PowerPoint 不直接公开这些事件，但可以通过将全局鼠标挂钩与 PowerPoint 公开的形状参数相结合来实现您自己的事件。
这个答案涵盖了 MouseEnter 和 MouseLeave 的更困难的情况。要处理其他事件，例如 MouseDown 和 MouseUp，您可以使用提供的 PowerPoint 事件Application_WindowSelectionChange正如史蒂夫·林兹伯格提议的那样。
要获得全局鼠标钩子，您可以使用 ExcellentC# 中的应用程序和全局鼠标和键盘挂钩 .Net 库发现于http://globalmousekeyhook.codeplex.com/ http://globalmousekeyhook.codeplex.com/
您需要下载并引用该库，然后使用此代码设置鼠标挂钩
// Initialize the global mouse hook
_mouseHookManager = new MouseHookListener(new AppHooker());
_mouseHookManager.Enabled = true;
// Listen to the mouse move event
_mouseHookManager.MouseMove += MouseHookManager_MouseMove;
可以设置 MouseMove 事件来处理这样的鼠标事件（仅包含 MouseEnter 和 MouseLeave 的示例）
private List<PPShape> _shapesEntered = new List<PPShape>();
private List<PPShape> _shapesOnSlide = new List<PPShape>();
void MouseHookManager_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
// Temporary list holding active shapes (shapes with the mouse cursor within the shape)
List<PPShape> activeShapes = new List<PPShape>();
// Loop through all shapes on the slide, and add active shapes to the list
foreach (PPShapes in _shapesOnSlide)
{
if (MouseWithinShape(s, e))
{
activeShapes.Add(s);
}
}
// Handle shape MouseEnter events
// Select elements that are active but not currently in the shapesEntered list
foreach (PPShape s in activeShapes)
{
if (!_shapesEntered.Contains(s))
{
// Raise your custom MouseEntered event
s.OnMouseEntered();
// Add the shape to the shapesEntered list
_shapesEntered.Add(s);
}
}
// Handle shape MouseLeave events
// Remove elements that are in the shapes entered list, but no longer active
HashSet<long> activeIds = new HashSet<long>(activeShapes.Select(s => s.Id));
_shapesEntered.RemoveAll(s => {
if (!activeIds.Contains(s.Id)) {
// The mouse is no longer over the shape
// Raise your custom MouseLeave event
s.OnMouseLeave();
// Remove the shape
return true;
}
else
{
return false;
}
});
}
哪里的_shapesOnSlide是一个包含当前幻灯片上所有形状的列表，_shapesEntered是一个包含已输入但尚未离开的形状的列表，并且PPShape是 PowerPoint 形状的包装对象（如下所示）
MouseWithinShape 方法测试鼠标当前是否位于幻灯片上的形状内。它通过将形状的 X 和 Y 坐标（PowerPoint 以点为单位公开）转换为屏幕坐标，并测试鼠标是否位于该边界框内来实现此目的
/// <summary>
/// Test whether the mouse is within a shape
/// </summary>
/// <param name="shape">The shape to test</param>
/// <param name="e">MouseEventArgs</param>
/// <returns>TRUE if the mouse is within the bounding box of the shape; FALSE otherwise</returns>
private bool MouseWithinShape(PPShape shape, System.Windows.Forms.MouseEventArgs e)
{
// Fetch the bounding box of the shape
RectangleF shapeRect = shape.Rectangle;
// Transform to screen pixels
Rectangle shapeRectInScreenPixels = PointsToScreenPixels(shapeRect);
// Test whether the mouse is within the bounding box
return shapeRectInScreenPixels.Contains(e.Location);
}
/// <summary>
/// Transforms a RectangleF with PowerPoint points to a Rectangle with screen pixels
/// </summary>
/// <param name="shapeRectangle">The Rectangle in PowerPoint point-units</param>
/// <returns>A Rectangle in screen pixel units</returns>
private Rectangle PointsToScreenPixels(RectangleF shapeRectangle)
{
// Transform the points to screen pixels
int x1 = pointsToScreenPixelsX(shapeRectangle.X);
int y1 = pointsToScreenPixelsY(shapeRectangle.Y);
int x2 = pointsToScreenPixelsX(shapeRectangle.X + shapeRectangle.Width);
int y2 = pointsToScreenPixelsY(shapeRectangle.Y + shapeRectangle.Height);
// Expand the bounding box with a standard padding
// NOTE: PowerPoint transforms the mouse cursor when entering shapes before it actually
// enters the shape. To account for that, add this extra 'padding'
// Testing reveals that the current value (in PowerPoint 2013) is 6px
x1 -= 6;
x2 += 6;
y1 -= 6;
y2 += 6;
// Return the rectangle in screen pixel units
return new Rectangle(x1, y1, x2-x1, y2-y1);
}
/// <summary>
/// Transforms a PowerPoint point to screen pixels (in X-direction)
/// </summary>
/// <param name="point">The value of point to transform in PowerPoint point-units</param>
/// <returns>The screen position in screen pixel units</returns>
private int pointsToScreenPixelsX(float point)
{
// TODO Handle multiple windows
// NOTE: PresStatic is a reference to the PowerPoint presentation object
return PresStatic.Windows[1].PointsToScreenPixelsX(point);
}
/// <summary>
/// Transforms a PowerPoint point to screen pixels (in Y-direction)
/// </summary>
/// <param name="point">The value of point to transform in PowerPoint point-units</param>
/// <returns>The screen position in screen pixel units</returns>
private int pointsToScreenPixelsY(float point)
{
// TODO Handle multiple windows
// NOTE: PresStatic is a reference to the PowerPoint presentation object
return PresStatic.Windows[1].PointsToScreenPixelsY(point);
}
最后我们实现一个自定义的PPShape暴露我们想要监听的事件的对象
using System.Drawing;
using Microsoft.Office.Interop.PowerPoint;
using System;
namespace PowerPointDynamicLink.PPObject
{
class PPShape
{
#region Fields
protected Shape shape;
/// <summary>
/// Get the PowerPoint Shape this object is based on
/// </summary>
public Shape Shape
{
get { return shape; }
}
protected long id;
/// <summary>
/// Get or set the Id of the Shape
/// </summary>
public long Id
{
get { return id; }
set { id = value; }
}
protected string name;
/// <summary>
/// Get or set the name of the Shape
/// </summary>
public string Name
{
get { return name; }
set { name = value; }
}
/// <summary>
/// Gets the bounding box of the shape in PowerPoint Point-units
/// </summary>
public RectangleF Rectangle
{
get
{
RectangleF rect = new RectangleF
{
X = shape.Left,
Y = shape.Top,
Width = shape.Width,
Height = shape.Height
};
return rect;
}
}
#endregion
#region Constructor
/// <summary>
/// Creates a new PPShape object
/// </summary>
/// <param name="shape">The PowerPoint shape this object is based on</param>
public PPShape(Shape shape)
{
this.shape = shape;
this.name = shape.Name;
this.id = shape.Id;
}
#endregion
#region Event handling
#region MouseEntered
/// <summary>
/// An event that notifies listeners when the mouse has entered this shape
/// </summary>
public event EventHandler MouseEntered = delegate { };
/// <summary>
/// Raises an event telling listeners that the mouse has entered this shape
/// </summary>
internal void OnMouseEntered()
{
// Raise the event
MouseEntered(this, new EventArgs());
}
#endregion
#region MouseLeave
/// <summary>
/// An event that notifies listeners when the mouse has left this shape
/// </summary>
public event EventHandler MouseLeave = delegate { };
/// <summary>
/// Raises an event telling listeners that the mouse has left this shape
/// </summary>
internal void OnMouseLeave()
{
// Raise the event
MouseLeave(this, new EventArgs());
}
#endregion
#endregion
}
}
为了完全详尽，有多个需要处理的额外元素此处未涵盖。这包括诸如在 PowerPoint 窗口停用时暂停鼠标挂钩、处理多个 PowerPoint 窗口和多个屏幕等。
