/// <summary>
/// Select the given <see cref="Shape"/> and deselects all other <see cref="Shape"/>s.
/// </summary>
/// <param name="shape">The <see cref="Shape"/> to be selected.</param>
private void SingleSelect(Shape shape)
{
DeselectAll();
Canvas.RemoveShape(shape);
Canvas.AddShape(shape);
shape.IsSelected = true;
}
/// <summary>
/// Performs the mouse down event.
/// If mouse is pressed on any <see cref="Shape"/> on <see cref="Canvas"/>, then set this
/// <seealso cref="object"/> selected, otherwise, deselect all <see cref="Shape"/>s and
/// forms a <see cref="SelectedArea"/>.
/// </summary>
/// <remarks>Also updates the position of <see cref="_currentMousePoint"/>.</remarks>
/// <param name="sender">The <seealso cref="object"/> which triggers the event.</param>
/// <param name="e">The <seealso cref="EventArgs"/> containing information of mouse.</param>
/// <seealso cref="Mode.OnMouseDown"/>
public override void OnMouseDown(object sender, MouseEventArgs e)
{
_mousePressedPoint = new Point(e.X, e.Y);
_currentMousePoint = new Point(e.X, e.Y);
Shape = GetPressedShape(_currentMousePoint);
if (Shape != null)
{
if (!Shape.IsSelected)
{
SingleSelect(Shape);
}
}
else
{
//Mouse pressed on blank field: deselect all shapes
DeselectAll();
//Not a single shape selected: prepare to form a selection area.
Shape = new SelectedArea(e.X, e.Y);
Canvas.AddShape(Shape);
_hasSelectArea = true;
}
base.OnMouseDown(sender, e);
}
/// <summary>
/// Performs the mouse wheel event.
/// Adds the newly created <see cref="Shape"/> onto <see cref="Canvas"/>
/// for painting.
/// </summary>
/// <param name="sender">The <seealso cref="object"/> which triggers the event.</param>
/// <param name="e">The <seealso cref="EventArgs"/> containing information of mouse.</param>
/// <seealso cref="Mode.OnMouseDown"/>
public override void OnMouseDown(object sender, MouseEventArgs e)
{
Shape.SetLocation(e.X, e.Y);
Canvas.AddShape(Shape);
base.OnMouseDown(sender, e);
}
/// <summary>
/// Performs the mouse down event.
/// If mouse is clicking on a <see cref="BasicObject"/>, adds the newly created
/// <see cref="Line"/> onto <see cref="Canvas"/>, also adds a <see cref="Combination"/>
/// to source <see cref="BasicObject"/>. If mouse is not pressing on a <see cref="BasicObject"/>,
/// dispose the created <see cref="Line"/> object and do nothing.
/// </summary>
/// <param name="sender">The <seealso cref="object"/> which triggers the event.</param>
/// <param name="e">The <seealso cref="EventArgs"/> containing information of mouse.</param>
/// <seealso cref="Mode.OnMouseDown"/>
public override void OnMouseDown(object sender, MouseEventArgs e)
{
bool created = false;
Point mousePoint = new Point(e.X, e.Y);
for (int i = Canvas.GetShapeCount() - 1; i >= 0; i--)
{
Shape currentShape = Canvas.GetShape(i);
SourcePort = currentShape.GetNearestPort(mousePoint);
if (currentShape.IsCovers(mousePoint) && SourcePort != null)
{
Shape.SetPort(0, SourcePort); // Set source port to pressed object
SourcePort.Visible = true; // Set port to visible
TargetPort = new Port(e.X, e.Y);
Shape.SetPort(1, TargetPort); // Set destination port to the current position of mouse
Canvas.AddShape(Shape); // Add line to canvas
created = true;
SourceShape = currentShape;
break;
}
}
if (!created)
{
Shape = null;
}
base.OnMouseDown(sender, e);
}
public CanvasTest()
{
List <Line> lines = new List <Line>()
{
new Line(new Point(0, 0), new Point(6, 6)),
new Line(new Point(0, 6), new Point(6, 0))
};
canvas = new Canvas();
foreach (var line in lines)
{
canvas.AddShape(line);
}
}
/// <summary>
/// Selects all <see cref="Shape"/>s which are within the area covered by
/// the <see cref="SelectedArea"/>.
/// </summary>
/// <param name="selectedArea">The selection area.</param>
private void MultipleSelect(Shape selectedArea)
{
Point p1 = new Point(selectedArea.X, selectedArea.Y);
Point p2 = new Point(selectedArea.X + selectedArea.Width, selectedArea.X + selectedArea.Height);
foreach (Shape shape in Canvas.Shapes)
{
if (shape.IsWithin(p1, p2))
{
Canvas.RemoveShape(shape);
Canvas.AddShape(shape);
shape.IsSelected = true;
}
}
}
/// <summary>
/// Ungroup the given <see cref="Shape"/>s and extract the sub-<see cref="Shape"/>s
/// onto <see cref="Canvas"/> if the <see cref="Shape"/> is a <see cref="CompositionObject"/>.
/// </summary>
/// <param name="shapes">The <see cref="Shape"/>s to be ungrouped.</param>
private void UngroupShapes(Shape[] shapes)
{
foreach (Shape shape in shapes)
{
if (shape.Count > 1) // Then it is a composittion object.
{
Canvas.RemoveShape(shape);
while (shape.Count > 0)
{
Shape tempShape = shape.RemoveFirst();
tempShape.IsSelected = false;
Canvas.AddShape(tempShape);
}
}
}
}
/// <summary>
/// Triggers and performs the to-do action.
/// Groups all selected <see cref="Shape"/>s into a newly created
/// <see cref="CompositionObject"/>.
/// </summary>
/// <seealso cref="UMLAction.Trigger()"/>
public override void Trigger()
{
Shape[] selectedShapes = Canvas.SelectedShapes;
if (selectedShapes.Length < 2)
{
MessageBox.Show("Please select 2 or more object for grouping", "Warning", MessageBoxButtons.OK,
MessageBoxIcon.Warning);
return;
}
CompositionObject compositionObject = GroupShapes(selectedShapes);
Canvas.AddShape(compositionObject);
compositionObject.IsSelected = true;
Canvas.Invalidate();
base.Trigger();
}
/// <summary>
/// Ungroup the given <see cref="Shape"/>s and extract the sub-<see cref="Shape"/>s
/// onto <see cref="Canvas"/> if the <see cref="Shape"/> is a <see cref="CompositionObject"/>.
/// </summary>
/// <param name="shapes">The <see cref="Shape"/>s to be ungrouped.</param>
private void UngroupShapes(Shape[] shapes)
{
foreach (Shape shape in shapes)
{
if (shape.Count > 1) // Then it is a composittion object.
{
Canvas.RemoveShape(shape);
while (shape.Count > 0)
{
Shape tempShape = shape.RemoveFirst();
tempShape.IsSelected = false;
//09 / 14 修正在ungroup時object的port消失情形
tempShape.InitializePorts(tempShape.X, tempShape.Y);
Canvas.AddShape(tempShape);
}
}
}
}
