Tkinter入门
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# Options

Table 13-2. Canvas Options

Option | Type | Description
--- | --- | ---
`background (bg)` | color |
`borderwidth (bd)` | distance |
`closeenough` |  |
`confine` |  |
`cursor` | cursor |
`height` | distance |
`highlightbackground, highlightcolor` | color | Controls how to draw the focus highlight border. When the widget has focus, the border is drawn in the `highlightcolor` color. Otherwise, it is drawn in the `highlightbackground` color. The defaults are system specific.
`highlightthickness` | distance | Controls the width of the focus highlight border. Default is one or two pixels. Note that the focus highlight border is drawn on top of the canvas coordinate systems; if you don't use scrollbars, a one pixel border covers items drawn at canvas coordinate (0, 0).
`insertbackground` | color | Color used for the insertion cursor.
`insertborderwidth` | distance | Borderwidth for the insertion cursor.
`insertofftime, insertontime` | time | Controls cursor blinking.
`insertwidth` | distance | Width of the insertion cursor.
`relief` | constant | Border decoration. The default is `FLAT`. Other possible values are `SUNKEN`, `RAISED`, `GROOVE`, and `RIDGE`. Note that to show the border, you need to change the `borderwidth` from it's default value of 0. Also note that the border is drawn on top of the canvas coordinate system.
`scrollregion` | 4-tuple | The bounding box of the scrollable area. If this option is not set, the scrolling is not bounded.
`selectbackground` | color |
`selectborderwidth` | distance |
`selectforeground` | color |
`takefocus` | flag | Indicates that the user can use the Tab key to move to this widget. Default is an empty string, which means that the canvas accepts focus only if it has any keyboard bindings (default is off, in other words).
`width` | distance |
`xscrollcommand` | callback |
`xscrollincrement` | distance |
`yscrollcommand` | callback |
`yscrollincrement` | distance |

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