| 套件 | spark.layouts |
| 類別 | public class HorizontalLayout |
| 繼承 | HorizontalLayout  LayoutBase OnDemandEventDispatcher Object |
| 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 position of the elements is determined by arranging them in a horizontal sequence, left to right, taking into account the padding before the first element and the gaps between the elements.
The vertical position of the elements is determined by the layout's
verticalAlign 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 the requestedColumnCount property is set to a value other than -1,
only the space for that many elements
is measured, starting from the first element.
During the execution of the updateDisplayList() method,
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
variableColumnWidthisfalse, then set the element's width to the value of thecolumnWidthproperty. - If the element's
percentWidthis set, then calculate the element's width by distributing the available container width between all elements withpercentWidthsetting. The available container width is equal to the container width minus the gaps, the padding and the space occupied by the rest of the elements. The element'sprecentWidthproperty is ignored when the layout is virtualized. - Set the element's width to its preferred width.
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 the
verticalAlignproperty is"justify", then set the element's height to the container height. - If the
verticalAlignproperty is"contentJustify", then set the element's height to the maximum between the container's height and all elements' preferred height. - If the element's
percentHeightproperty is set, then calculate the element's height as a percentage of the container's height. - Set the element's height to its preferred height.
顯示 MXML 語法
隱藏 MXML 語法The <s:HorizontalLayout> tag inherits all of the tag
attributes of its superclass and adds the following tag attributes:
<s:HorizontalLayout
Properties
columnWidth="calculated"
gap="6"
paddingBottom="0"
paddingLeft="0"
paddingRight="0"
paddingTop="0"
requestedColumnCount="-1"
requestedMaxColumnCount="-1"
requestedMinColumnCount="-1"
variableColumnWidth="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 | |
| columnCount : int [唯讀]
Returns the current number of elements in view. | HorizontalLayout | ||
| columnWidth : Number
If the variableColumnWidth property is false,
then this property specifies the actual width of each layout element, in pixels. | HorizontalLayout | ||
| 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 column that is part of the layout and within
the layout target's scroll rectangle, or -1 if nothing has been displayed yet. | HorizontalLayout | ||
| gap : int
The horizontal space between layout elements, in pixels. | HorizontalLayout | ||
| horizontalAlign : String
The horizontal alignment of the content relative to the container's width. | HorizontalLayout | ||
| 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 column that is part of the layout and within
the layout target's scroll rectangle, or -1 if nothing has been displayed yet. | HorizontalLayout | ||
| paddingBottom : Number
The minimum number of pixels between the container's bottom edge and
the bottom of all the container's layout elements. | HorizontalLayout | ||
| paddingLeft : Number
Number of pixels between the container's left edge
and the left edge of the first layout element. | HorizontalLayout | ||
| paddingRight : Number
Number of pixels between the container's right edge
and the right edge of the last layout element. | HorizontalLayout | ||
| paddingTop : Number
The minimum number of pixels between the container's top edge and
the top of all the container's layout elements. | HorizontalLayout | ||
| requestedColumnCount : int
The measured size of this layout is wide enough to display
the first requestedColumnCount layout elements. | HorizontalLayout | ||
| requestedMaxColumnCount : int
The measured width of this layout is large enough to display
at most requestedMaxColumnCount layout elements. | HorizontalLayout | ||
| requestedMinColumnCount : int
The measured width of this layout is large enough to display
at least requestedMinColumnCount layout elements. | HorizontalLayout | ||
| 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 | |
| variableColumnWidth : Boolean
If true, specifies that layout elements are to be allocated their
preferred width. | HorizontalLayout | ||
| verticalAlign : String
The vertical alignment of layout elements. | HorizontalLayout | ||
| 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. | HorizontalLayout | ||
| 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. | HorizontalLayout | ||
|
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 | |
columnCount | 屬性 |
columnWidth | 屬性 |
columnWidth: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 the variableColumnWidth property is false,
then this property specifies the actual width of each layout element, in pixels.
If the variableColumnWidth property is true,
the default, then this property has no effect.
The default value of this property is the preferred width
of the item specified by the typicalLayoutElement property.
實作
public function get columnWidth():Number public function set columnWidth(value:Number):voidfirstIndexInView | 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 column that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet. Note that the column 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
fractionOfElementInView
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 horizontal 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 the content relative to the container's width.
If the value is "left", "right", or "center" then the
layout element is aligned relative to the container's contentWidth property.
This property has no effect when clipAndEnableScrolling is true
and the contentWidth is greater than 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 column that is part of the layout and within the layout target's scroll rectangle, or -1 if nothing has been displayed yet. Note that the column 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 |
paddingBottom: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 |
The minimum number of pixels between the container's bottom edge and the bottom of all the container's layout elements.
預設值為 0。
實作
public function get paddingBottom():Number public function set paddingBottom(value:Number):voidpaddingLeft | 屬性 |
paddingRight | 屬性 |
paddingTop | 屬性 |
requestedColumnCount | 屬性 |
requestedColumnCount: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 wide enough to display
the first requestedColumnCount layout elements.
If requestedColumnCount is -1, then the measured
size will be big enough for all of the layout elements.
If the actual size of the container using this layout has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedColumnCount():int public function set requestedColumnCount(value:int):void相關 API 元素
requestedMaxColumnCount | 屬性 |
requestedMaxColumnCount: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 width of this layout is large enough to display
at most requestedMaxColumnCount layout elements.
If requestedColumnCount is set, then
this property has no effect.
If the actual size of the container using this layout has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedMaxColumnCount():int public function set requestedMaxColumnCount(value:int):void相關 API 元素
requestedMinColumnCount | 屬性 |
requestedMinColumnCount: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 width of this layout is large enough to display
at least requestedMinColumnCount layout elements.
If requestedColumnCount is set, then
this property has no effect.
If the actual size of the container using this layout has been explicitly set, then this property has no effect.
預設值為 -1。
實作
public function get requestedMinColumnCount():int public function set requestedMinColumnCount(value:int):void相關 API 元素
variableColumnWidth | 屬性 |
variableColumnWidth: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 |
If true, specifies that layout elements are to be allocated their
preferred width.
Setting this property to false specifies fixed width columns.
The actual width of each layout element is
the value of the columnWidth property, and the layout ignores
a layout elements' percentWidth property.
預設值為 true。
實作
public function get variableColumnWidth():Boolean public function set variableColumnWidth(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 layout elements.
If the value is "bottom", "middle",
or "top" then the layout elements are aligned relative
to the container's contentHeight property.
If the value is "contentJustify" then the actual
height of the layout element is set to
the container's contentHeight property.
The content height of the container is the height of the largest layout element.
If all layout elements are smaller than the height of the container,
then set the height of all the layout elements to the height of the container.
If the value is "justify" then the actual height
of the layout elements is set to the container's height.
If the value is "baseline" then the elements are positioned
such that their text is aligned to the maximum of the elements' text ascent.
預設值為 "top"。
實作
public function get verticalAlign():String public function set verticalAlign(value:String):voidHorizontalLayout | () | 建構函式 |
public function HorizontalLayout()| 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 horizontal 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 column.
|
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