Override existing style in StyleSelector

[Aurélien]

Hi,

My question : I would like get access to "test" style in my GridCellRedEvo class !

Ex :

<Style x:Key="test" TargetType="grid:GridCell">

<Setter Property="Background" Value="PowderBlue" />

<Setter Property="FontWeight" Value="SemiBold" />

</Style>

<grid:GridNumericColumn HeaderText="CA" MappingName="EvolCaDif" TextAlignment="Right" FormatString="##0.0 %" Width="100" CellStyle="{StaticResource test}" CellStyleSelector="{StaticResource GridCellRedEvo}" >

public class GridCellRedEvo : StyleSelector

{

protected override Style SelectStyleCore(object item, DependencyObject container)

{

}

}

[Jai Ganesh S]

Hi Aurélien, 

 

You can achieve your requirement to access the style in CellStyleSelector class like below, 

 

public class SelectorClass : StyleSelector 

    { 

        protected override Style SelectStyleCore(object item, DependencyObject container) 

        { 

 

            var data = item as BusinessObjects; 

            if (data != null) 

            { 

                if(data.EmployeeAge<45) 

                    return App.Current.Resources["test"] as Style; 

            } 

 

            return base.SelectStyleCore(item, container); 

        } 

    } 

 

 

Sample: http://www.syncfusion.com/downloads/support/directtrac/general/ze/SfGridCellStyleDemo190797802.zip 

 

Kb Link: 

https://www.syncfusion.com/kb/2601/how-to-set-background-color-for-cells-in-a-column-based-on-the-cell-content 

 

https://www.syncfusion.com/kb/3176/how-to-improve-performance-when-using-formatting-and-styling-for-the-cells-based-on-data 

 

Regards, 

Jai Ganesh S 

[Aurélien]

I'll try this.

Thank you.

[Jai Ganesh S]

Hi Aurélien,  

 

Thank you for the update. 

 

Please let us know if you need further assistance on this. 

 

Regards, 

Jai Ganesh S 

[Aurélien]

Hi,

An other question !

How to know if test style is applied or not on the current cell ?

[Jai Ganesh S]

 

Hi Aurélien,   

 

We have analyzed your query. In the last provided sample, we have applied the cell style using CellStyleSelector based on certain condition. So the test style will be applied in GridCell based on the condition. You can find if the currentcell contains the style or not by using the CurrentCellActivated event like below,   

 

this.datagrid.CurrentCellActivated += datagrid_CurrentCellActivated; 

 

void datagrid_CurrentCellActivated(object sender, CurrentCellActivatedEventArgs args) 

{ 

    GridCell cell; 

    Style cellStyle; 

    if (datagrid.SelectionController.CurrentCellManager.CurrentCell != null) 

    { 

        cell = (this.datagrid.SelectionController.CurrentCellManager.CurrentCell.ColumnElement as GridCell); 

        cellStyle = cell.Style; 

        if(cellStyle!=null) 

        { 

           //Write your code  

        } 

    } 

} 

 

Sample: http://www.syncfusion.com/downloads/support/directtrac/general/ze/SfGridCellStyleDemo762186241.zip 

 

Regards, 

Jai Ganesh S 

 

[Aurélien]

Thank you.

I'll test that.

Aurélien

[Jayaleshwari N]

Hi Aurélien, 

 

Thanks for the update.  

we will wait to hear from you 

 

Regards., 

 

Jayaleshwari N. 

[Aurélien]

Hi,

Is there an other solution to test if the "test" style is applied on my current cell in my StyleSelector ?

I can't found a solution to access to the current cell in this !

My first need is to return a different style if the "test" style was applied or not, more a value test !

Thanks in advance.

Aurélien

[Jayaleshwari N]

Hi Aurélien, 

 

We have checked your query “Access the current cell and test the test style applied or not”. You can get the GridCell using Container from StyleSelector. 

 

You can check the GridCell is CurrentCell or not by using DataColumnBase.IsCurrentCell property, like in below code. 

 

C# code: Return test style if the current cell doesn’t have style or the style is not a “test” style 

 

public class SelectorClass : StyleSelector 

{ 

    public override Style SelectStyle(object item, DependencyObject container) 

    { 

        var gridCell = container as GridCell; 

        if (gridCell == null) 

            return base.SelectStyle(item, container); 

 

        var dataColumnBase = gridCell.ColumnBase; 

        if(dataColumnBase.IsCurrentCell) 

        { 

            if (gridCell.Style == null) 

                return App.Current.Resources["test"] as Style; 

 

 

            if(gridCell.Style != null) 

            { 

                var setter = (gridCell.Style.Setters.FirstOrDefault(o => (o as Setter).Value.Equals("test")) as Setter); 

                var styleName = setter != null ? setter.Value : string.Empty; 

 

                if(string.IsNullOrEmpty(styleName.ToString())) 

                    return App.Current.Resources["test"] as Style; 

            } 

 

        } 

    } 

} 

You can get the name of the style by using Name property of GridCell, like in below code. 

XAML code: Define a style with Name in setter of style. 

 

<Application.Resources> 

    <ResourceDictionary> 

        <Style x:Key="test" TargetType="Grid:GridCell"> 

            <Setter Property="Name" Value="test"/> 

            <Setter Property="Background" Value="PowderBlue" /> 

            <Setter Property="FontWeight" Value="SemiBold" /> 

        </Style> 

    </ResourceDictionary> 

</Application.Resources> 

 

Above code return the test style to the CurrentCell, where the GridCell does not have style and if the applied style is not a “test” style. 

Regards, 

Jayaleshwari N. 

 

[Aurélien]

Hello,

Good solution but i have a problem.

if (dataColumnBase.IsCurrentCell) is always false !

Please see my test project in attachment.

Regards,

Aurélien

Attachment: App3_646aaeda.zip

[Jai Ganesh S]

Hi Aurélien, 

 

The dataColumnBase.IsCurrentCell will be true only the currentcell was selected otherwise it is in false. Now we have modified your sample to apply the style in StyleSelector based on the cell style applied in cell. 

  

public class GridCellRedEvo : StyleSelector 

    { 

        protected override Style SelectStyleCore(object item, DependencyObject container) 

        { 

            var gridCell = container as GridCell; 

            if (gridCell == null) 

                return base.SelectStyle(item, container); 

 

            var dataColumnBase = gridCell.ColumnBase; 

           // if (dataColumnBase.IsCurrentCell) 

            {                 

                if (gridCell.Style == null) 

                    return App.Current.Resources["Redtest"] as Style; 

 

                if (gridCell.Style != null) 

                { 

                    var setter = (gridCell.Style.Setters.FirstOrDefault(o => (o as Setter).Value.Equals("testName")) as Setter); 

                    var styleName = setter != null ? setter.Value : string.Empty; 

 

                     

 

                    if (string.IsNullOrEmpty(styleName.ToString())) 

                        return App.Current.Resources["Redtest"] as Style; 

                } 

 

            } 

 

            return base.SelectStyleCore(item, container); 

        } 

    } 

 

Sample: http://www.syncfusion.com/downloads/support/directtrac/general/ze/App3_646aaeda1403603907.zip 

 

Regards, 

Jai Ganesh S 

[Aurélien]

Hello,

Thanks for your answer.

I have an other little problem with your example.

 (gridCell.Style != null)  is already null.

Regards,

Aurélien

[Aurélien]

*answer=reply

[Jai Ganesh S]

Hi Aurélien, 

 

In our last updated sample, we have applied the cell style (Redtest) while the gridCell.Style == null. Otherwise if the cell already has style then we have checked the style name whether is match with the already applied cell’s style name). If the style name equals with the already applied cell’s style, then we have applied the Redtest style. Could you please check the sample and let us know whether your requirement has been achieved otherwise please share the exact details for your requirement.  This would be more helpful for us to analyze further. 

 

Regards, 

Jai Ganesh S 

[Aurélien]

Hello,

I need to know if test (CellStyle="{StaticResource test}") style is currently applied or not on the cell.

Your solution with name property in test style is a good solution but in the styleSelector gridCell.Style is always null.

Please see my test project in attachment.

Regards,

Aurélien

Attachment: App3_c516fb12.zip

[Jai Ganesh S]

Hi Aurélien,  

It is not possible to find if the style is applied or not, for the current cell  in StyleSelector.  Because the cell style will be set based on the CellStyleSelector when you applied both CellStyle and CellStyleSelector in a column. Hence the gridcell.CellStyle always null in a StyleSelector. But the gridcell.Stlye  will be set only after you refreshing (Sorting, Filteing etc..) the columns. 

Regards, 

Jai Ganesh S 

[Aurélien]

Hi,

Thanks for your reply.

I have found a other solution to resolve my problem.

Regards,

Aurelien

[Sowndaiyan Paulpandi]

Hi Aurélien

Thanks for the update.

Please let us know if you need further assistance.

Regards, 

Sowndaiyan