Xaml Xamarin,表格需要播放
我正在努力找出如何水平包装我的listview项目并填充listview中的可用空间 到目前为止,我的列表视图中的项目没有换行 XAML:Xaml Xamarin,表格需要播放,xaml,xamarin.forms,Xaml,Xamarin.forms,我正在努力找出如何水平包装我的listview项目并填充listview中的可用空间 到目前为止,我的列表视图中的项目没有换行 XAML: <Grid Grid.Row="4" Grid.RowSpacing="3" Grid.ColumnSpacing="3" BackgroundColor="Silver"> <ListView ItemsSource="{Binding EmployeeIds}" SelectedItem="{Binding SelectedEm
<Grid Grid.Row="4" Grid.RowSpacing="3" Grid.ColumnSpacing="3" BackgroundColor="Silver">
<ListView ItemsSource="{Binding EmployeeIds}" SelectedItem="{Binding SelectedEmployeeId}"
BackgroundColor="Black" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<customcontrols:WrapLayoutOld Orientation="Horizontal">
<Label Text="{Binding Value}" TextColor="Yellow" XAlign="Start" />
</customcontrols:WrapLayoutOld>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
using System;
using System.Linq;
using System.Collections.Generic;
using Xamarin.Forms;
namespace Custom.Controls
{
/// <summary>
/// New WrapLayout
/// </summary>
/// <author>Jason Smith</author>
public class WrapLayout : Layout<View>
{
Dictionary<View, SizeRequest> layoutCache = new Dictionary<View, SizeRequest>();
/// <summary>
/// Backing Storage for the Spacing property
/// </summary>
public static readonly BindableProperty SpacingProperty =
BindableProperty.Create<WrapLayout, double>(w => w.Spacing, 5,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayout)bindable).layoutCache.Clear());
/// <summary>
/// Spacing added between elements (both directions)
/// </summary>
/// <value>The spacing.</value>
public double Spacing
{
get { return (double)GetValue(SpacingProperty); }
set { SetValue(SpacingProperty, value); }
}
public WrapLayout()
{
VerticalOptions = HorizontalOptions = LayoutOptions.FillAndExpand;
}
protected override void OnChildMeasureInvalidated()
{
base.OnChildMeasureInvalidated();
layoutCache.Clear();
}
protected override SizeRequest OnSizeRequest(double widthConstraint, double heightConstraint)
{
double lastX;
double lastY;
var layout = NaiveLayout(widthConstraint, heightConstraint, out lastX, out lastY);
return new SizeRequest(new Size(lastX, lastY));
}
protected override void LayoutChildren(double x, double y, double width, double height)
{
double lastX, lastY;
var layout = NaiveLayout(width, height, out lastX, out lastY);
foreach (var t in layout)
{
var offset = (int)((width - t.Last().Item2.Right) / 2);
foreach (var dingus in t)
{
var location = new Rectangle(dingus.Item2.X + x + offset, dingus.Item2.Y + y, dingus.Item2.Width, dingus.Item2.Height);
LayoutChildIntoBoundingRegion(dingus.Item1, location);
}
}
}
private List<List<Tuple<View, Rectangle>>> NaiveLayout(double width, double height, out double lastX, out double lastY)
{
double startX = 0;
double startY = 0;
double right = width;
double nextY = 0;
lastX = 0;
lastY = 0;
var result = new List<List<Tuple<View, Rectangle>>>();
var currentList = new List<Tuple<View, Rectangle>>();
foreach (var child in Children)
{
SizeRequest sizeRequest;
if (!layoutCache.TryGetValue(child, out sizeRequest))
{
layoutCache[child] = sizeRequest = child.GetSizeRequest(double.PositiveInfinity, double.PositiveInfinity);
}
var paddedWidth = sizeRequest.Request.Width + Spacing;
var paddedHeight = sizeRequest.Request.Height + Spacing;
if (startX + paddedWidth > right)
{
startX = 0;
startY += nextY;
if (currentList.Count > 0)
{
result.Add(currentList);
currentList = new List<Tuple<View, Rectangle>>();
}
}
currentList.Add(new Tuple<View, Rectangle>(child, new Rectangle(startX, startY, sizeRequest.Request.Width, sizeRequest.Request.Height)));
lastX = Math.Max(lastX, startX + paddedWidth);
lastY = Math.Max(lastY, startY + paddedHeight);
nextY = Math.Max(nextY, paddedHeight);
startX += paddedWidth;
}
result.Add(currentList);
return result;
}
}
/// <summary>
/// Simple Layout panel which performs wrapping on the boundaries.
/// </summary>
public class WrapLayoutOld : Layout<View>
{
/// <summary>
/// Backing Storage for the Orientation property
/// </summary>
public static readonly BindableProperty OrientationProperty =
BindableProperty.Create<WrapLayoutOld, StackOrientation>(w => w.Orientation, StackOrientation.Vertical,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayoutOld)bindable).OnSizeChanged());
/// <summary>
/// Orientation (Horizontal or Vertical)
/// </summary>
public StackOrientation Orientation
{
get { return (StackOrientation)GetValue(OrientationProperty); }
set { SetValue(OrientationProperty, value); }
}
/// <summary>
/// Backing Storage for the Spacing property
/// </summary>
public static readonly BindableProperty SpacingProperty =
BindableProperty.Create<WrapLayoutOld, double>(w => w.Spacing, 6,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayoutOld)bindable).OnSizeChanged());
/// <summary>
/// Spacing added between elements (both directions)
/// </summary>
/// <value>The spacing.</value>
public double Spacing
{
get { return (double)GetValue(SpacingProperty); }
set { SetValue(SpacingProperty, value); }
}
/// <summary>
/// This is called when the spacing or orientation properties are changed - it forces
/// the control to go back through a layout pass.
/// </summary>
private void OnSizeChanged()
{
this.ForceLayout();
}
//http://forums.xamarin.com/discussion/17961/stacklayout-with-horizontal-orientation-how-to-wrap-vertically#latest
// protected override void OnPropertyChanged
// (string propertyName = null)
// {
// base.OnPropertyChanged(propertyName);
// if ((propertyName == WrapLayout.OrientationProperty.PropertyName) ||
// (propertyName == WrapLayout.SpacingProperty.PropertyName)) {
// this.OnSizeChanged();
// }
// }
/// <summary>
/// This method is called during the measure pass of a layout cycle to get the desired size of an element.
/// </summary>
/// <param name="widthConstraint">The available width for the element to use.</param>
/// <param name="heightConstraint">The available height for the element to use.</param>
protected override SizeRequest OnSizeRequest(double widthConstraint, double heightConstraint)
{
if (WidthRequest > 0)
widthConstraint = Math.Min(widthConstraint, WidthRequest);
if (HeightRequest > 0)
heightConstraint = Math.Min(heightConstraint, HeightRequest);
double internalWidth = double.IsPositiveInfinity(widthConstraint) ? double.PositiveInfinity : Math.Max(0, widthConstraint);
double internalHeight = double.IsPositiveInfinity(heightConstraint) ? double.PositiveInfinity : Math.Max(0, heightConstraint);
return Orientation == StackOrientation.Vertical
? DoVerticalMeasure(internalWidth, internalHeight)
: DoHorizontalMeasure(internalWidth, internalHeight);
}
/// <summary>
/// Does the vertical measure.
/// </summary>
/// <returns>The vertical measure.</returns>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
private SizeRequest DoVerticalMeasure(double widthConstraint, double heightConstraint)
{
int columnCount = 1;
double width = 0;
double height = 0;
double minWidth = 0;
double minHeight = 0;
double heightUsed = 0;
foreach (var item in Children)
{
var size = item.GetSizeRequest(widthConstraint, heightConstraint);
width = Math.Max(width, size.Request.Width);
var newHeight = height + size.Request.Height + Spacing;
if (newHeight > heightConstraint)
{
columnCount++;
heightUsed = Math.Max(height, heightUsed);
height = size.Request.Height;
}
else
height = newHeight;
minHeight = Math.Max(minHeight, size.Minimum.Height);
minWidth = Math.Max(minWidth, size.Minimum.Width);
}
if (columnCount > 1)
{
height = Math.Max(height, heightUsed);
width *= columnCount; // take max width
}
return new SizeRequest(new Size(width, height), new Size(minWidth, minHeight));
}
/// <summary>
/// Does the horizontal measure.
/// </summary>
/// <returns>The horizontal measure.</returns>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
private SizeRequest DoHorizontalMeasure(double widthConstraint, double heightConstraint)
{
int rowCount = 1;
double width = 0;
double height = 0;
double minWidth = 0;
double minHeight = 0;
double widthUsed = 0;
foreach (var item in Children)
{
var size = item.GetSizeRequest(widthConstraint, heightConstraint);
height = Math.Max(height, size.Request.Height);
var newWidth = width + size.Request.Width + Spacing;
if (newWidth > widthConstraint)
{
rowCount++;
widthUsed = Math.Max(width, widthUsed);
width = size.Request.Width;
}
else
width = newWidth;
minHeight = Math.Max(minHeight, size.Minimum.Height);
minWidth = Math.Max(minWidth, size.Minimum.Width);
}
if (rowCount > 1)
{
width = Math.Max(width, widthUsed);
height = (height + Spacing) * rowCount - Spacing; // via MitchMilam
}
return new SizeRequest(new Size(width, height), new Size(minWidth, minHeight));
}
/// <summary>
/// Positions and sizes the children of a Layout.
/// </summary>
/// <param name="x">A value representing the x coordinate of the child region bounding box.</param>
/// <param name="y">A value representing the y coordinate of the child region bounding box.</param>
/// <param name="width">A value representing the width of the child region bounding box.</param>
/// <param name="height">A value representing the height of the child region bounding box.</param>
protected override void LayoutChildren(double x, double y, double width, double height)
{
if (Orientation == StackOrientation.Vertical)
{
double colWidth = 0;
double yPos = y, xPos = x;
foreach (var child in Children.Where(c => c.IsVisible))
{
var request = child.GetSizeRequest(width, height);
double childWidth = request.Request.Width;
double childHeight = request.Request.Height;
colWidth = Math.Max(colWidth, childWidth);
if (yPos + childHeight > height)
{
yPos = y;
xPos += colWidth + Spacing;
colWidth = 0;
}
var region = new Rectangle(xPos, yPos, childWidth, childHeight);
LayoutChildIntoBoundingRegion(child, region);
yPos += region.Height + Spacing;
}
}
else {
double rowHeight = 0;
double yPos = y, xPos = x;
foreach (var child in Children.Where(c => c.IsVisible))
{
var request = child.GetSizeRequest(width, height);
double childWidth = request.Request.Width;
double childHeight = request.Request.Height;
rowHeight = Math.Max(rowHeight, childHeight);
if (xPos + childWidth > width)
{
xPos = x;
yPos += rowHeight + Spacing;
rowHeight = 0;
}
var region = new Rectangle(xPos, yPos, childWidth, childHeight);
LayoutChildIntoBoundingRegion(child, region);
xPos += region.Width + Spacing;
}
}
}
}
}
WrapLayout:
<Grid Grid.Row="4" Grid.RowSpacing="3" Grid.ColumnSpacing="3" BackgroundColor="Silver">
<ListView ItemsSource="{Binding EmployeeIds}" SelectedItem="{Binding SelectedEmployeeId}"
BackgroundColor="Black" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<customcontrols:WrapLayoutOld Orientation="Horizontal">
<Label Text="{Binding Value}" TextColor="Yellow" XAlign="Start" />
</customcontrols:WrapLayoutOld>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
using System;
using System.Linq;
using System.Collections.Generic;
using Xamarin.Forms;
namespace Custom.Controls
{
/// <summary>
/// New WrapLayout
/// </summary>
/// <author>Jason Smith</author>
public class WrapLayout : Layout<View>
{
Dictionary<View, SizeRequest> layoutCache = new Dictionary<View, SizeRequest>();
/// <summary>
/// Backing Storage for the Spacing property
/// </summary>
public static readonly BindableProperty SpacingProperty =
BindableProperty.Create<WrapLayout, double>(w => w.Spacing, 5,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayout)bindable).layoutCache.Clear());
/// <summary>
/// Spacing added between elements (both directions)
/// </summary>
/// <value>The spacing.</value>
public double Spacing
{
get { return (double)GetValue(SpacingProperty); }
set { SetValue(SpacingProperty, value); }
}
public WrapLayout()
{
VerticalOptions = HorizontalOptions = LayoutOptions.FillAndExpand;
}
protected override void OnChildMeasureInvalidated()
{
base.OnChildMeasureInvalidated();
layoutCache.Clear();
}
protected override SizeRequest OnSizeRequest(double widthConstraint, double heightConstraint)
{
double lastX;
double lastY;
var layout = NaiveLayout(widthConstraint, heightConstraint, out lastX, out lastY);
return new SizeRequest(new Size(lastX, lastY));
}
protected override void LayoutChildren(double x, double y, double width, double height)
{
double lastX, lastY;
var layout = NaiveLayout(width, height, out lastX, out lastY);
foreach (var t in layout)
{
var offset = (int)((width - t.Last().Item2.Right) / 2);
foreach (var dingus in t)
{
var location = new Rectangle(dingus.Item2.X + x + offset, dingus.Item2.Y + y, dingus.Item2.Width, dingus.Item2.Height);
LayoutChildIntoBoundingRegion(dingus.Item1, location);
}
}
}
private List<List<Tuple<View, Rectangle>>> NaiveLayout(double width, double height, out double lastX, out double lastY)
{
double startX = 0;
double startY = 0;
double right = width;
double nextY = 0;
lastX = 0;
lastY = 0;
var result = new List<List<Tuple<View, Rectangle>>>();
var currentList = new List<Tuple<View, Rectangle>>();
foreach (var child in Children)
{
SizeRequest sizeRequest;
if (!layoutCache.TryGetValue(child, out sizeRequest))
{
layoutCache[child] = sizeRequest = child.GetSizeRequest(double.PositiveInfinity, double.PositiveInfinity);
}
var paddedWidth = sizeRequest.Request.Width + Spacing;
var paddedHeight = sizeRequest.Request.Height + Spacing;
if (startX + paddedWidth > right)
{
startX = 0;
startY += nextY;
if (currentList.Count > 0)
{
result.Add(currentList);
currentList = new List<Tuple<View, Rectangle>>();
}
}
currentList.Add(new Tuple<View, Rectangle>(child, new Rectangle(startX, startY, sizeRequest.Request.Width, sizeRequest.Request.Height)));
lastX = Math.Max(lastX, startX + paddedWidth);
lastY = Math.Max(lastY, startY + paddedHeight);
nextY = Math.Max(nextY, paddedHeight);
startX += paddedWidth;
}
result.Add(currentList);
return result;
}
}
/// <summary>
/// Simple Layout panel which performs wrapping on the boundaries.
/// </summary>
public class WrapLayoutOld : Layout<View>
{
/// <summary>
/// Backing Storage for the Orientation property
/// </summary>
public static readonly BindableProperty OrientationProperty =
BindableProperty.Create<WrapLayoutOld, StackOrientation>(w => w.Orientation, StackOrientation.Vertical,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayoutOld)bindable).OnSizeChanged());
/// <summary>
/// Orientation (Horizontal or Vertical)
/// </summary>
public StackOrientation Orientation
{
get { return (StackOrientation)GetValue(OrientationProperty); }
set { SetValue(OrientationProperty, value); }
}
/// <summary>
/// Backing Storage for the Spacing property
/// </summary>
public static readonly BindableProperty SpacingProperty =
BindableProperty.Create<WrapLayoutOld, double>(w => w.Spacing, 6,
propertyChanged: (bindable, oldvalue, newvalue) => ((WrapLayoutOld)bindable).OnSizeChanged());
/// <summary>
/// Spacing added between elements (both directions)
/// </summary>
/// <value>The spacing.</value>
public double Spacing
{
get { return (double)GetValue(SpacingProperty); }
set { SetValue(SpacingProperty, value); }
}
/// <summary>
/// This is called when the spacing or orientation properties are changed - it forces
/// the control to go back through a layout pass.
/// </summary>
private void OnSizeChanged()
{
this.ForceLayout();
}
//http://forums.xamarin.com/discussion/17961/stacklayout-with-horizontal-orientation-how-to-wrap-vertically#latest
// protected override void OnPropertyChanged
// (string propertyName = null)
// {
// base.OnPropertyChanged(propertyName);
// if ((propertyName == WrapLayout.OrientationProperty.PropertyName) ||
// (propertyName == WrapLayout.SpacingProperty.PropertyName)) {
// this.OnSizeChanged();
// }
// }
/// <summary>
/// This method is called during the measure pass of a layout cycle to get the desired size of an element.
/// </summary>
/// <param name="widthConstraint">The available width for the element to use.</param>
/// <param name="heightConstraint">The available height for the element to use.</param>
protected override SizeRequest OnSizeRequest(double widthConstraint, double heightConstraint)
{
if (WidthRequest > 0)
widthConstraint = Math.Min(widthConstraint, WidthRequest);
if (HeightRequest > 0)
heightConstraint = Math.Min(heightConstraint, HeightRequest);
double internalWidth = double.IsPositiveInfinity(widthConstraint) ? double.PositiveInfinity : Math.Max(0, widthConstraint);
double internalHeight = double.IsPositiveInfinity(heightConstraint) ? double.PositiveInfinity : Math.Max(0, heightConstraint);
return Orientation == StackOrientation.Vertical
? DoVerticalMeasure(internalWidth, internalHeight)
: DoHorizontalMeasure(internalWidth, internalHeight);
}
/// <summary>
/// Does the vertical measure.
/// </summary>
/// <returns>The vertical measure.</returns>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
private SizeRequest DoVerticalMeasure(double widthConstraint, double heightConstraint)
{
int columnCount = 1;
double width = 0;
double height = 0;
double minWidth = 0;
double minHeight = 0;
double heightUsed = 0;
foreach (var item in Children)
{
var size = item.GetSizeRequest(widthConstraint, heightConstraint);
width = Math.Max(width, size.Request.Width);
var newHeight = height + size.Request.Height + Spacing;
if (newHeight > heightConstraint)
{
columnCount++;
heightUsed = Math.Max(height, heightUsed);
height = size.Request.Height;
}
else
height = newHeight;
minHeight = Math.Max(minHeight, size.Minimum.Height);
minWidth = Math.Max(minWidth, size.Minimum.Width);
}
if (columnCount > 1)
{
height = Math.Max(height, heightUsed);
width *= columnCount; // take max width
}
return new SizeRequest(new Size(width, height), new Size(minWidth, minHeight));
}
/// <summary>
/// Does the horizontal measure.
/// </summary>
/// <returns>The horizontal measure.</returns>
/// <param name="widthConstraint">Width constraint.</param>
/// <param name="heightConstraint">Height constraint.</param>
private SizeRequest DoHorizontalMeasure(double widthConstraint, double heightConstraint)
{
int rowCount = 1;
double width = 0;
double height = 0;
double minWidth = 0;
double minHeight = 0;
double widthUsed = 0;
foreach (var item in Children)
{
var size = item.GetSizeRequest(widthConstraint, heightConstraint);
height = Math.Max(height, size.Request.Height);
var newWidth = width + size.Request.Width + Spacing;
if (newWidth > widthConstraint)
{
rowCount++;
widthUsed = Math.Max(width, widthUsed);
width = size.Request.Width;
}
else
width = newWidth;
minHeight = Math.Max(minHeight, size.Minimum.Height);
minWidth = Math.Max(minWidth, size.Minimum.Width);
}
if (rowCount > 1)
{
width = Math.Max(width, widthUsed);
height = (height + Spacing) * rowCount - Spacing; // via MitchMilam
}
return new SizeRequest(new Size(width, height), new Size(minWidth, minHeight));
}
/// <summary>
/// Positions and sizes the children of a Layout.
/// </summary>
/// <param name="x">A value representing the x coordinate of the child region bounding box.</param>
/// <param name="y">A value representing the y coordinate of the child region bounding box.</param>
/// <param name="width">A value representing the width of the child region bounding box.</param>
/// <param name="height">A value representing the height of the child region bounding box.</param>
protected override void LayoutChildren(double x, double y, double width, double height)
{
if (Orientation == StackOrientation.Vertical)
{
double colWidth = 0;
double yPos = y, xPos = x;
foreach (var child in Children.Where(c => c.IsVisible))
{
var request = child.GetSizeRequest(width, height);
double childWidth = request.Request.Width;
double childHeight = request.Request.Height;
colWidth = Math.Max(colWidth, childWidth);
if (yPos + childHeight > height)
{
yPos = y;
xPos += colWidth + Spacing;
colWidth = 0;
}
var region = new Rectangle(xPos, yPos, childWidth, childHeight);
LayoutChildIntoBoundingRegion(child, region);
yPos += region.Height + Spacing;
}
}
else {
double rowHeight = 0;
double yPos = y, xPos = x;
foreach (var child in Children.Where(c => c.IsVisible))
{
var request = child.GetSizeRequest(width, height);
double childWidth = request.Request.Width;
double childHeight = request.Request.Height;
rowHeight = Math.Max(rowHeight, childHeight);
if (xPos + childWidth > width)
{
xPos = x;
yPos += rowHeight + Spacing;
rowHeight = 0;
}
var region = new Rectangle(xPos, yPos, childWidth, childHeight);
LayoutChildIntoBoundingRegion(child, region);
xPos += region.Width + Spacing;
}
}
}
}
}
使用系统;
使用System.Linq;
使用System.Collections.Generic;
使用Xamarin.Forms;
命名空间自定义控件
{
///
///新WraOut
///
///杰森·史密斯
公共类播放:布局
{
字典布局缓存=新建字典();
///
///间隔属性的备份存储
///
公共静态只读BindableProperty SpacingProperty=
BindableProperty.Create(w=>w.间距,5,
propertyChanged:(bindable,oldvalue,newvalue)=>((WrapLayout)bindable.layoutCache.Clear());
///
///元素之间添加的间距(两个方向)
///
///间距。
公共双间距
{
获取{return(double)GetValue(SpacingProperty);}
set{SetValue(SpacingProperty,value);}
}
公开播放
{
垂直选项=水平选项=LayoutOptions.FillAndExpand;
}
受保护的覆盖无效OnChildMeasureInvalidated()
{
base.OnChildMeasureInvalidated();
layoutCache.Clear();
}
受保护的覆盖SizeRequest OnSizeRequest(双宽度约束、双高度约束)
{
双拉丝;
双重整形术;
var layout=NaiveLayout(宽度约束、高度约束、out lastX、out lastY);
返回新尺寸请求(新尺寸(lastX,lastY));
}
受保护的替代无效布局子项(双x、双y、双宽度、双高度)
{
双lastX,lastY;
var layout=NaiveLayout(宽度、高度、外lastX、外lastY);
foreach(布局中的变量t)
{
变量偏移=(int)((宽度-t.Last().Item2.Right)/2);
foreach(t中的变量dingus)
{
变量位置=新矩形(dingus.Item2.X+X+偏移,dingus.Item2.Y+Y,dingus.Item2.Width,dingus.Item2.Height);
将子项布局到边界区域(dingus.ITEM 1,位置);
}
}
}
专用列表布局(双倍宽度、双倍高度、外双lastX、外双lastY)
{
双星tx=0;
双星=0;
右双=宽度;
双nextY=0;
lastX=0;
lastY=0;
var result=新列表();
var currentList=新列表();
foreach(儿童中的儿童变量)
{
SizereRequest SizereRequest;
如果(!layoutCache.TryGetValue(子项,out sizeRequest))
{
layoutCache[child]=sizeRequest=child.GetSizeRequest(double.PositiveInfinity,double.PositiveInfinity);
}
var paddedWidth=sizeRequest.Request.Width+间距;
var paddedHeight=sizeRequest.Request.Height+间距;
如果(开始发送+填充宽度>右侧)
{
startX=0;
startY+=nextY;
如果(currentList.Count>0)
{
结果.添加(当前列表);
currentList=新列表();
}
}
添加(新元组(子元组,新矩形(startX,startY,sizeRequest.Request.Width,sizeRequest.Request.Height));
lastX=数学最大值(lastX,startX+填充宽度);
lastY=数学最大值(lastY,startY+填充高度);
nextY=Math.Max(nextY,填充高度);
startX+=填充宽度;
}
结果.添加(当前列表);
返回结果;
}
}
///
///在边界上执行换行的简单布局面板。
///
公共类播放旧版:布局
{
///
///方向属性的备份存储
///
公共静态只读BindableProperty方向属性=
BindableProperty.Create(w=>w.Orientation,StackOrientation.Vertical,
propertyChanged:(bindable,oldvalue,newvalue)=>((WrapLayoutOld)bindable.OnSizeChanged());
///
///方向(水平或垂直)
///
公众导向
{
获取{return(StackOrientation)GetValue(OrientationProperty);}
set{SetValue(方向属性,值);}
}
///
///间隔属性的备份存储
///
公共静态只读BindableProperty SpacingProperty=
BindableProperty.Create(w=>w.间距,6,
propertyChanged:(bindable,oldvalue,newvalue)=>((WrapLayoutOld)bindable.OnSizeChanged());
///
///元素之间添加的间距(两个方向)
///
///间距。
公共双间距
{
获取{return(double)GetValue(SpacingProperty);}
set{SetValue(SpacingProperty,value);}
}
///
///当间距或方向属性发生更改时,将调用该属性-它将强制
///通过布局过程返回的控件。
///
私有void OnSizeChanged()
{
这是ForceLayout();
}
//http://forums.xamarin.com/discussion/17961/stacklayout-with-horizontal-orientation-how-to-wrap-vertically#latest
//受保护的覆盖无效OnPropertyChanged