我一直试图解决的一个看似简单的问题。我想要一个控件(或一些XAML布局magickry),其行为类似于网格,其中某些行的高度为*,但支持包裹列。地狱;称之为WrapGrid。 :)
这是一个可视化的模型。想象一下这样定义的网格:
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="400">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" MinHeight="30">I'm auto-sized.</Button>
<Button Grid.Row="1" MinHeight="90">I'm star-sized.</Button>
<Button Grid.Row="2" MinHeight="30">I'm auto-sized.</Button>
<Button Grid.Row="3" MinHeight="90">I'm star-sized, too!</Button>
<Button Grid.Row="4" MinHeight="30">I'm auto-sized.</Button>
<Button Grid.Row="5" MinHeight="30">I'm auto-sized.</Button>
</Grid>
</Window>
我想让这个面板做的是当项目不能小于minHeight时,将项目包装到一个附加列中。这是一个可怕的MSPaint,我做了一些详细说明这个过程的模型。
回想一下XAML,自动调整大小的按钮的minHeights为30,而星形按钮的minHeights为90.
这个模型只是两个并排的网格,我在设计器中手动移动了按钮。可以想象,这可以通过编程方式完成,并作为一种复杂的解决方案。
如何做到这一点?我会接受任何解决方案,无论是通过xaml还是有一些代码隐藏(尽管如果可能的话我会更喜欢纯XAML,因为后面的xaml代码在IronPython中更难实现)。
更新了赏金
我设法在我的IPy应用程序中找到了如何使用Meleak的解决方案:
1)我将WrapGridPanel.cs
编译成了一个带有csc
:
C:\Projects\WrapGridTest\WrapGridTest>csc /target:library "WrapGridPanel.cs" /optimize /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\PresentationFramework.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\PresentationCore.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\WindowsBase.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.Xaml.dll"
更新:添加了/optimize
开关,这样可以带来小幅提升
2)我使用以下行将它添加到我的应用程序的xaml中。
xmlns:local="clr-namespace:WrapGridTest;assembly=WrapGridPanel.dll"
这很好,但它打破了设计师。我还没有真正找到解决方法,它看起来是VS2010中的一个错误。因此,作为一种解决方法,为了能够使用设计器,我只是在运行时以编程方式添加WrapGridPanel:
clr.AddReference("WrapGridPanel.dll")
from WrapGridTest import WrapGridPanel
wgp = WrapGridPanel()
调整大小时效果不佳:
在我的IronPython应用程序中,调整包含此WrapGridPanel的窗口的大小是缓慢而棘手的。可以优化RecalcMatrix()
算法吗?或许可以不那么频繁地召唤它?正如尼古拉斯建议的那样,可能覆盖MeasureOverride
和ArrangeOverride
会表现得更好吗?
更新:根据VS2010 Instrumentation Profiler,RecalcMatrix()花费的时间的97%用于Clear()和Add()。就地修改每个元素将是一个巨大的性能改进。我自己也在抨击它,但修改其他人的代码总是很难... http://i.stack.imgur.com/tMTWU.png
如果您想尝试一下,这是我在XAML中实际应用程序UI的一部分的模型。 http://pastebin.com/2EWY8NS0
答案 0 :(得分:5)
<强>更新强>
优化RecalcMatrix
,以便只在需要时重建UI。除非必要,否则它不会触及UI,因此它应该更快。
再次更新
修复了使用Margin
您认为所看到的内容基本上是WrapPanel
水平方向,其中每个元素都是1列Grid
。然后,列中的每个元素都有一个对应的RowDefinition
,其中Height
属性与其子项上设置的附加属性("WrapHeight"
)匹配。该小组必须位于Grid
本身,Height="*"
和Width="Auto"
,因为儿童应该由可用的Height
定位,而不关心可用{{1} }}
我实现了这个,我称之为Width
。你可以像这样使用它
WrapGridPanel
<强> WrapGridPanel.cs 强>
<local:WrapGridPanel>
<Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto">I'm auto-sized.</Button>
<Button MinHeight="90" local:WrapGridPanel.WrapHeight="*">I'm star-sized.</Button>
<Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto">I'm auto-sized.</Button>
<Button MinHeight="90" local:WrapGridPanel.WrapHeight="*">I'm star-sized, too!</Button>
<Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto">I'm auto-sized.</Button>
<Button MinHeight="30" local:WrapGridPanel.WrapHeight="Auto">I'm auto-sized.</Button>
</local:WrapGridPanel>
<强>更新强>
修复了多个星级列问题
这里有新的示例应用:http://www.mediafire.com/?28z4rbd4pp790t2
<强>更新强>
试图解释[ContentProperty("WrapChildren")]
public class WrapGridPanel : Grid
{
private WrapPanel m_wrapPanel = new WrapPanel();
public WrapGridPanel()
{
ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1.0, GridUnitType.Auto) } );
RowDefinitions.Add(new RowDefinition { Height = new GridLength(1.0, GridUnitType.Star) } );
Children.Add(m_wrapPanel);
WrapChildren = new ObservableCollection<FrameworkElement>();
WrapChildren.CollectionChanged += WrapChildren_CollectionChanged;
DependencyPropertyDescriptor actualHeightDescriptor
= DependencyPropertyDescriptor.FromProperty(WrapGridPanel.ActualHeightProperty,
typeof(WrapGridPanel));
if (actualHeightDescriptor != null)
{
actualHeightDescriptor.AddValueChanged(this, ActualHeightChanged);
}
}
public static void SetWrapHeight(DependencyObject element, GridLength value)
{
element.SetValue(WrapHeightProperty, value);
}
public static GridLength GetWrapHeight(DependencyObject element)
{
return (GridLength)element.GetValue(WrapHeightProperty);
}
public ObservableCollection<FrameworkElement> WrapChildren
{
get { return (ObservableCollection<FrameworkElement>)base.GetValue(WrapChildrenProperty); }
set { base.SetValue(WrapChildrenProperty, value); }
}
void ActualHeightChanged(object sender, EventArgs e)
{
RecalcMatrix();
}
void WrapChildren_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
RecalcMatrix();
}
List<List<FrameworkElement>> m_elementList = null;
private bool SetupMatrix()
{
m_elementList = new List<List<FrameworkElement>>();
double minHeightSum = 0;
m_elementList.Add(new List<FrameworkElement>());
int column = 0;
if (WrapChildren.Count > 0)
{
foreach (FrameworkElement child in WrapChildren)
{
double tempMinHeight = 0.0;
if (WrapGridPanel.GetWrapHeight(child).GridUnitType != GridUnitType.Star)
{
tempMinHeight = Math.Max(child.ActualHeight, child.MinHeight) + child.Margin.Top + child.Margin.Bottom;
}
else
{
tempMinHeight = child.MinHeight + child.Margin.Top + child.Margin.Bottom;
}
minHeightSum += tempMinHeight;
if (minHeightSum > ActualHeight)
{
minHeightSum = tempMinHeight;
m_elementList.Add(new List<FrameworkElement>());
column++;
}
m_elementList[column].Add(child);
}
}
if (m_elementList.Count != m_wrapPanel.Children.Count)
{
return true;
}
for (int i = 0; i < m_elementList.Count; i++)
{
List<FrameworkElement> columnList = m_elementList[i];
Grid wrapGrid = m_wrapPanel.Children[i] as Grid;
if (columnList.Count != wrapGrid.Children.Count)
{
return true;
}
}
return false;
}
private void RecalcMatrix()
{
if (ActualHeight == 0 || SetupMatrix() == false)
{
return;
}
Binding heightBinding = new Binding("ActualHeight");
heightBinding.Source = this;
while (m_elementList.Count > m_wrapPanel.Children.Count)
{
Grid wrapGrid = new Grid();
wrapGrid.SetBinding(Grid.HeightProperty, heightBinding);
m_wrapPanel.Children.Add(wrapGrid);
}
while (m_elementList.Count < m_wrapPanel.Children.Count)
{
Grid wrapGrid = m_wrapPanel.Children[m_wrapPanel.Children.Count - 1] as Grid;
wrapGrid.Children.Clear();
m_wrapPanel.Children.Remove(wrapGrid);
}
for (int i = 0; i < m_elementList.Count; i++)
{
List<FrameworkElement> columnList = m_elementList[i];
Grid wrapGrid = m_wrapPanel.Children[i] as Grid;
wrapGrid.RowDefinitions.Clear();
for (int j = 0; j < columnList.Count; j++)
{
FrameworkElement child = columnList[j];
GridLength wrapHeight = WrapGridPanel.GetWrapHeight(child);
Grid.SetRow(child, j);
Grid parentGrid = child.Parent as Grid;
if (parentGrid != wrapGrid)
{
if (parentGrid != null)
{
parentGrid.Children.Remove(child);
}
wrapGrid.Children.Add(child);
}
RowDefinition rowDefinition = new RowDefinition();
rowDefinition.Height = new GridLength(Math.Max(1, child.MinHeight), wrapHeight.GridUnitType);
wrapGrid.RowDefinitions.Add(rowDefinition);
}
}
}
public static readonly DependencyProperty WrapHeightProperty =
DependencyProperty.RegisterAttached("WrapHeight",
typeof(GridLength),
typeof(WrapGridPanel),
new FrameworkPropertyMetadata(new GridLength(1.0, GridUnitType.Auto)));
public static readonly DependencyProperty WrapChildrenProperty =
DependencyProperty.Register("WrapChildren",
typeof(ObservableCollection<FrameworkElement>),
typeof(WrapGridPanel),
new UIPropertyMetadata(null));
}
做什么的图片
答案 1 :(得分:1)
我不认为有一个标准的面板实现,表现得像你想要的那样。所以,你最好的选择可能就是自己动手。
起初听起来可能有些吓人,但并不困难。
您可以在某处挖掘WrapPanel
源代码(单声道?),并根据您的需要进行调整。
您不需要列和行。您所需要的只是一个附加的Size
属性:
<StuffPanel Orientation="Vertical">
<Button StuffPanel.Size="Auto" MinHeight="30">I'm auto-sized.</Button>
<Button StuffPanel.Size="*" MinHeight="90">I'm star-sized.</Button>
<Button StuffPanel.Size="Auto" MinHeight="30">I'm auto-sized.</Button>
<Button StuffPanel.Size="*" MinHeight="90">I'm star-sized, too!</Button>
<Button StuffPanel.Size="Auto" MinHeight="30">I'm auto-sized.</Button>
<Button StuffPanel.Size="Auto" MinHeight="30">I'm auto-sized.</Button>
</StuffPanel>