""" Code illustration: 6.02 Handling Mouse Events ATTRIBUTED ADDED HERE: currentobject = None startx = 0 starty = 0 lastx = 0 lasty = 0 METHODS MODIFIED: create_drawing_canvas - added event bindings for tracking mouse movements and mouse click NEW METHODS ADDED: mouse_down mouse_down_motion mouse_up show_current_coordinates Tkinter GUI Application Development Hotshot """ from Tkinter import * import tkFileDialog import tkMessageBox import Image import ImageTk from tkColorChooser import askcolor import framework class GUI(framework.GUIFramework): background = 'white' foreground = 'red' currentobject = None filename = 'untitled' currentobject = None startx = 0 starty = 0 lastx = 0 lasty = 0 def __init__(self, root): self.root = root self.create_menu() self.create_top_bar() self.create_tool_bar() self.create_drawing_canvas() def create_menu(self): self.menubar = Menu(self.root) self.menuitems = ( 'File- &New/Ctrl+N/self.new_file, &Open/Ctrl+O/self.open_file, Save/Ctrl+S/self.save, SaveAs//self.save_as, Sep, Exit/Alt+F4/self.close', 'Edit- Undo/Ctrl+Z/self.undo, Sep', 'About- About//self.about' ) self.build_menu() self.root.config(menu=self.menubar) def create_top_bar(self): self.topbar = Frame(self.root, height=25, relief=RAISED) self.topbar.pack(fill=X,side=TOP, pady=2) def create_tool_bar(self): self.toolbar = Frame(self.root, width=50, relief=RAISED) self.toolbar.pack(fill=Y,side=LEFT, pady=3) self.create_tool_bar_buttons() self.create_color_pallete() self.curcoordlabel = Label(self.toolbar, text = 'x: 0 \ny: 0 ') self.curcoordlabel.grid(row=13, column=1, columnspan=2, pady=5, padx=1, sticky='w') def create_tool_bar_buttons(self): for i in range(8): self.button = Button(self.toolbar, text=i, command=lambda i=i: self.selected_tool_bar_item(i)) self.button.grid(row=i/2, column=1+i%2, sticky='nsew') def selected_tool_bar_item(self, i): print 'You selected {}'.format(i) def create_color_pallete(self): self.colorpallete = Canvas(self.toolbar, height=55, width =55) self.colorpallete.grid(row=10, column=1, columnspan=2, pady=5, padx=3) self.backgroundpallete = self.colorpallete.create_rectangle(15, 15,48, 48,tags="backgroundpallete", outline=self.background, fill=self.background) self.foregroundpallete = self.colorpallete.create_rectangle(1, 1,33, 33,tags="foregroundpallete", outline=self.foreground, fill=self.foreground) self.colorpallete.tag_bind(self.backgroundpallete, "", self.set_background_color) self.colorpallete.tag_bind(self.foregroundpallete, "", self.set_foreground_color) def set_background_color(self, event=None): self.background = askcolor()[-1] self.colorpallete.itemconfig(self.backgroundpallete, outline=self.background, fill=self.background) def set_foreground_color(self, event=None): self.foreground = askcolor()[-1] self.colorpallete.itemconfig(self.foregroundpallete,outline=self.foreground, fill=self.foreground) def create_drawing_canvas(self): cnvsframe=Frame(self.root,width=900,height=900) cnvsframe.pack(side=RIGHT, expand=YES, fill=BOTH) self.canvas = Canvas(cnvsframe, background="white", width=500,height=500,scrollregion=(0,0,800,800)) hbar=Scrollbar(cnvsframe,orient=HORIZONTAL) hbar.pack(side=BOTTOM,fill=X) hbar.config(command=self.canvas.xview) vbar=Scrollbar(cnvsframe,orient=VERTICAL) vbar.pack(side=RIGHT,fill=Y) vbar.config(command=self.canvas.yview) self.canvas.config(xscrollcommand=hbar.set, yscrollcommand=vbar.set) self.canvas.pack(side=RIGHT, expand=YES, fill=BOTH) self.canvas.bind( "", self.mouse_down) self.canvas.bind( "", self.mouse_down_motion) self.canvas.bind( "", self.mouse_up) self.canvas.bind( "", self.show_current_coordinates) def mouse_down(self, event): self.currentobject = None self.lastx = self.startx = self.canvas.canvasx(event.x) self.lasty = self.starty = self.canvas.canvasy(event.y) def mouse_down_motion(self, event): self.lastx = self.canvas.canvasx(event.x) self.lasty = self.canvas.canvasy(event.y) def mouse_up(self, event): self.lastx = self.canvas.canvasx(event.x) self.lasty = self.canvas.canvasy(event.y) def show_current_coordinates(self, event=None): lx = self.canvas.canvasx(event.x) ly = self.canvas.canvasy(event.y) cord = 'x: %d \ny: %d '%(lx, ly) self.curcoordlabel.config(text=cord) def new_file(self): self.canvas.delete(ALL) self.root.title('untitled') def open_file(self): self.filename = tkFileDialog.askopenfilename(master = self.root, filetypes = [('All Files',('*.jpg', '*.png', '*.tif', '*.gif')), ('jpeg','*.jpg'),('png','*.png'),('tiff','*.tif'), ('gif','*.gif')],title="Open...") if not self.filename: return self.root.title(self.filename) self.img = Image.open(self.filename) self.image = ImageTk.PhotoImage(self.img) self.currentobject = self.canvas.create_image(10, 10, anchor=NW, image=self.image) self.canvas.config(scrollregion=self.canvas.bbox(ALL)) def undo(self, event=None): self.canvas.delete(self.currentobject) def save(self): if self.filename == 'untitled': self.save_as() else: self.actual_save() def save_as(self): try: self.filename = tkFileDialog.asksaveasfilename(master = self.root,filetypes = [('All Files',('*.ps', '*.ps'))], title="Save...") except:pass self.actual_save() def actual_save(self): self.canvas.postscript(file=self.filename, colormode='color') self.root.title(self.filename) def about(self, event=None): tkMessageBox.showinfo("About","Tkinter GUI Application\n Development Hotshot") def close(self, event=None): if tkMessageBox.askokcancel("Quit", "Do you really want to quit?"): self.root.destroy() if __name__ == '__main__': root = Tk() app = GUI(root) root.mainloop()