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78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
from tkinter import *
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# allows moving dots with multiple selection.
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SELECTED_COLOR = "red"
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UNSELECTED_COLOR = "blue"
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class Test(Frame):
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###################################################################
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###### Event callbacks for THE CANVAS (not the stuff drawn on it)
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###################################################################
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def mouseDown(self, event):
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# see if we're inside a dot. If we are, it
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# gets tagged as CURRENT for free by tk.
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if not event.widget.find_withtag(CURRENT):
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# we clicked outside of all dots on the canvas. unselect all.
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# re-color everything back to an unselected color
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self.draw.itemconfig("selected", fill=UNSELECTED_COLOR)
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# unselect everything
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self.draw.dtag("selected")
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else:
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# mark as "selected" the thing the cursor is under
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self.draw.addtag("selected", "withtag", CURRENT)
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# color it as selected
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self.draw.itemconfig("selected", fill=SELECTED_COLOR)
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self.lastx = event.x
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self.lasty = event.y
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def mouseMove(self, event):
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self.draw.move("selected", event.x - self.lastx, event.y - self.lasty)
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self.lastx = event.x
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self.lasty = event.y
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def makeNewDot(self):
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# create a dot, and mark it as current
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fred = self.draw.create_oval(0, 0, 20, 20,
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fill=SELECTED_COLOR, tags=CURRENT)
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# and make it selected
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self.draw.addtag("selected", "withtag", CURRENT)
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def createWidgets(self):
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self.QUIT = Button(self, text='QUIT', foreground='red',
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command=self.quit)
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################
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# make the canvas and bind some behavior to it
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################
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self.draw = Canvas(self, width="5i", height="5i")
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Widget.bind(self.draw, "<1>", self.mouseDown)
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Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
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# and other things.....
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self.button = Button(self, text="make a new dot", foreground="blue",
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command=self.makeNewDot)
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message = ("%s dots are selected and can be dragged.\n"
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"%s are not selected.\n"
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"Click in a dot to select it.\n"
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"Click on empty space to deselect all dots."
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) % (SELECTED_COLOR, UNSELECTED_COLOR)
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self.label = Message(self, width="5i", text=message)
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self.QUIT.pack(side=BOTTOM, fill=BOTH)
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self.label.pack(side=BOTTOM, fill=X, expand=1)
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self.button.pack(side=BOTTOM, fill=X)
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self.draw.pack(side=LEFT)
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def __init__(self, master=None):
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Frame.__init__(self, master)
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Pack.config(self)
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self.createWidgets()
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test = Test()
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test.mainloop()
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