qgssvgselectorwidget.h

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/***************************************************************************
    qgssvgselectorwidget.h - group and preview selector for SVG files
                             built off of work in qgssymbollayerwidget

    ---------------------
    begin                : April 2, 2013
    copyright            : (C) 2013 by Larry Shaffer
    email                : larrys at dakcarto dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSSVGSELECTORWIDGET_H
#define QGSSVGSELECTORWIDGET_H

#include "ui_widget_svgselector.h"
#include "qgis_sip.h"

#include "qgsguiutils.h"
#include <QAbstractListModel>
#include <QDialog>
#include <QDialogButtonBox>
#include <QLayout>
#include <QStandardItemModel>
#include <QWidget>
#include <QThread>
#include <QElapsedTimer>
#include "qgis_gui.h"

class QCheckBox;
class QLayout;
class QLineEdit;
class QListView;
class QPushButton;
class QTreeView;


#ifndef SIP_RUN

class GUI_EXPORT QgsSvgSelectorLoader : public QThread
{
    Q_OBJECT

  public:

    QgsSvgSelectorLoader( QObject *parent = nullptr );

    ~QgsSvgSelectorLoader() override;

    void run() override;

    virtual void stop();

    void setPath( const QString &path )
    {
      mPath = path;
    }

  signals:

    void foundSvgs( QStringList svgs );

  private:

    QString mPath;
    bool mCanceled = false;
    QStringList mQueuedSvgs;

    QElapsedTimer mTimer;
    int mTimerThreshold = 0;
    QSet< QString > mTraversedPaths;

    void loadPath( const QString &path );
    void loadImages( const QString &path );

};

class GUI_EXPORT QgsSvgGroupLoader : public QThread
{
    Q_OBJECT

  public:

    QgsSvgGroupLoader( QObject *parent = nullptr );

    ~QgsSvgGroupLoader() override;

    void run() override;

    virtual void stop();

    void setParentPaths( const QStringList &parentPaths )
    {
      mParentPaths = parentPaths;
    }

  signals:

    void foundPath( const QString &parentPath, const QString &path );

  private:

    QStringList mParentPaths;
    bool mCanceled = false;
    QSet< QString > mTraversedPaths;

    void loadGroup( const QString &parentPath );

};

#endif

class GUI_EXPORT QgsSvgSelectorListModel : public QAbstractListModel
{
    Q_OBJECT

  public:

    QgsSvgSelectorListModel( QObject *parent SIP_TRANSFERTHIS, int iconSize = 30 );

    QgsSvgSelectorListModel( QObject *parent SIP_TRANSFERTHIS, const QString &path, int iconSize = 30 );

    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const override;

  protected:
    QStringList mSvgFiles;

  private:
    QPixmap createPreview( const QString &entry ) const;
    QgsSvgSelectorLoader *mSvgLoader = nullptr;

    int mIconSize = 30;

  private slots:

    void addSvgs( const QStringList &svgs );

};


class GUI_EXPORT QgsSvgSelectorGroupsModel : public QStandardItemModel
{
    Q_OBJECT

  public:
    QgsSvgSelectorGroupsModel( QObject *parent SIP_TRANSFERTHIS );
    ~QgsSvgSelectorGroupsModel() override;

  private:
    QgsSvgGroupLoader *mLoader = nullptr;
    QHash< QString, QStandardItem * > mPathItemHash;

  private slots:

    void addPath( const QString &parentPath, const QString &path );
};

class GUI_EXPORT QgsSvgSelectorWidget : public QWidget, private Ui::WidgetSvgSelector
{
    Q_OBJECT

  public:

    QgsSvgSelectorWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    QString currentSvgPath() const;

  public slots:
    void setSvgPath( const QString &svgPath );

  signals:
    void svgSelected( const QString &path );

  protected:
    void populateList();

  private slots:
    void populateIcons( const QModelIndex &idx );
    void svgSelectionChanged( const QModelIndex &idx );
    void updateCurrentSvgPath( const QString &svgPath );
    void svgSourceChanged( const QString &text );

  private:

    int mIconSize = 30;

    QString mCurrentSvgPath; 

};

class GUI_EXPORT QgsSvgSelectorDialog : public QDialog
{
    Q_OBJECT
  public:

    QgsSvgSelectorDialog( QWidget *parent SIP_TRANSFERTHIS = nullptr,
                          Qt::WindowFlags fl = QgsGuiUtils::ModalDialogFlags,
                          QDialogButtonBox::StandardButtons buttons = QDialogButtonBox::Close | QDialogButtonBox::Ok,
                          Qt::Orientation orientation = Qt::Horizontal );
    ~QgsSvgSelectorDialog() override;

    QgsSvgSelectorWidget *svgSelector() { return mSvgSelector; }

  protected:
    QVBoxLayout *mLayout = nullptr;
    QDialogButtonBox *mButtonBox = nullptr;
    QgsSvgSelectorWidget *mSvgSelector = nullptr;
};

#endif // QGSSVGSELECTORWIDGET_H