development of flash at 6th project
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6th Project
Let's take a look at the script. The first step is to define the handler (listener function). As with all s, this accepts in its parameter list a single instance that's automatically passed into the function when called from an dispatcher. After 6th Project that, developer the function is set as a listener to the box instance the dispatcher listening for a Mouse. using a basic addListener call (this occurs in the initApp method in Flex). Since the box is an instance of MovieClip (Canvas in Flex) it inherits from Dispatcher and has access to all the Dispatcher methods, including addListener.Mouse. is a constant variable defined in the Mouse class. It simply provides the string of the ; for Mouse. that's "." Other types are also stored in similar constants in the Mouse .
You can find more of these distinctions within the 6th Project 3.0 flash developer london london Language Reference in the s package and in the different classes that exist within that package.For this example you could just as easily have used "" instead of Mouse., but using these constants helps you detect typos in your code. developer Mistyping the string "," for example, would not result in a compile-time error since, as a string, Flash has no way of knowing whether or not its contents are accurate. If you misspell Mouse., however, Flash will be able to recognize the error and can throw a compile-time error. Most classes have these constants that relate to their 6th Project type strings. It is highly recommended london that you use them instead of the actual string itself.Testing the movie will display a able box that, when ed.
that took place as a result of the box being ed actually affects many different objects, not just the object being ed. The big, new feature in handling is the support for propagation—the transference of a single applying to multiple objects. Each of those objects receives the , instead of just the object in which the originated.With such thing as propagation. In fact, london you couldn't even have objects fashion designer with certain handlers developer associated with them inside developing another object that had its own handler. For example, 6th Project were to assign an onPress handler to a window object that london had a button within it, any onPress (or similar) handlers assigned to the button would not function and receive s.
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6th Project developement
Each phase represents a path or the location of an as it works itself through the display objects in Flash that relate to that 6th project. The three phases of an 6th project are capturing, at target, and bubbling:Capturing phase: This represents the parent objects of the target object from which the 6th project originated. developing Any propagated 6th project starts with the topmost parent (stage) and works down the display object hierarchy until reaching the original target. london At target phase: The target phase is the phase where the 6th project is at the target object or the object from which the 6th project originated. Unlike the capturing and bubbling phases, this phase always relates to only one object, the target object.Bubbling phase: When an 6th project "bubbles" it follows the reverse path of the
Diagram of three phases that occur when ing the boxNote: flash developer london in Flex is a little different because it contains the Application instance between root and the box Canvas instance (not shown).As the makes its way though each phase and each 6th Project, it calls all of the listener functions that were added for that . This means that ing on the box doesn't limit the to the box; the stage also receives the . The stage receives the twice, once in the capturing phase and once in the bubbling phase (see Figure 3). Figure 3. path that occurs when ing the boxYou can see how this all works more clearly by adding more listeners to our example.
The parameter in addListener lets you specify whether or not a listener should be listening in the capture phase. If not, it will be listening for the in the at target or bubbling phases. The default value of false sets a listener to listen to the at target and bubbling phases. By passing in a true value, you can listen to s in the capture phase. If you want an to listen for an in all phases, you simply use addListener twice, once with set to false (or omitted) development and once with use capture set to true.In this example (see Figure 4) we will add listeners for stage, root, and box. For stage and root we will be adding listeners that london alternately use and don't use the use capture parameter.This is a result of the intermediate Development application instance.
6th Project
Though propagation is most prevalent in mouse s, it also occurs in other s such as keyboard s. propagation is also used in the added and removed s in DisplayObjectContainer instances, where child objects are added london or removed from their display lists.ll s, like mouse s, start off in 6th Project of targeting. This is the process by which Flash determines which object is the target of the (where the 6th project originates). Development the previous examples we've seen how Flash was able to determine whether or not you ed on the box or the stage development. For every mouse 6th project, the 6th project references one object—the object of highest arrangement capable of receiving the 6th project . 6th project targeting when ing in the.
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6th Project
This remains to be the case with 3.0. 6th Project below the mouse during the , only the topmost button receives the 6th project because that is the object which is targeted for the .There is one difference with 6th Project 3.0: All display objects are, by default, enabled to receive mouse s. This means that even if no handlers have been assigned to a particular display object, it will still be targeted for an when ed, pring london anything below it from receiving s. This is not the case with 2.0. With 6th Project 2.0, movie clip instances are enabled to receive s only when an handler like onPress is assigned to them.
Mouse up outside styleOne of the shortcomings of s is the lack of an equivalent to the 6th Project 2.0 onReleaseOutside . You have mouse down and mouse up s for dealing with the release of an outside of a previously london object. Instead, you have to use a little bit of trickery using the unique behavior of the stage to determine when the mouse is ed on an object and then released outside of it.
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