<< Chapter < Page Chapter >> Page >

No drag-and-drop support for hybrid projects

Another ramification of the fact that the components in Figure 8 are spark components is that you cannot create hybrid projects using drag-and-dropprogramming alone. If you drag the components in Figure 8 into the design pane of Flash Builder 4, your project will be populated with Flex 4 spark components.If you want the project to be populated with Flex 3 mx components, you will have to manually edit the mxml code to accomplish that. That may be another reason toavoid hybrid projects.

Drag-and-drop results

Figure 9 shows the results of dragging one VGroup layout, two Label controls, one HSlider control, and one Image control from the Flash Builder 4 Components panel into the Design panel.

Drag controls onto the flash builder 4 design tab.

Missing image.
Drag controls onto the Flash Builder 4 Design tab.

Compare Figure 9 with Figure 5 to see the differences in background color and layout.

Mxml code for the layout shown in Figure 9

Listing 5 shows the Flex 4 mxml code that corresponds to the layout shown in Figure 9.

Mxml code for the layout shown in figure 9.

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"><fx:Declarations><!-- Place non-visual elements (e.g., services, value objects) here --></fx:Declarations><s:VGroup x="0" y="0" width="200" height="200"><s:Label text="Label"/><s:Label text="Label"/><s:HSlider/><mx:Image/></s:VGroup></s:Application>

Mostly Flex 4 spark components

The most important thing to note about Listing 5 is that the VGroup , Label , and HSlider components that were dragged from the Component tab shown in Figure 8 into the Design panel shown in Figure 9 are all declared using the spark (s) namespace. Curiously, however, the Image control shows up in the code as mx:Image instead of s:Image .

The Flex 4 project named SliderChangeEvent03

Updating the mxml code in Listing 5 by applying the properties from Listing 7 to the Label and HSlider components produces the complete Flex 4 project named SliderChangeEvent03 shown in Listing 8.

If you run the online versions of SliderChangeEvent0 2 and SliderChangeEvent03 side-by-side in different browser windows, you will probably notice a fewsubtle differences in the look and feel of the two programs. Here are some of the differences that I have noticed:

  • There is less space between the labels and the slider in the Flex 4 version.
  • There is less space between the edge of the Flash window and the top and left ends of the labels and the slider in the Flex 4 version.
  • The overall length of the slider is shorter in the Flex 4 version.
  • The treatment of the little popup window that shows the value of the slider is different between the two. It has black letters on a cream-coloredbackground in the hybrid version as in Figure 3, but it has white letters on a black background in the Flex 4 version.

Run the programs

I encourage you to run the online versions of the programs from this lesson. Then copy the code from Listing 6, Listing 7, andListing 8. Use that code to create Flex projects of your own. Compile and run your projects. Experiment with the code,making changes, and observing the results of your changes. Make certain that you can explain why your changes behave as they do.


I will publish a list containing links to Flex resources as a separate document. Search for FlexResources in the Connexions search box.

Complete program listing

Complete listings of the programs discussed in this lesson are shown in Listing 6, Listing 7, and Listing 8 below.

Complete listing of sliderchangeevent01.

<?xml version="1.0" encoding="utf-8"?><!-- SliderChangeEvent01Illustrates the use of inline event handling for slider change events.--><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"><mx:Label text="Put your name here" fontSize="16" fontWeight="bold"/><mx:Label text="Image Height in Pixels" fontWeight="bold" fontSize="14"/><mx:HSlider minimum="100" maximum="250" value="250" toolTip="Height"change="myimg.height=event.currentTarget.value" liveDragging="true" /><mx:Image id="myimg" source="@Embed('myimage.jpg')" height="250"></mx:Image></mx:Application>

Complete listing of sliderchangeevent02.

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"><s:VGroup><mx:Label text="Put your name here" fontSize="16"fontWeight="bold"/><mx:Label text="Image Height in Pixels"fontWeight="bold" fontSize="14"/><mx:HSlider minimum="100"maximum="250" value="250"toolTip="Height" change="myimg.height=event.currentTarget.value"liveDragging="true" /><mx:Image id="myimg" source="@Embed('myimage.jpg')"height="250"></mx:Image></s:VGroup></s:Application>

Complete listing of sliderchangeevent03.

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"><s:VGroup x="0" y="0" width="200" height="200"><s:Label text="Put your name here" fontSize="16"fontWeight="bold"/><s:Label text="Image Height in Pixels"fontWeight="bold" fontSize="14"/><s:HSlider minimum="100"maximum="250" value="250"toolTip="Height" change="myimg.height=event.currentTarget.value"liveDragging="true" /><mx:Image id="myimg" source="@Embed('myimage.jpg')" height="250"/></s:VGroup></s:Application>


Housekeeping material
  • Module name: Handling Slider Change Events in Flex 3 and Flex 4
  • Files:
    • Flex0104\Flex0104.htm
    • Flex0104\Connexions\FlexXhtml0104.htm
PDF disclaimer: Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.


Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
I'm not good at math so would you help me
what is the problem that i will help you to self with?
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Introduction to xml' conversation and receive update notifications?