/usr/include/qgis/qgsmapcanvastracer.h is in libqgis-dev 2.18.17+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | /***************************************************************************
qgsmapcanvastracer.h
---------------------
begin : January 2016
copyright : (C) 2016 by Martin Dobias
email : wonder dot sk at gmail 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 QGSMAPCANVASTRACER_H
#define QGSMAPCANVASTRACER_H
#include "qgstracer.h"
class QAction;
class QgsMapCanvas;
class QgsMessageBar;
class QgsMessageBarItem;
/** \ingroup gui
* Extension of QgsTracer that provides extra functionality:
* - automatic updates of own configuration based on canvas settings
* - reporting of issues to the user via message bar
* - determines whether tracing is currently enabled by the user
*
* A simple registry of tracer instances associated to map canvas instances
* is kept for convenience. (Map tools do not need to create their local
* tracer instances and map canvas API is not "polluted" by this optional
* functionality).
*
* @note added in QGIS 2.14
*/
class GUI_EXPORT QgsMapCanvasTracer : public QgsTracer
{
Q_OBJECT
public:
//! Create tracer associated with a particular map canvas, optionally message bar for reporting
explicit QgsMapCanvasTracer( QgsMapCanvas* canvas, QgsMessageBar* messageBar = 0 );
~QgsMapCanvasTracer();
//! Access to action that user may use to toggle tracing on/off. May be null if no action was associated
QAction* actionEnableTracing() const { return mActionEnableTracing; }
//! Assign "enable tracing" checkable action to the tracer.
//! The action is used to determine whether tracing is currently enabled by the user
void setActionEnableTracing( QAction* action ) { mActionEnableTracing = action; }
//! Retrieve instance of this class associated with given canvas (if any).
//! The class keeps a simple registry of tracers associated with map canvas
//! instances for easier access to the common tracer by various map tools
static QgsMapCanvasTracer* tracerForCanvas( QgsMapCanvas* canvas );
//! Report a path finding error to the user
void reportError( PathError err, bool addingVertex );
protected:
//! Sets configuration from current snapping settings and canvas settings
virtual void configure();
private slots:
void onCurrentLayerChanged();
private:
static QHash<QgsMapCanvas*, QgsMapCanvasTracer*>& tracers();
QgsMapCanvas* mCanvas;
QgsMessageBar* mMessageBar;
QgsMessageBarItem* mLastMessage;
QAction* mActionEnableTracing;
};
#endif // QGSMAPCANVASTRACER_H
|