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An Address Book Reader
5-43
catch
disp(lasterr);
end
end
Loading an Address Book Into the Reader
There are two ways in which an address book (i.e., a MAT-file) is loaded into
the GUI:
•When launching the GUI, you can specify a MAT-file as an argument. If you
do not specify an argument, the GUI loads the default address book
(
addrbook.mat).
•The user can select
Open under the File menu to browse for other MAT-files.
Validating the MAT-file
To be a valid address book, the MAT-file must contain a structure called
Addresses that has two fields called Name and Phone. The Check_And_Load
subfunction validates and loads the data with the following steps:
•Loads (
load) the specified file or the default if none is specified.
•Determines if the MAT-file is a valid address book.
•Displays the data if it is valid. If it is not valid, displays an error dialog
(
errordlg).
•Returns
1 for valid MAT-files and 0 if invalid (used by the Open menu
callback)
•Saves the following items in the
handles structure:
–The name of the MAT-file
–The
Addresses structure
–An index pointer indicating which name and phone number are currently
displayed
Check_And_Load Code Listing
This is the Check_And_Load function.
function pass = Check_And_Load(file,handles)
% Initialize the variable "pass" to determine if this is a valid file.
pass = 0;
- 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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