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103 lines
3.1 KiB
C++
103 lines
3.1 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 EShortcut;
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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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ui16 activeState;
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bool hoveredState;
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bool panningState;
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bool mouseClickedState;
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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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/// allows capturing key input so it will be delivered only to this element
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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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virtual void clickPressed(const Point & cursorPosition) {}
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virtual void clickReleased(const Point & cursorPosition) {}
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virtual void clickCancel(const Point & cursorPosition) {}
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virtual void showPopupWindow(const Point & cursorPosition) {}
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virtual void clickDouble(const Point & cursorPosition) {}
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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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/// Called when user pitches screen, requesting scaling by specified factor
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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, const Point & lastUpdateDistance) {}
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virtual void mouseDragged(const Point & cursorPosition, const Point & lastUpdateDistance) {}
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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 gesture status changes
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virtual void gesture(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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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
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{
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LCLICK = 1,
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SHOW_POPUP = 2,
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HOVER = 4,
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MOVE = 8,
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KEYBOARD = 16,
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TIME = 32,
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GENERAL = 64,
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WHEEL = 128,
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DOUBLECLICK = 256,
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TEXTINPUT = 512,
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GESTURE = 1024,
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DRAG = 2048,
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};
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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 isGesturing() 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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};
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