kicad/include/tool/tool_dispatcher.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2013 CERN
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* Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
*
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
* 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.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __TOOL_DISPATCHER_H
#define __TOOL_DISPATCHER_H
#include <vector>
#include <wx/event.h>
#include <tool/tool_event.h> // Needed for MD_ constants
class TOOL_MANAGER;
class PCB_BASE_FRAME;
class ACTIONS;
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namespace KIGFX
{
class VIEW;
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}
/**
* - takes wx events,
* - fixes all wx quirks (mouse warping, panning, ordering problems, etc)
* - translates coordinates to world space
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* - low-level input conditioning (drag/click threshold), updating mouse position during
* view auto-scroll/pan.
* - issues TOOL_EVENTS to the tool manager
*/
class TOOL_DISPATCHER : public wxEvtHandler
{
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public:
/**
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* @param aToolMgr: tool manager instance the events will be sent to.
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*/
TOOL_DISPATCHER( TOOL_MANAGER* aToolMgr );
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virtual ~TOOL_DISPATCHER();
/**
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* Bring the dispatcher to its initial state.
*/
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virtual void ResetState();
/**
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* Process wxEvents (mostly UI events), translate them to TOOL_EVENTs, and make tools
* handle those.
*
* @param aEvent is the wxWidgets event to be processed.
*/
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virtual void DispatchWxEvent( wxEvent& aEvent );
/**
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* Map a wxWidgets key event to a TOOL_EVENT.
*/
OPT<TOOL_EVENT> GetToolEvent( wxKeyEvent* aKeyEvent, bool* aSpecialKeyFlag );
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private:
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///< Number of mouse buttons that is handled in events.
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static const int MouseButtonCount = 3;
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///< The time threshold for a mouse button press that distinguishes between a single mouse
///< click and a beginning of drag event (expressed in milliseconds).
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static const int DragTimeThreshold = 300;
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///< The distance threshold for mouse cursor that distinguishes between a single mouse click
///< and a beginning of drag event (expressed in screen pixels).
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static const int DragDistanceThreshold = 8;
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///< Handles mouse related events (click, motion, dragging).
bool handleMouseButton( wxEvent& aEvent, int aIndex, bool aMotion );
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///< Saves the state of key modifiers (Alt, Ctrl and so on).
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static int decodeModifiers( const wxKeyboardState* aState )
{
int mods = 0;
if( aState->ControlDown() )
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mods |= MD_CTRL;
if( aState->AltDown() )
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mods |= MD_ALT;
if( aState->ShiftDown() )
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mods |= MD_SHIFT;
return mods;
}
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///< Stores all the information regarding a mouse button state.
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struct BUTTON_STATE;
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///< The last mouse cursor position (in world coordinates).
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VECTOR2D m_lastMousePos;
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///< State of mouse buttons.
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std::vector<BUTTON_STATE*> m_buttons;
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///< Returns the instance of VIEW, used by the application.
KIGFX::VIEW* getView();
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///< Instance of tool manager that cooperates with the dispatcher.
TOOL_MANAGER* m_toolMgr;
};
#endif