A Comprehensive Introduction to Python Programming and ... - MSDL

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3.2 The Different Widgets 27 / 75 3.2.4 Entry Method Description deselect() Deselects the checkbutton and stores the value specified by the offvalue option to its associated variable. flash() Redraws the button several times, alternating between active and normal colors. invoke() Simulates a click on the widget (toggles the state, updates the variable and invokes the callback associated with the checkbutton, if any). select() Selects the checkbutton and stores the value specified by the onvalue option to its associated variable. toggle() Similar to invoke(), but does not invoke the callback associated with the checkbutton. The Entry widget allows users to type and edit a single line of text. A portion of this text can be selected. The Entry widget provides the following options: Option Description show Controls how to display the contents of the widget. If non-empty, the widget will replace characters to be displayed by the first character the specified string. To get a password entry widget, use ”*”. The Entry widget defines the following methods: Method Description delete(index), delete(from,to) Delete the character at index, or within the given range. Use delete(0, END) to delete all text in the widget. get() Returns the current contents of the widget. insert(index, text) Inserts text at the given index. Use insert(INSERT, text) to insert text at the cursor, insert(END, text) to append text to the widget. 3.2.5 Frame The Frame widget is a rectangular container for other widgets. It is primarily used as a gemometry master since it allows to group widgets. It can have an unvisible border which is useful to space widgets. It can also have a visible border with a 3D effect, or no border at all. The Frame widget provides the following options:
3.2 The Different Widgets 28 / 75 Option Description cursor Specifies the mouse cursor to be used when the cursor is within the frame. takefocus Specifies whether the user should be able to move the focus to this widget by using the tabulation key (Tab). width, height Specifies the size of the widget. The Frame widget does not provide any methods except the standard Widget methods. 3.2.6 Label The Label widget is used to display text. It can only display text in a single font at a time. The text can span more than one line. In addition, one character in the text can be underlined, usually indicating a keyboard shortcut. The Label widget provides the following options: Option Description anchor Specifies how the text should be placed in a widget. Use one of N, NE, E, SE, S, SW, W, NW, W, NW, CENTER. bitmap Specifies the bitmap to be displayed by the widget. If the image option is given, this option is ignored. image Specifies the image to be displayed by the widget. If specified, this takes precedence over the text and bitmap options. justify Defines how to align multiple lines of text relative to each others. Use LEFT, RIGHT, or CENTER. Differs from anchor in that justify specifies how to align multiple lines of text relative to each other. text Specifies the text to be displayed by the widget. textvariable Specifies the name of a variable that contains the text to be displayed by the widget. If the contents of the variable is modified, the widget will be updated accordingly. The Label widget does not provide any methods except the standard Widget methods. 3.2.7 Listbox The Listbox widget displays a list of strings. Each string is displayed on a separate line. It allows to insert, modify or delete strings from the list. The listbox can only contain text items, and all items must have the same font and colour. Depending on the widget configuration, the user can choose one or more alternatives from the list. The Listbox widget provides the following options:
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