/// <summary>
/// Initializes a new instance of the <see cref="DesktopElement"/> class.
/// </summary>
protected DesktopElement()
{
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.startMousePosition = new Point();
this.oldCanResize = this.CanResize;
}
private DragOrResizeStatus GetDragOrResizeMode(Point position)
{
DragOrResizeStatus status = DragOrResizeStatus.None;
if (this.CanDrag &&
this.partDragger != null &&
this.partDragger.IsMouseOver)
{
status = DragOrResizeStatus.Drag;
}
else if (this.CanResize)
{
if (position.X <= ResizeSideThichness) // left
{
status = this.GetLeftDragStatus(position);
}
else if (this.ActualWidth - position.X <= ResizeSideThichness) // right
{
status = this.GetRightDragStatus(position);
}
else if (position.Y <= ResizeSideThichness) // top
{
status = this.GetTopDragStatus(position);
}
else if (this.ActualHeight - position.Y <= ResizeSideThichness) // bottom
{
status = this.GetBottomDragStatus(position);
}
}
return(status);
}
private void CancelDragOrResize()
{
this.Cursor = null;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.ReleaseMouseCapture();
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.Input.Mouse.PreviewMouseMove"/> attached event
/// reaches an element in its route that is derived from this class.
/// Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">The <see cref="T:System.Windows.Input.MouseEventArgs"/> that contains the event data.</param>
protected override void OnPreviewMouseMove(MouseEventArgs e)
{
if (this.dragOrResizeStatus == DragOrResizeStatus.None)
{
// http://www.switchonthecode.com/tutorials/wpf-snippet-reliably-getting-the-mouse-position
Point point = e.GetPosition(this);
this.previewDragOrResizeStatus = this.GetDragOrResizeMode(point);
if (!this.CanResize &&
this.previewDragOrResizeStatus != DragOrResizeStatus.Drag &&
this.previewDragOrResizeStatus != DragOrResizeStatus.None)
{
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
}
this.SetResizeCursor(this.previewDragOrResizeStatus);
}
else if (this.IsMouseCaptured)
{
if (e.MouseDevice.LeftButton == MouseButtonState.Pressed)
{
// http://www.switchonthecode.com/tutorials/wpf-snippet-reliably-getting-the-mouse-position
Point point = e.GetPosition(this);
if (Math.Abs(point.X - this.previousMousePosition.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(point.Y - this.previousMousePosition.Y) > SystemParameters.MinimumVerticalDragDistance)
{
e.Handled = true;
this.AdjustBounds(point);
this.previousMousePosition = point;
}
}
else
{
this.CancelDragOrResize();
}
}
else
{
this.CancelDragOrResize();
}
base.OnPreviewMouseMove(e);
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.UIElement.PreviewMouseLeftButtonDown"/> routed event
/// reaches an element in its route that is derived from this class.
/// Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">
/// The <see cref="T:System.Windows.Input.MouseButtonEventArgs"/> that contains the event data.
/// The event data reports that the left mouse button was pressed.
/// </param>
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (!e.Handled &&
e.ClickCount == 1 &&
e.Source == this)
{
if (this.dragOrResizeStatus == DragOrResizeStatus.None &&
this.previewDragOrResizeStatus != DragOrResizeStatus.None)
{
e.Handled = true;
this.dragOrResizeStatus = this.previewDragOrResizeStatus;
this.startMousePosition = this.previousMousePosition = e.GetPosition(this);
this.CaptureMouse();
}
}
base.OnPreviewMouseLeftButtonDown(e);
}
private void SetResizeCursor(DragOrResizeStatus resizeStatus)
{
if (this.CanResize || this.CanDrag)
{
if (resizeStatus.IsDragging)
{
this.Cursor = null;
}
else if (resizeStatus.IsOnTopLeftOrBottomRight)
{
this.Cursor = Cursors.SizeNWSE;
}
else if (resizeStatus.IsOnTopRightOrBottomLeft)
{
this.Cursor = Cursors.SizeNESW;
}
else if (resizeStatus.IsOnTopRightOrBottomLeft)
{
this.Cursor = Cursors.SizeNESW;
}
else if (resizeStatus.IsOnTopCenterOrBottomCenter)
{
this.Cursor = Cursors.SizeNS;
}
else if (resizeStatus.IsOnMiddleLeftOrMiddleRight)
{
this.Cursor = Cursors.SizeWE;
}
else if (this.Cursor != null)
{
this.Cursor = null;
}
}
else if (this.Cursor != null)
{
this.Cursor = null;
}
}
/// <summary>
/// Closes the desktop element
/// </summary>
public virtual void Close()
{
if (this.Parent != null)
{
this.Parent.Children.Remove(this);
}
// Clean up
this.Id = Guid.Empty;
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.startMousePosition = new Point();
this.previousMousePosition = new Point();
this.oldPosition = new Point();
this.previousSize = Size.Empty;
this.originalSize = Size.Empty;
this.isInitialized = false;
this.oldCanResize = false;
this.partDragger = null;
this.parent = null;
this.Content = null;
this.DataContext = null;
}
private void SetResizeCursor(DragOrResizeStatus resizeStatus)
{
if (this.CanResize || this.CanDrag)
{
if (resizeStatus.IsDragging)
{
this.Cursor = null;
}
else if (resizeStatus.IsOnTopLeftOrBottomRight)
{
this.Cursor = Cursors.SizeNWSE;
}
else if (resizeStatus.IsOnTopRightOrBottomLeft)
{
this.Cursor = Cursors.SizeNESW;
}
else if (resizeStatus.IsOnTopRightOrBottomLeft)
{
this.Cursor = Cursors.SizeNESW;
}
else if (resizeStatus.IsOnTopCenterOrBottomCenter)
{
this.Cursor = Cursors.SizeNS;
}
else if (resizeStatus.IsOnMiddleLeftOrMiddleRight)
{
this.Cursor = Cursors.SizeWE;
}
else if (this.Cursor != null)
{
this.Cursor = null;
}
}
else if (this.Cursor != null)
{
this.Cursor = null;
}
}
private void CancelDragOrResize()
{
this.Cursor = null;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.ReleaseMouseCapture();
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.Input.Mouse.PreviewMouseMove"/> attached event
/// reaches an element in its route that is derived from this class.
/// Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">The <see cref="T:System.Windows.Input.MouseEventArgs"/> that contains the event data.</param>
protected override void OnPreviewMouseMove(MouseEventArgs e)
{
if (this.dragOrResizeStatus == DragOrResizeStatus.None)
{
// http://www.switchonthecode.com/tutorials/wpf-snippet-reliably-getting-the-mouse-position
Point point = e.GetPosition(this);
this.previewDragOrResizeStatus = this.GetDragOrResizeMode(point);
if (!this.CanResize
&& this.previewDragOrResizeStatus != DragOrResizeStatus.Drag
&& this.previewDragOrResizeStatus != DragOrResizeStatus.None)
{
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
}
this.SetResizeCursor(this.previewDragOrResizeStatus);
}
else if (this.IsMouseCaptured)
{
if (e.MouseDevice.LeftButton == MouseButtonState.Pressed)
{
// http://www.switchonthecode.com/tutorials/wpf-snippet-reliably-getting-the-mouse-position
Point point = e.GetPosition(this);
if (Math.Abs(point.X - this.previousMousePosition.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(point.Y - this.previousMousePosition.Y) > SystemParameters.MinimumVerticalDragDistance)
{
e.Handled = true;
this.AdjustBounds(point);
this.previousMousePosition = point;
}
}
else
{
this.CancelDragOrResize();
}
}
else
{
this.CancelDragOrResize();
}
base.OnPreviewMouseMove(e);
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.UIElement.PreviewMouseLeftButtonDown"/> routed event
/// reaches an element in its route that is derived from this class.
/// Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">
/// The <see cref="T:System.Windows.Input.MouseButtonEventArgs"/> that contains the event data.
/// The event data reports that the left mouse button was pressed.
/// </param>
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (!e.Handled
&& e.ClickCount == 1
&& e.Source == this)
{
if (this.dragOrResizeStatus == DragOrResizeStatus.None &&
this.previewDragOrResizeStatus != DragOrResizeStatus.None)
{
e.Handled = true;
this.dragOrResizeStatus = this.previewDragOrResizeStatus;
this.startMousePosition = this.previousMousePosition = e.GetPosition(this);
this.CaptureMouse();
}
}
base.OnPreviewMouseLeftButtonDown(e);
}
/// <summary>
/// Closes the desktop element
/// </summary>
public virtual void Close()
{
if (this.Parent != null)
{
this.Parent.Children.Remove(this);
}
// Clean up
this.Id = Guid.Empty;
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.startMousePosition = new Point();
this.previousMousePosition = new Point();
this.oldPosition = new Point();
this.previousSize = Size.Empty;
this.originalSize = Size.Empty;
this.isInitialized = false;
this.oldCanResize = false;
this.partDragger = null;
this.parent = null;
this.Content = null;
this.DataContext = null;
}
/// <summary>
/// Initializes a new instance of the <see cref="DesktopElement"/> class.
/// </summary>
protected DesktopElement()
{
this.previewDragOrResizeStatus = DragOrResizeStatus.None;
this.dragOrResizeStatus = DragOrResizeStatus.None;
this.startMousePosition = new Point();
this.oldCanResize = this.CanResize;
}
