将 XAML 中的本地控件转换为 C#
本文关键字:控件 转换 XAML | 更新日期: 2023-09-27 18:33:20
我正在做一个在透视中显示图像的 WPF 应用程序,并添加了一个小控件,以在屏幕底部以小图标显示所有图像, 当我用一些简单的图像测试它时,它都可以工作,一旦我添加了读取服务器的代码,并处理控件不起作用的文件, 因为一旦我动态添加透视项,就不再调用它。
XAML 代码:
<local:PivoteLocationView="{Binding ElementName=pivot}"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Margin="0,0,0,10"/>
<controls:Pivot Margin="0,-30,0,40"
x:Name="pivot">
<controls:PivotItem>
...
</controls:PivotItem>
</controls:Pivot>
将添加透视项的 C# 代码
pivot.Items.Clear();
for (i = 0; i < total; i++)
{
var rect = new Rectangle();
var btxt = new TextBlock();
var stackend = new StackPanel();
var PIend = new PivotItem();
... code that assigns values
stacktend.Children.Add(rect);
stacktend.Children.Add(btxt);
PIend.Content = stacktend;
pivot.Items.Add(pantodo);
}
该控件:
public class PivotLocationViewModel
{
private Pivot _pivot;
public PivotLocationViewModel()
{
}
public PivotLocationViewModel(Pivot pivot)
{
PivotItems = new PivotItemViewModelCollection();
SetPivot(pivot);
}
public PivotItemViewModelCollection PivotItems { get; set; }
private void SetPivot(Pivot pivot)
{
_pivot = pivot;
// handle selection changed
pivot.SelectionChanged += Pivot_SelectionChanged;
// create a view model for each pivot item.
for(int i=0;i<pivot.Items.Count;i++)
{
PivotItems.Add(new PivotItemViewModel());
}
PivotItems[_pivot.SelectedIndex].IsSelected = true;
}
private void Pivot_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var selectedModel = PivotItems.SingleOrDefault(p => p.IsSelected);
if (selectedModel != null)
selectedModel.IsSelected = false;
PivotItems[_pivot.SelectedIndex].IsSelected = true;
}
}
public class PivotItemViewModelCollection : List<PivotItemViewModel>
{
}
public class PivotItemViewModel : INotifyPropertyChanged
{
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
#endregion
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
if (_isSelected == value)
return;
_isSelected = value;
OnPropertyChanged("IsSelected");
Color = IsSelected ? Colors.Black : Colors.White;
}
}
private Color _color = Colors.White;
public Color Color
{
get { return _color; }
set
{
_color = value;
OnPropertyChanged("Color");
}
}
}
作为一个解决方案,我正在考虑动态添加此代码,而不是在 xaml 文件中使用它,但不知道如何,任何帮助将不胜感激。
<local:PivotLocationView Source="{Binding ElementName=pivot}"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Margin="0,0,0,10"/>
我相信您需要将pivot
变量设置为视图模型中的属性,然后在该属性中调用OnPropertyChanged
。 像这样:
XAML 代码:(请注意它绑定到公共属性透视而不是变量透视)
<local:PivoteLocationView="{Binding ElementName=Pivot}"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Margin="0,0,0,10"/>
将添加透视项的 C# 代码(请注意末尾的透视 = 透视)
pivot.Items.Clear();
for (i = 0; i < total; i++)
{
//....nothing really changes here
}
Pivot = pivot;
添加到控件:
public Pivot Pivot
{
get
{
return pivot;
}
set
{
pivot = value;
OnPropertyChanged("Pivot");
}
}