DataGridHeader  - AS3 Flex

The offset, in pixels, from the bottom of the content of the renderer.

The cached header height, in pixels.

The cached padding for the bottom of the renderer, in pixels.

The cached padding for the top of the renderer, in pixels.

The DataGrid control associated with this renderer.

Whether the component can accept user interaction. After setting the enabled property to false, some components still respond to mouse interactions such as mouseOver. As a result, to fully disable UIComponents, you should also set the value of the mouseEnabled property to false. If you set the enabled property to false for a container, Flex dims the color of the container and of all of its children, and blocks user input to the container and to all of its children.

An Array of header renderer instances.

The offset, in pixels, from the left side of the content of the renderer.

Whether we need the separator on the far right

Whether we need the separator events on the far right

The offset, in pixels, from the right side of the content of the renderer.

The offset, in pixels, from the top of the content of the renderer.

Constructor.

Removes column header separators that the user normally uses to resize columns.

Create child objects of the component. This is an advanced method that you might override when creating a subclass of UIComponent.

A component that creates other components or objects within it is called a composite component. For example, the Flex ComboBox control is actually made up of a TextInput control to define the text area of the ComboBox, and a Button control to define the ComboBox arrow. Components implement the createChildren() method to create child objects (such as other components) within the component.

From within an override of the createChildren() method, you call the addChild() method to add each child object.

You do not call this method directly. Flex calls the createChildren() method in response to the call to the addChild() method to add the component to its parent.

Draws the overlay on the dragged column into the given Sprite at the position, width and height specified using the color specified.

Parameters

Draws the background of the headers into the given UIComponent. The graphics drawn may be scaled horizontally if the component's width changes or this method will be called again to redraw at a different width and/or height

Parameters

Draws the highlight indicator into the given Sprite at the position, width and height specified using the color specified.

Parameters

Draws the selection indicator into the given Sprite at the position, width and height specified using the color specified.

Parameters

Creates and displays the column header separators that the user normally uses to resize columns. This implementation uses the same Sprite as the lines and column backgrounds and adds instances of the headerSeparatorSkin and attaches mouse listeners to them in order to know when the user wants to resize a column.

Calculates the default size, and optionally the default minimum size, of the component. This is an advanced method that you might override when creating a subclass of UIComponent.

You do not call this method directly. Flex calls the measure() method when the component is added to a container using the addChild() method, and when the component's invalidateSize() method is called.

When you set a specific height and width of a component, Flex does not call the measure() method, even if you explicitly call the invalidateSize() method. That is, Flex only calls the measure() method if the explicitWidth property or the explicitHeight property of the component is NaN.

In your override of this method, you must set the measuredWidth and measuredHeight properties to define the default size. You can optionally set the measuredMinWidth and measuredMinHeight properties to define the default minimum size.

Most components calculate these values based on the content they are displaying, and from the properties that affect content display. A few components simply have hard-coded default values.

The conceptual point of measure() is for the component to provide its own natural or intrinsic size as a default. Therefore, the measuredWidth and measuredHeight properties should be determined by factors such as:

• The amount of text the component needs to display.
• The styles, such as fontSize, for that text.
• The size of a JPEG image that the component displays.
• The measured or explicit sizes of the component's children.
• Any borders, margins, and gaps.

In some cases, there is no intrinsic way to determine default values. For example, a simple GreenCircle component might simply set measuredWidth = 100 and measuredHeight = 100 in its measure() method to provide a reasonable default size. In other cases, such as a TextArea, an appropriate computation (such as finding the right width and height that would just display all the text and have the aspect ratio of a Golden Rectangle) might be too time-consuming to be worthwhile.

The default implementation of measure() sets measuredWidth, measuredHeight, measuredMinWidth, and measuredMinHeight to 0.

Draws the sort arrow graphic on the column that is the current sort key. This implementation creates or reuses an instance of the skin specified by sortArrowSkin style property and places it in the appropriate column header. It also shrinks the size of the column header if the text in the header would be obscured by the sort arrow.

Draws the object and/or sizes and positions its children. This is an advanced method that you might override when creating a subclass of UIComponent.

You do not call this method directly. Flex calls the updateDisplayList() method when the component is added to a container using the addChild() method, and when the component's invalidateDisplayList() method is called.

If the component has no children, this method is where you would do programmatic drawing using methods on the component's Graphics object such as graphics.drawRect().

If the component has children, this method is where you would call the move() and setActualSize() methods on its children.

Components can do programmatic drawing even if they have children. In doing either, use the component's unscaledWidth and unscaledHeight as its bounds.

It is important to use unscaledWidth and unscaledHeight instead of the width and height properties.

Parameters