/// <summary>
/// Add new object to draw area.
/// Function is called when user left-clicks draw area,
/// and one of ToolObject-derived tools is active.
/// </summary>
/// <param name="drawArea"></param>
/// <param name="o"></param>
protected void AddNewObject(DrawArea drawArea, DrawObject o)
{
drawArea.GraphicsList.UnselectAll();
o.Selected = true;
drawArea.GraphicsList.Add(o);
drawArea.Capture = true;
drawArea.Refresh();
drawArea.SetDirty();
}
/// <summary>
/// Insert object to specified place.
/// Used for Undo.
/// </summary>
public void Insert(int index, DrawObject obj)
{
if ( index >= 0 && index < graphicsList.Count )
{
graphicsList.Insert(index, obj);
}
}
/// <summary>
/// Replace object in specified place.
/// Used for Undo.
/// </summary>
public void Replace(int index, DrawObject obj)
{
if (index >= 0 && index < graphicsList.Count)
{
graphicsList.RemoveAt(index);
graphicsList.Insert(index, obj);
}
}
public void Add(DrawObject obj)
{
// insert to the top of z-order
graphicsList.Insert(0, obj);
}
/// <summary>
/// Copy fields from this instance to cloned instance drawObject.
/// Called from Clone functions of derived classes.
/// </summary>
protected void FillDrawObjectFields(DrawObject drawObject)
{
drawObject.selected = this.selected;
drawObject.color = this.color;
drawObject.penWidth = this.penWidth;
drawObject.ID = this.ID;
}
// Create this command with DrawObject instance added to the list
public CommandAdd(DrawObject drawObject) : base()
{
// Keep copy of added object
this.drawObject = drawObject.Clone();
}
/// <summary>
/// Left mouse button is pressed
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
commandChangeState = null;
wasMove = false;
selectMode = SelectionMode.None;
Point point = new Point(e.X, e.Y);
// Test for resizing (only if control is selected, cursor is on the handle)
foreach (DrawObject o in drawArea.GraphicsList.Selection)
{
int handleNumber = o.HitTest(point);
if (handleNumber > 0)
{
selectMode = SelectionMode.Size;
// keep resized object in class member
resizedObject = o;
resizedObjectHandle = handleNumber;
// Since we want to resize only one object, unselect all other objects
drawArea.GraphicsList.UnselectAll();
o.Selected = true;
commandChangeState = new CommandChangeState(drawArea.GraphicsList);
break;
}
}
// Test for move (cursor is on the object)
if ( selectMode == SelectionMode.None )
{
int n1 = drawArea.GraphicsList.Count;
DrawObject o = null;
for ( int i = 0; i < n1; i++ )
{
if ( drawArea.GraphicsList[i].HitTest(point) == 0 )
{
o = drawArea.GraphicsList[i];
break;
}
}
if ( o != null )
{
selectMode = SelectionMode.Move;
// Unselect all if Ctrl is not pressed and clicked object is not selected yet
if ( ( Control.ModifierKeys & Keys.Control ) == 0 && !o.Selected )
drawArea.GraphicsList.UnselectAll();
// Select clicked object
o.Selected = true;
commandChangeState = new CommandChangeState(drawArea.GraphicsList);
drawArea.Cursor = Cursors.SizeAll;
}
}
// Net selection
if ( selectMode == SelectionMode.None )
{
// click on background
if ( ( Control.ModifierKeys & Keys.Control ) == 0 )
drawArea.GraphicsList.UnselectAll();
selectMode = SelectionMode.NetSelection;
}
lastPoint.X = e.X;
lastPoint.Y = e.Y;
startPoint.X = e.X;
startPoint.Y = e.Y;
drawArea.Capture = true;
drawArea.Refresh();
if ( selectMode == SelectionMode.NetSelection )
{
// Draw selection rectangle in initial position
ControlPaint.DrawReversibleFrame(
drawArea.RectangleToScreen(DrawRectangle.GetNormalizedRectangle(startPoint, lastPoint)),
Color.Black,
FrameStyle.Dashed);
}
}
/// <summary>
/// Right mouse button is released
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
{
if ( selectMode == SelectionMode.NetSelection )
{
// Remove old selection rectangle
ControlPaint.DrawReversibleFrame(
drawArea.RectangleToScreen(DrawRectangle.GetNormalizedRectangle(startPoint, lastPoint)),
Color.Black,
FrameStyle.Dashed);
// Make group selection
drawArea.GraphicsList.SelectInRectangle(
DrawRectangle.GetNormalizedRectangle(startPoint, lastPoint));
selectMode = SelectionMode.None;
}
if ( resizedObject != null )
{
// after resizing
resizedObject.Normalize();
resizedObject = null;
}
drawArea.Capture = false;
drawArea.Refresh();
if ( commandChangeState != null && wasMove )
{
// Keep state after moving/resizing and add command to history
commandChangeState.NewState(drawArea.GraphicsList);
drawArea.AddCommandToHistory(commandChangeState);
commandChangeState = null;
}
}