Custom Wpf window, Windows window resizing function

Question

Gets a custom wpf window (WindowStyle = None, AllowTransparancy = true) and asks how to use the windows resize functions. You know when you click on a window and the mouse touches the left, right or top edge of the screen (even the corners in W10).

Tried to search WM notification , but none of them seem to be looking for what they are looking for.

To clear, not the usual window resizing .., but turning the edge of the screen and letting Windows resize it to half / full / quarter (think it's called Aero Snap). And I can do this with regular resizing calls, but it doesn’t show a transparent preview window or it discards the animation on the mouse when touching the edge.

thank

Answer 1

Step 1

Create a style (in <Window1.Resources>) for the rectangles as the capture area around the window:

<Style x:Key="RectBorderStyle" TargetType="Rectangle">
    <Setter Property="Focusable" Value="False" />
    <Setter Property="Fill" Value="Transparent" />
    <Setter Property="Tag" Value="{Binding RelativeSource={RelativeSource AncestorType=Window}}" />
    <EventSetter Event="MouseLeftButtonDown" Handler="Resize_Init"/>
    <EventSetter Event="MouseLeftButtonUp" Handler="Resize_End"/>
    <EventSetter Event="MouseMove" Handler="Resizeing_Form"/>
</Style>

Step 2

Add these stylized rectangles to your window. (You can add them inside a simple grid in your window)

<Rectangle x:Name="leftSizeGrip"
    Width="7"
    HorizontalAlignment="Left"
    Cursor="SizeWE"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle x:Name="rightSizeGrip"
    Width="7"
    HorizontalAlignment="Right"
    Cursor="SizeWE"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle x:Name="topSizeGrip"
    Height="7"
    VerticalAlignment="Top"
    Cursor="SizeNS"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle x:Name="bottomSizeGrip"
    Height="7"
    VerticalAlignment="Bottom"
    Cursor="SizeNS"
    Style="{StaticResource RectBorderStyle}" />
<!--  Corners  -->
<Rectangle Name="topLeftSizeGrip"
    Width="7"
    Height="7"
    HorizontalAlignment="Left"
    VerticalAlignment="Top"
    Cursor="SizeNWSE"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle Name="bottomRightSizeGrip"
    Width="7"
    Height="7"
    HorizontalAlignment="Right"
    VerticalAlignment="Bottom"
    Cursor="SizeNWSE"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle Name="topRightSizeGrip"
    Width="7"
    Height="7"
    HorizontalAlignment="Right"
    VerticalAlignment="Top"
    Cursor="SizeNESW"
    Style="{StaticResource RectBorderStyle}" />
<Rectangle Name="bottomLeftSizeGrip"
    Width="7"
    Height="7"
    HorizontalAlignment="Left"
    VerticalAlignment="Bottom"
    Cursor="SizeNESW"
    Style="{StaticResource RectBorderStyle}" />

Step 3

(window1.xaml.cs) ( MyStyle.xaml.cs, , 8 )

#region ResizeWindows
bool ResizeInProcess = false;
private void Resize_Init(object sender, MouseButtonEventArgs e)
{
    Rectangle senderRect = sender as Rectangle;
    if (senderRect != null)
    {
        ResizeInProcess = true;
        senderRect.CaptureMouse();
    }
}

private void Resize_End(object sender, MouseButtonEventArgs e)
{
    Rectangle senderRect = sender as Rectangle;
    if (senderRect != null)
    {
        ResizeInProcess = false; ;
        senderRect.ReleaseMouseCapture();
    }
}

private void Resizeing_Form(object sender, MouseEventArgs e)
{
    if (ResizeInProcess)
    {
        Rectangle senderRect = sender as Rectangle;
        Window mainWindow = senderRect.Tag as Window;
        if (senderRect != null)
        {
            double width = e.GetPosition(mainWindow).X;
            double height = e.GetPosition(mainWindow).Y;
            senderRect.CaptureMouse();
            if (senderRect.Name.ToLower().Contains("right"))
            {
                width += 5;
                if (width > 0)
                    mainWindow.Width = width;
            }
            if (senderRect.Name.ToLower().Contains("left"))
            {
                width -= 5;
                mainWindow.Left += width;
                width = mainWindow.Width - width;
                if (width > 0)
                {
                    mainWindow.Width = width;
                }
            }
            if (senderRect.Name.ToLower().Contains("bottom"))
            {
                height += 5;
                if (height > 0)
                    mainWindow.Height = height;
            }
            if (senderRect.Name.ToLower().Contains("top"))
            {
                height -= 5;
                mainWindow.Top += height;
                height = mainWindow.Height - height;
                if (height > 0)
                {
                    mainWindow.Height = height;
                }
            }
        }
    }
}
#endregion

4

F5 !

:

8 . , Fill Red, , .

:

. - WindowStateChanged .