MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Specifications Page 155
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Interrupting Executing Callbacks
4-35
Interrupting Executing Callbacks
By default, MATLAB allows an executing callback to be interrupted by
subsequently invoked callbacks. For example, suppose you have created a
dialog box that displays a progress indicator while loading data. This dialog
could have a “Cancel” button that stops the loading operation. The “Cancel”
button’s callback routine would interrupt the currently executing callback
routine.
There are cases where you may not want user actions to interrupt an executing
callback. For example, a data analysis tool may need to perform lengthy
calculations before updating a graph. An impatient user may inadvertently
click the mouse on other components and thereby interrupt the calculations
while in progress. This could change the MATLAB state before returning to the
original callback.
The following sections provide more information on this topic:
• “Controlling Interruptibility”
• “The Event Queue”
• “Event Processing During Callback Execution”
Controlling Interruptibility
All graphics objects have an Interruptible property that determines whether
their callbacks can be interrupted. The default value is
on, which means that
callbacks can be interrupted. However, MATLAB checks the event queue only
when it encounters certain commands —
drawnow, figure, getframe, pause,
and,
waitfor. Otherwise, the callback continues to completion.
The Event Queue
MATLAB commands that perform calculations or assign values to properties
execute as they are encountered in the callback. However, commands or actions
that affect the state of the figure window generate events that are placed in a
queue. Events are caused by any command that causes the figure to be redrawn
or any user action, such as a button click or cursor movement, for which there
is a callback routine defined.
MATLAB processes the event queue only when the callback finishes execution
or when the callback contains the following commands:
- Version 7 1
- How to Contact The MathWorks: 2
- Contents 3
- Getting Started with 9
- 1 Getting Started with GUIDE 10
- Starting GUIDE 11
- The Layout Editor 13
- GUIDE Templates 15
- GUI FIG-Files and M-Files 17
- Programming the GUI M-file 19
- Creating a GUI 23
- 2 Creating a GUI 24
- Laying Out the GUI 25
- Add the Components 29
- Align the Components 31
- Name Property 33
- Programming the GUI 39
- % hObject handle to figure 43
- Surf push button callback: 45
- Mesh push button callback: 45
- Saving and Running a GUI 49
- Laying Out GUIs and 51
- Setting Properties 51
- Using GUIDE Templates 52
- Blank GUI 53
- GUI with Uicontrols 54
- GUI with Axes and Menu 55
- Modal Question Dialog 56
- Yes and No push buttons: 58
- Using the Layout Editor 59
- Layout Area 60
- Push Button 61
- Toggle Button 61
- Radio Button 61
- Check Box 61
- Edit Text 61
- Button Group 63
- ActiveX Component 63
- Adding an ActiveX Control 66
- Selecting Components 67
- Moving Components 67
- Saving the Layout 71
- Renaming GUI Files 71
- Layout Editor Preferences 72
- Displaying the GUI 72
- Layout Editor Context Menus 73
- Component Context Menus 74
- Selecting GUI Options 75
- Resize Behavior 76
- Command-Line Accessibility 77
- Access Options 78
- Generate FIG-File and M-File 79
- Naming Callback Subfunctions 80
- Callback Function Syntax 80
- Generate FIG-File Only 83
- Align Options 85
- Grids and Rulers 86
- Creating Guide Lines 87
- Front-to-Back Positioning 88
- Inspect Properties from the 90
- Some Commonly Used Properties 92
- Callback 93
- Setting List Box Properties 94
- Setting Slider Properties 95
- Callback Properties 101
- Changing a Tag 103
- Changing Callback Properties 103
- Creating a Menu 108
- Specifying Menu Properties 108
- Adding Items to a Menu 109
- Laying Out Three Menus 111
- Menu Callbacks 113
- Select All uimenu item 114
- Defining Context Menus 115
- New Menu Item 116
- UIContextMenu property 118
- 1 Surf push button 120
- 2 Contour push button 120
- 3 Mesh push button 120
- Programming GUIs 121
- 4 Programming GUIs 122
- Accessing GUI Data 123
- Output Function 125
- Input and Output Arguments 127
- Radio Buttons 129
- List Boxes 131
- Button Groups 133
- ActiveX Controls 137
- Layout Editor and select 139
- M-file Editor 141
- Application Data 149
- Specifying a Fixed-Width Font 151
- Using a Specific Font Name 151
- Types of Callbacks 153
- Controlling Interruptibility 155
- The Event Queue 155
- BusyAction 157
- Dismissing a Modal Figure 159
- GUI Applications 167
- 5 GUI Applications 168
- Design of the GUI 169
- GUI Option Settings 171
- Plot Button Code Listing 173
- List Box Directory Reader 175
- Loading the List Box 177
- Enabling Multiple Selection 183
- Running the GUI 187
- 'Value'); 189
- 'String',NewVal) 189
- Plotting the Results Data 193
- The GUI Help Button 195
- Closing the GUI 195
- An Address Book Reader 197
- Calling the GUI 199
- Check_And_Load Code Listing 201
- Storing and Retrieving Data 203
- Contact Name Callback 203
- Code Listing 205
- Save or Save As 207
- The Create New Menu 209
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