Xamarin 在点击时扩展ListView单元格的大小
我正在尝试实现一个解决方案,当使用Xamarin 在点击时扩展ListView单元格的大小,xamarin,xamarin.forms,Xamarin,Xamarin.forms,我正在尝试实现一个解决方案,当使用Xamarin表单点击时,增加列表视图单元格的大小(以及自定义渲染器,如果需要) 我对C#还是相当陌生,数据绑定的概念对我来说还是有点不清楚,但是,似乎这就是解决这个问题的方法(可能是绑定单元格的高度/高度请求属性?) 到目前为止,我的尝试没有成功 如果有人能把我推向正确的方向,我将不胜感激 谢谢大家! ViewCell在Xamarin.Forms 1.4.2x 但是,如果您在模型中创建自己的BindableProperty,您仍然可以实现如下所示的高度更改:-
Xamarin表单
点击时,增加列表视图
单元格
的大小(以及自定义渲染器,如果需要)
我对C#还是相当陌生,数据绑定的概念对我来说还是有点不清楚,但是,似乎这就是解决这个问题的方法(可能是绑定单元格的高度
/高度请求
属性?)
到目前为止,我的尝试没有成功
如果有人能把我推向正确的方向,我将不胜感激
谢谢大家!
ViewCell
在Xamarin.Forms 1.4.2x
但是,如果您在模型中创建自己的BindableProperty
,您仍然可以实现如下所示的高度更改:-
型号:-
public class MenuItem2 : BindableObject
{
public static readonly BindableProperty TextProperty = BindableProperty.Create<MenuItem2, string>(p => p.Text, default(string));
public static readonly BindableProperty CellHeightProperty = BindableProperty.Create<MenuItem2, int>(p => p.CellHeight, default(int));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public int CellHeight
{
get { return (int)GetValue(CellHeightProperty); }
set { SetValue(CellHeightProperty, value); }
}
}
<StackLayout>
<Button x:Name="cmdButton1" Text="Change Cell Heights" Clicked="cmdButton1_Clicked"/>
<ListView x:Name="lstItems" />
</StackLayout>
lstItems.HasUnevenRows = true;
lstItems.ItemTemplate = new DataTemplate(typeof(Classes.MenuCell2));
//
lstItems.ItemsSource = new List<MenuItem2>
{
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
};
public class MenuCell2 : ViewCell
{
public MenuCell2()
{
Label objLabel = new Label
{
YAlign = TextAlignment.Center,
TextColor = Color.Yellow,
};
objLabel.SetBinding(Label.TextProperty, new Binding("Text"));
StackLayout objLayout = new StackLayout
{
Padding = new Thickness(20, 0, 0, 0),
Orientation = StackOrientation.Horizontal,
HorizontalOptions = LayoutOptions.StartAndExpand,
Children = { objLabel }
};
Frame objFrame_Inner = new Frame
{
Padding = new Thickness(15, 15, 15, 15),
HeightRequest = 36,
OutlineColor = Color.Accent,
BackgroundColor = Color.Blue,
Content = objLayout,
};
Frame objFrame_Outer = new Frame
{
Padding = new Thickness(0, 0, 0, 10),
Content = objFrame_Inner
};
View = objFrame_Outer;
this.BindingContextChanged += MenuCell2_BindingContextChanged;
}
void MenuCell2_BindingContextChanged(object sender, EventArgs e)
{
MenuItem2 objMenuItem = (MenuItem2)this.BindingContext;
objMenuItem.PropertyChanged += objMenuItem_PropertyChanged;
}
void objMenuItem_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case "CellHeight":
this.Height = (this.BindingContext as MenuItem2).CellHeight;
(this.View as Frame).ForceLayout();
break;
}
}
自定义视图单元格:-
public class MenuItem2 : BindableObject
{
public static readonly BindableProperty TextProperty = BindableProperty.Create<MenuItem2, string>(p => p.Text, default(string));
public static readonly BindableProperty CellHeightProperty = BindableProperty.Create<MenuItem2, int>(p => p.CellHeight, default(int));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public int CellHeight
{
get { return (int)GetValue(CellHeightProperty); }
set { SetValue(CellHeightProperty, value); }
}
}
<StackLayout>
<Button x:Name="cmdButton1" Text="Change Cell Heights" Clicked="cmdButton1_Clicked"/>
<ListView x:Name="lstItems" />
</StackLayout>
lstItems.HasUnevenRows = true;
lstItems.ItemTemplate = new DataTemplate(typeof(Classes.MenuCell2));
//
lstItems.ItemsSource = new List<MenuItem2>
{
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
};
public class MenuCell2 : ViewCell
{
public MenuCell2()
{
Label objLabel = new Label
{
YAlign = TextAlignment.Center,
TextColor = Color.Yellow,
};
objLabel.SetBinding(Label.TextProperty, new Binding("Text"));
StackLayout objLayout = new StackLayout
{
Padding = new Thickness(20, 0, 0, 0),
Orientation = StackOrientation.Horizontal,
HorizontalOptions = LayoutOptions.StartAndExpand,
Children = { objLabel }
};
Frame objFrame_Inner = new Frame
{
Padding = new Thickness(15, 15, 15, 15),
HeightRequest = 36,
OutlineColor = Color.Accent,
BackgroundColor = Color.Blue,
Content = objLayout,
};
Frame objFrame_Outer = new Frame
{
Padding = new Thickness(0, 0, 0, 10),
Content = objFrame_Inner
};
View = objFrame_Outer;
this.BindingContextChanged += MenuCell2_BindingContextChanged;
}
void MenuCell2_BindingContextChanged(object sender, EventArgs e)
{
MenuItem2 objMenuItem = (MenuItem2)this.BindingContext;
objMenuItem.PropertyChanged += objMenuItem_PropertyChanged;
}
void objMenuItem_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case "CellHeight":
this.Height = (this.BindingContext as MenuItem2).CellHeight;
(this.View as Frame).ForceLayout();
break;
}
}
记住在ViewCell
的View
属性的根元素上调用ForceLayout
,以便它可以正确地重新绘制
这将为您提供与以下类似的结果(目前仅在WindowsPhone上测试):-
要在点击的ViewCell
上执行此操作,请在XAML页面上添加:-
lstItems.ItemTapped += lstItems_ItemTapped;
然后将该项目的模型更改为如下内容:-
void lstItems_ItemTapped(object sender, ItemTappedEventArgs e)
{
(e.Item as MenuItem2).CellHeight = 200;
}
ViewCell
在Xamarin.Forms 1.4.2x
但是,如果您在模型中创建自己的BindableProperty
,您仍然可以实现如下所示的高度更改:-
型号:-
public class MenuItem2 : BindableObject
{
public static readonly BindableProperty TextProperty = BindableProperty.Create<MenuItem2, string>(p => p.Text, default(string));
public static readonly BindableProperty CellHeightProperty = BindableProperty.Create<MenuItem2, int>(p => p.CellHeight, default(int));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public int CellHeight
{
get { return (int)GetValue(CellHeightProperty); }
set { SetValue(CellHeightProperty, value); }
}
}
<StackLayout>
<Button x:Name="cmdButton1" Text="Change Cell Heights" Clicked="cmdButton1_Clicked"/>
<ListView x:Name="lstItems" />
</StackLayout>
lstItems.HasUnevenRows = true;
lstItems.ItemTemplate = new DataTemplate(typeof(Classes.MenuCell2));
//
lstItems.ItemsSource = new List<MenuItem2>
{
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
};
public class MenuCell2 : ViewCell
{
public MenuCell2()
{
Label objLabel = new Label
{
YAlign = TextAlignment.Center,
TextColor = Color.Yellow,
};
objLabel.SetBinding(Label.TextProperty, new Binding("Text"));
StackLayout objLayout = new StackLayout
{
Padding = new Thickness(20, 0, 0, 0),
Orientation = StackOrientation.Horizontal,
HorizontalOptions = LayoutOptions.StartAndExpand,
Children = { objLabel }
};
Frame objFrame_Inner = new Frame
{
Padding = new Thickness(15, 15, 15, 15),
HeightRequest = 36,
OutlineColor = Color.Accent,
BackgroundColor = Color.Blue,
Content = objLayout,
};
Frame objFrame_Outer = new Frame
{
Padding = new Thickness(0, 0, 0, 10),
Content = objFrame_Inner
};
View = objFrame_Outer;
this.BindingContextChanged += MenuCell2_BindingContextChanged;
}
void MenuCell2_BindingContextChanged(object sender, EventArgs e)
{
MenuItem2 objMenuItem = (MenuItem2)this.BindingContext;
objMenuItem.PropertyChanged += objMenuItem_PropertyChanged;
}
void objMenuItem_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case "CellHeight":
this.Height = (this.BindingContext as MenuItem2).CellHeight;
(this.View as Frame).ForceLayout();
break;
}
}
自定义视图单元格:-
public class MenuItem2 : BindableObject
{
public static readonly BindableProperty TextProperty = BindableProperty.Create<MenuItem2, string>(p => p.Text, default(string));
public static readonly BindableProperty CellHeightProperty = BindableProperty.Create<MenuItem2, int>(p => p.CellHeight, default(int));
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
public int CellHeight
{
get { return (int)GetValue(CellHeightProperty); }
set { SetValue(CellHeightProperty, value); }
}
}
<StackLayout>
<Button x:Name="cmdButton1" Text="Change Cell Heights" Clicked="cmdButton1_Clicked"/>
<ListView x:Name="lstItems" />
</StackLayout>
lstItems.HasUnevenRows = true;
lstItems.ItemTemplate = new DataTemplate(typeof(Classes.MenuCell2));
//
lstItems.ItemsSource = new List<MenuItem2>
{
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
new MenuItem2(),
};
public class MenuCell2 : ViewCell
{
public MenuCell2()
{
Label objLabel = new Label
{
YAlign = TextAlignment.Center,
TextColor = Color.Yellow,
};
objLabel.SetBinding(Label.TextProperty, new Binding("Text"));
StackLayout objLayout = new StackLayout
{
Padding = new Thickness(20, 0, 0, 0),
Orientation = StackOrientation.Horizontal,
HorizontalOptions = LayoutOptions.StartAndExpand,
Children = { objLabel }
};
Frame objFrame_Inner = new Frame
{
Padding = new Thickness(15, 15, 15, 15),
HeightRequest = 36,
OutlineColor = Color.Accent,
BackgroundColor = Color.Blue,
Content = objLayout,
};
Frame objFrame_Outer = new Frame
{
Padding = new Thickness(0, 0, 0, 10),
Content = objFrame_Inner
};
View = objFrame_Outer;
this.BindingContextChanged += MenuCell2_BindingContextChanged;
}
void MenuCell2_BindingContextChanged(object sender, EventArgs e)
{
MenuItem2 objMenuItem = (MenuItem2)this.BindingContext;
objMenuItem.PropertyChanged += objMenuItem_PropertyChanged;
}
void objMenuItem_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case "CellHeight":
this.Height = (this.BindingContext as MenuItem2).CellHeight;
(this.View as Frame).ForceLayout();
break;
}
}
记住在ViewCell
的View
属性的根元素上调用ForceLayout
,以便它可以正确地重新绘制
这将为您提供与以下类似的结果(目前仅在WindowsPhone上测试):-
要在点击的ViewCell
上执行此操作,请在XAML页面上添加:-
lstItems.ItemTapped += lstItems_ItemTapped;
然后将该项目的模型更改为如下内容:-
void lstItems_ItemTapped(object sender, ItemTappedEventArgs e)
{
(e.Item as MenuItem2).CellHeight = 200;
}
Xamarin现在有一个在xaml和xaml代码隐藏中正确执行此操作的官方示例:
概述:
代码:
Xamarin现在有一个官方示例,可以在xaml和xaml代码隐藏中正确执行此操作:
概述:
代码:
谢谢,你的回答真的很有帮助谢谢,你的回答真的很有帮助