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88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* EventsReceiver.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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VCMI_LIB_NAMESPACE_BEGIN
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class Point;
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VCMI_LIB_NAMESPACE_END
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class EventDispatcher;
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enum class MouseButton;
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enum class EShortcut;
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using boost::logic::tribool;
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/// Class that is capable of subscribing and receiving input events
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/// Acts as base class for all UI elements
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class AEventsReceiver
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{
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friend class EventDispatcher;
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std::map<MouseButton, bool> currentMouseState;
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ui16 activeState;
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bool hoveredState;
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bool panningState;
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protected:
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/// Activates particular events for this UI element. Uses unnamed enum from this class
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void activateEvents(ui16 what);
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/// Deactivates particular events for this UI element. Uses unnamed enum from this class
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void deactivateEvents(ui16 what);
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virtual void clickLeft(tribool down, bool previousState) {}
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virtual void clickRight(tribool down, bool previousState) {}
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virtual void clickDouble() {}
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/// Called when user pans screen by specified distance
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virtual void gesturePanning(const Point & initialPosition, const Point & currentPosition, const Point & lastUpdateDistance) {}
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virtual void gesturePinch(const Point & centerPosition, double lastUpdateFactor) {}
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virtual void wheelScrolled(int distance) {}
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virtual void mouseMoved(const Point & cursorPosition) {}
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/// Called when UI element hover status changes
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virtual void hover(bool on) {}
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/// Called when UI element panning gesture status changes
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virtual void panning(bool on, const Point & initialPosition, const Point & finalPosition) {}
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virtual void textInputed(const std::string & enteredText) {}
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virtual void textEdited(const std::string & enteredText) {}
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virtual void keyPressed(EShortcut key) {}
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virtual void keyReleased(EShortcut key) {}
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virtual void tick(uint32_t msPassed) {}
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virtual bool captureThisKey(EShortcut key) = 0;
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/// If true, event of selected type in selected position will be processed by this element
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virtual bool receiveEvent(const Point & position, int eventType) const= 0;
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public:
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AEventsReceiver();
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virtual ~AEventsReceiver() = default;
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/// These are the arguments that can be used to determine what kind of input UI element will receive
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enum {LCLICK=1, RCLICK=2, HOVER=4, MOVE=8, KEYBOARD=16, TIME=32, GENERAL=64, WHEEL=128, DOUBLECLICK=256, TEXTINPUT=512, GESTURE_PANNING=1024, ALL=0xffff};
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/// Returns true if element is currently hovered by mouse
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bool isHovered() const;
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/// Returns true if panning/swiping gesture is currently active
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bool isPanning() const;
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/// Returns true if element is currently active and may receive events
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bool isActive() const;
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/// Returns true if particular mouse button was pressed when inside this element
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bool isMouseButtonPressed(MouseButton btn) const;
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};
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