Scrollbar And DragDelta

[sarita54]

Hi ,
I don t find how to change the drag delta of my scroll bar that I have customize , the scrollbar define like that :

        <Style x:Key="ScrollThumbs" TargetType="{x:Type Thumb}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Thumb}">
                        <Grid x:Name="Grid" >
                            <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Fill="Transparent" />
                            <Border x:Name="Rectangle1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Background="{TemplateBinding Background}" />
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="Tag" Value="Horizontal">
                                <Setter TargetName="Rectangle1" Property="Width" Value="Auto" />
                                <Setter TargetName="Rectangle1" Property="Height" Value="Auto" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <!--ScrollBars-->
        <Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}">
            <Setter Property="Stylus.IsFlicksEnabled" Value="false" />
            <Setter Property="Foreground" Value="#8C8C8C" />
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="Width" Value="8" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ScrollBar}">
                        <Grid x:Name="GridRoot" Width="8" Background="{TemplateBinding Background}">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="0.00001*" />
                            </Grid.RowDefinitions>
                            <Track x:Name="PART_Track" Grid.Row="0" IsDirectionReversed="true" Focusable="false">
                                <Track.Thumb>
                                    <Thumb x:Name="Thumb" Background="{TemplateBinding Foreground}" Style="{DynamicResource ScrollThumbs}" />
                                </Track.Thumb>
                                <Track.IncreaseRepeatButton>
                                    <RepeatButton x:Name="PageUp" Command="ScrollBar.PageDownCommand" Opacity="0" Focusable="false" />
                                </Track.IncreaseRepeatButton>
                                <Track.DecreaseRepeatButton>
                                    <RepeatButton x:Name="PageDown" Command="ScrollBar.PageUpCommand" Opacity="0" Focusable="false" />
                                </Track.DecreaseRepeatButton>
                            </Track>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger SourceName="Thumb" Property="IsMouseOver" Value="true">
                                <Setter Value="{DynamicResource ButtonSelectBrush}" TargetName="Thumb" Property="Background" />
                            </Trigger>
                            <Trigger SourceName="Thumb" Property="IsDragging" Value="true">
                                <Setter Value="{DynamicResource DarkBrush}" TargetName="Thumb" Property="Background" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter TargetName="Thumb" Property="Visibility" Value="Collapsed" />
                            </Trigger>
                            <Trigger Property="Orientation" Value="Horizontal">
                                <Setter TargetName="GridRoot" Property="LayoutTransform">
                                    <Setter.Value>
                                        <RotateTransform Angle="10" />
                                    </Setter.Value>
                                </Setter>
                                <Setter TargetName="PART_Track" Property="LayoutTransform">
                                    <Setter.Value>
                                        <RotateTransform Angle="10" />
                                    </Setter.Value>
                                </Setter>
                                <Setter Property="Width" Value="Auto" />
                                <Setter Property="Height" Value="8" />
                                <Setter TargetName="Thumb" Property="Tag" Value="Horizontal" />
                                <Setter TargetName="PageDown" Property="Command" Value="ScrollBar.PageLeftCommand" />
                                <Setter TargetName="PageUp" Property="Command" Value="ScrollBar.PageRightCommand" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

Could you help me please?
Thanks

 

[Skydiver]

To find the delta, isn't it just a matter of comparing the previous value of the scrollbar with the current value?

I think you need to explain what you are trying to do in more detail, as well as, what you have already tried to solve your problem.

 

[sarita54]

I want to change the delta drag not to find the value
thanks for the help

 

[Skydiver]

Like for something like "small change" and "big change" for the WPF scroll bars.