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//===========================================
// Lumina-desktop source code
// Copyright (c) 2017, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
// This is a simple class for loading/serving icon files
// from the icon theme or local filesystem
//===========================================
#include <QHash>
#include <QIcon>
#include <QPixmap>
#include <QFileSystemWatcher>
#include <QString>
#include <QFile>
#include <QDateTime>
#include <QAbstractButton>
#include <QLabel>
#include <QAction>
#include <QPointer>
//Data structure for saving the icon/information internally
struct icon_data{
QString fullpath;
QDateTime lastread;
QList<QPointer<QLabel> > pendingLabels;
QList<QPointer<QAbstractButton> > pendingButtons;
QList<QPointer<QAction> > pendingActions;
QList<QPointer<QMenu> > pendingMenus;
QIcon icon;
QIcon thumbnail;
};
class LIconCache : public QObject{
Q_OBJECT
public:
LIconCache(QObject *parent = 0);
~LIconCache();
//Static method for using this class (DO NOT MIX WITH GLOBAL OBJECT METHOD)
// Either use this the entire time, or use a saved/global object - pick one and stick with it
// otherwise you may end up with multiple icon cache's running for your application
static LIconCache* instance();
//Icon Checks
bool exists(QString icon);
bool isLoaded(QString icon);
QString findFile(QString icon); //find the full path of a given file/name (searching the current Icon theme)
//Special loading routines for QLabel and QAbstractButton (pushbutton, toolbutton, etc)
void loadIcon(QAbstractButton *button, QString icon, bool noThumb = false);
void loadIcon(QLabel *label, QString icon, bool noThumb = false);
void loadIcon(QAction *action, QString icon, bool noThumb = false);
void loadIcon(QMenu *action, QString icon, bool noThumb = false);
QIcon loadIcon(QString icon, bool noThumb = false); //generic loading routine - does not background the loading of icons when not in the cache
void clearIconTheme(); //use when the icon theme changes to refresh all requested icons
void clearAll(); //Clear all cached icons
private:
QHash<QString, icon_data> HASH;
QFileSystemWatcher *WATCHER;
icon_data createData(QString icon);
QStringList getChildIconDirs(QString path); //recursive function to find directories with icons in them
QStringList getIconThemeDepChain(QString theme, QStringList paths);
void startReadFile(QString id, QString path);
void ReadFile(LIconCache *obj, QString id, QString path);
bool isThemeIcon(QString id);
QIcon iconFromTheme(QString id);
private slots:
void IconLoaded(QString id, QDateTime sync, QByteArray *data);
signals:
void InternalIconLoaded(QString, QDateTime, QByteArray*); //INTERNAL SIGNAL - DO NOT USE in other classes/objects
void IconAvailable(QString); //way for classes to listen/reload icons as they change
};
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