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Friday, 18 May 2012

Custom button image of AppBar in a Windows 8 Metro application

Posted on 12:16 by Unknown
Intr-o aplicatie Metro pentru Windows 8, in partea de jos avem un app bar in care putem sa punem diferite comenzi. Este extrem de asemanator cu app bar-ul de pe pe Windows Phone 7. By default, framework-ul contine o lista de icoane pe care le putem folosi pentru aceste comenzi.
Pe langa aceste imagini, sunt cazuri cand dorim sa avem iconite custom, pe care noi le-am definit. Aceste imagini trebuie adaugate sub forma unor resurse png. (48px pe 48px). In general avem cel putin doua resurse, una cand butonul este selectat, iar cealalta pentru starea normala.
Urmatorul pas este sa ne definim un stil pentru a avea un efect pe buton cand acesta este apasat. Acesta se poate face ca in felul urmator:
   <Style x:Key="CustomMyCommandAppBarButtonStyle" TargetType="Button" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<StackPanel Height="70" Orientation="Vertical" Margin="{TemplateBinding Margin}">
<Image Source="/Assets/normalStateButton.png" x:Name="nonpressedImage"/>
<Image Source="/Assets/pressedStateButton.png"
Visibility="Collapsed" x:Name="pressedImage"/>
<TextBlock Text="{TemplateBinding AutomationProperties.Name}"
HorizontalAlignment="Center"
Margin="0,0,2,0"
FontSize="12"
TextAlignment="Center"
Width="88"
MaxHeight="32"
TextTrimming="WordEllipsis"
Style="{StaticResource BasicTextStyle}"/>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver" />
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="pressedImage" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" >
<DiscreteObjectKeyFrame.Value>Visible</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="nonpressedImage" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" >
<DiscreteObjectKeyFrame.Value>Collapsed</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Totul pare destul de simplu, dar va atrag atentia la un lucru, daca nu setati si visual state-ul pentru actiune de mouse over, chiar daca nu definim nici o actiune pentru acesta, dupa ce se apasa butonul, imaginea care o sa ramana afisata o sa fie tot cea care se afiseaza cand butonul este apasat.
<VisualState x:Name="MouseOver" />
Pentru acesta problema este nevoie sa adaugam si visual state-ul pentru mouse over. Lasandul fara nici o actiune custom, o sa fie folosita cea default. Prin acest mod, ii putem spune la buton sa revina la normal dupa ce se face click pe el.
Din cauza ca nu sunt un expert in XAML, mi-a trebuit ceva vreme pana sa imi dau seama care era problema. Sper sa nu patit si voi la fel.
Era sa uit, dupa ce va definiti acest style, tot ce mai este nevoie sa il aplicati stilul pe butonul vostru din AppBar.
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