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CUGL 2.0
Cornell University Game Library
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CUGL 2.0
Cornell University Game Library
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#include <CUMouse.h>
Public Types | |
| enum | PointerAwareness { PointerAwareness::BUTTON, PointerAwareness::DRAG, PointerAwareness::ALWAYS } |
| typedef std::function< void(const MouseEvent &event, Uint8 clicks, bool focus)> | ButtonListener |
| typedef std::function< void(const MouseEvent &event, const Vec2 previous, bool focus)> | MotionListener |
| typedef std::function< void(const MouseWheelEvent &event, bool focus)> | WheelListener |
Protected Member Functions | |
| Mouse () | |
| virtual | ~Mouse () |
| bool | init () |
| virtual void | dispose () override |
| virtual void | clearState () override |
| virtual bool | updateState (const SDL_Event &event, const Timestamp &stamp) override |
| virtual void | queryEvents (std::vector< Uint32 > &eventset) override |
 Protected Member Functions inherited from cugl::InputDevice | |
| InputDevice () | |
| virtual | ~InputDevice () |
| bool | initWithName (const std::string name) |
Protected Attributes | |
| PointerAwareness | _awareness |
| ButtonState | _lastState |
| ButtonState | _currState |
| Vec2 | _lastPoint |
| Vec2 | _currPoint |
| Vec2 | _wheelOffset |
| std::unordered_map< Uint32, ButtonListener > | _pressListeners |
| std::unordered_map< Uint32, ButtonListener > | _releaseListeners |
| std::unordered_map< Uint32, MotionListener > | _moveListeners |
| std::unordered_map< Uint32, MotionListener > | _dragListeners |
| std::unordered_map< Uint32, WheelListener > | _wheelListeners |
| Protected Attributes inherited from cugl::InputDevice | |
| std::string | _name |
| Uint32 | _focus |
| Uint32 | _nextKey |
Friends | |
| class | Input |
Additional Inherited Members | |
| Static Public Attributes inherited from cugl::InputDevice | |
| static const Uint32 | RESERVED_KEY = UINT32_MAX |
This class is an input device representing the mouse.
This input device represents a standard mouse. Unlike the SDL api, it does not support touch events. If you want access to touch events, you should use the device Touchscreen instead.
As with most devices, we provide support for both listeners and polling the mouse. Polling the mouse will query the mouse state at the start of the frame, but it may miss those case in there are multiple mouse events in a single animation frame. This is a real concern for mouse motion events, as SDL will occasionally record more than one of these a frame.
Listeners are also the preferred way to react to mouse wheel events. Mouse wheel events are relative and hard to accumulate in a polling framework.
Listeners are guaranteed to catch all presses and releases, as long as they are detected by the OS. However, listeners are not called as soon as the event happens. Instead, the events are queued and processed at the start of the animation frame, before the method Application#update(float) is called.
Motion listeners are not active by default. They must be activated by the method setPointerAwareness(PointerAwareness).
This type represents a listener for button presses/releases in the Mouse class.
In CUGL, listeners are implemented as a set of callback functions, not as objects. This allows each listener to implement as much or as little functionality as it wants. A listener is identified by a key which should be a globally unique unsigned int.
This type of listener only responds to button presses and releases, not mouse movement. Listeners are guaranteed to be called at the start of an animation frame, before the method Application#update(float).
The listener does not receive any information indicating whether the event is a press or a release. That is handled when the listener is registered. On the other hand, the listener will get a counter if the press/release is a sequence of rapid clicks. This is a way of detecting double or even triple clicks. The click counter will continue to increment as long as there is a click every .5 seconds.
While mouse listeners do not traditionally require focus like a keyboard does, we have included that functionality. While only one listener can have focus at a time, all listeners will receive input from the Mouse device.
The function type is equivalent to
std::function<void(const MouseEvent& event, Uint8 clicks, bool focus)>
| event | The mouse event for this press/release |
| clicks | The number of recent clicks, including this one |
| focus | Whether the listener currently has focus |
This type represents a listener for movement in the Mouse class.
In CUGL, listeners are implemented as a set of callback functions, not as objects. This allows each listener to implement as much or as little functionality as it wants. A listener is identified by a key which should be a globally unique unsigned int.
This type of listener only responds to mouse movement, not button presses or releases. Listeners are guaranteed to be called at the start of an animation frame, before the method Application#update(float).
In addition the the mouse event, the listener will provide the previously registered mouse location. This will allow you to determin the relative mouse movement.
While mouse listeners do not traditionally require focus like a keyboard does, we have included that functionality. While only one listener can have focus at a time, all listeners will receive input from the Mouse device.
The function type is equivalent to
std::function<void(const MouseEvent& event, const Vec2 previous, bool focus)>
| event | The mouse event for this movement |
| previous | The previous position of the mouse |
| focus | Whether the listener currently has focus |
This type represents a listener for the mouse wheel in the Mouse class.
In CUGL, listeners are implemented as a set of callback functions, not as objects. This allows each listener to implement as much or as little functionality as it wants. A listener is identified by a key which should be a globally unique unsigned int.
This type of listener only responds to the wheel mouse, not any other buttons or mouse movement. Listeners are guaranteed to be called at the start of an animation frame, before the method Application#update(float).
While mouse listeners do not traditionally require focus like a keyboard does, we have included that functionality. While only one listener can have focus at a time, all listeners will receive input from the Mouse device.
The function type is equivalent to
std::function<void(const MouseWheelEvent& event, bool focus)>
| event | The mouse event for this wheel motion |
| focus | Whether the listener currently has focus |
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strong |
This enum is used to represent how sensative this device is to movement.
Movement events can be extremely prolific, especially if they do not require a button press. This enum is used limit how often these events received. By default, a mouse position is only recorded on a mouse press or release.
| Enumerator | |
|---|---|
| BUTTON | Mouse position is only recorded on a press or a release |
| DRAG | Mouse position is only recorded while dragging |
| ALWAYS | Mouse position is always recorded |
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inlineprotected |
Creates and initializes a new mouse device.
The mouse device will ignore all movement events until the method setPointerAwareness(PointerAwareness) is called.
WARNING: Never allocate a mouse device directly. Always use the Input#activate() method instead.
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inlineprotectedvirtual |
Deletes this input device, disposing of all resources
| bool cugl::Mouse::addDragListener | ( | Uint32 | key, |
| MotionListener | listener | ||
| ) |
Adds a mouse release listener for the given object key
There can only be one listener for a given key. If there is already a listener for the key, the method will fail and return false. You must remove a listener before adding a new one for the same key.
This listener is invoked when the mouse is moved while any button is held dowh. This method will fail and return false if the pointer awareness is not DRAG or ALWAYS.
| key | The identifier for the listener |
| listener | The listener to add |
| bool cugl::Mouse::addMotionListener | ( | Uint32 | key, |
| MotionListener | listener | ||
| ) |
Adds a mouse motion listener for the given object key
There can only be one listener for a given key. If there is already a listener for the key, the method will fail and return false. You must remove a listener before adding a new one for the same key.
This listener is invoked when the mouse is moved (with or without any button held down). This method will fail and return false if the pointer awareness is not ALWAYS.
| key | The identifier for the listener |
| listener | The listener to add |
| bool cugl::Mouse::addPressListener | ( | Uint32 | key, |
| ButtonListener | listener | ||
| ) |
Adds a mouse press listener for the given object key
There can only be one listener for a given key. If there is already a listener for the key, the method will fail and return false. You must remove a listener before adding a new one for the same key.
This listener is invoked when a mouse button is pressed.
| key | The identifier for the listener |
| listener | The listener to add |
| bool cugl::Mouse::addReleaseListener | ( | Uint32 | key, |
| ButtonListener | listener | ||
| ) |
Adds a mouse release listener for the given object key
There can only be one listener for a given key. If there is already a listener for the key, the method will fail and return false. You must remove a listener before adding a new one for the same key.
This listener is invoked when a mouse button is released.
| key | The identifier for the listener |
| listener | The listener to add |
| bool cugl::Mouse::addWheelListener | ( | Uint32 | key, |
| WheelListener | listener | ||
| ) |
Adds a mouse wheel listener for the given object key
There can only be one listener for a given key. If there is already a listener for the key, the method will fail and return false. You must remove a listener before adding a new one for the same key.
This listener is invoked when the mouse wheel moves
| key | The identifier for the listener |
| listener | The listener to add |
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inline |
Returns the collection of buttons currently held down
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inline |
Returns the collection of buttons pressed this animation frame
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inline |
Returns the collection of buttons released this animation frame
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inline |
Returns the collection of buttons not currently held down
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overrideprotectedvirtual |
Clears the state of this input device, readying it for the next frame.
Many devices keep track of what happened "this" frame. This method is necessary to advance the frame.
Implements cugl::InputDevice.
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overrideprotectedvirtual |
Unintializes this device, returning it to its default state
An uninitialized device may not work without reinitialization.
Reimplemented from cugl::InputDevice.
| const MotionListener cugl::Mouse::getDragListener | ( | Uint32 | key | ) | const |
Returns the mouse drag listener for the given object key
This listener is invoked when the mouse is moved while any button is held dowh.
If there is no listener for the given key, it returns nullptr. Just because there is a listener does not mean it is active. This listener is only active is the pointer awareness is DRAG or ALWAYS.
| key | The identifier for the listener |
| const MotionListener cugl::Mouse::getMotionListener | ( | Uint32 | key | ) | const |
Returns the mouse motion listener for the given object key
This listener is invoked when the mouse is moved (with or without any button held down).
If there is no listener for the given key, it returns nullptr. Just because there is a listener does not mean it is active. This listener is only active is the pointer awareness is ALWAYS.
| key | The identifier for the listener |
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inline |
Returns the current pointer awareness of this device
Movement events can be extremely prolific, especially if they do not require a button press. This enum is used limit how often these events received. By default, a mouse position is only recorded on a mouse press or release.
| const ButtonListener cugl::Mouse::getPressListener | ( | Uint32 | key | ) | const |
Returns the mouse press listener for the given object key
This listener is invoked when a mouse button is pressed.
If there is no listener for the given key, it returns nullptr.
| key | The identifier for the listener |
| const ButtonListener cugl::Mouse::getReleaseListener | ( | Uint32 | key | ) | const |
Returns the mouse release listener for the given object key
This listener is invoked when a mouse button is released.
If there is no listener for the given key, it returns nullptr.
| key | The identifier for the listener |
| const WheelListener cugl::Mouse::getWheelListener | ( | Uint32 | key | ) | const |
Returns the mouse wheel listener for the given object key
This listener is invoked when the mouse wheel moves
| key | The identifier for the listener |
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inlineprotected |
Initializes this device, acquiring any necessary resources
| bool cugl::Mouse::isListener | ( | Uint32 | key | ) | const |
Returns true if key represents a listener object
An object is a listener if it is a listener for any of the five actions: button press, button release, mouse drag, mouse motion, or wheel motion.
| key | The identifier for the listener |
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inline |
Returns the directional amount the mouse moved this animation frame
This will be (0,0) if the mouse did not move
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inline |
Returns the current position of the mouse this animation frame
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overrideprotectedvirtual |
Determine the SDL events of relevance and store there types in eventset.
An SDL_EventType is really Uint32. This method stores the SDL event types for this input device into the vector eventset, appending them to the end. The Input dispatcher then uses this information to set up subscriptions.
| eventset | The set to store the event types. |
Implements cugl::InputDevice.
| bool cugl::Mouse::removeDragListener | ( | Uint32 | key | ) |
Removes the mouse drag listener for the given object key
If there is no active listener for the given key, this method fails and returns false. This method will succeed if there is a drag listener for the given key, even if the pointer awareness if BUTTON.
This listener is invoked when the mouse is moved while any button is held dowh.
| key | The identifier for the listener |
| bool cugl::Mouse::removeMotionListener | ( | Uint32 | key | ) |
Removes the mouse motion listener for the given object key
If there is no active listener for the given key, this method fails and returns false. This method will succeed if there is a motion listener for the given key, even if the pointer awareness if BUTTON or DRAG.
This listener is invoked when the mouse is moved (with or without any button held down).
| key | The identifier for the listener |
| bool cugl::Mouse::removePressListener | ( | Uint32 | key | ) |
Removes the mouse press listener for the given object key
If there is no active listener for the given key, this method fails and returns false.
This listener is invoked when a mouse button is pressed.
| key | The identifier for the listener |
| bool cugl::Mouse::removeReleaseListener | ( | Uint32 | key | ) |
Removes the mouse release listener for the given object key
If there is no active listener for the given key, this method fails and returns false.
This listener is invoked when a mouse button is released.
| key | The identifier for the listener |
| bool cugl::Mouse::removeWheelListener | ( | Uint32 | key | ) |
Removes the mouse wheel listener for the given object key
If there is no active listener for the given key, this method fails and returns false.
This listener is invoked when the mouse wheel moves
| key | The identifier for the listener |
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overridevirtual |
Requests focus for the given identifier
Only a listener can have focus. This method returns false if key does not refer to an active listener
| key | The identifier for the focus object |
Reimplemented from cugl::InputDevice.
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inline |
Sets the current pointer awareness of this device
Movement events can be extremely prolific, especially if they do not require a button press. This enum is used limit how often these events received. By default, a mouse position is only recorded on a mouse press or release.
If this value is changed from a permission value (e.g. ALWAYS) to a more restrictive one (e.g. BUTTON), then any associated listeners will be deactivated. However, the listeners will not be deleted.
| awareness | The pointer awareness for this device |
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overrideprotectedvirtual |
Processes an SDL_Event
The dispatcher guarantees that an input device only receives events that it subscribes to.
| event | The input event to process |
| stamp | The event timestamp in CUGL time |
Implements cugl::InputDevice.
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inline |
Returns the amount the mouse wheel moved this animation frame.
This will be (0,0) if the mouse wheel did not move
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protected |
The current awareness for pointer movement
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protected |
The mouse position for the current animation frame
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protected |
The mouse buttons held down the current animation frame
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protected |
The set of listeners called whenever a mouse is dragged
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protected |
The mouse position for the previous animation frame
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protected |
The mouse buttons held down the previous animation frame
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protected |
The set of listeners called whenever a mouse is moved
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protected |
The set of listeners called whenever a mouse is pressed
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protected |
The set of listeners called whenever a mouse is released
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protected |
The set of listeners called whenever a mouse wheel is moved
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protected |
The amount of wheel movement this animation frame
1.8.16