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Changing the height of the image

If you grab the thumb with the mouse and move it to the left or the right, two obvious visual effects occur. The first is that the value representedby the current position of the thumb is displayed above the thumb as shown in Figure 3.

(As you will see later, the value is also displayed in a Flex 4 application, but by default the appearance is white numerals on a blackbackground.)

Changing the height of the image.

Missing image.
Changing the height of the image.

The second visual effect

The second visual effect of moving the thumb is that the height of the image changes to the value represented by the position of the thumb on the slider.

(An Image object has a property named maintainAspectRatio . By default, the value of this propertyis true. Therefore, when the height is changed, the width changes in a proportional manner.)

Note that the upper-left corner of the image remains anchored to the same point as the height of the image changes as shown in Figure 3.

Discussion and sample code

The Flex 3 project named SliderChangeEvent 01

Creating the layout

Once you create your new Flex 3 Project, there are at least three ways that you can create your layout using Flex Builder 3:

  1. Select the Design tab in the upper-middle panel of the IDE (see Figure 5) and drag your containers, controls, and other components from the Components tab onto your design window.
  2. Select the Source tab in Figure 5 and write the raw XML code that defines your layout.
  3. A combination of 1 and 2 above

Expose the components tab

When you select the Design tab in the upper-middle window of the IDE, the lower-left window changes to the appearance shown in Figure 4 with theFlex 3 (mx) Components tab exposed.

Flex builder 3 components tab exposed.

Missing image.
Flex Builder 3 Components tab exposed.
The list of available components that you see in Figure 4 also appears when you create a new project in Flash Builder 4 and specify the use ofthe Flex 3 compiler.

A list of available components

Although they aren't all shown in Figure 4 due to space limitations, the Flex Builder 3 Components tab lists all of the components that you can use in your Flex application grouped into the following categories:

  • Custom
  • Controls
  • Layout
  • Navigators
  • Charts

Expose the design window

Selecting the Design tab mentioned above also exposes the Flex Builder 3 designwindow shown in Figure 5.

Drag controls onto the flex builder 3 design tab.

Missing image.
Drag controls onto the Flex Builder 3 Design tab.
A similar design window is exposed when you create a new project in Flash Builder 4 specifying the Flex 3 compiler and then select the Design tab. The purpose is the same but some of the items at the top of the design window in Flash Builder 4 are different.

Drag components onto the Design tab

You can drag components from the Components tab shown in Figure 4 onto the Design tab shown in Figure 5 to create your layout in the Flex Builder 3design mode or in the Flash Builder 4 design mode. As you do that, the corresponding XML code is automatically generated for you.

Questions & Answers

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Source:  OpenStax, Introduction to xml. OpenStax CNX. Dec 02, 2014 Download for free at https://legacy.cnx.org/content/col11207/1.18
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