ProgrammaticSkin  - AS3 Flex

A flag that determines if an object has been through all three phases of layout: commitment, measurement, and layout (provided that any were required).

The measured height of this object. This should be overridden by subclasses to return the preferred height for the skin.

The measured width of this object. This should be overridden by subclasses to return the preferred width for the skin.

Depth of this object in the containment hierarchy. This number is used by the measurement and layout code. The value is 0 if this component is not on the DisplayList.

Set to true after immediate or deferred child creation, depending on which one happens. For a Container object, it is set to true at the end of the createComponentsFromDescriptors() method, meaning after the Container object creates its children from its child descriptors.

For example, if an Accordion container uses deferred instantiation, the processedDescriptors property for the second pane of the Accordion container does not become true until after the user navigates to that pane and the pane creates its children. But, if the Accordion had set the creationPolicy property to "all", the processedDescriptors property for its second pane is set to true during application startup.

For classes that are not containers, which do not have descriptors, it is set to true after the createChildren() method creates any internal component children.

A parent component used to obtain style values. This is typically set to the component that created this skin.

A flag that determines if an object has been through all three phases of layout validation (provided that any were required).

Constructor.

Programatically draws a rectangle into this skin's Graphics object.

The rectangle can have rounded corners. Its edges are stroked with the current line style of the Graphics object. It can have a solid color fill, a gradient fill, or no fill. A solid fill can have an alpha transparency. A gradient fill can be linear or radial. You can specify up to 15 colors and alpha values at specified points along the gradient, and you can specify a rotation angle or transformation matrix for the gradient. Finally, the rectangle can have a rounded rectangular hole carved out of it.

This versatile rectangle-drawing routine is used by many skins. It calls the drawRect() or drawRoundRect() methods (in the flash.display.Graphics class) to draw into this skin's Graphics object.

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相關 API 元素

Returns the value of the specified style property.

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Utility function to create a horizontal gradient matrix.

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Marks a component so that its updateDisplayList() method gets called during a later screen update.

Invalidation is a useful mechanism for eliminating duplicate work by delaying processing of changes to a component until a later screen update. For example, if you want to change the width and height, it would be wasteful to update the component immediately after you change the width and then update again with the new height. It is more efficient to change both properties and then render the component with its new size once.

Invalidation methods rarely get called. In general, setting a property on a component automatically calls the appropriate invalidation method.

Calling this method results in a call to the component's validateProperties() method before the display list is rendered.

For components that extend UIComponent, this implies that commitProperties() is called.

Calling this method results in a call to the component's validateSize() method before the display list is rendered.

For components that extend UIComponent, this implies that measure() is called, unless the component has both explicitWidth and explicitHeight set.

Moves this object to the specified x and y coordinates.

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Utility function to create a rotated gradient matrix.

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Sets the height and width of this object.

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Whenever any style changes, redraw this skin. Subclasses can override this method and perform a more specific test before calling invalidateDisplayList().

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Programmatically draws the graphics for this skin.

Subclasses should override this method and include calls to methods such as graphics.moveTo() and graphics.lineTo().

This occurs before any scaling from sources such as user code or zoom effects. The component is unaware of the scaling that takes place later.

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更多範例

This function is called by the LayoutManager when it's time for this control to draw itself. The actual drawing happens in the updateDisplayList function, which is called by this function.

Validate and update the properties and layout of this object and redraw it, if necessary.

This function is an empty stub so that ProgrammaticSkin can implement the ILayoutManagerClient interface. Skins do not call LayoutManager.invalidateProperties(), which would normally trigger a call to this method.

This function is an empty stub so that ProgrammaticSkin can implement the ILayoutManagerClient interface. Skins do not call LayoutManager.invalidateSize(), which would normally trigger a call to this method.

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Utility function to create a vertical gradient matrix.

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