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CPF 入門教程 - 數據綁定和命令綁定(二)ide
數據綁定和Wpf相似,支持雙向綁定。數據綁定和命令綁定是UI和業務邏輯分離的基礎。函數
首先,你須要定義個MainModel,爲了能夠有屬性通知,這個類能夠繼承CpfObject或者本身實現INotifyPropertyChanged測試
1 public class MainModel : CpfObject 2 { 3 [PropertyMetadata("默認值")] 4 public string Test 5 { 6 get { return (string)GetValue(); } 7 set { SetValue(value); } 8 } 9 }
這裏定義了一個Test屬性,而且設置默認值爲「默認值」this
設計個測試界面,加個TextBlock和Button,同時TextBlock設置綁定,綁定定義在Bindings屬性, {nameof(TextBlock.Text),nameof(MainModel.Test) } 表示TextBlock的Text綁定到DataContext的Test屬性spa
public class Window4 : Window { protected override void InitializeComponent() { Title = "標題"; Width = 344.8f; Height = 126.4f; Background = null; Children.Add(new WindowFrame(this, new Panel { Width = "100%", Height = "100%", Children = { //內容元素放這裏 new Button { MarginLeft = 223.8f, MarginTop = 25.7f, Height = 28f, Width = 67.4f, Content = "Button", }, new TextBlock { MarginLeft = 36.7f, MarginTop = 31.6f, Text = "TextBlock", Bindings = { {nameof(TextBlock.Text),nameof(MainModel.Test) } } }, } })); LoadStyleFile("res://ConsoleApp1.Stylesheet1.css"); //加載樣式文件,文件須要設置爲內嵌資源 } }
修改program,設置Window的DataContext和CommandContext設計
var model = new MainModel(); Application.Run(new Window4 { DataContext = model, CommandContext = model });
寫好以後,運行看看效果。TextBlock那邊顯示MainModel那邊定義的默認值雙向綁定
接下來定義命令,經過按鈕點擊修改Test值,同時自動更新到TextBlock
MainModel裏增長個Click方法
class MainModel : CpfObject { [PropertyMetadata("默認值")] public string Test { get { return (string)GetValue(); } set { SetValue(value); } } public void Click() { Test += "test"; } }
Button那邊增長命令綁定,Commands裏添加, {nameof(Button.Click),nameof(MainModel.Click) } 表示Button的Click事件綁定到CommandContext的Click方法
new Button { MarginLeft = 223.8f, MarginTop = 25.7f, Height = 28f, Width = 67.4f, Content = "Button", Commands = { {nameof(Button.Click),nameof(MainModel.Click) } } },
運行效果,點擊一次增長一次test。這就是最簡單的模型視圖分離的數據綁定
接下來綁定集合
設計界面,添加Button和ListBox
往MainModel里加上Items集合屬性,構造函數裏初始化集合,用 Collection 是爲了有集合變化通知,也能夠使用 ObservableCollection。 (string, string) 就是元組裏簡化的結構體類型定義,是一種偷懶簡化數據定義的方式,不過這種方式的話,改item就不能更新到UI了,須要能夠更新到UI的就須要自定義類型,繼承CpfObject或者繼承INotifyPropertyChanged的類型做爲Item
public MainModel() { Items = new Collection<(string, string)>(); } public Collection<(string,string)> Items { get { return (Collection<(string, string)>)GetValue(); } set { SetValue(value); } }
MainModel里加個AddItem方法
public void AddItem() { Items.Add(("test" + Items.Count, Items.Count.ToString())); }
最終代碼
using CPF; using System; using System.Collections.Generic; using System.Text; namespace ConsoleApp1 { class MainModel : CpfObject { [PropertyMetadata("默認值")] public string Test { get { return (string)GetValue(); } set { SetValue(value); } } public void Click() { Test += "test"; } public MainModel() { Items = new Collection<(string, string)>(); } public Collection<(string, string)> Items { get { return (Collection<(string, string)>)GetValue(); } set { SetValue(value); } } public void AddItem() { Items.Add(("test" + Items.Count, Items.Count.ToString())); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; using CPF; using CPF.Drawing; using CPF.Controls; using CPF.Shapes; using CPF.Styling; using CPF.Animation; namespace ConsoleApp1 { public class Window4 : Window { protected override void InitializeComponent() { Title = "標題"; Width = 338.4f; Height = 205.6f; Background = null; Children.Add(new WindowFrame(this, new Panel { Width = "100%", Height = "100%", Children = { //內容元素放這裏 new Button { MarginLeft = 223.8f, MarginTop = 25.7f, Height = 28f, Width = 67.4f, Content = "Button", Commands = { { nameof(Button.Click), nameof(MainModel.Click) } } }, new TextBlock { MarginLeft = 36.7f, MarginTop = 31.6f, Text = "TextBlock", Bindings = { { nameof(TextBlock.Text), nameof(MainModel.Test) } } }, new Button { MarginLeft = 223.8f, MarginTop = 91.6f, Height = 28f, Width = 67.4f, Content = "添加Item", Commands = { {nameof(Button.Click),nameof(MainModel.AddItem) } } }, new ListBox { SelectedValuePath = "Item2",//綁定Item裏的Item1屬性 DisplayMemberPath = "Item1",//綁定Item裏的Item2屬性 BorderStroke = "1,Solid", BorderFill = "#DEDEDE", MarginLeft = 36.7f, MarginTop = 60.8f, Height = 76.5f, Width = 123.2f, Bindings = { {nameof(ListBox.Items),nameof(MainModel.Items) } } }, } })); LoadStyleFile("res://ConsoleApp1.Stylesheet1.css"); //加載樣式文件,文件須要設置爲內嵌資源 } } }
最終運行效果,點擊添加Item的按鈕,ListBox裏會增長Item
數據類型轉換,Test屬性值後面加1。 數據轉換器用方法或者Lambda就行。
{ nameof(TextBlock.Text), nameof(MainModel.Test), null, BindingMode.OneWay, (string a)=>a+"1" }
UI元素之間綁定,TextBox的Text綁定到Button的Content,其中TextBox設置PresenterFor=this,是爲了標記TextBox的做用域在當前類,由於Name是能夠重複的,元素嵌套若是有相同Name會沒法判斷元素是在哪裏的,因此用PresenterFor加標記判斷,並且這樣能夠經過FindPresenterByName方法來獲取當前類裏的標記元素來綁定
protected override void InitializeComponent() { Title = "標題"; Width = 338.4f; Height = 205.6f; Background = null; Children.Add(new WindowFrame(this, new Panel { Width = "100%", Height = "100%", Children = { //內容元素放這裏 new Button { MarginLeft = 223.8f, MarginTop = 25.7f, Height = 28f, Width = 67.4f, Content = "Button", Commands = { { nameof(Button.Click), nameof(MainModel.Click) } }, Bindings = { { nameof(Button.Content), nameof(TextBox.Text), FindPresenterByName("textBox") } } }, new TextBlock { MarginLeft = 36.7f, MarginTop = 31.6f, Text = "TextBlock", Bindings = { { nameof(TextBlock.Text), nameof(MainModel.Test), null, BindingMode.OneWay, (string a)=>a+"1" } } }, new Button { MarginLeft = 223.8f, MarginTop = 91.6f, Height = 28f, Width = 67.4f, Content = "添加Item", Commands = { { nameof(Button.Click), nameof(MainModel.AddItem) } } }, new ListBox { SelectedValuePath = "Item2", //綁定Item裏的Item1屬性 DisplayMemberPath = "Item1", //綁定Item裏的Item2屬性 BorderStroke = "1,Solid", BorderFill = "#DEDEDE", MarginLeft = 36.7f, MarginTop = 60.8f, Height = 76.5f, Width = 123.2f, Bindings = { { nameof(ListBox.Items), nameof(MainModel.Items) } } }, new TextBox { Name="textBox", PresenterFor=this, AcceptsReturn= false, HScrollBarVisibility= ScrollBarVisibility.Hidden, VScrollBarVisibility= ScrollBarVisibility.Hidden, MarginLeft = 144.8f, MarginTop = 28.1f, Width = 74.5f }, } })); LoadStyleFile("res://ConsoleApp1.Stylesheet1.css"); //加載樣式文件,文件須要設置爲內嵌資源 }
TextBox輸入,會自動更新Button的文字
命令綁定除了事件以外,屬性變化也能夠綁定爲命令,好比,鼠標移入和移出就調用
Commands =
{
{
nameof(Button.IsMouseOver),
nameof(MainModel.Click)
}
}
主要綁定就這些,若是要雙向綁定,命令參數等等,看VS那邊的智能提示