Class GridClickCellsMouseController

This MouseController handles mouse events for cell elements. In its HitTest method, the cell renderer for the cell under the mouse cursor is determined and based on the cell renderer's HitTest result, mouse events will be forwarded to that cell.

Inheritance

System.Object

NonFinalizeDisposable

GridSubComponent

GridMouseController

GridClickCellsMouseController

Implements

System.IDisposable

IMouseController

IGridFocusHelper

Inherited Members

GridMouseController.GetAllowFixFocus()

GridSubComponent.Grid

NonFinalizeDisposable.Dispose()

NonFinalizeDisposable.Dispose(Boolean)

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Syncfusion.Windows.Forms.Grid

Assembly: Syncfusion.Grid.Windows.dll

Syntax

public class GridClickCellsMouseController : GridMouseController, IDisposable, IMouseController, IGridFocusHelper

Remarks

This mouse controller manages the calls to each Cell Renderer's OnHitTest, OnMouseDown, OnMouseHover, OnMouseUp, OnMouseHoverEnter, OnMouseHoverLeave, and OnCancelMode methods. If a cell renderer's OnHitTest method returns a non-zero value, the cell renderer will receive mouse events associated with that cell.

If a cell has cell button elements and the mouse is over a cell button element, the cell button element will receive all mouse events associated with that cell button element.

If the user clicks on a cell button element, the cell button element will raise a Click event in its OnMouseUp event handler.

This MouseController is not used by the GridControl by default. Instead, all this functionality is provided by the GridSelectCellsMouseController. However, the grouping grid control uses this controller to forward events to cell renderers.

Examples

This example shows code samples from GroupDropAreaDragHeaderMouseController where the mouse events are forwarded to the GridClickCellsMouseController.

    public class GroupDropAreaDragHeaderMouseController : GroupDragHeaderMouseControllerBase
    {
        public GroupDropAreaDragHeaderMouseController(GridGroupDropArea grid)
        {
            this.groupDropArea = grid;
            isGroupAreaOrigin = true;
            clickCellsController = new GridClickCellsMouseController(grid);
        }

        internal GridClickCellsMouseController clickCellsController;
        int clickCellsControllerHitTest = 0;
 
        public GridClickCellsMouseController ClickCellsController
        {
            get
            {
                return clickCellsController;
            }
        }

       public void ResetClickCellsController()
       {
           if (this.entered)
               clickCellsController.MouseHoverLeave(EventArgs.Empty);
           else if (clickCellsControllerHitTest != 0)
               clickCellsController.CancelMode();
           entered = false;
           clickCellsControllerHitTest = 0;
       }

          // unrelated code left out here ...

       #region IMouseController implementation

       public virtual string Name
       {
           get
           {
               return "DragGroupHeader";
           }
       }
 
        public virtual Cursor Cursor
        {
            get
            {
                if (cursor != null)
                    return cursor;
                return clickCellsController.Cursor;
            }
        }

       bool entered = false;

       public virtual void MouseHoverEnter()
       {
           if (clickCellsControllerHitTest != 0)
           {
               entered = true;
               clickCellsController.MouseHoverEnter();
           }
       }
 
        public virtual void MouseHover(MouseEventArgs e)
        {
            if (clickCellsControllerHitTest != 0)
                clickCellsController.MouseHover(e);
        }
 
        public virtual void MouseHoverLeave(EventArgs e)
        {
            if (entered)
            {
                clickCellsController.MouseHoverLeave(e);
                entered = false;
            }
        }

       public virtual void MouseDown(MouseEventArgs e)
       {
           if (clickCellsControllerHitTest != 0)
               clickCellsController.MouseDown(e);
       }
 
        public virtual void MouseMove(MouseEventArgs e)
        {
            if (clickCellsControllerHitTest != 0)
                clickCellsController.MouseMove(e);
        }
 
        public virtual void MouseUp(MouseEventArgs e)
        {
            if (clickCellsControllerHitTest != 0)
                clickCellsController.MouseUp(e);
        }

       public virtual void CancelMode()
       {
           if (clickCellsControllerHitTest != 0)
               clickCellsController.CancelMode();
       }

       public virtual int HitTest(MouseEventArgs e, IMouseController controller)
       {
           clickCellsControllerHitTest = clickCellsController.HitTest(e, controller);
           return clickCellsControllerHitTest;
       }
 
        #endregion
       }

Constructors

GridClickCellsMouseController(GridControlBase)

Initializes a new instance forGridClickCellsMouseController class.

Declaration

public GridClickCellsMouseController(GridControlBase grid)

Parameters

Type	Name	Description
GridControlBase	grid	The parent grid.

Properties

Cursor

The cursor to be displayed.

Declaration

public override Cursor Cursor { get; }

Property Value

Type
System.Windows.Forms.Cursor

Overrides

GridMouseController.Cursor

Name

The name of this mouse controller.

Declaration

public override string Name { get; }

Property Value

Type
System.String

Overrides

GridMouseController.Name

Methods

CancelMode()

Occurs when the current mouse operation is cancelled.

Declaration

public override void CancelMode()

Overrides

GridMouseController.CancelMode()

HitTest(MouseEventArgs, IMouseController)

HitTest is called to determine whether your controller wants to handle the mouse events based current context.

Declaration

public override int HitTest(MouseEventArgs e, IMouseController controller)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	A MouseEventArgs holding event data.
IMouseController	controller	A mouse controller.

Returns

Type	Description
System.Int32	A non-zero value if the controller can and wants to handle the mouse event; 0 otherwise.

Overrides

GridMouseController.HitTest(MouseEventArgs, IMouseController)

Remarks

The current winner of the vote is specified through the controller parameter. Your implementation of HitTest can decide if it wants to override the existing vote or leave it.

MouseDown(MouseEventArgs)

MouseDown is called when this controller signaled in HitTest that it wants to handle mouse events and the user pressed the mouse button.

Declaration

public override void MouseDown(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.EventArgsthat contains event data.

Overrides

GridMouseController.MouseDown(MouseEventArgs)

Remarks

MouseDown is called and this controller will become the active controller and receive all subsequent mouse message until the mouse button is released or the mouse operation is cancelled.

MouseHover(MouseEventArgs)

MouseHover is called when this controller signaled in HitTest that it wants to handle mouse events. MouseHover is called after MouseHoverEnter.

Declaration

public override void MouseHover(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.Windows.Forms.MouseEventArgsthat contains event data.

Overrides

GridMouseController.MouseHover(MouseEventArgs)

MouseHoverEnter()

MouseHoverEnter is called when this controller signaled in HitTest that it wants to handle mouse events. MouseHoverEnter is called before the first time MouseHover is called.

Declaration

public override void MouseHoverEnter()

Overrides

GridMouseController.MouseHoverEnter()

MouseHoverLeave(EventArgs)

MouseHoverLeave is called when hovering ends either because user dragged mouse out of the hit-test area or when context changes (e.g. user pressed the mouse button).

Declaration

public override void MouseHoverLeave(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	The System.EventArgsthat contains event data.

Overrides

GridMouseController.MouseHoverLeave(EventArgs)

MouseMove(MouseEventArgs)

MouseMove is called for the active controller after a MouseDown message when the user moves the mouse pointer.

Declaration

public override void MouseMove(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.EventArgsthat contains event data.

Overrides

GridMouseController.MouseMove(MouseEventArgs)

MouseUp(MouseEventArgs)

MouseUp is called for the active controller after a MouseDown message when the user releases the mouse button.

Declaration

public override void MouseUp(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The System.EventArgsthat contains event data.

Overrides

GridMouseController.MouseUp(MouseEventArgs)

Implements

System.IDisposable

IMouseController

IGridFocusHelper