返回ImageView的例子，当我在GridView的项目点击 [英] Return ImageView instance when i click on the item GridView
问题描述
如何返回ImageView的实例时，我对项目的GridView点击？
How to return ImageView instance when i click on the item GridView?
创建自定义绑定事件项目单击：
public class ItemClickSquareBinding
: MvxBaseAndroidTargetBinding
{
private readonly GridView _gridView;
private IMvxCommand _command;
public ItemClickSquareBinding(GridView gridView)
{
_gridView = gridView;
_gridView.ItemClick += GridView_ItemClick;
}
private void GridView_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
{
//----->Get ImageView
}
public override void SetValue(object value)
{
_command = (IMvxCommand)value;
}
protected override void Dispose(bool isDisposing)
{
if (isDisposing)
{
_gridView.ItemClick -= GridView_ItemClick;
}
base.Dispose(isDisposing);
}
public override Type TargetType
{
get { return typeof(IMvxCommand); }
}
public override MvxBindingMode DefaultMode
{
get { return MvxBindingMode.OneWay; }
}
}
我的GridView的：
<cirrious.mvvmcross.binding.android.views.MvxBindableGridView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="4"
android:gravity="center"
android:listSelector="#00000000"
local:MvxItemTemplate="@layout/itemimage"
local:MvxBind="{'ItemsSource':{'Path':'Squares'}, 'ClickItemSquare':{'Path':'ClickCommand'}}" />
我的ImageView的：
<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res/LeSommet.ZooSnap.UI.Android"
android:layout_width="80dp"
android:layout_height="80dp"
android:padding="5dp"
android:layout_gravity="center"
local:MvxBind="{'ResourcesImagePath':{'Path':'ImagePath'}}"
/>
如何返回ImageView的实例时，我对项目的GridView点击？ （或者我怎么可能会返回点击它我对象的实例）
推荐答案
以下三个答案......我preFER一个标记 3
Three answers below ... I prefer the one marked 3
在一个真正的基本层面，我想你可以只使用内置的此绑定。
At a really basic level, I think you can just use the built-in binding for this.
看着项目单击在<一个href=\"https://github.com/slodge/MvvmCross/blob/vnext/Cirrious/Cirrious.MvvmCross.Binding.Droid/Views/MvxBindableGridView.cs\" rel=\"nofollow\">https://github.com/slodge/MvvmCross/blob/vnext/Cirrious/Cirrious.MvvmCross.Binding.Droid/Views/MvxBindableGridView.cs你应该能够只是做：
Looking at ItemClick in https://github.com/slodge/MvvmCross/blob/vnext/Cirrious/Cirrious.MvvmCross.Binding.Droid/Views/MvxBindableGridView.cs you should be able to just do:
<cirrious.mvvmcross.binding.android.views.MvxBindableGridView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="4"
android:gravity="center"
android:listSelector="#00000000"
local:MvxItemTemplate="@layout/itemimage"
local:MvxBind="{'ItemsSource':{'Path':'Squares'}, 'ItemClick':{'Path':'ClickCommand'}}" />
其中，点击指令是这样的：
public ICommand ClickCommand { get { return new MvxRelayCommand<Square>(square => square.Foo()); } }
如果这不起作用，那么请筹集与测试code <错误/一> - 格被社会各界捐赠给MvvmCross所以它不是我还没用过
If this doesn't work, then please raise a bug with test code - the grid was community donated to MvvmCross so it's not something I've used yet.
如果你想做的自定义绑定。
If you do want to do the custom binding.
使用IntelliSense，它看起来像一个 AdapterView.ItemClickEventArgs 有几个可能有用的属性：
Using Intellisense, it looks like an AdapterView.ItemClickEventArgs has a couple of potentially useful properties:
e.View;
e.Position;
所以，你可以访问查看如果你想 - 然后可以使用的东西像 FindViewById＆LT;＆GT; 找到包含意见。
So you can access the View if you want to - and can then use things like FindViewById<> to find contained views.
或者你也可以访问位置，然后可以：
- 使用适配器方法，如公众覆盖对象的GetItem（INT位置）来获得一个Java包装的对象从原来的数组
- 或者可以使用访问方法直接传入阵列或枚举上
Or you can access the Position and can then:
- use Adapter methods like public override Object GetItem(int position) to get a Java wrapped object from your original array
- or can use accessor method direct on your incoming array or enumerable.
我一般不做这种习俗的结合，当所有我想要做的就是点击一个列表项列表项或一部分。
I generally don't do this sort of custom binding when all I want to do is click on a list item or part of a list item.
相反，我写我的ViewModels，使他们暴露启用行为的集合 - 我尝试present Model对象的激活行为包装而不是模型对象本身
Instead I write my ViewModels so that they expose behaviour-enabled collections - I try to present a behaviour-enabled wrapper of the Model object rather than the Model object itself.
在这种方法中，视图模型暴露了一个列表＆LT;的代替列表＆LT; WrappedSquare＆GT广场＆GT;
In this approach the ViewModel exposes a List<WrappedSquare> instead of a List<Square>
public WrappedSquare
{
Square _saure;
SquareViewModel _square;
public WrappedSquare(Square square, SquareViewModel parent)
{
/* assignment */
}
public ICommand TheCommand { get { return MvxRelayCommand(() -> _parent.DoStuff(_square)); } }
public Square TheSquare { get { return _square; } }
}
列表项中的AXML再有类似的绑定：
The axml within the list item then has bindings like:
<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res/LeSommet.ZooSnap.UI.Android"
android:layout_width="80dp"
android:layout_height="80dp"
android:padding="5dp"
android:layout_gravity="center"
local:MvxBind="{'ResourcesImagePath':{'Path':'TheSquare.ImagePath'},'Click':{'Path':'TheCommand'}}"
/>
和网格的AXML是：
<cirrious.mvvmcross.binding.android.views.MvxBindableGridView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="4"
android:gravity="center"
android:listSelector="#00000000"
local:MvxItemTemplate="@layout/itemimage"
local:MvxBind="{'ItemsSource':{'Path':'WrappedSquares'}}" />
这个例子code从<一个适应href=\"http://stackoverflow.com/questions/12682082/mvvmcross-changing-viewmodel-within-a-mvxbindablelistview\">MVVMCross一个MvxBindableListView 内改变视图模型 - 答案有有关这个问题太
This example code is adapted from MVVMCross changing ViewModel within a MvxBindableListView - the answer there is relevant to this question too.
这种方法的一个实际例子是使用会议样本 WithCommand＆LT; T＆GT; 来实现从名单详细信息视图导航
One real example of this approach is the Conference sample which uses WithCommand<T> to enable navigation from lists to detail views.
不过...有关于这种方法的一个警告 - 请注意，使用 WithCommand＆LT时，T＆GT; ，我们发现在iOS中/ MonoTouch的内存泄漏 - 基本上是垃圾回收拒绝收集嵌入 MvxRelayCommand - 这就是为什么 WithCommand＆LT; T＆GT; 是的IDisposable 为什么 BaseSessionListViewMode 清除列表并配置 WithCommand 元素时，视图分离。
However... there is one warning on this approach - please note that when using WithCommand<T> we discovered a memory leak in iOS/MonoTouch - basically the GarbageCollection refused to collect the embedded MvxRelayCommand - which is why WithCommand<T> is IDisposable and why BaseSessionListViewMode clears the list and disposes the WithCommand elements when views are detached.
这篇关于返回ImageView的例子，当我在GridView的项目点击的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
