public override void Redo(DrawArea drawArea)
{
// Delete from list all objects kept in cloneList
int n = drawArea.Count;
for (int i = n - 1; i >= 0; i--)
{
bool toDelete = false;
DrawObject objectToDelete = drawArea[i];
foreach (DrawObject o in cloneList)
{
if (objectToDelete.ID == o.ID)
{
toDelete = true;
break;
}
}
if (toDelete)
{
drawArea.RemoveAt(i);
}
}
}
public DrawArea OpenFile()
{
var drawArea = new DrawArea(this);
var doc = tabbedView.AddDocument(drawArea);
doc.Caption = "测试";
this.tabbedView.ActivateDocument(drawArea);
return drawArea;
}
public override void Undo(DrawArea drawArea)
{
// Add all objects from clone list to list -
// opposite to DeleteAll
foreach (DrawObject o in cloneList)
{
drawArea.Add(o);
}
}
// Fill list from selection
private void FillList(DrawArea drawArea, ref List<DrawObject> listToFill)
{
listToFill = new List<DrawObject>();
foreach (DrawObject o in drawArea.Selection)
{
listToFill.Add(o.Clone());
}
}
/// <summary>
/// Left mouse is released.
/// New object is created and resized.
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
{
drawArea[0].Normalize();
drawArea.AddCommandToHistory(new CommandAdd(drawArea[0]));
drawArea.ActiveDrawTool = DrawToolType.Pointer;
drawArea.Capture = false;
drawArea.Refresh();
}
public override void Undo(DrawArea drawArea)
{
drawArea.UnselectAll();
// Add all objects from cloneList to list.
foreach (DrawObject o in cloneList)
{
drawArea.Add(o);
}
}
List<DrawObject> cloneList; // contains selected items which are deleted
// Create this command BEFORE applying Delete All function.
public CommandDelete(DrawArea drawArea)
{
cloneList = new List<DrawObject>();
// Make clone of the list selection.
foreach (DrawObject o in drawArea.Selection)
{
cloneList.Add(o.Clone());
}
}
public override void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
{
drawArea.Cursor = Cursor;
//if (e.Button == MouseButtons.Left)
//{
// Point point = new Point(e.X, e.Y);
// drawArea[0].MoveHandleTo(point, 5);
// drawArea.Refresh();
//}
}
/// <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.UnselectAll();
o.Selected = true;
drawArea.Add(o);
drawArea.Capture = true;
drawArea.Refresh();
drawArea.SetDirty();
}
// Create this command BEFORE applying Delete All function.
public CommandDeleteAll(DrawArea drawArea)
{
cloneList = new List<DrawObject>();
// Make clone of the whole list.
// Add objects in reverse order because GraphicsList.Add
// insert every object to the beginning.
int n = drawArea.Count;
for (int i = n - 1; i >= 0; i--)
{
cloneList.Add(drawArea[i].Clone());
}
}
public static DrawObject GetHitDrawObject(DrawArea drawArea, Point p)
{
var point = ToolObject.TranslatePoint(drawArea, p);
point = ToolObject.UnzoomPoint(point, drawArea.Zoom);
for (int i = 0; i < drawArea.Count; i++)
{
int n = drawArea[i].HitTest(point);
//TODO:///
//if (n >= 0 && !(drawArea[i] is DrawLine))
//{
// return drawArea[i];
//}
}
return null;
}
private static Point CalcScrollPoint(Point p, DrawArea drawArea)
{
var pt = new Point(p.X, p.Y);
if (pt.X < drawArea.Left)
pt.X = drawArea.Left;
if (pt.Y < drawArea.Top)
pt.Y = drawArea.Top;
if (pt.X > drawArea.Left + drawArea.Width - drawArea.AutoScrollPosition.X - 5)
pt.X = drawArea.Left + drawArea.Width - drawArea.AutoScrollPosition.X - 5;
if (pt.Y > drawArea.Top + drawArea.Height - drawArea.AutoScrollPosition.Y - 5)
pt.Y = drawArea.Top + drawArea.Height - drawArea.AutoScrollPosition.Y - 5;
return pt;
}
// Replace objects in graphicsList with objects from list
private void ReplaceObjects(DrawArea drawArea, List<DrawObject> list)
{
for ( int i = 0; i < drawArea.Count; i++ )
{
DrawObject replacement = null;
foreach(DrawObject o in list)
{
if ( o.ID == drawArea[i].ID )
{
replacement = o;
break;
}
}
if ( replacement != null )
{
drawArea.Replace(i, replacement);
}
}
}
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
AddNewObject(drawArea, new DrawRhombus(e.X, e.Y, 1, 1));
}
// Call this function AFTER operation.
public void NewState(DrawArea drawArea)
{
// Keep objects state after operation.
FillList(drawArea, ref listAfter);
}
public override void Undo(DrawArea drawArea)
{
// Replace all objects in the list with objects from listBefore
ReplaceObjects(drawArea, listBefore);
}
public override void Redo(DrawArea drawArea)
{
// Clear list - make DeleteAll again
drawArea.Clear();
}
public override void Redo(DrawArea drawArea)
{
// Replace all objects in the list with objects from listAfter
ReplaceObjects(drawArea, listAfter);
}
/// <summary>
/// Mouse is moved.
/// None button is pressed, or left button is pressed.
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
{
Point point = new Point(e.X, e.Y);
Point oldPoint = lastPoint;
wasMove = true;
// set cursor when mouse button is not pressed
if (e.Button == MouseButtons.None)
{
Cursor cursor = null;
for (int i = 0; i < drawArea.Count; i++)
{
int n = drawArea[i].HitTest(point);
if (n > 0)
{
cursor = drawArea[i].GetHandleCursor(n);
break;
}
}
if (cursor == null)
cursor = Cursors.Default;
drawArea.Cursor = cursor;
return;
}
if (e.Button != MouseButtons.Left)
return;
/// Left button is pressed
// Find difference between previous and current position
int dx = e.X - lastPoint.X;
int dy = e.Y - lastPoint.Y;
lastPoint.X = e.X;
lastPoint.Y = e.Y;
// resize
if (selectMode == SelectionMode.Size)
{
if (resizedObject != null)
{
resizedObject.MoveHandleTo(point, resizedObjectHandle);
drawArea.SetDirty();
drawArea.Refresh();
}
}
// move
if (selectMode == SelectionMode.Move)
{
foreach (DrawObject o in drawArea.Selection)
{
o.Move(dx, dy);
}
drawArea.Cursor = Cursors.SizeAll;
drawArea.SetDirty();
drawArea.Refresh();
}
if (selectMode == SelectionMode.NetSelection)
{
// Remove old selection rectangle
ControlPaint.DrawReversibleFrame(
drawArea.RectangleToScreen(DrawRectangle.GetNormalizedRectangle(startPoint, oldPoint)),
Color.Black,
FrameStyle.Dashed);
// Draw new selection rectangle
ControlPaint.DrawReversibleFrame(
drawArea.RectangleToScreen(DrawRectangle.GetNormalizedRectangle(startPoint, point)),
Color.Black,
FrameStyle.Dashed);
return;
}
}
/// <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.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.UnselectAll();
o.Selected = true;
commandChangeState = new CommandChangeState(drawArea);
break;
}
}
// Test for move (cursor is on the object)
if (selectMode == SelectionMode.None)
{
int n1 = drawArea.Count;
DrawObject o = null;
for (int i = 0; i < n1; i++)
{
if (drawArea[i].HitTest(point) == 0)
{
o = drawArea[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.UnselectAll();
// Select clicked object
o.Selected = true;
commandChangeState = new CommandChangeState(drawArea);
drawArea.Cursor = Cursors.SizeAll;
}
}
// Net selection
if (selectMode == SelectionMode.None)
{
// click on background
if ((Control.ModifierKeys & Keys.Control) == 0)
drawArea.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.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);
drawArea.AddCommandToHistory(commandChangeState);
commandChangeState = null;
}
}
// This function is used to make Undo operation. // It makes action opposite to the original command. public abstract void Undo(DrawArea drawArea);
// This command is used to make Redo operation. // It makes original command again. public abstract void Redo(DrawArea drawArea);
public override void Redo(DrawArea drawArea)
{
drawArea.UnselectAll();
drawArea.Add(drawObject);
}
// Create this command BEFORE operation.
public CommandChangeState(DrawArea drawArea)
{
// Keep objects state before operation.
FillList(drawArea, ref listBefore);
}
public static Point TranslatePoint(DrawArea drawArea, Point p)
{
var point = new Point(p.X + Math.Abs(drawArea.AutoScrollPosition.X), p.Y + Math.Abs(drawArea.AutoScrollPosition.Y));
return
CalcScrollPoint(point, drawArea);
}
public UndoManager(DrawArea drawArea)
{
this.drawArea = drawArea;
ClearHistory();
}
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
AddNewObject(drawArea, new DrawRectangle(true, e.X, e.Y, 1, 1));
}
public override void Undo(DrawArea drawArea)
{
drawArea.DeleteLastAddedObject();
}
/// <summary>
/// Left mouse button is released
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public virtual void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
{
}