import os import ConfigParser import copy from Tkinter import NW,CENTER from PIL import Image from PIL import ImageTk from pp_utils import Monitor class ScreenDriver(object): canvas = None ##The Pi presents canvas, click areas are draawn on this, not individual show canvases. image_obj=[] def __init__(self): self.mon=Monitor() # read screen.cfg def read(self,pp_dir,pp_home,pp_profile): self.pp_dir=pp_dir self.pp_home=pp_home # try inside profile tryfile=pp_profile+os.sep+'pp_io_config'+os.sep+'screen.cfg' # self.mon.log(self,"Trying screen.cfg in profile at: "+ tryfile) if os.path.exists(tryfile): filename=tryfile else: #give congiparser an empty filename so it returns an empty config. filename='' ScreenDriver.config = ConfigParser.ConfigParser() ScreenDriver.config.read(filename) if filename != '': self.mon.log(self,"screen.cfg read from "+ filename) return 'normal','screen.cfg read' def click_areas(self): return ScreenDriver.config.sections() def get(self,section,item): return ScreenDriver.config.get(section,item) def is_in_config(self,section,item): return ScreenDriver.config.has_option(section,item) # make click areas on the screen, bind them to their symbolic name, and create a callback if it is clicked. # click areas must be polygon as outline rectangles are not filled as far as find_closest goes # canvas is the PiPresents canvas def make_click_areas(self,canvas,callback): ScreenDriver.canvas=canvas self.callback=callback reason='' ScreenDriver.image_obj=[] for area in self.click_areas(): reason,message,points = self.parse_points(self.get(area,'points'),self.get(area,'name')) if reason == 'error': break # calculate centre of polygon vertices = len(points)/2 # print area, 'vertices',vertices sum_x=0 sum_y=0 for i in range(0,vertices): # print i sum_x=sum_x+int(points[2*i]) # print int(points[2*i]) sum_y=sum_y+int(points[2*i+1]) # print int(points[2*i+1]) polygon_centre_x=sum_x/vertices polygon_centre_y=sum_y/vertices ScreenDriver.canvas.create_polygon(points, fill=self.get (area,'fill-colour'), outline=self.get (area,'outline-colour'), tags=("pp-click-area",self.get(area,'name')), state='hidden') # image for the button if not self.is_in_config(area,'image'): reason='error' message='missing image fields in screen.cfg, see 1.3 release notes' break image_name=self.get(area,'image') if image_name !='': image_width = int(self.get(area,'image-width')) image_height = int(self.get(area,'image-height')) image_path=self.complete_path(image_name) if os.path.exists(image_path) is True: self.pil_image=Image.open(image_path) else: image_path=self.pp_dir+os.sep+'pp_resources'+os.sep+'button.jpg' if os.path.exists(image_path) is True: self.mon.warn(self,'Default button image used for '+ area) self.pil_image=Image.open(image_path) else: self.mon.warn(self,'Button image does not exist for '+ area) self.pil_image=None if self.pil_image is not None: self.pil_image=self.pil_image.resize((image_width-1,image_height-1)) self.photo_image_id=ImageTk.PhotoImage(self.pil_image) image_id=self.canvas.create_image(polygon_centre_x,polygon_centre_y, image=self.photo_image_id, anchor=CENTER, tags=('pp-click-area',self.get(area,'name')), state='hidden') del self.pil_image ScreenDriver.image_obj.append(self.photo_image_id) # write the label at the centroid if self.get(area,'text') != '': ScreenDriver.canvas.create_text(polygon_centre_x,polygon_centre_y, text=self.get(area,'text'), fill=self.get(area,'text-colour'), font=self.get(area,'text-font'), tags=('pp-click-area',self.get(area,'name')), state='hidden') ScreenDriver.canvas.bind('',self.click_pressed) if reason == 'error': return 'error',message else: return 'normal','made click areas' # callback for click on screen def click_pressed(self,event): overlapping = event.widget.find_overlapping(event.x-5,event.y-5,event.x+5,event.y+5) for item in overlapping: # print ScreenDriver.canvas.gettags(item) if ('pp-click-area' in ScreenDriver.canvas.gettags(item)) and ScreenDriver.canvas.itemcget(item,'state') == 'normal': self.mon.log(self, "Click on screen: "+ ScreenDriver.canvas.gettags(item)[1]) self.callback(ScreenDriver.canvas.gettags(item)[1],'SCREEN') # need break as find_overlapping returns two results for each click, one with 'current' one without. break def is_click_area(self,test_area): click_areas=ScreenDriver.canvas.find_withtag('pp-click-area') for area in click_areas: if test_area in ScreenDriver.canvas.gettags(area): return True return False # use links with the symbolic name of click areas to enable the click areas in a show def enable_click_areas(self,links): for link in links: if self.is_click_area(link[0]) and link[1] != 'null': # print 'enabling link ',link[0] ScreenDriver.canvas.itemconfig(link[0],state='normal') def hide_click_areas(self,links): # hide click areas for link in links: if self.is_click_area(link[0]) and link[1] != 'null': # print 'disabling link ',link[0] ScreenDriver.canvas.itemconfig(link[0],state='hidden') # this does not seem to change the colour of the polygon # ScreenDriver.canvas.itemconfig('pp-click-area',state='hidden') ScreenDriver.canvas.update_idletasks( ) def parse_points(self,points_text,area): if points_text.strip() == '': return 'error','No points in click area: '+area,[] if '+' in points_text: # parse x+y+width*height fields=points_text.split('+') if len(fields) != 3: return 'error','Do not understand click area points: '+area,[] dimensions=fields[2].split('*') if len(dimensions)!=2: return 'error','Do not understand click area points: '+area,[] if not fields[0].isdigit(): return 'error','x1 is not a positive integer in click area: '+area,[] else: x1=int(fields[0]) if not fields[1].isdigit(): return 'error','y1 is not a positive integer in click area: '+area,[] else: y1=int(fields[1]) if not dimensions[0].isdigit(): return 'error','width1 is not a positive integer in click area: '+area,[] else: width=int(dimensions[0]) if not dimensions[1].isdigit(): return 'error','height is not a positive integer in click area: '+area,[] else: height=int(dimensions[1]) return 'normal','',[str(x1),str(y1),str(x1+width),str(y1),str(x1+width),str(y1+height),str(x1),str(y1+height)] else: # parse unlimited set of x,y,coords points=points_text.split() if len(points) < 6: return 'error','Less than 3 vertices in click area: '+area,[] if len(points)%2 != 0: return 'error','Odd number of points in click area: '+area,[] for point in points: if not point.isdigit(): return 'error','point is not a positive integer in click area: '+area,[] return 'normal','parsed points OK',points def complete_path(self,track_file): # complete path of the filename of the selected entry if track_file != '' and track_file[0]=="+": track_file=self.pp_home+track_file[1:] elif track_file[0] == "@": track_file=self.pp_profile+track_file[1:] return track_file