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Sharing Data Among a GUI’s Callbacks
9-7
Sharing Data Among a GUI’s Callbacks
You can use GUI data, application data, and the UserData property to share
data among a GUI’s callbacks. This topic shows you how for each of these data
forms:
• “GUI Data” on page 9-7
• “Application Data” on page 9-9
• “UserData Property” on page 9-11
See “Mechanisms for Managing Data” on page 9-2 for general information
about these data forms.
GUI Data
GUI data, which is managed by the guidata function, is accessible to all
callbacks of the GUI. A callback for one component can set a value in GUI data
which can then be read by a callback for another component. See “GUI Data”
on page 9-2 for more information about GUI data.
GUI Data Example: Passing Data Between a Slider and an Edit Text Box
This example uses a GUI that contains a slider and an edit text box as shown
in the following figure. A static text instructs the user to enter a value or click
the slider. The example uses GUI data to initialize and maintain an error
counter.
- Version 7 1
- How to Contact The MathWorks: 2
- Revision History 3
- Saving and Running the GUI 9
- Contents 10
- Examples of GUIDE GUIs 11
- Functions for Creating GUIs 13
- Getting Started 15
- About GUIs in MATLAB 17
- 1 About GUIs in MATLAB 18
- How Does a GUI Work? 19
- Creating a GUI with 21
- 2 Creating a GUI with GUIDE 22
- The Example: Simple GUI 23
- Laying Out a Simple GUI 25
- OK. The Layout Editor then 25
- Adding the Components 27
- Aligning the Components 29
- Entering Pop-Up Menu Items 33
- , then click OK 35
- Saving the GUI Layout 37
- Programming the Pop-Up Menu 41
- Programming the Push Buttons 43
- Save from the File menu 45
- Creating a GUI 49
- Sine; result in radians 53
- Square root 53
- 3-D shaded surface plot 53
- Creating a GUI M-File 54
- Surf push button, add the 64
- Surf push button 64
- Mesh push button 64
- Contour push button, add the 64
- Running the Final GUI 65
- Creating GUIs with GUIDE 69
- What Is GUIDE? 71
- 4 What Is GUIDE? 72
- GUIDE Tools Summary 73
- Preferences and Options 77
- 5 Preferences and Options 78
- Prompt to Save on Activate 79
- All Other Preferences 81
- GUIDE Preferences 83
- GUI Options 85
- Generate FIG-File and M-File 87
- Generate FIG-File Only 89
- Laying Out a GUI 91
- Designing a GUI 93
- GUI with Uicontrols 97
- GUI with Axes and Menu 99
- 6 Laying Out a GUI 100
- Selecting a GUI Template 101
- Yes and No push buttons: 101
- Setting the GUI Size 103
- Adding Components to the GUI 105
- Preferences from 105
- Adding Text to the Components 115
- Static Text 117
- Slider, Axes, ActiveX Control 121
- Selecting Components 121
- Front-to-Back Positioning 123
- Dragging Components 125
- Resizing Components 127
- Aligning Components 129
- Property Inspector 131
- Guide Lines 133
- Setting Tab Order 135
- 1 Surf push button 137
- 2 Contour push button 137
- 3 Mesh push button 137
- Menus for the Menu Bar 139
- Adding Items to a Menu 141
- Additional Drop-Down Menus 143
- Cascading Menus 143
- Creating Menus 145
- UIContextMenu property 149
- Creating Toolbars 151
- Default System Font 153
- View menu 155
- Generate FIG-file 155
- Saving and Running the 159
- 7 Saving and Running the GUI 160
- File and GUI Names 161
- How to Assign Names 161
- Saving a GUI 163
- Saving a New GUI 165
- Saving an Existing GUI 167
- From an M-file Script 169
- M-file 171
- Programming the GUI 173
- 8 Programming the GUI 174
- Callbacks: An Overview 175
- GUI Files: An Overview 177
- View callbacks 179
- Callback Syntax and Arguments 183
- Input Arguments 185
- The Handles Structure 185
- Initialization Callbacks 187
- Output Function 189
- Push Button 191
- Radio Button 193
- Check Box 193
- List Box 195
- ActiveX Control 203
- View Callbacks from 205
- Menu Item 209
- View button 211
- Managing 213
- Application-Defined Data 213
- Mechanisms for Managing Data 214
- GUI Data in GUIDE 215
- Application Data 216
- UserData Property 218
- GUI Data 219
- 10 Examples of GUIDE GUIs 226
- Design of the GUI 227
- GUI Option Settings 229
- Plot Button Code Listing 231
- List Box Directory Reader 233
- The List Box Callback 237
- GUI M-file. See 239
- for more information 239
- Reading Workspace Variables 241
- Changing the Controller Gains 245
- Slider Callback 247
- Current value text box 249
- The GUI Help Button 253
- Running the GUI 257
- Validating the MAT-file 259
- The Open Menu Callback 261
- Open_Callback Code Listing 261
- An Address Book Reader 263
- Cancel from the question 263
- Paging Forward or Backward 265
- Code Listing 265
- Saving the MAT-File 267
- Save_Callback Code Listing 267
- Changing the Width 269
- Changing the Height 269
- How the GUI and Dialog Work 275
- Creating GUIs 277
- Programmatically 277
- Functions for Creating 279
- Introduction 280
- Function Summary 281
- ActiveX Controls 282
- Interactive User Input 282
- Working with Preferences 282
- Utilities 283
- Examples of GUIs Created 285
- The Example 287
- Creating the Data 289
- The Main Figure 290
- The Axes 291
- The Pop-Up Menu 292
- The Update Push Button 292
- File, and the items it 293
- The Toolbar and Its Tools 294
- Initializing the GUI 295
- Defining the Callbacks 296
- Open Menu Item Callback 297
- Print Menu Item Callback 298
- Close Menu Item Callback 298
- Color Palette 300
- The Components 301
- Using the Color Palette 301
- NaN, that 302
- View the Completed GUI M-File 303
- Subfunction Summary 304
- M-File Structure 305
- GUI Programming Techniques 306
- Sharing Data Between Two GUIs 308
- Icon Editor 311
- Using the Icon Editor 312
- Cancel button, its callback 317
- Making a GUI Modal 322
- UserData property 9-6 327
- Tag property 330
- UserData property 330
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