XAML如下
<StackPanel>
<RadioButton GroupName="colorgrp">Red</RadioButton>
<RadioButton GroupName="colorgrp">Blue</RadioButton>
<RadioButton GroupName="numgrp">1</RadioButton>
<RadioButton GroupName="numgrp">2</RadioButton>
<RadioButton>4</RadioButton>
<RadioButton>5</RadioButton>
</StackPanel>
在一个Panel下,若没有指定GroupName则为一组,指定了GroupName为另外一组.
逻辑:一组内,选中一个Button取消其他的Button选中状态.
在没有分组状态下
即把Button的父容器找出来,然后反选未指定GroupName的Button
分组概念
要把多个Button存为一组,即多个key,每个key对应一个列表,可以以HashTable为基础.
应该由内部控件来调用,否则可能会引起重复的问题
public class RadioGroup
{
[ThreadStatic]
private static Hashtable _groupNameToElements; public static void Register(string groupName, RadioButton radioButton)
{
if (_groupNameToElements == null)
{
_groupNameToElements = new Hashtable(1);
}
lock (_groupNameToElements)
{
ArrayList elements = (ArrayList)_groupNameToElements[groupName];
if (elements == null)
{
elements = new ArrayList(1);
_groupNameToElements[groupName] = elements;
}
else
{
PurgeDead(elements, null);
}
elements.Add(new WeakReference(radioButton));
}
} public static void Unregister(string groupName, RadioButton radioButton)
{
if (_groupNameToElements != null)
{
lock (_groupNameToElements)
{
ArrayList elements = (ArrayList)_groupNameToElements[groupName];
if (elements != null)
{
PurgeDead(elements, radioButton);
if (elements.Count == 0)
{
_groupNameToElements.Remove(groupName);
}
}
}
}
} private static void PurgeDead(ArrayList elements, object elementToRemove)
{
int index = 0;
while (index < elements.Count)
{
WeakReference reference = (WeakReference)elements[index];
object target = reference.Target;
if ((target == null) || (target == elementToRemove))
{
elements.RemoveAt(index);
}
else
{
index++;
}
}
}
}