Questions tagged [eventhandler]

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12 views

Need to determine turn in Connect Four based on mouse clicks (Mathematica)

I am making a connect four game and I need to figure out which graphic to use (red or black) by how many times the mouse has been clicked. So I need a counter for mouse clicks. That way I can make an ...
4
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1answer
131 views

Switch bool from False to True on key press?

I would like to let a boolean variable switch when I press a key on the keyboard. For example, I write ...
4
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1answer
54 views

Does MousePosition[“Graphics”] give coordinates in outermost Graphics?

It seems that this issue has been raised a few times, but what exactly does MousePosition["Graphics"] answer? This code ...
4
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0answers
42 views

How to control global key event handling for all front end sessions?

This website collects many methods for implementing user defined keyboard shortcuts through KeyEvent items in KeyEventTranslations.tr, see 16697, 16165, 23285, 2572, etc. Some of these were collected ...
3
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3answers
79 views

EventHandler not handling my events

I seem to be able to use EventHandler to handle mouse events, but not keyboard events. Here is a working example with MouseClicked -- it makes the picture smaller every time the right mouse button is ...
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0answers
24 views

What is the name of the Page Down key when using EventHandler? [duplicate]

I want to trap the PageDown event in an EventHandler. The code I've written is working fine for, say, "RightArrowKeyDown". But for the life of me I can't find the label for the Page Down key. I've ...
2
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0answers
26 views

How to use GestureHandler?

Gesture handlers would be really cool to have. There is a symbol called GestureHandler. It's eight years old (from v9) but intriguing to me, as I could never ever get it to work. Does anyone know ...
6
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0answers
55 views

How to create a conditional EventHandler

Summary Can we make something like the following work as an action for EventHandler? ...
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0answers
24 views

What is the current notebook save event for the `EventHandler`?

Suppose I have an action like follows: ...
3
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1answer
69 views

Nested front-end-only EventHandler

Bug introduced in 11.3 or earlier, and persisting through 12.0 CASE:4372001 confirmed I am running into an issue trying to improve the performance of my user interface by moving as much of the ...
5
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1answer
67 views

How to implement LocatorAutoCreate functionality using EventHandler[]?

The documentation for LocatorPane says that LocatorPane is a special case of EventHandler, and gives the following code: ...
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0answers
31 views

Why does dragging a point with a Tooltip interfere with MousePosition[“Graphics”]?

Consider the following toy example of EventHandler used to implement dragging a point around in a Graphics: ...
3
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1answer
118 views

EventHandler and Dynamic

I just found a behaviour of an EventHandler that I cannot explain. Here is a highly simplified version. I will present two simple ...
1
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1answer
77 views

Multiple calls to SetOptions with NotebookEventActions: How to retain earlier custom event handlers?

I have a module defining handlers of KeyDown events that I reuse in various notebooks. In some cases I need to define separate handlers for additional keys. Unfortunately, later calls to ...
3
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0answers
38 views

How can I disable built in selection action for mouse click events? [duplicate]

I am trying to improve a demonstration that I previously submitted to the Wolfram Demonstration site. That demonstration enables a user to select a position on an Earth globe and see the latitude and ...
0
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1answer
54 views

Help with actions in EventHandler

I am trying to write a program where the user types on the keyboard in a specified location, and Mathematica outputs what you are currently typing, plus a prediction that is updated in real time of ...
0
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0answers
39 views

Is there a “LostFocus” event for controls? [duplicate]

In .Net controls have a LostFocus event that fires when the control is no longer the active object; tabbing to next control or clicking somewhere else on the ...
4
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1answer
138 views

Modify Dynamic value within EventHandler

I'm trying to build a tic tac toe program using a 3x3 board list running inside of a DynamicModule with a separate window displaying the current value and accepting ...
3
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0answers
44 views

Is it possible to prevent LocatorPane from modifying locator positions unless Alt ket is down?

I am using the LocatorAutoCreate option which allows the user to hold Alt while clicking in order to create/remove locators. However, I need to be able to prevent ...
2
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1answer
57 views

Plotlabel in Monitor

I am using three For loops and would like to show a series of plots in the same window. I am using Monitor and I want to see the parameters in each plot. Here is my code: ...
7
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1answer
1k views

How can I get 'KeyDown' without writing 26 commands?

EventHandler and {"KeyDown","x"} work for registering a specific letter. Is there a direct way to return whichever letter keys ...
1
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1answer
33 views

Modifying this GoL implementation to make it sensible to clicks on the corner of the array

I'm interested in modifying this interactive implementation of the Game of Life http://demonstrations.wolfram.com/RealTimeSimulationOfTheGameOfLife/ to make it sensible to click events on the ...
3
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2answers
139 views

Plot with different line style when clicked

I have a plots with many lines and would like to be able to highlight lines when clicked (or on mouseover). When the data plotted is small this works well ...
13
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1answer
180 views

Visually permute rows of a matrix via mouse dragging

I'm looking for a way to permute the rows of a matrix visually via mouse dragging, for example by clicking and dragging on a row in the MatrixPlot corresponding to the matrix. What would be the best ...
1
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1answer
46 views

Why are changes to dynamic value not delivered to all GUI elements as they happen?

The widget below is just a toy that I put together so that I could ask this question. ...
12
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1answer
394 views

How to create Right-Click ActionMenu at mouse position?

I have a Grid and need to enable some actions on individual values. For this I want to use an ActionMenu that shows on right-...
5
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1answer
364 views

Response of Dynamic is slow

I wrote the following code to make an interactive GUI for Mathematica's Neural Network example of Digit Classification Here is the Code ...
4
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1answer
138 views

How to use an event handler inside of a Dialog Notebook

I am designing a tank game in Mathematica for my class and currently I have a tank that can drive along a curve and shoot a point at a set angle, but I want to get all of this into some sort of pup up ...
3
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2answers
163 views

How can I draw a variable number of dynamic, interactive objects, preserving their internal states?

Consider the following toy example: I have a "dynamical, interactive" graphics primitive like the following: ...
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0answers
92 views

Custom FrontEndToken calls

So I've been playing with FrontEndTokens recently and discovered that there are some of them that don't seem to have a standard-usage way of being called. For ...
1
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0answers
132 views

Making graphic objects disappear interactively

I am trying to create a program where dots on a plane disappear when an object passes over them. I am using EventHandler to code the arrow keys for control of the ...
1
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1answer
125 views

Very slow updates using LocatorPane [closed]

Making an app for conic sections I need that when point ptA is moved, point ptB shifts the same distance and in the same direction of ptA (i.e. a translation). This is the (simplified) code. ...
20
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1answer
3k views

How to draw an interactive, mouse clickable, 3D Bloch sphere?

A 3D Bloch (Poincaré) sphere is nicely shown in this wolfram demonstration. However, in that example, it is not possible to mouse select a point on the sphere and directly get the corresponding qubit ...
0
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0answers
67 views

How to implement multiple EventHandlers? [duplicate]

n00b Mathematica user here. I wrote this code: ...
0
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1answer
112 views

How to trigger an event whenever the variable controlled by an InputField is changed?

Consider an an InputField object of the form DynamicModule[{x = 0}, {InputField[Dynamic@x],Dynamic@stuffDependingOnx} ] ...
1
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2answers
139 views

How does EventHandler work inside a Graphic

I've created an application with the User Interface being a Graphic with lines, polygons etc. The functionality I need is: to be able to place the objects anywhere in {x,y} coords of the Graphic. to ...
4
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1answer
147 views

How to get what mouse button was pressed in EventHandler?

I'm trying to make an interface that (basically) records what mouse button was pressed inside the cell of a matrix. The code I have so far is ...
6
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2answers
142 views

Abort an EventHandler?

How do I stop an EventHandler? I'm trying to allow the user unlimited inputs on the arrow keys UNTIL certain conditions are met, and then stop the ...
3
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1answer
94 views

How to mimic CheckboxBar's Method->“Active” option in a Manipulate's checkbox control?

CheckboxBar has a Method -> "Active" option that allows you to click the label to change the state of a checkbox. I would ...
3
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1answer
445 views

How to Use Mouse Events & EventHandler in Demonstrations

One of the primary criteria for an acceptable Demonstration is, of course, that multiple copies of the Manipulate Output Cells [MOCs] have to have independent controls and datasets: the operation of ...
0
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1answer
184 views

How can I manually pick the data out of the image of a plot?

edit: The automatic way listed here doesn't work for an application like mine in which there are several curves on the same plot that all have the same markers, but you only want one curve (it will ...
8
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1answer
180 views

Docked cell showing keystrokes and mouse buttons actions

When I send bug reports to WRI, sometimes I attach a screen video record, like on the following example (that I just sent as an improvement suggestion). As you can see, I use OSD Hotkey, to make sure ...
5
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1answer
129 views

Triggering events based on choices made inside of system dialogs (e.g. window close)

I'm trying to arrange for Mathematica to perform a certain action every time a notebook is saved or closed (with or without saving). The obvious way to do this would be through event handling. So, ...
1
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1answer
136 views

How to update plot with EventHandler without using Print

Consider the following code: ...
3
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2answers
91 views

How to get highlighted text from event

I want to do the following: Given a text in a Mathematica dynamic module "at runtime". If some text is selected with the cursor/mouse, after the mouse button release, get the selected text. Thank ...
5
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1answer
79 views

Dynamically highlighting elements sharing common properties

I want to make a table of elements such that when the cursor is over a target element, all other elements of the table sharing some specified common property with the target are highlighted (let's say ...
1
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0answers
76 views

How can I perfect this game for Wolfram Demonstration publication? [closed]

When the messages change the window inactivates, and when I try to host an interactive CDF on my site it turns red and says something about numbers having to be scaled or offset. Any help? I'm ...
3
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0answers
46 views

EventHandler click event in Graphics[ ] object does not work properly after using Deploy [duplicate]

There is a problem clicking layered Graphics objects after using Deploy. For example, the code below works as intended with the Disk 'on top of' the Line. Click either object anywhere and EventHandler ...
1
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1answer
177 views
7
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1answer
360 views

What is “MouseDragged”?

Bug introduced in V10.1 or earlier and persisting through V11.3 Print is triggered just by pressing the mouse button. ...