/// <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>
/// Get properties from selected objects and fill GraphicsProperties instance
/// </summary>
/// <returns></returns>
private GraphicsProperties GetProperties()
{
GraphicsProperties properties = new GraphicsProperties();
int n = SelectionCount;
if (n < 1)
{
return(properties);
}
DrawObject o = GetSelectedObject(0);
int firstColor = o.Color.ToArgb();
int firstPenWidth = o.PenWidth;
bool allColorsAreEqual = true;
bool allWidthAreEqual = true;
for (int i = 1; i < n; i++)
{
if (GetSelectedObject(i).Color.ToArgb() != firstColor)
{
allColorsAreEqual = false;
}
if (GetSelectedObject(i).PenWidth != firstPenWidth)
{
allWidthAreEqual = false;
}
}
if (allColorsAreEqual)
{
properties.ColorDefined = true;
properties.Color = Color.FromArgb(firstColor);
}
if (allWidthAreEqual)
{
properties.PenWidthDefined = true;
properties.PenWidth = firstPenWidth;
}
return(properties);
}
/// <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)
{
// Group selection
drawArea.GraphicsList.SelectInRectangle(drawArea.NetRectangle);
selectMode = SelectionMode.None;
drawArea.DrawNetRectangle = false;
}
if (resizedObject != null)
{
// after resizing
resizedObject.Normalize();
resizedObject = null;
}
drawArea.Capture = false;
drawArea.Refresh();
}
public void Add(DrawObject obj)
{
// insert to the top of z-order
graphicsList.Insert(0, obj);
}
/// <summary>
/// Left mouse button is pressed
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
selectMode = SelectionMode.None;
Point point = new Point(e.X, e.Y);
// Test for resizing (only if control is selected, cursor is on the handle)
int n = drawArea.GraphicsList.SelectionCount;
for (int i = 0; i < n; i++)
{
DrawObject o = drawArea.GraphicsList.GetSelectedObject(i);
int handleNumber = o.HitTest(point);
if (handleNumber > 0)
{
selectMode = SelectionMode.Size;
// keep resized object in class members
resizedObject = o;
resizedObjectHandle = handleNumber;
// Since we want to resize only one object, unselect all other objects
drawArea.GraphicsList.UnselectAll();
o.Selected = true;
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;
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;
drawArea.DrawNetRectangle = true;
}
lastPoint.X = e.X;
lastPoint.Y = e.Y;
startPoint.X = e.X;
startPoint.Y = e.Y;
drawArea.Capture = true;
drawArea.NetRectangle = DrawRectangle.GetNormalizedRectangle(startPoint, lastPoint);
drawArea.Refresh();
}
/// <summary>
/// Right-click handler
/// </summary>
/// <param name="e"></param>
private void OnContextMenu(MouseEventArgs e)
{
return;
// Change current selection if necessary
Point point = new Point(e.X, e.Y);
int n = GraphicsList.Count;
DrawObject o = null;
for (int i = 0; i < n; i++)
{
if (GraphicsList[i].HitTest(point) == 0)
{
o = GraphicsList[i];
break;
}
}
if (o != null)
{
if (!o.Selected)
{
GraphicsList.UnselectAll();
}
// Select clicked object
o.Selected = true;
}
else
{
GraphicsList.UnselectAll();
}
Refresh();
// Show context menu.
// Make ugly trick which saves a lot of code.
// Get menu items from Edit menu in main form and
// make context menu from them.
// These menu items are handled in the parent form without
// any additional efforts.
MainMenu mainMenu = Owner.Menu; // Main menu
MenuItem editItem = mainMenu.MenuItems[1]; // Edit submenu
// Make array of items for ContextMenu constructor
// taking them from the Edit submenu
MenuItem[] items = new MenuItem[editItem.MenuItems.Count];
for (int i = 0; i < editItem.MenuItems.Count; i++)
{
items[i] = editItem.MenuItems[i];
}
//Owner.SetStateOfControls(); // enable/disable menu items//设置菜单的选种状态
// Create and show context menu
ContextMenu menu = new ContextMenu(items);
menu.Show(this, point);
// Restore items in the Edit menu (without this line Edit menu
// is empty after forst right-click)
editItem.MergeMenu(menu);
}