Programming with .NET - General

Re: Changing a button's style in runtime ?

Hergerger — Tue, 17 Nov 2009 15:23:51 GMT

@salonVB Hi salonVB. I had the same id as you, but the button will not change its appearence. Is there anything else to do (e.g. invalidate, update layout, etc.) or should it be enough? Thankx in advance Hergerger

Re: Changing a button's style in runtime ?

salonVB — Mon, 14 Sep 2009 06:35:54 GMT

Don't make things too complicated.

Do one thing, when u apply first time write this:

bt.Style = (Style)this.Resources["activated"];

And when u want to reapply the style, u can search for the key in Resources and if exists then remove the key and readd the new style. Like following :

if (this.Resources.Contains("activated")) this.Resources.Remove("activated");

this.Resources.Add("activated", (XamlReader.Load("ActivatedStyleString")));

where "ActivatedStyleString" is the new style tag string.

This is Silverlight's feature, that u can't apply style twice to a control, u need to remove the style key and reapply the style.

Re: Changing a button's style in runtime ?

HarjinderSingh9988 — Mon, 17 Aug 2009 07:45:26 GMT

Hi Sladapter,

I tried as u said that picking up style from external xml file. i created a file consisting of style that I assign to a button at runtime which is already having a style defined in xaml. my styl file is as follows . I am getting error when I use gradient color or storyboard Present in Mouse over, pressed etc,i am also unable to chnge the content If the content is already assigned in the xaml file. i am using web service to read my style file.

.

<Style xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

x:Key="stylebtnallclick" TargetType="Button">

<Setter.Value>

</LinearGradientBrush>

</Setter.Value>

</Setter>

<Setter.Value>

<Grid>

<VisualStateManager.VisualStateGroups>

</DoubleAnimationUsingKeyFrames>

</ColorAnimationUsingKeyFrames>

</Storyboard>-->

</VisualState>

</DoubleAnimationUsingKeyFrames>

</ColorAnimationUsingKeyFrames>

</ColorAnimationUsingKeyFrames>

</Storyboard>-->

</VisualState>

</DoubleAnimationUsingKeyFrames>

</Storyboard>-->

</VisualState>

</VisualStateGroup>

</DoubleAnimationUsingKeyFrames>

</Storyboard>-->

</VisualState>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

</Rectangle>

</Grid>

</Border>

</Grid>

</ControlTemplate>

</Setter.Value></Setter>

</Style>

My Web service code is as follows.....

public XmlDocument GetStyle(String Filename)
        {
            String st = Server.MapPath("Styles/" + Filename + ".xml");
             if (File.Exists(Server.MapPath("Styles/" + Filename + ".xml")))

                       {
                            XmlDocument xmlDoc = new XmlDocument();

                            xmlDoc.Load(Server.MapPath("Styles/" + Filename + ".xml"));

    

                            return xmlDoc;
 
                       }

                           else

                          return null;
        }

and I called this method in my silverlight application as......

 void btnShowAllConvos_Click(object sender, RoutedEventArgs e)
        {
            Button btnRef = null;
            try
            {
                btnRef = e.OriginalSource as Button;
                if (btnRef != null)
                {
                    // btnRef.Background = new SolidColorBrush(Colors.Blue);
                  //  objJakayaServices.GetStyleDocumentAsync("MyStyles.xml");
                    objstyle.GetStyleAsync("MyStyles");
                    objstyle.GetStyleCompleted += new EventHandler(objstyle_GetStyleCompleted);


                }
                CurrentConvoType = ConvoType.All;
                objJakayaServices.GetLoggedUsersConvoListAsync(this.UserName, CurrentConvoStatus, CurrentConvoType, this.CurrentTimeSpan);
            }
            catch (Exception ex) { }
            finally
            {
                btnRef = null;
            }
        }


        void objstyle_GetStyleCompleted(object sender, JakayaConvo.MyTestStyleService.GetStyleCompletedEventArgs e)
        {
            try
            {
                if (e.Error == null && e.Result != null)
                {
                    Style dynamicstyle = System.Windows.Markup.XamlReader.Load((e.Result as System.Xml.Linq.XElement).ToString()) as Style;

                    if (dynamicstyle != null)
                    {
                         foreach (UIElement objUielement in this.maingrid.Children.Where(u => u.GetType().ToString() == "JakayaConvo.barcontrol"))
                        {
                            barcontrol objBarControl = null;
                            try
                            {
                                objBarControl = objUielement as barcontrol;
                               objBarControl.btnall.Style = dynamicstyle;
                            }
                            catch (Exception)
                            { }
                            finally
                            {
                                objBarControl = null;
                            }
                        }
                        

                    }
                }
            }
            catch (Exception ex) { }

            finally
            {
                
            }
        }

So tell me where I am wrong And how to do this. Plzzzzzzzzz Its really urgent
"1.0" encoding="utf-8" ?>-->
"http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Key="stylebtnallclick" TargetType="Button"> "FontSize" Value="10"/> "Background" Value="#FF1F3B53"/>--> "Foreground" Value="Red"/> "Padding" Value="3"/> "Content" Value="Hello"/> "ContentTemplate" Value="Hello"/> "BorderThickness" Value="1"/> "BorderBrush"> "0.5,1" StartPoint="0.5,0"> "#FFA3AEB9" Offset="0"/> "#FF8399A9" Offset="0.375"/> "#FF718597" Offset="0.375"/> "#FF617584" Offset="1"/> "Template"> "Button"> "CommonStates"> "Normal"/> "MouseOver"> "BackgroundAnimation" Storyboard.TargetProperty="Opacity"> "0" Value="1"/> "BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)"> "0" Value="#7FFFFFFF"/> --> "Pressed"> "BackgroundAnimation" Storyboard.TargetProperty="Opacity"> "0" Value="1"/> "BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)"> "0" Value="#D8FFFFFF"/> "BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)"> "0" Value="#3FFFFFFF"/> "Disabled"> "DisabledVisualElement" Storyboard.TargetProperty="Opacity"> "0" Value=".55"/> --> "FocusStates"> "Focused"> "FocusVisualElement" Storyboard.TargetProperty="Opacity"> "0" Value="1"/> --> "Unfocused"/> "Background" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> "1" Background="{TemplateBinding Background}" Opacity="0.25"> "BackgroundAnimation" Background="#FF62E4FF"/> "BackgroundGradient" Fill="#FF62E4FF"> "contentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" Margin="0,0,0,1"/> "DisabledVisualElement" Fill="#FFFFFFFF" RadiusX="0" RadiusY="0" IsHitTestVisible="false" Opacity="0"/> "FocusVisualElement" Stroke="#FF6DBDD1" StrokeThickness="0" RadiusX="0" RadiusY="0" Margin="1" IsHitTestVisible="false" Opacity="0"/>

Re: Changing a button's style in runtime ?

davjanks — Mon, 06 Jul 2009 06:44:32 GMT

Thanks sladapter

Worked like a charm.

Re: Changing a button's style in runtime ?

egoZd — Sun, 05 Jul 2009 05:30:52 GMT

Please view this post to find out how to dymatic set up style for button

http://www.slblogger.cn/p60.htm

Re: Changing a button's style in runtime ?

sladapter — Sat, 04 Jul 2009 15:42:04 GMT

If the style is defined in App.xmal, use

Style = Application.Current.Resources["redButton"] as Style;

Re: Changing a button's style in runtime ?

davjanks — Sat, 04 Jul 2009 05:43:14 GMT

Hi I know this is quite a while later but...

I have tried the code sample above and it does not set my style at runtime. Here is my code

Button newButton = new Button()

{

Content = itemDescription,

HorizontalAlignment = HorizontalAlignment.Left,Style = (Style)Resources["redButton"]

};

One difference is that my style is in the app.xaml not local resource. Any ideas?

Re: Changing a button's style in runtime ?

microsoft_kc — Tue, 09 Sep 2008 04:11:48 GMT

Use the following:

bt.Style = (Style)this.Resources["activated"];

Re: Changing a button's style in runtime ?

codism — Mon, 08 Sep 2008 15:27:03 GMT

I just want to throw an idea here: if a control's style cannot be assigned twice, there may be a work around: just take the old control out and create a new control and add it to the parent control. Putting the new control in the old control's place may be a little tricky but should be doable.

Re: Changing a button's style in runtime ?

nosuic — Mon, 08 Sep 2008 15:03:46 GMT

that's correct.. it's a big deal to follow the best way and use the right controls from the begining of a project...

Re: Changing a button's style in runtime ?

sladapter — Mon, 08 Sep 2008 14:09:25 GMT

Actually, for your purpose, using ToggleButton and define Checked state might be a simpler approach than define 2 styles for Button.

See this thread:

http://silverlight.net/forums/t/24461.aspx

Re: Changing a button's style in runtime ?

nosuic — Sun, 07 Sep 2008 14:58:35 GMT

Actually, changing the style itself was my first idea, but I found it too complicated. The fact that the trick with 2 styles isn't working leaves no choice which way to follow.

Thanks very much for the links, i never thought that somebody would like to change a style on runtime until I checked those links ;-P

Thanks again! :)

Re: Changing a button's style in runtime ?

sladapter — Sun, 07 Sep 2008 14:22:03 GMT

That might be the case.

Another way to dynamically change a style is to change the Style definition itself. You can dynamically import the style xaml and set the this.Resources["buttonStyle"] = XamlReader.Load(newStyleXamlString) as Style. This way you do not reset control's style, but control will take the new style because you changed style definition.

see this blog:

http://leeontech.wordpress.com/2008/07/21/dynamic-styles/

and this thread:

http://silverlight.net/forums/p/21371/74796.aspx#74796

Re: Changing a button's style in runtime ?

nosuic — Sun, 07 Sep 2008 09:36:40 GMT

I get again the same error "Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))"

sladapter:
But you can only do this (apply style to a control) once in code.

Trying to change a button's style on runtime, when this button has already a style, might be the second time the code is trying to apply a style to it.

So it's not possible actually..

Thanks for helping :)

Re: Changing a button's style in runtime ?

sladapter — Sun, 07 Sep 2008 02:54:18 GMT

If you want to set the style defined in the UserControl.Resources you do this:

 bt.Style = (Style)this.Resources["activated"];

But you can only do this (apply style to a control) once in code.