| 套件 | spark.layouts |
| 類別 | public class VerticalLayout |
| 繼承 | VerticalLayout  LayoutBase OnDemandEventDispatcher Object |
| 子類別 | FormLayout |
| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The vertical position of the elements is determined by arranging them in a vertical sequence, top to bottom, taking into account the padding before the first element and the gaps between the elements.
The horizontal position of the elements is determined by the layout's
horizontalAlign property.
During the execution of the measure() method,
the default size of the container is calculated by
accumulating the preferred sizes of the elements, including gaps and padding.
When requestedRowCount is set, only the space for that many elements
is measured, starting from the first element.
During the execution of the updateDisplayList() method,
the height of each element is calculated
according to the following rules, listed in their respective order of
precedence (element's minimum height and maximum height are always respected):
- If
variableRowHeightisfalse, then set the element's height to the value of therowHeightproperty. - If the element's
percentHeightis set, then calculate the element's height by distributing the available container height between all elements with apercentHeightsetting. The available container height is equal to the container height minus the gaps, the padding and the space occupied by the rest of the elements. The element'sprecentHeightproperty is ignored when the layout is virtualized. - Set the element's height to its preferred height.
The width of each element is calculated according to the following rules, listed in their respective order of precedence (element's minimum width and maximum width are always respected):
- If
horizontalAlignis"justify", then set the element's width to the container width. - If
horizontalAlignis"contentJustify", then set the element's width to the maximum between the container's width and all elements' preferred width. - If the element's
percentWidthis set, then calculate the element's width as a percentage of the container's width. - Set the element's width to its preferred width.
顯示 MXML 語法
隱藏 MXML 語法The <s:VerticalLayout> tag inherits all of the tag
attributes of its superclass and adds the following tag attributes:
<s:VerticalLayout
Properties
gap="6"
horizontalAlign="left"
paddingBottom="0"
paddingLeft="0"
paddingRight="0"
paddingTop="0"
requestedMaxRowCount="-1"
requestedMinRowCount="-1"
requestedRowCount="-1"
rowHeight="calculated"
variableRowHeight="true"
verticalAlign="top"
/>
更多範例
Setting the layout of a Spark container
Setting the padding and gap of a layout
Setting the alignment of a layout
Setting the row height or column width of a layout
| 屬性 | 定義自 | ||
|---|---|---|---|
 | clipAndEnableScrolling : Boolean
If true, specifies to clip the children to the boundaries of the viewport. | LayoutBase | |
| constructor : Object
類別物件的參照或是特定物件實體的建構函數。 | Object | |
| dropIndicator : DisplayObject
The DisplayObject that this layout uses for
the drop indicator during a drag-and-drop operation. | LayoutBase | |
| firstIndexInView : int [唯讀]
The index of the first layout element that is part of the
layout and within the layout target's scroll rectangle, or -1
if nothing has been displayed yet. | VerticalLayout | ||
| gap : int
The vertical space between layout elements, in pixels. | VerticalLayout | ||
| horizontalAlign : String
The horizontal alignment of layout elements. | VerticalLayout | ||
| horizontalScrollPosition : Number
The x coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component. | LayoutBase | |
| lastIndexInView : int [唯讀]
The index of the last row that's part of the layout and within
the container's scroll rectangle, or -1 if nothing has been displayed yet. | VerticalLayout | ||
| paddingBottom : Number
Number of pixels between the container's bottom edge
and the bottom edge of the last layout element. | VerticalLayout | ||
| paddingLeft : Number
The minimum number of pixels between the container's left edge and
the left edge of the layout element. | VerticalLayout | ||
| paddingRight : Number
The minimum number of pixels between the container's right edge and
the right edge of the layout element. | VerticalLayout | ||
| paddingTop : Number
Number of pixels between the container's top edge
and the top edge of the first layout element. | VerticalLayout | ||
| requestedMaxRowCount : int
The measured height of this layout is large enough to display
at most requestedMaxRowCount layout elements. | VerticalLayout | ||
| requestedMinRowCount : int
The measured height of this layout is large enough to display
at least requestedMinRowCount layout elements. | VerticalLayout | ||
| requestedRowCount : int
The measured size of this layout is tall enough to display
the first requestedRowCount layout elements. | VerticalLayout | ||
| rowCount : int [唯讀]
The current number of visible elements. | VerticalLayout | ||
| rowHeight : Number
If variableRowHeight is false, then
this property specifies the actual height of each child, in pixels. | VerticalLayout | ||
| target : GroupBase
The GroupBase container whose elements are measured, sized and positioned
by this layout. | LayoutBase | |
| typicalLayoutElement : ILayoutElement
Used by layouts when fixed row/column sizes are requested but
a specific size isn't specified. | LayoutBase | |
| useVirtualLayout : Boolean
A container can hold any number of children. | LayoutBase | |
| variableRowHeight : Boolean
Specifies whether layout elements are allocated their
preferred height. | VerticalLayout | ||
| verticalAlign : String
The vertical alignment of the content relative to the container's height. | VerticalLayout | ||
| verticalScrollPosition : Number
The y coordinate of the origin of the viewport in the component's coordinate system,
where the default value is (0,0) corresponding to the upper-left corner of the component. | LayoutBase | |
| 方法 | 定義自 | ||
|---|---|---|---|
Constructor. | VerticalLayout | ||
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener
receives notification of an event. | OnDemandEventDispatcher | |
|
Calculates the drop location in the data provider of the drop target for
the specified dragEvent. | LayoutBase | |
|
When useVirtualLayout is true,
this method can be used by the layout target
to clear cached layout information when the target changes. | LayoutBase | |
|
Dispatches an event into the event flow. | OnDemandEventDispatcher | |
|
Called by the target after a layout element
has been added and before the target's size and display list are
validated. | LayoutBase | |
|
This method must is called by the target after a layout element
has been removed and before the target's size and display list are
validated. | LayoutBase | |
Returns 1.0 if the specified index is completely in view, 0.0 if
it's not, or a value between 0.0 and 1.0 that represents the percentage
of the if the index that is partially in view. | VerticalLayout | ||
|
Returns the specified element's layout bounds as a Rectangle or null
if the index is invalid, the corresponding element is null,
includeInLayout=false,
or if this layout's target property is null. | LayoutBase | |
|
Returns the change to the horizontal scroll position to handle
different scrolling options. | LayoutBase | |
| getNavigationDestinationIndex(currentIndex:int, navigationUnit:uint, arrowKeysWrapFocus:Boolean):int
Delegation method that determines which item
to navigate to based on the current item in focus
and user input in terms of NavigationUnit. | LayoutBase | |
|
Computes the verticalScrollPosition and
horizontalScrollPosition deltas needed to
scroll the element at the specified index into view. | LayoutBase | |
|
Returns the change to the vertical scroll position to handle
different scrolling options. | LayoutBase | |
|
Checks whether the EventDispatcher object has any listeners registered for a specific type
of event. | OnDemandEventDispatcher | |
|
指出物件是否有已定義的指定屬性。 | Object | |
|
Hides the previously shown drop indicator,
created by the showDropIndicator() method,
removes it from the display list and also stops the drag scrolling. | LayoutBase | |
|
指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。 | Object | |
|
Measures the target's default size based on its content, and optionally
measures the target's default minimum size. | LayoutBase | |
|
指出指定的屬性是否存在，以及是否可列舉。 | Object | |
|
Removes a listener from the EventDispatcher object. | OnDemandEventDispatcher | |
|
為迴圈作業設定動態屬性的可用性。 | Object | |
|
Sizes, positions and parents the drop indicator based on the specified
drop location. | LayoutBase | |
|
傳回代表此物件的字串，根據地區特定慣例進行格式化。 | Object | |
|
會傳回指定之物件的字串形式。 | Object | |
|
Sizes and positions the target's elements. | LayoutBase | |
|
Called by the target at the end of its updateDisplayList
to have the layout update its scrollRect. | LayoutBase | |
|
會傳回指定之物件的基本值。 | Object | |
|
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type. | OnDemandEventDispatcher | |
firstIndexInView | 屬性 |
firstIndexInView:int [唯讀] | 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The index of the first layout element that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet.
"Part of the layout" means that the element is non-null
and that its includeInLayout property is true.
Note that the layout element may only be partially in view.
此屬性可以做為資料繫結的來源。一旦修改此屬性，將傳送 indexInViewChanged 事件。
實作
public function get firstIndexInView():int相關 API 元素
gap | 屬性 |
gap:int| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The vertical space between layout elements, in pixels. Note that the gap is only applied between layout elements, so if there's just one element, the gap has no effect on the layout.
預設值為 6。
實作
public function get gap():int public function set gap(value:int):voidhorizontalAlign | 屬性 |
horizontalAlign:String| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The horizontal alignment of layout elements.
If the value is "left", "right", or "center" then the
layout element is aligned relative to the container's contentWidth property.
If the value is "contentJustify", then the layout element's actual
width is set to the contentWidth of the container.
The contentWidth of the container is the width of the largest layout element.
If all layout elements are smaller than the width of the container,
then set the width of all layout elements to the width of the container.
If the value is "justify" then the layout element's actual width
is set to the container's width.
This property does not affect the layout's measured size.
預設值為 "left"。
實作
public function get horizontalAlign():String public function set horizontalAlign(value:String):voidlastIndexInView | 屬性 |
lastIndexInView:int [唯讀] | 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The index of the last row that's part of the layout and within the container's scroll rectangle, or -1 if nothing has been displayed yet.
"Part of the layout" means that the child is non-null
and that its includeInLayout property is true.
Note that the row may only be partially in view.
此屬性可以做為資料繫結的來源。一旦修改此屬性，將傳送 indexInViewChanged 事件。
實作
public function get lastIndexInView():int相關 API 元素
fractionOfElementInView
paddingBottom | 屬性 |
paddingLeft | 屬性 |
paddingRight | 屬性 |
paddingTop | 屬性 |
requestedMaxRowCount | 屬性 |
requestedMaxRowCount:int| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4.5 |
| 執行階段版本: | Flash Player 10, AIR 2.5 |
The measured height of this layout is large enough to display
at most requestedMaxRowCount layout elements.
If requestedRowCount is set, then
this property has no effect.
If the actual size of the container has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedMaxRowCount():int public function set requestedMaxRowCount(value:int):void相關 API 元素
requestedMinRowCount | 屬性 |
requestedMinRowCount:int| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4.5 |
| 執行階段版本: | Flash Player 10, AIR 2.5 |
The measured height of this layout is large enough to display
at least requestedMinRowCount layout elements.
If requestedRowCount is set, then
this property has no effect.
If the actual size of the container has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedMinRowCount():int public function set requestedMinRowCount(value:int):void相關 API 元素
requestedRowCount | 屬性 |
requestedRowCount:int| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The measured size of this layout is tall enough to display
the first requestedRowCount layout elements.
If requestedRowCount is -1, then the measured
size will be big enough for all of the layout elements.
If the actual size of the container has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedRowCount():int public function set requestedRowCount(value:int):void相關 API 元素
rowCount | 屬性 |
rowHeight | 屬性 |
rowHeight:Number| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
If variableRowHeight is false, then
this property specifies the actual height of each child, in pixels.
If variableRowHeight is true,
the default, then this property has no effect.
The default value of this property is the preferred height
of the typicalLayoutElement.
實作
public function get rowHeight():Number public function set rowHeight(value:Number):voidvariableRowHeight | 屬性 |
variableRowHeight:Boolean| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
Specifies whether layout elements are allocated their
preferred height.
Setting this property to false specifies fixed height rows.
If false, the actual height of each layout element is
the value of rowHeight.
Setting this property to false causes the layout to ignore
the layout elements' percentHeight property.
預設值為 true。
實作
public function get variableRowHeight():Boolean public function set variableRowHeight(value:Boolean):voidverticalAlign | 屬性 |
verticalAlign:String| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
The vertical alignment of the content relative to the container's height.
If the value is "bottom", "middle",
or "top" then the layout elements are aligned relative
to the container's contentHeight property.
This property has no effect when clipAndEnableScrolling is true
and the contentHeight is greater than the container's height.
This property does not affect the layout's measured size.
預設值為 "top"。
實作
public function get verticalAlign():String public function set verticalAlign(value:String):voidVerticalLayout | () | 建構函式 |
public function VerticalLayout()| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
Constructor.
fractionOfElementInView | () | 方法 |
public function fractionOfElementInView(index:int):Number| 語言版本: | ActionScript 3.0 |
| 產品版本: | Flex 4 |
| 執行階段版本: | Flash Player 10, AIR 1.5 |
Returns 1.0 if the specified index is completely in view, 0.0 if it's not, or a value between 0.0 and 1.0 that represents the percentage of the if the index that is partially in view.
An index is "in view" if the corresponding non-null layout element is
within the vertical limits of the container's scrollRect
and included in the layout.
If the specified index is partially within the view, the returned value is the percentage of the corresponding layout element that's visible.
參數
index:int — The index of the row.
|
Number — The percentage of the specified element that's in view.
Returns 0.0 if the specified index is invalid or if it corresponds to
null element, or a ILayoutElement for which
the includeInLayout property is false.
|
Tue Jun 12 2018, 03:47 PM Z