynConf *g_dynconf;
 AdvSearchHist *g_advshistory;
@@ -200,7 +201,7 @@ void rwSettings(bool writing)
     SETTING_RW(prefs.reslistfontfamily, "/Recoll/prefs/reslist/fontFamily", 
                String, "");
     SETTING_RW(prefs.reslistfontsize, "/Recoll/prefs/reslist/fontSize", Int, 
-               10);
+               QFont().pointSize());
 
     QString rlfDflt = QString::fromUtf8(prefs.dfltResListFormat);
     if (writing) {

src/qtgui/guiutils.h

@@ -49,12 +49,12 @@ public:
     int historysize{0};
     int maxhltextkbs;
     QString reslistfontfamily;
+    int reslistfontsize;
     // Not saved in prefs for now. Computed from qt defaults and used to
     // set main character color for webkit/textbrowser reslist and
     // snippets window.
     QString fontcolor; 
     QString qtermstyle; // CSS style for query terms in reslist and other places
-    int reslistfontsize;
     // Result list format string
     QString reslistformat;
     string  creslistformat;

src/qtgui/preview_w.cpp

@@ -123,11 +123,20 @@ void Preview::init()
         resize(QSize(640, 480).expandedTo(minimumSizeHint()));
     }
 
+    if (prefs.reslistfontfamily != "") {
+        m_font = QFont(prefs.reslistfontfamily, prefs.reslistfontsize);
+    } else {
+        m_font = QFont();
+        m_font.setPointSize(prefs.reslistfontsize);
+    }
+
     (void)new HelpClient(this);
     HelpClient::installMap((const char *)objectName().toUtf8(), 
                            "RCL.SEARCH.GUI.PREVIEW");
 
     // signals and slots connections
+    connect(new QShortcut(QKeySequence::ZoomIn,this), SIGNAL (activated()), this, SLOT (zoomIn()));
+    connect(new QShortcut(QKeySequence::ZoomOut,this),SIGNAL (activated()), this, SLOT (zoomOut()));
     connect(searchTextCMB, SIGNAL(editTextChanged(const QString&)), 
             this, SLOT(searchTextChanged(const QString&)));
     connect(nextPB, SIGNAL(clicked()), this, SLOT(nextPressed()));
@@ -168,6 +177,24 @@ void Preview::onNewShortcuts()
     }
 }
 
+void Preview::zoomIn()
+{
+    m_font.setPointSize(m_font.pointSize()+1);
+    PreviewTextEdit *edit = currentEditor();
+    if (edit) {
+        edit->displayText();
+    }
+}
+
+void Preview::zoomOut()
+{
+    m_font.setPointSize(m_font.pointSize()-1);
+    PreviewTextEdit *edit = currentEditor();
+    if (edit) {
+        edit->displayText();
+    }
+}
+
 void Preview::listShortcuts()
 {
     LISTSHORTCUT(null, "preview:151", tr("Preview Window"),
@@ -806,6 +833,7 @@ bool Preview::loadDocInCurrentTab(const Rcl::Doc &idoc, int docnum)
     }
 #endif
 
+    editor->setFont(m_font);
     editor->setHtml("");
     editor->m_format = Qt::RichText;
     bool inputishtml = !lthr.fdoc.mimetype.compare("text/html");
@@ -1048,10 +1076,27 @@ void PreviewTextEdit::createPopupMenu(const QPoint& pos)
 void PreviewTextEdit::displayText()
 {
     LOGDEB1("PreviewTextEdit::displayText()\n");
+    // Ensuring that the view does not move when changing the font
+    // size and redisplaying the text: can't find a good way to do
+    // it. The only imperfect way I found was to get the position for
+    // the last line (approximately), and make the position visible
+    // after the change.
+    auto c = cursorForPosition(QPoint(0,height()-20));
+    int pos = c.position();
+    // static int lastpos;
+    // std::cerr << "POSITION: " << pos << " DELTA " << pos -lastpos << "\n";
+    // lastpos = pos;
+    setFont(m_preview->m_font);
     if (m_format == Qt::PlainText)
         setPlainText(m_richtxt);
     else
         setHtml(m_richtxt);
+    if (m_curdsp == PTE_DSPTXT) {
+        auto cursor = textCursor();
+        cursor.setPosition(pos);
+        setTextCursor(cursor);
+        ensureCursorVisible();
+    }
     m_curdsp = PTE_DSPTXT;
 }
 
@@ -1060,6 +1105,7 @@ void PreviewTextEdit::displayFields()
 {
     LOGDEB1("PreviewTextEdit::displayFields()\n");
 
+    setFont(m_preview->m_font);
     QString txt = "<html><head></head><body>\n";
     txt += "<b>" + path2qs(m_url);
     if (!m_ipath.empty())
@@ -1080,6 +1126,7 @@ void PreviewTextEdit::displayFields()
 void PreviewTextEdit::displayImage()
 {
     LOGDEB1("PreviewTextEdit::displayImage()\n");
+    setFont(m_preview->m_font);
     if (m_image.isNull())
         displayText();
 

src/qtgui/preview_w.h

@@ -29,8 +29,9 @@
 #include <memory>
 
 #include <QComboBox>
-#include <qvariant.h>
+#include <QVariant>
-#include <qwidget.h>
+#include <QWidget>
+#include <QFont>
 
 #ifdef PREVIEW_TEXTBROWSER
 #include <QTextBrowser>
@@ -164,6 +165,9 @@ public slots:
     virtual void emitEditRequested();
     virtual void togglePlainPre();
     virtual void onNewShortcuts();
+    // Other
+    virtual void zoomIn();
+    virtual void zoomOut();
     
 signals:
     void previewClosed(Preview *);
@@ -190,6 +194,7 @@ private:
     bool          m_loading{false};
     HighlightData m_hData;
     bool          m_justCreated{true}; // First tab create is different
+    QFont         m_font;
     QShortcut *m_closewinsc{nullptr};
     QShortcut *m_nextdocsc{nullptr};
     QShortcut *m_prevdocsc{nullptr};

src/qtgui/rclmain_w.cpp

@@ -288,6 +288,8 @@ void RclMain::init()
     connect(this, SIGNAL(resultsReady()), 
             reslist, SLOT(readDocSource()));
     connect(this, SIGNAL(uiPrefsChanged()), reslist, SLOT(onUiPrefsChanged()));
+    connect(new QShortcut(QKeySequence::ZoomIn,this), SIGNAL (activated()), this, SLOT (zoomIn()));
+    connect(new QShortcut(QKeySequence::ZoomOut,this),SIGNAL (activated()), this, SLOT (zoomOut()));
     
     connect(reslist, SIGNAL(hasResults(int)), 
             this, SLOT(resultCount(int)));
@@ -337,6 +339,17 @@ void RclMain::init()
     periodictimer->start(1000);
 }
 
+void RclMain::zoomIn()
+{
+    prefs.reslistfontsize++;
+    emit uiPrefsChanged();
+}
+void RclMain::zoomOut()
+{
+    prefs.reslistfontsize--;
+    emit uiPrefsChanged();
+}
+
 void RclMain::onNewShortcuts()
 {
     SCBase& scb = SCBase::scBase();

src/qtgui/rclmain_w.h

@@ -168,6 +168,8 @@ public slots:
     virtual void onNewShortcuts();
     virtual void toggleTable();
     virtual void hideToolTip();
+    virtual void zoomIn();
+    virtual void zoomOut();
 
 private slots:
     virtual void updateIdxStatus();

src/qtgui/reslist.cpp

@@ -439,7 +439,7 @@ void ResList::setFont()
 {
 #if defined(USING_WEBKIT) || defined(USING_WEBENGINE)
 #  ifndef SETFONT_WITH_HEADSTYLE
-    if (prefs.reslistfontfamily.length()) {
+    if (prefs.reslistfontfamily != "") {
         // For some reason there is (12-2014) an offset of 3 between what
         // we request from webkit and what we get.
         settings()->setFontSize(QWEBSETTINGS::DefaultFontSize, 
@@ -447,16 +447,18 @@ void ResList::setFont()
         settings()->setFontFamily(QWEBSETTINGS::StandardFont, 
                                   prefs.reslistfontfamily);
     } else {
-        settings()->resetFontSize(QWEBSETTINGS::DefaultFontSize);
+        settings()->setFontSize(QWEBSETTINGS::DefaultFontSize, prefs.reslistfontsize + 3);
         settings()->resetFontFamily(QWEBSETTINGS::StandardFont);
     }
 # endif
 #else
-    if (prefs.reslistfontfamily.length()) {
+    if (prefs.reslistfontfamily != "") {
         QFont nfont(prefs.reslistfontfamily, prefs.reslistfontsize);
         QTextBrowser::setFont(nfont);
     } else {
-        QTextBrowser::setFont(QFont());
+        QFont font;
+        font.setPointSize(prefs.reslistfontsize);
+        QTextBrowser::setFont(font);
     }
 #endif
 }

src/qtgui/restable.cpp

@@ -156,16 +156,18 @@ void ResTableDetailArea::createPopupMenu(const QPoint& pos)
 
 void ResTableDetailArea::setFont()
 {
-    if (prefs.reslistfontsize) {
+    int fs = prefs.reslistfontsize;
-        // fs shows slightly bigger in qtextbrowser? adjust.
+    // fs shows slightly bigger in qtextbrowser? adjust.
-        int fs = prefs.reslistfontsize;
+    if (prefs.reslistfontsize > fsadjustdetail) {
-        if (prefs.reslistfontsize > fsadjustdetail) {
+        fs -= fsadjustdetail;
-            fs -= fsadjustdetail;
+    }
-        }
+    if (prefs.reslistfontfamily != "") {
         QFont nfont(prefs.reslistfontfamily, fs);
         QTextBrowser::setFont(nfont);
     } else {
-        QTextBrowser::setFont(QFont());
+        QFont font;
+        font.setPointSize(fs);
+        QTextBrowser::setFont(font);
     }
 }
 
@@ -807,8 +809,12 @@ void ResTable::toggleVHeader()
 void ResTable::onUiPrefsChanged()
 {
     if (m_detail) {
-        m_detail->init();
+        m_detail->setFont();
     }        
+    // Not sure that this is the right way, but something is needed to
+    // repaint with a possible new font. Toggling alternaterowcolors
+    // works too
+    tableView->update(tableView->indexAt(QPoint(0, 0)));
     if (prefs.noResTableHeader) {
         tableView->horizontalHeader()->hide();
     } else {

src/qtgui/snippets_w.cpp

@@ -142,7 +142,7 @@ void SnippetsW::init()
     browser->setUndoRedoEnabled(false);
     browser->setOpenLinks(false);
     browser->setTabChangesFocus(true);
-    if (prefs.reslistfontfamily.length()) {
+    if (prefs.reslistfontfamily != "") {
         QFont nfont(prefs.reslistfontfamily, prefs.reslistfontsize);
         browser->setFont(nfont);
     } else {

src/qtgui/uiprefs_w.cpp

@@ -627,7 +627,7 @@ void UIPrefsDialog::showSynFileDialog()
 void UIPrefsDialog::resetReslistFont()
 {
     reslistFontFamily = "";
-    reslistFontSize = 0;
+    reslistFontSize = QFont().pointSize();
     setupReslistFontPB();
 }