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13 Manage Callback Execution
13-2
Interrupt Callback Execution
In this section...
“How to Control Interruption” on page 13-2
“Callback Behavior When Interruption is Allowed” on page 13-2
“Example” on page 13-3
MATLAB lets you control whether or not a callback function can be interrupted while
it is executing. For instance, you can allow users to stop an animation loop by creating
a callback that interrupts the animation. At other times, you might want to prevent
potential interruptions, when the order of the running callback is important. For
instance, you might prevent interruptions for a WindowButtonMotionFcn callback that
shows different sections of an image.
How to Control Interruption
Callback functions execute according to their order in a queue. If a callback is executing
and a user action triggers a second callback, the second callback attempts to interrupt
the first callback. The first callback is the running callback. The second callback is the
interrupting callback.
Two property values control the response to an interruption attempt:
• The Interruptible property of the object owning the running callback determines if
interruption is allowed. A value of 'on' allows the interruption. A value of 'off'
does not allow the interruption. The default value is 'on'.
• If interruption is not allowed, then the BusyAction property (of the object owning the
interrupting callback) determines if MATLAB enqueues or discards the interrupting
callback. A value of 'queue' allows the interrupting callback to execute after the
running callback finishes execution. A value of 'cancel' discards the interrupting
callback. The default value is 'queue'.
Callback Behavior When Interruption is Allowed
When an object’s Interruptible property is set to 'on', its callback can be interrupted at
the next occurrence of one of these commands: drawnow, figure, getframe, waitfor,
or pause.
- How to Contact MathWorks 2
- Revision History 3
- Contents 5
- Create UIs with GUIDE 6
- What Is GUIDE? 6
- GUIDE Preferences and Options 6
- Lay Out a UI Using GUIDE 7
- Create UIs Programmatically 11
- Lay Out a Programmatic UI 11
- Code a Programmatic UI 12
- Manage Callback Execution 13
- Packaging GUIs as Apps 15
- Introduction to Creating UIs 17
- About UIs in MATLAB Software 19
- What Is a UI? 20
- What Is a UI? 21
- How Does a UI Work? 22
- Ways to Build MATLAB UIs 23
- How to Create a UI with GUIDE 25
- Set the Window Size in GUIDE 29
- Layout the Simple GUIDE UI 30
- Click OK 33
- simple_gui 40
- % Set the current data value 42
- mesh(handles.current_data); 46
- Files Generated by GUIDE 48
- Files Generated by GUIDE 49
- Callbacks” on page 8-5 51
- A Simple Programmatic UI 53
- 3 A Simple Programmatic UI 54
- GUIDE: Getting Started 70
- GUIDE Tools Summary 71
- 4 What Is GUIDE? 72
- GUIDE Preferences 74
- Prompt to Save on Activate 75
- All Other Preferences 76
- GUIDE Preferences 77
- GUIDE Options 80
- Resize Behavior 81
- Command-Line Accessibility 81
- GUIDE Options 83
- Generate FIG-File Only 84
- 1.4142 85
- GUIDE Templates 88
- Template Descriptions 89
- GUIDE Templates 91
- GUIDE Components 99
- 6 Lay Out a UI Using GUIDE 100
- GUIDE Components 101
- Place Components 103
- User Interface Controls 109
- Use the Table Property Editor 143
- Set Data Properties 149
- ActiveX Component 151
- Resize GUIDE UI Components 153
- Locate and Move Components 160
- Drag Components 161
- Locate and Move Components 163
- Align GUIDE UI Components 165
- Align GUIDE UI Components 167
- Grid and Rulers 171
- Create Menus for GUIDE UIs 177
- Create Menus for GUIDE UIs 179
- Context Menus 187
- Create Toolbars for GUIDE UIs 194
- Predefined Tools 199
- Custom Tools 199
- Standard Background Color 207
- UI Design References 209
- Save and Run a GUIDE UI 211
- Save a GUIDE UI 212
- Save a GUIDE UI 213
- 7 Save and Run a GUIDE UI 214
- Rename GUIDE UIs and Files 215
- Programming a GUIDE UI 217
- 8 Programming a GUIDE UI 218
- GUIDE Callback Syntax 221
- Opening Function 223
- Output Function 225
- How to Use the Example Code 227
- Radio Button 229
- Button Group 237
- Examples of GUIDE UIs 245
- Modal Dialog Box in GUIDE 248
- Modal Dialog Box in GUIDE 249
- 9 Examples of GUIDE UIs 250
- UI That Uses Persistent Data 253
- MAT-file Validation 255
- Overall UI Characteristics 263
- Plot Push Button Behavior 273
- Create Two Context Menus 289
- Related Examples 291
- Implement the List Box 293
- Read Workspace Variables 299
- About the Example 303
- Run the Program 305
- Design the 3-D Globe UI 315
- Inserted 323
- The Timer Implementation 327
- 10 Lay Out a Programmatic UI 334
- Programmatic Components 338
- Programmatic Components 339
- Lay Out a UI Programmatically 363
- Align Components 383
- Align Components Horizontally 385
- Use the uitoolbar Function 411
- Commonly Used Properties 411
- Default System Font 417
- Initialize a Programmatic UI 420
- 11 Code a Programmatic UI 422
- Callback Syntax 427
- Share Data Among Callbacks 430
- More About 438
- Interrupt Callback Execution 440
- Interrupt Callback Execution 441
- 13 Manage Callback Execution 442
- Examples of UIs Created 445
- Programmatically 445
- View the Example Code 447
- Initialize the UI 451
- Define the Callbacks 452
- Updating the Plot 455
- See Also 455
- Use the UI 466
- Program List Master 470
- Identify Component Handles 473
- Code File Organization 479
- UI Programming Techniques 480
- • “Find Apps” on page 15-2 483
- Find Apps 484
- View App File List 485
- Install or Reinstall App 487
- Uninstall App 488
- Apps Overview 492
- Why Create an App? 493
- 16 Packaging GUIs as Apps 494
- Package Apps 495
- Modify Apps 497
- Share Apps 498
- Dependency Analysis 500
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