もっと！WPF勉強会 第2回 Behavior/WPFStudyMore2

もっと！WPF勉強会 第2回 Behavior　（WPF勉強会の通算第7回）

説明後に実演するライブコーディングのコードはこちら。
https://github.com/hachiilcane/WpfStudy

Transcript

1. ΋ͬͱʂWPFษڧձ ୈ2ճ Behavior
2. ࠓ೔֮͑ͯ΄͍͜͠ͱ Behavior͸ɺViewଆͰ΍΍ෳࡶͳϓϨ θϯςʔγϣϯϩδοΫΛهड़͢Δํ ๏ BehaviorͱTrigger&TriggerAction͸਌ੰ ࠷ॳ͔Β༻ҙ͞Ε͍ͯΔBehavior΋͋Δ
3. ͜Ε·Ͱͷ෮श ViewModelΫϥε σʔλ ViewΫϥε(XAML) σʔλ Πϕϯτ σʔλόΠϯσΟϯά ίϚϯυ ॲཧ
4. ͜Ε·Ͱͷ෮श ViewModelΫϥε σʔλ ViewΫϥε(XAML) σʔλ Πϕϯτ σʔλόΠϯσΟϯά ίϚϯυ ॲཧ ͔͠͠ɺ଍Γͳ͍ϐʔε͕͋Δ
5. ͜Μͳͱ͖͸Ͳ͏͠Α͏ ʮListBoxʹόΠϯυ͞Ε͍ͯΔίϨΫ γϣϯ͕૿͑ͨΒɺListBoxͷεΫϩʔ ϧΛҰ൪ԼʹҠಈ͍ͤͨ͞ʯ
6. ؆୯ͦ͏Ͱ೉͍͠ ListBoxʹ͸ɺΞΠςϜ͕૿͑ͨͱ͍͏Π ϕϯτ͸ͳ͍ ίϨΫγϣϯΛ؅ཧ͍ͯ͠Δͷ͸ ViewModel Ͱ΋಺༰తʹॲཧ͸View͚ͩʹॻ͖ͨ ͍ΑͶ
7. ΍Γ͍ͨ͜ͱΛ੔ཧ͢Δ ͱ ʢόΠϯσΟϯάιʔεͷ৘ใΛར༻͠ ͭͭʣViewͰ΍΍ෳࡶͳॲཧΛ͍ͨ͠
8. ΍Γ͍ͨ͜ͱΛ੔ཧ͢Δ ͱ ʢόΠϯσΟϯάιʔεͷ৘ใΛར༻͠ ͭͭʣViewͰ΍΍ෳࡶͳॲཧΛ͍ͨ͠ Behavior
9. Ґஔ͚ͮ ViewModelΫϥε σʔλ ViewΫϥε(XAML) σʔλ Πϕϯτ σʔλόΠϯσΟϯά ίϚϯυ ॲཧ ϓϨθϯςʔ γϣϯϩδοΫ Behavior
10. BehaviorΫϥεͷ࡞Γํ Behavior<T>Λܧঝ͢Δ NuGetͰMicrosoft.Xaml.Behaviors.WpfΛΠϯε τʔϧ͍ͯͩ͘͠͞ɻ OnAttached(), OnDetaching()Λoverrideͯ͠ɺTͷΠϕ ϯτʹొ࿥ this.AssociatedObjectͰTͷΠϯελϯεΛऔಘͰ ͖Δ
11. ඞཁͳϥΠϒϥϦʹ͍ͭ ͯิ଍ Ҏલ͸Behavior΍TriggerAction΍ಛघͳΠϕϯτॲཧ͸ Blend SDKʹؚ·Ε͍ͯͨSystem.Windows.Interactivity.dll ͱ͍͏ϥΠϒϥϦ͕த৺Ͱͨ͠ɻ ͔͜͠͠ͷϥΠϒϥϦͷத਎͸OSSʹͳΓ·ͨ͠ɻ NuGetͰΠϯετʔϧͰ͖Δ Microsoft.Xaml.Behaviors.Wpf͕ͦΕͰ͢ɻࠓޙ͸ͦͪΒ Λ࢖͍ͬͯͩ͘͞ɻಛʹVisual Studio 2019͔Β͸ System.Windows.Interactivity.dll͕࢖͑ͳ͘ͳ͍ͬͯ· ͢ɻ
12. BehaviorΫϥεͷงғؾ Microsoft.Xaml.Behaviors.Wpfඞཁ public class BeepBehavior : Behavior<Button> { protected override void OnAttached() { base.OnAttached(); this.AssociatedObject.Click += Button_Click; } protected override void OnDetaching() { this.AssociatedObject.Click -= Button_Click; base.OnDetaching(); } private void Button_Click(object sender, System.Windows.RoutedEventArgs e) { // Կ͔ViewଆͷॲཧɻϘλϯԡͨ͠ΒԻ͕໐Δͱ͔ } }
13. XAMLଆͰίϯτϩʔϧ ʹBehaviorΛ௥Ճ͢Δ <Button> <Behaviors:Interaction.Behaviors> <view:BeepBehavior /> </Behaviors:Interaction.Behaviors> </Button> <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:view="clr-namespace:WpfStudy.View" xmlns:Behaviors=“http://schemas.microsoft.com/xaml/behaviors” ʙҎԼུ
14. BehaviorΛ௥Ճ͢Δͱ͸ Ͳ͏͍͏͜ͱ͔ ͋Δίϯτϩʔϧʹ֎͔ΒৼΔ෣͍Λ௥Ճ͢ Δ ͦͷৼΔ෣͍ΛBehaviorΫϥεͱͯ͠࡞Δ ίϯτϩʔϧΛܧঝͨ͠ΫϥεΛ࡞Δඞཁ ͕ͳ͍ StrategyύλʔϯΈ͍ͨͳΠϝʔδʁ
15. BehaviorͷϝϦοτ ࠶ར༻Մೳ ෼཭ίʔυʹॻ͔ͳͯ͘ࡁΉ ViewModelʹແཧ໼ཧϓϨθϯςʔγϣϯϩδο ΫΛॻ͔ͳͯ͘ࡁΉ ૄ݁߹͸อͨΕΔ ҙ֎ͱखܰ
16. Behaviorͷߏ଄ΛΑ͘ݟ Δͱ public class SomethingBehavior : Behavior<Button> { protected override void OnAttached() { base.OnAttached(); this.AssociatedObject.Click += Button_Click; } protected override void OnDetaching() { this.AssociatedObject.Click -= Button_Click; base.OnDetaching(); } private void Button_Click(object sender, System.Windows.RoutedEventArgs e) { // Կ͔ViewଆͷॲཧɻϘλϯԡͨ͠ΒԻ͕໐Δͱ͔ } } ࣮ߦ͢Δ͖͔͚ͬ BehaviorͰ࣮ߦ͢Δॲཧ
17. Trigger ͱ TriggerAction BehaviorΛɺ͖͔͚ͬͷ෦෼ͱॲཧ෦෼ ʹ෼͚ͨͷ͕Trigger ͱ TriggerAction
18. Trigger & TriggerAction public class ButtonClickTrigger : TriggerBase<Button> { protected override void OnAttached() { base.OnAttached(); this.AssociatedObject.Click += Button_Click; } protected override void OnDetaching() { this.AssociatedObject.Click -= Button_Click; base.OnDetaching(); } private void Button_Click(object sender, System.Windows.RoutedEventArgs e) { // ࢠཁૉͷΞΫγϣϯΛ࣮ߦ this.InvokeActions(e); } } public class BeepAction : TriggerAction<DependencyObject> { protected override void Invoke(object parameter) { // ԻΛ໐Β͢ॲཧ } }
19. XAMLʹTrigger & TriggerActionΛೖΕΔ xmlns͸Behaviorͱಉ͡ײ͡ <Button> <Behaviors:Interaction.Triggers> <view:ButtonClickTrigger> <view:BeepAction/> </view:ButtonClickTrigger> </Behaviors:Interaction.Triggers> </Button>
20. BehaviorͱTrigger&TriggerAction ͷ࢖͍෼͚ ͖͔͚ͬͱActionͷؔ܎ੑ͕ඇৗʹߴ͍ͷͰ͋Ε͹ Behavior Microsoft.Xaml.Behaviors.Wpfʹ EventTrigger ͱ͍͏ඇৗʹ ൚༻తͳτϦΨʔΫϥε͕༻ҙ͞Ε͍ͯΔͷͰɺTrigger͸ ࡞ΒͣʹTriggerAction͚ͩ࡞Δͷ΋͋Γ खܰʹෳࡶͳViewͷॲཧΛ௥ՃͰ͖Δ ࣮ͨͩࡍʹ࢖͍ͬͯΔͱBehavior͚ͩͰे෼ͩͳʔͱ͍͏ ײ͕͍ͯ͡͠Δ
21. ࠷ॳ͔Β༻ҙ͞Ε͍ͯΔ Behavior FluidMoveBehavior ίϨΫγϣϯͷ௥Ճ΍Ҡಈ͕׈Β͔ ʹͳΔʢ͏ʹΐΜɺͯײ͡ʣ ΄͔ʹ΋͍Ζ͍Ζ
22. ࠷ॳ͔Β༻ҙ͞Ε͍ͯΔ TriggerAction InvokeCommandAction ͋Εɺ͜Ε࢖͑͹ͲΜͳ͖͔͚͔ͬΒͰ΋Command࢖ ͑Δʁ CallMethodAction ͋Εɺ͑ͬʁͰ΋͜Ε࢖͏ͷ͸ઈର΍Ίͨ΄͏͕͍ ͍ɻCommandΛ࢖͍·͠ΐ͏ɻ ……΄͔ʹ͍Ζ͍Ζ͋Δ͕ະ֬ೝɻͦΜͳʹ࢖͏͜ͱ͸ͳ ͍ɻ
23. ߹͍ݴ༿͸ Behaviorɺ࢖͑ΔʂɹConverterɺ࢖͑ Δʂ
24. Ͱ͸ͬͦ͘͜͞ΕΛ࣮૷ ͯ͠ΈΑ͏ʂ ʮListBoxʹόΠϯυ͞Ε͍ͯΔίϨΫ γϣϯ͕૿͑ͨΒɺListBoxͷεΫϩʔ ϧΛҰ൪ԼʹҠಈ͍ͤͨ͞ʯ