Viewer Stateのマウスの入力イベント

# マウスの移動やクリック時に呼び出される
def onMouseEvent(self, kwargs):

    ui_event = kwargs["ui_event"]
    device = ui_event.device()
        
    # 左ボタンクリック
    if device.isLeftButton():
        pass
        
    # 中ボタンクリック
    if device.isMiddleButton():
        pass

import hou
import viewerstate.utils as su

class State(object):
    MSG = "Show Mouse Cursor Position"

    def __init__(self, state_name, scene_viewer):
        self.state_name = state_name
        self.scene_viewer = scene_viewer
        self.mouse_screen = hou.Vector2()

        self.cursor_text = "Text"
        self.text = hou.TextDrawable(self.scene_viewer, "text")
                
    def show(self, visible):
        """ Display or hide drawables.
        """
        self.text.show(visible)

    def onEnter(self, kwargs):
        self.show(True)
        self.scene_viewer.setPromptMessage( State.MSG )

    def onResume(self, kwargs):
        self.show(True)
        self.scene_viewer.setPromptMessage( State.MSG )

    def onInterrupt(self,kwargs):
        self.show(False)

    def onMouseEvent(self, kwargs):
        ui_event = kwargs["ui_event"]
        
        mousex = ui_event.device().mouseX()
        mousey = ui_event.device().mouseY()
        
        (origin, dir) = ui_event.ray()
        
        self.mouse_screen = self.scene_viewer.curViewport().mapToScreen(origin)      
        self.cursor_text = "<font size=4,>%.2f, %.2f</font>" % ( self.mouse_screen[0],
            self.mouse_screen[1] )

    def onDraw( self, kwargs ):
        """ This callback is used for rendering the drawables
        """
        handle = kwargs["draw_handle"]

        # cursor text
        params = {
            "text": self.cursor_text,
            "multi_line": True,
            "translate": (self.mouse_screen[0],self.mouse_screen[1], 0.0),
            "highlight_mode": hou.drawableHighlightMode.MatteOverGlow,
            "glow_width": 1,
            "color1": hou.Color(1.0,1.0,1.0),
            "color2": (0.0,0.0,0.0,1.0) }   
        self.text.draw(handle, params)

def createViewerStateTemplate():
    """ Mandatory entry point to create and return the viewer state 
        template to register. """

    state_typename = kwargs["type"].definition().sections()["DefaultState"].contents()
    state_label = "ViewerStateTest::1.0"
    state_cat = hou.sopNodeTypeCategory()

    template = hou.ViewerStateTemplate(state_typename, state_label, state_cat)
    template.bindFactory(State)
    template.bindIcon(kwargs["type"].icon())

    return template

# ワールド空間からスクリーンスペース空間へ座標を変換
viewport = self.scene_viewer.curViewport()
point_pos = hou.Vector3(0,0,0)
view_space_pos = viewport.mapToScreen(point_pos)