在codeproject.com上有一篇UniformWrapPanel文章,我對其進行了修改,以確保包裝面板中的項目具有統一的寬度並適合窗口的寬度。您應該可以輕鬆地修改此代碼以獲得最大數量的列。嘗試更改附近的代碼
var itemsPerRow = (int) (totalWidth/ItemWidth);
爲了指定最大列數。
下面的代碼:
public enum ItemSize
{
None,
Uniform,
UniformStretchToFit
}
public class UniformWrapPanel : WrapPanel
{
public static readonly DependencyProperty ItemSizeProperty =
DependencyProperty.Register(
"ItemSize",
typeof (ItemSize),
typeof (UniformWrapPanel),
new FrameworkPropertyMetadata(
default(ItemSize),
FrameworkPropertyMetadataOptions.AffectsMeasure,
ItemSizeChanged));
private static void ItemSizeChanged(
DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
var uniformWrapPanel = sender as UniformWrapPanel;
if (uniformWrapPanel != null)
{
if (uniformWrapPanel.Orientation == Orientation.Horizontal)
{
uniformWrapPanel.ItemWidth = double.NaN;
}
else
{
uniformWrapPanel.ItemHeight = double.NaN;
}
}
}
public ItemSize ItemSize
{
get { return (ItemSize) GetValue(ItemSizeProperty); }
set { SetValue(ItemSizeProperty, value); }
}
protected override Size MeasureOverride(Size availableSize)
{
var mode = ItemSize;
if (Children.Count > 0 && mode != ItemSize.None)
{
bool stretchToFit = mode == ItemSize.UniformStretchToFit;
if (Orientation == Orientation.Horizontal)
{
double totalWidth = availableSize.Width;
ItemWidth = 0.0;
foreach (UIElement el in Children)
{
el.Measure(availableSize);
Size next = el.DesiredSize;
if (!(Double.IsInfinity(next.Width) || Double.IsNaN(next.Width)))
{
ItemWidth = Math.Max(next.Width, ItemWidth);
}
}
if (stretchToFit)
{
if (!double.IsNaN(ItemWidth) && !double.IsInfinity(ItemWidth) && ItemWidth > 0)
{
var itemsPerRow = (int) (totalWidth/ItemWidth);
if (itemsPerRow > 0)
{
ItemWidth = totalWidth/itemsPerRow;
}
}
}
}
else
{
double totalHeight = availableSize.Height;
ItemHeight = 0.0;
foreach (UIElement el in Children)
{
el.Measure(availableSize);
Size next = el.DesiredSize;
if (!(Double.IsInfinity(next.Height) || Double.IsNaN(next.Height)))
{
ItemHeight = Math.Max(next.Height, ItemHeight);
}
}
if (stretchToFit)
{
if (!double.IsNaN(ItemHeight) && !double.IsInfinity(ItemHeight) && ItemHeight > 0)
{
var itemsPerColumn = (int) (totalHeight/ItemHeight);
if (itemsPerColumn > 0)
{
ItemHeight = totalHeight/itemsPerColumn;
}
}
}
}
}
return base.MeasureOverride(availableSize);
}
}
我認爲這是一個'WrapPanel'應該如何工作...繪製每個項目,直到下一個項目不適合,然後換到一個新行。你應該使用'ItemWidth'和'WrapPanel.Width'(或'MaxWidth')來告訴'WrapPanel'何時換行。 – Rachel 2012-03-19 12:51:16