Tkinter reference: A GUI for Python

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22.2 Event sequencesTkinter has a powerful and general method for allowing you to define exactly whichevents, both specific and general, you want to bind to handlers.In general, an event sequence is a string containing one or more event patterns. Each eventpattern describes one thing that can happen. If there is more than one event pattern ina sequence, the handler will be called only when all the patterns happen in that samesequence.The general form of an event pattern is: The entire pattern is enclosed inside . The type describes the general kind of event, such as a key press or mouse click. You can add optional modifier items before the type to specify combinations suchas the SHIFT or CONTROL keys being depressed during other key presses or mouseclicks. You can add optional detail items to describe what key or mouse button you’relooking for. For mouse buttons, this is 1 for button 1, 2 for button 2, or 3 for button3. The usual setup has button 1 on the left and button 3 on the right, but lefthanderscan swap these positions. For keys on the keyboard, this is either the key’s character (for single-characterkeys like the A or * key) or the key’s name; see below for a list of all key names.Here are some examples to give you the flavor of event patterns:22.3 Event types: The user pressed the first mouse button.: The user pressed the H key.: The user pressed CONTROL-SHIFT-H.The full set of event types is rather large, but a lot of them are not commonly used. Hereare most of the ones you’ll need:ActivateButtonButtonReleaseConfigureDeactivateDestroyA widget is changing from being inactive to beingactive. This refers to changes in the state optionof a widget such as a button changing from inactive(grayed out) to active.The user pressed one of the mouse buttons. Thedetail part specifies which button.The user let up on a mouse button.The user changed the size of a widget, for exampleby dragging a corner or side of the window.A widget is changing from being active to beinginactive. This refers to changes in the state optionof a widget such as a radiobutton changing fromactive to inactive (grayed out).A widget is being destroyed.New Mexico Tech Computer Center Tkinter reference: Events Page 78
EnterExposeFocusInFocusOutKeyPressKeyReleaseLeaveMapMotionUnmapVisibilityThe user moved the mouse pointer into a visiblepart of a widget. (This is different than the ENTERkey, which is a KeyPress event for a key whosename is actually "return".)This event occurs whenever at least some part ofyour application or widget becomes visible afterhaving been covered up by another window.A widget got the input focus. (See Focus, above,for a general introduction to input focus.) Thiscan happen either in response to a user event (likeusing the TAB key to move focus between widgets)or programmatically (for example, your programcalls the .focus_set() on a widget).The input focus was moved out of a widget. Again,the user can cause this event, or your program cancause it.The user pressed a key on the keyboard. The detailpart specifies which key. This keyword may beabbreviated Key.The user let up on a key.The user moved the mouse pointer out of a widget.A widget is being mapped, that is, made visiblein the application. This will happen, for example,when you call the widget’s .grid() method.The user moved the mouse pointer entirely withina widget.A widget is being unmapped and is no longer visible.This happens, for example, when you use thewidget’s .grid_remove() method.Happens when at least some part of the applicationwindow becomes visible on the screen.22.4 Event modifiersThe modifier names that you can use in event sequences include:AltAnyControlDoubleLockShiftTripleThe user is holding the ALT key down.This modifier generalizes an event type. For example,the event pattern applies tothe pressing of any key.The user is holding the CONTROL key down.Specifies two events happening close together intime. For example, describestwo presses of button 1 in rapid succesion.The user has pressed SHIFT LOCK.The user is holding the SHIFT key down.Like Double, but specifies three events in rapidsuccession.You can use shorter forms of the events. Here are some examples: is the same as .x is the same as .New Mexico Tech Computer Center Tkinter reference: Events Page 79
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Tkinter reference: A GUI forPythonC
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Part I: The face of your applicatio
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If you do not provide a sticky attr
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3.3 Colors3.4 FontsThere are two ge
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3.6 Cursors3.7 ImagesThere are quit
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textvariableunderlinewidthwraplengt
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A tagOrId argument specifies one or
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.focus ( tagOrId=None )Moves the fo
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.xview_scroll ( n, what )Same as .x
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5.4 The canvas line objectIn genera
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smoothThe default outline uses stra
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tagswidthwindowThe tags to be assoc
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selectimagestatetakefocustexttextva
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