1. 程式人生 > >win10 uwp 按下等待按鈕

win10 uwp 按下等待按鈕

我們經常需要一個按鈕,在按下時,後臺執行Task,這時不能再次按下按鈕。

我們使用自定義控制元件,首先新建一個類,我把它命名是ProgressButton

一個進度條按鈕,也就是我們按下時發生進度條,完成時他又是按鈕。

我們需要一個值讓我們知道是不是已經完成了後臺,按鈕可以按下,在按下時,自動讓按鈕IsEnable為false。

我們需要模板有TextBlock,顯示文字,ProgressRing顯示進度條。

於是我們使用TemplatePart

    [TemplatePart(Name = "TextBlock", Type = typeof(TextBlock))]
    [TemplatePart(Name = "Progress"
, Type = typeof(Windows.UI.Xaml.Controls.ProgressRing))] public class ProgressButton : Windows.UI.Xaml.Controls.Button

依賴屬性其實很簡單,我們需要在VS上大propdp 按Tab 就可以看到vs幫我們寫的依賴屬性。

我們需要修改屬性名稱,屬性型別,預設值。

我這裡的Text ,需要他修改時使用函式,這個叫CallBack。

依賴函式使用DependencyProperty.Register

他引數: name 是 屬性名, propertyType 是屬性型別, ownerType 是屬於的類的型別, typeMetadata 是預設值和修改時使用函式

我們來說下 typeMetadata

typeMetadata 可以傳入一個預設值,這個值就是我們不在依賴屬性賦值,就給他一個預設的值。然後我們還可以給他一個在屬性修改時使用的函式。

注意我們給他的函式不是必需,一般都不需要。

如果需要給他一個函式,這個函式需要有引數DependencyObject sender, DependencyPropertyChangedEventArgs e

其中 sender 是傳送的例項,我們知道屬性屬於哪個類,我在這裡,是屬於ProgressButton ,我就可以使用 ProgressButton button = sender as ProgressButton;

得到類,注意我們寫的函式是靜態的,所以sender才有用,我們可以使用sender獲得類的屬性

e 是有 NewValue 和 OldValue , NewValue 是我們要修改的值, OldValue 是原來的值。

大概需要的依賴屬性在我們這個控制元件有 Text Complete 就沒了。

Text是我們按鈕的文字,Complete 是我們的後臺是不是在執行,如果是的話,按鈕就無法點選,顯示進度條。

程式碼:

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace lindexi.uwp.control.Button.Control
{
    [TemplatePart(Name = "TextBlock", Type = typeof(TextBlock))]
    [TemplatePart(Name = "Progress", Type = typeof(Windows.UI.Xaml.Controls.ProgressRing))]
    public class ProgressButton : Windows.UI.Xaml.Controls.Button
    {
        public ProgressButton()
        {
            DefaultStyleKey = typeof(ProgressButton);
            Click += ProgressButton_Click;
        }

        private void ProgressButton_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
        {
            Complete = false;
        }

        private Windows.UI.Xaml.Controls.TextBlock _textBlock;

        private Windows.UI.Xaml.Controls.ProgressRing _proress;

        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(ProgressButton), new PropertyMetadata("",
                (d, e) =>
                {
                    ProgressButton temp = d as ProgressButton;
                    if (temp == null)
                    {
                        return;
                    }
                    if(temp._textBlock!=null)
                    {
                        temp._textBlock.Text = (string) e.NewValue;
                    }
                }));



        public bool Complete
        {
            get { return (bool)GetValue(CompleteProperty); }
            set { SetValue(CompleteProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Complete.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty CompleteProperty =
            DependencyProperty.Register("Complete", typeof(bool), typeof(ProgressButton), new PropertyMetadata(true,
                OnComplete));

        private static void OnComplete(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ProgressButton button = d as ProgressButton;
            if (button == null)
            {
                return;
            }

            bool temp = (bool)e.NewValue;


            //button._textBlock.Visibility = temp ? Visibility.Visible : Visibility.Collapsed;
            button._proress.Visibility = temp ? Visibility.Collapsed : Visibility.Visible;
            button.IsEnabled = temp;
        }



        protected override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            _textBlock = GetTemplateChild("TextBlock") as Windows.UI.Xaml.Controls.TextBlock;
            _proress = GetTemplateChild("Progress") as Windows.UI.Xaml.Controls.ProgressRing;

            if (_textBlock != null)
            {
                _textBlock.Visibility = Visibility.Visible;
                _textBlock.Text = Text;
            }

            if (_proress != null)
            {
                _proress.Visibility=Visibility.Collapsed;
            }
        }
    }
}

我們在控制元件 OnApplyTemplate 拿到 _textBlock _proress 我們需要寫一個Style

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:control="using:lindexi.uwp.control.Button.Control">
    <Style TargetType="control:ProgressButton">
        <Setter Property="Background" Value="{ThemeResource ButtonBackground}"/>
        <Setter Property="Foreground" Value="{ThemeResource ButtonForeground}"/>
        <Setter Property="BorderBrush" Value="{ThemeResource ButtonBorderBrush}"/>
        <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}"/>
        <Setter Property="Padding" Value="8,4,8,4"/>
        <Setter Property="HorizontalAlignment" Value="Left"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
        <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
        <Setter Property="FontWeight" Value="Normal"/>
        <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
        <Setter Property="UseSystemFocusVisuals" Value="True"/>
        <Setter Property="FocusVisualMargin" Value="-3"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="control:ProgressButton">
                    <Grid x:Name="RootGrid" Background="{TemplateBinding Background}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal">
                                    <Storyboard>
                                        <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="PointerOver">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBackgroundPointerOver}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBorderBrushPointerOver}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonForegroundPointerOver}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="TextBlock" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonForegroundPointerOver}"></DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBackgroundPressed}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBorderBrushPressed}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonForegroundPressed}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <PointerDownThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBackgroundDisabled}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonBorderBrushDisabled}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonForegroundDisabled}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="TextBlock" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonForegroundDisabled}"></DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <ContentPresenter x:Name="ContentPresenter" 
                                          AutomationProperties.AccessibilityView="Raw" 
                                          BorderBrush="{TemplateBinding BorderBrush}" 
                                          BorderThickness="{TemplateBinding BorderThickness}"
                                          ContentTemplate="{TemplateBinding ContentTemplate}" 
                                          ContentTransitions="{TemplateBinding ContentTransitions}"
                                          Content="{TemplateBinding Content}" 
                                          HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                          Padding="{TemplateBinding Padding}" 
                                          VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        <TextBlock x:Name="TextBlock" Margin="10,10,10,10"
                                   HorizontalAlignment="Center"
                                   VerticalAlignment="Center"></TextBlock>
                        <ProgressRing x:Name="Progress" IsActive="True"></ProgressRing>

                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

這個是從Button複製,就改了Button為 control:ProgressButton

我們要使用按鈕,需要在資源寫

    <Page.Resources>
        <ResourceDictionary Source="Control/ProgressButton.xaml"></ResourceDictionary>
    </Page.Resources>

然後就可以使用 ProgressButton ,我寫ProgressButton在control資料夾,我需要在名稱空間xmlns:control="using:lindexi.uwp.control.Button.Control"

 <control:ProgressButton Text="確定"
                                 Complete="{x:Bind View.Complete,Mode=TwoWay}"
                                 Click="ButtonBase_OnClick"></control:ProgressButton>

那麼如果我們有好多個頁面都用到 ProgressButton ,我們需要在所有頁面都寫 ResourceDictionary 這樣不好,我們有一個簡單方法,讓頁面不用寫這個。

在解決方案新建一個資料夾Themes,注意命名一定是Themes,注意有個名稱後面有個s,我就在這坑好多天了。

然後新建資源字典 Generic.xaml ,注意名稱也是不能自己修改。

在 Generic.xaml 合併字典

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="ms-appx:///Control/ProgressButton.xaml"></ResourceDictionary>
    </ResourceDictionary.MergedDictionaries>

這樣我們就可以在頁面直接用。

如果使用遇到問題,歡迎討論。