I'm trying to do a Window with a transparent square inside it, and I want to allow the user to re-size it in whatever way s/he wants. This code is working for vertical and horizontal re-size
<Window x:Class="TransparentWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="PloofTAS" Height="355" Width="539" Topmost="True"
ResizeMode="NoResize"
AllowsTransparency="True"
Background="Transparent"
WindowStyle="None" MouseLeftButtonDown="Window_MouseLeftButtonDown">
<Grid Name="GlobalGrid">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="8" />
<RowDefinition Height="*" />
<RowDefinition Height="8" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="8" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="8" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Rectangle Fill="Gray" Grid.Column="0" Grid.RowSpan="5" />
<Rectangle Fill="Gray" Grid.Column="4" Grid.RowSpan="5" />
<Rectangle Fill="Gray" Grid.Column="1" Grid.Row="0" Grid.ColumnSpan="3" />
<Rectangle Fill="Gray" Grid.Column="1" Grid.Row="4" Grid.ColumnSpan="3" />
<GridSplitter Grid.Column="2" Grid.Row="1" Height="Auto" HorizontalAlignment="Stretch" />
<GridSplitter Grid.Column="1" Grid.Row="2" Height="Auto" HorizontalAlignment="Stretch" />
<GridSplitter Grid.Column="3" Grid.Row="2" Height="Auto" HorizontalAlignment="Stretch" />
<GridSplitter Grid.Column="2" Grid.Row="3" Height="Auto" HorizontalAlignment="Stretch" />
<Rectangle Fill="Orange" Grid.Row="1" Grid.Column="1" />
<Rectangle Fill="Orange" Grid.Row="1" Grid.Column="3" />
<Rectangle Fill="Orange" Grid.Row="3" Grid.Column="1" />
<Rectangle Fill="Orange" Grid.Row="3" Grid.Column="3" />
<Rectangle Fill="Transparent" Stroke="Red" Grid.Column="2" Grid.Row="2"/>
</Grid>
</Window>
Here is the resulting window
I'd like for the orange squares (the corners of the red/transparent square) to be able to work diagonally, or both vertical and horizontal. Is it possible?
I don't know elegant solution for this problem as GridSplitter is not possible to set up programmatically.
My solution is just dirty mouse capture and set Column and Row measures according to mouse movement.
Set style and events. Tag property store index of a row and column we gonna to change in code behind.
Simple mouse capture events:
Resize grid columns and rows according to value stored in rectangle.Tag property. For correct behavior was needed to change opposite column and row measures too.
GridPosition is structure that stores column and row index values.