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Loxodonframework quick start
2022-07-07 09:25:00 【heater404】
One 、 brief introduction
LoxodonFramework What is it? , What is it for . I won't introduce it here , Direct up link :vovgou/loxodon-framework: An MVVM & Databinding framework that can use C# and Lua to develop games (github.com)
There is a full introduction and tutorial in the link , This article mainly records the experience of learning and understanding the framework .
Two 、 Quick start
I have used it before WPF Of MVVM frame –Prism, So in unity Also want to find a similar framework , that LoxodonFramework Can it also be like Prism So easy to use ? Now we can simply try .
3、 ... and 、 Example
We have created the above project , Want to do such a thing : After entering a value in the input box, the slider will slide to the corresponding value , When the slider slides, the input box will display the corresponding value .
Just imagine , If not applicable MVVM Thought , We can mount a script , These two controls are found in the script properties , Then assign values to each other during operation , This should be a very simple job . But use MVVM How should I do it ?
3.1Model
Because the data model of the example is very simple , Basic data types can be used , So this layer is omitted .
3.2ViewModel
This layer is our interaction logic . Data update and event response logic code are here .
3.3View
Here is UI layer , Only controls are involved , It does not involve data business . Let's talk about the train of thought , Usually in UI Control to mount a script , This script is what we need View layer , Of course, it will inherit UIView class , Then bind in the script . Binding is mainly to UI The properties or events of the control are bound to ViewModel Properties or methods in . therefore ViewModel It's not a script , There is no need to mount on the control .
Then take a look at the specific implementation of the code :
public class SampleViewModel : ViewModelBase
{
private float sliderValue;
public float SliderValue
{
get {
return sliderValue; }
set {
Set<float>(ref sliderValue, value, "SliderValue"); }
}
public void OnSliderValueChanged(float newValue)
{
if (newValue != sliderValue)
{
this.SliderValue = newValue;
Debug.Log($"NewValue:{
newValue}");
}
}
public void OnInputFieldChanged(string str)
{
this.SliderValue = int.Parse(str);
}
}
public class SampleView : UIView
{
public InputField input;
public Slider slider;
protected override void Awake()
{
// Get the application context
ApplicationContext context = Context.GetApplicationContext();
// Start the data binding service
BindingServiceBundle bindingService = new BindingServiceBundle(context.GetContainer());
bindingService.Start();
}
protected override void Start()
{
// Get the data binding context
IBindingContext bindingContext = this.BindingContext();
bindingContext.DataContext = new SampleViewModel {
SliderValue = 98 };
// binding UI Control to view model
BindingSet<SampleView, SampleViewModel> bindingSet;
bindingSet = this.CreateBindingSet<SampleView, SampleViewModel>();
// take VM The value in is bound to UI Controls , Note that here is one-way binding vm=>v
bindingSet.Bind(this.input).For(v => v.text).To(vm => vm.SliderValue).OneWay();
bindingSet.Bind(this.slider).For(v => v.value).To(vm => vm.SliderValue).OneWay();
// Then bind the event of the control to vm The methods of , Be careful To To use generics , The parameters of the method are consistent with those of the event method .
// Of course, it can also be bound to commands ( Later we will introduce )
bindingSet.Bind(this.slider).For(v => v.onValueChanged).To<float>(vm => vm.OnSliderValueChanged);
bindingSet.Bind(this.input).For(v => v.onEndEdit).To<string>(vm=>vm.OnInputFieldChanged);
// This sentence should not be forgotten
bindingSet.Build();
}
}
The idea of binding is similar .
Four 、 About binding
There is such a piece of code in the above example :
// Get the data binding context
IBindingContext bindingContext = this.BindingContext();
bindingContext.DataContext = new SampleViewModel {
SliderValue = 98 };
The above code can also be modified as follows :
this.SetDataContext(new SampleViewModel {
SliderValue = 98 });
Behaviour Class extends SetDataContext Method , Its internal implementation also uses IBindingContext Interface .
Yes WPF Bound students must be familiar , you 're right , There's also DataContext The concept of . About DataContext, The author of the framework has such a description in the document :
Generally speaking, data binding is initialized in the view creation function , adopt BindingSet To configure the binding relationship between the view control and the view model , When calling BindingSet Of Build Function time ,
Binder Will create BindingSet All binding pairs in , The created binding pair will be saved in the current view BindingContext in .BindingContext Automatically create on the first call , Same as
Automatically generates a BindingContextLifecycle Script , Hang on the current view object , It controls BindingContext Life cycle of , When the view is destroyed ,BindingContext Meeting
And then destroy it , Store in BindingContext The binding relationship pairs in will also be destroyed .
therefore , about View Layer of DataContext, We can set it externally , Or later changes , It is not necessarily the same as the example in build Set it up .
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