MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manuale Utente Pagina 19
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Step 11: API updates 19
Step 10: Binding
To make a user-defined variable bindable, you must now explicitly identify it by adding the
[Bindable] metadata tag to the property; for example:
[Bindable]
public var catalog:Array;
In addition, the <mx:Binding> tag must be moved to the top level. The following example
compiled in Flex 1.5:
<mx:HBox>
<mx:Label id="myLabel"/>
<mx:Label id="my2ndLabel" text="hello"/>
<mx:Binding source="my2ndLabel.text" destination="myLabel.text"/>
</mx:HBox>
In Flex 2, you must move the tag to the top level, as the following example shows:
<mx:Binding source="my2ndLabel.text" destination="myLabel.text"/>
<mx:HBox>
<mx:Label id="myLabel"/>
<mx:Label id="my2ndLabel" text="hello"/>
</mx:HBox>
For more information, see Chapter 5, “Binding”.
Step 11: API updates
The Flex ActionScript API has been updated to be more user-friendly. Changes include
enforcing proper capitalization, making class and property names clearer and more intuitive,
eliminating redundant classes and properties, and unifying common properties across
controls.
The following specific areas changed:
■ Event names. All event names and their constants were changed to present tense. For
example, the childAdded event is now childAdd, and its constant, CHILD_ADDED, is
now CHILD_ADD.
■ Camel-casing. Package, method, and property names now consistently use camel-case. For
example, the mx.containers.accordionclasses package name is now
mx.containers.accordionClasses.
■ Renderers. The terms cell, data, and row have been changed to item for renderers. For
example, cellFocusIn is now itemFocusIn, and the charting event mouseOverData is now
itemMouseOver.
- 4Contents 4
- Contents 5 5
- 6Contents 6
- About Flex Documentation 7
- Typographical conventions 8
- Getting Started 9
- Step 1: Find and replace 10
- Application namespace 11
- Color value formats 11
- Alpha and scale properties 12
- Event.currentTarget 12
- Uninitialized values 12
- Replace _root 13
- Step 2: Add access modifiers 14
- Step 3: Add types 15
- Step 4: Update events 16
- Step 7: Update data services 18
- Step 8: Charts 18
- Step 9: Overrides 18
- Step 10: Binding 19
- Step 11: API updates 19
- 20 Getting Started 20
- ActionScript 2.0 to 3.0 21
- Usability improvements 22
- Capitalization of identifiers 23
- Package reorganization 23
- Accessors 23
- Socket.isConnected property 24
- Classes and packages 25
- Using packages 26
- Using classes 27
- Using external files 28
- Initializing variables 29
- Default values 30
- About undefined 31
- Explicit typing 32
- Type detection 33
- Primitive types 33
- Non-assignment expressions 33
- Global functions 34
- Function changes 35
- Deprecated features 35
- Miscellaneous 36
- Metadata 37
- Constants 38
- Method signatures 38
- __proto__ 39
- Working with keys 40
- LocalConnection 40
- Flex Classes 41
- Core classes 42
- Member Change description 43
- The addEventHandler() method 50
- The load and unload events 51
- Validation and layout methods 51
- Drawing methods 51
- 52 Flex Classes 52
- Containers 53
- Controls 61
- dataTipOffset 77
- Flex 1.x: 79
- This class has been removed 87
- Formatters 89
- Managers 91
- Media controls 94
- Printing 94
- Resources 95
- Service tags 95
- Callback URLs 97
- Utilities 99
- 100 Flex Classes 100
- Data Providers 101
- 102 Data Providers 102
- 104 Data Providers 104
- About binding 105
- Binding from a property 106
- Binding from a property 107 107
- 108 Binding 108
- Binding from a property 109 109
- Binding with Arrays 110
- Contents 111
- About events 112
- Component startup life cycle 112
- Migrating the Event object 113
- Using static constants 114
- Using function listeners 115
- 116 Events 116
- Maintaining scope 117
- Using setCapture() 117
- Keyboard events 117
- 118 Events 118
- Styles and Skinning 119
- Using the StyleManager 120
- data-tip-offset 121
- CSS class selectors 122
- Global style sheet 123
- Using type selectors 123
- Using skinning 124
- Skinning assets 125
- Drawing programmatic skins 125
- Using embedded fonts 126
- Themes 127 127
- 128 Styles and Skinning 128
- Behaviors 129
- Overview 130
- New Behaviors syntax 131
- 132 Behaviors 132
- New Behaviors syntax 133 133
- New events for effect classes 134
- Data Services 135
- Proxy use policy 136
- Channels 136
- Unnamed RemoteObject 137
- Flex 1.5 syntax 138
- Flex 2 syntax 138
- Named RemoteObject 139
- Unnamed HTTPService 140
- Named HTTPService 142
- Unnamed WebService 143
- Named WebService 144
- Login commands 150
- RemoteObject 152
- Configuration and Command 153
- Line Tools 153
- Configuration files 154
- Security 155
- Command-line compilers 156
- SWD files 158
- Breakpoints 158
- Commands no longer supported 159
- Customizing Components 161
- Specifying the package 162
- Defining the class 162
- Defining the constructor 162
- Creating bindable properties 162
- Overriding a method 163
- Clip parameters removed 163
- Renamed invalidateStyle() 163
- 164 Customizing Components 164
- Additional Migration Issues 165
- Renderers 166
- Charting 167 167
- Interfaces 168
- Cell renderers 169
- Validators 170
- Deprecated item New item 171
- Embedding resources 172
- Migration Patterns 173
- Instantiating Flex controls 174
- Using mixins 175
- 176 Migration Patterns 176
- 178 Migration Patterns 178
- Other issues 180
- Setting actions 181
- Using Timer 182
- Accessing request data 183
- Using the Preloader 183
- 184 Migration Patterns 184
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