public override void AfterPaint(Graphics g)
{
g.TranslateTransform(_grac.Doc.PrintableBounds.X, _grac.Doc.PrintableBounds.Y);
// finally, mark the selected objects
if (SingleSelectedObject is IGrippableObject)
{
IGrippableObject gripObject = (IGrippableObject)SingleSelectedObject;
if (null != gripObject)
{
// first switch to the layer graphics context (from printable context)
SingleSelectedHitTestObject.ParentLayer.GraphToLayerCoordinates(g);
gripObject.ShowGrips(g);
}
}
else if (m_SelectedObjects.Count > 0)
{
foreach (IHitTestObject graphObject in m_SelectedObjects)
{
g.DrawPath(Pens.Blue, graphObject.SelectionPath);
}
}
base.AfterPaint(g);
}
/// <summary>
/// Handles the MouseDown event when the object pointer tool is selected
/// </summary>
/// <param name="e">The mouse event args</param>
/// <remarks>
/// The strategy to handle the mousedown event is as following:
///
/// Have we clicked on already selected objects?
/// if yes (we have clicked on already selected objects) and the shift or control key was pressed -> deselect the object and repaint
/// if yes (we have clicked on already selected objects) and none shift nor control key was pressed-> activate the object moving mode
/// if no (we have not clicked on already selected objects) and shift or control key was pressed -> search for the object and add it to the selected objects, then aktivate moving mode
/// if no (we have not clicked on already selected objects) and no shift or control key pressed -> if a object was found add it to the selected objects and activate moving mode
/// if no object was found clear the selection list, deactivate moving mode
/// </remarks>
public override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
{
base.OnMouseDown(e);
if (e.Button != MouseButtons.Left)
{
return; // then there is nothing to do here
}
// first, if we have a mousedown without shift key and the
// position has changed with respect to the last mousedown
// we have to deselect all objects
bool bControlKey = (Keys.Control == (Control.ModifierKeys & Keys.Control)); // Control pressed
bool bShiftKey = (Keys.Shift == (Control.ModifierKeys & Keys.Shift));
PointF mouseXY = new PointF(e.X, e.Y); // Mouse pixel coordinates
PointF graphXY = _grac.PixelToPrintableAreaCoordinates(mouseXY); // Graph area coordinates
// if we have exacly one object selected, and the one object is grippable,
// we hit test for the grip areas
if (SingleSelectedObject is IGrippableObject)
{
IGrippableObject gripObject = (IGrippableObject)SingleSelectedObject;
// first switch to the layer graphics context (from printable context)
PointF layerCoord = SingleSelectedHitTestObject.ParentLayer.GraphToLayerCoordinates(graphXY);
_grip.Handle = gripObject.GripHitTest(layerCoord);
if (_grip.Handle != null)
{
_grip.Layer = SingleSelectedHitTestObject.ParentLayer.Number;
_grip.Object = gripObject;
return; //
}
}
// have we clicked on one of the already selected objects
IHitTestObject clickedSelectedObject = null;
bool bClickedOnAlreadySelectedObjects = IsPixelPositionOnAlreadySelectedObject(mouseXY, out clickedSelectedObject);
if (bClickedOnAlreadySelectedObjects)
{
if (bShiftKey || bControlKey) // if shift or control is pressed, remove the selection
{
m_SelectedObjects.Remove(clickedSelectedObject);
_grac.RefreshGraph(); // repaint the graph
}
else // not shift or control pressed -> so activate the object moving mode
{
StartMovingObjects(mouseXY);
}
} // end if bClickedOnAlreadySelectedObjects
else // not clicked on a already selected object
{
// search for a object first
IHitTestObject clickedObject;
int clickedLayerNumber = 0;
_grac.FindGraphObjectAtPixelPosition(mouseXY, false, out clickedObject, out clickedLayerNumber);
if (bShiftKey || bControlKey) // if shift or control are pressed, we add the object to the selection list and start moving mode
{
if (null != clickedObject)
{
m_SelectedObjects.Add(clickedObject);
StartMovingObjects(mouseXY);
_grac.RepaintGraphArea();
}
}
else // no shift or control key pressed
{
if (null != clickedObject)
{
ClearSelections();
m_SelectedObjects.Add(clickedObject);
StartMovingObjects(mouseXY);
_grac.RepaintGraphArea();
}
else // if clicked to nothing
{
ClearSelections(); // clear the selection list
}
} // end else no shift or control
} // end else (not cklicked on already selected object)
} // end of function
