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4 Programming GUIs
4-12
else
% Increment the error count, and display it
handles.numberOfErrors = handles.numberOfErrors+1;
set(handles.edit1,'String',...
[handles.errorString,num2str(handles.numberOfErrors)]);
guidata(gcbo,handles);
% store the changes
end
Saving the Handles Structure
You must use guidata to save the handles structure whenever you change
values in that structure. The statement,
guidata(gcbo,handles);
saves the current handles structure for the GUI figure.
Obtaining the Updated Handles Structure
There are cases where you must obtain an updated version of the handles
structure. You can do this with a call to
guidata:
handles = guidata(figure_handle);
where figure_handle is the handle of the GUI figure where the handles
structure is stored.
When Do You Need to Reload the Handles Structure
The handles structure follows the same scoping rules as any MATLAB
variable. If you modify it in a subfunction (e.g., a callback) and return to the
main function, you must reload the structure using
guidata.
Callbacks always load the current version of the
handles structure by passing
guidata(gcbo) as an argument.
If You Are Not Using a Handles Structure
If you are writing your own application M-file and are not generating a handles
structure, you can still use the GUI figure’s application data for storing any
data that you want to pass between subfunctions. This mechanism involves:
•Creating a structure containing the data you want to store.
•Storing the structure in the figure’s application data.
- Computation 1
- Visualization 1
- Programming 1
- How to Contact The MathWorks: 2
- Contents 3
- MATLAB GUIs 4
- GUIDE Layout Tools 5
- Getting Started with 9
- 1 Getting Started with GUIDE 10
- Show names in 11
- Getting Started Example 13
- View an Animated Demo 15
- 1. Set the GUI Figure Size 15
- 2. Add the Components 17
- 3. Align the Objects 18
- Push Buttons and Static Text 19
- Popup Menu Items 20
- Tag and Callback Properties 21
- 5. Activate the GUI 24
- The Application M-File 24
- Example – Testing the GUI 27
- 1. Add the File Menu 28
- 2. Set the Label and Tag 29
- 3. Add the Items 30
- File Menu Callback 32
- The Print Item Callback 33
- The Close Item Callback 33
- User Interface Controls 34
- Properties to Set 34
- Programming the Callback 34
- Toggle Buttons 35
- Radio Buttons 35
- Checkboxes 37
- Edit Text 37
- Designing a Slider 40
- Triggering Callback Execution 40
- Single or Multiple Selection 41
- Selection Type 41
- List Box Examples 42
- Programming the Popup Menu 43
- Plotting to Axes in GUIs 44
- GUIs with Multiple Axes 44
- Axes Callbacks 44
- 2 MATLAB GUIs 48
- Introduction 48
- Creating GUIs with GUIDE 49
- The Implementation of a GUI 49
- Updating Callbacks 52
- Resize Behavior 56
- Property Settings 56
- Command-Line Accessibility 58
- HandleVisibility – Callback 59
- HandleVisibility – Off 59
- HandleVisibility – On 59
- IntegerHandle 59
- The Generated M-File 61
- Naming Callback Subfunctions 61
- Callback Function Syntax 61
- Using Save As 67
- Getting Everything Right 67
- Avoiding Problems 68
- <automatic> to 69
- Closebutton_Callback 69
- GUI Layout Tools 72
- Activating the Figure 75
- Figure Context Menus 77
- GUI Component Context Menus 78
- Align Options 81
- Distribute Options 82
- Creating Guide Lines 83
- Layout menu 85
- Inspect Properties from the 87
- Creating a Menu 90
- Specifying Menu Properties 90
- Adding Items to the Menu 91
- Laying Out Three Menus 92
- Defining Context Menus 95
- Creating the Parent Menu 96
- Label and Tag properties 97
- UIContextMenu property 97
- Saving the GUI 99
- What a FIG-File Contains 99
- Handle Remapping 99
- 3 GUIDE Layout Tools 100
- Opening FIG-Files 100
- Programming GUIs 101
- 4 Programming GUIs 102
- GUI Programming Topics 102
- Callback property 105
- Opening the FIG-File 107
- Positioning the GUI Onscreen 108
- structure for 109
- Save the updated structure 111
- % store the changes 112
- Saving the Handles Structure 112
- Using the Default System Font 115
- Specifying a Fixed-Width Font 116
- Using a Specific Font Name 116
- System-Dependent Units 117
- Types of Callbacks 118
- Which Callback Executes 119
- Adding A Callback 119
- Using Modal Figure Windows 123
- Application Examples 125
- 5 Application Examples 126
- GUI with Multiple Axes 127
- Identifying the Axes 129
- Application Option Settings 130
- Getting User Input 131
- % Get user input from GUI 131
- Calculating Data 131
- Targeting Specific Axes 131
- Dialog Requirements 133
- Launching the Dialog 134
- Wait for User Input 134
- Making the Dialog Modal 135
- Launch the Dialog 137
- Executing a Callback 139
- Close button’s callback 141
- List Box Directory Reader 142
- Implementing the GUI 143
- Loading the List Box 145
- Opening Unknown File Types 147
- Reading Workspace Variables 149
- Enabling Multiple Selection 150
- Changing the Controller Gains 153
- Running the Simulation 153
- Plotting the Results 154
- Removing Results 154
- Application Options Settings 154
- Slider Callback 155
- Plotting the Results Data 159
- The GUI Help Button 161
- An Address Book Reader 164
- Validating the MAT-file 167
- Check_And_Load Code Listing 167
- The Contact Name Callback 169
- The Contact Phone # Callback 171
- Paging Forward or Backward 173
- Code Listing 173
- The Create New Menu 175
- Changing the Width 176
- Changing the Height 176
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