Tool for simple text search

PdfForQtLib/PdfForQtLib.pro

@@ -57,6 +57,7 @@ SOURCES += \
     sources/pdfsecurityhandler.cpp \
     sources/pdftextlayout.cpp \
     sources/pdfutils.cpp \
+    sources/pdfwidgettool.cpp \
     sources/pdfxreftable.cpp \
     sources/pdfvisitor.cpp \
     sources/pdfencoding.cpp \
@@ -100,6 +101,7 @@ HEADERS += \
     sources/pdfprogress.h \
     sources/pdfsecurityhandler.h \
     sources/pdftextlayout.h \
+    sources/pdfwidgettool.h \
     sources/pdfxreftable.h \
     sources/pdfflatmap.h \
     sources/pdfvisitor.h \

PdfForQtLib/sources/pdfdrawspacecontroller.h

@@ -35,6 +35,7 @@ namespace pdf
 class PDFProgress;
 class PDFWidget;
 class IDrawWidget;
+class PDFWidgetTool;
 class PDFCMSManager;
 class PDFTextLayoutGetter;
 class PDFAsynchronousPageCompiler;
@@ -298,6 +299,7 @@ public:
     PDFProgress* getProgress() const { return m_progress; }
     void setProgress(PDFProgress* progress) { m_progress = progress; }
     PDFAsynchronousTextLayoutCompiler* getTextLayoutCompiler() const { return m_textLayoutCompiler; }
+    PDFWidget* getWidget() const { return m_widget; }
 
     void setFeatures(PDFRenderer::Features features);
     void setPreferredMeshResolutionRatio(PDFReal ratio);

PdfForQtLib/sources/pdfwidgettool.cpp

@@ -0,0 +1,417 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfwidgettool.h"
+#include "pdfdrawwidget.h"
+#include "pdfcompiler.h"
+
+#include <QLabel>
+#include <QAction>
+#include <QCheckBox>
+#include <QLineEdit>
+#include <QGridLayout>
+#include <QPushButton>
+
+namespace pdf
+{
+
+PDFWidgetTool::PDFWidgetTool(PDFDrawWidgetProxy* proxy, QObject* parent) :
+    BaseClass(parent),
+    m_active(false),
+    m_document(nullptr),
+    m_proxy(proxy)
+{
+
+}
+
+PDFWidgetTool::~PDFWidgetTool()
+{
+
+}
+
+void PDFWidgetTool::drawPage(QPainter* painter,
+                             PDFInteger pageIndex,
+                             const PDFPrecompiledPage* compiledPage,
+                             PDFTextLayoutGetter& layoutGetter,
+                             const QMatrix& pagePointToDevicePointMatrix) const
+{
+    for (PDFWidgetTool* tool : m_toolStack)
+    {
+        tool->drawPage(painter, pageIndex, compiledPage, layoutGetter, pagePointToDevicePointMatrix);
+    }
+}
+
+void PDFWidgetTool::setDocument(const PDFDocument* document)
+{
+    if (m_document != document)
+    {
+        // We must turn off the tool, if we are changing the document
+        setActive(false);
+        m_document = document;
+    }
+}
+
+void PDFWidgetTool::setActive(bool active)
+{
+    if (m_active != active)
+    {
+        m_active = active;
+
+        if (active)
+        {
+            m_proxy->registerDrawInterface(this);
+        }
+        else
+        {
+            m_proxy->unregisterDrawInterface(this);
+        }
+
+        setActiveImpl(active);
+
+        m_proxy->repaintNeeded();
+        emit toolActivityChanged(active);
+    }
+}
+
+void PDFWidgetTool::setActiveImpl(bool active)
+{
+    Q_UNUSED(active);
+}
+
+PDFFindTextTool::PDFFindTextTool(PDFDrawWidgetProxy* proxy, QAction* prevAction, QAction* nextAction, QObject* parent, QWidget* parentDialog) :
+    BaseClass(proxy, parent),
+    m_prevAction(prevAction),
+    m_nextAction(nextAction),
+    m_dialog(nullptr),
+    m_parentDialog(parentDialog),
+    m_caseSensitiveCheckBox(nullptr),
+    m_wholeWordsCheckBox(nullptr),
+    m_findTextEdit(nullptr),
+    m_previousButton(nullptr),
+    m_nextButton(nullptr),
+    m_selectedResultIndex(0)
+{
+    PDFAsynchronousTextLayoutCompiler* compiler = getProxy()->getTextLayoutCompiler();
+    connect(compiler, &PDFAsynchronousTextLayoutCompiler::textLayoutChanged, this, &PDFFindTextTool::performSearch);
+    connect(m_prevAction, &QAction::triggered, this, &PDFFindTextTool::onActionPrevious);
+    connect(m_nextAction, &QAction::triggered, this, &PDFFindTextTool::onActionNext);
+
+    updateActions();
+}
+
+void PDFFindTextTool::drawPage(QPainter* painter,
+                               PDFInteger pageIndex,
+                               const PDFPrecompiledPage* compiledPage,
+                               PDFTextLayoutGetter& layoutGetter,
+                               const QMatrix& pagePointToDevicePointMatrix) const
+{
+    Q_UNUSED(compiledPage);
+
+    const pdf::PDFTextSelection& textSelection = getTextSelection();
+    pdf::PDFTextSelectionPainter textSelectionPainter(&textSelection);
+    textSelectionPainter.draw(painter, pageIndex, layoutGetter, pagePointToDevicePointMatrix);
+}
+
+void PDFFindTextTool::clearResults()
+{
+    m_findResults.clear();
+    m_selectedResultIndex = 0;
+    m_textSelection.dirty();
+}
+
+void PDFFindTextTool::setActiveImpl(bool active)
+{
+    if (active)
+    {
+        Q_ASSERT(!m_dialog);
+
+        // For find, we will need text layout
+        getProxy()->getTextLayoutCompiler()->makeTextLayout();
+
+        // Create dialog
+        m_dialog = new QDialog(m_parentDialog, Qt::Tool);
+        m_dialog->setWindowTitle(tr("Find"));
+
+        QGridLayout* layout = new QGridLayout(m_dialog);
+        m_dialog->setLayout(layout);
+
+        // Jakub Melka: we will create following widgets:
+        //  - text with label
+        //  - line edit, where user can enter search text
+        //  - 2 checkbox for settings
+        //  - 2 push buttons (previous/next)
+
+        m_findTextEdit = new QLineEdit(m_dialog);
+        m_caseSensitiveCheckBox = new QCheckBox(tr("Case sensitive"), m_dialog);
+        m_wholeWordsCheckBox = new QCheckBox(tr("Whole words only"), m_dialog);
+        m_previousButton = new QPushButton(tr("Previous"), m_dialog);
+        m_nextButton = new QPushButton(tr("Next"), m_dialog);
+
+        connect(m_previousButton, &QPushButton::clicked, m_prevAction, &QAction::trigger);
+        connect(m_nextButton, &QPushButton::clicked, m_nextAction, &QAction::trigger);
+        connect(m_findTextEdit, &QLineEdit::editingFinished, this, &PDFFindTextTool::onSearchText);
+        connect(m_caseSensitiveCheckBox, &QCheckBox::clicked, this, &PDFFindTextTool::onSearchText);
+        connect(m_wholeWordsCheckBox, &QCheckBox::clicked, this, &PDFFindTextTool::onSearchText);
+
+        layout->addWidget(new QLabel(tr("Search text"), m_dialog), 0, 0, 1, -1, Qt::AlignLeft);
+        layout->addWidget(m_findTextEdit, 1, 0, 1, -1);
+        layout->addWidget(m_caseSensitiveCheckBox, 2, 0, 1, -1, Qt::AlignLeft);
+        layout->addWidget(m_wholeWordsCheckBox, 3, 0, 1, -1, Qt::AlignLeft);
+        layout->addWidget(m_previousButton, 4, 0);
+        layout->addWidget(m_nextButton, 4, 1);
+        m_dialog->setFixedSize(m_dialog->sizeHint());
+
+        PDFWidget* widget = getProxy()->getWidget();
+        QPoint topRight = widget->mapToGlobal(widget->rect().topRight());
+        QPoint topRightParent = m_parentDialog->mapFromGlobal(topRight);
+
+        m_dialog->show();
+        m_dialog->move(topRightParent - QPoint(m_dialog->width() * 1.1, 0));
+        connect(m_dialog, &QDialog::rejected, this, [this] { setActive(false); });
+    }
+    else
+    {
+        Q_ASSERT(m_dialog);
+        m_dialog->deleteLater();
+        m_dialog = nullptr;
+        m_caseSensitiveCheckBox = nullptr;
+        m_wholeWordsCheckBox = nullptr;
+        m_findTextEdit = nullptr;
+        m_previousButton = nullptr;
+        m_nextButton = nullptr;
+
+        clearResults();
+    }
+}
+
+void PDFFindTextTool::onSearchText()
+{
+    m_parameters.phrase = m_findTextEdit->text();
+    m_parameters.isCaseSensitive = m_caseSensitiveCheckBox->isChecked();
+    m_parameters.isWholeWordsOnly = m_wholeWordsCheckBox->isChecked();
+    m_parameters.isSearchFinished = m_parameters.phrase.isEmpty();
+
+    m_findResults.clear();
+    m_textSelection.dirty();
+    updateResultsUI();
+
+    if (m_parameters.isSearchFinished)
+    {
+        // We have nothing to search for
+        return;
+    }
+
+    pdf::PDFAsynchronousTextLayoutCompiler* compiler = getProxy()->getTextLayoutCompiler();
+    if (compiler->isTextLayoutReady())
+    {
+        performSearch();
+    }
+    else
+    {
+        compiler->makeTextLayout();
+    }
+}
+
+void PDFFindTextTool::onActionPrevious()
+{
+    if (!m_findResults.empty())
+    {
+        if (m_selectedResultIndex == 0)
+        {
+            m_selectedResultIndex = m_findResults.size() - 1;
+        }
+        else
+        {
+            --m_selectedResultIndex;
+        }
+        m_textSelection.dirty();
+        getProxy()->repaintNeeded();
+        getProxy()->goToPage(m_findResults[m_selectedResultIndex].textSelectionItems.front().first.pageIndex);
+        updateTitle();
+    }
+}
+
+void PDFFindTextTool::onActionNext()
+{
+    if (!m_findResults.empty())
+    {
+        m_selectedResultIndex = (m_selectedResultIndex + 1) % m_findResults.size();
+        m_textSelection.dirty();
+        getProxy()->repaintNeeded();
+        getProxy()->goToPage(m_findResults[m_selectedResultIndex].textSelectionItems.front().first.pageIndex);
+        updateTitle();
+    }
+}
+
+void PDFFindTextTool::performSearch()
+{
+    if (m_parameters.isSearchFinished)
+    {
+        return;
+    }
+
+    clearResults();
+    m_parameters.isSearchFinished = true;
+
+    if (m_parameters.phrase.isEmpty())
+    {
+        return;
+    }
+
+    PDFAsynchronousTextLayoutCompiler* compiler = getProxy()->getTextLayoutCompiler();
+    if (!compiler->isTextLayoutReady())
+    {
+        // Text layout is not ready yet
+        return;
+    }
+
+    // Prepare string to search
+    QString expression = m_parameters.phrase;
+
+    bool useRegularExpression = false;
+    if (m_parameters.isWholeWordsOnly)
+    {
+        expression = QString("\\b%1\\b").arg(QRegularExpression::escape(expression));
+        useRegularExpression = true;
+    }
+
+    pdf::PDFTextFlow::FlowFlags flowFlags = pdf::PDFTextFlow::SeparateBlocks;
+
+    const pdf::PDFTextLayoutStorage* textLayoutStorage = compiler->getTextLayoutStorage();
+    if (!useRegularExpression)
+    {
+        // Use simple text search
+        Qt::CaseSensitivity caseSensitivity = m_parameters.isCaseSensitive ? Qt::CaseSensitive : Qt::CaseInsensitive;
+        m_findResults = textLayoutStorage->find(expression, caseSensitivity, flowFlags);
+    }
+    else
+    {
+        // Use regular expression search
+        QRegularExpression::PatternOptions patternOptions = QRegularExpression::UseUnicodePropertiesOption | QRegularExpression::OptimizeOnFirstUsageOption;
+        if (!m_parameters.isCaseSensitive)
+        {
+            patternOptions |= QRegularExpression::CaseInsensitiveOption;
+        }
+
+        QRegularExpression regularExpression(expression, patternOptions);
+        m_findResults = textLayoutStorage->find(regularExpression, flowFlags);
+    }
+
+    std::sort(m_findResults.begin(), m_findResults.end());
+    m_selectedResultIndex = 0;
+    m_textSelection.dirty();
+    getProxy()->repaintNeeded();
+
+    updateResultsUI();
+}
+
+void PDFFindTextTool::updateActions()
+{
+    const bool isActive = this->isActive();
+    const bool hasResults = !m_findResults.empty();
+    const bool enablePrevious = isActive && hasResults;
+    const bool enableNext = isActive && hasResults;
+
+    m_prevAction->setEnabled(enablePrevious);
+    m_nextAction->setEnabled(enableNext);
+}
+
+void PDFFindTextTool::updateResultsUI()
+{
+    m_selectedResultIndex = qBound(size_t(0), m_selectedResultIndex, m_findResults.size());
+
+    updateActions();
+    updateTitle();
+}
+
+void PDFFindTextTool::updateTitle()
+{
+    if (!m_dialog)
+    {
+        return;
+    }
+
+    if (m_findResults.empty())
+    {
+        m_dialog->setWindowTitle(tr("Find"));
+    }
+    else
+    {
+        m_dialog->setWindowTitle(tr("Find (%1/%2)").arg(m_selectedResultIndex + 1).arg(m_findResults.size()));
+    }
+}
+
+PDFTextSelection PDFFindTextTool::getTextSelectionImpl() const
+{
+    pdf::PDFTextSelection result;
+
+    for (size_t i = 0; i < m_findResults.size(); ++i)
+    {
+        const pdf::PDFFindResult& findResult = m_findResults[i];
+
+        QColor color(Qt::blue);
+        if (i == m_selectedResultIndex)
+        {
+            color = QColor(Qt::yellow);
+        }
+
+        result.addItems(findResult.textSelectionItems, color);
+    }
+    result.build();
+
+    return result;
+}
+
+PDFToolManager::PDFToolManager(PDFDrawWidgetProxy* proxy, QAction* findPreviousAction, QAction* findNextAction, QObject* parent, QWidget* parentDialog) :
+    BaseClass(parent),
+    m_predefinedTools()
+{
+    m_predefinedTools[FindTextTool] = new PDFFindTextTool(proxy, findPreviousAction, findNextAction, this, parentDialog);
+
+    for (PDFWidgetTool* tool : m_predefinedTools)
+    {
+        m_tools.insert(tool);
+    }
+}
+
+void PDFToolManager::setDocument(const PDFDocument* document)
+{
+    for (PDFWidgetTool* tool : m_tools)
+    {
+        tool->setDocument(document);
+    }
+}
+
+PDFWidgetTool* PDFToolManager::getActiveTool() const
+{
+    for (PDFWidgetTool* tool : m_tools)
+    {
+        if (tool->isActive())
+        {
+            return tool;
+        }
+    }
+
+    return nullptr;
+}
+
+PDFFindTextTool* PDFToolManager::getFindTextTool() const
+{
+    return qobject_cast<PDFFindTextTool*>(m_predefinedTools[FindTextTool]);
+}
+
+}   // namespace pdf

PdfForQtLib/sources/pdfwidgettool.h

@@ -0,0 +1,188 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFWIDGETTOOL_H
+#define PDFWIDGETTOOL_H
+
+#include "pdfdrawspacecontroller.h"
+#include "pdftextlayout.h"
+
+#include <QDialog>
+
+class QCheckBox;
+
+namespace pdf
+{
+
+/// Base class for various widget tools (for example, searching, text selection,
+/// screenshots, zoom tool etc.). Each tool can have subtools (for example,
+/// screenshot tool is picking screenshot rectangle).
+class PDFFORQTLIBSHARED_EXPORT PDFWidgetTool : public QObject, public IDocumentDrawInterface
+{
+    Q_OBJECT
+
+private:
+    using BaseClass = QObject;
+
+public:
+    explicit PDFWidgetTool(PDFDrawWidgetProxy* proxy, QObject* parent);
+    virtual ~PDFWidgetTool();
+
+    virtual void drawPage(QPainter* painter,
+                          PDFInteger pageIndex,
+                          const PDFPrecompiledPage* compiledPage,
+                          PDFTextLayoutGetter& layoutGetter,
+                          const QMatrix& pagePointToDevicePointMatrix) const override;
+
+    /// Sets document, shuts down the tool, if it is active, and document
+    /// is changing.
+    /// \param document Document
+    void setDocument(const PDFDocument* document);
+
+    /// Sets tool as active or inactive. If tool is active, then it is processed
+    /// in draw widget proxy events (such as drawing etc.).
+    /// \param active Is tool active?
+    void setActive(bool active);
+
+    /// Returns true, if tool is active
+    bool isActive() const { return m_active; }
+
+signals:
+    void toolActivityChanged(bool active);
+
+protected:
+    virtual void setActiveImpl(bool active);
+
+    PDFDrawWidgetProxy* getProxy() const { return m_proxy; }
+
+private:
+    bool m_active;
+    const PDFDocument* m_document;
+    PDFDrawWidgetProxy* m_proxy;
+    std::vector<PDFWidgetTool*> m_toolStack;
+};
+
+/// Simple tool for find text in PDF document. It is much simpler than advanced
+/// search and can't search using regular expressions.
+class PDFFORQTLIBSHARED_EXPORT PDFFindTextTool : public PDFWidgetTool
+{
+    Q_OBJECT
+
+private:
+    using BaseClass = PDFWidgetTool;
+
+public:
+    /// Construct new text search tool
+    /// \param proxy Draw widget proxy
+    /// \param prevAction Action for navigating to previous result
+    /// \param nextAction Action for navigating to next result
+    /// \param parent Parent object
+    /// \param parentDialog Paret dialog for tool dialog
+    explicit PDFFindTextTool(PDFDrawWidgetProxy* proxy, QAction* prevAction, QAction* nextAction, QObject* parent, QWidget* parentDialog);
+
+    virtual void drawPage(QPainter* painter,
+                          PDFInteger pageIndex,
+                          const PDFPrecompiledPage* compiledPage,
+                          PDFTextLayoutGetter& layoutGetter,
+                          const QMatrix& pagePointToDevicePointMatrix) const override;
+
+protected:
+    virtual void setActiveImpl(bool active) override;
+
+private:
+    void onSearchText();
+    void onActionPrevious();
+    void onActionNext();
+
+    void performSearch();
+    void updateActions();
+    void updateResultsUI();
+    void updateTitle();
+    void clearResults();
+
+    QAction* m_prevAction;
+    QAction* m_nextAction;
+    QWidget* m_parentDialog;
+
+    QDialog* m_dialog;
+    QCheckBox* m_caseSensitiveCheckBox;
+    QCheckBox* m_wholeWordsCheckBox;
+    QLineEdit* m_findTextEdit;
+    QPushButton* m_previousButton;
+    QPushButton* m_nextButton;
+
+    pdf::PDFTextSelection getTextSelection() const { return m_textSelection.get(this, &PDFFindTextTool::getTextSelectionImpl); }
+    pdf::PDFTextSelection getTextSelectionImpl() const;
+
+    struct SearchParameters
+    {
+        QString phrase;
+        bool isCaseSensitive = false;
+        bool isWholeWordsOnly = false;
+        bool isSearchFinished = false;
+    };
+
+    SearchParameters m_parameters;
+    pdf::PDFFindResults m_findResults;
+    size_t m_selectedResultIndex;
+    mutable pdf::PDFCachedItem<pdf::PDFTextSelection> m_textSelection;
+};
+
+/// Manager used for managing tools, their activity, availability
+/// and other settings. It also defines a predefined set of tools,
+/// available for various purposes (text searching, magnifier tool etc.)
+class PDFFORQTLIBSHARED_EXPORT PDFToolManager : public QObject
+{
+    Q_OBJECT
+
+private:
+    using BaseClass = QObject;
+
+public:
+    /// Construct new text search tool
+    /// \param proxy Draw widget proxy
+    /// \param prevAction Action for navigating to previous result
+    /// \param nextAction Action for navigating to next result
+    /// \param parent Parent object
+    /// \param parentDialog Paret dialog for tool dialog
+    explicit PDFToolManager(PDFDrawWidgetProxy* proxy, QAction* findPreviousAction, QAction* findNextAction, QObject* parent, QWidget* parentDialog);
+
+    /// Sets document
+    /// \param document Document
+    void setDocument(const PDFDocument* document);
+
+    enum PredefinedTools
+    {
+        FindTextTool,
+        ToolEnd
+    };
+
+    /// Returns first active tool from tool set. If no tool is active,
+    /// then nullptr is returned.
+    PDFWidgetTool* getActiveTool() const;
+
+    /// Returns find text tool
+    PDFFindTextTool* getFindTextTool() const;
+
+private:
+    std::set<PDFWidgetTool*> m_tools;
+    std::array<PDFWidgetTool*, ToolEnd> m_predefinedTools;
+};
+
+}   // namespace pdf
+
+#endif // PDFWIDGETTOOL_H

PdfForQtViewer/pdfadvancedfindwidget.cpp

@@ -93,6 +93,7 @@ void PDFAdvancedFindWidget::on_searchButton_clicked()
     }
 
     m_findResults.clear();
+    m_textSelection.dirty();
     updateResultsUI();
 
     pdf::PDFAsynchronousTextLayoutCompiler* compiler = m_proxy->getTextLayoutCompiler();
@@ -173,7 +174,7 @@ void PDFAdvancedFindWidget::drawPage(QPainter* painter,
 
 void PDFAdvancedFindWidget::performSearch()
 {
-    if (m_parameters.isSearchFinished)
+    if (m_parameters.isSearchFinished || m_parameters.phrase.isEmpty())
     {
         return;
     }
@@ -269,6 +270,7 @@ pdf::PDFTextSelection PDFAdvancedFindWidget::getTextSelectionImpl() const
 
         result.addItems(findResult.textSelectionItems, color);
     }
+    result.build();
 
     return result;
 }

PdfForQtViewer/pdfforqtviewer.qrc

@@ -27,5 +27,9 @@
         <file>resources/info.svg</file>
         <file>resources/send-mail.svg</file>
         <file>resources/cms.svg</file>
+        <file>resources/find.svg</file>
+        <file>resources/find-advanced.svg</file>
+        <file>resources/find-next.svg</file>
+        <file>resources/find-previous.svg</file>
     </qresource>
 </RCC>

PdfForQtViewer/pdfviewermainwindow.cpp

@@ -79,7 +79,8 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     m_taskbarButton(new QWinTaskbarButton(this)),
     m_progressTaskbarIndicator(nullptr),
     m_progressDialog(nullptr),
-    m_isBusy(false)
+    m_isBusy(false),
+    m_toolManager(nullptr)
 {
     ui->setupUi(this);
 
@@ -93,6 +94,8 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     ui->actionZoom_In->setShortcut(QKeySequence::ZoomIn);
     ui->actionZoom_Out->setShortcut(QKeySequence::ZoomOut);
     ui->actionFind->setShortcut(QKeySequence::Find);
+    ui->actionFindPrevious->setShortcut(QKeySequence::FindPrevious);
+    ui->actionFindNext->setShortcut(QKeySequence::FindNext);
 
     connect(ui->actionOpen, &QAction::triggered, this, &PDFViewerMainWindow::onActionOpenTriggered);
     connect(ui->actionClose, &QAction::triggered, this, &PDFViewerMainWindow::onActionCloseTriggered);
@@ -188,6 +191,7 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     toggleAdvancedFindAction->setObjectName("actionAdvancedFind");
     toggleAdvancedFindAction->setText(tr("Advanced Find"));
     toggleAdvancedFindAction->setShortcut(QKeySequence("Ctrl+Shift+F"));
+    toggleAdvancedFindAction->setIcon(QIcon(":/resources/find-advanced.svg"));
     ui->menuEdit->insertAction(nullptr, toggleAdvancedFindAction);
 
     ui->actionRenderOptionAntialiasing->setData(pdf::PDFRenderer::Antialiasing);
@@ -206,6 +210,9 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     ui->menuView->addAction(m_sidebarDockWidget->toggleViewAction());
     m_sidebarDockWidget->toggleViewAction()->setObjectName("actionSidebar");
 
+    // Initialize tools
+    m_toolManager = new pdf::PDFToolManager(m_pdfWidget->getDrawWidgetProxy(), ui->actionFindPrevious, ui->actionFindNext, this, this);
+
     connect(m_pdfWidget->getDrawWidgetProxy(), &pdf::PDFDrawWidgetProxy::drawSpaceChanged, this, &PDFViewerMainWindow::onDrawSpaceChanged);
     connect(m_pdfWidget->getDrawWidgetProxy(), &pdf::PDFDrawWidgetProxy::pageLayoutChanged, this, &PDFViewerMainWindow::onPageLayoutChanged);
     connect(m_pdfWidget, &pdf::PDFWidget::pageRenderingErrorsChanged, this, &PDFViewerMainWindow::onPageRenderingErrorsChanged, Qt::QueuedConnection);
@@ -215,6 +222,7 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
     connect(m_progress, &pdf::PDFProgress::progressFinished, this, &PDFViewerMainWindow::onProgressFinished);
     connect(&m_futureWatcher, &QFutureWatcher<AsyncReadingResult>::finished, this, &PDFViewerMainWindow::onDocumentReadingFinished);
     connect(this, &PDFViewerMainWindow::queryPasswordRequest, this, &PDFViewerMainWindow::onQueryPasswordRequest, Qt::BlockingQueuedConnection);
+    connect(ui->actionFind, &QAction::triggered, this, [this] { m_toolManager->getFindTextTool()->setActive(true); });
 
     readActionSettings();
     updatePageLayoutActions();
@@ -756,6 +764,7 @@ void PDFViewerMainWindow::updateActionsAvailability()
     ui->actionFitWidth->setEnabled(hasValidDocument);
     ui->actionFitHeight->setEnabled(hasValidDocument);
     ui->actionRendering_Errors->setEnabled(hasValidDocument);
+    ui->actionFind->setEnabled(hasValidDocument);
     setEnabled(!isBusy);
 }
 
@@ -857,6 +866,7 @@ void PDFViewerMainWindow::onDocumentReadingFinished()
         case pdf::PDFDocumentReader::Result::Cancelled:
             break; // Do nothing, user cancelled the document reading
     }
+    updateActionsAvailability();
 }
 
 void PDFViewerMainWindow::setDocument(const pdf::PDFDocument* document)
@@ -874,6 +884,7 @@ void PDFViewerMainWindow::setDocument(const pdf::PDFDocument* document)
         m_optionalContentActivity = new pdf::PDFOptionalContentActivity(document, pdf::OCUsage::View, this);
     }
 
+    m_toolManager->setDocument(document);
     m_pdfWidget->setDocument(document, m_optionalContentActivity);
     m_sidebarWidget->setDocument(document, m_optionalContentActivity);
     m_advancedFindWidget->setDocument(document);

PdfForQtViewer/pdfviewermainwindow.h

@@ -25,6 +25,7 @@
 #include "pdfviewersettings.h"
 #include "pdfdocumentreader.h"
 #include "pdfdocumentpropertiesdialog.h"
+#include "pdfwidgettool.h"
 
 #include <QFuture>
 #include <QTreeView>
@@ -163,6 +164,8 @@ private:
 
     QProgressDialog* m_progressDialog;
     bool m_isBusy;
+
+    pdf::PDFToolManager* m_toolManager;
 };
 
 }   // namespace pdfviewer

PdfForQtViewer/pdfviewermainwindow.ui

@@ -101,6 +101,8 @@
      <string>Edit</string>
     </property>
     <addaction name="actionFind"/>
+    <addaction name="actionFindPrevious"/>
+    <addaction name="actionFindNext"/>
    </widget>
    <addaction name="menuFile"/>
    <addaction name="menuEdit"/>
@@ -348,10 +350,32 @@
    </property>
   </action>
   <action name="actionFind">
+   <property name="icon">
+    <iconset resource="pdfforqtviewer.qrc">
+     <normaloff>:/resources/find.svg</normaloff>:/resources/find.svg</iconset>
+   </property>
    <property name="text">
     <string>Find</string>
    </property>
   </action>
+  <action name="actionFindPrevious">
+   <property name="icon">
+    <iconset resource="pdfforqtviewer.qrc">
+     <normaloff>:/resources/find-previous.svg</normaloff>:/resources/find-previous.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Find Previous</string>
+   </property>
+  </action>
+  <action name="actionFindNext">
+   <property name="icon">
+    <iconset resource="pdfforqtviewer.qrc">
+     <normaloff>:/resources/find-next.svg</normaloff>:/resources/find-next.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Find Next</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources>

PdfForQtViewer/resources/find-advanced.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="30mm"
+   height="30mm"
+   viewBox="0 0 30 30"
+   version="1.1"
+   id="svg5291"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="find-advanced.svg">
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+       sodipodi:type="inkscape:persp3d"
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+     bordercolor="#666666"
+     borderopacity="1.0"
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+     inkscape:pageshadow="2"
+     inkscape:zoom="7.9999996"
+     inkscape:cx="96.758243"
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+     inkscape:document-units="mm"
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+        <dc:title></dc:title>
+        <dc:creator>
+          <cc:Agent>
+            <dc:title>Jakub Melka</dc:title>
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+        </dc:creator>
+        <cc:license
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+      <cc:License
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+        <cc:permits
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+        <cc:permits
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+        <cc:requires
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PdfForQtViewer/resources/find-next.svg

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+
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+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
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+   height="30mm"
+   viewBox="0 0 30 30"
+   version="1.1"
+   id="svg5291"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
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+     bordercolor="#666666"
+     borderopacity="1.0"
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PdfForQtViewer/resources/find-previous.svg

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