I have a window that expands to left and to the right.
Simplified example:
<Window x:Class="Application1.Windows.Test"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="MainWindow"
SizeToContent="Width" Height="250">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" /> <!--Expander LEFT-->
<ColumnDefinition Width="25"/>
<ColumnDefinition Width="175" /> <!--Red Content -->
<ColumnDefinition Width="25"/>
<ColumnDefinition Width="Auto"/> <!--Expander RIGHT-->
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="25"/>
<RowDefinition Height="*"/>
<RowDefinition Height="25"/>
</Grid.RowDefinitions>
<Expander Grid.Column="0"
Grid.Row="0"
Grid.RowSpan="3"
Margin="5"
ExpandDirection="Left">
<Grid Width="200">
</Grid>
</Expander>
<Grid Grid.Column="2"
Grid.RowSpan="3"
Background="Red"/>
<Expander Grid.Column="4"
Grid.Row="0"
Grid.RowSpan="3"
Margin="5"
ExpandDirection="Right">
<Grid Width="200">
</Grid>
</Expander>
</Grid>
Here you can see what the problem is:
I've already had a look on WPF - Expand Window to the Left.
The solution kind of works but that is only solving half of the problem.
How to do that for Left AND Right ?
UPDATE
One approach that will work is this:
(But I'm somehow unsatisfied with this solution)
Create an Enum
to store the last Action in:
public enum ExpandActions
{
ExpandRight,
ExpandLeft,
CollapsRight,
CollapseLeft
}
Then I added the handlers for Expand
& Collapse
to my Expanders
in xaml.
At last override SizeChanged
on the Window as in WPF - Expand Window to the Left.
We only want this behavior, when expanding to left - otherwise we would kill our 'expand-to-right' behavior.
protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
{
if (!sizeInfo.WidthChanged)
{
base.OnRenderSizeChanged(sizeInfo);
return;
}
Hide();
base.OnRenderSizeChanged(sizeInfo);
//Last action was on left expander
if(_lastAction == ExpandActions.CollapseLeft || _lastAction == ExpandActions.ExpandLeft)
{
Left -= (sizeInfo.NewSize.Width - sizeInfo.PreviousSize.Width);
}
Show();
}
Good point about this is that expansion out of screen could be handled.
It works but I guess it's not the best solution.
The result is this: