Gridsplitter的问题

neilyoung 2012-04-25 11:23:43

silverlight版本无问题，wpf版本出现非法操作异常--无法设置对象“System.Windows.Media.TransformGroup”上的属性，因为它处于只读状态。

抛出异常的代码部分在



protected virtual void OnCollapseModeChanged(GridSplitterCollapseMode collapseMode)

{

...

 if (collapseMode == GridSplitterCollapseMode.Previous)

                {

                    if (_elementHorizontalGridSplitterButton != null)

                    {

                        _elementHorizontalGridSplitterButton.RenderTransform.SetValue(ScaleTransform.ScaleYProperty, -1.0);

                    }

                    if (_elementVerticalGridSplitterButton != null)

                    {

                        _elementVerticalGridSplitterButton.RenderTransform.SetValue(ScaleTransform.ScaleXProperty, -1.0);

                    }

                }

                else if (collapseMode == GridSplitterCollapseMode.Next)

                {

                    if (_elementHorizontalGridSplitterButton != null)

                    {

                        _elementHorizontalGridSplitterButton.RenderTransform.SetValue(ScaleTransform.ScaleYProperty, 1.0);

                    }

                    if (_elementVerticalGridSplitterButton != null)

                    {

                        _elementVerticalGridSplitterButton.RenderTransform.SetValue(ScaleTransform.ScaleXProperty, 1.0);

                    }

                }

}

mainwindow.XAML 部分代码：



<controls:ExtendedGridSplitter Grid.Column="1"

                                           VerticalAlignment="Stretch"

                                           HorizontalAlignment="Center"

                                           Width="10"

                                           CollapseMode="Previous"

                                           Background="LightBlue" />

控件模板xaml



<!-- Horizontal Template -->

                        <Grid x:Name="HorizontalTemplate"

                              Visibility="Collapsed">

                            <Grid.ColumnDefinitions>

                                <ColumnDefinition Width="*" />

                                <ColumnDefinition Width="50" />

                                <ColumnDefinition Width="*" />

                            </Grid.ColumnDefinitions>

                            <!-- Horizontal GridSplitter Handle -->

                            <ToggleButton x:Name="HorizontalGridSplitterHandle"

                                          Grid.Column="1"

                                          IsHitTestVisible="True"

                                          Style="{TemplateBinding HorizontalHandleStyle}"

                                          RenderTransformOrigin="0.5,0.5">

                                <ToggleButton.RenderTransform>

                                    <TransformGroup>

                                        <ScaleTransform ScaleY="1" />

                                    </TransformGroup>   

                                </ToggleButton.RenderTransform>

                            </ToggleButton>

                        </Grid>