Users can interact with Houdini in viewport through Python Viewer States in the following ways:
Display handles
Interact with geometry
Display guide geometry
Interact with state parameters
Select geometry
Display a custom right-click menu
Interact using low-level UI events, like mouse, keyboard and tablet
Wrap changes in undo blocks
Run cross multiple context-levels
Interact using low-level UI events
UI Event Handlers
These are supported through ui_event, and they are:
onMouseEvent
onMouseDoubleClickEvent
onMouseWheelEvent
onKeyEvent
onKeyTransitEvent
onMenuAction
onMenuPreOpen
onParmChangeEvent
onNodeChangeEvent
onPlaybackChangeEvent
onCommand
Typical ui_event received via callback function's kwargs :
ui_event {
<class hou.ViewerEvent>,
'point': hou.Vector3(2.52767920,2.22849488,5.74832201),
'dir': hou.Vector3(-0.63586962,0.45803502,-0.62118733),
'hasQueuedEvents' :0,
'queuedEvents' : 0,
'value' :[0, 1524, ],
'reason' : hou.uiEventReason.Located,
'valueType' : hou.uiEventValueType.FloatArray,
'device': {
<class hou.UIEventDevice>,
'isAltKey' : 0,
'isAutoRepeat' : 0,
'isKeyPressed' : 0,
'isKeyDown' : 0,
'isKeyUp' : 0,
'isCapsLock' : 0,
'isCtrlKey' : 0,
'isKeyPad' : 0,
'isShiftKey' : 0,
'isFunctionKey' : 0,
'isArrowDown' : 0,
'isArrowLeft' : 0,
'isArrowRight' : 0,
'isArrowUp' : 0,
'isLeftButton' : 0,
'isMiddleButton' : 0,
'isRightButton' : 0,
'keyString' : '',
'keyValue' : 0,
'modifierString' : '',
'mouseWheel' : 16.84,
'mouseX' : 0,
'mouseY' : 1524,
'isTablet' : 0,
'tabletAngle' : 0,
'tabletPressure' : 1,
'tabletRoll' : 0,
'tabletTilt' : 90,
'time' : 573.8
}
}Lifecycle Event Handlers
onEnter
onInterrupt
onExit
onResume
onGenerate
Handle Event Handlers
onHandleToState
onStateToHandle
onBeginHandleToState
onEndHandleToState
Selection Event Handlers
onStartSelection
onSelection
onStopSelection
onLocateSelection
Drag & Drop Event Handlers
onDragTest
onDropGetOptions
onDropAccept
Drawing Event Handlers
onDraw
onDrawInterrupt
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