我想用鼠标调整银色网格的大小，就像我们用鼠标调整窗口大小一样。 我实现了鼠标移动事件以执行所需的任务，但它允许从顶部，左侧和右侧调整大小。仅限网格的左上边缘，而不是其他大小。
以下是我实施的代码：
XAML代码（UI）
<Border Grid.Column="0" x:Name="LayoutRoot" BorderBrush="Transparent" Padding="0" CornerRadius="3" BorderThickness="0" >
<Border.Background>
<SolidColorBrush x:Name="LayoutBackground" Color="WhiteSmoke" Opacity=".5" />
</Border.Background>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" x:Name="Layout_TopLeftEdge" Opacity=".0" Cursor="SizeNWSE" CornerRadius="5" Height="5" Width="5" Background="LightGray" VerticalAlignment="Top" HorizontalAlignment="Left"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="TopLeftEdge">.</TextBlock>
</Border>
<Border Grid.Column="1" x:Name="Layout_TopEdge" Opacity=".0" Cursor="SizeNS" CornerRadius="5" Height="5" Background="LightGray"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="TopEdge">.</TextBlock>
</Border>
<Border Grid.Column="2" x:Name="Layout_TopRightEdge" Opacity=".0" Cursor="SizeNESW" CornerRadius="5" Height="5" Width="5" Background="LightGray" VerticalAlignment="Top" HorizontalAlignment="Right"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="TopRightEdge">.</TextBlock>
</Border>
</Grid>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" x:Name="Layout_LeftEdge" Opacity=".0" Cursor="SizeWE" CornerRadius="5" Width="5" Background="LightGray" VerticalAlignment="Stretch" HorizontalAlignment="Left"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="LeftEdge">.</TextBlock>
</Border>
<Border Grid.Column="1" x:Name="LayoutRootBorder" Style="{StaticResource GlassBorderStyle}" MouseLeftButtonDown="LayoutRoot_MouseLeftButtonDown" MouseLeftButtonUp="LayoutRoot_MouseLeftButtonUp" MouseMove="LayoutRoot_MouseMove">
<ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
<Grid x:Name="LegendGrid" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<!--<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />-->
</Grid.RowDefinitions>
<!--<TextBlock Grid.Row="1" Grid.ColumnSpan="2" Text="Legend" FontStyle="Normal" FontWeight="Bold" Margin="0" TextAlignment="Left" />-->
<!--<tree:TreeViewIcon Grid.Column="0" Style="{StaticResource IconStyle}"
IconType="Circle"
StrokeColor="Red"
StrokeThicknessPercent="20"
FillColor="LightGreen" />
<tree:TreeViewIcon Grid.Column="0" Grid.Row="1" Style="{StaticResource IconStyle}"
IconType="Rectangle"
StrokeColor="Blue"
StrokeThicknessPercent="20"
FillColor="Yellow" />
<TextBlock Grid.Column="1" Grid.Row="1" Text="Layer Name #2" Style="{StaticResource TokenTextStyle}" />-->
</Grid>
</ScrollViewer>
</Border>
<Border Grid.Column="2" x:Name="Layout_RightEdge" Opacity=".0" Cursor="SizeWE" CornerRadius="5" Width="5" Background="LightGray" VerticalAlignment="Stretch" HorizontalAlignment="Right"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="RightEdge">.</TextBlock>
</Border>
</Grid>
<Grid Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" x:Name="Layout_BottomLeftEdge" Opacity=".0" Cursor="SizeNESW" CornerRadius="5" Height="5" Width="5" Background="LightGray" VerticalAlignment="Bottom" HorizontalAlignment="Left"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="BottomLeftEdge">.</TextBlock>
</Border>
<Border Grid.Column="1" x:Name="Layout_BottomEdge" Opacity=".0" Cursor="SizeNS" CornerRadius="5" Height="5" Background="LightGray"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="BottomEdge">.</TextBlock>
</Border>
<Border Grid.Column="2" x:Name="Layout_BottomRightEdge" Opacity=".0" Cursor="SizeNWSE" CornerRadius="5" Height="5" Width="5" Background="LightGray" VerticalAlignment="Bottom" HorizontalAlignment="Right"
MouseLeftButtonDown="LayoutGrid_MouseLeftButtonDown" MouseLeftButtonUp="LayoutGrid_MouseLeftButtonUp" MouseMove="LayoutGrid_MouseMove">
<TextBlock x:Name="BottomRightEdge">.</TextBlock>
</Border>
</Grid>
</Grid>
</Border>
XAML.cs代码（代码隐藏）
bool IsMouseDown_LayoutGrid;
enum cornerEdge { None = 0, TopLeft = 1, TopRight = 2, BottomRight = 3, BottomLeft = 4, Top = 5, Right = 6, Bottom = 7, Left = 8 };
cornerEdge Edge = 0;
Point ResizeOffset;
private void LayoutGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
IsMouseDown_LayoutGrid = true;
ResizeOffset = e.GetPosition(OuterGrid);
switch ((e.OriginalSource as TextBlock).Name)
{
case "TopLeftEdge":
Edge = cornerEdge.TopLeft;
Layout_TopLeftEdge.CaptureMouse();
break;
case "TopEdge":
Edge = cornerEdge.Top;
Layout_TopEdge.CaptureMouse();
break;
case "TopRightEdge":
Edge = cornerEdge.TopRight;
Layout_TopRightEdge.CaptureMouse();
break;
case "LeftEdge":
Edge = cornerEdge.Left;
Layout_LeftEdge.CaptureMouse();
break;
case "RightEdge":
Edge = cornerEdge.Right;
Layout_RightEdge.CaptureMouse();
break;
case "BottomLeftEdge":
Edge = cornerEdge.BottomLeft;
Layout_BottomLeftEdge.CaptureMouse();
break;
case "BottomEdge":
Edge = cornerEdge.Bottom;
Layout_BottomEdge.CaptureMouse();
break;
case "BottomRightEdge":
Edge = cornerEdge.BottomRight;
Layout_BottomRightEdge.CaptureMouse();
break;
}
}
private void LayoutGrid_MouseMove(object sender, MouseEventArgs e)
{
if (IsMouseDown_LayoutGrid)
{
// we want to move it based on the position of the mouse
moveGridControl(e);
}
}
private void moveGridControl(MouseEventArgs e)
{
Point mousePos = e.GetPosition(OuterGrid);
Point diff = new Point(ResizeOffset.X - mousePos.X, ResizeOffset.Y - mousePos.Y);
if (double.IsNaN(OuterGrid.Width))
OuterGrid.Width = OuterGrid.MinWidth;
if (double.IsNaN(OuterGrid.Height))
OuterGrid.Height = OuterGrid.MinHeight;
if (Edge == cornerEdge.TopLeft)
{
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
}
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
}
}
else if (Edge == cornerEdge.Top)
{
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
}
}
else if (Edge == cornerEdge.TopRight)
{
//diff.X = -diff.X;
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
//MainTranslateTransform.X += (diff.X);
}
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
//MainTranslateTransform.Y += (diff.Y);
}
}
else if (Edge == cornerEdge.Left)
{
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
}
}
else if (Edge == cornerEdge.Right)
{
//diff.X = -diff.X;
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
}
}
else if (Edge == cornerEdge.BottomLeft)
{
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
}
//diff.Y = -diff.Y;
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
}
}
else if (Edge == cornerEdge.Bottom)
{
//diff.Y = -diff.Y;
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
}
}
else if (Edge == cornerEdge.BottomRight)
{
if ((OuterGrid.Width + diff.X) >= OuterGrid.MinWidth && (OuterGrid.Width + diff.X) <= OuterGrid.MaxWidth)
{
OuterGrid.Width += diff.X;
}
//diff.Y = -diff.Y;
if ((OuterGrid.Height + diff.Y) >= OuterGrid.MinHeight && (OuterGrid.Height + diff.Y) <= OuterGrid.MaxHeight)
{
OuterGrid.Height += diff.Y;
}
}
}
private void LayoutGrid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
IsMouseDown_LayoutGrid = false;
switch (Edge)
{
case cornerEdge.TopLeft:
Layout_TopLeftEdge.ReleaseMouseCapture();
break;
case cornerEdge.Top:
Layout_TopEdge.ReleaseMouseCapture();
break;
case cornerEdge.TopRight:
Layout_TopRightEdge.ReleaseMouseCapture();
break;
case cornerEdge.Left:
Layout_LeftEdge.ReleaseMouseCapture();
break;
case cornerEdge.Right:
Layout_RightEdge.ReleaseMouseCapture();
break;
case cornerEdge.BottomLeft:
Layout_BottomLeftEdge.ReleaseMouseCapture();
break;
case cornerEdge.Bottom:
Layout_BottomEdge.ReleaseMouseCapture();
break;
case cornerEdge.BottomRight:
Layout_BottomRightEdge.ReleaseMouseCapture();
break;
}
Edge = 0;
}