Extend Canvas

[jarvisteach]

Canvas needs to function as both a widget and a container.

Should be able to start a canvas and place widgets in it, as well as add/get/set a canvas.

This will probably require making a new class, that implements the contextmanager functions, but a bit more research needs to be done.

[othoma]

Maybe updating drawings on a canvas could be a good improvement.

I did a coloured dice

dicecolors = ["blue", "red", "white", "yellow", "green"]
dicecolor = random.choice(dicecolors)
app.addCanvas("dice")
app.addCanvasRectangle("dice", x=40, y=80, w=100, h=100, fill=dicecolor)
app.addNamedButton("Launch", title="dicebutton", func=dice)

def dice(button):
    if button == "dicebutton":
        dicecolor = random.choice(dicecolors)
        app.clearCanvas("dice")
        app.addCanvasRectangle("dice", x=40, y=80, w=100, h=100, fill=dicecolor)

What about updating the "fill" argument instead of clearing and adding a new Canvas rectangle ?

[jarvisteach]

It's already possible to just update the fill colour, just get a handle on the canvas & rectangle, then callitemconfig():

import random
from appJar import gui

dicecolors = ["blue", "red", "white", "yellow", "green"]

def dice():
    canvas.itemconfig(rect, fill=random.choice(dicecolors))

with gui() as app:
    dicecolor = random.choice(dicecolors)
    canvas = app.addCanvas("dice")
    rect = app.addCanvasRectangle("dice", x=40, y=80, w=100, h=100, fill=dicecolor, tag="dice")
    app.button("Launch", dice)

[othoma]

Oh thanks.

That's excellent. I didn't see that in the documentation.

Thanks for clarifying